edit-interactive-svg-server

#!/usr/bin/env python3

import os
import socket
import socketserver
import threading
import http.server
from random import randint

import dbus
import dbus.service
import dbus.mainloop.glib
from gi.repository import GLib

BUS_NAME = 'org.editInteractiveSVG.server'
PORT_FILE = "/etc/editInteractiveSVG/port.conf"
HTML_INDEX = "/usr/share/applications/edit-interactive-svg/index.html"

def rand_port():
    return int("%s%s%s%s" % (
        randint(1, 9),
        randint(0, 9),
        randint(0, 9),
        randint(0, 9)
    ))

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

def get_port(nb_attemps=0):
    if nb_attemps >= 3:
        print("Nb of attemps to launch EditInteractiveSVG exceeded.")
        exit(os.EX_USAGE)
    port = rand_port()
    port_file_exist = False
    if nb_attemps == 0:
        try:
            with open(PORT_FILE, 'r') as f:
                port = int(f.read())
            port_file_exist = True
        except:
            pass
    try:
        s.bind(("127.0.0.1", port))
        s.close()
    except:
        return get_port(nb_attemps + 1)
    if not port_file_exist:
        os.makedirs(os.path.dirname(PORT_FILE), exist_ok=True)
        try:
            with open(PORT_FILE, 'w') as f:
                f.write(str(port))
        except:
            pass
    return port


class Server(dbus.service.Object):
    @dbus.service.method(BUS_NAME, in_signature='', out_signature='s')
    def Url(self):
        return "http://127.0.0.1:%s" % str(self.port)

def dbus_loop(port):
    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
    mainloop = GLib.MainLoop()
    session_bus = dbus.SystemBus()
    name = dbus.service.BusName(BUS_NAME, session_bus)
    o = Server(session_bus, '/Server')
    o.port = port
    mainloop.run()

if __name__ == '__main__':    
    os.chdir(os.path.dirname(HTML_INDEX))
    port = get_port()
    print("Launch EditInteractiveSVG on http://127.0.0.1:%s" % str(port))

    Handler = http.server.SimpleHTTPRequestHandler
    httpd = socketserver.TCPServer(("", port), Handler)
    t = threading.Thread(None, httpd.serve_forever)
    t.daemon = True
    t.start()
    
    dbus_loop(port)

    print(BUS_NAME, port)