BotZ/bot_z/zdaemon.py
2019-02-07 12:02:42 +01:00

306 lines
9.0 KiB
Python

# -*- coding: utf-8 -*-
"""Daemon for local execution of commands."""
import functools
import json
import lockfile
import logging
import logging.handlers
import os
import queue
import signal
import sys
import threading
import typing as T
from bot_z.bot_z import Operator
from bot_z.utils import Fifo, PLifo, cmd_marshal, cmd_unmarshal
import daemon
from selenium.webdriver.common.keys import Keys
daemon_format = logging.Formatter("%(levelname)s: [%(name)s] -> %(message)s")
console = logging.StreamHandler(stream=sys.stdout)
console.setFormatter(daemon_format)
console.addFilter(logging.Filter(__name__))
syslog = logging.handlers.SysLogHandler(address="/dev/log")
syslog.setFormatter(daemon_format)
logger = logging.getLogger(__name__)
logger.setLevel(os.environ.get("BOTZ_LOGLEVEL", logging.INFO))
logger.addHandler(console)
logger.addHandler(syslog)
logger.debug("Init at debug")
class StopDaemon(Exception):
"""Auxiliary exception to help stop the program in daemon mode."""
pass
def start_daemon(
name: str,
base_uri: str,
timeout: int = None,
proxy: T.Optional[T.Tuple[str, int]] = None,
headless: bool = True,
debug: bool = False,
) -> Operator:
"""
Spawns the Operator object.
"""
optional_args: T.Dict[str, T.Any] = {}
if timeout is not None:
optional_args["timeout"] = timeout
if proxy is not None:
optional_args["proxy"] = proxy
optional_args["headless"] = headless
optional_args["debug"] = debug
logger.info("Started Operator.")
logger.debug(
"Operator parameters: "
"{base_uri: %s, name: %s, timeout: %s, proxy: %s, headless: %s, debug: %s}",
base_uri,
name,
timeout,
proxy,
headless,
debug,
)
return Operator(base_uri=base_uri, name=name, **optional_args)
def operator_drop(op: Operator) -> None:
"""
Stops the Operator.
"""
logger.debug("Stopping Operator...")
logger.debug("Operator id: %s", id(op))
op.quit()
logger.info("Stopped Operator.")
def operator_reload(op: Operator) -> None:
"""
Reload the Operator using the same object.
"""
op_focus = op.switch_to.active_element
op_focus.send_keys(Keys.CONTROL + "Escape")
op.delete_all_cookies()
logger.info("Operator session cleaned.")
def operator_status(op: Operator, debug: bool = False) -> T.Dict[str, str]:
"""
Get the current operator status.
"""
status = {} # type: T.Dict[str, str]
status["is_logged_in"] = str(op.logged_in)
status["is_checked_in"] = str(op.checked_in)
if debug:
status["interal_state"] = str(dir(op))
logger.info("Status: %s", status)
return status
def operator_login(op: Operator, username: str, password: str, force: bool) -> None:
"""
Instructs the operator to perform login.
"""
logger.debug("Performing login.")
op.login(username, password, force)
logger.info("Login done.")
def operator_logout(op: Operator, force: bool) -> None:
"""
Instructs the operator to perform logout.
"""
logger.debug("Performing logout.")
op.logout(force)
logger.info("Logout done.")
def daemon_process(
fifo_path: str,
working_dir: str,
umask: int,
pidfile: lockfile.FileLock,
base_uri: str,
timeout: int = None,
proxy: T.Optional[T.Tuple[str, int]] = None,
headless: bool = True,
debug: bool = False,
foreground: bool = False,
) -> None:
"""
The daemon function.
"""
if debug:
logger.setLevel(logging.DEBUG)
lifo_path = os.path.join(working_dir, "botz_open_daemons.list")
if os.path.exists(lifo_path):
logger.warning("Lifo (%s) exists. Removing!", lifo_path)
os.remove(lifo_path)
starter = functools.partial(
start_daemon,
base_uri=base_uri,
timeout=timeout,
proxy=proxy,
headless=headless,
debug=debug,
)
def stop_all() -> None:
pass
def reload_all() -> None:
pass
def list_all() -> None:
pass
context = daemon.DaemonContext(
working_directory=working_dir, umask=umask, pidfile=pidfile
)
logger.debug("context defined")
context.signal_map = {
signal.SIGTERM: stop_all,
signal.SIGHUP: "terminate",
signal.SIGUSR1: reload_all,
signal.SIGUSR2: list_all,
}
logger.debug("signal map defined")
cmd_map = {
"start": starter,
"stop": operator_drop,
"reload": operator_reload,
"status": operator_status,
"login": operator_login,
"logout": operator_logout,
}
logger.debug("command map defined")
if foreground:
logger.debug("Started in foreground")
try:
listen_commands(lifo_path, fifo_path, cmd_map)
except KeyboardInterrupt:
logger.info("Process killed!")
finally:
os.remove(lifo_path)
return
with context:
logger.debug("Started in background")
try:
listen_commands(lifo_path, fifo_path, cmd_map)
except StopDaemon:
os.remove(lifo_path)
return
def listen_client(
name: str, chan: queue.Queue, cmd_map: T.Dict[str, T.Callable]
) -> None:
"""
The listen loop for an operator instance.
"""
op = cmd_map["start"](name)
logger.debug("Started operator id: %s", id(op))
while True:
cmd = chan.get()
if cmd["name"] != name:
log.warning("Command sent to the wrong instance: %s\n%s", name, cmd)
continue
if cmd["cmd"] == "start":
logger.error("Alredy started: %s", name)
continue
if cmd["cmd"] == "stop":
logger.debug("Received command: stop")
cmd_map["stop"](op)
return
elif cmd["cmd"] == "reload":
logger.debug("Received command: reload")
cmd_map["reload"](op)
elif cmd["cmd"] == "status":
logger.debug("Received command: status")
status = cmd_map["status"](op)
logger.debug("Status: %s", status)
with Fifo(cmd["rfifo_path"], "w") as rfifo:
rfifo.write(cmd_marshal(name=cmd["name"], cmd=status))
elif cmd["cmd"] == "login":
logger.debug("Received command: login")
cmd_map["login"](op, cmd["username"], cmd["password"], cmd["force"])
elif cmd["cmd"] == "logout":
logger.debug("Received command: logout")
cmd_map["logout"](op, cmd["force"])
def listen_commands(
lifopath: str, fifopath: str, cmd_map: T.Dict[str, T.Callable]
) -> None:
"""
The main loop to listen incoming commands.
"""
client_chans = {}
while True:
with Fifo(fifopath) as fifo:
for cmd_str in fifo:
logger.debug("Command received in main loop: %s", cmd_str)
cmd = cmd_unmarshal(cmd_str)
logger.debug("Cmd unmarshalled: %s", cmd)
if cmd["cmd"] == "start":
if cmd["name"] not in client_chans:
client_chans[cmd["name"]] = queue.Queue(1)
logger.debug('Queue created for "%s".', cmd["name"])
if cmd["name"] in PLifo.All(lifopath):
logger.warning("Name %s is yet used. Not proceeding.", name)
continue
logger.debug(
'"%s" being pushed onto "%s"...', cmd["name"], lifopath
)
PLifo.Push(lifopath, cmd["name"])
logger.debug("Client %s has been newly created.", cmd["name"])
chan = client_chans.get(cmd["name"], None)
logger.debug("Starting new client in a thread...")
client = threading.Thread(
name=cmd["name"],
target=functools.partial(
listen_client, name=cmd["name"], chan=chan, cmd_map=cmd_map
),
)
client.start()
logger.debug('Client "%s" started.', cmd["name"])
continue
if cmd["cmd"] == "stop-daemon":
stop_all(client_chans)
logger.info("Daemon clients stopped. Exiting...")
raise StopDaemon
logger.debug("Opening client: %s", cmd["name"])
chan = client_chans.get(cmd["name"], None)
if chan is None:
logger.warning(
'No client found with name "%s". Skipping.', cmd["name"]
)
continue
chan.put(cmd)
def stop_all(client_chans: T.Dict[str, queue.Queue]) -> None:
"""
Send the stop command to all the clients.
"""
for name, chan in client_chans.items():
logger.debug('Stopping "%s"...', name)
chan.put({"name": name, "cmd": "stop"})
logger.info("Stopped %s.", name)