How to Create a custom Data Collector
How to Create a custom Data Collector¶
The Symfony Profiler delegates data collecting to data collectors. Symfony comes bundled with a few of them, but you can easily create your own.
Creating a custom Data Collector¶
Creating a custom data collector is as simple as implementing the
DataCollectorInterface:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | interface DataCollectorInterface
{
/**
* Collects data for the given Request and Response.
*
* @param Request $request A Request instance
* @param Response $response A Response instance
* @param \Exception $exception An Exception instance
*/
function collect(Request $request, Response $response, \Exception $exception = null);
/**
* Returns the name of the collector.
*
* @return string The collector name
*/
function getName();
}
|
The getName() method must return a unique name. This is used to access the
information later on (see How to Use the Profiler in a Functional Test for
instance).
The collect() method is responsible for storing the data it wants to give
access to in local properties.
Caution
As the profiler serializes data collector instances, you should not
store objects that cannot be serialized (like PDO objects), or you need
to provide your own serialize() method.
Most of the time, it is convenient to extend
DataCollector and
populate the $this->data property (it takes care of serializing the
$this->data property):
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | class MemoryDataCollector extends DataCollector
{
public function collect(Request $request, Response $response, \Exception $exception = null)
{
$this->data = array(
'memory' => memory_get_peak_usage(true),
);
}
public function getMemory()
{
return $this->data['memory'];
}
public function getName()
{
return 'memory';
}
}
|
Enabling custom Data Collectors¶
To enable a data collector, add it as a regular service in one of your
configuration, and tag it with data_collector:
- YAML
1 2 3 4 5
services: data_collector.your_collector_name: class: Fully\Qualified\Collector\Class\Name tags: - { name: data_collector }
- XML
1 2 3
<service id="data_collector.your_collector_name" class="Fully\Qualified\Collector\Class\Name"> <tag name="data_collector" /> </service>
- PHP
1 2 3 4
$container ->register('data_collector.your_collector_name', 'Fully\Qualified\Collector\Class\Name') ->addTag('data_collector') ;
Adding Web Profiler Templates¶
When you want to display the data collected by your data collector in the web debug toolbar or the web profiler, create a Twig template following this skeleton:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | {% extends 'WebProfilerBundle:Profiler:layout.html.twig' %}
{% block toolbar %}
{# the web debug toolbar content #}
{% endblock %}
{% block head %}
{# if the web profiler panel needs some specific JS or CSS files #}
{% endblock %}
{% block menu %}
{# the menu content #}
{% endblock %}
{% block panel %}
{# the panel content #}
{% endblock %}
|
Each block is optional. The toolbar block is used for the web debug
toolbar and menu and panel are used to add a panel to the web
profiler.
All blocks have access to the collector object.
Tip
Built-in templates use a base64 encoded image for the toolbar:
1 | <img src="data:image/png;base64,..." />
|
You can easily calculate the base64 value for an image with this little script:
1 2 3 | #!/usr/bin/env php
<?php
echo base64_encode(file_get_contents($_SERVER['argv'][1]));
|
To enable the template, add a template attribute to the data_collector
tag in your configuration. For example, assuming your template is in some
AcmeDebugBundle:
- YAML
1 2 3 4 5
services: data_collector.your_collector_name: class: Acme\DebugBundle\Collector\Class\Name tags: - { name: data_collector, template: "AcmeDebugBundle:Collector:templatename", id: "your_collector_name" }
- XML
1 2 3
<service id="data_collector.your_collector_name" class="Acme\DebugBundle\Collector\Class\Name"> <tag name="data_collector" template="AcmeDebugBundle:Collector:templatename" id="your_collector_name" /> </service>
- PHP
1 2 3 4 5 6 7
$container ->register('data_collector.your_collector_name', 'Acme\DebugBundle\Collector\Class\Name') ->addTag('data_collector', array( 'template' => 'AcmeDebugBundle:Collector:templatename', 'id' => 'your_collector_name', )) ;
This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.