Python tcp套接字客户端

Question

I need to have a tcp socket client connected to a server to send data and receive. But this socket must be always on and i cannot open another socket.

I have always some data to send over the time and then later process the answer to the data sent previously.

If i could open many sockets, i think it was more easy. But in my case i have to send everything on the same socket asynchronously.

So the question is, what do you recommend to use within the Python ecosystem? (twisted, tornado, etc) Should i consider node.js or another option?

Answer 1

I highly recommend Twisted for this:

• It comes with out-of-the-box support for many TCP protocols.
• It is easy to maintain a single connection, there is a ReconnectingClientFactory that will deal with disconnections and use exponential backoff, and LoopingCall makes it easy to implement a heartbeat.
• Stateful protocols are also easy to implement and intermingle with complex business logic.
• It's fun.

I have a service that is exactly like the one you mention (single login, stays on all the time, processes data). It's been on for months working like a champ.

Twisted is possibly hard to get your head around, but the tutorials here are a great start. Knowing Twisted will get you far in the long run!

Answer 2

"i have to send everything on the same socket asynchronously"

Add your data to a queue, have a separate thread taking items out of the queue and sending via socket.send()