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<?php |
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namespace Vend\Statsd; |
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use Psr\Log\LoggerAwareTrait; |
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use Psr\Log\NullLogger; |
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class Factory implements FactoryInterface |
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{ |
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use LoggerAwareTrait; |
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/** |
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* Factory constructor |
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*/ |
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public function __construct() |
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{ |
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$this->logger = new NullLogger(); |
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} |
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/** |
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* @param string $key |
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* @param mixed $value |
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* @param string $type |
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* @return Metric|null |
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*/ |
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protected function createMetric($key, $value, $type) |
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{ |
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if (!$this->validate($key, $value, $type)) { |
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return null; |
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} |
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return new Metric($key, $value, $type); |
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} |
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public function counter($key, $delta = 1) |
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{ |
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return $this->createMetric($key, $delta, Type::COUNTER); |
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} |
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public function increment($key) |
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{ |
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return $this->counter($key, 1); |
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} |
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public function decrement($key) |
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{ |
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return $this->counter($key, -1); |
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} |
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public function gauge($key, $value) |
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{ |
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return $this->createMetric($key, $value, Type::GAUGE); |
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} |
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public function timer($key, $time) |
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{ |
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return $this->createMetric($key, $time, Type::TIMER); |
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} |
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public function set($key, $value) |
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{ |
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return $this->createMetric($key, $value, Type::SET); |
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} |
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/** |
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* Validates the value against the type |
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* |
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* Most metrics require a numeric value. If the value is empty, this can cause receivers to think the format of |
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* the emitted datagrams is invalid. (And, heck, it might be: it's not like etsy/statsd is a formal standard.) |
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* |
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* We treat these errors silently: we log a message and return null from createMetric(), excluding the metric from |
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* being sent via the client. |
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* |
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* @param string $key |
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* @param mixed $value |
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* @param string $type |
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* @return bool |
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*/ |
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protected function validate($key, $value, $type) |
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{ |
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if (in_array($type, $this->getNumericMetricTypes(), true) && !is_numeric($value) && !preg_match('/^(-|\+)?\d+/', $value)) { |
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$this->logger->error('Could not emit metric: requires an numeric value', [ |
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'key' => $key, |
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'value' => $value, |
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'type' => $type, |
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]); |
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return false; |
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} |
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return true; |
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} |
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protected function getNumericMetricTypes() |
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{ |
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return [Type::COUNTER, Type::GAUGE, Type::TIMER]; |
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} |
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} |
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vend /
statsd
