problem with sockets code

[Daniel]

Hello,

I can't seem to get my sockets code to work right. Here is what I
have inside my RequestHandler handle() function:

total_data=[]

data = True
logger_server.d ebug(self.__cla ss__.__name__ + ' set data =
True')
while data:
logger_server.d ebug(self.__cla ss__.__name__ + ' receive
first readline() of data')
data = self.rfile.read line().strip()
logger_server.d ebug(self.__cla ss__.__name__ + ' first
readline() of data = %s' % data)
total_data.appe nd(data)
receivedCommand = '\n'.join(total _data)

And this is what I have inside my client code

sock=socket.soc ket(socket.AF_I NET,socket.SOCK _STREAM)
sock.connect((' localhost',5001 ))

sock.sendall('H ello, world\r\n')
data = sock.recv(1024)
sock.close()
print 'Received', repr(data)

There's a little more to it, but this is enough for me to ask my
question. The problem is that I can't get the server loop (while
data:) to stop without closing the connection, but I want to receive
something back from the server before closing the sockets connection.
My logs show that the server never leaves the loop.

Thanks in advance.

[James Mills]

Re: problem with sockets code

On Fri, Oct 3, 2008 at 2:13 AM, Daniel <daniel.watrous @gmail.comwrote :

Hello,
>
I can't seem to get my sockets code to work right. Here is what I
have inside my RequestHandler handle() function:
>
total_data=[]
>
data = True
logger_server.d ebug(self.__cla ss__.__name__ + ' set data =
True')
while data:
logger_server.d ebug(self.__cla ss__.__name__ + ' receive
first readline() of data')
data = self.rfile.read line().strip()
logger_server.d ebug(self.__cla ss__.__name__ + ' first
readline() of data = %s' % data)
total_data.appe nd(data)
receivedCommand = '\n'.join(total _data)
>
And this is what I have inside my client code
>
sock=socket.soc ket(socket.AF_I NET,socket.SOCK _STREAM)
sock.connect((' localhost',5001 ))
>
sock.sendall('H ello, world\r\n')
data = sock.recv(1024)
sock.close()
print 'Received', repr(data)
>
There's a little more to it, but this is enough for me to ask my
question. The problem is that I can't get the server loop (while
data:) to stop without closing the connection, but I want to receive
something back from the server before closing the sockets connection.
My logs show that the server never leaves the loop.
>
Thanks in advance.

Daniel,

You really should use an existing framework to help
you write your application here. You're using the
plain old (standard-library) sockets module.

I would suggest you use either Twisted, or pymills.

Twisted is more feature-rich, and a general purpose
event-driven framework. It can be a little overwhelming
to use.

pymills is my event-driven, component architecture
library that allows you to build event-driven systems
very easily with a component design.

You can download pymills from here:

http://hg.shortcircuit.net.au/index.wsgi/pymills/archive/tip.tar.gz

Or you can get the latest developmen branch by using
Mercurial and cloning it:

hg clone http://hg.shortcircuit.net.au/index.wsgi/pymills/

Here is a simple EchoServer that you could modify
to suit your application needs:

<code>
#!/usr/bin/env python

from pymills import event
from pymills.event import *
from pymills.net.soc kets import TCPServer

class Echo(TCPServer) :

@listener("read ")
def onREAD(self, sock, data):
self.write(sock , data)

def main():
echo = Echo(8000)
event.manager += echo

while True:
try:
manager.flush()
echo.poll()
except KeyboardInterru pt:
break

if __name__ == "__main__":
main()
</code>

cheers
James


--
--
-- "Problems are solved by method"

[Lawrence D'Oliveiro]

Re: problem with sockets code

In message
<f84b1539-f5b2-487c-9c2b-75d05c0911cf@2g 2000hsn.googleg roups.com>, Daniel
wrote:

while data:
...
data = self.rfile.read line().strip()

Interpreting a random string value as a Boolean is a bad idea.

[Roy Smith]

Re: problem with sockets code

In article <gca100$q21$6@l ust.ihug.co.nz> ,
Lawrence D'Oliveiro <ldo@geek-central.gen.new _zealandwrote:

In message
<f84b1539-f5b2-487c-9c2b-75d05c0911cf@2g 2000hsn.googleg roups.com>, Daniel
wrote:
>

while data:
...
data = self.rfile.read line().strip()

>
Interpreting a random string value as a Boolean is a bad idea.

Why?