Close inactive connections and requests

This new middleware introduces a timeout of closing inactive
connections between requests after a configured amount of seconds.

This builds on top of #405 and partially on #422

README.md

@@ -82,6 +82,7 @@ multiple concurrent HTTP requests without blocking.
         * [Uri](#uri)
         * [ResponseException](#responseexception)
     * [React\Http\Middleware](#reacthttpmiddleware)
+        * [InactiveConnectionTimeoutMiddleware](#inactiveconnectiontimeoutmiddleware)
         * [StreamingRequestMiddleware](#streamingrequestmiddleware)
         * [LimitConcurrentRequestsMiddleware](#limitconcurrentrequestsmiddleware)
         * [RequestBodyBufferMiddleware](#requestbodybuffermiddleware)
@@ -2692,6 +2693,25 @@ access its underlying response object.
 
 ### React\Http\Middleware
 
+#### InactiveConnectionTimeoutMiddleware
+
+The `React\Http\Middleware\InactiveConnectionTimeoutMiddleware` is purely a configuration middleware to configure the
+`HttpServer` to close any inactive connections between requests to close the connection and not leave them needlessly 
+open. The default is `60` seconds of inactivity and should only be changed if you know what you are doing.
+
+The following example configures the `HttpServer` to close any inactive connections after one and a half second:
+
+```php
+$http = new React\Http\HttpServer(
+    new React\Http\Middleware\InactiveConnectionTimeoutMiddleware(1.5),
+    $handler
+);
+```
+> Internally, this class is used as a "value object" to override the default timeout of one minute.
+  As such it doesn't have any behavior internally, that is all in the internal "StreamingServer". 
+  This timeout is only in effect if we expect data from the client, not when we are writing data to
+  the client.
+
 #### StreamingRequestMiddleware
 
 The `React\Http\Middleware\StreamingRequestMiddleware` can be used to

src/HttpServer.php

@@ -8,6 +8,7 @@
 use React\Http\Io\IniUtil;
 use React\Http\Io\MiddlewareRunner;
 use React\Http\Io\StreamingServer;
+use React\Http\Middleware\InactiveConnectionTimeoutMiddleware;
 use React\Http\Middleware\LimitConcurrentRequestsMiddleware;
 use React\Http\Middleware\StreamingRequestMiddleware;
 use React\Http\Middleware\RequestBodyBufferMiddleware;
@@ -219,10 +220,13 @@ public function __construct($requestHandlerOrLoop)
         }
 
         $streaming = false;
+        $idleConnectionTimeout = InactiveConnectionTimeoutMiddleware::DEFAULT_TIMEOUT;
         foreach ((array) $requestHandlers as $handler) {
             if ($handler instanceof StreamingRequestMiddleware) {
                 $streaming = true;
-                break;
+            }
+            if ($handler instanceof InactiveConnectionTimeoutMiddleware) {
+                $idleConnectionTimeout = $handler->getTimeout();
             }
         }
 
@@ -252,10 +256,10 @@ public function __construct($requestHandlerOrLoop)
          * doing anything with the request.
          */
         $middleware = \array_filter($middleware, function ($handler) {
-            return !($handler instanceof StreamingRequestMiddleware);
+            return !($handler instanceof StreamingRequestMiddleware) && !($handler instanceof InactiveConnectionTimeoutMiddleware);
         });
 
-        $this->streamingServer = new StreamingServer($loop, new MiddlewareRunner($middleware));
+        $this->streamingServer = new StreamingServer($loop, new MiddlewareRunner($middleware), $idleConnectionTimeout);
 
         $that = $this;
         $this->streamingServer->on('error', function ($error) use ($that) {

src/Io/StreamingServer.php

@@ -87,6 +87,12 @@ final class StreamingServer extends EventEmitter
     /** @var Clock */
     private $clock;
 
+    /** @var LoopInterface */
+    private $loop;
+
+    /** @var int */
+    private $idleConnectionTimeout;
+
     /**
      * Creates an HTTP server that invokes the given callback for each incoming HTTP request
      *
@@ -95,19 +101,21 @@ final class StreamingServer extends EventEmitter
      * connections in order to then parse incoming data as HTTP.
      * See also [listen()](#listen) for more details.
      *
-     * @param LoopInterface $loop
      * @param callable $requestHandler
+     * @param int $idleConnectionTimeout
      * @see self::listen()
      */
-    public function __construct(LoopInterface $loop, $requestHandler)
+    public function __construct(LoopInterface $loop, $requestHandler, $idleConnectionTimeout)
     {
         if (!\is_callable($requestHandler)) {
             throw new \InvalidArgumentException('Invalid request handler given');
         }
 
+        $this->loop = $loop;
         $this->callback = $requestHandler;
         $this->clock = new Clock($loop);
         $this->parser = new RequestHeaderParser($this->clock);
+        $this->idleConnectionTimeout = $idleConnectionTimeout;
 
         $that = $this;
         $this->parser->on('headers', function (ServerRequestInterface $request, ConnectionInterface $conn) use ($that) {
@@ -134,7 +142,32 @@ public function __construct(LoopInterface $loop, $requestHandler)
      */
     public function listen(ServerInterface $socket)
     {
-        $socket->on('connection', array($this->parser, 'handle'));
+        $socket->on('connection', array($this, 'handleConnection'));
+    }
+
+    /** @internal */
+    public function handleConnection(ConnectionInterface $connection)
+    {
+        $idleConnectionTimeout = $this->idleConnectionTimeout;
+        $loop = $this->loop;
+        $idleConnectionTimeoutHandler = function () use ($connection) {
+            $connection->close();
+        };
+        $timer = $this->loop->addTimer($idleConnectionTimeout, $idleConnectionTimeoutHandler);
+        $closeTimerHandler = function () use ($connection, &$closeTimerHandler, &$dataTimerHandler, $loop, &$timer) {
+            $connection->removeListener('close', $closeTimerHandler);
+            $connection->removeListener('data', $dataTimerHandler);
+
+            $loop->cancelTimer($timer);
+        };
+        $dataTimerHandler = function () use ($loop, $idleConnectionTimeout, $idleConnectionTimeoutHandler, &$timer) {
+            $loop->cancelTimer($timer);
+            $timer = $loop->addTimer($idleConnectionTimeout, $idleConnectionTimeoutHandler);
+        };
+        $connection->on('close', $closeTimerHandler);
+        $connection->on('data', $dataTimerHandler);
+
+        $this->parseRequest($connection);
     }
 
     /** @internal */
@@ -359,7 +392,7 @@ public function handleResponse(ConnectionInterface $connection, ServerRequestInt
 
             // either wait for next request over persistent connection or end connection
             if ($persist) {
-                $this->parser->handle($connection);
+                $this->parseRequest($connection);
             } else {
                 $connection->end();
             }
@@ -380,13 +413,40 @@ public function handleResponse(ConnectionInterface $connection, ServerRequestInt
         // write streaming body and then wait for next request over persistent connection
         if ($persist) {
             $body->pipe($connection, array('end' => false));
-            $parser = $this->parser;
-            $body->on('end', function () use ($connection, $parser, $body) {
+            $that = $this;
+            $body->on('end', function () use ($connection, $body, &$that) {
                 $connection->removeListener('close', array($body, 'close'));
-                $parser->handle($connection);
+                $that->parseRequest($connection);
             });
         } else {
             $body->pipe($connection);
         }
     }
+
+    /**
+     * @internal
+     */
+    public function parseRequest(ConnectionInterface $connection)
+    {
+        $idleConnectionTimeout = $this->idleConnectionTimeout;
+        $loop = $this->loop;
+        $parser = $this->parser;
+        $idleConnectionTimeoutHandler = function () use ($connection) {
+            $connection->close();
+        };
+        $timer = $this->loop->addTimer($idleConnectionTimeout, $idleConnectionTimeoutHandler);
+        $removeTimerHandler = function ($_, $conn) use ($loop, $timer, $parser, $connection, &$removeTimerHandler) {
+            if (\spl_object_hash($conn) !== \spl_object_hash($connection)) {
+                return;
+            }
+
+            $loop->cancelTimer($timer);
+            $parser->removeListener('headers', $removeTimerHandler);
+            $parser->removeListener('error', $removeTimerHandler);
+        };
+        $this->parser->on('headers', $removeTimerHandler);
+        $this->parser->on('error', $removeTimerHandler);
+
+        $this->parser->handle($connection);
+    }
 }

src/Middleware/InactiveConnectionTimeoutMiddleware.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace React\Http\Middleware;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use React\Http\Io\HttpBodyStream;
+use React\Http\Io\PauseBufferStream;
+use React\Promise;
+use React\Promise\PromiseInterface;
+use React\Promise\Deferred;
+use React\Stream\ReadableStreamInterface;
+
+/**
+ * Closes any inactive connection after the specified amount of seconds since last activity.
+ *
+ * This allows you to set an alternative timeout to the default one minute (60 seconds). For example
+ * thirteen and a half seconds:
+ *
+ * ```php
+ * $http = new React\Http\HttpServer(
+ *     new React\Http\Middleware\InactiveConnectionTimeoutMiddleware(13.5),
+ *     $handler
+ * );
+ *
+ * > Internally, this class is used as a "value object" to override the default timeout of one minute.
+ *   As such it doesn't have any behavior internally, that is all in the internal "StreamingServer".
+ */
+final class InactiveConnectionTimeoutMiddleware
+{
+    /**
+     * @internal
+     */
+    const DEFAULT_TIMEOUT = 60;
+
+    /**
+     * @var float
+     */
+    private $timeout;
+
+    /**
+     * @param float $timeout
+     */
+    public function __construct($timeout = self::DEFAULT_TIMEOUT)
+    {
+        $this->timeout = $timeout;
+    }
+
+    public function __invoke(ServerRequestInterface $request, $next)
+    {
+        return $next($request);
+    }
+
+    /**
+     * @return float
+     * @internal
+     */
+    public function getTimeout()
+    {
+        return $this->timeout;
+    }
+}

tests/HttpServerTest.php

@@ -6,6 +6,8 @@
 use React\EventLoop\Loop;
 use React\Http\HttpServer;
 use React\Http\Io\IniUtil;
+use React\Http\Io\StreamingServer;
+use React\Http\Middleware\InactiveConnectionTimeoutMiddleware;
 use React\Http\Middleware\StreamingRequestMiddleware;
 use React\Promise;
 use React\Promise\Deferred;
@@ -60,6 +62,10 @@ public function testConstructWithoutLoopAssignsLoopAutomatically()
         $ref->setAccessible(true);
         $clock = $ref->getValue($streamingServer);
 
+        $ref = new \ReflectionProperty($streamingServer, 'parser');
+        $ref->setAccessible(true);
+        $parser = $ref->getValue($streamingServer);
+
         $ref = new \ReflectionProperty($clock, 'loop');
         $ref->setAccessible(true);
         $loop = $ref->getValue($clock);
@@ -257,6 +263,18 @@ function (ServerRequestInterface $request) use (&$streaming) {
         $this->assertEquals(true, $streaming);
     }
 
+    public function testIdleConnectionWillBeClosedAfterConfiguredTimeout()
+    {
+        $this->connection->expects($this->once())->method('close');
+
+        $http = new HttpServer(Loop::get(), new InactiveConnectionTimeoutMiddleware(0.1), $this->expectCallableNever());
+
+        $http->listen($this->socket);
+        $this->socket->emit('connection', array($this->connection));
+
+        Loop::run();
+    }
+
     public function testForwardErrors()
     {
         $exception = new \Exception();
@@ -439,7 +457,7 @@ public function testConstructServerWithMemoryLimitDoesLimitConcurrency()
 
     public function testConstructFiltersOutConfigurationMiddlewareBefore()
     {
-        $http = new HttpServer(new StreamingRequestMiddleware(), function () { });
+        $http = new HttpServer(new InactiveConnectionTimeoutMiddleware(0), new StreamingRequestMiddleware(), function () { });
 
         $ref = new \ReflectionProperty($http, 'streamingServer');
         $ref->setAccessible(true);