|Version 20 (modified by itamar, 4 years ago) (diff)|
What is Twisted?
Twisted is an event-driven networking engine written in Python and licensed under the open source MIT license.
Twisted makes it easy to implement custom network applications. Here's a TCP server that echoes back everything that's written to it:
from twisted.internet import protocol, reactor class Echo(protocol.Protocol): def dataReceived(self, data): self.transport.write(data) class EchoFactory(protocol.Factory): def buildProtocol(self, addr): return Echo() reactor.listenTCP(1234, EchoFactory()) reactor.run()
Twisted includes an event-driven web server. Here's a sample web application; notice how the resource object persists in memory, rather than being recreated on each request:
from twisted.web import server, resource from twisted.internet import reactor class HelloResource(resource.Resource): isLeaf = True numberRequests = 0 def render_GET(self, request): self.numberRequests += 1 request.setHeader("content-type", "text/plain") return "I am request #" + str(self.numberRequests) + "\n" reactor.listenTCP(8080, server.Site(HelloResource())) reactor.run()
Here's a simple publish/subscribe server, where clients see all messages posted by other clients:
from twisted.internet import reactor, protocol from twisted.protocols import basic class PubProtocol(basic.LineReceiver): delimiter = "\n" def __init__(self, factory): self.factory = factory def connectionMade(self): self.factory.clients.add(self) def connectionLost(self, reason): self.factory.clients.remove(self) def lineReceived(self, line): message = "<%s> %s\n" % (self.transport.getHost(), line) for c in self.factory.clients: if c != self: c.transport.write(message) class PubFactory(protocol.Factory): def __init__(self): self.clients = set() def buildProtocol(self, addr): return PubProtocol(self) if __name__ == '__main__': reactor.listenTCP(1025, PubFactory()) reactor.run()
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