XML request/response logger

[jbarbede]

Currently, with debug mode, you echo any XML send request/received response and it is already a great help.

We used to log these XML requests and responses in a database. It is really useful when a command failed and we can't exactly determine why (API response sometimes are not really clear). Like that, we can find a request and its response and send it to the API support.

Maybe we should be able to configure a logger when creating a Client object.

[lifeofguenter]

Yes that would be a great idea, basically I would suggest to implement something via monolog and fallback to "echo" - so it would basically be a composer-suggests/recommends instead of requirement.

[lifeofguenter]

Ok this might be a little more complicated:

• the reason I implemented (rather shitty) the "log" method is so I can output each byte as soon as it arrives - this is so I can really see everything until to the point of a crash
• implementing a logger means I would have to call the logger after I received all bytes (which might not work on a crash) and to make it have more sense it would have to add some useful information, like "what command was actually being made" - "what was the actual received xml data"

So conclusion:

• logger will be a config option (psr-log interface)
• it is independent of the current debug
• it will additionally log the Frame class name that was sent

[jbarbede]

We used to log also the command type (the Frame class in this case) so the whole conclusion sounds perfect.