.. _debug-toolbar_pyramid:

The pyramid debug toolbar

=========================

The pyramid webserver comes with an integrated `debug toolbar

<https://docs.pylonsproject.org/projects/pyramid_debugtoolbar/>`_ that offers a

lot of information to ease development. To ease the development process in

CubicWeb a series of custom debug panels have been developped especially for

that purpose.

To use the pyramid debug toolbar in CubicWeb, you need to:

* install it either by doing a `pip install pyramid_debugtoobar` or following

  `the official installation instructions

  <https://docs.pylonsproject.org/projects/pyramid_debugtoolbar/#installation>`_

* launch the pyramid command adding the `-t/--toolbar` argument to enable it

  like so: `cubicweb-ctl pyramid my_instance -t` (you probably want to add `-D`

  to activate the debug mode during development)

* navigate to the website and click on the icon on the right like on this screenshot:

.. image:: ../../images/debug_toolbar_icon.png

And you'll have access to the debug toolbar content for this page.

Custom panels

-------------

A series of custom debug panels have been written to offer more useful debug

information during development. Here is the list:

General 'CubicWeb' Panel

~~~~~~~~~~~~~~~~~~~~~~~~

Provides:

* currently selected controller for this with and uri/requests information

* current instance configuration, options that differs from default ones are in bold

* a list of useful links like on the default CW home

Screenshot:

.. image:: ../../images/debugtoolbar_general_panel.png

Registry Decisions Panel

~~~~~~~~~~~~~~~~~~~~~~~~

Provides:

* a list of all decisions taken in all registry during this page construction

* the arguments given to take the decision

* all the selection entities during decisions with their score

* which one has won if any

.. image:: ../../images/debugtoolbar_registry_decisions_panel.png

Registry Store

~~~~~~~~~~~~~~

Provides:

* a listing of all the content of the different registries

* for each entity its detailed information

.. image:: ../../images/debugtoolbar_registry_content_panel.png

RQL

~~~

Provides:

* a list of all executed RQL queries during this page creation

* for each RQL query all the generated SQL queries

* detail information like the result, the args and the description of each query

* the call stack on each query to see where it has been called

.. image:: ../../images/debugtoolbar_rql_panel.png

.. image:: ../../images/debugtoolbar_rql_traceback_panel.png

SQL

~~~

Provides:

* a list of all executed SQL queries during this page creation

* for each SQL query the RQL query that has generated it, if any (some aren't)

* detail information like the result, the args and if the query has rollback

* the call stack on each query to see where it has been called

.. image:: ../../images/debugtoolbar_sql_panel.png

Accessing the sources of the class/functions/method listing the debug panels

----------------------------------------------------------------------------

A traversal of all those custom panels is the see the source code of all

listing class/functions/methods. You can access those by:

* clicking on the `[source]` close to the target when available

* clicking on the file path in the traceback stack

.. image:: ../../images/debugtoolbar_show_source_link.png

.. image:: ../../images/debugtoolbar_traceback_source_link.png

You be sent to a page looking like this:

.. image:: ../../images/debugtoolbar_show_source.png

Contributing

------------

All source code for the custom panels is located `here

<https://hg.logilab.org/master/cubicweb/file/tip/cubicweb/pyramid/debugtoolbar_panels.py>`_

and the documentation of how to write `custom toolbar panels here

<https://docs.pylonsproject.org/projects/pyramid_debugtoolbar/en/latest/#adding-custom-panels>`_.