[Twisted-Python] Streaming File Transfer Protocol?

[Mark Bailey]

How about:


# Copyright (c) 2001-2004 Twisted Matrix Laboratories.
# See LICENSE for details.


"""
An example client. Run simpleserv.py first before running this.
"""

from twisted.internet import reactor, protocol


# a client protocol

class EchoClient(protocol.Protocol):
    """Once connected, send a message, then print the result."""

    def connectionMade(self):
        self.transport.write("hello, world!")

    def dataReceived(self, data):
        "As soon as any data is received, write it back."
        print "Server said:", data
        self.transport.loseConnection()

    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()


-------------------------


# Copyright (c) 2001-2004 Twisted Matrix Laboratories.
# See LICENSE for details.


from twisted.internet import reactor, protocol


class Echo(protocol.Protocol):
    """This is just about the simplest possible protocol"""

    def dataReceived(self, data):
        "As soon as any data is received, write it back."
        self.transport.write(data)


def main():
    """This runs the protocol on port 8000"""
    factory = protocol.ServerFactory()
    factory.protocol = Echo
    reactor.listenTCP(8000,factory)
    reactor.run()

# this only runs if the module was *not* imported
if __name__ == '__main__':
    main()

-----

Mark


On Wed, Feb 10, 2010 at 1:54 PM, Darren Govoni <darren at ontrenet.com> wrote:

>  Hey Mark,
>    Yeah, that's what I want, but in the 'twisted' way. I can write socket
> servers, etc. But didn't notice a good example of how to do this in Twisted
> (sparing me the socket programming),  until I found this old message[1] with
> the classes I think might work.
>
> [1]
> http://twistedmatrix.com/pipermail/twisted-python/2007-July/015738.html
>
> Darren
>
> On Wed, 2010-02-10 at 13:36 -0500, Mark Bailey wrote:
>
> Hi Darren:
>
> Why not use TCP?  You can send the length of the file at the beginning so
> you know how many bytes to listen for.
> TCP guarantees delivery and ordering.
>
> Mark
>
>  On Wed, Feb 10, 2010 at 12:22 PM, Darren Govoni <darren at ontrenet.com>
> wrote:
>
>  Hi,
>   Is there an existing protocol that can provide the following?
>
> - Accept stream binary data FROM a client (e.g. very large file transfer)
> - Receive data IN ORDER (i.e. stream. not out of order random packets)
>
> I want to stream FROM a client to the protocol server and have the
> server process the stream bytes incrementally so it doesn't have
> to store or write the entire data stream (too large).
>
> I looked at FileTransferServer and Client, but I'm not sure it provides
> what I need.
>
> Any tips appreciated!
> Darren
>
>
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