running and stopping a script in subprocess

Question

I am not familiar with subprocesses and I would like to have some help with the following problem. I have 3 apps. Lets say I am running them with command like this:

python manage.py app1
python manage.py app2
python manage.py app2

I want to make a main script to control them like run_app1 or stop_app1

Everything runs in linux.

My apologies for my poor explanation. I have a problem called Dyslexia, also known as reading disorder. It is some times hard for me to write down what I am thinking. Thank you for reading or any help

Answer 1

Using the subprocess Python module a first step could be something like this:

# Master
from multiprocessing.connection import Listener
from subprocess import Popen, PIPE
import socket
import sys

port = 10000
lstn = Listener(('localhost', int(port)), authkey=b'secret')
proc = Popen((sys.executable, 'worker.py', str(port)), stdout=PIPE, stderr=PIPE)

conn = lstn.accept()
conn.send([1, 'Brian', None])
print(proc.stdout.readline())

# Worker
from multiprocessing.connection import Client
import sys

port = int(sys.argv[1])
conn = Client(('localhost', port), authkey=b'secret')

while True:
    try:
        msg = conn.recv()
        print('Received: %s', str(msg))
        sys.stdout.flush()
    except EOFError:
        break

The master process initializes a listener and then opens the worker process. Messages can be sent to the worker via the connection object and stdout and stderr go back to the master process.