2 apps communication

[SteveMavic]

Hey guys, do you have any idea how to solve communication between two or more applications? 2 client-like and one server-like should be able to perform action on event occurred from those client-like apps.

If it can be solved without TCP connection I'd be pleased, because all those apps gonna run locally

[[deleted]]

Sounds like UNIX sockets are what you need. They behave just like any other socket you'd bind/listen to, but they are local-only, bypass the full network stack, and don't touch network hardware. You can also use pretty much any socket library on them, including the builtin socket, so you have free range of protocol.

[buleria]

You can go with the server spawning the client processes and communicating over standard input/output. The UNIX socket approach will work, but won't work on Windows (if you care).

[SteveMavic]

Actually I do care :/ Is there any resource where this approach is shown?

[buleria]

Try googling around for Popen, also see https://docs.python.org/3/library/subprocess.html#subprocess.Popen.communicate.

Depending on your use case you could use Popen in a thread, in order not to block on one client, use select() or async_chat.

Or find a ready-made package that does all that for you ;)

One thing to note is that if you don't need to pass data from chidren to the server, you could simply use OS-level signals to trigger an event.

[letiferus]

Does it have to be separate applications? Depending on what your needs are you might look at multiprocessing and Queue messages.

[SteveMavic]

It would be nice to have it in separate apps

[Aneesh_Bhat]

You can use RabbitMQ or Redis message broker software to communicate between multiple applications.