[Stream] Fix infinite loop writing to closed stream

Author: cboden

Buffer.php

@@ -4,7 +4,6 @@
 
 use Evenement\EventEmitter;
 use React\EventLoop\LoopInterface;
-use React\Stream\WritableStreamInterface;
 
 /** @event full-drain */
 class Buffer extends EventEmitter implements WritableStreamInterface
@@ -83,8 +82,8 @@ public function close()
 
     public function handleWrite()
     {
-        if (!is_resource($this->stream) || ('generic_socket' === $this->meta['stream_type'] && feof($this->stream))) {
-            $this->emit('error', array(new \RuntimeException('Tried to write to closed or invalid stream.')));
+        if (!is_resource($this->stream)) {
+            $this->emit('error', array(new \RuntimeException('Tried to write to invalid stream.'), $this));
 
             return;
         }
@@ -107,6 +106,12 @@ public function handleWrite()
             return;
         }
 
+        if (0 === $sent && feof($this->stream)) {
+            $this->emit('error', array(new \RuntimeException('Tried to write to closed stream.'), $this));
+
+            return;
+        }
+
         $len = strlen($this->data);
         if ($len >= $this->softLimit && $len - $sent < $this->softLimit) {
             $this->emit('drain');