Comments (4)
Hello @chemiron
Well if the doc says so .. it's a bug.
Alternatively, you can call the declare
method with passive=True : if the resource does not exist it will raise.
for instance : https://groups.google.com/forum/#!topic/rabbitmq-users/ZTfVwe_HYXc
from aioamqp.
There's no way to just check for existence with AMQP, one can just assert. Ie, if exchange does exist, then it works, if not, channel is closed with parameters implying the reason.
The same goes for exchange.declare with passive=True. Channel is closed if it doesn't exist.
So if you want to check if an exchange exists, open a new channel, exchange.declare (with passive or without depending on if you want to create the exchange if it doesn't exist) and then
- receive exchange.declare-ok if it was there, close channel yourself
- get channel.close from broker with parameters class = exchange and method = declare, and probably reply_code 404 (for not found).
If implementing that to a library, it would probably have to be a method of the connection, because of the opening and closing of a new one shot channel.
from aioamqp.
I can confirm that publishing to non existing exchange (amqp ver. 0.11.0), while in the consumer, closes channel (as it should be from server side) but lib does not fire exception nor on_error callback. So where is no way how to find out if publish succeeded except check for .is_open.
from aioamqp.
Hello,
Sorry for the late response, but you have to call confirm_select
:
#!/usr/bin/env python
"""
Rabbitmq.com pub/sub example
https://www.rabbitmq.com/tutorials/tutorial-four-python.html
"""
import asyncio
import aioamqp
import sys
async def exchange_routing():
try:
transport, protocol = await aioamqp.connect('localhost', 5672)
except aioamqp.AmqpClosedConnection:
print("closed connections")
return
channel = await protocol.channel()
await channel.confirm_select()
exchange_name = 'direct_logs'
severity = sys.argv[1] if len(sys.argv) > 1 else 'info'
message = ' '.join(sys.argv[2:]) or 'Hello World!'
#await channel.exchange(exchange_name, 'direct')
pu = await channel.publish(message, exchange_name=exchange_name, routing_key=severity)
print(" [x] Sent %r" % (message,))
await protocol.close()
transport.close()
asyncio.get_event_loop().run_until_complete(exchange_routing())
which produce :
$ python examples/emit_log_direct.py
only PLAIN login_method is supported, falling back to AMQPLAIN
Traceback (most recent call last):
File "examples/emit_log_direct.py", line 37, in <module>
asyncio.get_event_loop().run_until_complete(exchange_routing())
File "/usr/local/lib/python3.6/asyncio/base_events.py", line 468, in run_until_complete
return future.result()
File "examples/emit_log_direct.py", line 29, in exchange_routing
pu = await channel.publish(message, exchange_name=exchange_name, routing_key=severity)
File "/home/benoit/Projects/blue/aioamqp/aioamqp/channel.py", line 706, in publish
await fut
aioamqp.exceptions.ChannelClosed: (404, "NOT_FOUND - no exchange 'direct_logs' in vhost '/'")
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Related Issues (20)
- rabbitmqctl list_queues via aioamqp HOT 1
- Cleanup login method HOT 1
- channel.basic_consume API docs HOT 2
- AttributeError: 'Channel' object has no attribute 'basic_ack' HOT 1
- Message Properties: 'type' property HOT 7
- If value passed to 'x-message-ttl' is greater than or equal 128, then invalid Negative value is sending to server HOT 3
- Channel publish requires a lock
- Python3.8
- Init login method default value 'AMQPLAIN' HOT 2
- Testing with pamqp 3.0 HOT 6
- Is there any usage example or tutorial documents HOT 1
- Publishing to a non-existing exchange does not raise errors HOT 1
- Republish the pypi docs to pick up Python3.9 HOT 3
- Support server-generated queue names
- AmazonMQ issues on `queue_declare` HOT 1
- Ready for release on pypi? HOT 1
- Channel.basic_server_ack doesn't respect `multiple` flag HOT 3
- Unable to subscribe to a queue with wildcard (asterisk) HOT 3
- using tag uri scheme for queue and exchange names are not longer possible HOT 1
- No longer handling CancelledError on protocol.run
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