feat: allows the user to pass a custom zipkin URL.

Author: jcchavezs

README.md

@@ -49,3 +49,19 @@ curl http://localhost:8081
 1. This starts a trace in the frontend (http://localhost:8081/)
 2. Continues the trace and calls the backend (http://localhost:9000)
 3. Next, you can view traces that went through the backend via http://localhost:9411/?serviceName=frontend.
+
+
+## Running example with a non-docker zipkin:
+
+If you need to pass the zipkin endpoint, just pass the reporter
+url as `HTTP_REPORTER_URL` env variable.
+
+```bash
+
+# In terminal 1:
+HTTP_REPORTER_URL=http://myzipkin:9411/api/v2/span composer run-frontend
+
+# In terminal 2
+HTTP_REPORTER_URL=http://myzipkin:9411/api/v2/span composer run-backend
+
+```

backend.php

@@ -1,6 +1,5 @@
 <?php
 
-use Zipkin\Timestamp;
 use Zipkin\Propagation\Map;
 
 require_once __DIR__ . '/vendor/autoload.php';

functions.php

@@ -1,12 +1,16 @@
 <?php
 
-use GuzzleHttp\Client;
 use Zipkin\Endpoint;
 use Zipkin\Samplers\BinarySampler;
 use Zipkin\TracingBuilder;
 
 function create_tracing($endpointName, $ipv4)
 {
+    $httpReporterURL = getenv('HTTP_REPORTER_URL');
+    if ($httpReporterURL === false) {
+        $httpReporterURL = 'http://localhost:9411/api/v2/spans';
+    }
+
     $endpoint = Endpoint::create($endpointName, $ipv4, null, 2555);
 
     /* Do not copy this logger into production.
@@ -15,7 +19,10 @@ function create_tracing($endpointName, $ipv4)
     $logger = new \Monolog\Logger('log');
     $logger->pushHandler(new \Monolog\Handler\ErrorLogHandler());
 
-    $reporter = new Zipkin\Reporters\Http(\Zipkin\Reporters\Http\CurlFactory::create());
+    $reporter = new Zipkin\Reporters\Http(
+        \Zipkin\Reporters\Http\CurlFactory::create(),
+        ['endpoint_url' => $httpReporterURL]
+    );
     $sampler = BinarySampler::createAsAlwaysSample();
     $tracing = TracingBuilder::create()
         ->havingLocalEndpoint($endpoint)