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# -*- test-case-name: twisted.application.twist.test.test_twist -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Run a Twisted application.
"""
import sys
from typing import Sequence
from twisted.application.app import _exitWithSignal
from twisted.internet.interfaces import IReactorCore, _ISupportsExitSignalCapturing
from twisted.python.usage import Options, UsageError
from ..runner._exit import ExitStatus, exit
from ..runner._runner import Runner
from ..service import Application, IService, IServiceMaker
from ._options import TwistOptions
class Twist:
"""
Run a Twisted application.
"""
@staticmethod
def options(argv: Sequence[str]) -> TwistOptions:
"""
Parse command line options.
@param argv: Command line arguments.
@return: The parsed options.
"""
options = TwistOptions()
try:
options.parseOptions(argv[1:])
except UsageError as e:
exit(ExitStatus.EX_USAGE, f"Error: {e}\n\n{options}")
return options
@staticmethod
def service(plugin: IServiceMaker, options: Options) -> IService:
"""
Create the application service.
@param plugin: The name of the plugin that implements the service
application to run.
@param options: Options to pass to the application.
@return: The created application service.
"""
service = plugin.makeService(options)
application = Application(plugin.tapname)
service.setServiceParent(application)
return IService(application)
@staticmethod
def startService(reactor: IReactorCore, service: IService) -> None:
"""
Start the application service.
@param reactor: The reactor to run the service with.
@param service: The application service to run.
"""
service.startService()
# Ask the reactor to stop the service before shutting down
reactor.addSystemEventTrigger("before", "shutdown", service.stopService)
@staticmethod
def run(twistOptions: TwistOptions) -> None:
"""
Run the application service.
@param twistOptions: Command line options to convert to runner
arguments.
"""
runner = Runner(
reactor=twistOptions["reactor"],
defaultLogLevel=twistOptions["logLevel"],
logFile=twistOptions["logFile"],
fileLogObserverFactory=twistOptions["fileLogObserverFactory"],
)
runner.run()
reactor = twistOptions["reactor"]
if _ISupportsExitSignalCapturing.providedBy(reactor):
if reactor._exitSignal is not None:
_exitWithSignal(reactor._exitSignal)
@classmethod
def main(cls, argv: Sequence[str] = sys.argv) -> None:
"""
Executable entry point for L{Twist}.
Processes options and run a twisted reactor with a service.
@param argv: Command line arguments.
@type argv: L{list}
"""
options = cls.options(argv)
reactor = options["reactor"]
# If subCommand is None, TwistOptions.parseOptions() raises UsageError
# and Twist.options() will exit the runner, so we'll never get here.
subCommand = options.subCommand
assert subCommand is not None
service = cls.service(
plugin=options.plugins[subCommand],
options=options.subOptions,
)
cls.startService(reactor, service)
cls.run(options)
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