PHP code example of vantt / opentracing-php

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

vantt / opentracing-php example snippets

use OpenTracing\GlobalTracer;

$tracer = GlobalTracer::set(new MyTracerImplementation());

$span = $tracer->buildSpan('my_span')
               ->asChildOf($parentContext)
               ->withTag('foo', 'bar')               
               ->withStartTimestamp(time())
               ->start();

$scope = $tracer->buildSpan('my_span')
                ->asChildOf($parentContext)
                ->withTag('foo', 'bar')               
                ->withStartTimestamp(time())
                ->startActive();

use OpenTracing\Formats;
use OpenTracing\GlobalTracer;

...

// extract the span context
$spanContext = GlobalTracer::get()->extract(
    Formats\HTTP_HEADERS,
    getallheaders()
);

function doSomething() {
    ...

    // start a new span called 'my_span' and make it a child of the $spanContext
    $span = GlobalTracer::get()->buildSpan('my_operation_span_name')
                               ->start();
    ...
    
    // add some logs to the span
    $span->log([
        'event' => 'soft error',
        'type' => 'cache timeout',
        'waiter.millis' => 1500,
    ]);

    // finish the the span
    $span->finish();
}

$span = $tracer->buildSpan('my_first_span')->start();
...
$span->finish();

// At dispatcher level
$scope = $tracer->buildSpan('request')->start();
...
$scope->close();

// At controller level
$scope = $tracer->buildSpan('controller')->startActive();
...
$scope->close();

// At RPC calls level
$scope = $tracer->buildSpan('http')->startActive();
file_get_contents('http://php.net');
$scope->close();

$tracer = GlobalTracer::get();
$parent = $tracer->startSpan('parent');

$child = $tracer->buildSpan('child_operation')
                ->asChildOf($parent)
                ->start();
...

$child->finish();

...

$parent->finish();

$parent = GlobalTracer::get()->buildSpan('parent')->startActive();

...

/*
 * Since the parent span has been created by using startActiveSpan we don't need
 * to pass a reference for this child span
 */
$child = GlobalTracer::get()->buildSpan('my_second_span')->startActive();

...

$child->close();

...

$parent->close();

use GuzzleHttp\Client;
use OpenTracing\Formats;

...

$tracer = GlobalTracer::get();

$spanContext = $tracer->extract(
    Formats\HTTP_HEADERS,
    getallheaders()
);

try {
    $span = $tracer->buildSpan('my_span')->asChildOf($spanContext)->start();

    $client = new Client;

    $headers = [];

    $tracer->inject(
        $span->getContext(),
        Formats\HTTP_HEADERS,
        $headers
    );

    $request = new \GuzzleHttp\Psr7\Request('GET', 'http://myservice', $headers);
    $client->send($request);
    ...

} catch (\Exception $e) {
    ...
}
...

use OpenTracing\GlobalTracer;
use OpenTracing\Formats;

$tracer = GlobalTracer::get();
$spanContext = $tracer->extract(Formats\HTTP_HEADERS, getallheaders());
$tracer->buildSpan('my_span')->asChildOf($spanContext)->startActive();

use OpenTracing\GlobalTracer;

$application->run();

register_shutdown_function(function() {
    /* Flush the tracer to the backend */
    $tracer = GlobalTracer::get();
    $tracer->flush();
});

$span = $tracer->startActiveSpan('my_span', [
    'child_of' => $spanContext,
    'tags' => ['foo' => 'bar'],
    'start_time' => time(),
]);