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From "Graham Dumpleton (JIRA)" <j...@apache.org>
Subject [jira] Created: (MODPYTHON-180) publisher wrongly generating warning that there is 'nothing to publish'
Date Sun, 30 Jul 2006 02:58:15 GMT
publisher wrongly generating warning that there is 'nothing to publish'

                 Key: MODPYTHON-180
                 URL: http://issues.apache.org/jira/browse/MODPYTHON-180
             Project: mod_python
          Issue Type: Bug
          Components: publisher
    Affects Versions: 3.3
            Reporter: Graham Dumpleton

Publisher handler contains the code:

    # we log a message if nothing was published, it helps with debugging
    if (not published) and (req.bytes_sent==0) and (req.next is None):
        log=int(req.get_config().get("PythonDebug", 0))
        if log:
            req.log_error("mod_python.publisher: nothing to publish.")

The idea is that if the publisher didn't generate any output and simply returned None, that
a warning would be generated which might be noticed by a developer and thus be helpful to
debugging problems.

Problem is that "req.bytes_sent" is only actually non zero when data is flushed and actually
written back to the client by Apache. It does not take into consideration any buffered data.

In other words, if "req.write()" is used but second optional argument is always being set
to 0 indicating that data should not be flushed, then publisher will wrongly say nothing actually
got published.

Because the PSP classes are no longer flushing data so that output filters like "CONTENT_LENGTH"
will work, this will mean you will get this warning all the time when using code like:

  from mod_python import apache, psp

  def index(req):
      page = psp.PSP(req, 'echo.psp')

Question is, is there a way to determine from Apache that there is buffered data. We don't
really want to be adding another special flag in the mod_python request wrapper like req._content_type_set
do we???

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