litecord.pubsub: add FriendDispatcher

- gateway.websocket: subscribe to friends on startup
 - presence: dispatch to friends on dispatch_pres
 - storage: add Storage.get_friend_ids

litecord/dispatcher.py

@@ -4,7 +4,7 @@ from typing import Any
 from logbook import Logger
 
 from .pubsub import GuildDispatcher, MemberDispatcher, \
-    UserDispatcher, ChannelDispatcher
+    UserDispatcher, ChannelDispatcher, FriendDispatcher
 
 log = Logger(__name__)
 
@@ -20,8 +20,7 @@ class EventDispatcher:
             'member': MemberDispatcher(self),
             'channel': ChannelDispatcher(self),
             'user': UserDispatcher(self),
-
-            # TODO: channel, friends
+            'friend': FriendDispatcher(self),
         }
 
     async def action(self, backend_str: str, action: str, key, identifier):

litecord/gateway/websocket.py

@@ -285,8 +285,8 @@ class GatewayWebsocket:
             self.state.user_id
         )
 
-    async def subscribe_guilds(self):
-        """Subscribe to all available guilds and DM channels.
+    async def subscribe_all(self):
+        """Subscribe to all guilds, DM channels, and friends.
 
         Subscribing to channels is already handled
         by GuildDispatcher.sub
@@ -304,6 +304,13 @@ class GatewayWebsocket:
         log.info('subscribing to {} dms', len(dm_ids))
         await self.ext.dispatcher.sub_many('channel', user_id, dm_ids)
 
+        # subscribe to all friends
+        # (their friends will also subscribe back
+        #  when they come online)
+        friend_ids = await self.storage.get_friend_ids(user_id)
+        log.info('subscribing to {} friends', len(friend_ids))
+        await self.ext.dispatcher.sub_many('friend', user_id, friend_ids)
+
     async def update_status(self, status: dict):
         """Update the status of the current websocket connection."""
         if status is None:
@@ -398,7 +405,7 @@ class GatewayWebsocket:
 
         self.ext.state_manager.insert(self.state)
         await self.update_status(presence)
-        await self.subscribe_guilds()
+        await self.subscribe_all()
         await self.dispatch_ready()
 
     async def handle_3(self, payload: Dict[str, Any]):

litecord/presence.py

@@ -96,9 +96,6 @@ class PresenceManager:
         """Dispatch a Presence update to an entire guild."""
         state = dict(new_state)
 
-        if state['status'] == 'invisible':
-            state['status'] = 'offline'
-
         member = await self.storage.get_member_data_one(guild_id, user_id)
 
         game = state['game']
@@ -117,14 +114,33 @@ class PresenceManager:
             }
         )
 
-    async def dispatch_pres(self, user_id: int, state):
-        """Dispatch a new presence to all guilds the user is in."""
-        # TODO: account for sharding
+    async def dispatch_pres(self, user_id: int, state: dict):
+        """Dispatch a new presence to all guilds the user is in.
+
+        Also dispatches the presence to all the users' friends
+        """
+        if state['status'] == 'invisible':
+            state['status'] = 'offline'
+
         guild_ids = await self.storage.get_user_guilds(user_id)
 
         for guild_id in guild_ids:
             await self.dispatch_guild_pres(guild_id, user_id, state)
 
+        # dispatch to all friends that are subscribed to them
+        user = await self.storage.get_user(user_id)
+        game = state['game']
+
+        await self.dispatcher.dispatch(
+            'friend', user_id, 'PRESENCE_UPDATE', {
+                'user': user,
+                'status': state['status'],
+
+                # rich presence stuff
+                'game': game,
+                'activities': [game] if game else []
+            })
+
     async def friend_presences(self, friend_ids: int) -> List[Dict[str, Any]]:
         """Fetch presences for a group of users.
 

litecord/pubsub/__init__.py

@@ -2,6 +2,8 @@ from .guild import GuildDispatcher
 from .member import MemberDispatcher
 from .user import UserDispatcher
 from .channel import ChannelDispatcher
+from .friend import FriendDispatcher
 
 __all__ = ['GuildDispatcher', 'MemberDispatcher',
-           'UserDispatcher', 'ChannelDispatcher']
+           'UserDispatcher', 'ChannelDispatcher',
+           'FriendDispatcher']

litecord/pubsub/friend.py

@@ -0,0 +1,22 @@
+from logbook import Logger
+
+from .dispatcher import DispatcherWithState
+
+log = Logger(__name__)
+
+
+class FriendDispatcher(DispatcherWithState):
+    KEY_TYPE = int
+    VAL_TYPE = int
+
+    async def dispatch(self, user_id: int, event, data):
+        """Dispatch an event to all of a users' friends."""
+        peer_ids = self.state[user_id]
+        dispatched = 0
+
+        for peer_id in peer_ids:
+            dispatched += await self.main_dispatcher.dispatch(
+                'user', peer_id, event, data)
+
+        log.info('dispatched uid={} {!r} to {} states',
+                 user_id, event, dispatched)

litecord/storage.py

@@ -771,6 +771,14 @@ class Storage:
 
         return res
 
+    async def get_friend_ids(self, user_id: int) -> List[int]:
+        """Get all friend IDs for a user."""
+        rels = await self.get_relationships(user_id)
+
+        return [int(r['user']['id'])
+                for r in rels
+                if r['type'] == RelationshipType.FRIEND.value]
+
     async def get_dm(self, dm_id: int, user_id: int = None):
         dm_chan = await self.get_channel(dm_id)