public function getConfigTreeBuilder()
{
$treeBuilder = new TreeBuilder();
$rootNode = $treeBuilder->root('beberlei_metrics');
$rootNode->children()->scalarNode('default')->defaultNull()->end()->arrayNode('collectors')->isRequired()->useAttributeAsKey('name')->prototype('array')->children()->scalarNode('type')->isRequired()->end()->scalarNode('connection')->defaultNull()->end()->scalarNode('file')->defaultNull()->end()->scalarNode('host')->defaultNull()->end()->scalarNode('password')->defaultNull()->end()->integerNode('port')->defaultNull()->end()->scalarNode('prefix')->defaultNull()->end()->scalarNode('protocol')->defaultNull()->end()->scalarNode('source')->defaultNull()->end()->scalarNode('username')->defaultNull()->end()->scalarNode('influxdb_client')->defaultNull()->end()->scalarNode('prometheus_collector_registry')->defaultNull()->info('It must to contain service id for Prometheus\\CollectorRegistry class instance.')->end()->scalarNode('namespace')->defaultValue('')->end()->arrayNode('tags')->defaultValue(array())->prototype('scalar')->end()->end()->end()->validate()->ifTrue(function ($v) {
return 'librato' === $v['type'] && empty($v['source']);
})->thenInvalid('The source has to be specified to use a Librato')->end()->validate()->ifTrue(function ($v) {
return 'librato' === $v['type'] && empty($v['username']);
})->thenInvalid('The username has to be specified to use a Librato')->end()->validate()->ifTrue(function ($v) {
return 'librato' === $v['type'] && empty($v['password']);
})->thenInvalid('The password has to be specified to use a Librato')->end()->validate()->ifTrue(function ($v) {
return 'prometheus' === $v['type'] && empty($v['prometheus_collector_registry']);
})->thenInvalid('The prometheus_collector_registry has to be specified to use a Prometheus')->end()->end()->end()->end();
return $treeBuilder;
}