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 reactphp#405 and partially on reactphp#422

README.md

@@ -78,6 +78,7 @@ multiple concurrent HTTP requests without blocking.
         * [ServerRequest](#serverrequest)
         * [ResponseException](#responseexception)
     * [React\Http\Middleware](#reacthttpmiddleware)
+        * [InactiveConnectionTimeoutMiddleware](#inactiveconnectiontimeoutmiddleware)
         * [StreamingRequestMiddleware](#streamingrequestmiddleware)
         * [LimitConcurrentRequestsMiddleware](#limitconcurrentrequestsmiddleware)
         * [RequestBodyBufferMiddleware](#requestbodybuffermiddleware)
@@ -2630,6 +2631,22 @@ 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 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". 
+
 #### StreamingRequestMiddleware
 
 The `React\Http\Middleware\StreamingRequestMiddleware` can be used to

src/HttpServer.php

@@ -5,9 +5,12 @@
 use Evenement\EventEmitter;
 use React\EventLoop\Loop;
 use React\EventLoop\LoopInterface;
+use React\Http\Io\Clock;
 use React\Http\Io\IniUtil;
 use React\Http\Io\MiddlewareRunner;
+use React\Http\Io\RequestHeaderParser;
 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 +222,13 @@ public function __construct($requestHandlerOrLoop)
         }
 
         $streaming = false;
+        $idleConnectTimeout = InactiveConnectionTimeoutMiddleware::DEFAULT_TIMEOUT;
         foreach ((array) $requestHandlers as $handler) {
             if ($handler instanceof StreamingRequestMiddleware) {
                 $streaming = true;
-                break;
+            }
+            if ($handler instanceof InactiveConnectionTimeoutMiddleware) {
+                $idleConnectTimeout = $handler->getTimeout();
             }
         }
 
@@ -252,10 +258,11 @@ 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));
+        $clock = new Clock($loop);
+        $this->streamingServer = new StreamingServer(new MiddlewareRunner($middleware), new RequestHeaderParser($loop, $clock, $idleConnectTimeout), $clock);
 
         $that = $this;
         $this->streamingServer->on('error', function ($error) use ($that) {

src/Io/RequestHeaderParser.php

@@ -4,6 +4,7 @@
 
 use Evenement\EventEmitter;
 use Psr\Http\Message\ServerRequestInterface;
+use React\EventLoop\LoopInterface;
 use React\Http\Message\Response;
 use React\Http\Message\ServerRequest;
 use React\Socket\ConnectionInterface;
@@ -24,23 +25,53 @@ class RequestHeaderParser extends EventEmitter
 {
     private $maxSize = 8192;
 
+    /**
+     * @var LoopInterface
+     */
+    private $loop;
+
     /** @var Clock */
     private $clock;
 
+    /**
+     * @var float
+     */
+    private $idleConnectionTimeout;
+
     /** @var array<string|int,array<string,string>> */
     private $connectionParams = array();
 
-    public function __construct(Clock $clock)
+    /**
+     * @param LoopInterface $loop
+     * @param float $idleConnectionTimeout
+     */
+    public function __construct(LoopInterface $loop, Clock $clock, $idleConnectionTimeout)
     {
+        $this->loop = $loop;
         $this->clock = $clock;
+        $this->idleConnectionTimeout = $idleConnectionTimeout;
     }
 
     public function handle(ConnectionInterface $conn)
     {
+        $loop = $this->loop;
+        $idleConnectionTimeout = $this->idleConnectionTimeout;
+        $that = $this;
+        $idleConnectionTimeoutHandler = function () use ($that, $conn) {
+            $that->emit('error', array(
+                new \RuntimeException('Request timed out', Response::STATUS_REQUEST_TIMEOUT),
+                $conn
+            ));
+            $conn->close();
+        };
+        $timer = $loop->addTimer($idleConnectionTimeout, $idleConnectionTimeoutHandler);
+        $conn->on('close', function () use ($loop, &$timer) {
+            $loop->cancelTimer($timer);
+        });
         $buffer = '';
         $maxSize = $this->maxSize;
-        $that = $this;
-        $conn->on('data', $fn = function ($data) use (&$buffer, &$fn, $conn, $maxSize, $that) {
+        $conn->on('data', $fn = function ($data) use (&$buffer, &$fn, $conn, $maxSize, $that, $loop, &$timer, $idleConnectionTimeout, $idleConnectionTimeoutHandler) {
+            $loop->cancelTimer($timer);
             // append chunk of data to buffer and look for end of request headers
             $buffer .= $data;
             $endOfHeader = \strpos($buffer, "\r\n\r\n");
@@ -59,6 +90,7 @@ public function handle(ConnectionInterface $conn)
 
             // ignore incomplete requests
             if ($endOfHeader === false) {
+                $timer = $loop->addTimer($idleConnectionTimeout, $idleConnectionTimeoutHandler);
                 return;
             }
 

src/Io/StreamingServer.php

@@ -5,7 +5,6 @@
 use Evenement\EventEmitter;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
-use React\EventLoop\LoopInterface;
 use React\Http\Message\Response;
 use React\Http\Message\ServerRequest;
 use React\Promise;
@@ -28,7 +27,7 @@
  * object in return:
  *
  * ```php
- * $server = new StreamingServer($loop, function (ServerRequestInterface $request) {
+ * $server = new StreamingServer(function (ServerRequestInterface $request) {
  *     return new Response(
  *         Response::STATUS_OK,
  *         array(
@@ -53,7 +52,7 @@
  * in order to start a plaintext HTTP server like this:
  *
  * ```php
- * $server = new StreamingServer($loop, $handler);
+ * $server = new StreamingServer($handler);
  *
  * $socket = new React\Socket\SocketServer('0.0.0.0:8080', array(), $loop);
  * $server->listen($socket);
@@ -86,6 +85,8 @@ final class StreamingServer extends EventEmitter
 
     /** @var Clock */
     private $clock;
+    private $loop;
+    private $idleConnectionTimeout;
 
     /**
      * Creates an HTTP server that invokes the given callback for each incoming HTTP request
@@ -95,19 +96,19 @@ 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 float $idleConnectTimeout
      * @see self::listen()
      */
-    public function __construct(LoopInterface $loop, $requestHandler)
+    public function __construct($requestHandler, RequestHeaderParser $parser, Clock $clock)
     {
         if (!\is_callable($requestHandler)) {
             throw new \InvalidArgumentException('Invalid request handler given');
         }
 
         $this->callback = $requestHandler;
-        $this->clock = new Clock($loop);
-        $this->parser = new RequestHeaderParser($this->clock);
+        $this->clock = $clock;
+        $this->parser = $parser;
 
         $that = $this;
         $this->parser->on('headers', function (ServerRequestInterface $request, ConnectionInterface $conn) use ($that) {

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;
@@ -60,10 +62,18 @@ 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);
 
+        $ref = new \ReflectionProperty($parser, 'loop');
+        $ref->setAccessible(true);
+        $loop = $ref->getValue($parser);
+
         $this->assertInstanceOf('React\EventLoop\LoopInterface', $loop);
     }
 
@@ -257,6 +267,18 @@ 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 +461,7 @@ 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);