Python Debugger terminates prematurely when debugging a module

Issue Type: Bug

When I launch my module from the command-line (pthon3 -m labot.mitm.launch), it executes as expected (it's a bot for a game: it stays active in the background and listens to network packets). When I launch it from the debugger (see configuration below), it immediately terminates with the following output:

cd /Users/ldorigo/Dropbox/Documents/Prog/LaBot ; env "PYTHONIOENCODING=UTF-8" "PYTHONUNBUFFERED=1" /usr/local/bin/python3 /Users/ldorigo/.vscode/extensions/ms-python.python-2018.4.0/pythonFiles/PythonTools/visualstudio_py_launcher.py /Users/ldorigo/Dropbox/Documents/Prog/LaBot 49588 34806ad9-833a-4524-8cd6-18ca4aa74f14 RedirectOutput,RedirectOutput -m labot.mitm.launch
[1]    42687 terminated  env "PYTHONIOENCODING=UTF-8" "PYTHONUNBUFFERED=1" /usr/local/bin/python3

I put relevant files below, please let me know if anything else is needed. If you want to try it yourself, the used code is at https://github.com/louisabraham/LaBot , feel free to clone and try it out (although it might take some setting up).

Launch Configuration:

        {
            "name": "Python: mitm",
            "type": "python",
            "request": "launch",
            "module": "labot.mitm.launch"
        },

Relevant files:

labot.mitm.launch:

#!/usr/bin/env python3

from .proxy import startProxyServer
from .proxychains import launchDofus

# to interrupt : httpd.shutdown()
httpd = startProxyServer()

# you can launch several instances
# of dofus with the same httpd
# the bot will be launched after the connexion
dofus = launchDofus()

proxy.py :

from socketserver import ThreadingMixIn
from http.server import HTTPServer, BaseHTTPRequestHandler
import socket
from threading import Thread

from .bridge import Bridge, PrintingMsgBridgeHandler

connection_servers = ['213.248.126.39', '213.248.126.40']

class ThreadingHTTPServer(ThreadingMixIn, HTTPServer):
    debug = False

class ProxyRequestHandler(BaseHTTPRequestHandler):

    def do_CONNECT(self):
        address = self.path.split(':', 1)
        address[1] = int(address[1]) or 443
        try:
            coServ = socket.create_connection(address, timeout=self.timeout)
        except Exception as e:
            self.send_error(502)
            return
        self.send_response(200, 'Connection Established')
        self.end_headers()

        # Here the main function is launched
        Bridge(self.connection, coServ, PrintingMsgBridgeHandler).run()
        # It MUST run in sync mode (not threaded)
        # The bot will run in sync mode and will have a Bridge in async
        # You can use the condition
        # if address[0] not in connection_servers
        # to start your bot only after the connexion

        # VERY IMPORTANT
        self.close_connection = True

    def log_message(self, format, *args):
        """To avoid silly debug messages"""
        if self.server.debug:
            super().log_message(format, *args)

def startProxyServer(port=8000):
    httpd = ThreadingHTTPServer(('localhost', port), ProxyRequestHandler)
    Thread(None, httpd.serve_forever).start()
    return httpd

proxychains.py:

#!/usr/bin/env python3

import sys
import os.path
import os
import subprocess
from ..logs import logger

confpath = os.path.join(os.path.dirname(__file__), 'proxychains.conf')
command = ['proxychains4', '-f', confpath,
           '/Applications/Dofus.app/Contents/Data/Dofus.app/Contents/MacOS/Dofus']
newenv = {**os.environ,
          'DYLD_INSERT_LIBRARIES':
          '/System/Library/Frameworks/OpenGL.framework/Resources/GLEngine.bundle/GLEngine'}

def launchDofus(stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE):
    """to interrupt : dofus.terminate()"""
    return subprocess.Popen(command, env=newenv, stdin=stdin, stdout=stdout, stderr=stderr)

if __name__ == '__main__':
    logger.setLevel('INFO')
    dofus = launchDofus(stdout=sys.stdout, stderr=sys.stderr)

VS Code version: Code 1.23.1 (d0182c3417d225529c6d5ad24b7572815d0de9ac, 2018-05-10T16:03:31.083Z) OS version: Darwin x64 17.5.0

System Info

|Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i7-3720QM CPU @ 2.60GHz (8 x 2600)| |GPU Status|2d_canvas: unavailable_software
flash_3d: enabled
flash_stage3d: enabled
flash_stage3d_baseline: enabled
gpu_compositing: enabled
multiple_raster_threads: enabled_on
native_gpu_memory_buffers: enabled
rasterization: unavailable_software
video_decode: enabled
video_encode: enabled
vpx_decode: enabled
webgl: enabled
webgl2: enabled| |Load (avg)|2, 2, 2| |Memory (System)|16.00GB (0.37GB free)| |Process Argv|/Applications/Visual Studio Code.app/Contents/MacOS/Electron| |Screen Reader|no| |VM|0%|

Extensions (35)

Extension|Author (truncated)|Version ---|---|--- bracket-pair-colorizer|Coe|1.0.50 vscode-markdownlint|Dav|0.17.0 beautify|Hoo|1.3.0 quokka-vscode|Wal|1.0.124 html-css-class-completion|Zig|1.17.1 vscode-color|ans|0.4.5 vscode-nextgenas|bow|0.11.1 mapfile|chi|0.0.1 npm-intellisense|chr|1.3.0 path-intellisense|chr|1.4.2 gitignore|cod|0.5.0 vscode-eslint|dba|1.4.9 githistory|don|0.4.1 gitlens|eam|8.3.1 vscode-npm-script|eg2|0.3.4 json-tools|eri|1.0.2 semantic-data-model-language|fan|0.0.1 flow-for-vscode|flo|0.8.1 code-runner|for|0.9.3 sass-lint|gle|1.0.2 webpack|jer|2.0.2 intellij-idea-keybindings|k--|0.2.23 gitignore|mic|1.0.1 python|ms-|2018.4.0 debugger-for-chrome|msj|4.4.3 vscode-icons|rob|7.23.0 sass-indented|rob|1.4.9 bash-debug|rog|0.2.0 vscode-sass-format|sas|1.1.4 bash-beautify|sha|0.1.1 stylelint|shi|0.36.0 gitconfig|sid|1.0.1 open-in-browser|tec|1.1.0 shellcheck|tim|0.4.0 markdown-all-in-one|yzh|1.3.0

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