glib: Create a new module to deal with all things glib

- Chmod -x dbus.py. It appears that the file was accidentally set to permissions
0o755 instead of 0o644.

glib module will contain:

- Code to deal with glib main loop.

- Use glib as a way to schedule timely events instead of creating long running
  threads.

- Other mechanisms to help with asynchronous I/O until we start using asyncio.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/__main__.py

@@ -21,7 +21,7 @@ import importlib
 import logging
 import sys
 
-from . import (__version__, cfg, dbus, frontpage, log, menu, module_loader,
+from . import (__version__, cfg, frontpage, glib, log, menu, module_loader,
                setup, utils, web_framework, web_server)
 
 if utils.is_axes_old():
@@ -130,7 +130,7 @@ def adapt_config(arguments):
 def on_web_server_stop():
     """Stop all other threads since web server is trying to exit."""
     setup.stop()
-    dbus.stop()
+    glib.stop()
 
 
 def main():
@@ -178,7 +178,7 @@ def main():
 
     setup.run_setup_in_background()
 
-    dbus.run()
+    glib.run()
 
     web_server.init()
     web_server.run(on_web_server_stop)

plinth/dbus.py

@@ -23,16 +23,13 @@ import threading
 
 from plinth.utils import import_from_gi
 
-from . import network, setup
+from . import setup
 
-glib = import_from_gi('GLib', '2.0')
 gio = import_from_gi('Gio', '2.0')
 
 logger = logging.getLogger(__name__)
 
-_thread = None
 _server = None
-_main_loop = None
 
 
 class PackageHandler():
@@ -127,35 +124,8 @@ class DBusServer():
         # service again.
 
 
-def run():
+def init():
-    """Run a glib main loop forever in a thread."""
+    """Connect to D-Bus service. Must be run from glib thread."""
-    global _thread
-    _thread = threading.Thread(target=_run)
-    _thread.start()
-
-
-def stop():
-    """Exit glib main loop and end the thread."""
-    if _main_loop:
-        logger.info('Exiting main loop for D-Bus services')
-        _main_loop.quit()
-
-
-def _run():
-    """Connect to D-Bus and run main loop."""
-    logger.info('Started new thread for D-Bus services')
-
     global _server
     _server = DBusServer()
     _server.connect()
-
-    # Initialize all other modules that glib main loop
-    # XXX: Refactor this code into separate 'glib' module later
-    network.init()
-
-    global _main_loop
-    _main_loop = glib.MainLoop()
-    _main_loop.run()
-    _main_loop = None
-
-    logger.info('D-Bus services thread exited.')

plinth/glib.py

@@ -0,0 +1,59 @@
+#
+# This file is part of FreedomBox.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import logging
+import threading
+
+from plinth import dbus, network
+from plinth.utils import import_from_gi
+
+glib = import_from_gi('GLib', '2.0')
+
+_thread = None
+_main_loop = None
+
+logger = logging.getLogger(__name__)
+
+
+def run():
+    """Run a glib main loop forever in a thread."""
+    global _thread
+    _thread = threading.Thread(target=_run)
+    _thread.start()
+
+
+def stop():
+    """Exit glib main loop and end the thread."""
+    if _main_loop:
+        logger.info('Exiting glib main loop')
+        _main_loop.quit()
+
+
+def _run():
+    """Connect to D-Bus and run main loop."""
+    logger.info('Started new thread for glib main loop.')
+
+    # Initialize all modules that use glib main loop
+    dbus.init()
+    network.init()
+
+    global _main_loop
+    _main_loop = glib.MainLoop()
+    _main_loop.run()
+    _main_loop = None
+
+    logger.info('Glib main loop thread exited.')