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repoze.errorlog README
======================

Overview
--------

This package implements a WSGI middleware filter which intercepts
exceptions and writes them to a Python logging module channel (or the
``wsgi.errors`` filehandle, if no channel is configured).  It also
allows the browsing of limited exception history via a browser UI.

Configuration
-------------
    
If you want to use the default configuration, you can just include the
filter in your application's PasteDeploy pipeline, e.g.::

  [pipeline:main]
  pipeline = egg:Paste#cgitb
             egg:repoze.errorlog#errorlog
             yourapp

If you want to override the default configuration, you need to make a
separate section for the filter.  The Paste configuration options at
this time are ``channel``, ``keep`` and ``path``.  To configure
repoze.errorlog to use the ``Repoze`` logging channel, which sends to
the logging channel as if you had send to a logger from code where
you did 'from logging import getLogger; logger = getLogger("Repoze")'
and to keep 50 tracebacks around for through-the-web exception
viewing, configure like so::

   [filter:errorlog]
   channel = Repoze
   keep = 50
   path = /__my_error_log__
   ignore = RuntimeError my.module:MyError

By default, no channel is configured, and tracebacks are sent to the
``wsgi.errors`` file handle (which should cause the errors to show up in
your server's error log).  By default, the exception history length
('keep') is 20.

By default, the error log's path is ``/__error_log__``; you can change
this as necessary for your deployment.

The ignore parameter prevents the exceptions named from being logged
or kept in exception history (although they are reraised).  By
default, no exceptions are ignored.

To use the reconfigured filter in the pipeline::

   [pipeline:main]
   pipeline = egg:Paste#cgitb
              errorlog
              yourapp

If you don't use PasteDeploy, you can configure the ErrorLog
middleware manually::

  app = ErrorLog(app, channel=None, keep=20, path='/__error_log__', 
                 ignored_exceptions=())

Usage
-----

To view recent tracebacks via your browser (exception history), visit
the ``/__error_log__`` path at the hostname represented by your server.
A view will be presented showing you all recent tracebacks.  Clicking
on one will bring you to a page which shows you the traceback and a
rendering of the WSGI environment which was present at the time the
exception occurred.

Integrating
-----------

When repoze.errorlog is placed into the pipeline, two keys are placed
into the wsgi environment on every request (even when an exception is
not raised and caught by repoze.errorlog)::

      repoze.errorlog.path -- the path at which the errorlog is configured

      repoze.errorlog.entryid -- the entry id of the next error

 Middleware and applications that catch exceptions can compose a URL
 to the current error (for helpful development feedback) when they
 know repoze.errorlog is in the pipeline by using the following code::

      from paste.request import construct_url
      path = environ['repoze.errorlog.path']
      entry = environ['repoze.errorlog.entryid']
      url = construct_url(environ, path_info=path, 
                          querystring='entry=%s' % entry)


Reporting Bugs / Development Versions
-------------------------------------

Visit http://bugs.repoze.org to report bugs.  Visit
http://svn.repoze.org to download development or tagged versions.
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