q,ex,binding scaffolded

main.py

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+import pika
+
+# this is the physical conn
+connection = pika.BlockingConnection(pika.ConnectionParameters("localhost"))
+# a channel is a lightweight multiplexer over it
+channel = connection.channel()
+
+# first the exchanges
+
+# this is A DECLARE, basically so can run multuple  times
+# .x = exchange
+channel.exchange_declare(
+    exchange="orders.x", exchange_type="direct", durable=True)
+# .dlx = dead letter exchange for failed messages
+channel.exchange_declare(exchange="orders.dlx",
+                         exchange_type="direct", durable=True)
+# the exchange_types are
+# - direct: exact key match for routing
+# - topic: pattern based
+# - fanout: all
+# - headers: defined in headers
+
+# then the queues
+# when changing settings, you might need to delete q from adming
+# as it'll aready exist and this declare does not delete
+channel.queue_declare(
+    queue="orders.q",
+    durable=True,
+    arguments={
+        #  what to do with "dead letters"
+        # which can be when consumder signals issue
+        # or q overflow
+        # or ttl stuff
+        "x-dead-letter-exchange": "orders.dlx",
+        "x-dead-letter-routing-key": "order.dead",
+    },
+)
+channel.queue_declare(queue="orders.processed.q", durable=True)
+channel.queue_declare(queue="orders.failed.q", durable=True)
+channel.queue_declare(queue="orders.dlq", durable=True)
+
+# then the bindings
+# these are rules on how exchange will route what message
+# read as, on order.x, if key is order.created, push to orders.q
+channel.queue_bind(exchange="orders.x", queue="orders.q",
+                   routing_key="order.created")
+channel.queue_bind(exchange="orders.x", queue="orders.processed.q",
+                   routing_key="order.processed")
+channel.queue_bind(exchange="orders.x", queue="orders.failed.q",
+                   routing_key="order.failed")
+channel.queue_bind(exchange="orders.dlx", queue="orders.dlq",
+                   routing_key="order.dead")
+
+
+connection.close()