PHP OpenTelemetry library

An alternative version of the library for the OpenTelemetry standard on PHP.

Why is this needed?

The original library for OpenTelemetry has a complex trace-building architecture, leading to an increase in supporting code. This library offers a simpler and flatter interface for generating telemetry.

Installation

Example

<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use IfCastle\OpenTelemetry\Tracer;

$tracer = new Tracer(...);

$span = $tracer->createSpan('example-span', SpanKindEnum::INTERNAL);

try {
    $span->addEvent('event-name', ['key' => 'value'])
         ->setStatus(StatusCodeEnum::OK);
} catch (Throwable $exception) {
    $span->registerException($exception);
    throw $e;
} finally {
    $span->end();
}

Simplified diagram

The simplified diagram shows the structure used for creating traces:

• TracerInterface is responsible for aggregating telemetry in the application. It is a factory class that creates a Trace.

• TraceInterface and SpanInterface represent the Trace and Span structures, according to the OpenTelemetry definitions. They allow manipulating the data within the entities in a convenient way.

• To record telemetry, you can use only the TracerInterface, or combine it with the SpanInterface.

@startuml class-diagram

  interface "TracerInterface" as TracerInterface {
    +newTelemetryContext()
    +createTrace()
    +endTrace(trace)
    +createSpan(spanName, spanKind, instrumentationScope, attributes)
    +endSpan(span)
    +registerLog(instrumentationScope, level, body, attributes)
    +registerException(throwable, attributes)
  }

  interface "SpanInterface" as SpanInterface {
    +addEvent(name, attributes, timestamp)
    +recordException(exception, attributes)
    +end(endEpochNanos)
    +addLink(link)
  }

  interface "TraceInterface" as TraceInterface {
    +newSpanId()
    +getTraceId()
    +getCurrentSpanId()
    +getCurrentSpan()
    +createSpan(spanName, spanKind, instrumentationScope, attributes)
    +endSpan(span)
    +end()
  }

  TraceInterface ..> SpanInterface
  TracerInterface ..> SpanInterface
  TracerInterface ..> TraceInterface

@enduml