Add week 5 materials

materials/05-indirect-comm/seminar/dead_letter/dead_letter_consumer/Dockerfile

@@ -0,0 +1,13 @@
+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 dead_letter_consumer.py"]

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

@@ -0,0 +1,15 @@
+import pika
+import time
+
+connection = pika.BlockingConnection(pika.ConnectionParameters(host='rabbitmq', port=5672))
+channel = connection.channel()
+
+
+def callback(ch, method, properties, body):
+    print('got new unprocessed message (body = "{}")'.format(body))
+    ch.basic_ack(delivery_tag=method.delivery_tag)
+
+
+time.sleep(1)
+channel.basic_consume(queue='unprocessed_logs', on_message_callback=callback)
+channel.start_consuming()