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Respect Datadog DD_TRACE_SAMPLE_RATE rate limiting environment variable #19

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Respect Datadog DD_TRACE_SAMPLE_RATE rate limiting environment variable #19

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ec56114
Respect Datadog DD_TRACE_SAMPLE_RATE rate limiting environment variable
radostyle Nov 29, 2023
ae641fa
Set default to 1.0
radostyle Nov 29, 2023
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18 changes: 18 additions & 0 deletions src/Profiler/DatadogProfiler.php
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Original file line number Diff line number Diff line change
Expand Up @@ -22,9 +22,17 @@ class DatadogProfiler implements ProfilerInterface

private LoggerInterface $logger;

private float $sampleRate = 1.0;

public function __construct(LoggerInterface $logger)
{
$this->logger = $logger;

$sampleRateString = getenv('DD_TRACE_SAMPLE_RATE');
if(is_numeric($sampleRateString)) {
$sampleRate = floatval($sampleRateString);
$this->sampleRate = $sampleRate;
}
}

public function start(string $name, ?string $kind = null): void
Expand All @@ -33,6 +41,10 @@ public function start(string $name, ?string $kind = null): void
return;
}

if($this->rateLimited()) {
return;
}

if (dd_trace_env_config('DD_TRACE_GENERATE_ROOT_SPAN')) {
$this->logger->error(
sprintf('You should set DD_TRACE_GENERATE_ROOT_SPAN=0 when using %s.', self::class)
Expand Down Expand Up @@ -89,6 +101,12 @@ public function stopAndIgnore(): void
GlobalTracer::set(new Tracer());
}

private function rateLimited(): bool
{
$randomFloat = mt_rand() / mt_getrandmax(); // between 0 and 1
return $randomFloat > $this->sampleRate;
}

private function isEnabled(): bool
{
return \extension_loaded('ddtrace')
Expand Down
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