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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.
"""
import gi.pygtkcompat # type: ignore[import]
from gi.repository import GLib # type: ignore[import]
from twisted.internet import _glibbase
from twisted.internet.error import ReactorAlreadyRunning
from twisted.python import runtime
# We require a sufficiently new version of pygobject, so always exists:
_pygtkcompatPresent = True
# Newer version of gi, so we can try to initialize compatibility layer; if
# real pygtk was already imported we'll get ImportError at this point
# rather than segfault, so unconditional import is fine.
gi.pygtkcompat.enable()
# At this point importing gobject will get you gi version, and importing
# e.g. gtk will either fail in non-segfaulty way or use gi version if user
# does gi.pygtkcompat.enable_gtk(). So, no need to prevent imports of
# old school pygtk modules.
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}.
"""
_POLL_DISCONNECTED = (
GLib.IOCondition.HUP | GLib.IOCondition.ERR | GLib.IOCondition.NVAL
)
_POLL_IN = GLib.IOCondition.IN
_POLL_OUT = GLib.IOCondition.OUT
# glib's iochannel sources won't tell us about any events that we haven't
# asked for, even if those events aren't sensible inputs to the poll()
# call.
INFLAGS = _POLL_IN | _POLL_DISCONNECTED
OUTFLAGS = _POLL_OUT | _POLL_DISCONNECTED
# By default no Application is registered:
_gapplication = None
def __init__(self, useGtk=False):
_gtk = None
if useGtk is True:
from gi.repository import Gtk as _gtk
_glibbase.GlibReactorBase.__init__(self, GLib, _gtk, 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.
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.PortableGlibReactorBase):
"""
Portable GObject Introspection event loop reactor.
"""
def __init__(self, useGtk=False):
_gtk = None
if useGtk is True:
from gi.repository import Gtk as _gtk
_glibbase.PortableGlibReactorBase.__init__(self, GLib, _gtk, 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 install(useGtk=False):
"""
Configure the twisted mainloop to be run inside the glib mainloop.
@param useGtk: should GTK+ rather than glib event loop be
used (this will be slightly slower but does support GUI).
"""
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"]
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