"""Shell side object which manages request to start activity""" # Copyright (C) 2006-2007 Red Hat, Inc. # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2 of the License, or (at your option) any later version. # # This library 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 # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the # Free Software Foundation, Inc., 59 Temple Place - Suite 330, # Boston, MA 02111-1307, USA. import logging import subprocess import signal import dbus import gobject from sugar.presence import presenceservice from sugar.activity.activityhandle import ActivityHandle from sugar.activity import registry from sugar import util from sugar import env from errno import EEXIST import os # #3903 - this constant can be removed and assumed to be 1 when dbus-python # 0.82.3 is the only version used if dbus.version >= (0, 82, 3): DBUS_PYTHON_TIMEOUT_UNITS_PER_SECOND = 1 else: DBUS_PYTHON_TIMEOUT_UNITS_PER_SECOND = 1000 _SHELL_SERVICE = "org.laptop.Shell" _SHELL_PATH = "/org/laptop/Shell" _SHELL_IFACE = "org.laptop.Shell" _DS_SERVICE = "org.laptop.sugar.DataStore" _DS_INTERFACE = "org.laptop.sugar.DataStore" _DS_PATH = "/org/laptop/sugar/DataStore" _ACTIVITY_FACTORY_INTERFACE = "org.laptop.ActivityFactory" _RAINBOW_SERVICE_NAME = "org.laptop.security.Rainbow" _RAINBOW_ACTIVITY_FACTORY_PATH = "/" _RAINBOW_ACTIVITY_FACTORY_INTERFACE = "org.laptop.security.Rainbow" _children_pid = [] def _sigchild_handler(signum, frame): for child_pid in _children_pid: pid, status = os.waitpid(child_pid, os.WNOHANG) if pid > 0: _children_pid.remove(pid) signal.signal(signal.SIGCHLD, _sigchild_handler) def create_activity_id(): """Generate a new, unique ID for this activity""" pservice = presenceservice.get_instance() # create a new unique activity ID i = 0 act_id = None while i < 10: act_id = util.unique_id() i += 1 # check through network activities found = False activities = pservice.get_activities() for act in activities: if act_id == act.props.id: found = True break if not found: return act_id raise RuntimeError("Cannot generate unique activity id.") def get_environment(activity): environ = os.environ.copy() bin_path = os.path.join(activity.path, 'bin') activity_root = env.get_profile_path(activity.bundle_id) if not os.path.exists(activity_root): os.mkdir(activity_root) data_dir = os.path.join(activity_root, 'instance') if not os.path.exists(data_dir): os.mkdir(data_dir) data_dir = os.path.join(activity_root, 'data') if not os.path.exists(data_dir): os.mkdir(data_dir) tmp_dir = os.path.join(activity_root, 'tmp') if not os.path.exists(tmp_dir): os.mkdir(tmp_dir) environ['SUGAR_BUNDLE_PATH'] = activity.path environ['SUGAR_BUNDLE_ID'] = activity.bundle_id environ['SUGAR_ACTIVITY_ROOT'] = activity_root environ['PATH'] = bin_path + ':' + environ['PATH'] #environ['RAINBOW_STRACE_LOG'] = '1' return environ def get_command(activity, activity_id=None, object_id=None, uri=None): if not activity_id: activity_id = create_activity_id() command = activity.command.split(' ') command.extend(['-b', activity.bundle_id]) command.extend(['-a', activity_id]) if object_id is not None: command.extend(['-o', object_id]) if uri is not None: command.extend(['-u', uri]) print command return command def open_log_file(activity): i = 1 while True: path = env.get_logs_path('%s-%s.log' % (activity.bundle_id, i)) try: fd = os.open(path, os.O_EXCL | os.O_CREAT \ | os.O_SYNC | os.O_WRONLY, 0644) f = os.fdopen(fd, 'w', 0) return (path, f) except OSError, e: if e.errno == EEXIST: i += 1 else: raise e class ActivityCreationHandler(gobject.GObject): """Sugar-side activity creation interface This object uses a dbus method on the ActivityFactory service to create the new activity. It generates GObject events in response to the success/failure of activity startup using callbacks to the service's create call. """ def __init__(self, service_name, handle): """Initialise the handler service_name -- the service name of the bundle factory activity_handle -- stores the values which are to be passed to the service to uniquely identify the activity to be created and the sharing service that may or may not be connected with it sugar.activity.activityhandle.ActivityHandle instance calls the "create" method on the service for this particular activity type and registers the _reply_handler and _error_handler methods on that call's results. The specific service which creates new instances of this particular type of activity is created during the activity registration process in shell bundle registry which creates service definition files for each registered bundle type. If the file '/etc/olpc-security' exists, then activity launching will be delegated to the prototype 'Rainbow' security service. """ gobject.GObject.__init__(self) self._service_name = service_name self._handle = handle self._use_rainbow = os.path.exists('/etc/olpc-security') if service_name in [ 'org.laptop.JournalActivity', 'org.laptop.Terminal', 'org.laptop.LogViewer', 'org.laptop.Analyze', 'org.laptop.WebActivity' ]: self._use_rainbow = False bus = dbus.SessionBus() bus_object = bus.get_object(_SHELL_SERVICE, _SHELL_PATH) self._shell = dbus.Interface(bus_object, _SHELL_IFACE) if handle.activity_id is not None and \ handle.object_id is None: datastore = dbus.Interface( bus.get_object(_DS_SERVICE, _DS_PATH), _DS_INTERFACE) datastore.find({ 'activity_id': self._handle.activity_id }, [], reply_handler=self._find_object_reply_handler, error_handler=self._find_object_error_handler) else: self._launch_activity() def _launch_activity(self): if self._handle.activity_id != None: self._shell.ActivateActivity(self._handle.activity_id, reply_handler=self._activate_reply_handler, error_handler=self._activate_error_handler) else: self._create_activity() def _create_activity(self): if self._handle.activity_id is None: self._handle.activity_id = create_activity_id() self._shell.NotifyLaunch( self._service_name, self._handle.activity_id, reply_handler=self._no_reply_handler, error_handler=self._notify_launch_error_handler) activity_registry = registry.get_registry() activity = activity_registry.get_activity(self._service_name) if activity: environ = get_environment(activity) (log_path, log_file) = open_log_file(activity) command = get_command(activity, self._handle.activity_id, self._handle.object_id, self._handle.uri) if not self._use_rainbow: p = subprocess.Popen(command, env=environ, cwd=activity.path, stdout=log_file, stderr=log_file) _children_pid.append(p.pid) else: log_file.close() system_bus = dbus.SystemBus() factory = system_bus.get_object(_RAINBOW_SERVICE_NAME, _RAINBOW_ACTIVITY_FACTORY_PATH) factory.CreateActivity( log_path, environ, command, environ['SUGAR_BUNDLE_PATH'], environ['SUGAR_BUNDLE_ID'], timeout=30 * DBUS_PYTHON_TIMEOUT_UNITS_PER_SECOND, reply_handler=self._create_reply_handler, error_handler=self._create_error_handler, dbus_interface=_RAINBOW_ACTIVITY_FACTORY_INTERFACE) def _no_reply_handler(self, *args): pass def _notify_launch_failure_error_handler(self, err): logging.error('Notify launch failure failed %s' % err) def _notify_launch_error_handler(self, err): logging.debug('Notify launch failed %s' % err) def _activate_reply_handler(self, activated): if not activated: self._create_activity() def _activate_error_handler(self, err): logging.error("Activity activation request failed %s" % err) def _create_reply_handler(self): logging.debug("Activity created %s (%s)." % (self._handle.activity_id, self._service_name)) def _create_error_handler(self, err): logging.error("Couldn't create activity %s (%s): %s" % (self._handle.activity_id, self._service_name, err)) self._shell.NotifyLaunchFailure( self._handle.activity_id, reply_handler=self._no_reply_handler, error_handler=self._notify_launch_failure_error_handler) def _find_object_reply_handler(self, jobjects, count): if count > 0: if count > 1: logging.debug("Multiple objects has the same activity_id.") self._handle.object_id = jobjects[0]['uid'] self._create_activity() def _find_object_error_handler(self, err): logging.error("Datastore find failed %s" % err) self._create_activity() def create(service_name, activity_handle=None): """Create a new activity from its name.""" if not activity_handle: activity_handle = ActivityHandle() return ActivityCreationHandler(service_name, activity_handle) def create_with_uri(service_name, uri): """Create a new activity and pass the uri as handle.""" activity_handle = ActivityHandle(uri=uri) return ActivityCreationHandler(service_name, activity_handle) def create_with_object_id(service_name, object_id): """Create a new activity and pass the object id as handle.""" activity_handle = ActivityHandle(object_id=object_id) return ActivityCreationHandler(service_name, activity_handle)