"""Unprivileged XDG startup: wait for Node before opening its ordinary UI."""
import http.client
import os
import time


def wait_for_service(now=time.monotonic, sleep=time.sleep, connection=http.client.HTTPConnection):
    deadline = now() + 180
    while now() < deadline:
        client = connection('127.0.0.1', 8780, timeout=2)
        try:
            client.request('GET', '/')
            response = client.getresponse()
            if response.status == 200:
                return True
        except (OSError, http.client.HTTPException):
            pass
        finally:
            client.close()
        sleep(1)
    return False


if __name__ == '__main__':
    if os.geteuid() == 0:
        raise SystemExit('Run in the normal graphical user session')
    wait_for_service()
    # Gtk.Application retains one window per desktop session. Its ordinary
    # polkit authorization and error handling are unchanged.
    os.execv('/usr/bin/mission-core-node', ['/usr/bin/mission-core-node'])