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Actually the class asyncore.dispatcher_with_send do not handle properly disconnection. When the endpoint shutdown his sending part of the socket, but keep the socket open in reading, the current implementation of dispatcher_with_send will close the socket without sending pending data.
Adding this method to the class fix the problem:
 def handle_close(self):
 if not self.writable():
 dispatcher.close()
Note also that this class try to initiate a send even if the socket is maybe not ready for writing:
Here's a simple fix:
 def send(self, data):
 if self.debug:
 self.log_info('sending %s' % repr(data))
 self.out_buffer = self.out_buffer + data
- self.initiate_send()
Last but not last, the buffer size of each socket send are way to small (512, a third of an usual TCP frame). Here's the code with a bumped value:
 def initiate_send(self):
 num_sent = 0
- num_sent = dispatcher.send(self, self.out_buffer[:512])
+ num_sent = dispatcher.send(self, self.out_buffer[:8192])
 self.out_buffer = self.out_buffer[num_sent:]
Thanks for reading,