Include more information in log messages

[edevil]

Sometimes I get messages in the log (syslog) like these:

[uwsgi-http client_addr: XXX.XXX.XXX.XXX client_port: 5857] hr_write(): Broken pipe [plugins/http/http.c line 429]
IOError: write error

or

uwsgi_response_write_body_do() TIMEOUT !!!
IOError: write error

and when there are a lot of log messages it can be difficult to correlate them to the rest of the request processing. Would it be possible to include information like worker pid, worker id, some request id? I normally use the greenlet id as a "request id" and pass it with set_logvar but these log messages cannot be formatted.

Thanks.

[unbit]

this is somewhat related to #57 my idea is that by default any uwsgi_log and uwsgi_error should report the UWSGI_REQUEST_ID (and the timestamp). In addition to this an option should allow to specify which additional request vars to report. This is something that should be ready pretty soon