Hello gals and guys,
I'm an experienced Python user and I'd like to begin playing with
Twisted.
I started RTFM the tutorial advised on the official site and I found it
really useful and well done.
Now I'd like to practice a bit by coding a little program that reads
strings from a serial device and redirects them remotely via TCP. For
that sake I'm trying to use deferred.
In the tutorial, a deferred class is instantiated at factory level, then
used and destroyed.
And here things get harder for me.
Now, in my test program I need to manage data which comes in a "random"
manner, and I thought about doing it in a few possible ways:
1. create a deferred at factory level and every time I read something
from the serial port add some callbacks:
class SerToTcpProtocol(Protocol):
def dataReceived(self, data):
# deferred is already instantiated and launched
# self.factory.sendToTcp sends data to the TCP client
self.factory.deferred.addCallback(self.factory.sendToTcp, data)
2. or, either, create a deferred at protocol level every time I receive
something, then let the deferred do what I need and destroy it:
class SerToTcpProtocol(Protocol):
def dataReceived(self, data):
d = defer.Deferred()
d.addCallback(self.factory.sendToTcp, data)
d.callback(data)
3. or again, use a deferred list:
class SerToTcpProtocol(Protocol):
def dataReceived(self, data):
d = defer.Deferred()
d.addCallback(self.factory.sendToTcp, data)
self.factory.listDeferred.addCallback(lambda d)
d.callback(data)
Or I don't know.. hints are welcome.
Thank you in advance and sorry for my english.
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