Detecting and capturing underlying problems and event with pn_messenger

[Frank Quinn <fq...@nyx.com>]

Hi Folks,

During testing, we discovered that sometimes when a pn_messenger_send is called, that it will not return an error code in the event of failure. This is despite the fact that pn_messenger_send was being used in blocking mode. This seemed to be caused in the line checking connection state which does not seem to return any errors and instead simply prints them to screen:

messenger.c:578 (latest svn)

} else if (pn_connector_closed(ctor) && !(pn_connection_state(conn) & PN_REMOTE_CLOSED)) {
    pn_error_report("CONNECTION", "connection aborted");

It did draw our attention though to how we could use messenger to detect errors in general - perhaps those which are happening asynchronously under the hood which the application developer will be oblivious to unless some sort of callback can be generated while initializing the pn_messenger methods to handle it? I see modifications are being made to messenger to make it non-blocking as well which is great, but it may make the requirement to detect errors asynchronously all the more prominent.

Is this something which is available at the moment which I am missing or is it in planning / up for discussion?

Think that's the last question for a while - thanks folks!

Cheers,
Frank

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