Work around write chunk size for TLS streams for PHP < 7.1.4

Author: clue

README.md

@@ -1259,6 +1259,13 @@ IRC over TLS, but should not affect HTTP over TLS (HTTPS).
 Further investigation of this issue is needed.
 For more insights, this issue is also covered by our test suite.
 
+PHP < 7.1.4 (and PHP < 7.0.18) suffers from a bug when writing big
+chunks of data over TLS streams at once.
+We try to work around this by limiting the write chunk size to 8192
+bytes for older PHP versions only.
+This is only a work-around and has a noticable performance penalty on
+affected versions.
+
 This project also supports running on HHVM.
 Note that really old HHVM < 3.8 does not support secure TLS connections, as it
 lacks the required `stream_socket_enable_crypto()` function.

composer.json

@@ -8,14 +8,13 @@
         "evenement/evenement": "^3.0 || ^2.0 || ^1.0",
         "react/dns": "^0.4.11",
         "react/event-loop": "^1.0 || ^0.5 || ^0.4 || ^0.3.5",
-        "react/stream": "^1.0 || ^0.7 || ^0.6 || ^0.5 || ^0.4.5",
+        "react/stream": "^1.0 || ^0.7.1",
         "react/promise": "^2.1 || ^1.2",
         "react/promise-timer": "~1.0"
     },
     "require-dev": {
         "clue/block-react": "^1.1",
-        "phpunit/phpunit": "~4.8",
-        "react/stream": "^1.0 || ^0.7 || ^0.6"
+        "phpunit/phpunit": "~4.8"
     },
     "autoload": {
         "psr-4": {

src/Connection.php

@@ -5,9 +5,9 @@
 use Evenement\EventEmitter;
 use React\EventLoop\LoopInterface;
 use React\Stream\DuplexResourceStream;
-use React\Stream\Stream;
 use React\Stream\Util;
 use React\Stream\WritableStreamInterface;
+use React\Stream\WritableResourceStream;
 
 /**
  * The actual connection implementation for ConnectionInterface
@@ -50,20 +50,24 @@ public function __construct($resource, LoopInterface $loop)
         // See https://bugs.php.net/bug.php?id=65137
         // https://bugs.php.net/bug.php?id=41631
         // https://github.com/reactphp/socket-client/issues/24
-        $clearCompleteBuffer = (version_compare(PHP_VERSION, '5.6.8', '<'));
-
-        // @codeCoverageIgnoreStart
-        if (class_exists('React\Stream\Stream')) {
-            // legacy react/stream < 0.7 requires additional buffer property
-            $this->input = new Stream($resource, $loop);
-            if ($clearCompleteBuffer) {
-                $this->input->bufferSize = null;
-            }
-        } else {
-            // preferred react/stream >= 0.7 accepts buffer parameter
-            $this->input = new DuplexResourceStream($resource, $loop, $clearCompleteBuffer ? -1 : null);
-        }
-        // @codeCoverageIgnoreEnd
+        $clearCompleteBuffer = PHP_VERSION_ID < 50608;
+
+        // PHP < 7.1.4 (and PHP < 7.0.18) suffers from a bug when writing big
+        // chunks of data over TLS streams at once.
+        // We try to work around this by limiting the write chunk size to 8192
+        // bytes for older PHP versions only.
+        // This is only a work-around and has a noticable performance penalty on
+        // affected versions. Please update your PHP version.
+        // This applies to all streams because TLS may be enabled later on.
+        // See https://github.com/reactphp/socket/issues/105
+        $limitWriteChunks = (PHP_VERSION_ID < 70018 || (PHP_VERSION_ID >= 70100 && PHP_VERSION_ID < 70104));
+
+        $this->input = new DuplexResourceStream(
+            $resource,
+            $loop,
+            $clearCompleteBuffer ? -1 : null,
+            new WritableResourceStream($resource, $loop, null, $limitWriteChunks ? 8192 : null)
+        );
 
         $this->stream = $resource;
 

tests/FunctionalSecureServerTest.php

@@ -98,6 +98,38 @@ public function testWritesDataInMultipleChunksToConnection()
         $this->assertEquals(400000, $received);
     }
 
+    public function testWritesMoreDataInMultipleChunksToConnection()
+    {
+        $loop = Factory::create();
+
+        $server = new TcpServer(0, $loop);
+        $server = new SecureServer($server, $loop, array(
+            'local_cert' => __DIR__ . '/../examples/localhost.pem'
+        ));
+        $server->on('connection', $this->expectCallableOnce());
+
+        $server->on('connection', function (ConnectionInterface $conn) {
+            $conn->write(str_repeat('*', 2000000));
+        });
+
+        $connector = new SecureConnector(new TcpConnector($loop), $loop, array(
+            'verify_peer' => false
+        ));
+        $promise = $connector->connect($server->getAddress());
+
+        $local = Block\await($promise, $loop, self::TIMEOUT);
+        /* @var $local React\Stream\Stream */
+
+        $received = 0;
+        $local->on('data', function ($chunk) use (&$received) {
+            $received += strlen($chunk);
+        });
+
+        Block\sleep(self::TIMEOUT, $loop);
+
+        $this->assertEquals(2000000, $received);
+    }
+
     public function testEmitsDataFromConnection()
     {
         $loop = Factory::create();