Add Buffer::close() method

Author: clue

Datagram/Buffer.php

@@ -19,6 +19,10 @@ public function __construct(LoopInterface $loop, $socket)
 
     public function send($data, $remoteAddress = null)
     {
+        if ($this->socket === false) {
+            return;
+        }
+
         $this->outgoing []= array($data, $remoteAddress);
 
         if (!$this->listening) {
@@ -42,4 +46,19 @@ public function handleWrite()
             $this->listening = false;
         }
     }
+
+    public function close()
+    {
+        if ($this->socket === false) {
+            return false;
+        }
+
+        if ($this->listening) {
+            $this->loop->removeWriteStream($this->socket);
+            $this->listening = false;
+        }
+
+        $this->socket = false;
+        $this->outgoing = array();
+    }
 }

Datagram/Socket.php

@@ -78,6 +78,7 @@ public function close()
     {
         $this->emit('close', array($this));
         $this->pause();
+        $this->buffer->close();
         $this->removeAllListeners();
 
         fclose($this->socket);