Add week 5 materials

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

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

@@ -0,0 +1,16 @@
+import pika
+import sys
+
+connection = pika.BlockingConnection(pika.ConnectionParameters(host='rabbitmq', port=5672))
+channel = connection.channel()
+
+channel.queue_declare(queue='unprocessed_logs')
+channel.queue_declare(queue='logs', arguments={
+    'x-max-priority': 5,
+    'x-dead-letter-exchange' : '',
+    'x-dead-letter-routing-key' : 'unprocessed_logs'})
+
+channel.basic_publish(exchange='', routing_key='logs', body='warning', properties=pika.BasicProperties(priority=1))
+channel.basic_publish(exchange='', routing_key='logs', body='error', properties=pika.BasicProperties(priority=5))
+channel.basic_publish(exchange='', routing_key='logs', body='info', properties=pika.BasicProperties(priority=1))
+connection.close()