Refactor logging into new LogStreamHandler

src/AccessLogHandler.php

@@ -2,7 +2,7 @@
 
 namespace FrameworkX;
 
-use FrameworkX\Io\SapiHandler;
+use FrameworkX\Io\LogStreamHandler;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use React\Http\Message\Response;
@@ -14,15 +14,17 @@
  */
 class AccessLogHandler
 {
-    /** @var SapiHandler */
-    private $sapi;
+    /** @var LogStreamHandler */
+    private $logger;
 
     /** @var bool */
     private $hasHighResolution;
 
+    /** @throws void */
     public function __construct()
     {
-        $this->sapi = new SapiHandler();
+        /** @throws void because `fopen()` is known to always return a `resource` for built-in wrappers */
+        $this->logger = new LogStreamHandler(\PHP_SAPI === 'cli' ? 'php://output' : 'php://stderr');
         $this->hasHighResolution = \function_exists('hrtime'); // PHP 7.3+
     }
 
@@ -85,7 +87,7 @@ private function log(ServerRequestInterface $request, ResponseInterface $respons
             $responseSize = 0;
         }
 
-        $this->sapi->log(
+        $this->logger->log(
             ($request->getAttribute('remote_addr') ?? $request->getServerParams()['REMOTE_ADDR'] ?? '-') . ' ' .
             '"' . $this->escape($method) . ' ' . $this->escape($request->getRequestTarget()) . ' HTTP/' . $request->getProtocolVersion() . '" ' .
             $status . ' ' . $responseSize . ' ' . sprintf('%.3F', $time < 0 ? 0 : $time)

src/App.php

@@ -3,6 +3,7 @@
 namespace FrameworkX;
 
 use FrameworkX\Io\FiberHandler;
+use FrameworkX\Io\LogStreamHandler;
 use FrameworkX\Io\MiddlewareHandler;
 use FrameworkX\Io\RedirectHandler;
 use FrameworkX\Io\RouteHandler;
@@ -24,9 +25,12 @@ class App
     /** @var RouteHandler */
     private $router;
 
-    /** @var SapiHandler */
+    /** @var ?SapiHandler */
     private $sapi;
 
+    /** @var ?LogStreamHandler */
+    private $logger;
+
     /** @var Container */
     private $container;
 
@@ -115,7 +119,8 @@ public function __construct(...$middleware)
         $this->router = new RouteHandler($this->container);
         $handlers[] = $this->router;
         $this->handler = new MiddlewareHandler($handlers);
-        $this->sapi = new SapiHandler();
+        $this->sapi = (\PHP_SAPI !== 'cli' ? new SapiHandler() : null);
+        $this->logger = (\PHP_SAPI === 'cli' ? new LogStreamHandler('php://output') : null);
     }
 
     /**
@@ -231,6 +236,9 @@ public function run(): void
 
     private function runLoop(): void
     {
+        $logger = $this->logger;
+        assert($logger instanceof LogStreamHandler);
+
         $http = new HttpServer(function (ServerRequestInterface $request) {
             return $this->handleRequest($request);
         });
@@ -240,31 +248,31 @@ private function runLoop(): void
         $socket = new SocketServer($listen);
         $http->listen($socket);
 
-        $this->sapi->log('Listening on ' . \str_replace('tcp:', 'http:', (string) $socket->getAddress()));
+        $logger->log('Listening on ' . \str_replace('tcp:', 'http:', (string) $socket->getAddress()));
 
-        $http->on('error', function (\Exception $e): void {
-            $this->sapi->log('HTTP error: ' . $e->getMessage());
+        $http->on('error', static function (\Exception $e) use ($logger): void {
+            $logger->log('HTTP error: ' . $e->getMessage());
         });
 
         // @codeCoverageIgnoreStart
         try {
-            Loop::addSignal(\defined('SIGINT') ? \SIGINT : 2, $f1 = function () use ($socket) {
+            Loop::addSignal(\defined('SIGINT') ? \SIGINT : 2, $f1 = static function () use ($socket, $logger) {
                 if (\PHP_VERSION_ID >= 70200 && \stream_isatty(\STDIN)) {
                     echo "\r";
                 }
-                $this->sapi->log('Received SIGINT, stopping loop');
+                $logger->log('Received SIGINT, stopping loop');
 
                 $socket->close();
                 Loop::stop();
             });
-            Loop::addSignal(\defined('SIGTERM') ? \SIGTERM : 15, $f2 = function () use ($socket) {
-                $this->sapi->log('Received SIGTERM, stopping loop');
+            Loop::addSignal(\defined('SIGTERM') ? \SIGTERM : 15, $f2 = static function () use ($socket, $logger) {
+                $logger->log('Received SIGTERM, stopping loop');
 
                 $socket->close();
                 Loop::stop();
             });
         } catch (\BadMethodCallException $e) {
-            $this->sapi->log('Notice: No signal handler support, installing ext-ev or ext-pcntl recommended for production use.');
+            $logger->log('Notice: No signal handler support, installing ext-ev or ext-pcntl recommended for production use.');
         }
         // @codeCoverageIgnoreEnd
 
@@ -273,7 +281,7 @@ private function runLoop(): void
 
             if ($socket->getAddress() !== null) {
                 // Fiber compatibility mode for PHP < 8.1: Restart loop as long as socket is available
-                $this->sapi->log('Warning: Loop restarted. Upgrade to react/async v4 recommended for production use.');
+                $logger->log('Warning: Loop restarted. Upgrade to react/async v4 recommended for production use.');
             } else {
                 break;
             }
@@ -286,6 +294,7 @@ private function runLoop(): void
 
     private function runOnce(): void
     {
+        assert($this->sapi instanceof SapiHandler);
         $request = $this->sapi->requestFromGlobals();
 
         $response = $this->handleRequest($request);
@@ -294,6 +303,7 @@ private function runOnce(): void
             $this->sapi->sendResponse($response);
         } elseif ($response instanceof PromiseInterface) {
             $response->then(function (ResponseInterface $response) {
+                assert($this->sapi instanceof SapiHandler);
                 $this->sapi->sendResponse($response);
             });
         }

src/Io/LogStreamHandler.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace FrameworkX\Io;
+
+/**
+ * @internal
+ */
+class LogStreamHandler
+{
+    /** @var resource */
+    private $stream;
+
+    /** @throws \RuntimeException if given `$path` can not be opened in append mode */
+    public function __construct(string $path)
+    {
+        $errstr = '';
+        \set_error_handler(function (int $_, string $error) use (&$errstr): bool {
+            // Match errstr from PHP's warning message.
+            // fopen(/dev/not-a-valid-path): Failed to open stream: Permission denied
+            $errstr = \preg_replace('#.*: #', '', $error);
+
+            return true;
+        });
+
+        $stream = \fopen($path, 'ae');
+        \restore_error_handler();
+
+        if ($stream === false) {
+            throw new \RuntimeException(
+                'Unable to open log file "' . $path . '": ' . $errstr
+            );
+        }
+
+        $this->stream = $stream;
+    }
+
+    public function log(string $message): void
+    {
+        $time = \microtime(true);
+        $prefix = \date('Y-m-d H:i:s', (int) $time) . \sprintf('.%03d ', (int) (($time - (int) $time) * 1e3));
+
+        $ret = \fwrite($this->stream, $prefix . $message . \PHP_EOL);
+        assert(\is_int($ret));
+    }
+}

src/Io/SapiHandler.php

@@ -13,15 +13,6 @@
  */
 class SapiHandler
 {
-    /** @var resource */
-    private $logStream;
-
-    public function __construct()
-    {
-        // @phpstan-ignore-next-line because `fopen()` is known to always return a `resource` for built-in wrappers
-        $this->logStream = PHP_SAPI === 'cli' ? \fopen('php://output', 'a') : (\defined('STDERR') ? \STDERR : \fopen('php://stderr', 'a'));
-    }
-
     public function requestFromGlobals(): ServerRequestInterface
     {
         $host = null;
@@ -140,12 +131,4 @@ public function sendResponse(ResponseInterface $response): void
             echo $body;
         }
     }
-
-    public function log(string $message): void
-    {
-        $time = microtime(true);
-        $log = date('Y-m-d H:i:s', (int)$time) . sprintf('.%03d ', (int)(($time - (int)$time) * 1e3)) . $message . PHP_EOL;
-
-        fwrite($this->logStream, $log);
-    }
 }