Merge pull request 'nikolaeva_yana_lab_4' (#338) from nikolaeva_yana_lab_4 into nikolaeva_yana_lab_3

Reviewed-on: #338

nikolaeva_yana_lab_4/Dockerfile

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+FROM python:3.9-slim
+
+RUN pip install pika
+
+WORKDIR /app
+COPY . /app
+
+CMD ["python", "publisher.py"]

nikolaeva_yana_lab_4/README.md

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+### Лабораторная работа №4 - Работа с брокером сообщений
+
+#### Задание
+
+1. Установить брокер сообщений RabbitMQ.
+2. Пройти уроки 1, 2 и 3 из RabbitMQ Tutorials на любом языке программирования.
+3. Продемонстрировать работу брокера сообщений.
+
+#### Описание работы программы:
+
+- **Класс Publisher** успешно осуществляет отправку сообщений своим клиентам.
+  
+- **Класс Consumer1** принимает и обрабатывает сообщения с задержкой в 3 секунды, что можно заметить на видео.
+
+- **Класс Consumer2** мгновенно принимает и обрабатывает сообщения.
+
+### Скрины во вложениях
+
+## Видео 
+
+https://cloud.mail.ru/public/kzJ8/hUmC6959a

nikolaeva_yana_lab_4/consumer_1.py

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+import pika
+import time
+
+def callback(ch, method, properties, body):
+    print(f" [Consumer 1] {body.decode('utf-8')}")
+    time.sleep(3)
+    ch.basic_ack(delivery_tag=method.delivery_tag)
+
+connection = pika.BlockingConnection(pika.ConnectionParameters(host='rabbitmq'))
+channel = connection.channel()
+channel.exchange_declare(exchange='lunch_logs', exchange_type='fanout')
+
+queue_name = "lunch_queue_slow"
+channel.queue_declare(queue=queue_name)
+channel.queue_bind(exchange='lunch_logs', queue=queue_name)
+
+print(' [*] Consumer 1 waiting for logs. To exit press CTRL+C')
+
+channel.basic_consume(queue=queue_name, on_message_callback=callback, auto_ack=False)
+channel.start_consuming()

nikolaeva_yana_lab_4/consumer_2.py

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+import pika
+
+def callback(ch, method, properties, body):
+    print(f" [Consumer 2] {body.decode('utf-8')}")
+    ch.basic_ack(delivery_tag=method.delivery_tag)
+
+connection = pika.BlockingConnection(pika.ConnectionParameters(host='rabbitmq'))
+channel = connection.channel()
+channel.exchange_declare(exchange='lunch_logs', exchange_type='fanout')
+
+
+queue_name = "lunch_queue_fast"
+channel.queue_declare(queue=queue_name)
+channel.queue_bind(exchange='lunch_logs', queue=queue_name)
+
+print(' [*] Consumer 2 waiting for logs. To exit press CTRL+C')
+
+channel.basic_consume(queue=queue_name, on_message_callback=callback, auto_ack=False)
+channel.start_consuming()

nikolaeva_yana_lab_4/docker-compose.yml

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+version: '3'
+
+services:
+  rabbitmq:
+    image: rabbitmq:3-management
+    container_name: rabbitmq_TEST
+    ports:
+      - "5672:5672"
+      - "15672:15672"
+    environment:
+      RABBITMQ_DEFAULT_USER: guest
+      RABBITMQ_DEFAULT_PASS: guest
+    healthcheck:
+      test: ["CMD", "rabbitmqctl", "status"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  publisher:
+    build:
+      context: .
+    container_name: publisher
+    environment:
+      - PYTHONUNBUFFERED=1
+    command: python publisher.py
+    depends_on:
+      rabbitmq:
+        condition: service_healthy
+
+  consumer_1:
+    build:
+      context: .
+    container_name: consumer_1
+    environment:
+      - PYTHONUNBUFFERED=1
+    command: python consumer_1.py
+    depends_on:
+      rabbitmq:
+        condition: service_healthy
+
+  consumer_2:
+    build:
+      context: .
+    container_name: consumer_2
+    environment:
+      - PYTHONUNBUFFERED=1
+    command: python consumer_2.py
+    depends_on:
+      rabbitmq:
+        condition: service_healthy

nikolaeva_yana_lab_4/publisher.py

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+import pika
+import time
+import random
+
+connection = pika.BlockingConnection(pika.ConnectionParameters(host='rabbitmq'))
+channel = connection.channel()
+channel.exchange_declare(exchange='lunch_logs', exchange_type='fanout')
+
+events = [
+    "Новый заказ на завтрак",
+    "Новый заказ на обед",
+    "Новый заказ на ужин",
+    "Пользователь запросил меню"
+]
+
+while True:
+    message = random.choice(events)
+    channel.basic_publish(exchange='lunch_logs', routing_key='', body=message)
+    print(f" [x] Sent {message}")
+    time.sleep(1)

nikolaeva_yana_lab_4/tutorial_1/receive.py

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+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)

nikolaeva_yana_lab_4/tutorial_1/send.py

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+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()

nikolaeva_yana_lab_4/tutorial_2/new_task.py

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+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()

nikolaeva_yana_lab_4/tutorial_2/worker.py

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+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()

nikolaeva_yana_lab_4/tutorial_3/emit_log.py

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+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()

nikolaeva_yana_lab_4/tutorial_3/receive_logs.py

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+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()