diff options
| -rw-r--r-- | synapse/handlers/device.py | 170 |
1 files changed, 123 insertions, 47 deletions
diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py index ca7137f315..e859b3165f 100644 --- a/synapse/handlers/device.py +++ b/synapse/handlers/device.py @@ -16,6 +16,7 @@ from synapse.api import errors from synapse.api.constants import EventTypes from synapse.util import stringutils from synapse.util.async import Linearizer +from synapse.util.caches.expiringcache import ExpiringCache from synapse.util.metrics import measure_func from synapse.types import get_domain_from_id, RoomStreamToken from twisted.internet import defer @@ -34,10 +35,11 @@ class DeviceHandler(BaseHandler): self.state = hs.get_state_handler() self.federation_sender = hs.get_federation_sender() self.federation = hs.get_replication_layer() - self._remote_edue_linearizer = Linearizer(name="remote_device_list") + + self._edu_updater = DeviceListEduUpdater(hs, self) self.federation.register_edu_handler( - "m.device_list_update", self._incoming_device_list_update, + "m.device_list_update", self._edu_updater.incoming_device_list_update, ) self.federation.register_query_handler( "user_devices", self.on_federation_query_user_devices, @@ -299,13 +301,69 @@ class DeviceHandler(BaseHandler): # and those that actually still share a room with the user defer.returnValue(users_who_share_room & possibly_changed) - @measure_func("_incoming_device_list_update") @defer.inlineCallbacks - def _incoming_device_list_update(self, origin, edu_content): - user_id = edu_content["user_id"] - device_id = edu_content["device_id"] - stream_id = edu_content["stream_id"] - prev_ids = edu_content.get("prev_id", []) + def on_federation_query_user_devices(self, user_id): + stream_id, devices = yield self.store.get_devices_with_keys_by_user(user_id) + defer.returnValue({ + "user_id": user_id, + "stream_id": stream_id, + "devices": devices, + }) + + @defer.inlineCallbacks + def user_left_room(self, user, room_id): + user_id = user.to_string() + rooms = yield self.store.get_rooms_for_user(user_id) + if not rooms: + # We no longer share rooms with this user, so we'll no longer + # receive device updates. Mark this in DB. + yield self.store.mark_remote_user_device_list_as_unsubscribed(user_id) + + +def _update_device_from_client_ips(device, client_ips): + ip = client_ips.get((device["user_id"], device["device_id"]), {}) + device.update({ + "last_seen_ts": ip.get("last_seen"), + "last_seen_ip": ip.get("ip"), + }) + + +class DeviceListEduUpdater(object): + "Handles incoming device list updates from federation and updates the DB" + + def __init__(self, hs, device_handler): + self.store = hs.get_datastore() + self.federation = hs.get_replication_layer() + self.clock = hs.get_clock() + self.device_handler = device_handler + + self._remote_edu_linearizer = Linearizer(name="remote_device_list") + + # user_id -> list of updates waiting to be handled. + self._pending_updates = {} + + # Recently seen stream ids. We don't bother keeping these in the DB, + # but they're useful to have them about to reduce the number of spurious + # resyncs. + self._seen_updates = ExpiringCache( + cache_name="device_update_edu", + clock=self.clock, + max_len=10000, + expiry_ms=30 * 60 * 1000, + iterable=True, + ) + + @defer.inlineCallbacks + def incoming_device_list_update(self, origin, edu_content): + """Called on incoming device list update from federation. Responsible + for parsing the EDU and adding to pending updates list. + """ + + user_id = edu_content.pop("user_id") + device_id = edu_content.pop("device_id") + stream_id = str(edu_content.pop("stream_id")) # They may come as ints + prev_ids = edu_content.pop("prev_id", []) + prev_ids = [str(p) for p in prev_ids] # They may come as ints if get_domain_from_id(user_id) != origin: # TODO: Raise? @@ -318,20 +376,28 @@ class DeviceHandler(BaseHandler): # probably won't get any further updates. return - with (yield self._remote_edue_linearizer.queue(user_id)): - # If the prev id matches whats in our cache table, then we don't need - # to resync the users device list, otherwise we do. - resync = True - if len(prev_ids) == 1: - extremity = yield self.store.get_device_list_last_stream_id_for_remote( - user_id - ) - logger.info("Extrem: %r, prev_ids: %r", extremity, prev_ids) - if str(extremity) == str(prev_ids[0]): - resync = False + self._pending_updates.setdefault(user_id, []).append( + (device_id, stream_id, prev_ids, edu_content) + ) + + yield self._handle_device_updates(user_id) + + @measure_func("_incoming_device_list_update") + @defer.inlineCallbacks + def _handle_device_updates(self, user_id): + "Actually handle pending updates." + + with (yield self._remote_edu_linearizer.queue(user_id)): + pending_updates = self._pending_updates.pop(user_id, []) + if not pending_updates: + # This can happen since we batch updates + return + + resync = yield self._need_to_do_resync(user_id, pending_updates) if resync: # Fetch all devices for the user. + origin = get_domain_from_id(user_id) result = yield self.federation.query_user_devices(origin, user_id) stream_id = result["stream_id"] devices = result["devices"] @@ -339,40 +405,50 @@ class DeviceHandler(BaseHandler): user_id, devices, stream_id, ) device_ids = [device["device_id"] for device in devices] - yield self.notify_device_update(user_id, device_ids) + yield self.device_handler.notify_device_update(user_id, device_ids) else: # Simply update the single device, since we know that is the only # change (becuase of the single prev_id matching the current cache) - content = dict(edu_content) - for key in ("user_id", "device_id", "stream_id", "prev_ids"): - content.pop(key, None) - yield self.store.update_remote_device_list_cache_entry( - user_id, device_id, content, stream_id, + for device_id, stream_id, prev_ids, content in pending_updates: + yield self.store.update_remote_device_list_cache_entry( + user_id, device_id, content, stream_id, + ) + + yield self.device_handler.notify_device_update( + user_id, [device_id for device_id, _, _, _ in pending_updates] ) - yield self.notify_device_update(user_id, [device_id]) - @defer.inlineCallbacks - def on_federation_query_user_devices(self, user_id): - stream_id, devices = yield self.store.get_devices_with_keys_by_user(user_id) - defer.returnValue({ - "user_id": user_id, - "stream_id": stream_id, - "devices": devices, - }) + self._seen_updates.setdefault(user_id, set()).update( + stream_id for _, stream_id, _, _ in pending_updates + ) @defer.inlineCallbacks - def user_left_room(self, user, room_id): - user_id = user.to_string() - rooms = yield self.store.get_rooms_for_user(user_id) - if not rooms: - # We no longer share rooms with this user, so we'll no longer - # receive device updates. Mark this in DB. - yield self.store.mark_remote_user_device_list_as_unsubscribed(user_id) + def _need_to_do_resync(self, user_id, updates): + """Given a list of updates for a user figure out if we need to do a full + resync, or whether we have enough data that we can just apply the delta. + """ + seen_updates = self._seen_updates.get(user_id, set()) + extremity = yield self.store.get_device_list_last_stream_id_for_remote( + user_id + ) -def _update_device_from_client_ips(device, client_ips): - ip = client_ips.get((device["user_id"], device["device_id"]), {}) - device.update({ - "last_seen_ts": ip.get("last_seen"), - "last_seen_ip": ip.get("ip"), - }) + stream_id_in_updates = set() # stream_ids in updates list + for _, stream_id, prev_ids, _ in updates: + if not prev_ids: + # We always do a resync if there are no previous IDs + defer.returnValue(True) + + for prev_id in prev_ids: + if prev_id == extremity: + continue + elif prev_id in seen_updates: + continue + elif prev_id in stream_id_in_updates: + continue + else: + defer.returnValue(True) + + stream_id_in_updates.add(stream_id) + + defer.returnValue(False) |