[英]Problem with Twisted python - sending binary data
我想要做的很簡單:從客戶端向服務器發送文件。 首先,客戶端發送有關文件的信息 - 它的大小。 然后它發送實際文件。
這是我到目前為止所做的:
Server.py
from twisted.internet import reactor, protocol
from twisted.protocols.basic import LineReceiver
import pickle
import sys
class Echo(LineReceiver):
def connectionMade(self):
self.factory.clients.append(self)
self.setRawMode()
def connectionLost(self, reason):
self.factory.clients.remove(self)
def lineReceived(self, data):
print "line", data
def rawDataReceived(self, data):
try:
obj = pickle.loads(data)
print obj
except:
print data
#self.transport.write("wa2")
def main():
"""This runs the protocol on port 8000"""
factory = protocol.ServerFactory()
factory.protocol = Echo
factory.clients = []
reactor.listenTCP(8000,factory)
reactor.run()
# this only runs if the module was *not* imported
if __name__ == '__main__':
main()
Client.py
import pickle
from twisted.internet import reactor, protocol
import time
import os.path
from twisted.protocols.basic import LineReceiver
class EchoClient(LineReceiver):
def connectionMade(self):
file = "some file that is a couple of megs"
filesize = os.path.getsize(file)
self.sendLine(pickle.dumps({"size":filesize}))
f = open(file, "rb")
contents = f.read()
print contents[:20]
self.sendLine(contents[:20])
f.close()
# self.sendLine("hej")
# self.sendLine("wa")
def connectionLost(self, reason):
print "connection lost"
class EchoFactory(protocol.ClientFactory):
protocol = EchoClient
def clientConnectionFailed(self, connector, reason):
print "Connection failed - goodbye!"
reactor.stop()
def clientConnectionLost(self, connector, reason):
print "Connection lost - goodbye!"
reactor.stop()
# this connects the protocol to a server runing on port 8000
def main():
f = EchoFactory()
reactor.connectTCP("localhost", 8000, f)
reactor.run()
# this only runs if the module was *not* imported
if __name__ == '__main__':
main()
服務器只輸出反序列化的對象:
{'size':183574528L}
怎么會? 從我想發送的文件中發生的20個字符發生了什么?
如果使用“hej”和“wa”發送,我會得到它們(在同一個消息中,而不是兩次)。
有人?
您已使用setRawMode()將服務器設置為原始模式,因此使用傳入數據(而不是lineReceived)調用回調rawDataReceived。 如果您打印在rawDataReceived中收到的數據,您會看到包括文件內容在內的所有內容,但是當您調用pickle來反序列化數據時,它會被忽略。
您可以更改向服務器發送數據的方式(我建議使用netstring格式),也可以在pickle序列化對象中傳遞內容,並在一次調用中執行此操作。
self.sendLine(pickle.dumps({"size":filesize, 'content': contents[:20]}))
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