Look up errno based on errstr when listening for connections fails

Author: clue

src/SocketServer.php

@@ -113,30 +113,45 @@ public static function accept($socket)
             // stream_socket_accept(): accept failed: Connection timed out
             $error = \error_get_last();
             $errstr = \preg_replace('#.*: #', '', $error['message']);
-
-            // Go through list of possible error constants to find matching errno.
-            // @codeCoverageIgnoreStart
-            $errno = 0;
-            if (\function_exists('socket_strerror')) {
-                foreach (\get_defined_constants(false) as $name => $value) {
-                    if (\strpos($name, 'SOCKET_E') === 0 && \socket_strerror($value) === $errstr) {
-                        $errno = $value;
-                        $errstr .= ' (' . \substr($name, 7) . ')';
-                        break;
-                    }
-                }
-            }
-            // @codeCoverageIgnoreEnd
+            $errno = self::errno($errstr);
 
             throw new \RuntimeException(
-                'Unable to accept new connection: ' . $errstr,
+                'Unable to accept new connection: ' . $errstr . self::errconst($errno),
                 $errno
             );
         }
 
         return $newSocket;
     }
 
+    /**
+     * [Internal] Returns errno value for given errstr
+     *
+     * The errno and errstr values describes the type of error that has been
+     * encountered. This method tries to look up the given errstr and find a
+     * matching errno value which can be useful to provide more context to error
+     * messages. It goes through the list of known errno constants when
+     * ext-sockets is available to find an errno matching the given errstr.
+     *
+     * @param string $errstr
+     * @return int errno value (e.g. value of `SOCKET_ECONNREFUSED`) or 0 if not found
+     * @internal
+     * @copyright Copyright (c) 2018 Christian Lück, taken from https://github.com/clue/errno with permission
+     * @codeCoverageIgnore
+     */
+    public static function errno($errstr)
+    {
+        if (\function_exists('socket_strerror')) {
+            foreach (\get_defined_constants(false) as $name => $value) {
+                if (\strpos($name, 'SOCKET_E') === 0 && \socket_strerror($value) === $errstr) {
+                    return $value;
+                }
+            }
+        }
+
+        return 0;
+    }
+
     /**
      * [Internal] Returns errno constant name for given errno value
      *

src/TcpServer.php

@@ -175,6 +175,12 @@ public function __construct($uri, LoopInterface $loop = null, array $context = a
             \stream_context_create(array('socket' => $context + array('backlog' => 511)))
         );
         if (false === $this->master) {
+            if ($errno === 0) {
+                // PHP does not seem to report errno, so match errno from errstr
+                // @link https://3v4l.org/3qOBl
+                $errno = SocketServer::errno($errstr);
+            }
+
             throw new \RuntimeException(
                 'Failed to listen on "' . $uri . '": ' . $errstr . SocketServer::errconst($errno),
                 $errno

tests/TcpServerTest.php

@@ -51,6 +51,7 @@ public function testConstructWithoutLoopAssignsLoopAutomatically()
     public function testServerEmitsConnectionEventForNewConnection()
     {
         $client = stream_socket_client('tcp://localhost:'.$this->port);
+        assert($client !== false);
 
         $server = $this->server;
         $promise = new Promise(function ($resolve) use ($server) {
@@ -70,6 +71,7 @@ public function testConnectionWithManyClients()
         $client1 = stream_socket_client('tcp://localhost:'.$this->port);
         $client2 = stream_socket_client('tcp://localhost:'.$this->port);
         $client3 = stream_socket_client('tcp://localhost:'.$this->port);
+        assert($client1 !== false && $client2 !== false && $client3 !== false);
 
         $this->server->on('connection', $this->expectCallableExactly(3));
         $this->tick();
@@ -80,6 +82,7 @@ public function testConnectionWithManyClients()
     public function testDataEventWillNotBeEmittedWhenClientSendsNoData()
     {
         $client = stream_socket_client('tcp://localhost:'.$this->port);
+        assert($client !== false);
 
         $mock = $this->expectCallableNever();
 
@@ -150,6 +153,7 @@ public function testGetAddressAfterCloseReturnsNull()
     public function testLoopWillEndWhenServerIsClosedAfterSingleConnection()
     {
         $client = stream_socket_client('tcp://localhost:' . $this->port);
+        assert($client !== false);
 
         // explicitly unset server because we only accept a single connection
         // and then already call close()
@@ -203,6 +207,7 @@ public function testDataWillBeEmittedInMultipleChunksWhenClientSendsExcessiveAmo
     public function testConnectionDoesNotEndWhenClientDoesNotClose()
     {
         $client = stream_socket_client('tcp://localhost:'.$this->port);
+        assert($client !== false);
 
         $mock = $this->expectCallableNever();
 
@@ -236,7 +241,7 @@ public function testCtorAddsResourceToLoop()
         $loop = $this->getMockBuilder('React\EventLoop\LoopInterface')->getMock();
         $loop->expects($this->once())->method('addReadStream');
 
-        $server = new TcpServer(0, $loop);
+        new TcpServer(0, $loop);
     }
 
     public function testResumeWithoutPauseIsNoOp()
@@ -316,7 +321,7 @@ public function testEmitsErrorWhenAcceptListenerFails()
     public function testEmitsTimeoutErrorWhenAcceptListenerFails(\RuntimeException $exception)
     {
         if (defined('HHVM_VERSION')) {
-            $this->markTestSkipped('not supported on HHVM');
+            $this->markTestSkipped('Not supported on HHVM');
         }
 
         $this->assertEquals('Unable to accept new connection: ' . socket_strerror(SOCKET_ETIMEDOUT) . ' (ETIMEDOUT)', $exception->getMessage());
@@ -328,9 +333,16 @@ public function testListenOnBusyPortThrows()
         if (DIRECTORY_SEPARATOR === '\\') {
             $this->markTestSkipped('Windows supports listening on same port multiple times');
         }
+        if (defined('HHVM_VERSION')) {
+            $this->markTestSkipped('Not supported on HHVM');
+        }
 
-        $this->setExpectedException('RuntimeException');
-        $another = new TcpServer($this->port, $this->loop);
+        $this->setExpectedException(
+            'RuntimeException',
+            'Failed to listen on "tcp://127.0.0.1:' . $this->port . '": ' . (function_exists('socket_strerror') ? socket_strerror(SOCKET_EADDRINUSE) . ' (EADDRINUSE)' : 'Address already in use'),
+            defined('SOCKET_EADDRINUSE') ? SOCKET_EADDRINUSE : 0
+        );
+        new TcpServer($this->port, $this->loop);
     }
 
     /**