/**
* Process the metric.
*
* @param Metric $metric
* @return bool|string
*/
protected function process(Metric &$metric)
{
// By the InfluxDb rules we have to have at least one value
$value = $metric->getValue();
if (empty($value)) {
return false;
}
// Sampling
if ($metric instanceof SamplingMetricInterface && $metric->getSampleRate() < 1) {
foreach ($value as $k => $v) {
if (!is_string($v)) {
$value[$k] = $v * $metric->getSampleRate();
}
}
}
// Metric name
$name = $this->quoteKey($metric->getName());
// Metric tags
if ($metric->hasTags()) {
$name .= ',' . $this->prepareTags($metric->getTags());
}
// Metric values
$name .= ' ' . $this->prepareValues($value);
// Metric time (from milliseconds to nanoseconds)
if ($metric->getTime()) {
$name .= ' ' . $metric->getTime() * 1000000;
}
return $name;
}
/**
* Test create function
*
* @dataProvider createProvider
* @param Metric $metric
* @param array $expected
*/
public function testCreate(Metric $metric, array $expected)
{
list($name, $value, $tags, $time) = $expected;
$this->assertEquals($name, $metric->getName());
$this->assertEquals($value, $metric->getValue());
$this->assertEquals($tags, $metric->getTags());
$this->assertEquals($time, $metric->getTime());
}
/**
* Formats metric to stats daemon format
* @see https://github.com/etsy/statsd/blob/master/docs/metric_types.md
*
* @param Metric $metric
* @param string $daemonType
* @return bool|string
*/
protected function process(Metric &$metric, $daemonType)
{
// If no value, nothing to add
$value = $metric->getValue();
if (!isset($value['value'])) {
return false;
}
$value = $value['value'];
$name = $metric->getName();
// Add tags to the beginning of the name
if ($metric->hasTags()) {
$name = Helper::mapAsString($metric->getTags()) . '.' . $name;
}
// Name with value and type
$result = $name . ':' . $value . '|' . $daemonType;
// Add sampling rate
if ($metric instanceof SamplingMetricInterface) {
if ($metric->getSampleRate() < 1.0) {
$result .= '|@' . $metric->getSampleRate();
}
}
return $result;
}
