python3: To be safe, abort entirely if initial epoller registration fails.

[ashd.git] / python3 / ashd / async.py

diff --git a/python3/ashd/async.py b/python3/ashd/async.py
index 3493959..aa52af9 100644 (file)
--- a/python3/ashd/async.py
+++ b/python3/ashd/async.py
@@ -3,12 +3,15 @@ import sys, os, errno, threading, select, traceback
 class epoller(object):
     exc_handler = None
 
-    def __init__(self):
+    def __init__(self, check=None):
         self.registered = {}
         self.lock = threading.RLock()
         self.ep = None
         self.th = None
         self.stopped = False
+        self.loopcheck = set()
+        if check is not None:
+            self.loopcheck.add(check)
         self._daemon = True
 
     @staticmethod
@@ -26,7 +29,7 @@ class epoller(object):
     def exception(self, ch, *exc):
         self.remove(ch)
         if self.exc_handler is None:
-            traceback.print_exception(exc)
+            traceback.print_exception(*exc)
         else:
             self.exc_handler(ch, *exc)
 
@@ -51,11 +54,17 @@ class epoller(object):
         ep = select.epoll()
         try:
             with self.lock:
-                for fd, (ob, evs) in self.registered.items():
-                    ep.register(fd, evs)
+                try:
+                    for fd, (ob, evs) in self.registered.items():
+                        ep.register(fd, evs)
+                except:
+                    self.registered.clear()
+                    raise
                 self.ep = ep
 
             while self.registered:
+                for ck in self.loopcheck:
+                    ck(self)
                 if self.stopped:
                     self._closeall()
                     break
@@ -165,12 +174,25 @@ class epoller(object):
 def watcher():
     return epoller()
 
-class sockbuffer(object):
-    def __init__(self, sk):
-        self.sk = sk
+class channel(object):
+    readable = False
+    writable = False
+
+    def __init__(self):
+        self.watcher = None
+
+    def fileno(self):
+        raise NotImplementedError("fileno()")
+
+    def close(self):
+        pass
+
+class sockbuffer(channel):
+    def __init__(self, socket, **kwargs):
+        super().__init__(**kwargs)
+        self.sk = socket
         self.eof = False
         self.obuf = bytearray()
-        self.watcher = None
 
     def fileno(self):
         return self.sk.fileno()
@@ -211,8 +233,9 @@ class sockbuffer(object):
             self.obuf[:] = b""
             self.eof = True
 
-class callbuffer(object):
-    def __init__(self):
+class callbuffer(channel):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
         self.queue = []
         self.rp, self.wp = os.pipe()
         self.lock = threading.Lock()
@@ -264,8 +287,7 @@ class callbuffer(object):
                 self.wp = -1
 
 def currentwatcher(io, current):
-    def run():
-        while current:
-            current.wait()
-        io.stop()
-    threading.Thread(target=run, name="Current watcher").start()
+    def check(io):
+        if not current:
+            io.stop()
+    io.loopcheck.add(check)