Thanks for the tip, I've gone that route as it was the simplest to realize. Since I had centralized all calls to transport.write() in a wrapper in the code, I didn't had to implement an ITransport ..
It seems to "work" (modulo the cautions you iterated) .. and I no longer use reactor internals. I had to introduce a layer of buffering though (which kicks in as soon as I do a "synch"/"chopped" send .. test prg below. Thanks again, cheers === CLIENT === import binascii, time from collections import deque from twisted.internet import reactor, protocol from twisted.internet.defer import inlineCallbacks, Deferred class TricklingClientProtocol(protocol.Protocol): def __init__(self): self.send_queue = deque() self.triggered = False def _trigger(self): if not self.triggered: self.triggered = True self._send() def _send(self): if len(self.send_queue) > 0: e = self.send_queue.popleft() self.transport.write(e) reactor.callLater(0.000001, self._send) else: self.triggered = False def send(self, data, sync = False, chopsize = None): if chopsize > 0: i = 0 n = len(data) done = False while not done: j = i + chopsize if j >= n: done = True j = n self.send_queue.append(data[i:j]) i += chopsize self._trigger() #print "chopped send" else: if sync or len(self.send_queue) > 0: self.send_queue.append(data) self._trigger() #print "synced send" else: self.transport.write(data) #print "normal send" def connectionMade(self): self.transport.setTcpNoDelay(True) self.part1() def part1(self): LEN = 50 self.send("123" * LEN) for i in xrange(0, LEN): self.send("456", sync = True) self.send("789" * LEN, chopsize = 1) self.send("123" * LEN) reactor.callLater(0.3, self.part2) def part2(self): self.send("xyz" * 5) self.send("abc" * 5, chopsize = 1) reactor.callLater(5, self.transport.loseConnection) class TricklingClientFactory(protocol.ClientFactory): protocol = TricklingClientProtocol def clientConnectionFailed(self, connector, reason): reactor.stop() def clientConnectionLost(self, connector, reason): reactor.stop() if __name__ == '__main__': factory = TricklingClientFactory() reactor.connectTCP("localhost", 9000, factory) reactor.run() === SERVER ==== import binascii from twisted.internet import reactor, protocol class TricklingServerProtocol(protocol.Protocol): def __init__(self): pass def connectionMade(self): print "client accepted" self.transport.setTcpNoDelay(True) self.stats = {} def connectionLost(self, reason): print "client lost" for s in sorted(self.stats): print "%dx chop of length %d" % (self.stats[s], s) def dataReceived(self, data): l = len(data) self.stats[l] = self.stats.get(l, 0) + 1 #print data class TricklingServerFactory(protocol.ServerFactory): protocol = TricklingServerProtocol def __init__(self): pass def startFactory(self): pass def stopFactory(self): pass if __name__ == '__main__': factory = TricklingServerFactory() reactor.listenTCP(9000, factory) reactor.run() Von: twisted-python-boun...@twistedmatrix.com [mailto:twisted-python-boun...@twistedmatrix.com] Im Auftrag von Glyph Lefkowitz Gesendet: Freitag, 12. August 2011 06:06 An: Twisted general discussion Betreff: Re: [Twisted-Python] Flush socket On Aug 11, 2011, at 7:43 PM, exar...@twistedmatrix.com<mailto:exar...@twistedmatrix.com> wrote: This will always be a somewhat unreliable way to test a remote process's handling of packetization, since there are still two TCP/IP stacks which can mess around with the data in a variety of ways, but it's as good as you can do if you want to use normal sockets for this testing. This bears repeating. It's really unreliable. Really. The sizes of buffers passed to send() and recv() bear only a coincidental resemblance to each other; one test setup may reproduce them reliably when the next will suddenly behave completely differently. If you want even a reasonably reliable heuristic here, you need to send() and then introduce a delay. You can do this without your own IWriteDescriptor implementation though; just implement an ITransport that does its write() by breaking things up and then calling the underlying write() with callLater()s in-between. -glyph
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