Add some prometheus stats

src/GarbageCollector.php

@@ -63,9 +63,11 @@ final class GarbageCollector
         }
         self::$started = true;
 
-        EventLoop::unreference(EventLoop::repeat(1, static function (): void {
+        $counter = Magic::getCounter("", "explicit_gc_count", "Number of times the GC was explicitly invoked", []);
+        EventLoop::unreference(EventLoop::repeat(1, static function () use ($counter): void {
             $currentMemory = self::getMemoryConsumption();
             if ($currentMemory > self::$memoryConsumption + self::$memoryDiffMb) {
+                $counter();
                 gc_collect_cycles();
                 self::$memoryConsumption = self::getMemoryConsumption();
                 /*self::$memoryConsumption = self::getMemoryConsumption();

src/InternalDoc.php

@@ -994,6 +994,46 @@ abstract class InternalDoc
     {
         return $this->wrapper->getAPI()->getPlugin($class);
     }
+    /**
+     * Returns a closure linked to the specified prometheus counter.
+     *
+     * @return Closure(): void Call to increment the counter
+     */
+    final public function getPromCounter(string $namespace, string $name, string $help, array $labels = [
+    ]): \Closure
+    {
+        return $this->wrapper->getAPI()->getPromCounter($namespace, $name, $help, $labels);
+    }
+    /**
+     * Returns a closure linked to the specified prometheus gauge.
+     *
+     * @return Closure(float): void
+     */
+    final public function getPromGauge(string $namespace, string $name, string $help, array $labels = [
+    ]): \Closure
+    {
+        return $this->wrapper->getAPI()->getPromGauge($namespace, $name, $help, $labels);
+    }
+    /**
+     * Returns a closure linked to the specified prometheus histogram.
+     *
+     * @return Closure(float): void
+     */
+    final public function getPromHistogram(string $namespace, string $name, string $help, $labels = [
+    ], ?array $buckets = null): \Closure
+    {
+        return $this->wrapper->getAPI()->getPromHistogram($namespace, $name, $help, $labels, $buckets);
+    }
+    /**
+     * Returns a closure linked to the specified prometheus summary.
+     *
+     * @return Closure(float): void
+     */
+    final public function getPromSummary(string $namespace, string $name, string $help, $labels = [
+    ], int $maxAgeSeconds = 600, ?array $quantiles = null): \Closure
+    {
+        return $this->wrapper->getAPI()->getPromSummary($namespace, $name, $help, $labels, $maxAgeSeconds, $quantiles);
+    }
     /**
      * Gets info of the propic of a user.
      */

src/Ipc/AbstractServer.php

@@ -25,12 +25,14 @@ use Amp\DeferredFuture;
 use Amp\Future;
 use Amp\Ipc\IpcServer;
 use Amp\Ipc\Sync\ChannelledSocket;
+use Closure;
 use danog\Loop\Loop;
 use danog\MadelineProto\Exception;
 use danog\MadelineProto\Ipc\Runner\ProcessRunner;
 use danog\MadelineProto\Ipc\Runner\WebRunner;
 use danog\MadelineProto\Logger;
 use danog\MadelineProto\Loop\InternalLoop;
+use danog\MadelineProto\MTProto;
 use danog\MadelineProto\SessionPaths;
 use danog\MadelineProto\Settings\Ipc;
 use danog\MadelineProto\Shutdown;
@@ -48,7 +50,18 @@ use function Amp\delay;
  */
 abstract class AbstractServer extends Loop
 {
-    use InternalLoop;
+    use InternalLoop {
+        __construct as private internalInit;
+    }
+    /**
+     * @var Closure(int): void
+     */
+    private Closure $connectionGauge;
+    public function __construct(MTProto $API)
+    {
+        $this->internalInit($API);
+        $this->connectionGauge = $API->getPromGauge("", "ipc_server_connections", "Number of IPC server connections");
+    }
     /**
      * Server version.
      */
@@ -204,6 +217,7 @@ abstract class AbstractServer extends Loop
     {
         $this->API->waitForInit();
         $this->API->logger('Accepted IPC client connection!');
+        ($this->connectionGauge)(1);
 
         $id = 0;
         $payload = null;
@@ -214,6 +228,7 @@ abstract class AbstractServer extends Loop
         } catch (Throwable $e) {
             Logger::log("Exception in IPC connection: $e");
         } finally {
+            ($this->connectionGauge)(-1);
             EventLoop::queue(function () use ($socket, $payload): void {
                 try {
                     $socket->disconnect();

src/Ipc/Server.php

@@ -20,13 +20,12 @@ declare(strict_types=1);
 
 namespace danog\MadelineProto\Ipc;
 
-use danog\MadelineProto\MTProto;
-
 /**
  * IPC server.
  *
  * @internal
  */
-final class Server extends AbstractServer {
+final class Server extends AbstractServer
+{
 
 }

src/Ipc/ServerCallback.php

@@ -31,7 +31,7 @@ use Revolt\EventLoop;
  *
  * @internal
  */
-final class ServerCallback extends Server
+final class ServerCallback extends AbstractServer
 {
     /**
      * Timeout watcher list, indexed by socket ID.

src/MTProto.php

@@ -32,6 +32,7 @@ use Amp\Http\Client\Request;
 use Amp\SignalException;
 use Amp\Sync\LocalKeyedMutex;
 use Amp\Sync\LocalMutex;
+use Closure;
 use danog\AsyncOrm\Annotations\OrmMappedArray;
 use danog\AsyncOrm\DbArray;
 use danog\AsyncOrm\DbArrayBuilder;
@@ -73,6 +74,10 @@ use danog\MadelineProto\Wrappers\Events;
 use danog\MadelineProto\Wrappers\Login;
 use danog\MadelineProto\Wrappers\Loop;
 use danog\MadelineProto\Wrappers\Start;
+use Prometheus\Counter;
+use Prometheus\Gauge;
+use Prometheus\Histogram;
+use Prometheus\Summary;
 use Psr\Log\LoggerInterface;
 use Revolt\EventLoop;
 use SplQueue;
@@ -506,6 +511,77 @@ final class MTProto implements TLCallback, LoggerGetter, SettingsGetter
         }
     }
 
+    /**
+     * Returns a closure linked to the specified prometheus gauge.
+     *
+     * @internal
+     * 
+     * @return Closure(int): void
+     */
+    public function getPromGauge(string $namespace, string $name, string $help, array $labels = []): Closure
+    {
+        return Magic::getGauge(
+            $namespace,
+            $name,
+            $help,
+            $labels + ['session' => $this->getSessionName(), 'session_id' => (string) ($this->getSelf()['id'] ?? '')],
+        );
+    }
+
+    /**
+     * Returns a closure linked to the specified prometheus counter.
+     *
+     * @internal
+     * 
+     * @return Closure(): void Call to increment the counter
+     */
+    public function getPromCounter(string $namespace, string $name, string $help, array $labels = []): Closure
+    {
+        return Magic::getCounter(
+            $namespace,
+            $name,
+            $help,
+            $labels + ['session' => $this->getSessionName(), 'session_id' => (string) ($this->getSelf()['id'] ?? '')],
+        );
+    }
+
+    /**
+     * Returns a closure linked to the specified prometheus summary.
+     *
+     * @internal
+     * 
+     * @return Closure(float): void
+     */
+    public function getPromSummary(string $namespace, string $name, string $help, $labels = [], int $maxAgeSeconds = 600, ?array $quantiles = null): Closure
+    {
+        return Magic::getSummary(
+            $namespace,
+            $name,
+            $help,
+            $labels + ['session' => $this->getSessionName(), 'session_id' => (string) ($this->getSelf()['id'] ?? '')],
+            $maxAgeSeconds,
+            $quantiles
+        );
+    }
+
+    /**
+     * Returns a closure linked to the specified prometheus histogram.
+     *
+     * @internal
+     * 
+     * @return Closure(float): void
+     */
+    public function getPromHistogram(string $namespace, string $name, string $help, $labels = [], ?array $buckets = null): Closure
+    {
+        return Magic::getHistogram(
+            $namespace,
+            $name,
+            $help,
+            $labels + ['session' => $this->getSessionName(), 'session_id' => (string) ($this->getSelf()['id'] ?? '')],
+            $buckets
+        );
+    }
+
     /**
      * Initialization function.
      *

src/Magic.php

@@ -22,6 +22,7 @@ namespace danog\MadelineProto;
 
 use Amp\DeferredFuture;
 use Amp\SignalException;
+use Closure;
 use danog\MadelineProto\TL\Conversion\Extension;
 use phpseclib3\Math\BigInteger;
 use Prometheus\CollectorRegistry;
@@ -206,7 +207,8 @@ final class Magic
      * Whether there's a basedir limitation.
      */
     public static bool $hasBasedirLimitation = false;
-    public static CollectorRegistry $prometheus;
+    private static CollectorRegistry $prometheus;
+    private static array $promLabels;
     /**
      * Encoded emojis.
      *
@@ -341,16 +343,72 @@ final class Magic
             }
         }
         self::$prometheus = new CollectorRegistry(new InMemory);
-        $alloc = self::$prometheus->registerGauge("", "php_memstats_alloc_bytes", "RAM allocated by the PHP memory pool", ["pid"]);
-        $inuse = self::$prometheus->registerGauge("", "php_memstats_inuse_bytes", "RAM actually used by PHP", ["pid"]);
-        $labels = self::$pid ? [(string) self::$pid] : [];
-        EventLoop::repeat(1.0, function () use ($alloc, $inuse, $labels): void {
-            $alloc->set((float) memory_get_usage(true), $labels);
-            $inuse->set((float) memory_get_usage(false), $labels);
-        });
+        self::$promLabels = ['release' => API::RELEASE];
+        if (self::$pid !== null) {
+            self::$promLabels['pid'] = (string) self::$pid;
+        }
+
+        $alloc = self::getGauge("", "php_memstats_alloc_bytes", "RAM allocated by the PHP memory pool", []);
+        $inuse = self::getGauge("", "php_memstats_inuse_bytes", "RAM actually used by PHP", []);
+        EventLoop::unreference(EventLoop::repeat(1.0, static function () use ($alloc, $inuse): void {
+            $alloc((float) memory_get_usage(true));
+            $inuse((float) memory_get_usage(false));
+        }));
         GarbageCollector::start();
         self::$inited = true;
     }
+    /**
+     * @param array<string, string> $labels
+     * @return Closure(int): void
+     */
+    public static function getGauge(string $namespace, string $name, string $help, array $labels): Closure
+    {
+        $labels += self::$promLabels;
+        $gauge = self::$prometheus->getOrRegisterGauge($namespace, $name, $help, array_keys($labels));
+        $labels = array_values($labels);
+        return static function (int $by) use ($labels, $gauge): void {
+            $gauge->incBy($by);
+        };
+    }
+    /**
+     * @param array<string, string> $labels
+     * @return Closure(): void
+     */
+    public static function getCounter(string $namespace, string $name, string $help, array $labels): Closure
+    {
+        $labels += self::$promLabels;
+        $gauge = self::$prometheus->getOrRegisterCounter($namespace, $name, $help, array_keys($labels));
+        $labels = array_values($labels);
+        return static function () use ($labels, $gauge): void {
+            $gauge->inc($labels);
+        };
+    }
+    /**
+     * @param array<string, string> $labels
+     * @return Closure(float): void
+     */
+    public static function getHistogram(string $namespace, string $name, string $help, array $labels, ?array $buckets = null): Closure
+    {
+        $labels += self::$promLabels;
+        $gauge = self::$prometheus->getOrRegisterHistogram($namespace, $name, $help, array_keys($labels), $buckets);
+        $labels = array_values($labels);
+        return static function ($value) use ($labels, $gauge): void {
+            $gauge->observe($value, $labels);
+        };
+    }
+    /**
+     * @param array<string, string> $labels
+     * @return Closure(float): void
+     */
+    public static function getSummary(string $namespace, string $name, string $help, array $labels, int $maxAgeSeconds = 600, ?array $quantiles = null): Closure
+    {
+        $labels += self::$promLabels;
+        $gauge = self::$prometheus->getOrRegisterSummary($namespace, $name, $help, array_keys($labels), $maxAgeSeconds, $quantiles);
+        $labels = array_values($labels);
+        return static function ($value) use ($labels, $gauge): void {
+            $gauge->observe($value, $labels);
+        };
+    }
     /**
      * Check if this is a POSIX fork of the main PHP process.
      */