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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
This module provides support for Twisted to interact with the glib
mainloop via GObject Introspection.
In order to use this support, simply do the following::
from twisted.internet import gireactor
gireactor.install()
If you wish to use a GApplication, register it with the reactor::
from twisted.internet import reactor
reactor.registerGApplication(app)
Then use twisted.internet APIs as usual.
On Python 3, pygobject v3.4 or later is required.
"""
from typing import Union
from gi.repository import GLib
from twisted.internet import _glibbase
from twisted.internet.error import ReactorAlreadyRunning
from twisted.python import runtime
if getattr(GLib, "threads_init", None) is not None:
GLib.threads_init()
class GIReactor(_glibbase.GlibReactorBase):
"""
GObject-introspection event loop reactor.
@ivar _gapplication: A C{Gio.Application} instance that was registered
with C{registerGApplication}.
"""
# By default no Application is registered:
_gapplication = None
def __init__(self, useGtk=False):
_glibbase.GlibReactorBase.__init__(self, GLib, None)
def registerGApplication(self, app):
"""
Register a C{Gio.Application} or C{Gtk.Application}, whose main loop
will be used instead of the default one.
We will C{hold} the application so it doesn't exit on its own. In
versions of C{python-gi} 3.2 and later, we exit the event loop using
the C{app.quit} method which overrides any holds. Older versions are
not supported.
"""
if self._gapplication is not None:
raise RuntimeError("Can't register more than one application instance.")
if self._started:
raise ReactorAlreadyRunning(
"Can't register application after reactor was started."
)
if not hasattr(app, "quit"):
raise RuntimeError(
"Application registration is not supported in"
" versions of PyGObject prior to 3.2."
)
self._gapplication = app
def run():
app.hold()
app.run(None)
self._run = run
self._crash = app.quit
class PortableGIReactor(_glibbase.GlibReactorBase):
"""
Portable GObject Introspection event loop reactor.
"""
def __init__(self, useGtk=False):
super().__init__(GLib, None, useGtk=useGtk)
def registerGApplication(self, app):
"""
Register a C{Gio.Application} or C{Gtk.Application}, whose main loop
will be used instead of the default one.
"""
raise NotImplementedError("GApplication is not currently supported on Windows.")
def simulate(self) -> None:
"""
For compatibility only. Do nothing.
"""
def install(useGtk: bool = False) -> Union[GIReactor, PortableGIReactor]:
"""
Configure the twisted mainloop to be run inside the glib mainloop.
@param useGtk: A hint that the Gtk GUI will or will not be used. Currently
does not modify any behavior.
"""
reactor: Union[GIReactor, PortableGIReactor]
if runtime.platform.getType() == "posix":
reactor = GIReactor(useGtk=useGtk)
else:
reactor = PortableGIReactor(useGtk=useGtk)
from twisted.internet.main import installReactor
installReactor(reactor)
return reactor
__all__ = ["install"]
|
