sugar-toolkit-gtk3/services/presence/activity.py

# Copyright (C) 2007, Red Hat, Inc.
# Copyright (C) 2007, Collabora Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

import gobject
import dbus, dbus.service
from sugar import util
import logging

from telepathy.interfaces import (CHANNEL_INTERFACE)

_ACTIVITY_PATH = "/org/laptop/Sugar/Presence/Activities/"
_ACTIVITY_INTERFACE = "org.laptop.Sugar.Presence.Activity"

class DBusGObjectMetaclass(dbus.service.InterfaceType, gobject.GObjectMeta): pass
class DBusGObject(dbus.service.Object, gobject.GObject): __metaclass__ = DBusGObjectMetaclass


class Activity(DBusGObject):
    """Represents a potentially shareable activity on the network.
    """
    
    __gtype_name__ = "Activity"

    __gsignals__ = {
        'validity-changed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                            ([gobject.TYPE_BOOLEAN]))
    }

    __gproperties__ = {
        'id'     : (str, None, None, None,
                    gobject.PARAM_READWRITE | gobject.PARAM_CONSTRUCT_ONLY),
        'name'   : (str, None, None, None, gobject.PARAM_READWRITE),
        'color'  : (str, None, None, None, gobject.PARAM_READWRITE),
        'type'   : (str, None, None, None, gobject.PARAM_READWRITE),
        'valid'  : (bool, None, None, False, gobject.PARAM_READABLE),
        'local'  : (bool, None, None, False,
                    gobject.PARAM_READWRITE | gobject.PARAM_CONSTRUCT_ONLY),
        'joined' : (bool, None, None, False, gobject.PARAM_READABLE)
    }

    def __init__(self, bus_name, object_id, tp, **kwargs):
        """Initializes the activity and sets its properties to default values.
        
        bus_name -- DBUS name for lookup on local host
        object_id -- The unique worldwide ID for this activity
        tp -- The server plugin object (stands for "telepathy plugin")
        kwargs -- Keyword arguments for the GObject properties
    
        """
        
        if not bus_name:
            raise ValueError("DBus bus name must be valid")
        if not object_id or not isinstance(object_id, int):
            raise ValueError("object id must be a valid number")
        if not tp:
            raise ValueError("telepathy CM must be valid")

        self._object_id = object_id
        self._object_path = _ACTIVITY_PATH + str(self._object_id)
        dbus.service.Object.__init__(self, bus_name, self._object_path)

        self._buddies = []
        self._joined = False

        # the telepathy client
        self._tp = tp
        self._text_channel = None

        self._valid = False
        self._id = None
        self._color = None
        self._local = False
        self._type = None

        if not kwargs.get("id"):
            raise ValueError("activity id is required")
        if not util.validate_activity_id(kwargs['id']):
            raise ValueError("Invalid activity id '%s'" % kwargs['id'])

        gobject.GObject.__init__(self, **kwargs)
        if self.props.local and not self.props.valid:
            raise RuntimeError("local activities require color, type, and name")

        # If not yet valid, query activity properties
        if not self.props.valid:
            tp.update_activity_properties(self._id)

    def do_get_property(self, pspec):
        """Gets the value of a property associated with this activity.
        
        pspec -- Property specifier

        returns The value of the given property.
        """
        
        if pspec.name == "id":
            return self._id
        elif pspec.name == "name":
            return self._name
        elif pspec.name == "color":
            return self._color
        elif pspec.name == "type":
            return self._type
        elif pspec.name == "valid":
            return self._valid
        elif pspec.name == "joined":
            return self._joined
        elif pspec.name == "local":
            return self._local

    def do_set_property(self, pspec, value):
        """Sets the value of a property associated with this activity.
        
        pspec -- Property specifier
        value -- Desired value

        Note that the "type" property can be set only once; attempting to set it
        to something different later will raise a RuntimeError.
        
        """
        if pspec.name == "id":
            self._id = value
        elif pspec.name == "name":
            self._name = value
        elif pspec.name == "color":
            self._color = value
        elif pspec.name == "type":
            if self._type:
                raise RuntimeError("activity type is already set")
            self._type = value
        elif pspec.name == "joined":
            self._joined = value
        elif pspec.name == "local":
            self._local = value

        self._update_validity()

    def _update_validity(self):
        """Sends a "validity-changed" signal if this activity's validity has changed.
        
        Determines whether this activity's status has changed from valid to
        invalid, or invalid to valid, and emits a "validity-changed" signal
        if either is true.  "Valid" means that the object's type, ID, name,
        colour and type properties have all been set to something valid
        (i.e., not "None").
        
        """
        try:
            old_valid = self._valid
            if self._color and self._name and self._id and self._type:
                self._valid = True
            else:
                self._valid = False

            if old_valid != self._valid:
                self.emit("validity-changed", self._valid)
        except AttributeError:
            self._valid = False

    # dbus signals
    @dbus.service.signal(_ACTIVITY_INTERFACE,
                        signature="o")
    def BuddyJoined(self, buddy_path):
        """Generates DBUS signal when a buddy joins this activity.
        
        buddy_path -- DBUS path to buddy object
        """
        pass

    @dbus.service.signal(_ACTIVITY_INTERFACE,
                        signature="o")
    def BuddyLeft(self, buddy_path):
        """Generates DBUS signal when a buddy leaves this activity.
        
        buddy_path -- DBUS path to buddy object
        """
        pass

    @dbus.service.signal(_ACTIVITY_INTERFACE,
                        signature="o")
    def NewChannel(self, channel_path):
        """Generates DBUS signal when a new channel is created for this activity.
        
        channel_path -- DBUS path to new channel
        
        XXX - what is this supposed to do?  Who is supposed to call it?
        What is the channel path?  Right now this is never called.
        
        """
        pass

    # dbus methods
    @dbus.service.method(_ACTIVITY_INTERFACE,
                        in_signature="", out_signature="s")
    def GetId(self):
        """DBUS method to get this activity's ID
        
        returns Activity ID
        """
        return self.props.id

    @dbus.service.method(_ACTIVITY_INTERFACE,
                        in_signature="", out_signature="s")
    def GetColor(self):
        """DBUS method to get this activity's colour
        
        returns Activity colour
        """
        return self.props.color

    @dbus.service.method(_ACTIVITY_INTERFACE,
                        in_signature="", out_signature="s")
    def GetType(self):
        """DBUS method to get this activity's type
        
        returns Activity type
        """
        return self.props.type

    @dbus.service.method(_ACTIVITY_INTERFACE, in_signature="", out_signature="",
                        async_callbacks=('async_cb', 'async_err_cb'))
    def Join(self, async_cb, async_err_cb):
        """DBUS method to for the local user to attempt to join the activity
        
        async_cb -- Callback method to be called if join attempt is successful
        async_err_cb -- Callback method to be called if join attempt is unsuccessful
        
        """
        self.join(async_cb, async_err_cb)

    @dbus.service.method(_ACTIVITY_INTERFACE,
                        in_signature="", out_signature="ao")
    def GetJoinedBuddies(self):
        """DBUS method to return a list of valid buddies who are joined in this activity
        
        returns A list of buddy object paths
        """
        ret = []
        for buddy in self._buddies:
            if buddy.props.valid:
                ret.append(buddy.object_path())
        return ret

    @dbus.service.method(_ACTIVITY_INTERFACE,
                        in_signature="", out_signature="soao")
    def GetChannels(self):
        """DBUS method to get the list of channels associated with this activity
        
        returns XXX - Not sure what this returns as get_channels doesn't actually return
          a list of channels!
        """
        return self.get_channels()

    @dbus.service.method(_ACTIVITY_INTERFACE,
                        in_signature="", out_signature="s")
    def GetName(self):
        """DBUS method to get this activity's name
        
        returns Activity name
        """
        return self.props.name

    # methods
    def object_path(self):
        """Retrieves our dbus.ObjectPath object
        
        returns DBUS ObjectPath object
        """
        return dbus.ObjectPath(self._object_path)

    def get_joined_buddies(self):
        """Local method to return a list of valid buddies who are joined in this activity
        
        This method is called by the PresenceService on the local machine.
        
        returns A list of buddy objects
        """
        ret = []
        for buddy in self._buddies:
            if buddy.props.valid:
                ret.append(buddy)
        return ret

    def buddy_joined(self, buddy):
        """Adds a buddy to this activity and sends a BuddyJoined signal
        
        buddy -- Buddy object representing the buddy being added
        
        Adds a buddy to this activity if the buddy is not already in the buddy list.
        If this activity is "valid", a BuddyJoined signal is also sent.
        This method is called by the PresenceService on the local machine.
        
        """
        if buddy not in self._buddies:
            self._buddies.append(buddy)
            if self.props.valid:
                self.BuddyJoined(buddy.object_path())

    def buddy_left(self, buddy):
        """Removes a buddy from this activity and sends a BuddyLeft signal.
        
        buddy -- Buddy object representing the buddy being removed
        
        Removes a buddy from this activity if the buddy is in the buddy list.
        If this activity is "valid", a BuddyLeft signal is also sent.
        This method is called by the PresenceService on the local machine.
        
        """
        if buddy in self._buddies:
            self._buddies.remove(buddy)
            if self.props.valid:
                self.BuddyLeft(buddy.object_path())

    def _handle_share_join(self, tp, text_channel):
        """Called when a join to a network activity was successful.
        
        Called by the _shared_cb and _joined_cb methods.
        """
        if not text_channel:
            logging.debug("Error sharing: text channel was None, shouldn't happen")
            raise RuntimeError("Plugin returned invalid text channel")

        self._text_channel = text_channel
        self._text_channel[CHANNEL_INTERFACE].connect_to_signal('Closed',
                self._text_channel_closed_cb)
        self._joined = True
        return True

    def _shared_cb(self, tp, activity_id, text_channel, exc, userdata):
        """XXX - not documented yet
        """
        if activity_id != self.props.id:
            # Not for us
            return

        (sigid, owner, async_cb, async_err_cb) = userdata
        self._tp.disconnect(sigid)

        if exc:
            logging.debug("Share of activity %s failed: %s" % (self._id, exc))
            async_err_cb(exc)
        else:
            self._handle_share_join(tp, text_channel)
            self.send_properties()
            owner.add_activity(self)
            async_cb(dbus.ObjectPath(self._object_path))
            logging.debug("Share of activity %s succeeded." % self._id)

    def _share(self, (async_cb, async_err_cb), owner):
        """XXX - not documented yet
        
        XXX - This method is called externally by the PresenceService despite the fact
        that this is supposed to be an internal method!
        """
        logging.debug("Starting share of activity %s" % self._id)
        if self._joined:
            async_err_cb(RuntimeError("Already shared activity %s" % self.props.id))
            return
        sigid = self._tp.connect('activity-shared', self._shared_cb)
        self._tp.share_activity(self.props.id, (sigid, owner, async_cb, async_err_cb))
        logging.debug("done with share attempt %s" % self._id)

    def _joined_cb(self, tp, activity_id, text_channel, exc, userdata):
        """XXX - not documented yet
        """
        if activity_id != self.props.id:
            # Not for us
            return

        (sigid, async_cb, async_err_cb) = userdata
        self._tp.disconnect(sigid)

        if exc:
            async_err_cb(exc)
        else:
            self._handle_share_join(tp, text_channel)
            async_cb()

    def join(self, async_cb, async_err_cb):
        """Local method for the local user to attempt to join the activity.
        
        async_cb -- Callback method to be called if join attempt is successful
        async_err_cb -- Callback method to be called if join attempt is unsuccessful
        
        The two callbacks are passed to the server_plugin ("tp") object, which in turn
        passes them back as parameters in a callback to the _joined_cb method; this
        callback is set up within this method.
        
        """
        if self._joined:
            async_err_cb(RuntimeError("Already joined activity %s" % self.props.id))
            return
        sigid = self._tp.connect('activity-joined', self._joined_cb)
        self._tp.join_activity(self.props.id, (sigid, async_cb, async_err_cb))

    def get_channels(self):
        """Local method to get the list of channels associated with this activity
        
        returns XXX - expected a list of channels, instead returning a tuple?  ???
        """
        conn = self._tp.get_connection()
        # FIXME add tubes and others channels
        return str(conn.service_name), conn.object_path, [self._text_channel.object_path]

    def leave(self):
        """Local method called when the user wants to leave the activity.
        
        (XXX - doesn't appear to be called anywhere!)
        
        """
        if self._joined:
            self._text_channel[CHANNEL_INTERFACE].Close()

    def _text_channel_closed_cb(self):
        """Callback method called when the text channel is closed.
        
        This callback is set up in the _handle_share_join method.
        """
        self._joined = False
        self._text_channel = None

    def send_properties(self):
        """Tells the Telepathy server what the properties of this activity are.
        
        """
        props = {}
        props['name'] = self._name
        props['color'] = self._color
        props['type'] = self._type
        self._tp.set_activity_properties(self.props.id, props)

    def set_properties(self, properties):
        """Sets name, colour and/or type properties for this activity all at once.
        
        properties - Dictionary object containing properties keyed by property names
        
        Note that if any of the name, colour and/or type property values is changed from
        what it originally was, the update_validity method will be called, resulting in
        a "validity-changed" signal being generated.  (Also note that unlike with the
        do_set_property method, it *is* possible to change an already-set activity type
        to something else; this may be a bug.)  Called by the PresenceService on the
        local machine.
        """
        changed  = False
        if "name" in properties.keys():
            name = properties["name"]
            if name != self._name:
                self._name = name
                changed = True

        if "color" in properties.keys():
            color = properties["color"]
            if color != self._color:
                self._color = color
                changed = True

        if "type" in properties.keys():
            type = properties["type"]
            if type != self._type:
                self._type = type
                changed = True

        if changed:
            self._update_validity()