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miscutil-remote-debugger.webdoc
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## -*- mode: html; coding: utf-8; -*-
## This file is part of Invenio.
## Copyright (C) 2011 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
<!-- WebDoc-Page-Title: Remote Debugger -->
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<h2>Contents</h2>
<strong>1. <a href="#1">Introduction</a></strong><br />
<strong>2. <a href="#2">Configuration</a></strong><br />
<a name="1"></a><h2>1. Introduction</h2>
<p>The remote debugger is a module that makes it easy to plug in
different debugging facilities. Debugging is automatically activated
using url param <i>debug</i> and can be switched on/off on demand.
The module itself is not a debugger, but facilitates calling of
diverse debuggers (pdb, gpdb, pydev). This module is <b>meant for
Invenio developers and other people who want to edit the Python code, please
do not use this module in production environment!</b>.</p>
<p>Debug mode is enabled by passing debug=X in the url parameter, example:
<blockquote>
<pre>
http://invenio-ubu/record/94/keywords?ln=en&debug=3
</pre>
</blockquote>
This will run the web application in an interactive mode, debugger in this case is Eclipse/Pydev.
</p>
<p>From the module documentation:
<blockquote>
<pre>
Each debugger has its own number:
local winpdb: debug=1
remote winpdb: debug=2
remote pydev: debug=3
If debug parameter is empty, the code runs normally. You can also
roll out your own debugging functions, assign it new number - look into
get_debugger()
If you want to change behaviour of the debugger interactively, you can
pass arguments encoded in the url, example:
http://someurl/collection/X?debug=3|ip:192.168.31.1|port:9999|stderr:0
look at the method signature of each debugger function to see available
arguments.
</pre>
</blockquote>
<a name="2"></a><h2>2. Configuration</h2>
If you want to use the remote debugger for Invenio, then make sure
your local <code>remote_debugger_config.py</code> file contains:
<blockquote>
<pre>
CFG_REMOTE_DEBUGGER_ENABLED = 1
</pre>
</blockquote>
And if also want to edit modules while Apache is running and see the results immediately,
this will force Apache to reload the changed python modules located inside 'lib/python/invenio'
but it will not reload anything if you edit var/www/*.py modules.
<blockquote>
<pre>
CFG_REMOTE_DEBUGGER_WSGI_RELOAD = ['lib/python/invenio/*.py']
</pre>
</blockquote>
For a more detailed configuration and instructions how to activate individual debuggers, please
see the comments inside the
remote_debugger.py module -- as this module is for developers, I assume you will find it
very easy to understand the rest.
<strong>Note:</strong> if you are using <em>winpdb</em>, then you may
want to set the number of WSGI processes to 1 in your
<code>/opt/invenio/etc/apache/invenio-apache-vhost.conf</code>.

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