Merge pull request 'vaksman_valeria_lab_4' (#57) from vaksman_valeria_lab_4 into main

Reviewed-on: #57

vaksman_valeria_lab_4/Consumer_1.py

@@ -0,0 +1,27 @@
+import pika
+import time
+
+def callback(ch, method, properties, body):
+    print(f'Consumer 1 получил сообщение: {body.decode()}')
+
+    # Время задержки по условию
+    time.sleep(2)  
+    
+    print('Consumer 1 закончил обработку')
+
+def consume_events_1():
+    connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
+    channel = connection.channel()
+    
+    # Создание очереди
+    channel.queue_declare(queue='consumer1_queue')  
+    # Привязка очереди
+    channel.queue_bind(exchange='beauty_salon_events', queue='consumer1_queue')  
+
+    channel.basic_consume(queue='consumer1_queue', on_message_callback=callback, auto_ack=True)
+
+    print('Consumer 1 начал ожидать сообщения...')
+    channel.start_consuming()
+
+if __name__ == "__main__":
+    consume_events_1()

vaksman_valeria_lab_4/Consumer_2.py

@@ -0,0 +1,25 @@
+import pika
+
+def callback(ch, method, properties, body):
+    print(f'Consumer 2 получил сообщение: {body.decode()}')
+
+    # Обработка "нон-стопом"
+    print('Consumer 2 закончил обработку')
+
+def consume_events_2():
+    connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
+    channel = connection.channel()
+    
+    # Создание очереди
+    channel.queue_declare(queue='consumer2_queue') 
+
+    # Привязка очереди
+    channel.queue_bind(exchange='beauty_salon_events', queue='consumer2_queue')  
+
+    channel.basic_consume(queue='consumer2_queue', on_message_callback=callback, auto_ack=True)
+
+    print('Consumer 2 начал ожидать сообщения...')
+    channel.start_consuming()
+
+if __name__ == "__main__":
+    consume_events_2()

vaksman_valeria_lab_4/Publisher.py

@@ -0,0 +1,26 @@
+import pika
+import time
+
+def publish_events():
+    connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
+    channel = connection.channel()
+    
+    # Создание exchange типа fanout
+    channel.exchange_declare(exchange='beauty_salon_events', exchange_type='fanout')
+
+    events = [
+        "Пришёл заказ на услуги",
+        "Сообщение от пользователя",
+        "Необходимо создать отчёт",
+        "Запись на процедуру",
+        "Пользователь отменил запись"
+    ]
+
+    while True:
+        event = events[int(time.time()) % len(events)]
+        channel.basic_publish(exchange='beauty_salon_events', routing_key='', body=event)
+        print(f'Отправлено: {event}')
+        time.sleep(1)
+
+if __name__ == "__main__":
+    publish_events()

vaksman_valeria_lab_4/README.md

@@ -0,0 +1,60 @@
+# Лабораторная работа №4 - Работа с брокером сообщений
+
+## Задание
+
+#### Цель: 
+
+Изучение проектирования приложений при помощи брокера сообщений.
+
+#### Задачи:
+
+* Установить брокер сообщений RabbitMQ.
+* Пройти уроки 1, 2 и 3 из RabbitMQ Tutorials на любом языке программирования.
+* Продемонстрировать работу брокера сообщений.
+
+### Классы:
+ 1. ```Publisher``` - класс, отвечающий за отправку сообщений
+
+ 2. ```Consumer1``` - класс, отвечающий за принятие и обработку сообщений за задержкой 3 секунды
+
+ 2. ```Consumer2``` - класс, отвечающий за принятие и обработку сообщений без задержек
+
+#### Ход работы:
+ 
+На компьютер был установлен брокер сообщений ```RabbitMQ```, после чего все три класса программы были одновременно запущены.
+
+## Работа программы:
+
+Класс ```Publisher``` успешно осуществляет отправку сообщений своим клиентам.
+
+Класс ```Consumer1``` осуществляет принятие и обработку сообщений с задержкой в 3 секунды, это можно заметить на видео.
+
+Класс ```Consumer2``` мгновенно осуществляет принятие и обработку сообщений.
+
+## Работа с RabbitMQ Management UI
+
+![](Rabbit.png "")
+
+### Очередь ```Consumer1```
+
+![](consumer1.png "")
+
+### Очередь ```Consumer2```
+
+![](consumer2.png "")
+![](consumer2_2.png "")
+![](consumer3-1.png "")
+
+#### Уроки
+
+Урок 1:
+![](lesson1.png "")
+
+Урок 2:
+![](lesson2.png "")
+
+Урок 3:
+![](lesson3.png "")
+
+# ВК
+https://vk.com/video256017065_456239872

vaksman_valeria_lab_4/lesson_1/receive.py

@@ -0,0 +1,25 @@
+import pika, sys, os
+
+def main():
+    connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
+    channel = connection.channel()
+
+    channel.queue_declare(queue='hello')
+
+    def callback(ch, method, properties, body):
+        print(f" [x] Received {body}")
+
+    channel.basic_consume(queue='hello', on_message_callback=callback, auto_ack=True)
+
+    print(' [*] Waiting for messages. To exit press CTRL+C')
+    channel.start_consuming()
+
+if __name__ == '__main__':
+    try:
+        main()
+    except KeyboardInterrupt:
+        print('Interrupted')
+        try:
+            sys.exit(0)
+        except SystemExit:
+            os._exit(0)

vaksman_valeria_lab_4/lesson_1/send.py

@@ -0,0 +1,11 @@
+import pika
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters(host='localhost'))
+channel = connection.channel()
+
+channel.queue_declare(queue='hello')
+
+channel.basic_publish(exchange='', routing_key='hello', body='Hello World!')
+print(" [x] Sent 'Hello World!'")
+connection.close()

vaksman_valeria_lab_4/lesson_2/new_task.py

@@ -0,0 +1,19 @@
+import pika
+import sys
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters(host='localhost'))
+channel = connection.channel()
+
+channel.queue_declare(queue='task_queue', durable=True)
+
+message = ' '.join(sys.argv[1:]) or "Hello World!"
+channel.basic_publish(
+    exchange='',
+    routing_key='task_queue',
+    body=message,
+    properties=pika.BasicProperties(
+        delivery_mode=pika.DeliveryMode.Persistent
+    ))
+print(f" [x] Sent {message}")
+connection.close()

vaksman_valeria_lab_4/lesson_2/worker.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+import pika
+import time
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters(host='localhost'))
+channel = connection.channel()
+
+channel.queue_declare(queue='task_queue', durable=True)
+print(' [*] Waiting for messages. To exit press CTRL+C')
+
+
+def callback(ch, method, properties, body):
+    print(f" [x] Received {body.decode()}")
+    time.sleep(body.count(b'.'))
+    print(" [x] Done")
+    ch.basic_ack(delivery_tag=method.delivery_tag)
+
+
+channel.basic_qos(prefetch_count=1)
+channel.basic_consume(queue='task_queue', on_message_callback=callback)
+
+channel.start_consuming()

vaksman_valeria_lab_4/lesson_3/emit_log.py

@@ -0,0 +1,13 @@
+import pika
+import sys
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters(host='localhost'))
+channel = connection.channel()
+
+channel.exchange_declare(exchange='logs', exchange_type='fanout')
+
+message = ' '.join(sys.argv[1:]) or "info: Hello World!"
+channel.basic_publish(exchange='logs', routing_key='', body=message)
+print(f" [x] Sent {message}")
+connection.close()

vaksman_valeria_lab_4/lesson_3/receive_logs.py

@@ -0,0 +1,22 @@
+import pika
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters(host='localhost'))
+channel = connection.channel()
+
+channel.exchange_declare(exchange='logs', exchange_type='fanout')
+
+result = channel.queue_declare(queue='', exclusive=True)
+queue_name = result.method.queue
+
+channel.queue_bind(exchange='logs', queue=queue_name)
+
+print(' [*] Waiting for logs. To exit press CTRL+C')
+
+def callback(ch, method, properties, body):
+    print(f" [x] {body}")
+
+channel.basic_consume(
+    queue=queue_name, on_message_callback=callback, auto_ack=True)
+
+channel.start_consuming()

vaksman_valeria_lab_4/venv/Lib/site-packages/_distutils_hack/__init__.py

@@ -0,0 +1,222 @@
+# don't import any costly modules
+import sys
+import os
+
+
+is_pypy = '__pypy__' in sys.builtin_module_names
+
+
+def warn_distutils_present():
+    if 'distutils' not in sys.modules:
+        return
+    if is_pypy and sys.version_info < (3, 7):
+        # PyPy for 3.6 unconditionally imports distutils, so bypass the warning
+        # https://foss.heptapod.net/pypy/pypy/-/blob/be829135bc0d758997b3566062999ee8b23872b4/lib-python/3/site.py#L250
+        return
+    import warnings
+
+    warnings.warn(
+        "Distutils was imported before Setuptools, but importing Setuptools "
+        "also replaces the `distutils` module in `sys.modules`. This may lead "
+        "to undesirable behaviors or errors. To avoid these issues, avoid "
+        "using distutils directly, ensure that setuptools is installed in the "
+        "traditional way (e.g. not an editable install), and/or make sure "
+        "that setuptools is always imported before distutils."
+    )
+
+
+def clear_distutils():
+    if 'distutils' not in sys.modules:
+        return
+    import warnings
+
+    warnings.warn("Setuptools is replacing distutils.")
+    mods = [
+        name
+        for name in sys.modules
+        if name == "distutils" or name.startswith("distutils.")
+    ]
+    for name in mods:
+        del sys.modules[name]
+
+
+def enabled():
+    """
+    Allow selection of distutils by environment variable.
+    """
+    which = os.environ.get('SETUPTOOLS_USE_DISTUTILS', 'local')
+    return which == 'local'
+
+
+def ensure_local_distutils():
+    import importlib
+
+    clear_distutils()
+
+    # With the DistutilsMetaFinder in place,
+    # perform an import to cause distutils to be
+    # loaded from setuptools._distutils. Ref #2906.
+    with shim():
+        importlib.import_module('distutils')
+
+    # check that submodules load as expected
+    core = importlib.import_module('distutils.core')
+    assert '_distutils' in core.__file__, core.__file__
+    assert 'setuptools._distutils.log' not in sys.modules
+
+
+def do_override():
+    """
+    Ensure that the local copy of distutils is preferred over stdlib.
+
+    See https://github.com/pypa/setuptools/issues/417#issuecomment-392298401
+    for more motivation.
+    """
+    if enabled():
+        warn_distutils_present()
+        ensure_local_distutils()
+
+
+class _TrivialRe:
+    def __init__(self, *patterns):
+        self._patterns = patterns
+
+    def match(self, string):
+        return all(pat in string for pat in self._patterns)
+
+
+class DistutilsMetaFinder:
+    def find_spec(self, fullname, path, target=None):
+        # optimization: only consider top level modules and those
+        # found in the CPython test suite.
+        if path is not None and not fullname.startswith('test.'):
+            return
+
+        method_name = 'spec_for_{fullname}'.format(**locals())
+        method = getattr(self, method_name, lambda: None)
+        return method()
+
+    def spec_for_distutils(self):
+        if self.is_cpython():
+            return
+
+        import importlib
+        import importlib.abc
+        import importlib.util
+
+        try:
+            mod = importlib.import_module('setuptools._distutils')
+        except Exception:
+            # There are a couple of cases where setuptools._distutils
+            # may not be present:
+            # - An older Setuptools without a local distutils is
+            #   taking precedence. Ref #2957.
+            # - Path manipulation during sitecustomize removes
+            #   setuptools from the path but only after the hook
+            #   has been loaded. Ref #2980.
+            # In either case, fall back to stdlib behavior.
+            return
+
+        class DistutilsLoader(importlib.abc.Loader):
+            def create_module(self, spec):
+                mod.__name__ = 'distutils'
+                return mod
+
+            def exec_module(self, module):
+                pass
+
+        return importlib.util.spec_from_loader(
+            'distutils', DistutilsLoader(), origin=mod.__file__
+        )
+
+    @staticmethod
+    def is_cpython():
+        """
+        Suppress supplying distutils for CPython (build and tests).
+        Ref #2965 and #3007.
+        """
+        return os.path.isfile('pybuilddir.txt')
+
+    def spec_for_pip(self):
+        """
+        Ensure stdlib distutils when running under pip.
+        See pypa/pip#8761 for rationale.
+        """
+        if self.pip_imported_during_build():
+            return
+        clear_distutils()
+        self.spec_for_distutils = lambda: None
+
+    @classmethod
+    def pip_imported_during_build(cls):
+        """
+        Detect if pip is being imported in a build script. Ref #2355.
+        """
+        import traceback
+
+        return any(
+            cls.frame_file_is_setup(frame) for frame, line in traceback.walk_stack(None)
+        )
+
+    @staticmethod
+    def frame_file_is_setup(frame):
+        """
+        Return True if the indicated frame suggests a setup.py file.
+        """
+        # some frames may not have __file__ (#2940)
+        return frame.f_globals.get('__file__', '').endswith('setup.py')
+
+    def spec_for_sensitive_tests(self):
+        """
+        Ensure stdlib distutils when running select tests under CPython.
+
+        python/cpython#91169
+        """
+        clear_distutils()
+        self.spec_for_distutils = lambda: None
+
+    sensitive_tests = (
+        [
+            'test.test_distutils',
+            'test.test_peg_generator',
+            'test.test_importlib',
+        ]
+        if sys.version_info < (3, 10)
+        else [
+            'test.test_distutils',
+        ]
+    )
+
+
+for name in DistutilsMetaFinder.sensitive_tests:
+    setattr(
+        DistutilsMetaFinder,
+        f'spec_for_{name}',
+        DistutilsMetaFinder.spec_for_sensitive_tests,
+    )
+
+
+DISTUTILS_FINDER = DistutilsMetaFinder()
+
+
+def add_shim():
+    DISTUTILS_FINDER in sys.meta_path or insert_shim()
+
+
+class shim:
+    def __enter__(self):
+        insert_shim()
+
+    def __exit__(self, exc, value, tb):
+        remove_shim()
+
+
+def insert_shim():
+    sys.meta_path.insert(0, DISTUTILS_FINDER)
+
+
+def remove_shim():
+    try:
+        sys.meta_path.remove(DISTUTILS_FINDER)
+    except ValueError:
+        pass

vaksman_valeria_lab_4/venv/Lib/site-packages/_distutils_hack/override.py

@@ -0,0 +1 @@
+__import__('_distutils_hack').do_override()

vaksman_valeria_lab_4/venv/Lib/site-packages/distutils-precedence.pth

@@ -0,0 +1 @@
+import os; var = 'SETUPTOOLS_USE_DISTUTILS'; enabled = os.environ.get(var, 'local') == 'local'; enabled and __import__('_distutils_hack').add_shim(); 

vaksman_valeria_lab_4/venv/Lib/site-packages/pika-1.3.2.dist-info/INSTALLER

@@ -0,0 +1 @@
+pip

vaksman_valeria_lab_4/venv/Lib/site-packages/pika-1.3.2.dist-info/LICENSE

@@ -0,0 +1,25 @@
+Copyright (c) 2009-2021, Tony Garnock-Jones, Gavin M. Roy, Pivotal Software, Inc and others.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+ * Neither the name of the Pika project nor the names of its contributors may be used
+   to endorse or promote products derived from this software without specific
+   prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vaksman_valeria_lab_4/venv/Lib/site-packages/pika-1.3.2.dist-info/METADATA

@@ -0,0 +1,320 @@
+Metadata-Version: 2.1
+Name: pika
+Version: 1.3.2
+Summary: Pika Python AMQP Client Library
+Maintainer-email: "Gavin M. Roy" <gavinmroy@gmail.com>, Luke Bakken <lukerbakken@gmail.com>
+License: BSD-3-Clause
+Project-URL: Homepage, https://pika.readthedocs.io
+Project-URL: Source, https://github.com/pika/pika
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Intended Audience :: Developers
+Classifier: License :: OSI Approved :: BSD License
+Classifier: Natural Language :: English
+Classifier: Operating System :: OS Independent
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3.7
+Classifier: Programming Language :: Python :: 3.8
+Classifier: Programming Language :: Python :: 3.9
+Classifier: Programming Language :: Python :: 3.10
+Classifier: Programming Language :: Python :: 3.11
+Classifier: Programming Language :: Python :: Implementation :: CPython
+Classifier: Programming Language :: Python :: Implementation :: Jython
+Classifier: Programming Language :: Python :: Implementation :: PyPy
+Classifier: Topic :: Communications
+Classifier: Topic :: Internet
+Classifier: Topic :: Software Development :: Libraries
+Classifier: Topic :: Software Development :: Libraries :: Python Modules
+Classifier: Topic :: System :: Networking
+Requires-Python: >=3.7
+Description-Content-Type: text/x-rst
+License-File: LICENSE
+Provides-Extra: gevent
+Requires-Dist: gevent ; extra == 'gevent'
+Provides-Extra: tornado
+Requires-Dist: tornado ; extra == 'tornado'
+Provides-Extra: twisted
+Requires-Dist: twisted ; extra == 'twisted'
+
+Pika
+====
+Pika is a RabbitMQ (AMQP 0-9-1) client library for Python.
+
+|Version| |Python versions| |Actions Status| |Coverage| |License| |Docs|
+
+Introduction
+------------
+Pika is a pure-Python implementation of the AMQP 0-9-1 protocol including
+RabbitMQ's extensions.
+
+- Supports Python 3.7+ (`1.1.0` was the last version to support 2.7)
+- Since threads aren't appropriate to every situation, it doesn't require
+  threads. Pika core takes care not to forbid them, either. The same goes for
+  greenlets, callbacks, continuations, and generators. An instance of Pika's
+  built-in connection adapters isn't thread-safe, however.
+- People may be using direct sockets, plain old ``select()``, or any of the
+  wide variety of ways of getting network events to and from a Python
+  application. Pika tries to stay compatible with all of these, and to make
+  adapting it to a new environment as simple as possible.
+
+Documentation
+-------------
+Pika's documentation can be found at https://pika.readthedocs.io.
+
+Example
+-------
+Here is the most simple example of use, sending a message with the
+``pika.BlockingConnection`` adapter:
+
+.. code :: python
+
+    import pika
+
+    connection = pika.BlockingConnection()
+    channel = connection.channel()
+    channel.basic_publish(exchange='test', routing_key='test',
+                          body=b'Test message.')
+    connection.close()
+
+And an example of writing a blocking consumer:
+
+.. code :: python
+
+    import pika
+
+    connection = pika.BlockingConnection()
+    channel = connection.channel()
+
+    for method_frame, properties, body in channel.consume('test'):
+        # Display the message parts and acknowledge the message
+        print(method_frame, properties, body)
+        channel.basic_ack(method_frame.delivery_tag)
+
+        # Escape out of the loop after 10 messages
+        if method_frame.delivery_tag == 10:
+            break
+
+    # Cancel the consumer and return any pending messages
+    requeued_messages = channel.cancel()
+    print('Requeued %i messages' % requeued_messages)
+    connection.close()
+
+Pika provides the following adapters
+------------------------------------
+
+- ``pika.adapters.asyncio_connection.AsyncioConnection`` - asynchronous adapter
+  for Python 3 `AsyncIO <https://docs.python.org/3/library/asyncio.html>`_'s
+  I/O loop.
+- ``pika.BlockingConnection`` - synchronous adapter on top of library for
+  simple usage.
+- ``pika.SelectConnection`` - asynchronous adapter without third-party
+  dependencies.
+- ``pika.adapters.gevent_connection.GeventConnection`` - asynchronous adapter
+  for use with `Gevent <http://www.gevent.org>`_'s I/O loop.
+- ``pika.adapters.tornado_connection.TornadoConnection`` - asynchronous adapter
+  for use with `Tornado <http://tornadoweb.org>`_'s I/O loop.
+- ``pika.adapters.twisted_connection.TwistedProtocolConnection`` - asynchronous
+  adapter for use with `Twisted <http://twistedmatrix.com>`_'s I/O loop.
+
+Multiple connection parameters
+------------------------------
+You can also pass multiple ``pika.ConnectionParameters`` instances for
+fault-tolerance as in the code snippet below (host names are just examples, of
+course). To enable retries, set ``connection_attempts`` and ``retry_delay`` as
+needed in the last ``pika.ConnectionParameters`` element of the sequence.
+Retries occur after connection attempts using all of the given connection
+parameters fail.
+
+.. code :: python
+
+    import pika
+
+    parameters = (
+        pika.ConnectionParameters(host='rabbitmq.zone1.yourdomain.com'),
+        pika.ConnectionParameters(host='rabbitmq.zone2.yourdomain.com',
+                                  connection_attempts=5, retry_delay=1))
+    connection = pika.BlockingConnection(parameters)
+
+With non-blocking adapters, such as ``pika.SelectConnection`` and
+``pika.adapters.asyncio_connection.AsyncioConnection``, you can request a
+connection using multiple connection parameter instances via the connection
+adapter's ``create_connection()`` class method.
+
+Requesting message acknowledgements from another thread
+-------------------------------------------------------
+The single-threaded usage constraint of an individual Pika connection adapter
+instance may result in a dropped AMQP/stream connection due to AMQP heartbeat
+timeout in consumers that take a long time to process an incoming message. A
+common solution is to delegate processing of the incoming messages to another
+thread, while the connection adapter's thread continues to service its I/O
+loop's message pump, permitting AMQP heartbeats and other I/O to be serviced in
+a timely fashion.
+
+Messages processed in another thread may not be acknowledged directly from that
+thread, since all accesses to the connection adapter instance must be from a
+single thread, which is the thread running the adapter's I/O loop. This is
+accomplished by requesting a callback to be executed in the adapter's
+I/O loop thread. For example, the callback function's implementation might look
+like this:
+
+.. code :: python
+
+    def ack_message(channel, delivery_tag):
+        """Note that `channel` must be the same Pika channel instance via which
+        the message being acknowledged was retrieved (AMQP protocol constraint).
+        """
+        if channel.is_open:
+            channel.basic_ack(delivery_tag)
+        else:
+            # Channel is already closed, so we can't acknowledge this message;
+            # log and/or do something that makes sense for your app in this case.
+            pass
+
+The code running in the other thread may request the ``ack_message()`` function
+to be executed in the connection adapter's I/O loop thread using an
+adapter-specific mechanism:
+
+- ``pika.BlockingConnection`` abstracts its I/O loop from the application and
+  thus exposes ``pika.BlockingConnection.add_callback_threadsafe()``. Refer to
+  this method's docstring for additional information. For example:
+
+  .. code :: python
+
+      connection.add_callback_threadsafe(functools.partial(ack_message, channel, delivery_tag))
+
+- When using a non-blocking connection adapter, such as
+  ``pika.adapters.asyncio_connection.AsyncioConnection`` or
+  ``pika.SelectConnection``, you use the underlying asynchronous framework's
+  native API for requesting an I/O loop-bound callback from another thread. For
+  example, ``pika.SelectConnection``'s I/O loop provides
+  ``add_callback_threadsafe()``,
+  ``pika.adapters.tornado_connection.TornadoConnection``'s I/O loop has
+  ``add_callback()``, while
+  ``pika.adapters.asyncio_connection.AsyncioConnection``'s I/O loop exposes
+  ``call_soon_threadsafe()``.
+
+This threadsafe callback request mechanism may also be used to delegate
+publishing of messages, etc., from a background thread to the connection
+adapter's thread.
+
+Connection recovery
+-------------------
+
+Some RabbitMQ clients (Bunny, Java, .NET, Objective-C, Swift) provide a way to
+automatically recover a connection, its channels and topology (e.g. queues,
+bindings and consumers) after a network failure. Others require connection
+recovery to be performed by the application code and strive to make it a
+straightforward process. Pika falls into the second category.
+
+Pika supports multiple connection adapters. They take different approaches to
+connection recovery.
+
+For ``pika.BlockingConnection`` adapter exception handling can be used to check
+for connection errors. Here is a very basic example:
+
+.. code :: python
+
+    import pika
+
+    while True:
+        try:
+            connection = pika.BlockingConnection()
+            channel = connection.channel()
+            channel.basic_consume('test', on_message_callback)
+            channel.start_consuming()
+        # Don't recover if connection was closed by broker
+        except pika.exceptions.ConnectionClosedByBroker:
+            break
+        # Don't recover on channel errors
+        except pika.exceptions.AMQPChannelError:
+            break
+        # Recover on all other connection errors
+        except pika.exceptions.AMQPConnectionError:
+            continue
+
+This example can be found in `examples/consume_recover.py`.
+
+Generic operation retry libraries such as
+`retry <https://github.com/invl/retry>`_ can be used. Decorators make it
+possible to configure some additional recovery behaviours, like delays between
+retries and limiting the number of retries:
+
+.. code :: python
+
+    from retry import retry
+
+
+    @retry(pika.exceptions.AMQPConnectionError, delay=5, jitter=(1, 3))
+    def consume():
+        connection = pika.BlockingConnection()
+        channel = connection.channel()
+        channel.basic_consume('test', on_message_callback)
+
+        try:
+            channel.start_consuming()
+        # Don't recover connections closed by server
+        except pika.exceptions.ConnectionClosedByBroker:
+            pass
+
+
+    consume()
+
+This example can be found in `examples/consume_recover_retry.py`.
+
+For asynchronous adapters, use ``on_close_callback`` to react to connection
+failure events. This callback can be used to clean up and recover the
+connection.
+
+An example of recovery using ``on_close_callback`` can be found in
+`examples/asynchronous_consumer_example.py`.
+
+Contributing
+------------
+To contribute to Pika, please make sure that any new features or changes to
+existing functionality **include test coverage**.
+
+*Pull requests that add or change code without adequate test coverage will be
+rejected.*
+
+Additionally, please format your code using
+`Yapf <http://pypi.python.org/pypi/yapf>`_ with ``google`` style prior to
+issuing your pull request. *Note: only format those lines that you have changed
+in your pull request. If you format an entire file and change code outside of
+the scope of your PR, it will likely be rejected.*
+
+Extending to support additional I/O frameworks
+----------------------------------------------
+New non-blocking adapters may be implemented in either of the following ways:
+
+- By subclassing ``pika.BaseConnection``, implementing its abstract method and
+  passing its constructor an implementation of
+  ``pika.adapters.utils.nbio_interface.AbstractIOServices``.
+  ``pika.BaseConnection`` implements ``pika.connection.Connection``'s abstract
+  methods, including internally-initiated connection logic. For examples, refer
+  to the implementations of
+  ``pika.adapters.asyncio_connection.AsyncioConnection``,
+  ``pika.adapters.gevent_connection.GeventConnection`` and
+  ``pika.adapters.tornado_connection.TornadoConnection``.
+- By subclassing ``pika.connection.Connection`` and implementing its abstract
+  methods. This approach facilitates implementation of custom
+  connection-establishment and transport mechanisms. For an example, refer to
+  the implementation of
+  ``pika.adapters.twisted_connection.TwistedProtocolConnection``.
+
+.. |Version| image:: https://img.shields.io/pypi/v/pika.svg?
+   :target: http://badge.fury.io/py/pika
+
+.. |Python versions| image:: https://img.shields.io/pypi/pyversions/pika.svg
+    :target: https://pypi.python.org/pypi/pika
+
+.. |Actions Status| image:: https://github.com/pika/pika/actions/workflows/main.yaml/badge.svg
+   :target: https://github.com/pika/pika/actions/workflows/main.yaml
+
+.. |Coverage| image:: https://img.shields.io/codecov/c/github/pika/pika.svg?
+   :target: https://codecov.io/github/pika/pika?branch=main
+
+.. |License| image:: https://img.shields.io/pypi/l/pika.svg?
+   :target: https://pika.readthedocs.io
+
+.. |Docs| image:: https://readthedocs.org/projects/pika/badge/?version=stable
+   :target: https://pika.readthedocs.io
+   :alt: Documentation Status

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vaksman_valeria_lab_4/venv/Lib/site-packages/pika-1.3.2.dist-info/WHEEL

@@ -0,0 +1,5 @@
+Wheel-Version: 1.0
+Generator: bdist_wheel (0.40.0)
+Root-Is-Purelib: true
+Tag: py3-none-any
+

vaksman_valeria_lab_4/venv/Lib/site-packages/pika-1.3.2.dist-info/top_level.txt

@@ -0,0 +1 @@
+pika

vaksman_valeria_lab_4/venv/Lib/site-packages/pika-1.3.2.dist-info/zip-safe

@@ -0,0 +1 @@
+

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/__init__.py

@@ -0,0 +1,22 @@
+__version__ = '1.3.2'
+
+import logging
+
+# Add NullHandler before importing Pika modules to prevent logging warnings
+logging.getLogger(__name__).addHandler(logging.NullHandler())
+
+# pylint: disable=C0413
+
+from pika.connection import ConnectionParameters
+from pika.connection import URLParameters
+from pika.connection import SSLOptions
+from pika.credentials import PlainCredentials
+from pika.spec import BasicProperties
+from pika.delivery_mode import DeliveryMode
+
+from pika import adapters
+from pika.adapters import BaseConnection
+from pika.adapters import BlockingConnection
+from pika.adapters import SelectConnection
+
+from pika.adapters.utils.connection_workflow import AMQPConnectionWorkflow

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/adapters/__init__.py

@@ -0,0 +1,23 @@
+"""
+Connection Adapters
+===================
+
+Pika provides multiple adapters to connect to RabbitMQ:
+
+- adapters.asyncio_connection.AsyncioConnection: Native Python3 AsyncIO use
+- adapters.blocking_connection.BlockingConnection: Enables blocking,
+  synchronous operation on top of library for simple uses.
+- adapters.gevent_connection.GeventConnection: Connection adapter for use with
+  Gevent.
+- adapters.select_connection.SelectConnection: A native event based connection
+  adapter that implements select, kqueue, poll and epoll.
+- adapters.tornado_connection.TornadoConnection: Connection adapter for use
+  with the Tornado web framework.
+- adapters.twisted_connection.TwistedProtocolConnection: Connection adapter for
+  use with the Twisted framework
+
+"""
+from pika.adapters.base_connection import BaseConnection
+from pika.adapters.blocking_connection import BlockingConnection
+from pika.adapters.select_connection import SelectConnection
+from pika.adapters.select_connection import IOLoop

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/adapters/asyncio_connection.py

@@ -0,0 +1,283 @@
+"""Use pika with the Asyncio EventLoop"""
+
+import asyncio
+import logging
+import sys
+
+from pika.adapters import base_connection
+from pika.adapters.utils import nbio_interface, io_services_utils
+
+LOGGER = logging.getLogger(__name__)
+
+
+if sys.platform == 'win32':
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+
+
+class AsyncioConnection(base_connection.BaseConnection):
+    """ The AsyncioConnection runs on the Asyncio EventLoop.
+
+    """
+
+    def __init__(self,
+                 parameters=None,
+                 on_open_callback=None,
+                 on_open_error_callback=None,
+                 on_close_callback=None,
+                 custom_ioloop=None,
+                 internal_connection_workflow=True):
+        """ Create a new instance of the AsyncioConnection class, connecting
+        to RabbitMQ automatically
+
+        :param pika.connection.Parameters parameters: Connection parameters
+        :param callable on_open_callback: The method to call when the connection
+            is open
+        :param None | method on_open_error_callback: Called if the connection
+            can't be established or connection establishment is interrupted by
+            `Connection.close()`: on_open_error_callback(Connection, exception).
+        :param None | method on_close_callback: Called when a previously fully
+            open connection is closed:
+            `on_close_callback(Connection, exception)`, where `exception` is
+            either an instance of `exceptions.ConnectionClosed` if closed by
+            user or broker or exception of another type that describes the cause
+            of connection failure.
+        :param None | asyncio.AbstractEventLoop |
+            nbio_interface.AbstractIOServices custom_ioloop:
+                Defaults to asyncio.get_event_loop().
+        :param bool internal_connection_workflow: True for autonomous connection
+            establishment which is default; False for externally-managed
+            connection workflow via the `create_connection()` factory.
+
+        """
+        if isinstance(custom_ioloop, nbio_interface.AbstractIOServices):
+            nbio = custom_ioloop
+        else:
+            nbio = _AsyncioIOServicesAdapter(custom_ioloop)
+
+        super().__init__(
+            parameters,
+            on_open_callback,
+            on_open_error_callback,
+            on_close_callback,
+            nbio,
+            internal_connection_workflow=internal_connection_workflow)
+
+    @classmethod
+    def create_connection(cls,
+                          connection_configs,
+                          on_done,
+                          custom_ioloop=None,
+                          workflow=None):
+        """Implement
+        :py:classmethod::`pika.adapters.BaseConnection.create_connection()`.
+
+        """
+        nbio = _AsyncioIOServicesAdapter(custom_ioloop)
+
+        def connection_factory(params):
+            """Connection factory."""
+            if params is None:
+                raise ValueError('Expected pika.connection.Parameters '
+                                 'instance, but got None in params arg.')
+            return cls(
+                parameters=params,
+                custom_ioloop=nbio,
+                internal_connection_workflow=False)
+
+        return cls._start_connection_workflow(
+            connection_configs=connection_configs,
+            connection_factory=connection_factory,
+            nbio=nbio,
+            workflow=workflow,
+            on_done=on_done)
+
+
+class _AsyncioIOServicesAdapter(io_services_utils.SocketConnectionMixin,
+                                io_services_utils.StreamingConnectionMixin,
+                                nbio_interface.AbstractIOServices,
+                                nbio_interface.AbstractFileDescriptorServices):
+    """Implements
+    :py:class:`.utils.nbio_interface.AbstractIOServices` interface
+    on top of `asyncio`.
+
+    NOTE:
+    :py:class:`.utils.nbio_interface.AbstractFileDescriptorServices`
+    interface is only required by the mixins.
+
+    """
+
+    def __init__(self, loop=None):
+        """
+        :param asyncio.AbstractEventLoop | None loop: If None, gets default
+            event loop from asyncio.
+
+        """
+        self._loop = loop or asyncio.get_event_loop()
+
+    def get_native_ioloop(self):
+        """Implement
+        :py:meth:`.utils.nbio_interface.AbstractIOServices.get_native_ioloop()`.
+
+        """
+        return self._loop
+
+    def close(self):
+        """Implement
+        :py:meth:`.utils.nbio_interface.AbstractIOServices.close()`.
+
+        """
+        self._loop.close()
+
+    def run(self):
+        """Implement :py:meth:`.utils.nbio_interface.AbstractIOServices.run()`.
+
+        """
+        self._loop.run_forever()
+
+    def stop(self):
+        """Implement :py:meth:`.utils.nbio_interface.AbstractIOServices.stop()`.
+
+        """
+        self._loop.stop()
+
+    def add_callback_threadsafe(self, callback):
+        """Implement
+        :py:meth:`.utils.nbio_interface.AbstractIOServices.add_callback_threadsafe()`.
+
+        """
+        self._loop.call_soon_threadsafe(callback)
+
+    def call_later(self, delay, callback):
+        """Implement
+        :py:meth:`.utils.nbio_interface.AbstractIOServices.call_later()`.
+
+        """
+        return _TimerHandle(self._loop.call_later(delay, callback))
+
+    def getaddrinfo(self,
+                    host,
+                    port,
+                    on_done,
+                    family=0,
+                    socktype=0,
+                    proto=0,
+                    flags=0):
+        """Implement
+        :py:meth:`.utils.nbio_interface.AbstractIOServices.getaddrinfo()`.
+
+        """
+        return self._schedule_and_wrap_in_io_ref(
+            self._loop.getaddrinfo(
+                host,
+                port,
+                family=family,
+                type=socktype,
+                proto=proto,
+                flags=flags), on_done)
+
+    def set_reader(self, fd, on_readable):
+        """Implement
+        :py:meth:`.utils.nbio_interface.AbstractFileDescriptorServices.set_reader()`.
+
+        """
+        self._loop.add_reader(fd, on_readable)
+        LOGGER.debug('set_reader(%s, _)', fd)
+
+    def remove_reader(self, fd):
+        """Implement
+        :py:meth:`.utils.nbio_interface.AbstractFileDescriptorServices.remove_reader()`.
+
+        """
+        LOGGER.debug('remove_reader(%s)', fd)
+        return self._loop.remove_reader(fd)
+
+    def set_writer(self, fd, on_writable):
+        """Implement
+        :py:meth:`.utils.nbio_interface.AbstractFileDescriptorServices.set_writer()`.
+
+        """
+        self._loop.add_writer(fd, on_writable)
+        LOGGER.debug('set_writer(%s, _)', fd)
+
+    def remove_writer(self, fd):
+        """Implement
+        :py:meth:`.utils.nbio_interface.AbstractFileDescriptorServices.remove_writer()`.
+
+        """
+        LOGGER.debug('remove_writer(%s)', fd)
+        return self._loop.remove_writer(fd)
+
+    def _schedule_and_wrap_in_io_ref(self, coro, on_done):
+        """Schedule the coroutine to run and return _AsyncioIOReference
+
+        :param coroutine-obj coro:
+        :param callable on_done: user callback that takes the completion result
+            or exception as its only arg. It will not be called if the operation
+            was cancelled.
+        :rtype: _AsyncioIOReference which is derived from
+            nbio_interface.AbstractIOReference
+
+        """
+        if not callable(on_done):
+            raise TypeError(
+                'on_done arg must be callable, but got {!r}'.format(on_done))
+
+        return _AsyncioIOReference(
+            asyncio.ensure_future(coro, loop=self._loop), on_done)
+
+
+class _TimerHandle(nbio_interface.AbstractTimerReference):
+    """This module's adaptation of `nbio_interface.AbstractTimerReference`.
+
+    """
+
+    def __init__(self, handle):
+        """
+
+        :param asyncio.Handle handle:
+        """
+        self._handle = handle
+
+    def cancel(self):
+        if self._handle is not None:
+            self._handle.cancel()
+            self._handle = None
+
+
+class _AsyncioIOReference(nbio_interface.AbstractIOReference):
+    """This module's adaptation of `nbio_interface.AbstractIOReference`.
+
+    """
+
+    def __init__(self, future, on_done):
+        """
+        :param asyncio.Future future:
+        :param callable on_done: user callback that takes the completion result
+            or exception as its only arg. It will not be called if the operation
+            was cancelled.
+
+        """
+        if not callable(on_done):
+            raise TypeError(
+                'on_done arg must be callable, but got {!r}'.format(on_done))
+
+        self._future = future
+
+        def on_done_adapter(future):
+            """Handle completion callback from the future instance"""
+
+            # NOTE: Asyncio schedules callback for cancelled futures, but pika
+            # doesn't want that
+            if not future.cancelled():
+                on_done(future.exception() or future.result())
+
+        future.add_done_callback(on_done_adapter)
+
+    def cancel(self):
+        """Cancel pending operation
+
+        :returns: False if was already done or cancelled; True otherwise
+        :rtype: bool
+
+        """
+        return self._future.cancel()

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/adapters/base_connection.py

@@ -0,0 +1,501 @@
+"""Base class extended by connection adapters. This extends the
+connection.Connection class to encapsulate connection behavior but still
+isolate socket and low level communication.
+
+"""
+import abc
+import functools
+import logging
+
+import pika.compat
+import pika.exceptions
+import pika.tcp_socket_opts
+
+from pika.adapters.utils import connection_workflow, nbio_interface
+from pika import connection
+
+LOGGER = logging.getLogger(__name__)
+
+
+class BaseConnection(connection.Connection):
+    """BaseConnection class that should be extended by connection adapters.
+
+    This class abstracts I/O loop and transport services from pika core.
+
+    """
+
+    def __init__(self, parameters, on_open_callback, on_open_error_callback,
+                 on_close_callback, nbio, internal_connection_workflow):
+        """Create a new instance of the Connection object.
+
+        :param None|pika.connection.Parameters parameters: Connection parameters
+        :param None|method on_open_callback: Method to call on connection open
+        :param None | method on_open_error_callback: Called if the connection
+            can't be established or connection establishment is interrupted by
+            `Connection.close()`: on_open_error_callback(Connection, exception).
+        :param None | method on_close_callback: Called when a previously fully
+            open connection is closed:
+            `on_close_callback(Connection, exception)`, where `exception` is
+            either an instance of `exceptions.ConnectionClosed` if closed by
+            user or broker or exception of another type that describes the cause
+            of connection failure.
+        :param pika.adapters.utils.nbio_interface.AbstractIOServices nbio:
+            asynchronous services
+        :param bool internal_connection_workflow: True for autonomous connection
+            establishment which is default; False for externally-managed
+            connection workflow via the `create_connection()` factory.
+        :raises: RuntimeError
+        :raises: ValueError
+
+        """
+        if parameters and not isinstance(parameters, connection.Parameters):
+            raise ValueError(
+                'Expected instance of Parameters, not %r' % (parameters,))
+
+        self._nbio = nbio
+
+        self._connection_workflow = None  # type: connection_workflow.AMQPConnectionWorkflow
+        self._transport = None  # type: pika.adapters.utils.nbio_interface.AbstractStreamTransport
+
+        self._got_eof = False  # transport indicated EOF (connection reset)
+
+        super(BaseConnection, self).__init__(
+            parameters,
+            on_open_callback,
+            on_open_error_callback,
+            on_close_callback,
+            internal_connection_workflow=internal_connection_workflow)
+
+    def _init_connection_state(self):
+        """Initialize or reset all of our internal state variables for a given
+        connection. If we disconnect and reconnect, all of our state needs to
+        be wiped.
+
+        """
+        super(BaseConnection, self)._init_connection_state()
+
+        self._connection_workflow = None
+        self._transport = None
+        self._got_eof = False
+
+    def __repr__(self):
+
+        # def get_socket_repr(sock):
+        #     """Return socket info suitable for use in repr"""
+        #     if sock is None:
+        #         return None
+        #
+        #     sockname = None
+        #     peername = None
+        #     try:
+        #         sockname = sock.getsockname()
+        #     except pika.compat.SOCKET_ERROR:
+        #         # closed?
+        #         pass
+        #     else:
+        #         try:
+        #             peername = sock.getpeername()
+        #         except pika.compat.SOCKET_ERROR:
+        #             # not connected?
+        #             pass
+        #
+        #     return '%s->%s' % (sockname, peername)
+        # TODO need helpful __repr__ in transports
+        return ('<%s %s transport=%s params=%s>' % (
+            self.__class__.__name__, self._STATE_NAMES[self.connection_state],
+            self._transport, self.params))
+
+    @classmethod
+    @abc.abstractmethod
+    def create_connection(cls,
+                          connection_configs,
+                          on_done,
+                          custom_ioloop=None,
+                          workflow=None):
+        """Asynchronously create a connection to an AMQP broker using the given
+        configurations. Will attempt to connect using each config in the given
+        order, including all compatible resolved IP addresses of the hostname
+        supplied in each config, until one is established or all attempts fail.
+
+        See also `_start_connection_workflow()`.
+
+        :param sequence connection_configs: A sequence of one or more
+            `pika.connection.Parameters`-based objects.
+        :param callable on_done: as defined in
+            `connection_workflow.AbstractAMQPConnectionWorkflow.start()`.
+        :param object | None custom_ioloop: Provide a custom I/O loop that is
+            native to the specific adapter implementation; if None, the adapter
+            will use a default loop instance, which is typically a singleton.
+        :param connection_workflow.AbstractAMQPConnectionWorkflow | None workflow:
+            Pass an instance of an implementation of the
+            `connection_workflow.AbstractAMQPConnectionWorkflow` interface;
+            defaults to a `connection_workflow.AMQPConnectionWorkflow` instance
+            with default values for optional args.
+        :returns: Connection workflow instance in use. The user should limit
+            their interaction with this object only to it's `abort()` method.
+        :rtype: connection_workflow.AbstractAMQPConnectionWorkflow
+
+        """
+        raise NotImplementedError
+
+    @classmethod
+    def _start_connection_workflow(cls, connection_configs, connection_factory,
+                                   nbio, workflow, on_done):
+        """Helper function for custom implementations of `create_connection()`.
+
+        :param sequence connection_configs: A sequence of one or more
+            `pika.connection.Parameters`-based objects.
+        :param callable connection_factory: A function that takes
+            `pika.connection.Parameters` as its only arg and returns a brand new
+            `pika.connection.Connection`-based adapter instance each time it is
+            called. The factory must instantiate the connection with
+            `internal_connection_workflow=False`.
+        :param pika.adapters.utils.nbio_interface.AbstractIOServices nbio:
+        :param connection_workflow.AbstractAMQPConnectionWorkflow | None workflow:
+            Pass an instance of an implementation of the
+            `connection_workflow.AbstractAMQPConnectionWorkflow` interface;
+            defaults to a `connection_workflow.AMQPConnectionWorkflow` instance
+            with default values for optional args.
+        :param callable on_done: as defined in
+            :py:meth:`connection_workflow.AbstractAMQPConnectionWorkflow.start()`.
+        :returns: Connection workflow instance in use. The user should limit
+            their interaction with this object only to it's `abort()` method.
+        :rtype: connection_workflow.AbstractAMQPConnectionWorkflow
+
+        """
+        if workflow is None:
+            workflow = connection_workflow.AMQPConnectionWorkflow()
+            LOGGER.debug('Created default connection workflow %r', workflow)
+
+        if isinstance(workflow, connection_workflow.AMQPConnectionWorkflow):
+            workflow.set_io_services(nbio)
+
+        def create_connector():
+            """`AMQPConnector` factory."""
+            return connection_workflow.AMQPConnector(
+                lambda params: _StreamingProtocolShim(
+                    connection_factory(params)),
+                nbio)
+
+        workflow.start(
+            connection_configs=connection_configs,
+            connector_factory=create_connector,
+            native_loop=nbio.get_native_ioloop(),
+            on_done=functools.partial(cls._unshim_connection_workflow_callback,
+                                      on_done))
+
+        return workflow
+
+    @property
+    def ioloop(self):
+        """
+        :returns: the native I/O loop instance underlying async services selected
+            by user or the default selected by the specialized connection
+            adapter (e.g., Twisted reactor, `asyncio.SelectorEventLoop`,
+            `select_connection.IOLoop`, etc.)
+        :rtype: object
+        """
+        return self._nbio.get_native_ioloop()
+
+    def _adapter_call_later(self, delay, callback):
+        """Implement
+        :py:meth:`pika.connection.Connection._adapter_call_later()`.
+
+        """
+        return self._nbio.call_later(delay, callback)
+
+    def _adapter_remove_timeout(self, timeout_id):
+        """Implement
+        :py:meth:`pika.connection.Connection._adapter_remove_timeout()`.
+
+        """
+        timeout_id.cancel()
+
+    def _adapter_add_callback_threadsafe(self, callback):
+        """Implement
+        :py:meth:`pika.connection.Connection._adapter_add_callback_threadsafe()`.
+
+        """
+        if not callable(callback):
+            raise TypeError(
+                'callback must be a callable, but got %r' % (callback,))
+
+        self._nbio.add_callback_threadsafe(callback)
+
+    def _adapter_connect_stream(self):
+        """Initiate full-stack connection establishment asynchronously for
+        internally-initiated connection bring-up.
+
+        Upon failed completion, we will invoke
+        `Connection._on_stream_terminated()`. NOTE: On success,
+        the stack will be up already, so there is no corresponding callback.
+
+        """
+        self._connection_workflow = connection_workflow.AMQPConnectionWorkflow(
+            _until_first_amqp_attempt=True)
+
+        self._connection_workflow.set_io_services(self._nbio)
+
+        def create_connector():
+            """`AMQPConnector` factory"""
+            return connection_workflow.AMQPConnector(
+                lambda _params: _StreamingProtocolShim(self), self._nbio)
+
+        self._connection_workflow.start(
+            [self.params],
+            connector_factory=create_connector,
+            native_loop=self._nbio.get_native_ioloop(),
+            on_done=functools.partial(self._unshim_connection_workflow_callback,
+                                      self._on_connection_workflow_done))
+
+    @staticmethod
+    def _unshim_connection_workflow_callback(user_on_done, shim_or_exc):
+        """
+
+        :param callable user_on_done: user's `on_done` callback as defined in
+            :py:meth:`connection_workflow.AbstractAMQPConnectionWorkflow.start()`.
+        :param _StreamingProtocolShim | Exception shim_or_exc:
+        """
+        result = shim_or_exc
+        if isinstance(result, _StreamingProtocolShim):
+            result = result.conn
+
+        user_on_done(result)
+
+    def _abort_connection_workflow(self):
+        """Asynchronously abort connection workflow. Upon
+        completion, `Connection._on_stream_terminated()` will be called with None
+        as the error argument.
+
+        Assumption: may be called only while connection is opening.
+
+        """
+        assert not self._opened, (
+            '_abort_connection_workflow() may be called only when '
+            'connection is opening.')
+
+        if self._transport is None:
+            # NOTE: this is possible only when user calls Connection.close() to
+            # interrupt internally-initiated connection establishment.
+            # self._connection_workflow.abort() would not call
+            # Connection.close() before pairing of connection with transport.
+            assert self._internal_connection_workflow, (
+                'Unexpected _abort_connection_workflow() call with '
+                'no transport in external connection workflow mode.')
+
+            # This will result in call to _on_connection_workflow_done() upon
+            # completion
+            self._connection_workflow.abort()
+        else:
+            # NOTE: we can't use self._connection_workflow.abort() in this case,
+            # because it would result in infinite recursion as we're called
+            # from Connection.close() and _connection_workflow.abort() calls
+            # Connection.close() to abort a connection that's already been
+            # paired with a transport. During internally-initiated connection
+            # establishment, AMQPConnectionWorkflow will discover that user
+            # aborted the connection when it receives
+            # pika.exceptions.ConnectionOpenAborted.
+
+            # This completes asynchronously, culminating in call to our method
+            # `connection_lost()`
+            self._transport.abort()
+
+    def _on_connection_workflow_done(self, conn_or_exc):
+        """`AMQPConnectionWorkflow` completion callback.
+
+        :param BaseConnection | Exception conn_or_exc: Our own connection
+            instance on success; exception on failure. See
+            `AbstractAMQPConnectionWorkflow.start()` for details.
+
+        """
+        LOGGER.debug('Full-stack connection workflow completed: %r',
+                     conn_or_exc)
+
+        self._connection_workflow = None
+
+        # Notify protocol of failure
+        if isinstance(conn_or_exc, Exception):
+            self._transport = None
+            if isinstance(conn_or_exc,
+                          connection_workflow.AMQPConnectionWorkflowAborted):
+                LOGGER.info('Full-stack connection workflow aborted: %r',
+                            conn_or_exc)
+                # So that _handle_connection_workflow_failure() will know it's
+                # not a failure
+                conn_or_exc = None
+            else:
+                LOGGER.error('Full-stack connection workflow failed: %r',
+                             conn_or_exc)
+                if (isinstance(conn_or_exc,
+                               connection_workflow.AMQPConnectionWorkflowFailed)
+                        and isinstance(
+                            conn_or_exc.exceptions[-1], connection_workflow.
+                            AMQPConnectorSocketConnectError)):
+                    conn_or_exc = pika.exceptions.AMQPConnectionError(
+                        conn_or_exc)
+
+            self._handle_connection_workflow_failure(conn_or_exc)
+        else:
+            # NOTE: On success, the stack will be up already, so there is no
+            #       corresponding callback.
+            assert conn_or_exc is self, \
+                'Expected self conn={!r} from workflow, but got {!r}.'.format(
+                    self, conn_or_exc)
+
+    def _handle_connection_workflow_failure(self, error):
+        """Handle failure of self-initiated stack bring-up and call
+        `Connection._on_stream_terminated()` if connection is not in closed state
+        yet. Called by adapter layer when the full-stack connection workflow
+        fails.
+
+        :param Exception | None error: exception instance describing the reason
+            for failure or None if the connection workflow was aborted.
+        """
+        if error is None:
+            LOGGER.info('Self-initiated stack bring-up aborted.')
+        else:
+            LOGGER.error('Self-initiated stack bring-up failed: %r', error)
+
+        if not self.is_closed:
+            self._on_stream_terminated(error)
+        else:
+            # This may happen when AMQP layer bring up was started but did not
+            # complete
+            LOGGER.debug('_handle_connection_workflow_failure(): '
+                         'suppressing - connection already closed.')
+
+    def _adapter_disconnect_stream(self):
+        """Asynchronously bring down the streaming transport layer and invoke
+        `Connection._on_stream_terminated()` asynchronously when complete.
+
+        """
+        if not self._opened:
+            self._abort_connection_workflow()
+        else:
+            # This completes asynchronously, culminating in call to our method
+            # `connection_lost()`
+            self._transport.abort()
+
+    def _adapter_emit_data(self, data):
+        """Take ownership of data and send it to AMQP server as soon as
+        possible.
+
+        :param bytes data:
+
+        """
+        self._transport.write(data)
+
+    def _proto_connection_made(self, transport):
+        """Introduces transport to protocol after transport is connected.
+
+        :py:class:`.utils.nbio_interface.AbstractStreamProtocol` implementation.
+
+        :param nbio_interface.AbstractStreamTransport transport:
+        :raises Exception: Exception-based exception on error
+
+        """
+        self._transport = transport
+
+        # Let connection know that stream is available
+        self._on_stream_connected()
+
+    def _proto_connection_lost(self, error):
+        """Called upon loss or closing of TCP connection.
+
+        :py:class:`.utils.nbio_interface.AbstractStreamProtocol` implementation.
+
+        NOTE: `connection_made()` and `connection_lost()` are each called just
+        once and in that order. All other callbacks are called between them.
+
+        :param BaseException | None error: An exception (check for
+            `BaseException`) indicates connection failure. None indicates that
+            connection was closed on this side, such as when it's aborted or
+            when `AbstractStreamProtocol.eof_received()` returns a falsy result.
+        :raises Exception: Exception-based exception on error
+
+        """
+        self._transport = None
+
+        if error is None:
+            # Either result of `eof_received()` or abort
+            if self._got_eof:
+                error = pika.exceptions.StreamLostError(
+                    'Transport indicated EOF')
+        else:
+            error = pika.exceptions.StreamLostError(
+                'Stream connection lost: {!r}'.format(error))
+
+        LOGGER.log(logging.DEBUG if error is None else logging.ERROR,
+                   'connection_lost: %r', error)
+
+        self._on_stream_terminated(error)
+
+    def _proto_eof_received(self):  # pylint: disable=R0201
+        """Called after the remote peer shuts its write end of the connection.
+        :py:class:`.utils.nbio_interface.AbstractStreamProtocol` implementation.
+
+        :returns: A falsy value (including None) will cause the transport to
+            close itself, resulting in an eventual `connection_lost()` call
+            from the transport. If a truthy value is returned, it will be the
+            protocol's responsibility to close/abort the transport.
+        :rtype: falsy|truthy
+        :raises Exception: Exception-based exception on error
+
+        """
+        LOGGER.error('Transport indicated EOF.')
+
+        self._got_eof = True
+
+        # This is how a reset connection will typically present itself
+        # when we have nothing to send to the server over plaintext stream.
+        #
+        # Have transport tear down the connection and invoke our
+        # `connection_lost` method
+        return False
+
+    def _proto_data_received(self, data):
+        """Called to deliver incoming data from the server to the protocol.
+
+        :py:class:`.utils.nbio_interface.AbstractStreamProtocol` implementation.
+
+        :param data: Non-empty data bytes.
+        :raises Exception: Exception-based exception on error
+
+        """
+        self._on_data_available(data)
+
+
+class _StreamingProtocolShim(nbio_interface.AbstractStreamProtocol):
+    """Shim for callbacks from transport so that we BaseConnection can
+    delegate to private methods, thus avoiding contamination of API with
+    methods that look public, but aren't.
+
+    """
+
+    # Override AbstractStreamProtocol abstract methods to enable instantiation
+    connection_made = None
+    connection_lost = None
+    eof_received = None
+    data_received = None
+
+    def __init__(self, conn):
+        """
+        :param BaseConnection conn:
+        """
+        self.conn = conn
+        # pylint: disable=W0212
+        self.connection_made = conn._proto_connection_made
+        self.connection_lost = conn._proto_connection_lost
+        self.eof_received = conn._proto_eof_received
+        self.data_received = conn._proto_data_received
+
+    def __getattr__(self, attr):
+        """Proxy inexistent attribute requests to our connection instance
+        so that AMQPConnectionWorkflow/AMQPConnector may treat the shim as an
+        actual connection.
+
+        """
+        return getattr(self.conn, attr)
+
+    def __repr__(self):
+        return '{}: {!r}'.format(self.__class__.__name__, self.conn)

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/adapters/gevent_connection.py

@@ -0,0 +1,469 @@
+"""Use pika with the Gevent IOLoop."""
+
+import functools
+import logging
+import os
+import threading
+import weakref
+
+try:
+    import queue
+except ImportError:  # Python <= v2.7
+    import Queue as queue
+
+import gevent
+import gevent.hub
+import gevent.socket
+
+import pika.compat
+from pika.adapters.base_connection import BaseConnection
+from pika.adapters.utils.io_services_utils import check_callback_arg
+from pika.adapters.utils.nbio_interface import (
+    AbstractIOReference,
+    AbstractIOServices,
+)
+from pika.adapters.utils.selector_ioloop_adapter import (
+    AbstractSelectorIOLoop,
+    SelectorIOServicesAdapter,
+)
+
+LOGGER = logging.getLogger(__name__)
+
+
+class GeventConnection(BaseConnection):
+    """Implementation of pika's ``BaseConnection``.
+
+    An async selector-based connection which integrates with Gevent.
+    """
+
+    def __init__(self,
+                 parameters=None,
+                 on_open_callback=None,
+                 on_open_error_callback=None,
+                 on_close_callback=None,
+                 custom_ioloop=None,
+                 internal_connection_workflow=True):
+        """Create a new GeventConnection instance and connect to RabbitMQ on
+        Gevent's event-loop.
+
+        :param pika.connection.Parameters|None parameters: The connection
+            parameters
+        :param callable|None on_open_callback: The method to call when the
+            connection is open
+        :param callable|None on_open_error_callback: Called if the connection
+            can't be established or connection establishment is interrupted by
+            `Connection.close()`:
+            on_open_error_callback(Connection, exception)
+        :param callable|None on_close_callback: Called when a previously fully
+            open connection is closed:
+            `on_close_callback(Connection, exception)`, where `exception` is
+            either an instance of `exceptions.ConnectionClosed` if closed by
+            user or broker or exception of another type that describes the
+            cause of connection failure
+        :param gevent._interfaces.ILoop|nbio_interface.AbstractIOServices|None
+            custom_ioloop: Use a custom Gevent ILoop.
+        :param bool internal_connection_workflow: True for autonomous connection
+            establishment which is default; False for externally-managed
+            connection workflow via the `create_connection()` factory
+        """
+        if pika.compat.ON_WINDOWS:
+            raise RuntimeError('GeventConnection is not supported on Windows.')
+
+        custom_ioloop = (custom_ioloop or
+                         _GeventSelectorIOLoop(gevent.get_hub()))
+
+        if isinstance(custom_ioloop, AbstractIOServices):
+            nbio = custom_ioloop
+        else:
+            nbio = _GeventSelectorIOServicesAdapter(custom_ioloop)
+
+        super(GeventConnection, self).__init__(
+            parameters,
+            on_open_callback,
+            on_open_error_callback,
+            on_close_callback,
+            nbio,
+            internal_connection_workflow=internal_connection_workflow)
+
+    @classmethod
+    def create_connection(cls,
+                          connection_configs,
+                          on_done,
+                          custom_ioloop=None,
+                          workflow=None):
+        """Implement
+        :py:classmethod::`pika.adapters.BaseConnection.create_connection()`.
+        """
+        custom_ioloop = (custom_ioloop or
+                         _GeventSelectorIOLoop(gevent.get_hub()))
+
+        nbio = _GeventSelectorIOServicesAdapter(custom_ioloop)
+
+        def connection_factory(params):
+            """Connection factory."""
+            if params is None:
+                raise ValueError('Expected pika.connection.Parameters '
+                                 'instance, but got None in params arg.')
+            return cls(parameters=params,
+                       custom_ioloop=nbio,
+                       internal_connection_workflow=False)
+
+        return cls._start_connection_workflow(
+            connection_configs=connection_configs,
+            connection_factory=connection_factory,
+            nbio=nbio,
+            workflow=workflow,
+            on_done=on_done)
+
+
+class _TSafeCallbackQueue(object):
+    """Dispatch callbacks from any thread to be executed in the main thread
+    efficiently with IO events.
+    """
+
+    def __init__(self):
+        """
+        :param _GeventSelectorIOLoop loop: IO loop to add callbacks to.
+        """
+        # Thread-safe, blocking queue.
+        self._queue = queue.Queue()
+        # PIPE to trigger an event when the queue is ready.
+        self._read_fd, self._write_fd = os.pipe()
+        # Lock around writes to the PIPE in case some platform/implementation
+        # requires this.
+        self._write_lock = threading.RLock()
+
+    @property
+    def fd(self):
+        """The file-descriptor to register for READ events in the IO loop."""
+        return self._read_fd
+
+    def add_callback_threadsafe(self, callback):
+        """Add an item to the queue from any thread. The configured handler
+        will be invoked with the item in the main thread.
+
+        :param item: Object to add to the queue.
+        """
+        self._queue.put(callback)
+        with self._write_lock:
+            # The value written is not important.
+            os.write(self._write_fd, b'\xFF')
+
+    def run_next_callback(self):
+        """Invoke the next callback from the queue.
+
+        MUST run in the main thread. If no callback was added to the queue,
+        this will block the IO loop.
+
+        Performs a blocking READ on the pipe so must only be called when the
+        pipe is ready for reading.
+        """
+        try:
+            callback = self._queue.get_nowait()
+        except queue.Empty:
+            # Should never happen.
+            LOGGER.warning("Callback queue was empty.")
+        else:
+            # Read the byte from the pipe so the event doesn't re-fire.
+            os.read(self._read_fd, 1)
+            callback()
+
+
+class _GeventSelectorIOLoop(AbstractSelectorIOLoop):
+    """Implementation of `AbstractSelectorIOLoop` using the Gevent event loop.
+
+    Required by implementations of `SelectorIOServicesAdapter`.
+    """
+    # Gevent's READ and WRITE masks are defined as 1 and 2 respectively. No
+    # ERROR mask is defined.
+    # See http://www.gevent.org/api/gevent.hub.html#gevent._interfaces.ILoop.io
+    READ = 1
+    WRITE = 2
+    ERROR = 0
+
+    def __init__(self, gevent_hub=None):
+        """
+        :param gevent._interfaces.ILoop gevent_loop:
+        """
+        self._hub = gevent_hub or gevent.get_hub()
+        self._io_watchers_by_fd = {}
+        # Used to start/stop the loop.
+        self._waiter = gevent.hub.Waiter()
+
+        # For adding callbacks from other threads. See `add_callback(..)`.
+        self._callback_queue = _TSafeCallbackQueue()
+
+        def run_callback_in_main_thread(fd, events):
+            """Swallow the fd and events arguments."""
+            del fd
+            del events
+            self._callback_queue.run_next_callback()
+
+        self.add_handler(self._callback_queue.fd, run_callback_in_main_thread,
+                         self.READ)
+
+    def close(self):
+        """Release the loop's resources."""
+        self._hub.loop.destroy()
+        self._hub = None
+
+    def start(self):
+        """Run the I/O loop. It will loop until requested to exit. See `stop()`.
+        """
+        LOGGER.debug("Passing control to Gevent's IOLoop")
+        self._waiter.get()  # Block until 'stop()' is called.
+
+        LOGGER.debug("Control was passed back from Gevent's IOLoop")
+        self._waiter.clear()
+
+    def stop(self):
+        """Request exit from the ioloop. The loop is NOT guaranteed to
+        stop before this method returns.
+
+        To invoke `stop()` safely from a thread other than this IOLoop's thread,
+        call it via `add_callback_threadsafe`; e.g.,
+
+            `ioloop.add_callback(ioloop.stop)`
+        """
+        self._waiter.switch(None)
+
+    def add_callback(self, callback):
+        """Requests a call to the given function as soon as possible in the
+        context of this IOLoop's thread.
+
+        NOTE: This is the only thread-safe method in IOLoop. All other
+        manipulations of IOLoop must be performed from the IOLoop's thread.
+
+        For example, a thread may request a call to the `stop` method of an
+        ioloop that is running in a different thread via
+        `ioloop.add_callback_threadsafe(ioloop.stop)`
+
+        :param callable callback: The callback method
+        """
+        if gevent.get_hub() == self._hub:
+            # We're in the main thread; just add the callback.
+            LOGGER.debug("Adding callback from main thread")
+            self._hub.loop.run_callback(callback)
+        else:
+            # This isn't the main thread and Gevent's hub/loop don't provide
+            # any thread-safety so enqueue the callback for it to be registered
+            # in the main thread.
+            LOGGER.debug("Adding callback from another thread")
+            callback = functools.partial(self._hub.loop.run_callback, callback)
+            self._callback_queue.add_callback_threadsafe(callback)
+
+    def call_later(self, delay, callback):
+        """Add the callback to the IOLoop timer to be called after delay seconds
+        from the time of call on best-effort basis. Returns a handle to the
+        timeout.
+
+        :param float delay: The number of seconds to wait to call callback
+        :param callable callback: The callback method
+        :returns: handle to the created timeout that may be passed to
+            `remove_timeout()`
+        :rtype: object
+        """
+        timer = self._hub.loop.timer(delay)
+        timer.start(callback)
+        return timer
+
+    def remove_timeout(self, timeout_handle):
+        """Remove a timeout
+
+        :param timeout_handle: Handle of timeout to remove
+        """
+        timeout_handle.close()
+
+    def add_handler(self, fd, handler, events):
+        """Start watching the given file descriptor for events
+
+        :param int fd: The file descriptor
+        :param callable handler: When requested event(s) occur,
+            `handler(fd, events)` will be called.
+        :param int events: The event mask (READ|WRITE)
+        """
+        io_watcher = self._hub.loop.io(fd, events)
+        self._io_watchers_by_fd[fd] = io_watcher
+        io_watcher.start(handler, fd, events)
+
+    def update_handler(self, fd, events):
+        """Change the events being watched for.
+
+        :param int fd: The file descriptor
+        :param int events: The new event mask (READ|WRITE)
+        """
+        io_watcher = self._io_watchers_by_fd[fd]
+        # Save callback from the original watcher. The close the old watcher
+        # and create a new one using the saved callback and the new events.
+        callback = io_watcher.callback
+        io_watcher.close()
+        del self._io_watchers_by_fd[fd]
+        self.add_handler(fd, callback, events)
+
+    def remove_handler(self, fd):
+        """Stop watching the given file descriptor for events
+
+        :param int fd: The file descriptor
+        """
+        io_watcher = self._io_watchers_by_fd[fd]
+        io_watcher.close()
+        del self._io_watchers_by_fd[fd]
+
+
+class _GeventSelectorIOServicesAdapter(SelectorIOServicesAdapter):
+    """SelectorIOServicesAdapter implementation using Gevent's DNS resolver."""
+
+    def getaddrinfo(self,
+                    host,
+                    port,
+                    on_done,
+                    family=0,
+                    socktype=0,
+                    proto=0,
+                    flags=0):
+        """Implement :py:meth:`.nbio_interface.AbstractIOServices.getaddrinfo()`.
+        """
+        resolver = _GeventAddressResolver(native_loop=self._loop,
+                                          host=host,
+                                          port=port,
+                                          family=family,
+                                          socktype=socktype,
+                                          proto=proto,
+                                          flags=flags,
+                                          on_done=on_done)
+        resolver.start()
+        # Return needs an implementation of `AbstractIOReference`.
+        return _GeventIOLoopIOHandle(resolver)
+
+
+class _GeventIOLoopIOHandle(AbstractIOReference):
+    """Implement `AbstractIOReference`.
+
+    Only used to wrap the _GeventAddressResolver.
+    """
+
+    def __init__(self, subject):
+        """
+        :param subject: subject of the reference containing a `cancel()` method
+        """
+        self._cancel = subject.cancel
+
+    def cancel(self):
+        """Cancel pending operation
+
+        :returns: False if was already done or cancelled; True otherwise
+        :rtype: bool
+        """
+        return self._cancel()
+
+
+class _GeventAddressResolver(object):
+    """Performs getaddrinfo asynchronously Gevent's configured resolver in a
+    separate greenlet and invoking the provided callback with the result.
+
+    See: http://www.gevent.org/dns.html
+    """
+    __slots__ = (
+        '_loop',
+        '_on_done',
+        '_greenlet',
+        # getaddrinfo(..) args:
+        '_ga_host',
+        '_ga_port',
+        '_ga_family',
+        '_ga_socktype',
+        '_ga_proto',
+        '_ga_flags')
+
+    def __init__(self, native_loop, host, port, family, socktype, proto, flags,
+                 on_done):
+        """Initialize the `_GeventAddressResolver`.
+
+        :param AbstractSelectorIOLoop native_loop:
+        :param host: `see socket.getaddrinfo()`
+        :param port: `see socket.getaddrinfo()`
+        :param family: `see socket.getaddrinfo()`
+        :param socktype: `see socket.getaddrinfo()`
+        :param proto: `see socket.getaddrinfo()`
+        :param flags: `see socket.getaddrinfo()`
+        :param on_done: on_done(records|BaseException) callback for reporting
+            result from the given I/O loop. The single arg will be either an
+            exception object (check for `BaseException`) in case of failure or
+            the result returned by `socket.getaddrinfo()`.
+        """
+        check_callback_arg(on_done, 'on_done')
+
+        self._loop = native_loop
+        self._on_done = on_done
+        # Reference to the greenlet performing `getaddrinfo`.
+        self._greenlet = None
+        # getaddrinfo(..) args.
+        self._ga_host = host
+        self._ga_port = port
+        self._ga_family = family
+        self._ga_socktype = socktype
+        self._ga_proto = proto
+        self._ga_flags = flags
+
+    def start(self):
+        """Start an asynchronous getaddrinfo invocation."""
+        if self._greenlet is None:
+            self._greenlet = gevent.spawn_raw(self._resolve)
+        else:
+            LOGGER.warning("_GeventAddressResolver already started")
+
+    def cancel(self):
+        """Cancel the pending resolver."""
+        changed = False
+
+        if self._greenlet is not None:
+            changed = True
+            self._stop_greenlet()
+
+        self._cleanup()
+        return changed
+
+    def _cleanup(self):
+        """Stop the resolver and release any resources."""
+        self._stop_greenlet()
+        self._loop = None
+        self._on_done = None
+
+    def _stop_greenlet(self):
+        """Stop the greenlet performing getaddrinfo if running.
+
+        Otherwise, this is a no-op.
+        """
+        if self._greenlet is not None:
+            gevent.kill(self._greenlet)
+            self._greenlet = None
+
+    def _resolve(self):
+        """Call `getaddrinfo()` and return result via user's callback
+        function on the configured IO loop.
+        """
+        try:
+            # NOTE(JG): Can't use kwargs with getaddrinfo on Python <= v2.7.
+            result = gevent.socket.getaddrinfo(self._ga_host, self._ga_port,
+                                               self._ga_family,
+                                               self._ga_socktype,
+                                               self._ga_proto, self._ga_flags)
+        except Exception as exc:  # pylint: disable=broad-except
+            LOGGER.error('Address resolution failed: %r', exc)
+            result = exc
+
+        callback = functools.partial(self._dispatch_callback, result)
+        self._loop.add_callback(callback)
+
+    def _dispatch_callback(self, result):
+        """Invoke the configured completion callback and any subsequent cleanup.
+
+        :param result: result from getaddrinfo, or the exception if raised.
+        """
+        try:
+            LOGGER.debug(
+                'Invoking async getaddrinfo() completion callback; host=%r',
+                self._ga_host)
+            self._on_done(result)
+        finally:
+            self._cleanup()

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/adapters/tornado_connection.py

@@ -0,0 +1,90 @@
+"""Use pika with the Tornado IOLoop
+
+"""
+import logging
+
+from tornado import ioloop
+
+from pika.adapters.utils import nbio_interface, selector_ioloop_adapter
+from pika.adapters import base_connection
+
+LOGGER = logging.getLogger(__name__)
+
+
+class TornadoConnection(base_connection.BaseConnection):
+    """The TornadoConnection runs on the Tornado IOLoop.
+    """
+
+    def __init__(self,
+                 parameters=None,
+                 on_open_callback=None,
+                 on_open_error_callback=None,
+                 on_close_callback=None,
+                 custom_ioloop=None,
+                 internal_connection_workflow=True):
+        """Create a new instance of the TornadoConnection class, connecting
+        to RabbitMQ automatically.
+
+        :param pika.connection.Parameters|None parameters: The connection
+            parameters
+        :param callable|None on_open_callback: The method to call when the
+            connection is open
+        :param callable|None on_open_error_callback: Called if the connection
+            can't be established or connection establishment is interrupted by
+            `Connection.close()`:
+            on_open_error_callback(Connection, exception)
+        :param callable|None on_close_callback: Called when a previously fully
+            open connection is closed:
+            `on_close_callback(Connection, exception)`, where `exception` is
+            either an instance of `exceptions.ConnectionClosed` if closed by
+            user or broker or exception of another type that describes the
+            cause of connection failure
+        :param ioloop.IOLoop|nbio_interface.AbstractIOServices|None custom_ioloop:
+            Override using the global IOLoop in Tornado
+        :param bool internal_connection_workflow: True for autonomous connection
+            establishment which is default; False for externally-managed
+            connection workflow via the `create_connection()` factory
+
+        """
+        if isinstance(custom_ioloop, nbio_interface.AbstractIOServices):
+            nbio = custom_ioloop
+        else:
+            nbio = (selector_ioloop_adapter.SelectorIOServicesAdapter(
+                custom_ioloop or ioloop.IOLoop.instance()))
+        super(TornadoConnection, self).__init__(
+            parameters,
+            on_open_callback,
+            on_open_error_callback,
+            on_close_callback,
+            nbio,
+            internal_connection_workflow=internal_connection_workflow)
+
+    @classmethod
+    def create_connection(cls,
+                          connection_configs,
+                          on_done,
+                          custom_ioloop=None,
+                          workflow=None):
+        """Implement
+        :py:classmethod::`pika.adapters.BaseConnection.create_connection()`.
+
+        """
+        nbio = selector_ioloop_adapter.SelectorIOServicesAdapter(
+            custom_ioloop or ioloop.IOLoop.instance())
+
+        def connection_factory(params):
+            """Connection factory."""
+            if params is None:
+                raise ValueError('Expected pika.connection.Parameters '
+                                 'instance, but got None in params arg.')
+            return cls(
+                parameters=params,
+                custom_ioloop=nbio,
+                internal_connection_workflow=False)
+
+        return cls._start_connection_workflow(
+            connection_configs=connection_configs,
+            connection_factory=connection_factory,
+            nbio=nbio,
+            workflow=workflow,
+            on_done=on_done)

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/adapters/utils/connection_workflow.py

@@ -0,0 +1,866 @@
+"""Implements `AMQPConnectionWorkflow` - the default workflow of performing
+multiple TCP/[SSL]/AMQP connection attempts with timeouts and retries until one
+succeeds or all attempts fail.
+
+Defines the interface `AbstractAMQPConnectionWorkflow` that facilitates
+implementing custom connection workflows.
+
+"""
+
+import functools
+import logging
+import socket
+
+import pika.compat
+import pika.exceptions
+import pika.tcp_socket_opts
+from pika import __version__
+
+_LOG = logging.getLogger(__name__)
+
+
+class AMQPConnectorException(Exception):
+    """Base exception for this module"""
+
+
+class AMQPConnectorStackTimeout(AMQPConnectorException):
+    """Overall TCP/[SSL]/AMQP stack connection attempt timed out."""
+
+
+class AMQPConnectorAborted(AMQPConnectorException):
+    """Asynchronous request was aborted"""
+
+
+class AMQPConnectorWrongState(AMQPConnectorException):
+    """AMQPConnector operation requested in wrong state, such as aborting after
+    completion was reported.
+    """
+
+
+class AMQPConnectorPhaseErrorBase(AMQPConnectorException):
+    """Wrapper for exception that occurred during a particular bring-up phase.
+
+    """
+
+    def __init__(self, exception, *args):
+        """
+
+        :param BaseException exception: error that occurred while waiting for a
+            subclass-specific protocol bring-up phase to complete.
+        :param args: args for parent class
+        """
+        super(AMQPConnectorPhaseErrorBase, self).__init__(*args)
+        self.exception = exception
+
+    def __repr__(self):
+        return '{}: {!r}'.format(self.__class__.__name__, self.exception)
+
+
+class AMQPConnectorSocketConnectError(AMQPConnectorPhaseErrorBase):
+    """Error connecting TCP socket to remote peer"""
+
+
+class AMQPConnectorTransportSetupError(AMQPConnectorPhaseErrorBase):
+    """Error setting up transport after TCP connected but before AMQP handshake.
+
+    """
+
+
+class AMQPConnectorAMQPHandshakeError(AMQPConnectorPhaseErrorBase):
+    """Error during AMQP handshake"""
+
+
+class AMQPConnectionWorkflowAborted(AMQPConnectorException):
+    """AMQP Connection workflow was aborted."""
+
+
+class AMQPConnectionWorkflowWrongState(AMQPConnectorException):
+    """AMQP Connection Workflow operation requested in wrong state, such as
+    aborting after completion was reported.
+    """
+
+
+class AMQPConnectionWorkflowFailed(AMQPConnectorException):
+    """Indicates that AMQP connection workflow failed.
+
+    """
+
+    def __init__(self, exceptions, *args):
+        """
+        :param sequence exceptions: Exceptions that occurred during the
+            workflow.
+        :param args: args to pass to base class
+
+        """
+        super(AMQPConnectionWorkflowFailed, self).__init__(*args)
+        self.exceptions = tuple(exceptions)
+
+    def __repr__(self):
+        return ('{}: {} exceptions in all; last exception - {!r}; first '
+                'exception - {!r}').format(
+                    self.__class__.__name__, len(self.exceptions),
+                    self.exceptions[-1],
+                    self.exceptions[0] if len(self.exceptions) > 1 else None)
+
+
+class AMQPConnector(object):
+    """Performs a single TCP/[SSL]/AMQP connection workflow.
+
+    """
+
+    _STATE_INIT = 0  # start() hasn't been called yet
+    _STATE_TCP = 1  # TCP/IP connection establishment
+    _STATE_TRANSPORT = 2  # [SSL] and transport linkup
+    _STATE_AMQP = 3  # AMQP connection handshake
+    _STATE_TIMEOUT = 4  # overall TCP/[SSL]/AMQP timeout
+    _STATE_ABORTING = 5  # abort() called - aborting workflow
+    _STATE_DONE = 6  # result reported to client
+
+    def __init__(self, conn_factory, nbio):
+        """
+
+        :param callable conn_factory: A function that takes
+            `pika.connection.Parameters` as its only arg and returns a brand new
+            `pika.connection.Connection`-based adapter instance each time it is
+            called. The factory must instantiate the connection with
+            `internal_connection_workflow=False`.
+        :param pika.adapters.utils.nbio_interface.AbstractIOServices nbio:
+
+        """
+        self._conn_factory = conn_factory
+        self._nbio = nbio
+        self._addr_record = None  # type: tuple
+        self._conn_params = None  # type: pika.connection.Parameters
+        self._on_done = None  # will be provided via start()
+        # TCP connection timeout
+        # pylint: disable=C0301
+        self._tcp_timeout_ref = None  # type: pika.adapters.utils.nbio_interface.AbstractTimerReference
+        # Overall TCP/[SSL]/AMQP timeout
+        self._stack_timeout_ref = None  # type: pika.adapters.utils.nbio_interface.AbstractTimerReference
+        # Current task
+        self._task_ref = None  # type: pika.adapters.utils.nbio_interface.AbstractIOReference
+        self._sock = None  # type: socket.socket
+        self._amqp_conn = None  # type: pika.connection.Connection
+
+        self._state = self._STATE_INIT
+
+    def start(self, addr_record, conn_params, on_done):
+        """Asynchronously perform a single TCP/[SSL]/AMQP connection attempt.
+
+        :param tuple addr_record: a single resolved address record compatible
+            with `socket.getaddrinfo()` format.
+        :param pika.connection.Parameters conn_params:
+        :param callable on_done: Function to call upon completion of the
+            workflow: `on_done(pika.connection.Connection | BaseException)`. If
+            exception, it's going to be one of the following:
+                `AMQPConnectorSocketConnectError`
+                `AMQPConnectorTransportSetupError`
+                `AMQPConnectorAMQPHandshakeError`
+                `AMQPConnectorAborted`
+
+        """
+        if self._state != self._STATE_INIT:
+            raise AMQPConnectorWrongState(
+                'Already in progress or finished; state={}'.format(self._state))
+
+        self._addr_record = addr_record
+        self._conn_params = conn_params
+        self._on_done = on_done
+
+        # Create socket and initiate TCP/IP connection
+        self._state = self._STATE_TCP
+        self._sock = socket.socket(*self._addr_record[:3])
+        self._sock.setsockopt(pika.compat.SOL_TCP, socket.TCP_NODELAY, 1)
+        pika.tcp_socket_opts.set_sock_opts(self._conn_params.tcp_options,
+                                           self._sock)
+        self._sock.setblocking(False)
+
+        addr = self._addr_record[4]
+        _LOG.info('Pika version %s connecting to %r', __version__, addr)
+        self._task_ref = self._nbio.connect_socket(
+            self._sock, addr, on_done=self._on_tcp_connection_done)
+
+        # Start socket connection timeout timer
+        self._tcp_timeout_ref = None
+        if self._conn_params.socket_timeout is not None:
+            self._tcp_timeout_ref = self._nbio.call_later(
+                self._conn_params.socket_timeout,
+                self._on_tcp_connection_timeout)
+
+        # Start overall TCP/[SSL]/AMQP stack connection timeout timer
+        self._stack_timeout_ref = None
+        if self._conn_params.stack_timeout is not None:
+            self._stack_timeout_ref = self._nbio.call_later(
+                self._conn_params.stack_timeout, self._on_overall_timeout)
+
+    def abort(self):
+        """Abort the workflow asynchronously. The completion callback will be
+        called with an instance of AMQPConnectorAborted.
+
+        NOTE: we can't cancel/close synchronously because aborting pika
+        Connection and its transport requires an asynchronous operation.
+
+        :raises AMQPConnectorWrongState: If called after completion has been
+            reported or the workflow not started yet.
+        """
+        if self._state == self._STATE_INIT:
+            raise AMQPConnectorWrongState('Cannot abort before starting.')
+
+        if self._state == self._STATE_DONE:
+            raise AMQPConnectorWrongState('Cannot abort after completion was reported')
+
+        self._state = self._STATE_ABORTING
+        self._deactivate()
+
+        _LOG.info(
+            'AMQPConnector: beginning client-initiated asynchronous '
+            'abort; %r/%s', self._conn_params.host, self._addr_record)
+
+        if self._amqp_conn is None:
+            _LOG.debug('AMQPConnector.abort(): no connection, so just '
+                       'scheduling completion report via I/O loop.')
+            self._nbio.add_callback_threadsafe(
+                functools.partial(self._report_completion_and_cleanup,
+                                  AMQPConnectorAborted()))
+        else:
+            if not self._amqp_conn.is_closing:
+                # Initiate close of AMQP connection and wait for asynchronous
+                # callback from the Connection instance before reporting
+                # completion to client
+                _LOG.debug('AMQPConnector.abort(): closing Connection.')
+                self._amqp_conn.close(
+                    320, 'Client-initiated abort of AMQP Connection Workflow.')
+            else:
+                # It's already closing, must be due to our timeout processing,
+                # so we'll just piggy back on the callback it registered
+                _LOG.debug('AMQPConnector.abort(): closing of Connection was '
+                           'already initiated.')
+                assert self._state == self._STATE_TIMEOUT, \
+                    ('Connection is closing, but not in TIMEOUT state; state={}'
+                     .format(self._state))
+
+    def _close(self):
+        """Cancel asynchronous tasks and clean up to assist garbage collection.
+
+        Transition to STATE_DONE.
+
+        """
+        self._deactivate()
+
+        if self._sock is not None:
+            self._sock.close()
+            self._sock = None
+
+        self._conn_factory = None
+        self._nbio = None
+        self._addr_record = None
+        self._on_done = None
+
+        self._state = self._STATE_DONE
+
+    def _deactivate(self):
+        """Cancel asynchronous tasks.
+
+        """
+        # NOTE: self._amqp_conn requires special handling as it doesn't support
+        # synchronous closing. We special-case it elsewhere in the code where
+        # needed.
+        assert self._amqp_conn is None, \
+            '_deactivate called with self._amqp_conn not None; state={}'.format(
+                self._state)
+
+        if self._tcp_timeout_ref is not None:
+            self._tcp_timeout_ref.cancel()
+            self._tcp_timeout_ref = None
+
+        if self._stack_timeout_ref is not None:
+            self._stack_timeout_ref.cancel()
+            self._stack_timeout_ref = None
+
+        if self._task_ref is not None:
+            self._task_ref.cancel()
+            self._task_ref = None
+
+    def _report_completion_and_cleanup(self, result):
+        """Clean up and invoke client's `on_done` callback.
+
+        :param pika.connection.Connection | BaseException result: value to pass
+            to user's `on_done` callback.
+        """
+        if isinstance(result, BaseException):
+            _LOG.error('AMQPConnector - reporting failure: %r', result)
+        else:
+            _LOG.info('AMQPConnector - reporting success: %r', result)
+
+        on_done = self._on_done
+        self._close()
+
+        on_done(result)
+
+    def _on_tcp_connection_timeout(self):
+        """Handle TCP connection timeout
+
+        Reports AMQPConnectorSocketConnectError with socket.timeout inside.
+
+        """
+        self._tcp_timeout_ref = None
+
+        error = AMQPConnectorSocketConnectError(
+            socket.timeout('TCP connection attempt timed out: {!r}/{}'.format(
+                self._conn_params.host, self._addr_record)))
+        self._report_completion_and_cleanup(error)
+
+    def _on_overall_timeout(self):
+        """Handle overall TCP/[SSL]/AMQP connection attempt timeout by reporting
+        `Timeout` error to the client.
+
+        Reports AMQPConnectorSocketConnectError if timeout occurred during
+            socket TCP connection attempt.
+        Reports AMQPConnectorTransportSetupError if timeout occurred during
+            tramsport [SSL] setup attempt.
+        Reports AMQPConnectorAMQPHandshakeError if timeout occurred during
+            AMQP handshake.
+
+        """
+        self._stack_timeout_ref = None
+
+        prev_state = self._state
+        self._state = self._STATE_TIMEOUT
+
+        if prev_state == self._STATE_AMQP:
+            msg = ('Timeout while setting up AMQP to {!r}/{}; ssl={}'.format(
+                self._conn_params.host, self._addr_record,
+                bool(self._conn_params.ssl_options)))
+            _LOG.error(msg)
+            # Initiate close of AMQP connection and wait for asynchronous
+            # callback from the Connection instance before reporting completion
+            # to client
+            assert not self._amqp_conn.is_open, \
+                'Unexpected open state of {!r}'.format(self._amqp_conn)
+            if not self._amqp_conn.is_closing:
+                self._amqp_conn.close(320, msg)
+            return
+
+        if prev_state == self._STATE_TCP:
+            error = AMQPConnectorSocketConnectError(
+                AMQPConnectorStackTimeout(
+                    'Timeout while connecting socket to {!r}/{}'.format(
+                        self._conn_params.host, self._addr_record)))
+        else:
+            assert prev_state == self._STATE_TRANSPORT
+            error = AMQPConnectorTransportSetupError(
+                AMQPConnectorStackTimeout(
+                    'Timeout while setting up transport to {!r}/{}; ssl={}'.
+                    format(self._conn_params.host, self._addr_record,
+                           bool(self._conn_params.ssl_options))))
+
+        self._report_completion_and_cleanup(error)
+
+    def _on_tcp_connection_done(self, exc):
+        """Handle completion of asynchronous socket connection attempt.
+
+        Reports AMQPConnectorSocketConnectError if TCP socket connection
+            failed.
+
+        :param None|BaseException exc: None on success; exception object on
+            failure
+
+        """
+        self._task_ref = None
+        if self._tcp_timeout_ref is not None:
+            self._tcp_timeout_ref.cancel()
+            self._tcp_timeout_ref = None
+
+        if exc is not None:
+            _LOG.error('TCP Connection attempt failed: %r; dest=%r', exc,
+                       self._addr_record)
+            self._report_completion_and_cleanup(
+                AMQPConnectorSocketConnectError(exc))
+            return
+
+        # We succeeded in making a TCP/IP connection to the server
+        _LOG.debug('TCP connection to broker established: %r.', self._sock)
+
+        # Now set up the transport
+        self._state = self._STATE_TRANSPORT
+
+        ssl_context = server_hostname = None
+        if self._conn_params.ssl_options is not None:
+            ssl_context = self._conn_params.ssl_options.context
+            server_hostname = self._conn_params.ssl_options.server_hostname
+            if server_hostname is None:
+                server_hostname = self._conn_params.host
+
+        self._task_ref = self._nbio.create_streaming_connection(
+            protocol_factory=functools.partial(self._conn_factory,
+                                               self._conn_params),
+            sock=self._sock,
+            ssl_context=ssl_context,
+            server_hostname=server_hostname,
+            on_done=self._on_transport_establishment_done)
+
+        self._sock = None  # create_streaming_connection() takes ownership
+
+    def _on_transport_establishment_done(self, result):
+        """Handle asynchronous completion of
+        `AbstractIOServices.create_streaming_connection()`
+
+        Reports AMQPConnectorTransportSetupError if transport ([SSL]) setup
+            failed.
+
+        :param sequence|BaseException result: On success, a two-tuple
+            (transport, protocol); on failure, exception instance.
+
+        """
+        self._task_ref = None
+
+        if isinstance(result, BaseException):
+            _LOG.error(
+                'Attempt to create the streaming transport failed: %r; '
+                '%r/%s; ssl=%s', result, self._conn_params.host,
+                self._addr_record, bool(self._conn_params.ssl_options))
+            self._report_completion_and_cleanup(
+                AMQPConnectorTransportSetupError(result))
+            return
+
+        # We succeeded in setting up the streaming transport!
+        # result is a two-tuple (transport, protocol)
+        _LOG.info('Streaming transport linked up: %r.', result)
+        _transport, self._amqp_conn = result
+
+        # AMQP handshake is in progress - initiated during transport link-up
+        self._state = self._STATE_AMQP
+        # We explicitly remove default handler because it raises an exception.
+        self._amqp_conn.add_on_open_error_callback(
+            self._on_amqp_handshake_done, remove_default=True)
+        self._amqp_conn.add_on_open_callback(self._on_amqp_handshake_done)
+
+    def _on_amqp_handshake_done(self, connection, error=None):
+        """Handle completion of AMQP connection handshake attempt.
+
+        NOTE: we handle two types of callbacks - success with just connection
+        arg as well as the open-error callback with connection and error
+
+        Reports AMQPConnectorAMQPHandshakeError if AMQP handshake failed.
+
+        :param pika.connection.Connection connection:
+        :param BaseException | None error: None on success, otherwise
+            failure
+
+        """
+        _LOG.debug(
+            'AMQPConnector: AMQP handshake attempt completed; state=%s; '
+            'error=%r; %r/%s', self._state, error, self._conn_params.host,
+            self._addr_record)
+
+        # Don't need it any more; and _deactivate() checks that it's None
+        self._amqp_conn = None
+
+        if self._state == self._STATE_ABORTING:
+            # Client-initiated abort takes precedence over timeout
+            result = AMQPConnectorAborted()
+        elif self._state == self._STATE_TIMEOUT:
+            result = AMQPConnectorAMQPHandshakeError(
+                AMQPConnectorStackTimeout(
+                    'Timeout during AMQP handshake{!r}/{}; ssl={}'.format(
+                        self._conn_params.host, self._addr_record,
+                        bool(self._conn_params.ssl_options))))
+        elif self._state == self._STATE_AMQP:
+            if error is None:
+                _LOG.debug(
+                    'AMQPConnector: AMQP connection established for %r/%s: %r',
+                    self._conn_params.host, self._addr_record, connection)
+                result = connection
+            else:
+                _LOG.debug(
+                    'AMQPConnector: AMQP connection handshake failed for '
+                    '%r/%s: %r', self._conn_params.host, self._addr_record,
+                    error)
+                result = AMQPConnectorAMQPHandshakeError(error)
+        else:
+            # We timed out or aborted and initiated closing of the connection,
+            # but this callback snuck in
+            _LOG.debug(
+                'AMQPConnector: Ignoring AMQP handshake completion '
+                'notification due to wrong state=%s; error=%r; conn=%r',
+                self._state, error, connection)
+            return
+
+        self._report_completion_and_cleanup(result)
+
+
+class AbstractAMQPConnectionWorkflow(pika.compat.AbstractBase):
+    """Interface for implementing a custom TCP/[SSL]/AMQP connection workflow.
+
+    """
+
+    def start(self, connection_configs, connector_factory, native_loop,
+              on_done):
+        """Asynchronously perform the workflow until success or all retries
+        are exhausted. Called by the adapter.
+
+        :param sequence connection_configs: A sequence of one or more
+            `pika.connection.Parameters`-based objects. Will attempt to connect
+            using each config in the given order.
+        :param callable connector_factory: call it without args to obtain a new
+            instance of `AMQPConnector` for each connection attempt.
+            See `AMQPConnector` for details.
+        :param native_loop: Native I/O loop passed by app to the adapter or
+            obtained by the adapter by default.
+        :param callable on_done: Function to call upon completion of the
+            workflow:
+            `on_done(pika.connection.Connection |
+                     AMQPConnectionWorkflowFailed |
+                     AMQPConnectionWorkflowAborted)`.
+            `Connection`-based adapter on success,
+            `AMQPConnectionWorkflowFailed` on failure,
+            `AMQPConnectionWorkflowAborted` if workflow was aborted.
+
+        :raises AMQPConnectionWorkflowWrongState: If called in wrong state, such
+            as after starting the workflow.
+        """
+        raise NotImplementedError
+
+    def abort(self):
+        """Abort the workflow asynchronously. The completion callback will be
+        called with an instance of AMQPConnectionWorkflowAborted.
+
+        NOTE: we can't cancel/close synchronously because aborting pika
+        Connection and its transport requires an asynchronous operation.
+
+        :raises AMQPConnectionWorkflowWrongState: If called in wrong state, such
+            as before starting or after completion has been reported.
+        """
+        raise NotImplementedError
+
+
+class AMQPConnectionWorkflow(AbstractAMQPConnectionWorkflow):
+    """Implements Pika's default workflow for performing multiple TCP/[SSL]/AMQP
+    connection attempts with timeouts and retries until one succeeds or all
+    attempts fail.
+
+    The workflow:
+        while not success and retries remain:
+            1. For each given config (pika.connection.Parameters object):
+                A. Perform DNS resolution of the config's host.
+                B. Attempt to establish TCP/[SSL]/AMQP for each resolved address
+                   until one succeeds, in which case we're done.
+            2. If all configs failed but retries remain, resume from beginning
+               after the given retry pause. NOTE: failure of DNS resolution
+               is equivalent to one cycle and will be retried after the pause
+               if retries remain.
+
+    """
+
+    _SOCK_TYPE = socket.SOCK_STREAM
+    _IPPROTO = socket.IPPROTO_TCP
+
+    _STATE_INIT = 0
+    _STATE_ACTIVE = 1
+    _STATE_ABORTING = 2
+    _STATE_DONE = 3
+
+    def __init__(self, _until_first_amqp_attempt=False):
+        """
+        :param int | float retry_pause: Non-negative number of seconds to wait
+            before retrying the config sequence. Meaningful only if retries is
+            greater than 0. Defaults to 2 seconds.
+        :param bool _until_first_amqp_attempt: INTERNAL USE ONLY; ends workflow
+            after first AMQP handshake attempt, regardless of outcome (success
+            or failure). The automatic connection logic in
+            `pika.connection.Connection` enables this because it's not
+            designed/tested to reset all state properly to handle more than one
+            AMQP handshake attempt.
+
+        TODO: Do we need getaddrinfo timeout?
+        TODO: Would it be useful to implement exponential back-off?
+
+        """
+        self._attempts_remaining = None  # supplied by start()
+        self._retry_pause = None  # supplied by start()
+        self._until_first_amqp_attempt = _until_first_amqp_attempt
+
+        # Provided by set_io_services()
+        # pylint: disable=C0301
+        self._nbio = None  # type: pika.adapters.utils.nbio_interface.AbstractIOServices
+
+        # Current index within `_connection_configs`; initialized when
+        # starting a new connection sequence.
+        self._current_config_index = None
+
+        self._connection_configs = None  # supplied by start()
+        self._connector_factory = None  # supplied by start()
+        self._on_done = None  # supplied by start()
+
+        self._connector = None  # type: AMQPConnector
+
+        self._task_ref = None  # current cancelable asynchronous task or timer
+        self._addrinfo_iter = None
+
+        # Exceptions from all failed connection attempts in this workflow
+        self._connection_errors = []
+
+        self._state = self._STATE_INIT
+
+    def set_io_services(self, nbio):
+        """Called by the conneciton adapter only on pika's
+        `AMQPConnectionWorkflow` instance to provide it the adapter-specific
+        `AbstractIOServices` object before calling the `start()` method.
+
+        NOTE: Custom workflow implementations should use the native I/O loop
+        directly because `AbstractIOServices` is private to Pika
+        implementation and its interface may change without notice.
+
+        :param pika.adapters.utils.nbio_interface.AbstractIOServices nbio:
+
+        """
+        self._nbio = nbio
+
+    def start(
+            self,
+            connection_configs,
+            connector_factory,
+            native_loop,  # pylint: disable=W0613
+            on_done):
+        """Override `AbstractAMQPConnectionWorkflow.start()`.
+
+        NOTE: This implementation uses `connection_attempts` and `retry_delay`
+        values from the last element of the given `connection_configs` sequence
+        as the overall number of connection attempts of the entire
+        `connection_configs` sequence and pause between each sequence.
+
+        """
+        if self._state != self._STATE_INIT:
+            raise AMQPConnectorWrongState(
+                'Already in progress or finished; state={}'.format(self._state))
+
+        try:
+            iter(connection_configs)
+        except Exception as error:
+            raise TypeError(
+                'connection_configs does not support iteration: {!r}'.format(
+                    error))
+        if not connection_configs:
+            raise ValueError(
+                'connection_configs is empty: {!r}.'.format(connection_configs))
+
+        self._connection_configs = connection_configs
+        self._connector_factory = connector_factory
+        self._on_done = on_done
+
+        self._attempts_remaining = connection_configs[-1].connection_attempts
+        self._retry_pause = connection_configs[-1].retry_delay
+
+        self._state = self._STATE_ACTIVE
+
+        _LOG.debug('Starting AMQP Connection workflow asynchronously.')
+
+        # Begin from our own I/O loop context to avoid calling back into client
+        # from client's call here
+        self._task_ref = self._nbio.call_later(
+            0, functools.partial(self._start_new_cycle_async, first=True))
+
+    def abort(self):
+        """Override `AbstractAMQPConnectionWorkflow.abort()`.
+
+        """
+        if self._state == self._STATE_INIT:
+            raise AMQPConnectorWrongState('Cannot abort before starting.')
+        elif self._state == self._STATE_DONE:
+            raise AMQPConnectorWrongState(
+                'Cannot abort after completion was reported')
+
+        self._state = self._STATE_ABORTING
+        self._deactivate()
+
+        _LOG.info('AMQPConnectionWorkflow: beginning client-initiated '
+                  'asynchronous abort.')
+
+        if self._connector is None:
+            _LOG.debug('AMQPConnectionWorkflow.abort(): no connector, so just '
+                       'scheduling completion report via I/O loop.')
+            self._nbio.add_callback_threadsafe(
+                functools.partial(self._report_completion_and_cleanup,
+                                  AMQPConnectionWorkflowAborted()))
+        else:
+            _LOG.debug('AMQPConnectionWorkflow.abort(): requesting '
+                       'connector.abort().')
+            self._connector.abort()
+
+    def _close(self):
+        """Cancel asynchronous tasks and clean up to assist garbage collection.
+
+        Transition to _STATE_DONE.
+
+        """
+        self._deactivate()
+
+        self._connection_configs = None
+        self._nbio = None
+        self._connector_factory = None
+        self._on_done = None
+        self._connector = None
+        self._addrinfo_iter = None
+        self._connection_errors = None
+
+        self._state = self._STATE_DONE
+
+    def _deactivate(self):
+        """Cancel asynchronous tasks.
+
+        """
+        if self._task_ref is not None:
+            self._task_ref.cancel()
+            self._task_ref = None
+
+    def _report_completion_and_cleanup(self, result):
+        """Clean up and invoke client's `on_done` callback.
+
+        :param pika.connection.Connection | AMQPConnectionWorkflowFailed result:
+            value to pass to user's `on_done` callback.
+        """
+        if isinstance(result, BaseException):
+            _LOG.error('AMQPConnectionWorkflow - reporting failure: %r', result)
+        else:
+            _LOG.info('AMQPConnectionWorkflow - reporting success: %r', result)
+
+        on_done = self._on_done
+        self._close()
+
+        on_done(result)
+
+    def _start_new_cycle_async(self, first):
+        """Start a new workflow cycle (if any more attempts are left) beginning
+        with the first Parameters object in self._connection_configs. If out of
+        attempts, report `AMQPConnectionWorkflowFailed`.
+
+        :param bool first: if True, don't delay; otherwise delay next attempt by
+            `self._retry_pause` seconds.
+        """
+        self._task_ref = None
+
+        assert self._attempts_remaining >= 0, self._attempts_remaining
+
+        if self._attempts_remaining <= 0:
+            error = AMQPConnectionWorkflowFailed(self._connection_errors)
+            _LOG.error('AMQP connection workflow failed: %r.', error)
+            self._report_completion_and_cleanup(error)
+            return
+
+        self._attempts_remaining -= 1
+        _LOG.debug(
+            'Beginning a new AMQP connection workflow cycle; attempts '
+            'remaining after this: %s', self._attempts_remaining)
+
+        self._current_config_index = None
+
+        self._task_ref = self._nbio.call_later(
+            0 if first else self._retry_pause, self._try_next_config_async)
+
+    def _try_next_config_async(self):
+        """Attempt to connect using the next Parameters config. If there are no
+        more configs, start a new cycle.
+
+        """
+        self._task_ref = None
+
+        if self._current_config_index is None:
+            self._current_config_index = 0
+        else:
+            self._current_config_index += 1
+
+        if self._current_config_index >= len(self._connection_configs):
+            _LOG.debug('_try_next_config_async: starting a new cycle.')
+            self._start_new_cycle_async(first=False)
+            return
+
+        params = self._connection_configs[self._current_config_index]
+
+        _LOG.debug('_try_next_config_async: %r:%s', params.host, params.port)
+
+        # Begin with host address resolution
+        assert self._task_ref is None
+        self._task_ref = self._nbio.getaddrinfo(
+            host=params.host,
+            port=params.port,
+            socktype=self._SOCK_TYPE,
+            proto=self._IPPROTO,
+            on_done=self._on_getaddrinfo_async_done)
+
+    def _on_getaddrinfo_async_done(self, addrinfos_or_exc):
+        """Handles completion callback from asynchronous `getaddrinfo()`.
+
+        :param list | BaseException addrinfos_or_exc: resolved address records
+            returned by `getaddrinfo()` or an exception object from failure.
+        """
+        self._task_ref = None
+
+        if isinstance(addrinfos_or_exc, BaseException):
+            _LOG.error('getaddrinfo failed: %r.', addrinfos_or_exc)
+            self._connection_errors.append(addrinfos_or_exc)
+            self._start_new_cycle_async(first=False)
+            return
+
+        _LOG.debug('getaddrinfo returned %s records', len(addrinfos_or_exc))
+        self._addrinfo_iter = iter(addrinfos_or_exc)
+
+        self._try_next_resolved_address()
+
+    def _try_next_resolved_address(self):
+        """Try connecting using next resolved address. If there aren't any left,
+        continue with next Parameters config.
+
+        """
+        try:
+            addr_record = next(self._addrinfo_iter)
+        except StopIteration:
+            _LOG.debug(
+                '_try_next_resolved_address: continuing with next config.')
+            self._try_next_config_async()
+            return
+
+        _LOG.debug('Attempting to connect using address record %r', addr_record)
+
+        self._connector = self._connector_factory()  # type: AMQPConnector
+
+        self._connector.start(
+            addr_record=addr_record,
+            conn_params=self._connection_configs[self._current_config_index],
+            on_done=self._on_connector_done)
+
+    def _on_connector_done(self, conn_or_exc):
+        """Handle completion of connection attempt by `AMQPConnector`.
+
+        :param pika.connection.Connection | BaseException conn_or_exc: See
+            `AMQPConnector.start()` for exception details.
+
+        """
+        self._connector = None
+        _LOG.debug('Connection attempt completed with %r', conn_or_exc)
+
+        if isinstance(conn_or_exc, BaseException):
+            self._connection_errors.append(conn_or_exc)
+
+            if isinstance(conn_or_exc, AMQPConnectorAborted):
+                assert self._state == self._STATE_ABORTING, \
+                    'Expected _STATE_ABORTING, but got {!r}'.format(self._state)
+
+                self._report_completion_and_cleanup(
+                    AMQPConnectionWorkflowAborted())
+            elif (self._until_first_amqp_attempt and
+                  isinstance(conn_or_exc, AMQPConnectorAMQPHandshakeError)):
+                _LOG.debug('Ending AMQP connection workflow after first failed '
+                           'AMQP handshake due to _until_first_amqp_attempt.')
+                if isinstance(conn_or_exc.exception,
+                              pika.exceptions.ConnectionOpenAborted):
+                    error = AMQPConnectionWorkflowAborted
+                else:
+                    error = AMQPConnectionWorkflowFailed(
+                        self._connection_errors)
+
+                self._report_completion_and_cleanup(error)
+            else:
+                self._try_next_resolved_address()
+        else:
+            # Success!
+            self._report_completion_and_cleanup(conn_or_exc)

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/adapters/utils/nbio_interface.py

@@ -0,0 +1,441 @@
+"""Non-blocking I/O interface for pika connection adapters.
+
+I/O interface expected by `pika.adapters.base_connection.BaseConnection`
+
+NOTE: This API is modeled after asyncio in python3 for a couple of reasons
+    1. It's a sensible API
+    2. To make it easy to implement at least on top of the built-in asyncio
+
+Furthermore, the API caters to the needs of pika core and lack of generalization
+is intentional for the sake of reducing complexity of the implementation and
+testing and lessening the maintenance burden.
+
+"""
+import abc
+
+import pika.compat
+
+
+class AbstractIOServices(pika.compat.AbstractBase):
+    """Interface to I/O services required by `pika.adapters.BaseConnection` and
+    related utilities.
+
+    NOTE: This is not a public API. Pika users should rely on the native I/O
+    loop APIs (e.g., asyncio event loop, tornado ioloop, twisted reactor, etc.)
+    that corresponds to the chosen Connection adapter.
+
+    """
+
+    @abc.abstractmethod
+    def get_native_ioloop(self):
+        """Returns the native I/O loop instance, such as Twisted reactor,
+        asyncio's or tornado's event loop
+
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def close(self):
+        """Release IOLoop's resources.
+
+        the `close()` method is intended to be called by Pika's own test
+        code only after `start()` returns. After calling `close()`, no other
+        interaction with the closed instance of `IOLoop` should be performed.
+
+        NOTE: This method is provided for Pika's own test scripts that need to
+        be able to run I/O loops generically to test multiple Connection Adapter
+        implementations. Pika users should use the native I/O loop's API
+        instead.
+
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def run(self):
+        """Run the I/O loop. It will loop until requested to exit. See `stop()`.
+
+        NOTE: the outcome or restarting an instance that had been stopped is
+        UNDEFINED!
+
+        NOTE: This method is provided for Pika's own test scripts that need to
+        be able to run I/O loops generically to test multiple Connection Adapter
+        implementations (not all of the supported I/O Loop frameworks have
+        methods named start/stop). Pika users should use the native I/O loop's
+        API instead.
+
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def stop(self):
+        """Request exit from the ioloop. The loop is NOT guaranteed to
+        stop before this method returns.
+
+        NOTE: The outcome of calling `stop()` on a non-running instance is
+        UNDEFINED!
+
+        NOTE: This method is provided for Pika's own test scripts that need to
+        be able to run I/O loops generically to test multiple Connection Adapter
+        implementations (not all of the supported I/O Loop frameworks have
+        methods named start/stop). Pika users should use the native I/O loop's
+        API instead.
+
+        To invoke `stop()` safely from a thread other than this IOLoop's thread,
+        call it via `add_callback_threadsafe`; e.g.,
+
+            `ioloop.add_callback_threadsafe(ioloop.stop)`
+
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def add_callback_threadsafe(self, callback):
+        """Requests a call to the given function as soon as possible. It will be
+        called from this IOLoop's thread.
+
+        NOTE: This is the only thread-safe method offered by the IOLoop adapter.
+              All other manipulations of the IOLoop adapter and objects governed
+              by it must be performed from the IOLoop's thread.
+
+        NOTE: if you know that the requester is running on the same thread as
+              the connection it is more efficient to use the
+              `ioloop.call_later()` method with a delay of 0.
+
+        :param callable callback: The callback method; must be callable.
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def call_later(self, delay, callback):
+        """Add the callback to the IOLoop timer to be called after delay seconds
+        from the time of call on best-effort basis. Returns a handle to the
+        timeout.
+
+        If two are scheduled for the same time, it's undefined which one will
+        be called first.
+
+        :param float delay: The number of seconds to wait to call callback
+        :param callable callback: The callback method
+        :returns: A handle that can be used to cancel the request.
+        :rtype: AbstractTimerReference
+
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def getaddrinfo(self,
+                    host,
+                    port,
+                    on_done,
+                    family=0,
+                    socktype=0,
+                    proto=0,
+                    flags=0):
+        """Perform the equivalent of `socket.getaddrinfo()` asynchronously.
+
+        See `socket.getaddrinfo()` for the standard args.
+
+        :param callable on_done: user callback that takes the return value of
+            `socket.getaddrinfo()` upon successful completion or exception upon
+            failure (check for `BaseException`) as its only arg. It will not be
+            called if the operation was cancelled.
+        :rtype: AbstractIOReference
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def connect_socket(self, sock, resolved_addr, on_done):
+        """Perform the equivalent of `socket.connect()` on a previously-resolved
+        address asynchronously.
+
+        IMPLEMENTATION NOTE: Pika's connection logic resolves the addresses
+            prior to making socket connections, so we don't need to burden the
+            implementations of this method with the extra logic of asynchronous
+            DNS resolution. Implementations can use `socket.inet_pton()` to
+            verify the address.
+
+        :param socket.socket sock: non-blocking socket that needs to be
+            connected via `socket.socket.connect()`
+        :param tuple resolved_addr: resolved destination address/port two-tuple
+            as per `socket.socket.connect()`, except that the first element must
+            be an actual IP address that's consistent with the given socket's
+            address family.
+        :param callable on_done: user callback that takes None upon successful
+            completion or exception (check for `BaseException`) upon error as
+            its only arg. It will not be called if the operation was cancelled.
+
+        :rtype: AbstractIOReference
+        :raises ValueError: if host portion of `resolved_addr` is not an IP
+            address or is inconsistent with the socket's address family as
+            validated via `socket.inet_pton()`
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def create_streaming_connection(self,
+                                    protocol_factory,
+                                    sock,
+                                    on_done,
+                                    ssl_context=None,
+                                    server_hostname=None):
+        """Perform SSL session establishment, if requested, on the already-
+        connected socket and link the streaming transport/protocol pair.
+
+        NOTE: This method takes ownership of the socket.
+
+        :param callable protocol_factory: called without args, returns an
+            instance with the `AbstractStreamProtocol` interface. The protocol's
+            `connection_made(transport)` method will be called to link it to
+            the transport after remaining connection activity (e.g., SSL session
+            establishment), if any, is completed successfully.
+        :param socket.socket sock: Already-connected, non-blocking
+            `socket.SOCK_STREAM` socket to be used by the transport. We take
+            ownership of this socket.
+        :param callable on_done: User callback
+            `on_done(BaseException | (transport, protocol))` to be notified when
+            the asynchronous operation completes. An exception arg indicates
+            failure (check for `BaseException`); otherwise the two-tuple will
+            contain the linked transport/protocol pair having
+            AbstractStreamTransport and AbstractStreamProtocol interfaces
+            respectively.
+        :param None | ssl.SSLContext ssl_context: if None, this will proceed as
+            a plaintext connection; otherwise, if not None, SSL session
+            establishment will be performed prior to linking the transport and
+            protocol.
+        :param str | None server_hostname: For use during SSL session
+            establishment to match against the target server's certificate. The
+            value `None` disables this check (which is a huge security risk)
+        :rtype: AbstractIOReference
+        """
+        raise NotImplementedError
+
+
+class AbstractFileDescriptorServices(pika.compat.AbstractBase):
+    """Interface definition of common non-blocking file descriptor services
+    required by some utility implementations.
+
+    NOTE: This is not a public API. Pika users should rely on the native I/O
+    loop APIs (e.g., asyncio event loop, tornado ioloop, twisted reactor, etc.)
+    that corresponds to the chosen Connection adapter.
+
+    """
+
+    @abc.abstractmethod
+    def set_reader(self, fd, on_readable):
+        """Call the given callback when the file descriptor is readable.
+        Replace prior reader, if any, for the given file descriptor.
+
+        :param fd: file descriptor
+        :param callable on_readable: a callback taking no args to be notified
+            when fd becomes readable.
+
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def remove_reader(self, fd):
+        """Stop watching the given file descriptor for readability
+
+        :param fd: file descriptor
+        :returns: True if reader was removed; False if none was registered.
+        :rtype: bool
+
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def set_writer(self, fd, on_writable):
+        """Call the given callback whenever the file descriptor is writable.
+        Replace prior writer callback, if any, for the given file descriptor.
+
+        IMPLEMENTATION NOTE: For portability, implementations of
+            `set_writable()` should also watch for indication of error on the
+            socket and treat it as equivalent to the writable indication (e.g.,
+            also adding the socket to the `exceptfds` arg of `socket.select()`
+            and calling the `on_writable` callback if `select.select()`
+            indicates that the socket is in error state). Specifically, Windows
+            (unlike POSIX) only indicates error on the socket (but not writable)
+            when connection establishment fails.
+
+        :param fd: file descriptor
+        :param callable on_writable: a callback taking no args to be notified
+            when fd becomes writable.
+
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def remove_writer(self, fd):
+        """Stop watching the given file descriptor for writability
+
+        :param fd: file descriptor
+        :returns: True if reader was removed; False if none was registered.
+        :rtype: bool
+
+        """
+        raise NotImplementedError
+
+
+class AbstractTimerReference(pika.compat.AbstractBase):
+    """Reference to asynchronous operation"""
+
+    @abc.abstractmethod
+    def cancel(self):
+        """Cancel callback. If already cancelled, has no affect.
+        """
+        raise NotImplementedError
+
+
+class AbstractIOReference(pika.compat.AbstractBase):
+    """Reference to asynchronous I/O operation"""
+
+    @abc.abstractmethod
+    def cancel(self):
+        """Cancel pending operation
+
+        :returns: False if was already done or cancelled; True otherwise
+        :rtype: bool
+        """
+        raise NotImplementedError
+
+
+class AbstractStreamProtocol(pika.compat.AbstractBase):
+    """Stream protocol interface. It's compatible with a subset of
+    `asyncio.protocols.Protocol` for compatibility with asyncio-based
+    `AbstractIOServices` implementation.
+
+    """
+
+    @abc.abstractmethod
+    def connection_made(self, transport):
+        """Introduces transport to protocol after transport is connected.
+
+        :param AbstractStreamTransport transport:
+        :raises Exception: Exception-based exception on error
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def connection_lost(self, error):
+        """Called upon loss or closing of connection.
+
+        NOTE: `connection_made()` and `connection_lost()` are each called just
+        once and in that order. All other callbacks are called between them.
+
+        :param BaseException | None error: An exception (check for
+            `BaseException`) indicates connection failure. None indicates that
+            connection was closed on this side, such as when it's aborted or
+            when `AbstractStreamProtocol.eof_received()` returns a result that
+            doesn't evaluate to True.
+        :raises Exception: Exception-based exception on error
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def eof_received(self):
+        """Called after the remote peer shuts its write end of the connection.
+
+        :returns: A falsy value (including None) will cause the transport to
+            close itself, resulting in an eventual `connection_lost()` call
+            from the transport. If a truthy value is returned, it will be the
+            protocol's responsibility to close/abort the transport.
+        :rtype: falsy|truthy
+        :raises Exception: Exception-based exception on error
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def data_received(self, data):
+        """Called to deliver incoming data to the protocol.
+
+        :param data: Non-empty data bytes.
+        :raises Exception: Exception-based exception on error
+        """
+        raise NotImplementedError
+
+    # pylint: disable=W0511
+    # TODO Undecided whether we need write flow-control yet, although it seems
+    #      like a good idea.
+    # @abc.abstractmethod
+    # def pause_writing(self):
+    #     """Called when the transport's write buffer size becomes greater than or
+    #     equal to the transport's high-water mark. It won't be called again until
+    #     the transport's write buffer gets back to its low-water mark and then
+    #     returns to/past the hight-water mark again.
+    #     """
+    #     raise NotImplementedError
+    #
+    # @abc.abstractmethod
+    # def resume_writing(self):
+    #     """Called when the transport's write buffer size becomes less than or
+    #     equal to the transport's low-water mark.
+    #     """
+    #     raise NotImplementedError
+
+
+class AbstractStreamTransport(pika.compat.AbstractBase):
+    """Stream transport interface. It's compatible with a subset of
+    `asyncio.transports.Transport` for compatibility with asyncio-based
+    `AbstractIOServices` implementation.
+
+    """
+
+    @abc.abstractmethod
+    def abort(self):
+        """Close connection abruptly without waiting for pending I/O to
+        complete. Will invoke the corresponding protocol's `connection_lost()`
+        method asynchronously (not in context of the abort() call).
+
+        :raises Exception: Exception-based exception on error
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def get_protocol(self):
+        """Return the protocol linked to this transport.
+
+        :rtype: AbstractStreamProtocol
+        :raises Exception: Exception-based exception on error
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def write(self, data):
+        """Buffer the given data until it can be sent asynchronously.
+
+        :param bytes data:
+        :raises ValueError: if called with empty data
+        :raises Exception: Exception-based exception on error
+        """
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def get_write_buffer_size(self):
+        """
+        :returns: Current size of output data buffered by the transport
+        :rtype: int
+        """
+        raise NotImplementedError
+
+    # pylint: disable=W0511
+    # TODO Udecided whether we need write flow-control yet, although it seems
+    #      like a good idea.
+    # @abc.abstractmethod
+    # def set_write_buffer_limits(self, high, low):
+    #     """Set thresholds for calling the protocol's `pause_writing()`
+    #     and `resume_writing()` methods. `low` must be less than or equal to
+    #     `high`.
+    #
+    #     NOTE The unintuitive order of the args is preserved to match the
+    #     corresponding method in `asyncio.WriteTransport`. I would expect `low`
+    #     to be the first arg, especially since
+    #     `asyncio.WriteTransport.get_write_buffer_limits()` returns them in the
+    #     opposite order. This seems error-prone.
+    #
+    #     See `asyncio.WriteTransport.get_write_buffer_limits()` for more details
+    #     about the args.
+    #
+    #     :param int high: non-negative high-water mark.
+    #     :param int low: non-negative low-water mark.
+    #     """
+    #     raise NotImplementedError

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/adapters/utils/selector_ioloop_adapter.py

@@ -0,0 +1,600 @@
+"""
+Implementation of `nbio_interface.AbstractIOServices` on top of a
+selector-based I/O loop, such as tornado's and our home-grown
+select_connection's I/O loops.
+
+"""
+import abc
+import logging
+import socket
+import threading
+
+from pika.adapters.utils import nbio_interface, io_services_utils
+from pika.adapters.utils.io_services_utils import (check_callback_arg,
+                                                   check_fd_arg)
+
+LOGGER = logging.getLogger(__name__)
+
+
+class AbstractSelectorIOLoop(object):
+    """Selector-based I/O loop interface expected by
+    `selector_ioloop_adapter.SelectorIOServicesAdapter`
+
+    NOTE: this interface follows the corresponding methods and attributes
+     of `tornado.ioloop.IOLoop` in order to avoid additional adapter layering
+     when wrapping tornado's IOLoop.
+    """
+
+    @property
+    @abc.abstractmethod
+    def READ(self):  # pylint: disable=C0103
+        """The value of the I/O loop's READ flag; READ/WRITE/ERROR may be used
+        with bitwise operators as expected.
+
+        Implementation note: the implementations can simply replace these
+        READ/WRITE/ERROR properties with class-level attributes
+
+        """
+
+    @property
+    @abc.abstractmethod
+    def WRITE(self):  # pylint: disable=C0103
+        """The value of the I/O loop's WRITE flag; READ/WRITE/ERROR may be used
+        with bitwise operators as expected
+
+        """
+
+    @property
+    @abc.abstractmethod
+    def ERROR(self):  # pylint: disable=C0103
+        """The value of the I/O loop's ERROR flag; READ/WRITE/ERROR may be used
+        with bitwise operators as expected
+
+        """
+
+    @abc.abstractmethod
+    def close(self):
+        """Release IOLoop's resources.
+
+        the `close()` method is intended to be called by the application or test
+        code only after `start()` returns. After calling `close()`, no other
+        interaction with the closed instance of `IOLoop` should be performed.
+
+        """
+
+    @abc.abstractmethod
+    def start(self):
+        """Run the I/O loop. It will loop until requested to exit. See `stop()`.
+
+        """
+
+    @abc.abstractmethod
+    def stop(self):
+        """Request exit from the ioloop. The loop is NOT guaranteed to
+        stop before this method returns.
+
+        To invoke `stop()` safely from a thread other than this IOLoop's thread,
+        call it via `add_callback_threadsafe`; e.g.,
+
+            `ioloop.add_callback(ioloop.stop)`
+
+        """
+
+    @abc.abstractmethod
+    def call_later(self, delay, callback):
+        """Add the callback to the IOLoop timer to be called after delay seconds
+        from the time of call on best-effort basis. Returns a handle to the
+        timeout.
+
+        :param float delay: The number of seconds to wait to call callback
+        :param callable callback: The callback method
+        :returns: handle to the created timeout that may be passed to
+            `remove_timeout()`
+        :rtype: object
+
+        """
+
+    @abc.abstractmethod
+    def remove_timeout(self, timeout_handle):
+        """Remove a timeout
+
+        :param timeout_handle: Handle of timeout to remove
+
+        """
+
+    @abc.abstractmethod
+    def add_callback(self, callback):
+        """Requests a call to the given function as soon as possible in the
+        context of this IOLoop's thread.
+
+        NOTE: This is the only thread-safe method in IOLoop. All other
+        manipulations of IOLoop must be performed from the IOLoop's thread.
+
+        For example, a thread may request a call to the `stop` method of an
+        ioloop that is running in a different thread via
+        `ioloop.add_callback_threadsafe(ioloop.stop)`
+
+        :param callable callback: The callback method
+
+        """
+
+    @abc.abstractmethod
+    def add_handler(self, fd, handler, events):
+        """Start watching the given file descriptor for events
+
+        :param int fd: The file descriptor
+        :param callable handler: When requested event(s) occur,
+            `handler(fd, events)` will be called.
+        :param int events: The event mask using READ, WRITE, ERROR.
+
+        """
+
+    @abc.abstractmethod
+    def update_handler(self, fd, events):
+        """Changes the events we watch for
+
+        :param int fd: The file descriptor
+        :param int events: The event mask using READ, WRITE, ERROR
+
+        """
+
+    @abc.abstractmethod
+    def remove_handler(self, fd):
+        """Stop watching the given file descriptor for events
+
+        :param int fd: The file descriptor
+
+        """
+
+
+class SelectorIOServicesAdapter(io_services_utils.SocketConnectionMixin,
+                                io_services_utils.StreamingConnectionMixin,
+                                nbio_interface.AbstractIOServices,
+                                nbio_interface.AbstractFileDescriptorServices):
+    """Implements the
+    :py:class:`.nbio_interface.AbstractIOServices` interface
+    on top of selector-style native loop having the
+    :py:class:`AbstractSelectorIOLoop` interface, such as
+    :py:class:`pika.selection_connection.IOLoop` and :py:class:`tornado.IOLoop`.
+
+    NOTE:
+    :py:class:`.nbio_interface.AbstractFileDescriptorServices`
+    interface is only required by the mixins.
+
+    """
+
+    def __init__(self, native_loop):
+        """
+        :param AbstractSelectorIOLoop native_loop: An instance compatible with
+            the `AbstractSelectorIOLoop` interface, but not necessarily derived
+            from it.
+        """
+        self._loop = native_loop
+
+        # Active watchers: maps file descriptors to `_FileDescriptorCallbacks`
+        self._watchers = dict()
+
+        # Native loop-specific event masks of interest
+        self._readable_mask = self._loop.READ
+        # NOTE: tying ERROR to WRITE is particularly handy for Windows, whose
+        # `select.select()` differs from Posix by reporting
+        # connection-establishment failure only through exceptfds (ERROR event),
+        # while the typical application workflow is to wait for the socket to
+        # become writable when waiting for socket connection to be established.
+        self._writable_mask = self._loop.WRITE | self._loop.ERROR
+
+    def get_native_ioloop(self):
+        """Implement
+        :py:meth:`.nbio_interface.AbstractIOServices.get_native_ioloop()`.
+
+        """
+        return self._loop
+
+    def close(self):
+        """Implement :py:meth:`.nbio_interface.AbstractIOServices.close()`.
+
+        """
+        self._loop.close()
+
+    def run(self):
+        """Implement :py:meth:`.nbio_interface.AbstractIOServices.run()`.
+
+        """
+        self._loop.start()
+
+    def stop(self):
+        """Implement :py:meth:`.nbio_interface.AbstractIOServices.stop()`.
+
+        """
+        self._loop.stop()
+
+    def add_callback_threadsafe(self, callback):
+        """Implement
+        :py:meth:`.nbio_interface.AbstractIOServices.add_callback_threadsafe()`.
+
+        """
+        self._loop.add_callback(callback)
+
+    def call_later(self, delay, callback):
+        """Implement :py:meth:`.nbio_interface.AbstractIOServices.call_later()`.
+
+        """
+        return _TimerHandle(self._loop.call_later(delay, callback), self._loop)
+
+    def getaddrinfo(self,
+                    host,
+                    port,
+                    on_done,
+                    family=0,
+                    socktype=0,
+                    proto=0,
+                    flags=0):
+        """Implement :py:meth:`.nbio_interface.AbstractIOServices.getaddrinfo()`.
+
+        """
+        return _SelectorIOLoopIOHandle(
+            _AddressResolver(
+                native_loop=self._loop,
+                host=host,
+                port=port,
+                family=family,
+                socktype=socktype,
+                proto=proto,
+                flags=flags,
+                on_done=on_done).start())
+
+    def set_reader(self, fd, on_readable):
+        """Implement
+        :py:meth:`.nbio_interface.AbstractFileDescriptorServices.set_reader()`.
+
+        """
+        LOGGER.debug('SelectorIOServicesAdapter.set_reader(%s, %r)', fd,
+                     on_readable)
+
+        check_fd_arg(fd)
+        check_callback_arg(on_readable, 'on_readable')
+
+        try:
+            callbacks = self._watchers[fd]
+        except KeyError:
+            self._loop.add_handler(fd, self._on_reader_writer_fd_events,
+                                   self._readable_mask)
+            self._watchers[fd] = _FileDescriptorCallbacks(reader=on_readable)
+            LOGGER.debug('set_reader(%s, _) added handler Rd', fd)
+        else:
+            if callbacks.reader is None:
+                assert callbacks.writer is not None
+                self._loop.update_handler(
+                    fd, self._readable_mask | self._writable_mask)
+                LOGGER.debug('set_reader(%s, _) updated handler RdWr', fd)
+            else:
+                LOGGER.debug('set_reader(%s, _) replacing reader', fd)
+
+            callbacks.reader = on_readable
+
+    def remove_reader(self, fd):
+        """Implement
+        :py:meth:`.nbio_interface.AbstractFileDescriptorServices.remove_reader()`.
+
+        """
+        LOGGER.debug('SelectorIOServicesAdapter.remove_reader(%s)', fd)
+
+        check_fd_arg(fd)
+
+        try:
+            callbacks = self._watchers[fd]
+        except KeyError:
+            LOGGER.debug('remove_reader(%s) neither was set', fd)
+            return False
+
+        if callbacks.reader is None:
+            assert callbacks.writer is not None
+            LOGGER.debug('remove_reader(%s) reader wasn\'t set Wr', fd)
+            return False
+
+        callbacks.reader = None
+
+        if callbacks.writer is None:
+            del self._watchers[fd]
+            self._loop.remove_handler(fd)
+            LOGGER.debug('remove_reader(%s) removed handler', fd)
+        else:
+            self._loop.update_handler(fd, self._writable_mask)
+            LOGGER.debug('remove_reader(%s) updated handler Wr', fd)
+
+        return True
+
+    def set_writer(self, fd, on_writable):
+        """Implement
+        :py:meth:`.nbio_interface.AbstractFileDescriptorServices.set_writer()`.
+
+        """
+        LOGGER.debug('SelectorIOServicesAdapter.set_writer(%s, %r)', fd,
+                     on_writable)
+
+        check_fd_arg(fd)
+        check_callback_arg(on_writable, 'on_writable')
+
+        try:
+            callbacks = self._watchers[fd]
+        except KeyError:
+            self._loop.add_handler(fd, self._on_reader_writer_fd_events,
+                                   self._writable_mask)
+            self._watchers[fd] = _FileDescriptorCallbacks(writer=on_writable)
+            LOGGER.debug('set_writer(%s, _) added handler Wr', fd)
+        else:
+            if callbacks.writer is None:
+                assert callbacks.reader is not None
+                # NOTE: Set the writer func before setting the mask!
+                # Otherwise a race condition can occur where ioloop tries to
+                # call writer when it is still None.
+                callbacks.writer = on_writable
+                self._loop.update_handler(
+                    fd, self._readable_mask | self._writable_mask)
+                LOGGER.debug('set_writer(%s, _) updated handler RdWr', fd)
+            else:
+                LOGGER.debug('set_writer(%s, _) replacing writer', fd)
+                callbacks.writer = on_writable
+
+    def remove_writer(self, fd):
+        """Implement
+        :py:meth:`.nbio_interface.AbstractFileDescriptorServices.remove_writer()`.
+
+        """
+        LOGGER.debug('SelectorIOServicesAdapter.remove_writer(%s)', fd)
+
+        check_fd_arg(fd)
+
+        try:
+            callbacks = self._watchers[fd]
+        except KeyError:
+            LOGGER.debug('remove_writer(%s) neither was set.', fd)
+            return False
+
+        if callbacks.writer is None:
+            assert callbacks.reader is not None
+            LOGGER.debug('remove_writer(%s) writer wasn\'t set Rd', fd)
+            return False
+
+        callbacks.writer = None
+
+        if callbacks.reader is None:
+            del self._watchers[fd]
+            self._loop.remove_handler(fd)
+            LOGGER.debug('remove_writer(%s) removed handler', fd)
+        else:
+            self._loop.update_handler(fd, self._readable_mask)
+            LOGGER.debug('remove_writer(%s) updated handler Rd', fd)
+
+        return True
+
+    def _on_reader_writer_fd_events(self, fd, events):
+        """Handle indicated file descriptor events requested via `set_reader()`
+        and `set_writer()`.
+
+        :param fd: file descriptor
+        :param events: event mask using native loop's READ/WRITE/ERROR. NOTE:
+            depending on the underlying poller mechanism, ERROR may be indicated
+            upon certain file description state even though we don't request it.
+            We ignore ERROR here since `set_reader()`/`set_writer()` don't
+            request for it.
+        """
+        callbacks = self._watchers[fd]
+
+        if events & self._readable_mask and callbacks.reader is None:
+            # NOTE: we check for consistency here ahead of the writer callback
+            # because the writer callback, if any, can change the events being
+            # watched
+            LOGGER.warning(
+                'READ indicated on fd=%s, but reader callback is None; '
+                'events=%s', fd, bin(events))
+
+        if events & self._writable_mask:
+            if callbacks.writer is not None:
+                callbacks.writer()
+            else:
+                LOGGER.warning(
+                    'WRITE indicated on fd=%s, but writer callback is None; '
+                    'events=%s', fd, bin(events))
+
+        if events & self._readable_mask:
+            if callbacks.reader is not None:
+                callbacks.reader()
+            else:
+                # Reader callback might have been removed in the scope of writer
+                # callback.
+                pass
+
+
+class _FileDescriptorCallbacks(object):
+    """Holds reader and writer callbacks for a file descriptor"""
+
+    __slots__ = ('reader', 'writer')
+
+    def __init__(self, reader=None, writer=None):
+
+        self.reader = reader
+        self.writer = writer
+
+
+class _TimerHandle(nbio_interface.AbstractTimerReference):
+    """This module's adaptation of `nbio_interface.AbstractTimerReference`.
+
+    """
+
+    def __init__(self, handle, loop):
+        """
+
+        :param opaque handle: timer handle from the underlying loop
+            implementation that may be passed to its `remove_timeout()` method
+        :param AbstractSelectorIOLoop loop: the I/O loop instance that created
+            the timeout.
+        """
+        self._handle = handle
+        self._loop = loop
+
+    def cancel(self):
+        if self._loop is not None:
+            self._loop.remove_timeout(self._handle)
+            self._handle = None
+            self._loop = None
+
+
+class _SelectorIOLoopIOHandle(nbio_interface.AbstractIOReference):
+    """This module's adaptation of `nbio_interface.AbstractIOReference`
+
+    """
+
+    def __init__(self, subject):
+        """
+        :param subject: subject of the reference containing a `cancel()` method
+
+        """
+        self._cancel = subject.cancel
+
+    def cancel(self):
+        """Cancel pending operation
+
+        :returns: False if was already done or cancelled; True otherwise
+        :rtype: bool
+
+        """
+        return self._cancel()
+
+
+class _AddressResolver(object):
+    """Performs getaddrinfo asynchronously using a thread, then reports result
+    via callback from the given I/O loop.
+
+    NOTE: at this stage, we're using a thread per request, which may prove
+    inefficient and even prohibitive if the app performs many of these
+    operations concurrently.
+    """
+    NOT_STARTED = 0
+    ACTIVE = 1
+    CANCELED = 2
+    COMPLETED = 3
+
+    def __init__(self, native_loop, host, port, family, socktype, proto, flags,
+                 on_done):
+        """
+
+        :param AbstractSelectorIOLoop native_loop:
+        :param host: `see socket.getaddrinfo()`
+        :param port: `see socket.getaddrinfo()`
+        :param family: `see socket.getaddrinfo()`
+        :param socktype: `see socket.getaddrinfo()`
+        :param proto: `see socket.getaddrinfo()`
+        :param flags: `see socket.getaddrinfo()`
+        :param on_done: on_done(records|BaseException) callback for reporting
+            result from the given I/O loop. The single arg will be either an
+            exception object (check for `BaseException`) in case of failure or
+            the result returned by `socket.getaddrinfo()`.
+        """
+        check_callback_arg(on_done, 'on_done')
+
+        self._state = self.NOT_STARTED
+        self._result = None
+        self._loop = native_loop
+        self._host = host
+        self._port = port
+        self._family = family
+        self._socktype = socktype
+        self._proto = proto
+        self._flags = flags
+        self._on_done = on_done
+
+        self._mutex = threading.Lock()
+        self._threading_timer = None
+
+    def _cleanup(self):
+        """Release resources
+
+        """
+        self._loop = None
+        self._threading_timer = None
+        self._on_done = None
+
+    def start(self):
+        """Start asynchronous DNS lookup.
+
+        :rtype: nbio_interface.AbstractIOReference
+
+        """
+        assert self._state == self.NOT_STARTED, self._state
+
+        self._state = self.ACTIVE
+        self._threading_timer = threading.Timer(0, self._resolve)
+        self._threading_timer.start()
+
+        return _SelectorIOLoopIOHandle(self)
+
+    def cancel(self):
+        """Cancel the pending resolver
+
+        :returns: False if was already done or cancelled; True otherwise
+        :rtype: bool
+
+        """
+        # Try to cancel, but no guarantees
+        with self._mutex:
+            if self._state == self.ACTIVE:
+                LOGGER.debug('Canceling resolver for %s:%s', self._host,
+                             self._port)
+                self._state = self.CANCELED
+
+                # Attempt to cancel, but not guaranteed
+                self._threading_timer.cancel()
+
+                self._cleanup()
+
+                return True
+            else:
+                LOGGER.debug(
+                    'Ignoring _AddressResolver cancel request when not ACTIVE; '
+                    '(%s:%s); state=%s', self._host, self._port, self._state)
+                return False
+
+    def _resolve(self):
+        """Call `socket.getaddrinfo()` and return result via user's callback
+        function on the given I/O loop
+
+        """
+        try:
+            # NOTE: on python 2.x, can't pass keyword args to getaddrinfo()
+            result = socket.getaddrinfo(self._host, self._port, self._family,
+                                        self._socktype, self._proto,
+                                        self._flags)
+        except Exception as exc:  # pylint: disable=W0703
+            LOGGER.error('Address resolution failed: %r', exc)
+            result = exc
+
+        self._result = result
+
+        # Schedule result to be returned to user via user's event loop
+        with self._mutex:
+            if self._state == self.ACTIVE:
+                self._loop.add_callback(self._dispatch_result)
+            else:
+                LOGGER.debug(
+                    'Asynchronous getaddrinfo cancellation detected; '
+                    'in thread; host=%r', self._host)
+
+    def _dispatch_result(self):
+        """This is called from the user's I/O loop to pass the result to the
+         user via the user's on_done callback
+
+        """
+        if self._state == self.ACTIVE:
+            self._state = self.COMPLETED
+            try:
+                LOGGER.debug(
+                    'Invoking asynchronous getaddrinfo() completion callback; '
+                    'host=%r', self._host)
+                self._on_done(self._result)
+            finally:
+                self._cleanup()
+        else:
+            LOGGER.debug(
+                'Asynchronous getaddrinfo cancellation detected; '
+                'in I/O loop context; host=%r', self._host)

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/amqp_object.py

@@ -0,0 +1,71 @@
+"""Base classes that are extended by low level AMQP frames and higher level
+AMQP classes and methods.
+
+"""
+
+
+class AMQPObject(object):
+    """Base object that is extended by AMQP low level frames and AMQP classes
+    and methods.
+
+    """
+    NAME = 'AMQPObject'
+    INDEX = None
+
+    def __repr__(self):
+        items = list()
+        for key, value in self.__dict__.items():
+            if getattr(self.__class__, key, None) != value:
+                items.append('%s=%s' % (key, value))
+        if not items:
+            return "<%s>" % self.NAME
+        return "<%s(%s)>" % (self.NAME, sorted(items))
+
+    def __eq__(self, other):
+        if other is not None:
+            return self.__dict__ == other.__dict__
+        else:
+            return False
+
+
+class Class(AMQPObject):
+    """Is extended by AMQP classes"""
+    NAME = 'Unextended Class'
+
+
+class Method(AMQPObject):
+    """Is extended by AMQP methods"""
+    NAME = 'Unextended Method'
+    synchronous = False
+
+    def _set_content(self, properties, body):
+        """If the method is a content frame, set the properties and body to
+        be carried as attributes of the class.
+
+        :param pika.frame.Properties properties: AMQP Basic Properties
+        :param bytes body: The message body
+
+        """
+        self._properties = properties  # pylint: disable=W0201
+        self._body = body  # pylint: disable=W0201
+
+    def get_properties(self):
+        """Return the properties if they are set.
+
+        :rtype: pika.frame.Properties
+
+        """
+        return self._properties
+
+    def get_body(self):
+        """Return the message body if it is set.
+
+        :rtype: str|unicode
+
+        """
+        return self._body
+
+
+class Properties(AMQPObject):
+    """Class to encompass message properties (AMQP Basic.Properties)"""
+    NAME = 'Unextended Properties'

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/callback.py

@@ -0,0 +1,407 @@
+"""Callback management class, common area for keeping track of all callbacks in
+the Pika stack.
+
+"""
+import functools
+import logging
+
+from pika import frame
+from pika import amqp_object
+from pika.compat import xrange, canonical_str
+
+LOGGER = logging.getLogger(__name__)
+
+
+def name_or_value(value):
+    """Will take Frame objects, classes, etc and attempt to return a valid
+    string identifier for them.
+
+    :param pika.amqp_object.AMQPObject|pika.frame.Frame|int|str value: The
+        value to sanitize
+    :rtype: str
+
+    """
+    # Is it subclass of AMQPObject
+    try:
+        if issubclass(value, amqp_object.AMQPObject):
+            return value.NAME
+    except TypeError:
+        pass
+
+    # Is it a Pika frame object?
+    if isinstance(value, frame.Method):
+        return value.method.NAME
+
+    # Is it a Pika frame object (go after Method since Method extends this)
+    if isinstance(value, amqp_object.AMQPObject):
+        return value.NAME
+
+    # Cast the value to a str (python 2 and python 3); encoding as UTF-8 on Python 2
+    return canonical_str(value)
+
+
+def sanitize_prefix(function):
+    """Automatically call name_or_value on the prefix passed in."""
+
+    @functools.wraps(function)
+    def wrapper(*args, **kwargs):
+        args = list(args)
+        offset = 1
+        if 'prefix' in kwargs:
+            kwargs['prefix'] = name_or_value(kwargs['prefix'])
+        elif len(args) - 1 >= offset:
+            args[offset] = name_or_value(args[offset])
+            offset += 1
+        if 'key' in kwargs:
+            kwargs['key'] = name_or_value(kwargs['key'])
+        elif len(args) - 1 >= offset:
+            args[offset] = name_or_value(args[offset])
+
+        return function(*tuple(args), **kwargs)
+
+    return wrapper
+
+
+def check_for_prefix_and_key(function):
+    """Automatically return false if the key or prefix is not in the callbacks
+    for the instance.
+
+    """
+
+    @functools.wraps(function)
+    def wrapper(*args, **kwargs):
+        offset = 1
+        # Sanitize the prefix
+        if 'prefix' in kwargs:
+            prefix = name_or_value(kwargs['prefix'])
+        else:
+            prefix = name_or_value(args[offset])
+            offset += 1
+
+        # Make sure to sanitize the key as well
+        if 'key' in kwargs:
+            key = name_or_value(kwargs['key'])
+        else:
+            key = name_or_value(args[offset])
+
+        # Make sure prefix and key are in the stack
+        if prefix not in args[0]._stack or key not in args[0]._stack[prefix]:  # pylint: disable=W0212
+            return False
+
+        # Execute the method
+        return function(*args, **kwargs)
+
+    return wrapper
+
+
+class CallbackManager(object):
+    """CallbackManager is a global callback system designed to be a single place
+    where Pika can manage callbacks and process them. It should be referenced
+    by the CallbackManager.instance() method instead of constructing new
+    instances of it.
+
+    """
+    CALLS = 'calls'
+    ARGUMENTS = 'arguments'
+    DUPLICATE_WARNING = 'Duplicate callback found for "%s:%s"'
+    CALLBACK = 'callback'
+    ONE_SHOT = 'one_shot'
+    ONLY_CALLER = 'only'
+
+    def __init__(self):
+        """Create an instance of the CallbackManager"""
+        self._stack = dict()
+
+    @sanitize_prefix
+    def add(self,
+            prefix,
+            key,
+            callback,
+            one_shot=True,
+            only_caller=None,
+            arguments=None):
+        """Add a callback to the stack for the specified key. If the call is
+        specified as one_shot, it will be removed after being fired
+
+        The prefix is usually the channel number but the class is generic
+        and prefix and key may be any value. If you pass in only_caller
+        CallbackManager will restrict processing of the callback to only
+        the calling function/object that you specify.
+
+        :param str|int prefix: Categorize the callback
+        :param str|dict key: The key for the callback
+        :param callable callback: The callback to call
+        :param bool one_shot: Remove this callback after it is called
+        :param object only_caller: Only allow one_caller value to call the
+                                   event that fires the callback.
+        :param dict arguments: Arguments to validate when processing
+        :rtype: tuple(prefix, key)
+
+        """
+        # Prep the stack
+        if prefix not in self._stack:
+            self._stack[prefix] = dict()
+
+        if key not in self._stack[prefix]:
+            self._stack[prefix][key] = list()
+
+        # Check for a duplicate
+        for callback_dict in self._stack[prefix][key]:
+            if (callback_dict[self.CALLBACK] == callback and
+                    callback_dict[self.ARGUMENTS] == arguments and
+                    callback_dict[self.ONLY_CALLER] == only_caller):
+                if callback_dict[self.ONE_SHOT] is True:
+                    callback_dict[self.CALLS] += 1
+                    LOGGER.debug('Incremented callback reference counter: %r',
+                                 callback_dict)
+                else:
+                    LOGGER.warning(self.DUPLICATE_WARNING, prefix, key)
+                return prefix, key
+
+        # Create the callback dictionary
+        callback_dict = self._callback_dict(callback, one_shot, only_caller,
+                                            arguments)
+        self._stack[prefix][key].append(callback_dict)
+        LOGGER.debug('Added: %r', callback_dict)
+        return prefix, key
+
+    def clear(self):
+        """Clear all the callbacks if there are any defined."""
+        self._stack = dict()
+        LOGGER.debug('Callbacks cleared')
+
+    @sanitize_prefix
+    def cleanup(self, prefix):
+        """Remove all callbacks from the stack by a prefix. Returns True
+        if keys were there to be removed
+
+        :param str or int prefix: The prefix for keeping track of callbacks with
+        :rtype: bool
+
+        """
+        LOGGER.debug('Clearing out %r from the stack', prefix)
+        if prefix not in self._stack or not self._stack[prefix]:
+            return False
+        del self._stack[prefix]
+        return True
+
+    @sanitize_prefix
+    def pending(self, prefix, key):
+        """Return count of callbacks for a given prefix or key or None
+
+        :param str|int prefix: Categorize the callback
+        :param object|str|dict key: The key for the callback
+        :rtype: None or int
+
+        """
+        if not prefix in self._stack or not key in self._stack[prefix]:
+            return None
+        return len(self._stack[prefix][key])
+
+    @sanitize_prefix
+    @check_for_prefix_and_key
+    def process(self, prefix, key, caller, *args, **keywords):
+        """Run through and process all the callbacks for the specified keys.
+        Caller should be specified at all times so that callbacks which
+        require a specific function to call CallbackManager.process will
+        not be processed.
+
+        :param str|int prefix: Categorize the callback
+        :param object|str|int key: The key for the callback
+        :param object caller: Who is firing the event
+        :param list args: Any optional arguments
+        :param dict keywords: Optional keyword arguments
+        :rtype: bool
+
+        """
+        LOGGER.debug('Processing %s:%s', prefix, key)
+        if prefix not in self._stack or key not in self._stack[prefix]:
+            return False
+
+        callbacks = list()
+        # Check each callback, append it to the list if it should be called
+        for callback_dict in list(self._stack[prefix][key]):
+            if self._should_process_callback(callback_dict, caller, list(args)):
+                callbacks.append(callback_dict[self.CALLBACK])
+                if callback_dict[self.ONE_SHOT]:
+                    self._use_one_shot_callback(prefix, key, callback_dict)
+
+        # Call each callback
+        for callback in callbacks:
+            LOGGER.debug('Calling %s for "%s:%s"', callback, prefix, key)
+            try:
+                callback(*args, **keywords)
+            except:
+                LOGGER.exception('Calling %s for "%s:%s" failed', callback,
+                                 prefix, key)
+                raise
+        return True
+
+    @sanitize_prefix
+    @check_for_prefix_and_key
+    def remove(self, prefix, key, callback_value=None, arguments=None):
+        """Remove a callback from the stack by prefix, key and optionally
+        the callback itself. If you only pass in prefix and key, all
+        callbacks for that prefix and key will be removed.
+
+        :param str or int prefix: The prefix for keeping track of callbacks with
+        :param str key: The callback key
+        :param callable callback_value: The method defined to call on callback
+        :param dict arguments: Optional arguments to check
+        :rtype: bool
+
+        """
+        if callback_value:
+            offsets_to_remove = list()
+            for offset in xrange(len(self._stack[prefix][key]), 0, -1):
+                callback_dict = self._stack[prefix][key][offset - 1]
+
+                if (callback_dict[self.CALLBACK] == callback_value and
+                        self._arguments_match(callback_dict, [arguments])):
+                    offsets_to_remove.append(offset - 1)
+
+            for offset in offsets_to_remove:
+                try:
+                    LOGGER.debug('Removing callback #%i: %r', offset,
+                                 self._stack[prefix][key][offset])
+                    del self._stack[prefix][key][offset]
+                except KeyError:
+                    pass
+
+        self._cleanup_callback_dict(prefix, key)
+        return True
+
+    @sanitize_prefix
+    @check_for_prefix_and_key
+    def remove_all(self, prefix, key):
+        """Remove all callbacks for the specified prefix and key.
+
+        :param str prefix: The prefix for keeping track of callbacks with
+        :param str key: The callback key
+
+        """
+        del self._stack[prefix][key]
+        self._cleanup_callback_dict(prefix, key)
+
+    def _arguments_match(self, callback_dict, args):
+        """Validate if the arguments passed in match the expected arguments in
+        the callback_dict. We expect this to be a frame passed in to *args for
+        process or passed in as a list from remove.
+
+        :param dict callback_dict: The callback dictionary to evaluate against
+        :param list args: The arguments passed in as a list
+
+        """
+        if callback_dict[self.ARGUMENTS] is None:
+            return True
+        if not args:
+            return False
+        if isinstance(args[0], dict):
+            return self._dict_arguments_match(args[0],
+                                              callback_dict[self.ARGUMENTS])
+        return self._obj_arguments_match(
+            args[0].method if hasattr(args[0], 'method') else args[0],
+            callback_dict[self.ARGUMENTS])
+
+    def _callback_dict(self, callback, one_shot, only_caller, arguments):
+        """Return the callback dictionary.
+
+        :param callable callback: The callback to call
+        :param bool one_shot: Remove this callback after it is called
+        :param object only_caller: Only allow one_caller value to call the
+                                   event that fires the callback.
+        :rtype: dict
+
+        """
+        value = {
+            self.CALLBACK: callback,
+            self.ONE_SHOT: one_shot,
+            self.ONLY_CALLER: only_caller,
+            self.ARGUMENTS: arguments
+        }
+        if one_shot:
+            value[self.CALLS] = 1
+        return value
+
+    def _cleanup_callback_dict(self, prefix, key=None):
+        """Remove empty dict nodes in the callback stack.
+
+        :param str or int prefix: The prefix for keeping track of callbacks with
+        :param str key: The callback key
+
+        """
+        if key and key in self._stack[prefix] and not self._stack[prefix][key]:
+            del self._stack[prefix][key]
+        if prefix in self._stack and not self._stack[prefix]:
+            del self._stack[prefix]
+
+    @staticmethod
+    def _dict_arguments_match(value, expectation):
+        """Checks an dict to see if it has attributes that meet the expectation.
+
+        :param dict value: The dict to evaluate
+        :param dict expectation: The values to check against
+        :rtype: bool
+
+        """
+        LOGGER.debug('Comparing %r to %r', value, expectation)
+        for key in expectation:
+            if value.get(key) != expectation[key]:
+                LOGGER.debug('Values in dict do not match for %s', key)
+                return False
+        return True
+
+    @staticmethod
+    def _obj_arguments_match(value, expectation):
+        """Checks an object to see if it has attributes that meet the
+        expectation.
+
+        :param object value: The object to evaluate
+        :param dict expectation: The values to check against
+        :rtype: bool
+
+        """
+        for key in expectation:
+            if not hasattr(value, key):
+                LOGGER.debug('%r does not have required attribute: %s',
+                             type(value), key)
+                return False
+            if getattr(value, key) != expectation[key]:
+                LOGGER.debug('Values in %s do not match for %s', type(value),
+                             key)
+                return False
+        return True
+
+    def _should_process_callback(self, callback_dict, caller, args):
+        """Returns True if the callback should be processed.
+
+        :param dict callback_dict: The callback configuration
+        :param object caller: Who is firing the event
+        :param list args: Any optional arguments
+        :rtype: bool
+
+        """
+        if not self._arguments_match(callback_dict, args):
+            LOGGER.debug('Arguments do not match for %r, %r', callback_dict,
+                         args)
+            return False
+        return (callback_dict[self.ONLY_CALLER] is None or
+                (callback_dict[self.ONLY_CALLER] and
+                 callback_dict[self.ONLY_CALLER] == caller))
+
+    def _use_one_shot_callback(self, prefix, key, callback_dict):
+        """Process the one-shot callback, decrementing the use counter and
+        removing it from the stack if it's now been fully used.
+
+        :param str or int prefix: The prefix for keeping track of callbacks with
+        :param str key: The callback key
+        :param dict callback_dict: The callback dict to process
+
+        """
+        LOGGER.debug('Processing use of oneshot callback')
+        callback_dict[self.CALLS] -= 1
+        LOGGER.debug('%i registered uses left', callback_dict[self.CALLS])
+
+        if callback_dict[self.CALLS] <= 0:
+            self.remove(prefix, key, callback_dict[self.CALLBACK],
+                        callback_dict[self.ARGUMENTS])

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/compat.py

@@ -0,0 +1,261 @@
+"""The compat module provides various Python 2 / Python 3
+compatibility functions
+
+"""
+# pylint: disable=C0103
+
+import abc
+import os
+import platform
+import re
+import socket
+import sys as _sys
+import time
+
+PY2 = _sys.version_info.major == 2
+PY3 = not PY2
+RE_NUM = re.compile(r'(\d+).+')
+
+ON_LINUX = platform.system() == 'Linux'
+ON_OSX = platform.system() == 'Darwin'
+ON_WINDOWS = platform.system() == 'Windows'
+
+# Portable Abstract Base Class
+AbstractBase = abc.ABCMeta('AbstractBase', (object,), {})
+
+if _sys.version_info[:2] < (3, 3):
+    SOCKET_ERROR = socket.error
+else:
+    # socket.error was deprecated and replaced by OSError in python 3.3
+    SOCKET_ERROR = OSError
+
+try:
+    SOL_TCP = socket.SOL_TCP
+except AttributeError:
+    SOL_TCP = socket.IPPROTO_TCP
+
+if PY3:
+    # these were moved around for Python 3
+    # pylint: disable=W0611
+    from urllib.parse import (quote as url_quote, unquote as url_unquote,
+                              urlencode, parse_qs as url_parse_qs, urlparse)
+    from io import StringIO
+
+    # Python 3 does not have basestring anymore; we include
+    # *only* the str here as this is used for textual data.
+    basestring = (str,)
+
+    # for assertions that the data is either encoded or non-encoded text
+    str_or_bytes = (str, bytes)
+
+    # xrange is gone, replace it with range
+    xrange = range
+
+    # the unicode type is str
+    unicode_type = str
+
+    def time_now():
+        """
+        Python 3 supports monotonic time
+        """
+        return time.monotonic()
+
+    def dictkeys(dct):
+        """
+        Returns a list of keys of dictionary
+
+        dict.keys returns a view that works like .keys in Python 2
+        *except* any modifications in the dictionary will be visible
+        (and will cause errors if the view is being iterated over while
+        it is modified).
+        """
+
+        return list(dct.keys())
+
+    def dictvalues(dct):
+        """
+        Returns a list of values of a dictionary
+
+        dict.values returns a view that works like .values in Python 2
+        *except* any modifications in the dictionary will be visible
+        (and will cause errors if the view is being iterated over while
+        it is modified).
+        """
+        return list(dct.values())
+
+    def dict_iteritems(dct):
+        """
+        Returns an iterator of items (key/value pairs) of a dictionary
+
+        dict.items returns a view that works like .items in Python 2
+        *except* any modifications in the dictionary will be visible
+        (and will cause errors if the view is being iterated over while
+        it is modified).
+        """
+        return dct.items()
+
+    def dict_itervalues(dct):
+        """
+        :param dict dct:
+        :returns: an iterator of the values of a dictionary
+        :rtype: iterator
+        """
+        return dct.values()
+
+    def byte(*args):
+        """
+        This is the same as Python 2 `chr(n)` for bytes in Python 3
+
+        Returns a single byte `bytes` for the given int argument (we
+        optimize it a bit here by passing the positional argument tuple
+        directly to the bytes constructor.
+        """
+        return bytes(args)
+
+    class long(int):
+        """
+        A marker class that signifies that the integer value should be
+        serialized as `l` instead of `I`
+        """
+
+        def __str__(self):
+            return str(int(self))
+
+        def __repr__(self):
+            return str(self) + 'L'
+
+    def canonical_str(value):
+        """
+        Return the canonical str value for the string.
+        In both Python 3 and Python 2 this is str.
+        """
+
+        return str(value)
+
+    def is_integer(value):
+        """
+        Is value an integer?
+        """
+        return isinstance(value, int)
+else:
+    from urllib import (quote as url_quote, unquote as url_unquote, urlencode) # pylint: disable=C0412,E0611
+    from urlparse import (parse_qs as url_parse_qs, urlparse) # pylint: disable=E0401
+    from StringIO import StringIO # pylint: disable=E0401
+
+    basestring = basestring
+    str_or_bytes = basestring
+    xrange = xrange
+    unicode_type = unicode # pylint: disable=E0602
+    dictkeys = dict.keys
+    dictvalues = dict.values
+    dict_iteritems = dict.iteritems # pylint: disable=E1101
+    dict_itervalues = dict.itervalues # pylint: disable=E1101
+    byte = chr
+    long = long
+
+    def time_now():
+        """
+        Python 2 does not support monotonic time
+        """
+        return time.time()
+
+    def canonical_str(value):
+        """
+        Returns the canonical string value of the given string.
+        In Python 2 this is the value unchanged if it is an str, otherwise
+        it is the unicode value encoded as UTF-8.
+        """
+
+        try:
+            return str(value)
+        except UnicodeEncodeError:
+            return str(value.encode('utf-8'))
+
+    def is_integer(value):
+        """
+        Is value an integer?
+        """
+        return isinstance(value, (int, long))
+
+
+def as_bytes(value):
+    """
+    Returns value as bytes
+    """
+    if not isinstance(value, bytes):
+        return value.encode('UTF-8')
+    return value
+
+
+def to_digit(value):
+    """
+    Returns value as in integer
+    """
+    if value.isdigit():
+        return int(value)
+    match = RE_NUM.match(value)
+    return int(match.groups()[0]) if match else 0
+
+
+def get_linux_version(release_str):
+    """
+    Gets linux version
+    """
+    ver_str = release_str.split('-')[0]
+    return tuple(map(to_digit, ver_str.split('.')[:3]))
+
+
+HAVE_SIGNAL = os.name == 'posix'
+
+EINTR_IS_EXPOSED = _sys.version_info[:2] <= (3, 4)
+
+LINUX_VERSION = None
+if platform.system() == 'Linux':
+    LINUX_VERSION = get_linux_version(platform.release())
+
+_LOCALHOST = '127.0.0.1'
+_LOCALHOST_V6 = '::1'
+
+
+def _nonblocking_socketpair(family=socket.AF_INET,
+                            socket_type=socket.SOCK_STREAM,
+                            proto=0):
+    """
+    Returns a pair of sockets in the manner of socketpair with the additional
+    feature that they will be non-blocking. Prior to Python 3.5, socketpair
+    did not exist on Windows at all.
+    """
+    if family == socket.AF_INET:
+        host = _LOCALHOST
+    elif family == socket.AF_INET6:
+        host = _LOCALHOST_V6
+    else:
+        raise ValueError('Only AF_INET and AF_INET6 socket address families '
+                         'are supported')
+    if socket_type != socket.SOCK_STREAM:
+        raise ValueError('Only SOCK_STREAM socket socket_type is supported')
+    if proto != 0:
+        raise ValueError('Only protocol zero is supported')
+
+    lsock = socket.socket(family, socket_type, proto)
+    try:
+        lsock.bind((host, 0))
+        lsock.listen(min(socket.SOMAXCONN, 128))
+        # On IPv6, ignore flow_info and scope_id
+        addr, port = lsock.getsockname()[:2]
+        csock = socket.socket(family, socket_type, proto)
+        try:
+            csock.connect((addr, port))
+            ssock, _ = lsock.accept()
+        except Exception:
+            csock.close()
+            raise
+    finally:
+        lsock.close()
+
+    # Make sockets non-blocking to prevent deadlocks
+    # See https://github.com/pika/pika/issues/917
+    csock.setblocking(False)
+    ssock.setblocking(False)
+
+    return ssock, csock

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/credentials.py

@@ -0,0 +1,129 @@
+"""The credentials classes are used to encapsulate all authentication
+information for the :class:`~pika.connection.ConnectionParameters` class.
+
+The :class:`~pika.credentials.PlainCredentials` class returns the properly
+formatted username and password to the :class:`~pika.connection.Connection`.
+
+To authenticate with Pika, create a :class:`~pika.credentials.PlainCredentials`
+object passing in the username and password and pass it as the credentials
+argument value to the :class:`~pika.connection.ConnectionParameters` object.
+
+If you are using :class:`~pika.connection.URLParameters` you do not need a
+credentials object, one will automatically be created for you.
+
+If you are looking to implement SSL certificate style authentication, you would
+extend the :class:`~pika.credentials.ExternalCredentials` class implementing
+the required behavior.
+
+"""
+import logging
+from .compat import as_bytes
+
+LOGGER = logging.getLogger(__name__)
+
+
+class PlainCredentials(object):
+    """A credentials object for the default authentication methodology with
+    RabbitMQ.
+
+    If you do not pass in credentials to the ConnectionParameters object, it
+    will create credentials for 'guest' with the password of 'guest'.
+
+    If you pass True to erase_on_connect the credentials will not be stored
+    in memory after the Connection attempt has been made.
+
+    :param str username: The username to authenticate with
+    :param str password: The password to authenticate with
+    :param bool erase_on_connect: erase credentials on connect.
+
+    """
+    TYPE = 'PLAIN'
+
+    def __init__(self, username, password, erase_on_connect=False):
+        """Create a new instance of PlainCredentials
+
+        :param str username: The username to authenticate with
+        :param str password: The password to authenticate with
+        :param bool erase_on_connect: erase credentials on connect.
+
+        """
+        self.username = username
+        self.password = password
+        self.erase_on_connect = erase_on_connect
+
+    def __eq__(self, other):
+        if isinstance(other, PlainCredentials):
+            return (self.username == other.username and
+                    self.password == other.password and
+                    self.erase_on_connect == other.erase_on_connect)
+        return NotImplemented
+
+    def __ne__(self, other):
+        result = self.__eq__(other)
+        if result is not NotImplemented:
+            return not result
+        return NotImplemented
+
+    def response_for(self, start):
+        """Validate that this type of authentication is supported
+
+        :param spec.Connection.Start start: Connection.Start method
+        :rtype: tuple(str|None, str|None)
+
+        """
+        if as_bytes(PlainCredentials.TYPE) not in\
+                as_bytes(start.mechanisms).split():
+            return None, None
+        return (
+            PlainCredentials.TYPE,
+            b'\0' + as_bytes(self.username) + b'\0' + as_bytes(self.password))
+
+    def erase_credentials(self):
+        """Called by Connection when it no longer needs the credentials"""
+        if self.erase_on_connect:
+            LOGGER.info("Erasing stored credential values")
+            self.username = None
+            self.password = None
+
+
+class ExternalCredentials(object):
+    """The ExternalCredentials class allows the connection to use EXTERNAL
+    authentication, generally with a client SSL certificate.
+
+    """
+    TYPE = 'EXTERNAL'
+
+    def __init__(self):
+        """Create a new instance of ExternalCredentials"""
+        self.erase_on_connect = False
+
+    def __eq__(self, other):
+        if isinstance(other, ExternalCredentials):
+            return self.erase_on_connect == other.erase_on_connect
+        return NotImplemented
+
+    def __ne__(self, other):
+        result = self.__eq__(other)
+        if result is not NotImplemented:
+            return not result
+        return NotImplemented
+
+    def response_for(self, start):  # pylint: disable=R0201
+        """Validate that this type of authentication is supported
+
+        :param spec.Connection.Start start: Connection.Start method
+        :rtype: tuple(str or None, str or None)
+
+        """
+        if as_bytes(ExternalCredentials.TYPE) not in\
+                as_bytes(start.mechanisms).split():
+            return None, None
+        return ExternalCredentials.TYPE, b''
+
+    def erase_credentials(self):  # pylint: disable=R0201
+        """Called by Connection when it no longer needs the credentials"""
+        LOGGER.debug('Not supported by this Credentials type')
+
+
+# Append custom credential types to this list for validation support
+VALID_TYPES = [PlainCredentials, ExternalCredentials]

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/data.py

@@ -0,0 +1,328 @@
+"""AMQP Table Encoding/Decoding"""
+import struct
+import decimal
+import calendar
+
+from datetime import datetime
+
+from pika import exceptions
+from pika.compat import PY2, basestring
+from pika.compat import unicode_type, long, as_bytes
+
+
+def encode_short_string(pieces, value):
+    """Encode a string value as short string and append it to pieces list
+    returning the size of the encoded value.
+
+    :param list pieces: Already encoded values
+    :param str value: String value to encode
+    :rtype: int
+
+    """
+    encoded_value = as_bytes(value)
+    length = len(encoded_value)
+
+    # 4.2.5.3
+    # Short strings, stored as an 8-bit unsigned integer length followed by zero
+    # or more octets of data. Short strings can carry up to 255 octets of UTF-8
+    # data, but may not contain binary zero octets.
+    # ...
+    # 4.2.5.5
+    # The server SHOULD validate field names and upon receiving an invalid field
+    # name, it SHOULD signal a connection exception with reply code 503 (syntax
+    # error).
+    # -> validate length (avoid truncated utf-8 / corrupted data), but skip null
+    # byte check.
+    if length > 255:
+        raise exceptions.ShortStringTooLong(encoded_value)
+
+    pieces.append(struct.pack('B', length))
+    pieces.append(encoded_value)
+    return 1 + length
+
+
+if PY2:
+
+    def decode_short_string(encoded, offset):
+        """Decode a short string value from ``encoded`` data at ``offset``.
+        """
+        length = struct.unpack_from('B', encoded, offset)[0]
+        offset += 1
+        # Purely for compatibility with original python2 code. No idea what
+        # and why this does.
+        value = encoded[offset:offset + length]
+        try:
+            value = bytes(value)
+        except UnicodeEncodeError:
+            pass
+        offset += length
+        return value, offset
+
+else:
+
+    def decode_short_string(encoded, offset):
+        """Decode a short string value from ``encoded`` data at ``offset``.
+        """
+        length = struct.unpack_from('B', encoded, offset)[0]
+        offset += 1
+        value = encoded[offset:offset + length]
+        try:
+            value = value.decode('utf8')
+        except UnicodeDecodeError:
+            pass
+        offset += length
+        return value, offset
+
+
+def encode_table(pieces, table):
+    """Encode a dict as an AMQP table appending the encded table to the
+    pieces list passed in.
+
+    :param list pieces: Already encoded frame pieces
+    :param dict table: The dict to encode
+    :rtype: int
+
+    """
+    table = table or {}
+    length_index = len(pieces)
+    pieces.append(None)  # placeholder
+    tablesize = 0
+    for (key, value) in table.items():
+        tablesize += encode_short_string(pieces, key)
+        tablesize += encode_value(pieces, value)
+
+    pieces[length_index] = struct.pack('>I', tablesize)
+    return tablesize + 4
+
+
+def encode_value(pieces, value): # pylint: disable=R0911
+    """Encode the value passed in and append it to the pieces list returning
+    the the size of the encoded value.
+
+    :param list pieces: Already encoded values
+    :param any value: The value to encode
+    :rtype: int
+
+    """
+
+    if PY2:
+        if isinstance(value, basestring):
+            if isinstance(value, unicode_type):
+                value = value.encode('utf-8')
+            pieces.append(struct.pack('>cI', b'S', len(value)))
+            pieces.append(value)
+            return 5 + len(value)
+    else:
+        # support only str on Python 3
+        if isinstance(value, basestring):
+            value = value.encode('utf-8')
+            pieces.append(struct.pack('>cI', b'S', len(value)))
+            pieces.append(value)
+            return 5 + len(value)
+
+        if isinstance(value, bytes):
+            pieces.append(struct.pack('>cI', b'x', len(value)))
+            pieces.append(value)
+            return 5 + len(value)
+
+    if isinstance(value, bool):
+        pieces.append(struct.pack('>cB', b't', int(value)))
+        return 2
+    if isinstance(value, long):
+        if value < 0:
+            pieces.append(struct.pack('>cq', b'L', value))
+        else:
+            pieces.append(struct.pack('>cQ', b'l', value))
+        return 9
+    elif isinstance(value, int):
+        try:
+            packed = struct.pack('>ci', b'I', value)
+            pieces.append(packed)
+            return 5
+        except struct.error:
+            if value < 0:
+                packed = struct.pack('>cq', b'L', long(value))
+            else:
+                packed = struct.pack('>cQ', b'l', long(value))
+            pieces.append(packed)
+            return 9
+    elif isinstance(value, decimal.Decimal):
+        value = value.normalize()
+        if value.as_tuple().exponent < 0:
+            decimals = -value.as_tuple().exponent
+            raw = int(value * (decimal.Decimal(10)**decimals))
+            pieces.append(struct.pack('>cBi', b'D', decimals, raw))
+        else:
+            # per spec, the "decimals" octet is unsigned (!)
+            pieces.append(struct.pack('>cBi', b'D', 0, int(value)))
+        return 6
+    elif isinstance(value, datetime):
+        pieces.append(
+            struct.pack('>cQ', b'T', calendar.timegm(value.utctimetuple())))
+        return 9
+    elif isinstance(value, dict):
+        pieces.append(struct.pack('>c', b'F'))
+        return 1 + encode_table(pieces, value)
+    elif isinstance(value, list):
+        list_pieces = []
+        for val in value:
+            encode_value(list_pieces, val)
+        piece = b''.join(list_pieces)
+        pieces.append(struct.pack('>cI', b'A', len(piece)))
+        pieces.append(piece)
+        return 5 + len(piece)
+    elif value is None:
+        pieces.append(struct.pack('>c', b'V'))
+        return 1
+    else:
+        raise exceptions.UnsupportedAMQPFieldException(pieces, value)
+
+
+def decode_table(encoded, offset):
+    """Decode the AMQP table passed in from the encoded value returning the
+    decoded result and the number of bytes read plus the offset.
+
+    :param str encoded: The binary encoded data to decode
+    :param int offset: The starting byte offset
+    :rtype: tuple
+
+    """
+    result = {}
+    tablesize = struct.unpack_from('>I', encoded, offset)[0]
+    offset += 4
+    limit = offset + tablesize
+    while offset < limit:
+        key, offset = decode_short_string(encoded, offset)
+        value, offset = decode_value(encoded, offset)
+        result[key] = value
+    return result, offset
+
+
+def decode_value(encoded, offset): # pylint: disable=R0912,R0915
+    """Decode the value passed in returning the decoded value and the number
+    of bytes read in addition to the starting offset.
+
+    :param str encoded: The binary encoded data to decode
+    :param int offset: The starting byte offset
+    :rtype: tuple
+    :raises: pika.exceptions.InvalidFieldTypeException
+
+    """
+    # slice to get bytes in Python 3 and str in Python 2
+    kind = encoded[offset:offset + 1]
+    offset += 1
+
+    # Bool
+    if kind == b't':
+        value = struct.unpack_from('>B', encoded, offset)[0]
+        value = bool(value)
+        offset += 1
+
+    # Short-Short Int
+    elif kind == b'b':
+        value = struct.unpack_from('>B', encoded, offset)[0]
+        offset += 1
+
+    # Short-Short Unsigned Int
+    elif kind == b'B':
+        value = struct.unpack_from('>b', encoded, offset)[0]
+        offset += 1
+
+    # Short Int
+    elif kind == b'U':
+        value = struct.unpack_from('>h', encoded, offset)[0]
+        offset += 2
+
+    # Short Unsigned Int
+    elif kind == b'u':
+        value = struct.unpack_from('>H', encoded, offset)[0]
+        offset += 2
+
+    # Long Int
+    elif kind == b'I':
+        value = struct.unpack_from('>i', encoded, offset)[0]
+        offset += 4
+
+    # Long Unsigned Int
+    elif kind == b'i':
+        value = struct.unpack_from('>I', encoded, offset)[0]
+        offset += 4
+
+    # Long-Long Int
+    elif kind == b'L':
+        value = long(struct.unpack_from('>q', encoded, offset)[0])
+        offset += 8
+
+    # Long-Long Unsigned Int
+    elif kind == b'l':
+        value = long(struct.unpack_from('>Q', encoded, offset)[0])
+        offset += 8
+
+    # Float
+    elif kind == b'f':
+        value = long(struct.unpack_from('>f', encoded, offset)[0])
+        offset += 4
+
+    # Double
+    elif kind == b'd':
+        value = long(struct.unpack_from('>d', encoded, offset)[0])
+        offset += 8
+
+    # Decimal
+    elif kind == b'D':
+        decimals = struct.unpack_from('B', encoded, offset)[0]
+        offset += 1
+        raw = struct.unpack_from('>i', encoded, offset)[0]
+        offset += 4
+        value = decimal.Decimal(raw) * (decimal.Decimal(10)**-decimals)
+
+    # https://github.com/pika/pika/issues/1205
+    # Short Signed Int
+    elif kind == b's':
+        value = struct.unpack_from('>h', encoded, offset)[0]
+        offset += 2
+
+    # Long String
+    elif kind == b'S':
+        length = struct.unpack_from('>I', encoded, offset)[0]
+        offset += 4
+        value = encoded[offset:offset + length]
+        try:
+            value = value.decode('utf8')
+        except UnicodeDecodeError:
+            pass
+        offset += length
+
+    elif kind == b'x':
+        length = struct.unpack_from('>I', encoded, offset)[0]
+        offset += 4
+        value = encoded[offset:offset + length]
+        offset += length
+
+    # Field Array
+    elif kind == b'A':
+        length = struct.unpack_from('>I', encoded, offset)[0]
+        offset += 4
+        offset_end = offset + length
+        value = []
+        while offset < offset_end:
+            val, offset = decode_value(encoded, offset)
+            value.append(val)
+
+    # Timestamp
+    elif kind == b'T':
+        value = datetime.utcfromtimestamp(
+            struct.unpack_from('>Q', encoded, offset)[0])
+        offset += 8
+
+    # Field Table
+    elif kind == b'F':
+        (value, offset) = decode_table(encoded, offset)
+
+    # Null / Void
+    elif kind == b'V':
+        value = None
+    else:
+        raise exceptions.InvalidFieldTypeException(kind)
+
+    return value, offset

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/delivery_mode.py

@@ -0,0 +1,6 @@
+from enum import Enum
+
+
+class DeliveryMode(Enum):
+    Transient = 1
+    Persistent = 2

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/diagnostic_utils.py

@@ -0,0 +1,62 @@
+"""
+Diagnostic utilities
+"""
+
+import functools
+import sys
+import traceback
+
+
+def create_log_exception_decorator(logger):
+    """Create a decorator that logs and reraises any exceptions that escape
+    the decorated function
+
+    :param logging.Logger logger:
+    :returns: the decorator
+    :rtype: callable
+
+    Usage example
+
+    import logging
+
+    from pika.diagnostics_utils import create_log_exception_decorator
+
+    _log_exception = create_log_exception_decorator(logging.getLogger(__name__))
+
+    @_log_exception
+    def my_func_or_method():
+        raise Exception('Oops!')
+
+    """
+
+    def log_exception(func):
+        """The decorator returned by the parent function
+
+        :param func: function to be wrapped
+        :returns: the function wrapper
+        :rtype: callable
+        """
+
+        @functools.wraps(func)
+        def log_exception_func_wrap(*args, **kwargs):
+            """The wrapper function returned by the decorator. Invokes the
+            function with the given args/kwargs and returns the function's
+            return value. If the function exits with an exception, logs the
+            exception traceback and re-raises the
+
+            :param args: positional args passed to wrapped function
+            :param kwargs: keyword args passed to wrapped function
+            :returns: whatever the wrapped function returns
+            :rtype: object
+            """
+            try:
+                return func(*args, **kwargs)
+            except:
+                logger.exception(
+                    'Wrapped func exited with exception. Caller\'s stack:\n%s',
+                    ''.join(traceback.format_exception(*sys.exc_info())))
+                raise
+
+        return log_exception_func_wrap
+
+    return log_exception

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/exceptions.py

@@ -0,0 +1,355 @@
+"""Pika specific exceptions"""
+# pylint: disable=C0111,E1136
+
+
+class AMQPError(Exception):
+
+    def __repr__(self):
+        return '%s: An unspecified AMQP error has occurred; %s' % (
+            self.__class__.__name__, self.args)
+
+
+class AMQPConnectionError(AMQPError):
+
+    def __repr__(self):
+        if len(self.args) == 2:
+            return '{}: ({}) {}'.format(self.__class__.__name__, self.args[0],
+                                        self.args[1])
+        else:
+            return '{}: {}'.format(self.__class__.__name__, self.args)
+
+
+class ConnectionOpenAborted(AMQPConnectionError):
+    """Client closed connection while opening."""
+
+
+class StreamLostError(AMQPConnectionError):
+    """Stream (TCP) connection lost."""
+
+
+class IncompatibleProtocolError(AMQPConnectionError):
+
+    def __repr__(self):
+        return (
+            '%s: The protocol returned by the server is not supported: %s' % (
+                self.__class__.__name__,
+                self.args,
+            ))
+
+
+class AuthenticationError(AMQPConnectionError):
+
+    def __repr__(self):
+        return ('%s: Server and client could not negotiate use of the %s '
+                'authentication mechanism' % (self.__class__.__name__,
+                                              self.args[0]))
+
+
+class ProbableAuthenticationError(AMQPConnectionError):
+
+    def __repr__(self):
+        return (
+            '%s: Client was disconnected at a connection stage indicating a '
+            'probable authentication error: %s' % (
+                self.__class__.__name__,
+                self.args,
+            ))
+
+
+class ProbableAccessDeniedError(AMQPConnectionError):
+
+    def __repr__(self):
+        return (
+            '%s: Client was disconnected at a connection stage indicating a '
+            'probable denial of access to the specified virtual host: %s' % (
+                self.__class__.__name__,
+                self.args,
+            ))
+
+
+class NoFreeChannels(AMQPConnectionError):
+
+    def __repr__(self):
+        return '%s: The connection has run out of free channels' % (
+            self.__class__.__name__)
+
+
+class ConnectionWrongStateError(AMQPConnectionError):
+    """Connection is in wrong state for the requested operation."""
+
+    def __repr__(self):
+        if self.args:
+            return super(ConnectionWrongStateError, self).__repr__()
+        else:
+            return ('%s: The connection is in wrong state for the requested '
+                    'operation.' % self.__class__.__name__)
+
+
+class ConnectionClosed(AMQPConnectionError):
+
+    def __init__(self, reply_code, reply_text):
+        """
+
+        :param int reply_code: reply-code that was used in user's or broker's
+            `Connection.Close` method. NEW in v1.0.0
+        :param str reply_text: reply-text that was used in user's or broker's
+            `Connection.Close` method. Human-readable string corresponding to
+            `reply_code`. NEW in v1.0.0
+        """
+        super(ConnectionClosed, self).__init__(int(reply_code), str(reply_text))
+
+    def __repr__(self):
+        return '{}: ({}) {!r}'.format(self.__class__.__name__, self.reply_code,
+                                      self.reply_text)
+
+    @property
+    def reply_code(self):
+        """ NEW in v1.0.0
+        :rtype: int
+
+        """
+        return self.args[0]
+
+    @property
+    def reply_text(self):
+        """ NEW in v1.0.0
+        :rtype: str
+
+        """
+        return self.args[1]
+
+
+class ConnectionClosedByBroker(ConnectionClosed):
+    """Connection.Close from broker."""
+
+
+class ConnectionClosedByClient(ConnectionClosed):
+    """Connection was closed at request of Pika client."""
+
+
+class ConnectionBlockedTimeout(AMQPConnectionError):
+    """RabbitMQ-specific: timed out waiting for connection.unblocked."""
+
+
+class AMQPHeartbeatTimeout(AMQPConnectionError):
+    """Connection was dropped as result of heartbeat timeout."""
+
+
+class AMQPChannelError(AMQPError):
+
+    def __repr__(self):
+        return '{}: {!r}'.format(self.__class__.__name__, self.args)
+
+
+class ChannelWrongStateError(AMQPChannelError):
+    """Channel is in wrong state for the requested operation."""
+
+
+class ChannelClosed(AMQPChannelError):
+    """The channel closed by client or by broker
+
+    """
+
+    def __init__(self, reply_code, reply_text):
+        """
+
+        :param int reply_code: reply-code that was used in user's or broker's
+            `Channel.Close` method. One of the AMQP-defined Channel Errors.
+            NEW in v1.0.0
+        :param str reply_text: reply-text that was used in user's or broker's
+            `Channel.Close` method. Human-readable string corresponding to
+            `reply_code`;
+            NEW in v1.0.0
+
+        """
+        super(ChannelClosed, self).__init__(int(reply_code), str(reply_text))
+
+    def __repr__(self):
+        return '{}: ({}) {!r}'.format(self.__class__.__name__, self.reply_code,
+                                      self.reply_text)
+
+    @property
+    def reply_code(self):
+        """ NEW in v1.0.0
+        :rtype: int
+
+        """
+        return self.args[0]
+
+    @property
+    def reply_text(self):
+        """ NEW in v1.0.0
+        :rtype: str
+
+        """
+        return self.args[1]
+
+
+class ChannelClosedByBroker(ChannelClosed):
+    """`Channel.Close` from broker; may be passed as reason to channel's
+    on-closed callback of non-blocking connection adapters or raised by
+    `BlockingConnection`.
+
+    NEW in v1.0.0
+    """
+
+
+class ChannelClosedByClient(ChannelClosed):
+    """Channel closed by client upon receipt of `Channel.CloseOk`; may be passed
+    as reason to channel's on-closed callback of non-blocking connection
+    adapters, but not raised by `BlockingConnection`.
+
+    NEW in v1.0.0
+    """
+
+
+class DuplicateConsumerTag(AMQPChannelError):
+
+    def __repr__(self):
+        return ('%s: The consumer tag specified already exists for this '
+                'channel: %s' % (self.__class__.__name__, self.args[0]))
+
+
+class ConsumerCancelled(AMQPChannelError):
+
+    def __repr__(self):
+        return '%s: Server cancelled consumer' % self.__class__.__name__
+
+
+class UnroutableError(AMQPChannelError):
+    """Exception containing one or more unroutable messages returned by broker
+    via Basic.Return.
+
+    Used by BlockingChannel.
+
+    In publisher-acknowledgements mode, this is raised upon receipt of Basic.Ack
+    from broker; in the event of Basic.Nack from broker, `NackError` is raised
+    instead
+    """
+
+    def __init__(self, messages):
+        """
+        :param sequence(blocking_connection.ReturnedMessage) messages: Sequence
+            of returned unroutable messages
+        """
+        super(UnroutableError, self).__init__(
+            "%s unroutable message(s) returned" % (len(messages)))
+
+        self.messages = messages
+
+    def __repr__(self):
+        return '%s: %i unroutable messages returned by broker' % (
+            self.__class__.__name__, len(self.messages))
+
+
+class NackError(AMQPChannelError):
+    """This exception is raised when a message published in
+    publisher-acknowledgements mode is Nack'ed by the broker.
+
+    Used by BlockingChannel.
+    """
+
+    def __init__(self, messages):
+        """
+        :param sequence(blocking_connection.ReturnedMessage) messages: Sequence
+            of returned unroutable messages
+        """
+        super(NackError,
+              self).__init__("%s message(s) NACKed" % (len(messages)))
+
+        self.messages = messages
+
+    def __repr__(self):
+        return '%s: %i unroutable messages returned by broker' % (
+            self.__class__.__name__, len(self.messages))
+
+
+class InvalidChannelNumber(AMQPError):
+
+    def __repr__(self):
+        return '%s: An invalid channel number has been specified: %s' % (
+            self.__class__.__name__, self.args[0])
+
+
+class ProtocolSyntaxError(AMQPError):
+
+    def __repr__(self):
+        return '%s: An unspecified protocol syntax error occurred' % (
+            self.__class__.__name__)
+
+
+class UnexpectedFrameError(ProtocolSyntaxError):
+
+    def __repr__(self):
+        return '%s: Received a frame out of sequence: %r' % (
+            self.__class__.__name__, self.args[0])
+
+
+class ProtocolVersionMismatch(ProtocolSyntaxError):
+
+    def __repr__(self):
+        return '%s: Protocol versions did not match: %r vs %r' % (
+            self.__class__.__name__, self.args[0], self.args[1])
+
+
+class BodyTooLongError(ProtocolSyntaxError):
+
+    def __repr__(self):
+        return ('%s: Received too many bytes for a message delivery: '
+                'Received %i, expected %i' % (self.__class__.__name__,
+                                              self.args[0], self.args[1]))
+
+
+class InvalidFrameError(ProtocolSyntaxError):
+
+    def __repr__(self):
+        return '%s: Invalid frame received: %r' % (self.__class__.__name__,
+                                                   self.args[0])
+
+
+class InvalidFieldTypeException(ProtocolSyntaxError):
+
+    def __repr__(self):
+        return '%s: Unsupported field kind %s' % (self.__class__.__name__,
+                                                  self.args[0])
+
+
+class UnsupportedAMQPFieldException(ProtocolSyntaxError):
+
+    def __repr__(self):
+        return '%s: Unsupported field kind %s' % (self.__class__.__name__,
+                                                  type(self.args[1]))
+
+
+class MethodNotImplemented(AMQPError):
+    pass
+
+
+class ChannelError(Exception):
+
+    def __repr__(self):
+        return '%s: An unspecified error occurred with the Channel' % (
+            self.__class__.__name__)
+
+
+class ReentrancyError(Exception):
+    """The requested operation would result in unsupported recursion or
+    reentrancy.
+
+    Used by BlockingConnection/BlockingChannel
+
+    """
+
+
+class ShortStringTooLong(AMQPError):
+
+    def __repr__(self):
+        return ('%s: AMQP Short String can contain up to 255 bytes: '
+                '%.300s' % (self.__class__.__name__, self.args[0]))
+
+
+class DuplicateGetOkCallback(ChannelError):
+
+    def __repr__(self):
+        return ('%s: basic_get can only be called again after the callback for '
+                'the previous basic_get is executed' % self.__class__.__name__)

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/exchange_type.py

@@ -0,0 +1,18 @@
+try:
+    from enum import StrEnum  # available from Python 3.11
+
+
+    class ExchangeType(StrEnum):
+        direct = 'direct'
+        fanout = 'fanout'
+        headers = 'headers'
+        topic = 'topic'
+except ImportError:
+    from enum import Enum
+
+
+    class ExchangeType(str, Enum):
+        direct = 'direct'
+        fanout = 'fanout'
+        headers = 'headers'
+        topic = 'topic'

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/frame.py

@@ -0,0 +1,264 @@
+"""Frame objects that do the frame demarshaling and marshaling."""
+import logging
+import struct
+
+from pika import amqp_object
+from pika import exceptions
+from pika import spec
+from pika.compat import byte
+
+LOGGER = logging.getLogger(__name__)
+
+
+class Frame(amqp_object.AMQPObject):
+    """Base Frame object mapping. Defines a behavior for all child classes for
+    assignment of core attributes and implementation of the a core _marshal
+    method which child classes use to create the binary AMQP frame.
+
+    """
+    NAME = 'Frame'
+
+    def __init__(self, frame_type, channel_number):
+        """Create a new instance of a frame
+
+        :param int frame_type: The frame type
+        :param int channel_number: The channel number for the frame
+
+        """
+        self.frame_type = frame_type
+        self.channel_number = channel_number
+
+    def _marshal(self, pieces):
+        """Create the full AMQP wire protocol frame data representation
+
+        :rtype: bytes
+
+        """
+        payload = b''.join(pieces)
+        return struct.pack('>BHI', self.frame_type, self.channel_number,
+                           len(payload)) + payload + byte(spec.FRAME_END)
+
+    def marshal(self):
+        """To be ended by child classes
+
+        :raises NotImplementedError
+
+        """
+        raise NotImplementedError
+
+
+class Method(Frame):
+    """Base Method frame object mapping. AMQP method frames are mapped on top
+    of this class for creating or accessing their data and attributes.
+
+    """
+    NAME = 'METHOD'
+
+    def __init__(self, channel_number, method):
+        """Create a new instance of a frame
+
+        :param int channel_number: The frame type
+        :param pika.Spec.Class.Method method: The AMQP Class.Method
+
+        """
+        Frame.__init__(self, spec.FRAME_METHOD, channel_number)
+        self.method = method
+
+    def marshal(self):
+        """Return the AMQP binary encoded value of the frame
+
+        :rtype: str
+
+        """
+        pieces = self.method.encode()
+        pieces.insert(0, struct.pack('>I', self.method.INDEX))
+        return self._marshal(pieces)
+
+
+class Header(Frame):
+    """Header frame object mapping. AMQP content header frames are mapped
+    on top of this class for creating or accessing their data and attributes.
+
+    """
+    NAME = 'Header'
+
+    def __init__(self, channel_number, body_size, props):
+        """Create a new instance of a AMQP ContentHeader object
+
+        :param int channel_number: The channel number for the frame
+        :param int body_size: The number of bytes for the body
+        :param pika.spec.BasicProperties props: Basic.Properties object
+
+        """
+        Frame.__init__(self, spec.FRAME_HEADER, channel_number)
+        self.body_size = body_size
+        self.properties = props
+
+    def marshal(self):
+        """Return the AMQP binary encoded value of the frame
+
+        :rtype: str
+
+        """
+        pieces = self.properties.encode()
+        pieces.insert(
+            0, struct.pack('>HxxQ', self.properties.INDEX, self.body_size))
+        return self._marshal(pieces)
+
+
+class Body(Frame):
+    """Body frame object mapping class. AMQP content body frames are mapped on
+    to this base class for getting/setting of attributes/data.
+
+    """
+    NAME = 'Body'
+
+    def __init__(self, channel_number, fragment):
+        """
+        Parameters:
+
+        - channel_number: int
+        - fragment: unicode or str
+        """
+        Frame.__init__(self, spec.FRAME_BODY, channel_number)
+        self.fragment = fragment
+
+    def marshal(self):
+        """Return the AMQP binary encoded value of the frame
+
+        :rtype: str
+
+        """
+        return self._marshal([self.fragment])
+
+
+class Heartbeat(Frame):
+    """Heartbeat frame object mapping class. AMQP Heartbeat frames are mapped
+    on to this class for a common access structure to the attributes/data
+    values.
+
+    """
+    NAME = 'Heartbeat'
+
+    def __init__(self):
+        """Create a new instance of the Heartbeat frame"""
+        Frame.__init__(self, spec.FRAME_HEARTBEAT, 0)
+
+    def marshal(self):
+        """Return the AMQP binary encoded value of the frame
+
+        :rtype: str
+
+        """
+        return self._marshal(list())
+
+
+class ProtocolHeader(amqp_object.AMQPObject):
+    """AMQP Protocol header frame class which provides a pythonic interface
+    for creating AMQP Protocol headers
+
+    """
+    NAME = 'ProtocolHeader'
+
+    def __init__(self, major=None, minor=None, revision=None):
+        """Construct a Protocol Header frame object for the specified AMQP
+        version
+
+        :param int major: Major version number
+        :param int minor: Minor version number
+        :param int revision: Revision
+
+        """
+        self.frame_type = -1
+        self.major = major or spec.PROTOCOL_VERSION[0]
+        self.minor = minor or spec.PROTOCOL_VERSION[1]
+        self.revision = revision or spec.PROTOCOL_VERSION[2]
+
+    def marshal(self):
+        """Return the full AMQP wire protocol frame data representation of the
+        ProtocolHeader frame
+
+        :rtype: str
+
+        """
+        return b'AMQP' + struct.pack('BBBB', 0, self.major, self.minor,
+                                     self.revision)
+
+
+def decode_frame(data_in): # pylint: disable=R0911,R0914
+    """Receives raw socket data and attempts to turn it into a frame.
+    Returns bytes used to make the frame and the frame
+
+    :param str data_in: The raw data stream
+    :rtype: tuple(bytes consumed, frame)
+    :raises: pika.exceptions.InvalidFrameError
+
+    """
+    # Look to see if it's a protocol header frame
+    try:
+        if data_in[0:4] == b'AMQP':
+            major, minor, revision = struct.unpack_from('BBB', data_in, 5)
+            return 8, ProtocolHeader(major, minor, revision)
+    except (IndexError, struct.error):
+        return 0, None
+
+    # Get the Frame Type, Channel Number and Frame Size
+    try:
+        (frame_type, channel_number, frame_size) = struct.unpack(
+            '>BHL', data_in[0:7])
+    except struct.error:
+        return 0, None
+
+    # Get the frame data
+    frame_end = spec.FRAME_HEADER_SIZE + frame_size + spec.FRAME_END_SIZE
+
+    # We don't have all of the frame yet
+    if frame_end > len(data_in):
+        return 0, None
+
+    # The Frame termination chr is wrong
+    if data_in[frame_end - 1:frame_end] != byte(spec.FRAME_END):
+        raise exceptions.InvalidFrameError("Invalid FRAME_END marker")
+
+    # Get the raw frame data
+    frame_data = data_in[spec.FRAME_HEADER_SIZE:frame_end - 1]
+
+    if frame_type == spec.FRAME_METHOD:
+
+        # Get the Method ID from the frame data
+        method_id = struct.unpack_from('>I', frame_data)[0]
+
+        # Get a Method object for this method_id
+        method = spec.methods[method_id]()
+
+        # Decode the content
+        method.decode(frame_data, 4)
+
+        # Return the amount of data consumed and the Method object
+        return frame_end, Method(channel_number, method)
+
+    elif frame_type == spec.FRAME_HEADER:
+
+        # Return the header class and body size
+        class_id, weight, body_size = struct.unpack_from('>HHQ', frame_data)
+
+        # Get the Properties type
+        properties = spec.props[class_id]()
+
+        # Decode the properties
+        out = properties.decode(frame_data[12:])
+
+        # Return a Header frame
+        return frame_end, Header(channel_number, body_size, properties)
+
+    elif frame_type == spec.FRAME_BODY:
+
+        # Return the amount of data consumed and the Body frame w/ data
+        return frame_end, Body(channel_number, frame_data)
+
+    elif frame_type == spec.FRAME_HEARTBEAT:
+
+        # Return the amount of data and a Heartbeat frame
+        return frame_end, Heartbeat()
+
+    raise exceptions.InvalidFrameError("Unknown frame type: %i" % frame_type)

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/heartbeat.py

@@ -0,0 +1,209 @@
+"""Handle AMQP Heartbeats"""
+import logging
+
+import pika.exceptions
+from pika import frame
+
+LOGGER = logging.getLogger(__name__)
+
+
+class HeartbeatChecker(object):
+    """Sends heartbeats to the broker. The provided timeout is used to
+    determine if the connection is stale - no received heartbeats or
+    other activity will close the connection. See the parameter list for more
+    details.
+
+    """
+    _STALE_CONNECTION = "No activity or too many missed heartbeats in the last %i seconds"
+
+    def __init__(self, connection, timeout):
+        """Create an object that will check for activity on the provided
+        connection as well as receive heartbeat frames from the broker. The
+        timeout parameter defines a window within which this activity must
+        happen. If not, the connection is considered dead and closed.
+
+        The value passed for timeout is also used to calculate an interval
+        at which a heartbeat frame is sent to the broker. The interval is
+        equal to the timeout value divided by two.
+
+        :param pika.connection.Connection: Connection object
+        :param int timeout: Connection idle timeout. If no activity occurs on the
+                            connection nor heartbeat frames received during the
+                            timeout window the connection will be closed. The
+                            interval used to send heartbeats is calculated from
+                            this value by dividing it by two.
+
+        """
+        if timeout < 1:
+            raise ValueError('timeout must >= 0, but got %r' % (timeout,))
+
+        self._connection = connection
+
+        # Note: see the following documents:
+        # https://www.rabbitmq.com/heartbeats.html#heartbeats-timeout
+        # https://github.com/pika/pika/pull/1072
+        # https://groups.google.com/d/topic/rabbitmq-users/Fmfeqe5ocTY/discussion
+        # There is a certain amount of confusion around how client developers
+        # interpret the spec. The spec talks about 2 missed heartbeats as a
+        # *timeout*, plus that any activity on the connection counts for a
+        # heartbeat. This is to avoid edge cases and not to depend on network
+        # latency.
+        self._timeout = timeout
+
+        self._send_interval = float(timeout) / 2
+
+        # Note: Pika will calculate the heartbeat / connectivity check interval
+        # by adding 5 seconds to the negotiated timeout to leave a bit of room
+        # for broker heartbeats that may be right at the edge of the timeout
+        # window. This is different behavior from the RabbitMQ Java client and
+        # the spec that suggests a check interval equivalent to two times the
+        # heartbeat timeout value. But, one advantage of adding a small amount
+        # is that bad connections will be detected faster.
+        # https://github.com/pika/pika/pull/1072#issuecomment-397850795
+        # https://github.com/rabbitmq/rabbitmq-java-client/blob/b55bd20a1a236fc2d1ea9369b579770fa0237615/src/main/java/com/rabbitmq/client/impl/AMQConnection.java#L773-L780
+        # https://github.com/ruby-amqp/bunny/blob/3259f3af2e659a49c38c2470aa565c8fb825213c/lib/bunny/session.rb#L1187-L1192
+        self._check_interval = timeout + 5
+
+        LOGGER.debug('timeout: %f send_interval: %f check_interval: %f',
+                     self._timeout, self._send_interval, self._check_interval)
+
+        # Initialize counters
+        self._bytes_received = 0
+        self._bytes_sent = 0
+        self._heartbeat_frames_received = 0
+        self._heartbeat_frames_sent = 0
+        self._idle_byte_intervals = 0
+
+        self._send_timer = None
+        self._check_timer = None
+        self._start_send_timer()
+        self._start_check_timer()
+
+    @property
+    def bytes_received_on_connection(self):
+        """Return the number of bytes received by the connection bytes object.
+
+        :rtype int
+
+        """
+        return self._connection.bytes_received
+
+    @property
+    def connection_is_idle(self):
+        """Returns true if the byte count hasn't changed in enough intervals
+        to trip the max idle threshold.
+
+        """
+        return self._idle_byte_intervals > 0
+
+    def received(self):
+        """Called when a heartbeat is received"""
+        LOGGER.debug('Received heartbeat frame')
+        self._heartbeat_frames_received += 1
+
+    def _send_heartbeat(self):
+        """Invoked by a timer to send a heartbeat when we need to.
+
+        """
+        LOGGER.debug('Sending heartbeat frame')
+        self._send_heartbeat_frame()
+        self._start_send_timer()
+
+    def _check_heartbeat(self):
+        """Invoked by a timer to check for broker heartbeats. Checks to see
+        if we've missed any heartbeats and disconnect our connection if it's
+        been idle too long.
+
+        """
+        if self._has_received_data:
+            self._idle_byte_intervals = 0
+        else:
+            # Connection has not received any data, increment the counter
+            self._idle_byte_intervals += 1
+
+        LOGGER.debug(
+            'Received %i heartbeat frames, sent %i, '
+            'idle intervals %i', self._heartbeat_frames_received,
+            self._heartbeat_frames_sent, self._idle_byte_intervals)
+
+        if self.connection_is_idle:
+            self._close_connection()
+            return
+
+        self._start_check_timer()
+
+    def stop(self):
+        """Stop the heartbeat checker"""
+        if self._send_timer:
+            LOGGER.debug('Removing timer for next heartbeat send interval')
+            self._connection._adapter_remove_timeout(self._send_timer)  # pylint: disable=W0212
+            self._send_timer = None
+        if self._check_timer:
+            LOGGER.debug('Removing timer for next heartbeat check interval')
+            self._connection._adapter_remove_timeout(self._check_timer)  # pylint: disable=W0212
+            self._check_timer = None
+
+    def _close_connection(self):
+        """Close the connection with the AMQP Connection-Forced value."""
+        LOGGER.info('Connection is idle, %i stale byte intervals',
+                    self._idle_byte_intervals)
+        text = HeartbeatChecker._STALE_CONNECTION % self._timeout
+
+        # Abort the stream connection. There is no point trying to gracefully
+        # close the AMQP connection since lack of heartbeat suggests that the
+        # stream is dead.
+        self._connection._terminate_stream(  # pylint: disable=W0212
+            pika.exceptions.AMQPHeartbeatTimeout(text))
+
+    @property
+    def _has_received_data(self):
+        """Returns True if the connection has received data.
+
+        :rtype: bool
+
+        """
+        return self._bytes_received != self.bytes_received_on_connection
+
+    @staticmethod
+    def _new_heartbeat_frame():
+        """Return a new heartbeat frame.
+
+        :rtype pika.frame.Heartbeat
+
+        """
+        return frame.Heartbeat()
+
+    def _send_heartbeat_frame(self):
+        """Send a heartbeat frame on the connection.
+
+        """
+        LOGGER.debug('Sending heartbeat frame')
+        self._connection._send_frame(  # pylint: disable=W0212
+            self._new_heartbeat_frame())
+        self._heartbeat_frames_sent += 1
+
+    def _start_send_timer(self):
+        """Start a new heartbeat send timer."""
+        self._send_timer = self._connection._adapter_call_later(  # pylint: disable=W0212
+            self._send_interval,
+            self._send_heartbeat)
+
+    def _start_check_timer(self):
+        """Start a new heartbeat check timer."""
+        # Note: update counters now to get current values
+        # at the start of the timeout window. Values will be
+        # checked against the connection's byte count at the
+        # end of the window
+        self._update_counters()
+
+        self._check_timer = self._connection._adapter_call_later(  # pylint: disable=W0212
+            self._check_interval,
+            self._check_heartbeat)
+
+    def _update_counters(self):
+        """Update the internal counters for bytes sent and received and the
+        number of frames received
+
+        """
+        self._bytes_sent = self._connection.bytes_sent
+        self._bytes_received = self._connection.bytes_received

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/tcp_socket_opts.py

@@ -0,0 +1,47 @@
+# pylint: disable=C0111
+
+import logging
+import socket
+import pika.compat
+
+LOGGER = logging.getLogger(__name__)
+
+_SUPPORTED_TCP_OPTIONS = {}
+
+try:
+    _SUPPORTED_TCP_OPTIONS['TCP_USER_TIMEOUT'] = socket.TCP_USER_TIMEOUT
+except AttributeError:
+    if pika.compat.LINUX_VERSION and pika.compat.LINUX_VERSION >= (2, 6, 37):
+        # this is not the timeout value, but the number corresponding
+        # to the constant in tcp.h
+        # https://github.com/torvalds/linux/blob/master/include/uapi/linux/tcp.h#
+        # #define TCP_USER_TIMEOUT	18	/* How long for loss retry before timeout */
+        _SUPPORTED_TCP_OPTIONS['TCP_USER_TIMEOUT'] = 18
+
+try:
+    _SUPPORTED_TCP_OPTIONS['TCP_KEEPIDLE'] = socket.TCP_KEEPIDLE
+    _SUPPORTED_TCP_OPTIONS['TCP_KEEPCNT'] = socket.TCP_KEEPCNT
+    _SUPPORTED_TCP_OPTIONS['TCP_KEEPINTVL'] = socket.TCP_KEEPINTVL
+except AttributeError:
+    pass
+
+
+def socket_requires_keepalive(tcp_options):
+    return ('TCP_KEEPIDLE' in tcp_options or
+            'TCP_KEEPCNT' in tcp_options or
+            'TCP_KEEPINTVL' in tcp_options)
+
+
+def set_sock_opts(tcp_options, sock):
+    if not tcp_options:
+        return
+
+    if socket_requires_keepalive(tcp_options):
+        sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
+
+    for key, value in tcp_options.items():
+        option = _SUPPORTED_TCP_OPTIONS.get(key)
+        if option:
+            sock.setsockopt(pika.compat.SOL_TCP, option, value)
+        else:
+            LOGGER.warning('Unsupported TCP option %s:%s', key, value)

vaksman_valeria_lab_4/venv/Lib/site-packages/pika/validators.py

@@ -0,0 +1,63 @@
+"""
+Common validation functions
+"""
+
+from pika.compat import basestring
+
+
+def require_string(value, value_name):
+    """Require that value is a string
+
+    :raises: TypeError
+
+    """
+    if not isinstance(value, basestring):
+        raise TypeError('%s must be a str or unicode str, but got %r' % (
+            value_name,
+            value,
+        ))
+
+
+def require_callback(callback, callback_name='callback'):
+    """Require that callback is callable and is not None
+
+    :raises: TypeError
+
+    """
+    if not callable(callback):
+        raise TypeError('callback %s must be callable, but got %r' % (
+            callback_name,
+            callback,
+        ))
+
+
+def rpc_completion_callback(callback):
+    """Verify callback is callable if not None
+
+    :returns: boolean indicating nowait
+    :rtype: bool
+    :raises: TypeError
+
+    """
+    if callback is None:
+        # No callback means we will not expect a response
+        # i.e. nowait=True
+        return True
+
+    if callable(callback):
+        # nowait=False
+        return False
+    else:
+        raise TypeError('completion callback must be callable if not None')
+
+
+def zero_or_greater(name, value):
+    """Verify that value is zero or greater. If not, 'name'
+    will be used in error message
+
+    :raises: ValueError
+
+    """
+    if int(value) < 0:
+        errmsg = '{} must be >= 0, but got {}'.format(name, value)
+        raise ValueError(errmsg)

vaksman_valeria_lab_4/venv/Lib/site-packages/pip-23.2.1.dist-info/AUTHORS.txt

@@ -0,0 +1,738 @@
+@Switch01
+A_Rog
+Aakanksha Agrawal
+Abhinav Sagar
+ABHYUDAY PRATAP SINGH
+abs51295
+AceGentile
+Adam Chainz
+Adam Tse
+Adam Wentz
+admin
+Adrien Morison
+ahayrapetyan
+Ahilya
+AinsworthK
+Akash Srivastava
+Alan Yee
+Albert Tugushev
+Albert-Guan
+albertg
+Alberto Sottile
+Aleks Bunin
+Alethea Flowers
+Alex Gaynor
+Alex Grönholm
+Alex Hedges
+Alex Loosley
+Alex Morega
+Alex Stachowiak
+Alexander Shtyrov
+Alexandre Conrad
+Alexey Popravka
+Alli
+Ami Fischman
+Ananya Maiti
+Anatoly Techtonik
+Anders Kaseorg
+Andre Aguiar
+Andreas Lutro
+Andrei Geacar
+Andrew Gaul
+Andrew Shymanel
+Andrey Bienkowski
+Andrey Bulgakov
+Andrés Delfino
+Andy Freeland
+Andy Kluger
+Ani Hayrapetyan
+Aniruddha Basak
+Anish Tambe
+Anrs Hu
+Anthony Sottile
+Antoine Musso
+Anton Ovchinnikov
+Anton Patrushev
+Antonio Alvarado Hernandez
+Antony Lee
+Antti Kaihola
+Anubhav Patel
+Anudit Nagar
+Anuj Godase
+AQNOUCH Mohammed
+AraHaan
+Arindam Choudhury
+Armin Ronacher
+Artem
+Arun Babu Neelicattu
+Ashley Manton
+Ashwin Ramaswami
+atse
+Atsushi Odagiri
+Avinash Karhana
+Avner Cohen
+Awit (Ah-Wit) Ghirmai
+Baptiste Mispelon
+Barney Gale
+barneygale
+Bartek Ogryczak
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+Ben Bodenmiller
+Ben Darnell
+Ben Hoyt
+Ben Mares
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+Bence Nagy
+Benjamin Peterson
+Benjamin VanEvery
+Benoit Pierre
+Berker Peksag
+Bernard
+Bernard Tyers
+Bernardo B. Marques
+Bernhard M. Wiedemann
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+Bhavam Vidyarthi
+Blazej Michalik
+Bogdan Opanchuk
+BorisZZZ
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+Bradley Ayers
+Brandon L. Reiss
+Brandt Bucher
+Brett Randall
+Brett Rosen
+Brian Cristante
+Brian Rosner
+briantracy
+BrownTruck
+Bruno Oliveira
+Bruno Renié
+Bruno S
+Bstrdsmkr
+Buck Golemon
+burrows
+Bussonnier Matthias
+bwoodsend
+c22
+Caleb Martinez
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+Carl Meyer
+Carlos Liam
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+Gopinath M
+GOTO Hayato
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+Kevin Carter
+Kevin Frommelt
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+Kexuan Sun
+Kit Randel
+Klaas van Schelven
+KOLANICH
+kpinc
+Krishna Oza
+Kumar McMillan
+Kyle Persohn
+lakshmanaram
+Laszlo Kiss-Kollar
+Laurent Bristiel
+Laurent LAPORTE
+Laurie O
+Laurie Opperman
+layday
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+Toshio Kuratomi
+toxinu
+Travis Swicegood
+Tushar Sadhwani
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+Viktor Szépe
+Ville Skyttä
+Vinay Sajip
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+Wil Tan
+Wilfred Hughes
+William Edwards
+William ML Leslie
+William T Olson
+William Woodruff
+Wilson Mo
+wim glenn
+Winson Luk
+Wolfgang Maier
+Wu Zhenyu
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+Xavier Fernandez
+xoviat
+xtreak
+YAMAMOTO Takashi
+Yen Chi Hsuan
+Yeray Diaz Diaz
+Yoval P
+Yu Jian
+Yuan Jing Vincent Yan
+Yusuke Hayashi
+Zearin
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+Zvezdan Petkovic
+Łukasz Langa
+Роман Донченко
+Семён Марьясин
+‮rekcäH nitraM‮

vaksman_valeria_lab_4/venv/Lib/site-packages/pip-23.2.1.dist-info/INSTALLER

@@ -0,0 +1 @@
+pip

vaksman_valeria_lab_4/venv/Lib/site-packages/pip-23.2.1.dist-info/LICENSE.txt

@@ -0,0 +1,20 @@
+Copyright (c) 2008-present The pip developers (see AUTHORS.txt file)
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vaksman_valeria_lab_4/venv/Lib/site-packages/pip-23.2.1.dist-info/METADATA

@@ -0,0 +1,90 @@
+Metadata-Version: 2.1
+Name: pip
+Version: 23.2.1
+Summary: The PyPA recommended tool for installing Python packages.
+Home-page: https://pip.pypa.io/
+Author: The pip developers
+Author-email: distutils-sig@python.org
+License: MIT
+Project-URL: Documentation, https://pip.pypa.io
+Project-URL: Source, https://github.com/pypa/pip
+Project-URL: Changelog, https://pip.pypa.io/en/stable/news/
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Intended Audience :: Developers
+Classifier: License :: OSI Approved :: MIT License
+Classifier: Topic :: Software Development :: Build Tools
+Classifier: Programming Language :: Python
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3 :: Only
+Classifier: Programming Language :: Python :: 3.7
+Classifier: Programming Language :: Python :: 3.8
+Classifier: Programming Language :: Python :: 3.9
+Classifier: Programming Language :: Python :: 3.10
+Classifier: Programming Language :: Python :: 3.11
+Classifier: Programming Language :: Python :: 3.12
+Classifier: Programming Language :: Python :: Implementation :: CPython
+Classifier: Programming Language :: Python :: Implementation :: PyPy
+Requires-Python: >=3.7
+License-File: LICENSE.txt
+License-File: AUTHORS.txt
+
+pip - The Python Package Installer
+==================================
+
+.. image:: https://img.shields.io/pypi/v/pip.svg
+   :target: https://pypi.org/project/pip/
+
+.. image:: https://readthedocs.org/projects/pip/badge/?version=latest
+   :target: https://pip.pypa.io/en/latest
+
+pip is the `package installer`_ for Python. You can use pip to install packages from the `Python Package Index`_ and other indexes.
+
+Please take a look at our documentation for how to install and use pip:
+
+* `Installation`_
+* `Usage`_
+
+We release updates regularly, with a new version every 3 months. Find more details in our documentation:
+
+* `Release notes`_
+* `Release process`_
+
+In pip 20.3, we've `made a big improvement to the heart of pip`_; `learn more`_. We want your input, so `sign up for our user experience research studies`_ to help us do it right.
+
+**Note**: pip 21.0, in January 2021, removed Python 2 support, per pip's `Python 2 support policy`_. Please migrate to Python 3.
+
+If you find bugs, need help, or want to talk to the developers, please use our mailing lists or chat rooms:
+
+* `Issue tracking`_
+* `Discourse channel`_
+* `User IRC`_
+
+If you want to get involved head over to GitHub to get the source code, look at our development documentation and feel free to jump on the developer mailing lists and chat rooms:
+
+* `GitHub page`_
+* `Development documentation`_
+* `Development IRC`_
+
+Code of Conduct
+---------------
+
+Everyone interacting in the pip project's codebases, issue trackers, chat
+rooms, and mailing lists is expected to follow the `PSF Code of Conduct`_.
+
+.. _package installer: https://packaging.python.org/guides/tool-recommendations/
+.. _Python Package Index: https://pypi.org
+.. _Installation: https://pip.pypa.io/en/stable/installation/
+.. _Usage: https://pip.pypa.io/en/stable/
+.. _Release notes: https://pip.pypa.io/en/stable/news.html
+.. _Release process: https://pip.pypa.io/en/latest/development/release-process/
+.. _GitHub page: https://github.com/pypa/pip
+.. _Development documentation: https://pip.pypa.io/en/latest/development
+.. _made a big improvement to the heart of pip: https://pyfound.blogspot.com/2020/11/pip-20-3-new-resolver.html
+.. _learn more: https://pip.pypa.io/en/latest/user_guide/#changes-to-the-pip-dependency-resolver-in-20-3-2020
+.. _sign up for our user experience research studies: https://pyfound.blogspot.com/2020/03/new-pip-resolver-to-roll-out-this-year.html
+.. _Python 2 support policy: https://pip.pypa.io/en/latest/development/release-process/#python-2-support
+.. _Issue tracking: https://github.com/pypa/pip/issues
+.. _Discourse channel: https://discuss.python.org/c/packaging
+.. _User IRC: https://kiwiirc.com/nextclient/#ircs://irc.libera.chat:+6697/pypa
+.. _Development IRC: https://kiwiirc.com/nextclient/#ircs://irc.libera.chat:+6697/pypa-dev
+.. _PSF Code of Conduct: https://github.com/pypa/.github/blob/main/CODE_OF_CONDUCT.md

vaksman_valeria_lab_4/venv/Lib/site-packages/pip-23.2.1.dist-info/WHEEL

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+Wheel-Version: 1.0
+Generator: bdist_wheel (0.40.0)
+Root-Is-Purelib: true
+Tag: py3-none-any
+

vaksman_valeria_lab_4/venv/Lib/site-packages/pip-23.2.1.dist-info/entry_points.txt

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+[console_scripts]
+pip = pip._internal.cli.main:main
+pip3 = pip._internal.cli.main:main
+pip3.11 = pip._internal.cli.main:main

vaksman_valeria_lab_4/venv/Lib/site-packages/pip-23.2.1.dist-info/top_level.txt

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+pip