From 36038382b2b8a2631716e03f595b567d01af961d Mon Sep 17 00:00:00 2001
From: Fredrik Tolf <fredrik@dolda2000.com>
Date: Wed, 1 Feb 2017 05:16:10 +0100
Subject: [PATCH] python3: Cache async channel FDs so that updates always
 happen correctly.

---
 python3/ashd/async.py | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/python3/ashd/async.py b/python3/ashd/async.py
index aa52af9..238f6b7 100644
--- a/python3/ashd/async.py
+++ b/python3/ashd/async.py
@@ -5,6 +5,7 @@ class epoller(object):
 
     def __init__(self, check=None):
         self.registered = {}
+        self.fdcache = {}
         self.lock = threading.RLock()
         self.ep = None
         self.th = None
@@ -86,6 +87,7 @@ class epoller(object):
                         if fd in self.registered:
                             nevs = self._evsfor(ch)
                             if nevs == 0:
+                                del self.fdcache[ch]
                                 del self.registered[fd]
                                 ep.unregister(fd)
                                 self._cb(ch, "close")
@@ -119,6 +121,7 @@ class epoller(object):
                 ch.close()
                 return
             ch.watcher = self
+            self.fdcache[ch] = fd
             self.registered[fd] = (ch, evs)
             if self.ep:
                 self.ep.register(fd, evs)
@@ -126,14 +129,16 @@ class epoller(object):
 
     def remove(self, ch, ignore=False):
         with self.lock:
-            fd = ch.fileno()
-            if fd not in self.registered:
+            try:
+                fd = self.fdcache[ch]
+            except KeyError:
                 if ignore:
                     return
                 raise KeyError("fd %i is not registered" % fd)
             pch, cevs = self.registered[fd]
             if pch is not ch:
                 raise ValueError("fd %i registered via object %r, cannot remove with %r" % (pch, ch))
+            del self.fdcache[ch]
             del self.registered[fd]
             if self.ep:
                 self.ep.unregister(fd)
@@ -141,8 +146,9 @@ class epoller(object):
 
     def update(self, ch, ignore=False):
         with self.lock:
-            fd = ch.fileno()
-            if fd not in self.registered:
+            try:
+                fd = self.fdcache[ch]
+            except KeyError:
                 if ignore:
                     return
                 raise KeyError("fd %i is not registered" % fd)
@@ -151,6 +157,7 @@ class epoller(object):
                 raise ValueError("fd %i registered via object %r, cannot update with %r" % (pch, ch))
             evs = self._evsfor(ch)
             if evs == 0:
+                del self.fdcache[ch]
                 del self.registered[fd]
                 if self.ep:
                     self.ep.unregister(fd)
-- 
2.11.0