Add week 5 materials

materials/05-indirect-comm/seminar/topic/consumer_critical/Dockerfile

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+FROM python:3.8
+
+RUN mkdir /root/app/
+WORKDIR /root/app/
+
+RUN pip install pika
+
+COPY . .
+
+ENV PYTHONPATH "${PYTHONPATH}:/root/app/"
+EXPOSE 5000
+
+CMD ["bash", "-c", "while ! curl -s rabbitmq:15672 > /dev/null; do echo waiting for rabbitmq; sleep 3; done; python -u consumer_critical.py"]

materials/05-indirect-comm/seminar/topic/consumer_critical/consumer_critical.py

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+import os
+import pika
+
+
+if __name__ == '__main__':
+    connection = pika.BlockingConnection(pika.ConnectionParameters(host='rabbitmq', port=5672))
+    channel = connection.channel()
+
+    channel.exchange_declare(exchange='topic_logs', exchange_type='topic')
+
+    result = channel.queue_declare(queue='', exclusive=True)
+    queue_name = result.method.queue
+
+    channel.queue_bind(exchange='topic_logs', queue=queue_name, routing_key='*.critical')
+
+    print(' [*] Waiting for logs.')
+
+    def callback(ch, method, properties, body):
+        print(f" [x] {method.routing_key}:{body.decode()}")
+        ch.basic_ack(delivery_tag=method.delivery_tag)
+
+    channel.basic_consume(queue=queue_name, on_message_callback=callback)
+
+    channel.start_consuming()