[issue15464] ssl: add set_msg_callback function

[Antoine Pitrou]

Antoine Pitrou added the comment:

Thiébaud, I haven't reviewed the patch in detail, but why does the callback only receive the buffer contents? At the minimum, I think it should also receive write_p (whether the packet is an incoming or outgoing message is a rather useful piece of information).

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stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15464>
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