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