FOUR-20535 Initial Setup (Laravel + Prometheus Integration)

ProcessMaker/Facades/Metrics.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace ProcessMaker\Facades;
+
+use Illuminate\Support\Facades\Facade;
+use ProcessMaker\Services\MetricsService;
+
+class Metrics extends Facade
+{
+    /**
+     * Get the registered name of the component.
+     *
+     * @return string
+     */
+    protected static function getFacadeAccessor()
+    {
+        return MetricsService::class;
+    }
+}

ProcessMaker/Http/Controllers/Designer/DesignerController.php

@@ -6,6 +6,7 @@
 use Illuminate\Http\Request;
 use Illuminate\Support\Composer;
 use Illuminate\Support\Facades\Auth;
+use ProcessMaker\Facades\Metrics;
 use ProcessMaker\Http\Controllers\Controller;
 use ProcessMaker\Traits\HasControllerAddons;
 
@@ -20,6 +21,11 @@ class DesignerController extends Controller
      */
     public function index(Request $request)
     {
+        // Register a counter for the total number of requests
+        Metrics::registerCounter('requests_total', 'Total requests made', ['method']);
+        // Increment the counter for the current request
+        Metrics::incrementCounter('requests_total', ['GET']);
+
         $hasPackage = false;
         if (class_exists(\ProcessMaker\Package\Projects\Models\Project::class)) {
             $hasPackage = true;

ProcessMaker/Providers/MetricsServiceProvider.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace ProcessMaker\Providers;
+
+use ProcessMaker\Services\MetricsService;
+use Illuminate\Support\ServiceProvider;
+
+class MetricsServiceProvider extends ServiceProvider
+{
+    /**
+     * Register services.
+     */
+    public function register(): void
+    {
+        $this->app->singleton(MetricsService::class, function ($app) {
+            return new MetricsService();
+        });
+    }
+
+    /**
+     * Bootstrap services.
+     */
+    public function boot(): void
+    {
+        //
+    }
+}

ProcessMaker/Services/MetricsService.php

@@ -0,0 +1,110 @@
+<?php
+
+namespace ProcessMaker\Services;
+
+use Prometheus\CollectorRegistry;
+use Prometheus\RenderTextFormat;
+use Prometheus\Storage\Redis;
+
+class MetricsService
+{
+    private $registry;
+
+    /**
+     * Initializes the MetricsService with a CollectorRegistry using the provided storage adapter.
+     *
+     * @param mixed $adapter The storage adapter to use (e.g., Redis).
+     */
+    public function __construct($adapter = null)
+    {
+        // Set up Redis as the adapter if none is provided
+        if ($adapter === null) {
+            $adapter = new Redis([
+                'host' => env('REDIS_HOST', '127.0.0.1'), 
+                'port' => env('REDIS_PORT', '6379')
+            ]);
+        }
+        $this->registry = new CollectorRegistry($adapter);
+    }
+
+    /**
+     * Returns the CollectorRegistry used by the MetricsService.
+     *
+     * @return \Prometheus\CollectorRegistry The CollectorRegistry used by the MetricsService.
+     */
+    public function getMetrics()
+    {
+        return $this->registry;
+    }
+
+    /**
+     * Retrieves a metric by its name.
+     *
+     * This method iterates through all registered metrics and returns the first metric that matches the given name.
+     * If no metric with the specified name is found, it returns null.
+     *
+     * @param string $name The name of the metric to retrieve.
+     * @return \Prometheus\MetricFamilySamples|null The metric with the specified name, or null if not found.
+     */
+    public function getMetricByName(string $name)
+    {
+        $metrics = $this->registry->getMetricFamilySamples();
+        foreach ($metrics as $metric) {
+            if ($metric->getName() === $name) {
+                return $metric;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Registers a new counter metric.
+     *
+     * @param string $name The name of the counter.
+     * @param string $help The help text of the counter.
+     * @param array $labels The labels of the counter.
+     * @return \Prometheus\Counter The registered counter.
+     */
+    public function registerCounter(string $name, string $help, array $labels = [])
+    {
+        return $this->registry->registerCounter('app', $name, $help, $labels);
+    }
+
+    /**
+     * Registers a new histogram metric.
+     *
+     * @param string $name The name of the histogram.
+     * @param string $help The help text of the histogram.
+     * @param array $labels The labels of the histogram.
+     * @param array $buckets The buckets of the histogram.
+     * @return \Prometheus\Histogram The registered histogram.
+     */
+    public function registerHistogram(string $name, string $help, array $labels = [], array $buckets = [])
+    {
+        return $this->registry->registerHistogram('app', $name, $help, $labels, $buckets);
+    }
+
+    /**
+     * Increments a counter metric by 1.
+     *
+     * @param string $name The name of the counter.
+     * @param array $labelValues The values of the labels for the counter.
+     */
+    public function incrementCounter(string $name, array $labelValues = [])
+    {
+        $counter = $this->registry->getCounter('app', $name);
+        $counter->inc($labelValues);
+    }
+
+    /**
+     * Renders the metrics in the Prometheus text format.
+     *
+     * @return string The rendered metrics.
+     */
+    public function renderMetrics()
+    {
+        $renderer = new RenderTextFormat();
+        $metrics = $this->registry->getMetricFamilySamples();
+        return $renderer->render($metrics);
+    }
+}