Tracelog support for zserver
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Zope 3/ZServer tracelog

This package implements a Zope2-style (extended) tracelog. A tracelog is a kind of access log that records several low-level events for each request. Each log entry starts with a record type, a request identifier and the time. Some log records have additional data.

To create a trace log, you need to:

  • Include the zc.zservertracelog configuration in your site zcml file:

    <include package="zc.zservertracelog" />
  • Define where messages to the 'zc.tracelog' logger should go. In your zope.conf file, use something like:

      name zc.tracelog
      propagate false
        format %(message)s
        path /home/jim/p/zc.zservertracelog/dev/trace.log

The analysis script, tracereport, can be used to analyze the trace log. I recommend the html output option.

Trace log records

  • Request begins:

    B -1214390740 2007-04-27T20:16:55.582940 GET /

    Includes the request method and path.

  • Got request input:

    I -1214390740 2007-04-27T20:16:55.605791 0

    Includes the request content length.

  • Entered application thread:

    C -1214390740 2007-04-27T20:16:55.703829

  • Database activity

    D -1223774356 2007-04-27T20:16:55.890371 42 0 x 2 1

    The data includes objects loaded and saved for each database except databases for which there was no activity. Note that it's common for the main database to be unnamed, and the data often starts with objects loaded and saved for the main database.

    In the example above, 42 objects were loaded from the unnamed database. Two objects were loaded from and one saved to the database named 'x'.

    If requests are retried due to conflict errors, then there will be multiple 'D' records.

  • Application done:

    A -1223774356 2007-04-27T20:16:55.890371 500 84

    Includes the response content length.

  • Request done:

    E -1223774356 2007-04-27T20:16:55.913855

In addition, application startup is logged with an 'S' record:

S 0 2007-04-27T20:24:29.013922

Tracelog extension records are prefixed with a '-':

  • -1223774356 2008-09-12T15:51:05.559302 zc.example.extension message