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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 twisted.python.usage import UsageError
from ..service import Application, IService
from ..runner._exit import exit, ExitStatus
from ..runner._runner import Runner
from ._options import TwistOptions
from twisted.application.app import _exitWithSignal
from twisted.internet.interfaces import _ISupportsExitSignalCapturing
class Twist(object):
"""
Run a Twisted application.
"""
@staticmethod
def options(argv):
"""
Parse command line options.
@param argv: Command line arguments.
@type argv: L{list}
@return: The parsed options.
@rtype: L{TwistOptions}
"""
options = TwistOptions()
try:
options.parseOptions(argv[1:])
except UsageError as e:
exit(ExitStatus.EX_USAGE, "Error: {}\n\n{}".format(e, options))
return options
@staticmethod
def service(plugin, options):
"""
Create the application service.
@param plugin: The name of the plugin that implements the service
application to run.
@type plugin: L{str}
@param options: Options to pass to the application.
@type options: L{twisted.python.usage.Options}
@return: The created application service.
@rtype: L{IService}
"""
service = plugin.makeService(options)
application = Application(plugin.tapname)
service.setServiceParent(application)
return IService(application)
@staticmethod
def startService(reactor, service):
"""
Start the application service.
@param reactor: The reactor to run the service with.
@type reactor: L{twisted.internet.interfaces.IReactorCore}
@param service: The application service to run.
@type service: L{IService}
"""
service.startService()
# Ask the reactor to stop the service before shutting down
reactor.addSystemEventTrigger(
"before", "shutdown", service.stopService
)
@staticmethod
def run(twistOptions):
"""
Run the application service.
@param twistOptions: Command line options to convert to runner
arguments.
@type twistOptions: L{TwistOptions}
"""
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=sys.argv):
"""
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"]
service = cls.service(
plugin=options.plugins[options.subCommand],
options=options.subOptions,
)
cls.startService(reactor, service)
cls.run(options)