True, but that's just access log, not error log. I need the additional information (such as request headers) attached to the error log messages, not the access log messages.
One other possibility I was considering was just to have my module, on a per-request basis, append the error log messages passed into the hook function to a note in the notes table (similar to how ap_log_rerror works with the "error-note" note except that repeated error log strings would append) and then use a CustomLog access log to log the info I care about and the accumulated note. Doing it that way wouldn't be the end of the world, but: - it means that nothing gets written out until the log_transaction phase, which could be problematic for error info during broken/long-runing requests - appending to a mostly-unbounded (I could set some crazy upper limit) buffer is not the fastest thing in the world David On Fri, Feb 19, 2010 at 10:54 AM, <mcqueenor...@gmail.com> wrote: > Are you aware of the custom log formats and how you can add headers to the > log lines and put the in an arbitrary file? > > ------Original Message------ > From: David Sklar > To: modules-dev@httpd.apache.org > ReplyTo: modules-dev@httpd.apache.org > Subject: error_log hook > Sent: Feb 19, 2010 7:42 AM > > I am attempting to write a module that uses the error_log hook to > augment error log messages with some custom information (some items > from r->headers_in, mostly). > > Splatting *additional* information to the already-configured ErrorLog > is not too difficult by attaching a function to the hook, building > whatever string I want in the function, and then apr_file_puts()ing my > string to s->error_log. > > Additionally, it looks like by borrowing logic similar to what's in, > e.g. mod_log_forensic, I can add a custom directive (e.g. > MyFancyErrorLog) that specifies a filename and have my > specially-formatted error log messages written to this other file as > well. (I'm explicitly ignoring pipes and syslog for the moment.) > > But what I'd *really* like to do is bypass the default error logging > entirely. That is, instead of having log_error_core (from > server/log.c) figure out the log level magic, format the error string > with client, referer, etc. log it to the ErrorLog and *then* call the > hook, I want my function to replace log_error_core. But I don't see an > obvious way to do that. Is there some way I can override > ap_log_error/ap_log_perror/ap_log_rerror and provide alternative > implementations that call something other than log_error_core ? > > Thanks for any advice, > David > > > Sent via BlackBerry by AT&T
