Silence "No route to host" and "Connection timedout" errors when clie…

…nts dissapear

networkserver.py

@@ -23,10 +23,13 @@
 from time import time
 import traceback
 from util import ScheduleDict, WithNoop, tryErr
+from errno import EHOSTUNREACH, ETIMEDOUT
 
 EPOLL_READ = select.EPOLLIN | select.EPOLLPRI | select.EPOLLERR | select.EPOLLHUP
 EPOLL_WRITE = select.EPOLLOUT
 
+_DISCONNECTED = frozenset((EHOSTUNREACH,ETIMEDOUT))
+
 class SocketHandler:
 	ac_in_buffer_size = 4096
 	ac_out_buffer_size = 4096
@@ -46,7 +49,12 @@ def handle_read(self):
 		try:
 			data = self.recv (self.ac_in_buffer_size)
 		except socket.error as why:
-			self.handle_error()
+			# This silences some additional expected socket errors
+			# not automatically dealt with by asyncore.
+			if why.args[0] not in _DISCONNECTED:
+				self.handle_error()
+			else:
+				self.handle_close()
 			return
 
 		if self.closeme: