Add "tcp_nodelay" option to StreamConnection (#31)

Author: rybakit

README.md

@@ -26,15 +26,19 @@ use Tarantool\Client\Packer\PurePacker;
 
 $conn = new StreamConnection();
 // or
-// $conn = new StreamConnection('tcp://127.0.0.1:3301');
-// $conn = new StreamConnection('tcp://127.0.0.1:3301', ['socket_timeout' => 5.0, 'connect_timeout' => 5.0]);
+// $conn = new StreamConnection('tcp://127.0.0.1:3301', [
+//     'socket_timeout' => 5.0, 
+//     'connect_timeout' => 5.0,
+//     'tcp_nodelay' => true,
+// ]);
+// or
 // $conn = new StreamConnection('unix:///tmp/tarantool_instance.sock');
 
 $client = new Client($conn, new PurePacker());
 // or
 // $client = new Client($conn, new PeclPacker());
 
-// If authentication credentials required
+// if authentication credentials are required
 // $client->authenticate('username', 'userpass');
 
 $space = $client->getSpace('my_space');

src/Connection/StreamConnection.php

@@ -40,6 +40,15 @@ public function open()
         $this->stream = $stream;
         stream_set_timeout($this->stream, $this->options['socket_timeout']);
 
+        // TODO
+        // use stream_context_create() for php 7.1+
+        // https://github.com/php/php-src/blob/6053987bc27e8dede37f437193a5cad448f99bce/ext/standard/tests/streams/stream_context_tcp_nodelay.phpt
+
+        if (isset($this->options['tcp_nodelay']) && function_exists('socket_import_stream')) {
+            $socket = socket_import_stream($this->stream);
+            socket_set_option($socket, SOL_TCP, TCP_NODELAY, (int) $this->options['tcp_nodelay']);
+        }
+
         $greeting = $this->read(IProto::GREETING_SIZE, 'Unable to read greeting.');
 
         return IProto::parseGreeting($greeting);

tests/Integration/ConnectionTest.php

@@ -210,6 +210,50 @@ public function testReadLargeResponse()
         $this->assertSame($data, $result->getData()[0]);
     }
 
+    /**
+     * @requires extension sockets
+     *
+     * @group tcp_only
+     * @group pure_only
+     */
+    public function testTcpNoDelayEnabled()
+    {
+        $clientBuilder = ClientBuilder::createFromEnv();
+        $clientBuilder->setConnectionOptions(['tcp_nodelay' => true]);
+
+        $client = $clientBuilder->build();
+        $client->ping();
+
+        $conn = $client->getConnection();
+        $prop = (new \ReflectionObject($conn))->getProperty('stream');
+        $prop->setAccessible(true);
+
+        $socket = socket_import_stream($prop->getValue($conn));
+        $this->assertSame(1, socket_get_option($socket, SOL_TCP, TCP_NODELAY));
+    }
+
+    /**
+     * @requires extension sockets
+     *
+     * @group tcp_only
+     * @group pure_only
+     */
+    public function testTcpNoDelayDisabled()
+    {
+        $clientBuilder = ClientBuilder::createFromEnv();
+        $clientBuilder->setConnectionOptions(['tcp_nodelay' => false]);
+
+        $client = $clientBuilder->build();
+        $client->ping();
+
+        $conn = $client->getConnection();
+        $prop = (new \ReflectionObject($conn))->getProperty('stream');
+        $prop->setAccessible(true);
+
+        $socket = socket_import_stream($prop->getValue($conn));
+        $this->assertSame(0, socket_get_option($socket, SOL_TCP, TCP_NODELAY));
+    }
+
     /**
      * @dataProvider \Tarantool\Client\Tests\GreetingDataProvider::provideGreetingsWithInvalidServerName
      */