I am developing a chat application in twisted in Python. I am using transport.write() to write to the TCP stream.
However, sometimes, I notice that the data received at the client side is combined( concatenated).
Is there any way that, we could clear the buffer or flush the data, so that data is received as it is sent and not buffered?
Thanks
This is basically the same as this FAQ item:
http://twistedmatrix.com/trac/wiki/FrequentlyAskedQuestions#Whyisprotocol.dataReceivedcalledwithonlypartofthedataIcalledtransport.writewith
Related
I want to connect a Tun to a socket so that whatever data is stored in the Tun file will then end up being pushed out to a socket which will receive the data. I am struggling with the higher level conceptual understanding of how I am supposed to connect the socket and the Tun. Does the Tun get a dedicated socket that then communicates with another socket (the receive socket)? Or does the Tun directly communicate with the receive socket? Or am I way off all together? Thanks!
If I am understanding your problem, you should be able to write an application that connects to the tun device and also maintains another network socket. You will need some sort of multiplexing such as epoll or select. But, basically, whenever you see data on the tun interface, you can receive the data into a buffer and then provide this buffer (with the correct number of received octets) to the send call of the other socket. Typically you use such a setup when you insert some custom header or something to e.g., implement a custom VPN solution.
I have used quickfix in c++. I am trying to use the python version.
Documentation seems a little sparse, so I was hoping to get some information regarding the same.
I have an emulator, that assembles a message in various protocols (some fix/ some non fix).
opens a tcp connection to a server and sends these messages over.
I am considering assembling the fix message using quickfix.
I don't want to use the client portion of quickfix, just the part which assembles a fix message.
Can this be done? ie: does the api support getting the raw fix(which can then be sent over tcp connection) from Message format.
Thanks and Regards.
Use the message.ToString() function to serialize the message.
I'm working on a really basic "image streaming" server as a school subject, and I've done most of the work but I'm still stuck on the separation between data and control related sockets:
My structure is : TCPServer (my server, used as control socket) contains a dataSocket (only used to send images and initialized within my TCPServer object, when I receive a certain query)
When I'm sending data (images) through my dataSocket, I still need to see if the client sent a PAUSE or STOP request, but if I use python's self.request.recv(1024) the server awaits a response instead of continuing to send data (which is quite logical).
What should I do to prevent this behavior ? Should I launch my recv(1024) on a separate thread and run it at each loop (and check if I get any relevant data in between two iterations) ?
Twisted should do the trick! It handles asynchronous sockets in Python
I have a server written in Python that basically accepts incoming connection from clients and feeds the data received from them into a subprocess (one instance per connection) which then processes the data and returns the result to the server so that it can send it back to the client.
The problem is that the data is streaming in and I need to be able to execute multiple read/write operations with no EOF in sight. So far, I've been unable to come up with a solution that would enable me to do just that without getting my server program blocked on reading. Any suggestions? Thanks.
You could use select.select (available on Unix and Windows).
while True:
rlist, wlist, xlist = select.select([client, proc.stdout], [], [])
The call to select.select will block until either the client socket or proc.stdout is ready to be read.
rlist holds a subset of [client.stdin, proc.stdout] which is ready to be read.
An example of its usage (though for a different problem) can be found here.
It sounds like you have to establish a UDP server and client.
how do I get the message that more than two messages in the buffer in the TCP / IP connection in python if I use the XML-RPC. I've tried using Cherrypy if the message is received by a normal state if more than one it will not get the message.
About the best answer you will get is to switch framework to twisted. Twisted makes networking laughable because of its simplicity
http://twistedmatrix.com/documents/current/web/howto/xmlrpc.html
Here is a tutorial for xml rpc using twisted.