How to use a Python script to start and stop a Python script containing "http.server.serveforever",

Question

Background

I have a Python 3 script called server.pythat uses an inline module http.server. The script boils down to the following:

from http.server import HTTPServer
from http.server import BaseHTTPRequestHandler

class MyRequestHandler (BaseHTTPRequestHandler):
    def do_POST(self):
        # Code omitted for brevity

    def do_GET(self):
        # Code omitted for brevity

def start_server():

    # Begin serving
    # -------------
    server = HTTPServer(('', port), MyRequestHandler)
    print("server now running on port {0} ...".format(port))

    server.serve_forever()

# Start the Server
# ----------------
if __name__ == '__main__':
    start_server()

MyRequestHandler handles GET and POST requests, importing modules on the fly, depending on the URI that was used for the request.

The above works fine, however, after creating that script, there was a requirement to be able to remotely update the entire "package" of scripts (that is, the server script, as well as all of the "script modules" that load on the fly and are in subfolders) .

script Python 3 ( updater.py), , , , <20 > script .

, . , , , updater.py script server.py. server.py , , , .

, , , subprocess.Popen, , , Python server.py , , , , trial.py script, :

import sys
import subprocess

def main():
    def start_process():
        proc = subprocess.Popen([sys.executable, 'server.py'])
        print("Started process:")
        print(proc.pid)
        return proc

    def kill_process(the_process):
        print("Killing process:")
        print(the_process.pid)
        the_process.kill()

    process = None

    while True:
        user_input = input("Type something: ")

        if user_input == 'start':
            process = start_process()
        if user_input == 'kill':
            kill_process(process)
        if user_input == 'exit':
            break

if __name__ == '__main__':
    main()

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edit: @Håken Lid , , , , while, script. , while - (, , ).

Answer 1

, - stdio "server.py". , ( ), . , .

import sys
import subprocess
from threading import Thread 
#This could probably be solved with async, but I still
#haven't learned async as well as I know threads

def main():

    def start_process():
        proc = subprocess.Popen([sys.executable, 'server.py'], 
                                stdin=subprocess.PIPE, 
                                stdout=subprocess.PIPE)
        print("Started process:")

        def buf_readerd(proc, inbuf, outbuf):
            while proc.poll() is None:
                outbuf.write(inbuf.readline()) #may need to add a newline.. I'm not sure if readline ends in a \n

        stdoutd = Thread(target=buf_readerd, args=(proc, proc.stdout, sys.stdout), daemon=True)
        stderrd = Thread(target=buf_readerd, args=(proc, proc.stderr, sys.stderr), daemon=True)
        stdoutd.start()
        stderrd.start()
        print("started pipe reader daemons")

        print(proc.pid)
        return proc
# ...

Answer 2

, , . , input() while. script , - . subprocess.poll() input() . <return>, , . kill, , .

, updater.py script, " StackOverflow"!

import sys
import subprocess

def main():
    def start_process():
        proc = subprocess.Popen([sys.executable, 'server.py'])
        print("Started process:")
        print(proc.pid)
        return proc

    def kill_process(the_process):
        print("Killing process:")
        print(the_process.pid)
        the_process.kill()

    user_input = input("Type something: ")

    if user_input == 'start':
        process = start_process()

        while process.poll() is None:
            user_input = input()
            if user_input == 'kill' or user_input == 'exit':
                kill_process(process)

if __name__ == '__main__':
    main()