/usr/lib/python2.7/dist-packages/framework/subsystems/ousaged/resources.py is in fso-frameworkd 0.10.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# -*- coding: UTF-8 -*-
"""
Open Usage Daemon - Generic reference counted Resource Management
(C) 2008 Michael 'Mickey' Lauer <mlauer@vanille-media.de>
(C) 2008 Jan 'Shoragan' Lübbe <jluebbe@lasnet.de>
(C) 2008 Openmoko, Inc.
GPLv2 or later
Package: ousaged
Module: resources
"""
MODULE_NAME = "ousaged"
__version__ = "0.6.2"
from framework.config import config
from framework.patterns import tasklet, dbuscache
import gobject
import dbus
import dbus.service
import time, os, subprocess
import logging
logger = logging.getLogger( MODULE_NAME )
#----------------------------------------------------------------------------#
# DBus Exceptions specifications specific to this module
class PolicyUnknown( dbus.DBusException ):
_dbus_error_name = "org.freesmartphone.Usage.PolicyUnknown"
class PolicyDisabled( dbus.DBusException ):
_dbus_error_name = "org.freesmartphone.Usage.PolicyDisabled"
class UserExists( dbus.DBusException ):
_dbus_error_name = "org.freesmartphone.Usage.UserExists"
class UserUnknown( dbus.DBusException ):
_dbus_error_name = "org.freesmartphone.Usage.UserUnknown"
class ResourceInUse( dbus.DBusException ):
_dbus_error_name = "org.freesmartphone.Usage.ResourceInUse"
#----------------------------------------------------------------------------#
class AbstractResource( object ):
#----------------------------------------------------------------------------#
"""
Abstract base class for a resource.
This is the internal class used by the resource manager to keep track of a resource.
Every resource has a name, a list of current users, and a policy.
Valid policies are:
* auto: Reference counted, this is the default,
* disabled: The resource is always off,
* enabled: The resource is always on.
"""
VALID_POLICIES = "disabled auto enabled".split()
def __init__( self, usageControl, name = "Abstract" ):
"""
Create a new resource
`usageControl` : the resource controler object that will handle this resource
`name` : the name of the resource
"""
self.usageControl = usageControl
self.name = str(name)
self.users = []
self.policy = 'auto'
self.isEnabled = False
@tasklet.tasklet
def _enable( self ):
"""
Enable the resource.
"""
yield None
@tasklet.tasklet
def _disable( self ):
"""
Disable the resource.
"""
yield None
@tasklet.tasklet
def _suspend( self ):
"""
Called before the system is going to suspend.
"""
yield None
@tasklet.tasklet
def _resume( self ):
"""
Called after a system resume.
"""
yield None
@tasklet.tasklet
def _update( self ):
if not self.isEnabled and ( self.users or self.policy == 'enabled' ):
logger.debug( "Enabling %s", self.name )
ts = time.time()
yield self._enable()
logger.info( "Enabled %s in %.1f seconds", self.name, time.time()-ts )
self.isEnabled = True
elif self.isEnabled and not ( self.users or self.policy == 'enabled' ):
logger.debug( "Disabling %s", self.name )
ts = time.time()
yield self._disable()
logger.info( "Disabled %s in %.1f seconds", self.name, time.time()-ts )
self.isEnabled = False
@tasklet.tasklet
def setPolicy( self, policy ):
if not policy in AbstractResource.VALID_POLICIES:
raise PolicyUnknown( "Unknown resource policy. Valid policies are %s" % AbstractResource.VALID_POLICIES )
if self.users:
if policy == "disabled":
raise ResourceInUse( "Can't disable %s. Current users are: %s" % ( self.name, self.users ) )
if self.policy != policy:
self.policy = policy
yield self._update()
self.usageControl.ResourceChanged(
self.name, self.isEnabled, { "policy": self.policy, "refcount": len( self.users ) }
)
@tasklet.tasklet
def request( self, user ):
if not self.policy in [ 'auto', 'enabled' ]:
raise PolicyDisabled( "Requesting %s not allowed by resource policy." % ( self.name ) )
if user in self.users:
raise UserExists( "User %s already requested %s" % ( user, self.name ) )
self.users.append( user )
yield self._update()
self.usageControl.ResourceChanged(
self.name, self.isEnabled, {"policy": self.policy, "refcount": len( self.users )}
)
@tasklet.tasklet
def release( self, user ):
if not user in self.users:
raise UserUnknown( "User %s did not request %s before releasing it" % ( user, self.name ) )
self.users.remove( user )
yield self._update()
self.usageControl.ResourceChanged(
self.name, self.isEnabled, {"policy": self.policy, "refcount": len( self.users )}
)
@tasklet.tasklet
def cleanup( self, user ):
if user in self.users:
yield self.release( user )
logger.info( "Releasing %s for vanished user %s", self.name, user )
#----------------------------------------------------------------------------#
class DummyResource( AbstractResource ):
#----------------------------------------------------------------------------#
"""
This is a dummy resource class that does nothing.
"""
def __init__( self, usageControl, name ):
AbstractResource.__init__( self , usageControl, name )
@tasklet.tasklet
def _enable( self ):
yield None
@tasklet.tasklet
def _disable( self ):
yield None
#----------------------------------------------------------------------------#
class ODeviceDResource( AbstractResource ):
#----------------------------------------------------------------------------#
"""
This is a resource class for objects controlled by the odeviced subsystem.
"""
DEPRECATED = True
def __init__( self, usageControl, name ):
AbstractResource.__init__( self , usageControl, name )
self.bus = dbus.SystemBus()
@tasklet.tasklet
def _enable( self ):
proxy = self.bus.get_object( "org.freesmartphone.odeviced", "/org/freesmartphone/Device/PowerControl/" + self.name )
iface = dbus.Interface( proxy, "org.freesmartphone.Device.PowerControl" )
yield tasklet.WaitDBus( iface.SetPower, True)
@tasklet.tasklet
def _disable( self ):
proxy = self.bus.get_object( "org.freesmartphone.odeviced", "/org/freesmartphone/Device/PowerControl/" + self.name )
iface = dbus.Interface( proxy, "org.freesmartphone.Device.PowerControl" )
yield tasklet.WaitDBus( iface.SetPower, False )
#----------------------------------------------------------------------------#
class ClientResource( AbstractResource ):
#----------------------------------------------------------------------------#
"""
A resource controlled by an external client.
The client needs to expose a dbus object implementing org.freesmartphone.Resource.
It can register using the RegisterResource of /org/freesmartphone/Usage.
If the client is written in python, it can use the framework.Resource class.
"""
sync_resources_with_lifecycle = config.getValue( "ousaged", "sync_resources_with_lifecycle", "always" )
def __init__( self, usageControl, name, path, sender ):
"""
Create a new ClientResource
Only the resource manager should call this method
"""
super( ClientResource, self ).__init__( usageControl, name )
self.path = path
self.sender = sender
self.iface = None
if self.sync_resources_with_lifecycle in ( "always", "startup" ):
self._disable().start()
@tasklet.tasklet
def _enable( self ):
"""Simply call the client Enable method"""
if self.iface is None:
self.iface = dbuscache.dbusInterfaceForObjectWithInterface( self.sender, self.path, "org.freesmartphone.Resource" )
yield tasklet.WaitDBus( self.iface.Enable )
@tasklet.tasklet
def _disable( self ):
"""Simply call the client Disable method"""
if self.iface is None:
self.iface = dbuscache.dbusInterfaceForObjectWithInterface( self.sender, self.path, "org.freesmartphone.Resource" )
yield tasklet.WaitDBus( self.iface.Disable )
@tasklet.tasklet
def _suspend( self ):
"""Simply call the client Suspend method"""
if self.iface is None:
self.iface = dbuscache.dbusInterfaceForObjectWithInterface( self.sender, self.path, "org.freesmartphone.Resource" )
yield tasklet.WaitDBus( self.iface.Suspend )
@tasklet.tasklet
def _resume( self ):
"""Simply call the client Resume method"""
if self.iface is None:
self.iface = dbuscache.dbusInterfaceForObjectWithInterface( self.sender, self.path, "org.freesmartphone.Resource" )
yield tasklet.WaitDBus( self.iface.Resume )
#----------------------------------------------------------------------------#
if __name__ == "__main__":
#----------------------------------------------------------------------------#
pass
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