From c20ff88c1c64a6a5fd1b0290d7f927e41b1ba819 Mon Sep 17 00:00:00 2001
From: Cees-Jan Kiewiet <ceesjank@gmail.com>
Date: Mon, 13 Nov 2017 15:36:01 +0100
Subject: [PATCH] Fixed `loop->watchers[w->fd] == w` and only run listeners
 that have events

---
 src/LibUvLoop.php | 78 ++++++++++++++++++++++++++++-------------------
 1 file changed, 47 insertions(+), 31 deletions(-)

diff --git a/src/LibUvLoop.php b/src/LibUvLoop.php
index 5b3ae453..3001caeb 100644
--- a/src/LibUvLoop.php
+++ b/src/LibUvLoop.php
@@ -16,6 +16,7 @@ class LibUvLoop implements LoopInterface
     private $futureTickQueue;
     private $timerEvents;
     private $events = [];
+    private $flags = [];
     private $listeners = [];
     private $running;
     private $streamListener;
@@ -65,10 +66,7 @@ public function removeReadStream($stream)
 
         unset($this->listeners[(int) $stream]['read']);
 
-        if (!isset($this->listeners[(int) $stream]['read'])
-            && !isset($this->listeners[(int) $stream]['write'])) {
-            unset($this->events[(int) $stream]);
-        }
+        $this->____removeStream($stream);
     }
 
     /**
@@ -82,10 +80,7 @@ public function removeWriteStream($stream)
 
         unset($this->listeners[(int) $stream]['write']);
 
-        if (!isset($this->listeners[(int) $stream]['read'])
-            && !isset($this->listeners[(int) $stream]['write'])) {
-            unset($this->events[(int) $stream]);
-        }
+        $this->____removeStream($stream);
     }
 
     /**
@@ -94,12 +89,10 @@ public function removeWriteStream($stream)
     public function removeStream($stream)
     {
         if (isset($this->events[(int) $stream])) {
-
-            \uv_poll_stop($this->events[(int) $stream]);
-
             unset($this->listeners[(int) $stream]['read']);
             unset($this->listeners[(int) $stream]['write']);
-            unset($this->events[(int) $stream]);
+
+            $this->____removeStream($stream);
         }
     }
 
@@ -207,6 +200,39 @@ public function stop()
     }
 
     private function addStream($stream)
+    {
+        // Run in tick or else things epically fail with loop->watchers[w->fd] == w
+        $this->futureTick(function () use ($stream) {
+            if (!isset($this->events[(int) $stream])) {
+                $this->events[(int) $stream] = \uv_poll_init_socket($this->uv, $stream);
+            }
+
+            $this->pollStream($stream);
+        });
+    }
+
+    // To do: get latest changes in from react:master so we can use this method name internally
+    private function ____removeStream($stream)
+    {
+        // Run in tick or else things epically fail with loop->watchers[w->fd] == w
+        $this->futureTick(function () use ($stream) {
+            if (!isset($this->events[(int) $stream])) {
+                return;
+            }
+
+            if (!isset($this->listeners[(int) $stream]['read'])
+            && !isset($this->listeners[(int) $stream]['write'])) {
+                \uv_poll_stop($this->events[(int) $stream]);
+                unset($this->events[(int) $stream]);
+                unset($this->flags[(int) $stream]);
+                return;
+            }
+
+            $this->pollStream($stream);
+        });
+    }
+
+    private function pollStream($stream)
     {
         $flags = 0;
         if (isset($this->listeners[(int) $stream]['read'])) {
@@ -217,14 +243,13 @@ private function addStream($stream)
             $flags |= \UV::WRITABLE;
         }
 
-        if (!isset($this->events[(int) $stream])) {
-            $event = \uv_poll_init_socket($this->uv, $stream);
-            $this->events[(int) $stream] = $event;
-        } else {
-            $event = $this->events[(int) $stream];
+        if (isset($this->flags[(int) $stream]) && $this->flags[(int) $stream] == $flags) {
+            return;
         }
 
-        \uv_poll_start($event, $flags, $this->streamListener);
+        $this->flags[(int) $stream] = $flags;
+
+        \uv_poll_start($this->events[(int) $stream], $flags, $this->streamListener);
     }
 
     /**
@@ -236,24 +261,15 @@ private function createStreamListener()
     {
         $callback = function ($event, $status, $events, $stream) {
             if ($status !== 0) {
-
-                $flags = 0;
-                if (isset($this->listeners[(int) $stream]['read'])) {
-                    $flags |= \UV::READABLE;
-                }
-
-                if (isset($this->listeners[(int) $stream]['write'])) {
-                    $flags |= \UV::WRITABLE;
-                }
-
-                \uv_poll_start($event, $flags, $this->streamListener);
+                unset($this->flags[(int) $stream]);
+                $this->pollStream($stream);
             }
 
-            if (isset($this->listeners[(int) $stream]['read'])) {
+            if (isset($this->listeners[(int) $stream]['read']) && $events & \UV::READABLE) {
                 call_user_func($this->listeners[(int) $stream]['read'], $stream);
             }
 
-            if (isset($this->listeners[(int) $stream]['write'])) {
+            if (isset($this->listeners[(int) $stream]['write']) && $events & \UV::WRITABLE) {
                 call_user_func($this->listeners[(int) $stream]['write'], $stream);
             }
         };