Add week 5 materials

materials/05-indirect-comm/seminar/dead_letter/consumer/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.py"]

materials/05-indirect-comm/seminar/dead_letter/consumer/consumer.py

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+import pika
+import time
+
+connection = pika.BlockingConnection(pika.ConnectionParameters(host='rabbitmq', port=5672))
+channel = connection.channel()
+
+
+def callback(ch, method, properties, body):
+    if body.startswith(b'warning'):
+        print('got new warning (body = "{}")'.format(body))
+        ch.basic_ack(delivery_tag=method.delivery_tag)
+    elif body.startswith(b'error'):
+        print('got new error (body = "{}")'.format(body))
+        ch.basic_ack(delivery_tag=method.delivery_tag)
+    else:
+        ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
+
+
+time.sleep(1)
+channel.basic_consume(queue='logs', on_message_callback=callback)
+channel.start_consuming()