"""Narrow client: the web app never receives Docker's daemon socket."""
import json
import os
import socket

MANAGED_LABEL='io.athena-deck.managed=true'
ROLE_LABEL='io.athena-deck.role=application'

class DockerSupport:
 def call(self,action,service=None):
  path=os.environ.get('DECK_DOCKER_HELPER_SOCKET','/run/athena-deck-docker/control.sock')
  with socket.socket(socket.AF_UNIX) as sock:
   sock.settimeout(65);sock.connect(path);sock.sendall(json.dumps({'action':action,**({'service':service} if service is not None else {})}).encode()+b'\n')
   with sock.makefile('rb') as stream:raw=stream.readline(1048577)
  if len(raw)>1048576:raise ValueError('Docker-Helferantwort zu groß.')
  value=json.loads(raw)
  if 'error' in value:raise ValueError(value['error'])
  return value
 def status(self):
  try:return dict(self.call('status'),helper_available=True)
  except (OSError,ValueError):return dict(helper_available=False,installed=None,reachable=False,services=[],install_supported=False,job=None,message='Docker-Systemhelfer nicht verbunden. Der Deck-Installer muss ihn auf dem Debian-Host einrichten.',labels=[MANAGED_LABEL,ROLE_LABEL])
 def install(self):return self.call('install')