I'm following up on Matt's idea of supplying a custom --log-format-regex that includes a custom parameter. I'm wondering how Piwik would know about the new custom parameter.

In PHP one would declare it this way:

#!div style="font-size: 80%"

#!php
piwikTracker.setCustomVariable(1, "VisitorType", "Member", "visit");
piwikTracker.trackPageView();

In Javascript this way:

#!div style="font-size: 80%"

#!javascript
_paq.push(['setCustomVariable','1','VisitorType','Member']);
_paq.push([ function() { var customVariable = this.getCustomVariable(1); }]);

The regex captures the parameter. An example log line includes the parameter: uname=anabella1234

#!div style="font-size: 80%"

#!python
(?:uname=)(?P<username>\S+)

Does the parameter have to be explicitly declared to be a CustomVariable in the Python request? Can the CustomVariable be defined in the Piwik configuration rather than be declared in the Python script? Would the a _cvar array have to be piggy-backed with the request?

I'm unsure of the mechanism to bind the parameter in Python to a custom variable in Piwik, but I just need a nudge in the right direction.

What I would try to achieve, is to first capture the parameter as you point out, and once captured, to append it to the request URL, eg. &cvar= which is a JSON value containing your custom variable username. Does it make sense?

Issue was moved to the new repository for Piwik Log Analytics: https://github.com/piwik/piwik-log-analytics/issues

refs #7163