Pulling out channel setup into common bits

as was suggested in book.

sylvilagus/python/sylvilagus/chapter02/hello_world.py

@@ -0,0 +1,16 @@
+import pika
+
+
+def get_channel():
+    credentials = pika.PlainCredentials('guest', 'guest')
+    conn_params = pika.ConnectionParameters('localhost',
+                                            credentials=credentials)
+    channel = pika.BlockingConnection(conn_params).channel()
+    channel.exchange_declare(exchange='hello-exchange',
+                             type='direct',
+                             passive=False,
+                             durable=True,
+                             auto_delete=False)
+
+    return channel
+

sylvilagus/python/sylvilagus/chapter02/hello_world_consumer.py

@@ -4,6 +4,8 @@ import sys
 
 import pika
 
+from sylvilagus.chapter02 import hello_world
+
 
 def msg_consumer(channel, method, header, body):
     channel.basic_ack(delivery_tag=method.delivery_tag)
@@ -16,16 +18,7 @@ def msg_consumer(channel, method, header, body):
 
 
 def main():
-    credentials = pika.PlainCredentials('guest', 'guest')
+    channel = hello_world.get_channel()
-    conn_params = pika.ConnectionParameters('localhost',
-                                            credentials=credentials)
-    conn_broker = pika.BlockingConnection(conn_params)
-    channel = conn_broker.channel()
-    channel.exchange_declare(exchange='hello-exchange',
-            type='direct',
-            passive=False,
-            durable=True,
-            auto_delete=False)
 
     channel.queue_declare(queue='hello-queue')
     channel.queue_bind(queue='hello-queue',

sylvilagus/python/sylvilagus/chapter02/hello_world_producer.py

@@ -4,18 +4,11 @@ import sys
 
 import pika
 
+from sylvilagus.chapter02 import hello_world
+
 
 def main(args=sys.argv[:]):
-    credentials = pika.PlainCredentials('guest', 'guest')
+    channel = hello_world.get_channel()
-    conn_params = pika.ConnectionParameters('localhost',
-                                            credentials=credentials)
-    conn_broker = pika.BlockingConnection(conn_params)
-    channel = conn_broker.channel()
-    channel.exchange_declare(exchange='hello-exchange',
-                             type='direct',
-                             passive=False,
-                             durable=True,
-                             auto_delete=False)
 
     msg = args[1]
     msg_props = pika.BasicProperties()