[Twisted-Python] Twisted Client

[morbidux]

Many thanks for your solution.
I've implemented it with success.

Best regards.

| On 11/10/09 6:25 AM, morbidux wrote:
|> Hi all,
|>
|> I'm writing a simple client / server application, that uses a small
|> protocol to dialog.
|>
|> I can't find in documentation any exemple that would correspond to what
|> my
|> client is supposed to do.
|>
|> Here is the basics :
|>
|>  every X seconds, call a function that check a file
|>   if file is different, connect to server
|>
|> When the client is connected, it immediatly sends data to server, using
|> the connectionMade method.
|>
|> Do I need to use while(1) loop or loopingCall ? What is the best way to
|> write a daemon that connect to a server every X seconds ?
|>
|
| You could setup a LoopingCall that calls your file checking function.
| Your file checking function can then use
| twisted.internet.protocol.ClientCreator to send your data.
|
| A simple example:
|
| import os
| from twisted.internet import reactor
| from twisted.internet.protocol import Protocol, ClientCreator
| from twisted.internet.task import LoopingCall
| from twisted.python import log
|
| def gotProtocol(p, data):
|     p.transport.write(data)
|     p.transport.loseConnection()
|
| def errHandler(reason):
|     log.err(reason)
|
| def checkFile():
|     if os.path.exists('sentry.file'):
|         c = ClientCreator(reactor, Protocol)
|         c.connectTCP("localhost", 1234).addCallback(gotProtocol, 'some
| data').addErrback(errHandler)
|
| lp = LoopingCall(checkFile)
| lp.start(5, now=True)
|
| reactor.run()
|
| --
|
| If you want to maintain state between protocol instances, then create a
| ClientFactory. You could look at how ReconnectingClientFactory is
| implemented for ideas.
|
| The Writing Clients howto should help:
| http://twistedmatrix.com/projects/core/documentation/howto/clients.html
|
|
| Lucas Taylor
|
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