added more events, added apm changes

Author: n0nag0n

flight/Engine.php

@@ -30,6 +30,9 @@
  * @method void stop() Stops framework and outputs current response
  * @method void halt(int $code = 200, string $message = '', bool $actuallyExit = true) Stops processing and returns a given response.
  *
+ * # Class registration
+ * @method EventDispatcher eventDispatcher() Gets event dispatcher
+ *
  * # Routing
  * @method Route route(string $pattern, callable|string $callback, bool $pass_route = false, string $alias = '')
  * Routes a URL to a callback function with all applicable methods
@@ -110,7 +113,6 @@ public function __construct()
     {
         $this->loader = new Loader();
         $this->dispatcher = new Dispatcher();
-        $this->eventDispatcher = new EventDispatcher();
         $this->init();
     }
 
@@ -160,6 +162,9 @@ public function init(): void
         $this->dispatcher->setEngine($this);
 
         // Register default components
+        $this->map('eventDispatcher', function () {
+            return EventDispatcher::getInstance();
+        });
         $this->loader->register('request', Request::class);
         $this->loader->register('response', Response::class);
         $this->loader->register('router', Router::class);
@@ -460,7 +465,9 @@ protected function processMiddleware(Route $route, string $eventName): bool
             // Here is the array callable $middlewareObject that we created earlier.
             // It looks bizarre but it's really calling [ $class, $method ]($params)
             // Which loosely translates to $class->$method($params)
+            $start = microtime(true);
             $middlewareResult = $middlewareObject($params);
+            $this->triggerEvent('flight.middleware.executed', $route, $middleware, microtime(true) - $start);
 
             if ($useV3OutputBuffering === true) {
                 $this->response()->write(ob_get_clean());
@@ -573,12 +580,12 @@ public function _start(): void
             }
 
             // Call route handler
+            $routeStart = microtime(true);
             $continue = $this->dispatcher->execute(
                 $route->callback,
                 $params
             );
-            $this->triggerEvent('flight.route.executed', $route);
-
+            $this->triggerEvent('flight.route.executed', $route, microtime(true) - $routeStart);
             if ($useV3OutputBuffering === true) {
                 $response->write(ob_get_clean());
             }
@@ -631,6 +638,7 @@ public function _start(): void
      */
     public function _error(Throwable $e): void
     {
+        $this->triggerEvent('flight.error', $e);
         $msg = sprintf(
             <<<'HTML'
             <h1>500 Internal Server Error</h1>
@@ -678,8 +686,6 @@ public function _stop(?int $code = null): void
             }
 
             $response->send();
-
-            $this->triggerEvent('flight.response.sent', $response);
         }
     }
 
@@ -831,6 +837,8 @@ public function _redirect(string $url, int $code = 303): void
             $url = $base . preg_replace('#/+#', '/', '/' . $url);
         }
 
+        $this->triggerEvent('flight.redirect', $url, $code);
+
         $this->response()
             ->clearBody()
             ->status($code)
@@ -854,7 +862,9 @@ public function _render(string $file, ?array $data = null, ?string $key = null):
             return;
         }
 
+        $start = microtime(true);
         $this->view()->render($file, $data);
+        $this->triggerEvent('flight.view.rendered', $file, microtime(true) - $start);
     }
 
     /**
@@ -1019,7 +1029,7 @@ public function _getUrl(string $alias, array $params = []): string
      */
     public function _onEvent(string $eventName, callable $callback): void
     {
-        $this->eventDispatcher->on($eventName, $callback);
+        $this->eventDispatcher()->on($eventName, $callback);
     }
 
     /**
@@ -1030,6 +1040,6 @@ public function _onEvent(string $eventName, callable $callback): void
      */
     public function _triggerEvent(string $eventName, ...$args): void
     {
-        $this->eventDispatcher->trigger($eventName, ...$args);
+        $this->eventDispatcher()->trigger($eventName, ...$args);
     }
 }

flight/Flight.php

@@ -8,6 +8,7 @@
 use flight\net\Router;
 use flight\template\View;
 use flight\net\Route;
+use flight\core\EventDispatcher;
 
 require_once __DIR__ . '/autoload.php';
 
@@ -29,6 +30,9 @@
  * Unregisters a class to a framework method.
  * @method static void registerContainerHandler(callable|object $containerHandler) Registers a container handler.
  *
+ * # Class registration
+ * @method EventDispatcher eventDispatcher() Gets event dispatcher
+ *
  * # Routing
  * @method static Route route(string $pattern, callable|string $callback, bool $pass_route = false, string $alias = '')
  * Maps a URL pattern to a callback with all applicable methods.

flight/core/EventDispatcher.php

@@ -6,9 +6,25 @@
 
 class EventDispatcher
 {
+    /** @var self|null Singleton instance of the EventDispatcher */
+    private static ?self $instance = null;
+
     /** @var array<string, array<int, callable>> */
     protected array $listeners = [];
 
+    /**
+     * Singleton instance of the EventDispatcher.
+     *
+     * @return self
+     */
+    public static function getInstance(): self
+    {
+        if (self::$instance === null) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+
     /**
      * Register a callback for an event.
      *
@@ -42,4 +58,80 @@ public function trigger(string $event, ...$args): void
             }
         }
     }
+
+    /**
+     * Check if an event has any registered listeners.
+     *
+     * @param string $event Event name
+     *
+     * @return bool True if the event has listeners, false otherwise
+     */
+    public function hasListeners(string $event): bool
+    {
+        return isset($this->listeners[$event]) === true && count($this->listeners[$event]) > 0;
+    }
+
+    /**
+     * Get all listeners registered for a specific event.
+     *
+     * @param string $event Event name
+     *
+     * @return array<int, callable> Array of callbacks registered for the event
+     */
+    public function getListeners(string $event): array
+    {
+        return $this->listeners[$event] ?? [];
+    }
+
+    /**
+     * Get a list of all events that have registered listeners.
+     *
+     * @return array<int, string> Array of event names
+     */
+    public function getAllRegisteredEvents(): array
+    {
+        return array_keys($this->listeners);
+    }
+
+    /**
+     * Remove a specific listener for an event.
+     *
+     * @param string   $event    the event name
+     * @param callable $callback the exact callback to remove
+     *
+     * @return void
+     */
+    public function removeListener(string $event, callable $callback): void
+    {
+        if (isset($this->listeners[$event]) === true && count($this->listeners[$event]) > 0) {
+            $this->listeners[$event] = array_filter($this->listeners[$event], function ($listener) use ($callback) {
+                return $listener !== $callback;
+            });
+            $this->listeners[$event] = array_values($this->listeners[$event]); // Re-index the array
+        }
+    }
+
+    /**
+     * Remove all listeners for a specific event.
+     *
+     * @param string $event the event name
+     *
+     * @return void
+     */
+    public function removeAllListeners(string $event): void
+    {
+        if (isset($this->listeners[$event]) === true) {
+            unset($this->listeners[$event]);
+        }
+    }
+
+    /**
+     * Remove the current singleton instance of the EventDispatcher.
+     *
+     * @return void
+     */
+    public static function resetInstance(): void
+    {
+        self::$instance = null;
+    }
 }

flight/database/PdoWrapper.php

@@ -4,12 +4,40 @@
 
 namespace flight\database;
 
+use flight\core\EventDispatcher;
 use flight\util\Collection;
 use PDO;
 use PDOStatement;
 
 class PdoWrapper extends PDO
 {
+    /** @var bool $trackApmQueries Whether to track application performance metrics (APM) for queries. */
+    protected bool $trackApmQueries = false;
+
+    /** @var array<int,array<string,mixed>> $queryMetrics Metrics related to the database connection. */
+    protected array $queryMetrics = [];
+
+    /** @var array<string,string> $connectionMetrics Metrics related to the database connection. */
+    protected array $connectionMetrics = [];
+
+    /**
+     * Constructor for the PdoWrapper class.
+     *
+     * @param string $dsn The Data Source Name (DSN) for the database connection.
+     * @param string|null $username The username for the database connection.
+     * @param string|null $password The password for the database connection.
+     * @param array<string, mixed>|null $options An array of options for the PDO connection.
+     * @param bool $trackApmQueries Whether to track application performance metrics (APM) for queries.
+     */
+    public function __construct(?string $dsn = null, ?string $username = '', ?string $password = '', ?array $options = null, bool $trackApmQueries = false)
+    {
+        parent::__construct($dsn, $username, $password, $options);
+        $this->trackApmQueries = $trackApmQueries;
+        if ($this->trackApmQueries === true) {
+            $this->connectionMetrics = $this->pullDataFromDsn($dsn);
+        }
+    }
+
     /**
      * Use this for INSERTS, UPDATES, or if you plan on using a SELECT in a while loop
      *
@@ -31,8 +59,19 @@ public function runQuery(string $sql, array $params = []): PDOStatement
         $processed_sql_data = $this->processInStatementSql($sql, $params);
         $sql = $processed_sql_data['sql'];
         $params = $processed_sql_data['params'];
+        $start = $this->trackApmQueries === true ? microtime(true) : 0;
+        $memory_start = $this->trackApmQueries === true ? memory_get_usage() : 0;
         $statement = $this->prepare($sql);
         $statement->execute($params);
+        if ($this->trackApmQueries === true) {
+            $this->queryMetrics[] = [
+                'sql' => $sql,
+                'params' => $params,
+                'execution_time' => microtime(true) - $start,
+                'row_count' => $statement->rowCount(),
+                'memory_usage' => memory_get_usage() - $memory_start
+            ];
+        }
         return $statement;
     }
 
@@ -88,9 +127,20 @@ public function fetchAll(string $sql, array $params = [])
         $processed_sql_data = $this->processInStatementSql($sql, $params);
         $sql = $processed_sql_data['sql'];
         $params = $processed_sql_data['params'];
+        $start = $this->trackApmQueries === true ? microtime(true) : 0;
+        $memory_start = $this->trackApmQueries === true ? memory_get_usage() : 0;
         $statement = $this->prepare($sql);
         $statement->execute($params);
         $results = $statement->fetchAll();
+        if ($this->trackApmQueries === true) {
+            $this->queryMetrics[] = [
+                'sql' => $sql,
+                'params' => $params,
+                'execution_time' => microtime(true) - $start,
+                'row_count' => $statement->rowCount(),
+                'memory_usage' => memory_get_usage() - $memory_start
+            ];
+        }
         if (is_array($results) === true && count($results) > 0) {
             foreach ($results as &$result) {
                 $result = new Collection($result);
@@ -101,6 +151,56 @@ public function fetchAll(string $sql, array $params = [])
         return $results;
     }
 
+    /**
+     * Pulls the engine, database, and host from the DSN string.
+     *
+     * @param string $dsn The Data Source Name (DSN) string.
+     *
+     * @return array<string,string> An associative array containing the engine, database, and host.
+     */
+    protected function pullDataFromDsn(string $dsn): array
+    {
+        // pull the engine from the dsn (sqlite, mysql, pgsql, etc)
+        preg_match('/^([a-zA-Z]+):/', $dsn, $matches);
+        $engine = $matches[1] ?? 'unknown';
+
+        if ($engine === 'sqlite') {
+            // pull the path from the dsn
+            preg_match('/sqlite:(.*)/', $dsn, $matches);
+            $dbname = basename($matches[1] ?? 'unknown');
+            $host = 'localhost';
+        } else {
+            // pull the database from the dsn
+            preg_match('/dbname=([^;]+)/', $dsn, $matches);
+            $dbname = $matches[1] ?? 'unknown';
+            // pull the host from the dsn
+            preg_match('/host=([^;]+)/', $dsn, $matches);
+            $host = $matches[1] ?? 'unknown';
+        }
+
+        return [
+            'engine' => $engine,
+            'database' => $dbname,
+            'host' => $host
+        ];
+    }
+
+    /**
+     * Logs the executed queries through the event dispatcher.
+     *
+     * This method enables logging of all the queries executed by the PDO wrapper.
+     * It can be useful for debugging and monitoring purposes.
+     *
+     * @return void
+     */
+    public function logQueries(): void
+    {
+        if ($this->trackApmQueries === true && $this->connectionMetrics !== [] && $this->queryMetrics !== []) {
+            EventDispatcher::getInstance()->trigger('flight.db.queries', $this->connectionMetrics, $this->queryMetrics);
+            $this->queryMetrics = []; // Reset after logging
+        }
+    }
+
     /**
      * Don't worry about this guy. Converts stuff for IN statements
      *

flight/net/Response.php

@@ -5,6 +5,7 @@
 namespace flight\net;
 
 use Exception;
+use flight\core\EventDispatcher;
 
 /**
  * The Response class represents an HTTP response. The object
@@ -426,6 +427,7 @@ public function send(): void
             }
         }
 
+        $start = microtime(true);
         // Only for the v3 output buffering.
         if ($this->v2_output_buffering === false) {
             $this->processResponseCallbacks();
@@ -436,8 +438,9 @@ public function send(): void
         }
 
         echo $this->body;
-
         $this->sent = true;
+
+        EventDispatcher::getInstance()->trigger('flight.response.sent', $this, microtime(true) - $start);
     }
 
     /**