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Re-establish Backend::createBackend 

This partially reverts fcf7f7d6. The original intention was to have
no library code reading config. Moving code snippets to another lib
doesn't solve this. We need quick & easy access to a monitoring
backend, on CLI, in other modules and so forth. Duplicating so much
code again and again is not an option.

I prefer the former way of doing things unless we find a better
solution.
This commit is contained in:
Thomas Gelf 2014-05-06 15:01:43 +00:00 committed by Eric Lippmann
parent fcf7f7d6dc
commit d389d8e0f0
1 changed files with 51 additions and 0 deletions
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51
modules/monitoring/library/Monitoring/Backend.php
View File

@ -8,6 +8,10 @@ use Icinga\Exception\ProgrammingError;
use Icinga\Data\Selectable;
use Icinga\Data\Queryable;
use Icinga\Application\Config as IcingaConfig;
use Icinga\Data\ResourceFactory;
use Icinga\Exception\ConfigurationError;
/**
* Data view and query loader tied to a backend type
*/
@ -39,6 +43,53 @@ class Backend implements Selectable, Queryable
$this->type = $type;
}
/**
* Create a backend
*
* @param string $backendName Name of the backend or null for creating the default backend which is the first INI
* configuration entry not being disabled
*
* @return Backend
* @throws ConfigurationError When no backend has been configured or all backends are disabled or the
* configuration for the requested backend does either not exist or it's disabled
*/
public static function createBackend($backendName = null)
{
$allBackends = array();
$defaultBackend = null;
foreach (IcingaConfig::module('monitoring', 'backends') as $name => $config) {
if (!(bool) $config->get('disabled', false) && $defaultBackend === null) {
$defaultBackend = $config;
}
$allBackends[$name] = $config;
}
if (empty($allBackends)) {
throw new ConfigurationError('No backend has been configured');
}
if ($defaultBackend === null) {
throw new ConfigurationError('All backends are disabled');
}
if ($backendName === null) {
$backendConfig = $defaultBackend;
} else {
if (!array_key_exists($backendName, $allBackends)) {
throw new ConfigurationError('No configuration for backend ' . $backendName);
}
$backendConfig = $allBackends[$backendName];
if ((bool) $backendConfig->get('disabled', false)) {
throw new ConfigurationError(
'Configuration for backend ' . $backendName . ' available but backend is disabled'
);
}
}
$resource = ResourceFactory::createResource(ResourceFactory::getResourceConfig($backendConfig->resource));
if ($backendConfig->type === 'ido' && $resource->getDbType() !== 'oracle') {
// TODO(el): The resource should set the table prefix
$resource->setTablePrefix('icinga_');
}
return new Backend($resource, $backendConfig->type);
}
/**
* Backend entry point
*