examples/kombu_*.py: Add missing methods and use jsonrpc a non-durable queue

[bernhardkaindl]

Implement the sum(a, b) and tick RPC endpoints for kombu_client.py and aio_pika_client.py and use queue_args={"durable": False} to be able to connect to the "jsonrpc" queue created by examples/aio_pika_*.py. Makes it also interoperable with these examples.

examples/kombu_server.py and examples/kombu_client.py appear to have an issue communicating with each other: The RPC gets stuck very often, but server/client cross-operation with examples/aiopika*.py works fine.

This issue is present with the "jsonrpc" set to durable as well.

[codecov-commenter]

Codecov Report

Merging #60 (a16fada) into dev (6a4afe8) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev      #60   +/-   ##
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  Coverage   78.67%   78.67%           
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  Files          38       38           
  Lines        2377     2377           
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  Hits         1870     1870           
  Misses        507      507           

Flag	Coverage Δ
unittests	78.67% <ø> (ø)

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[dapper91]

@bernhardkaindl Did you manage to figure out why kombu client gets stuck?

[bernhardkaindl]

@bernhardkaindl Did you manage to figure out why kombu client gets stuck?

No, I see in the rabbitmq log that both stay connected, but the client does not continue sending requests:

From the kombu_server log, I see that the server sends the response for the sum method, but the client does not have any logger calls about sending requests or receiving responses.

I think this lack of logging in the kombu client should be fixed next to ease debugging the combu client in general - ok?

[dapper91]

@bernhardkaindl Could you report an issue, I suppose I have some guesses.

[dapper91]

approved

[bernhardkaindl]

Thanks, opened issue #66