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Jaeger Bindings for PHP OpenTracing API
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README.md

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Jaeger Bindings for PHP OpenTracing API

This is a client-side library that can be used to instrument PHP apps for distributed trace collection, and to send those traces to Jaeger. See the OpenTracing PHP API for additional detail.

Contributing and Developing

Please see CONTRIBUTING.md.

Installation

Jaeger client can be installed via Composer:

composer require jonahgeorge/jaeger-client-php

Getting Started

<?php

require_once 'vendor/autoload.php';

use Jaeger\Config;
use OpenTracing\GlobalTracer;

$config = new Config(
    [
        'sampler' => [
            'type' => Jaeger\SAMPLER_TYPE_CONST,
            'param' => true,
        ],
        'logging' => true,
    ],
    'your-app-name'
);
$config->initializeTracer();

$tracer = GlobalTracer::get();

$scope = $tracer->startActiveSpan('TestSpan', []);
$scope->close();

$tracer->flush();

Samplers

List of supported samplers, for more info about samplers, please read Jaeger Sampling guide.

Const sampler

This sampler either samples everything, or nothing.

Configuration
'sampler' => [
    'type' => Jaeger\SAMPLER_TYPE_CONST,
    'param' => true, // boolean wheter to trace or not
],

Probabilistic sampler

This sampler samples request by given rate.

Configuration
'sampler' => [
    'type' => Jaeger\SAMPLER_TYPE_PROBABILISTIC,
    'param' => 0.5, // float [0.0, 1.0]
],

Rate limiting sampler

Samples maximum specified number of traces (requests) per second.

Requirements
  • psr/cache PSR-6 cache component to store and retrieve sampler state between requests. Cache component is passed to Jaeger\Config trough its constructor.
  • hrtime() function, that can retrieve time in nanoseconds. You need either php 7.3 or PECL/hrtime extension.
Configuration
'sampler' => [
    'type' => Jaeger\SAMPLER_TYPE_RATE_LIMITING,
    'param' => 100 // integer maximum number of traces per second,
    'cache' => [
        'currentBalanceKey' => 'rate.currentBalance' // string
        'lastTickKey' => 'rate.lastTick' // string
    ]
],

Testing

Tests are located in the tests directory. See tests/README.md.

Roadmap

License

MIT License.

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