python twisted 回调函数
This is the Twisted Get Poetry Now! client, version 3.1.
NOTE: This should not be used as the basis for production code.
import optparse, sys
from twisted.internet.protocol import Protocol, ClientFactory
def parse_args(): usage = """usage: %prog [options] [hostname]:port ... This is the Get Poetry Now! client, Twisted version 3.1 Run it like this: python get-poetry-1.py port1 port2 port3 ... If you are in the base directory of the twisted-intro package, you could run it like this: python twisted-client-3/get-poetry-1.py 10001 10002 10003 to grab poetry from servers on ports 10001, 10002, and 10003. Of course, there need to be servers listening on those ports for that to work. """
parser = optparse.OptionParser(usage)
_, addresses = parser.parse_args()
if not addresses:
print parser.format_help()
parser.exit()
def parse_address(addr):
if ':' not in addr:
host = '127.0.0.1'
port = addr
else:
host, port = addr.split(':', 1)
if not port.isdigit():
parser.error('Ports must be integers.')
return host, int(port)
return map(parse_address, addresses)class PoetryProtocol(Protocol):
poem = ''
def dataReceived(self, data):
self.poem += data
def connectionLost(self, reason):
self.poemReceived(self.poem)
def poemReceived(self, poem):
self.factory.poem_finished(poem)class PoetryClientFactory(ClientFactory):
protocol = PoetryProtocol
def __init__(self, callback, errback):
self.callback = callback
self.errback = errback
def poem_finished(self, poem):
self.callback(poem)
def clientConnectionFailed(self, connector, reason):
self.errback(reason)def get_poetry(host, port, callback, errback): """ Download a poem from the given host and port and invoke callback(poem) when the poem is complete. If there is a failure, invoke: errback(err) instead, where err is a twisted.python.failure.Failure instance. """ from twisted.internet import reactor factory = PoetryClientFactory(callback, errback) reactor.connectTCP(host, port, factory)
def poetry_main(): addresses = parse_args()
from twisted.internet import reactor
poems = []
errors = []
def got_poem(poem):
poems.append(poem)
poem_done()
def poem_failed(err):
print >>sys.stderr, 'Poem failed:', err
errors.append(err)
poem_done()
def poem_done():
if len(poems) + len(errors) == len(addresses):
reactor.stop()
for address in addresses:
host, port = address
get_poetry(host, port, got_poem, poem_failed)
reactor.run()
for poem in poems:
print poemif name == 'main': poetry_main()