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chore: uses HTTP instrumentation from Zipkin PHP. #18

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chore: uses HTTP instrumentation from Zipkin PHP. #18

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15 changes: 13 additions & 2 deletions backend.php
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
<?php

use Zipkin\Propagation\Map;
use Zipkin\Propagation\TraceContext;

require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/functions.php';
Expand All @@ -9,6 +10,8 @@

$request = \Symfony\Component\HttpFoundation\Request::createFromGlobals();

usleep(1000 * mt_rand(1, 3));

$carrier = array_map(function ($header) {
return $header[0];
}, $request->headers->all());
Expand All @@ -19,20 +22,28 @@

/* Get users from DB */
$tracer = $tracing->getTracer();
$span = $tracer->nextSpan($extractedContext);

$span = $extractedContext instanceof TraceContext
? $tracer->joinSpan($extractedContext)
: $tracer->nextSpan($extractedContext);

$span->start();
$span->setKind(Zipkin\Kind\SERVER);
$span->setName('parse_request');
usleep(1000 * mt_rand(1, 3));

$childSpan = $tracer->newChild($span->getContext());
$childSpan->start();
$childSpan->setKind(Zipkin\Kind\CLIENT);
$childSpan->setName('user:get_list:mysql_query');
$childSpan->tag("sql.query", "SELECT * FROM users LIMIT 10");

usleep(50000);
usleep(30000);

$childSpan->finish();

usleep(1000 * mt_rand(1, 3));

$span->finish();

/* Sends the trace to zipkin once the response is served */
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9 changes: 5 additions & 4 deletions composer.json
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Original file line number Diff line number Diff line change
Expand Up @@ -2,9 +2,10 @@
"name": "openzipkin/zipkin-php-example",
"require": {
"monolog/monolog": "^1.23",
"guzzlehttp/guzzle": "^6.3",
"openzipkin/zipkin": "^1.2.2",
"symfony/http-foundation": "3.4.x-dev"
"guzzlehttp/guzzle": "7.0.0-RC.1",
"openzipkin/zipkin": "dev-http_tracing",
"symfony/http-foundation": "3.4.x-dev",
"psr/http-client": "^1.0"
},
"minimum-stability": "stable",
"authors": [
Expand All @@ -18,4 +19,4 @@
"run-backend": "php -S 'localhost:9000' backend.php",
"run-zipkin": "docker run -p 9411:9411 -d openzipkin/zipkin"
}
}
}
30 changes: 11 additions & 19 deletions frontend.php
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,8 @@

use GuzzleHttp\Client;
use Zipkin\Propagation\DefaultSamplingFlags;
use Zipkin\Propagation\Map;
use Zipkin\Timestamp;
use Zipkin\Instrumentation\Http\Client\Client as ZipkinClient;

require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/functions.php';
Expand All @@ -21,30 +21,22 @@
$span->setName('parse_request');
$span->setKind(Zipkin\Kind\SERVER);

usleep(100 * mt_rand(1, 3));

/* Creates the span for getting the users list */
$childSpan = $tracer->newChild($span->getContext());
$childSpan->start();
$childSpan->setKind(Zipkin\Kind\CLIENT);
$childSpan->setName('users:get_list');
// We need to open a scope so the http client can retrieve the current
// context from it.
$scopeCloser = $tracer->openScope($span);

$headers = [];
usleep(100 * mt_rand(1, 3));

/* Injects the context into the wire */
$injector = $tracing->getPropagation()->getInjector(new Map());
$injector($childSpan->getContext(), $headers);
$httpClient = new ZipkinClient(new Client, $tracing);
$request = new \GuzzleHttp\Psr7\Request('POST', 'localhost:9000');
$response = $httpClient->sendRequest($request);

/* HTTP Request to the backend */
$httpClient = new Client();
$request = new \GuzzleHttp\Psr7\Request('POST', 'localhost:9000', $headers);
$childSpan->annotate('request_started', Timestamp\now());
$response = $httpClient->send($request);
$childSpan->annotate('request_finished', Timestamp\now());
echo $response->getBody();

$childSpan->finish();
usleep(100 * mt_rand(1, 3));

$span->finish();
$scopeCloser();

/* Sends the trace to zipkin once the response is served */

Expand Down