diff options
Diffstat (limited to 'synapse/rest/client')
| -rw-r--r-- | synapse/rest/client/v2_alpha/sync.py | 67 |
1 files changed, 65 insertions, 2 deletions
diff --git a/synapse/rest/client/v2_alpha/sync.py b/synapse/rest/client/v2_alpha/sync.py index 272a00bc85..efd8281558 100644 --- a/synapse/rest/client/v2_alpha/sync.py +++ b/synapse/rest/client/v2_alpha/sync.py @@ -20,6 +20,7 @@ from synapse.http.servlet import ( ) from synapse.handlers.sync import SyncConfig from synapse.types import StreamToken +from synapse.events import FrozenEvent from synapse.events.utils import ( serialize_event, format_event_for_client_v2_without_event_id, ) @@ -256,7 +257,13 @@ class SyncRestServlet(RestServlet): :rtype: dict[str, object] """ event_map = {} - state_events = filter.filter_room_state(room.state.values()) + state_dict = room.state + timeline_events = filter.filter_room_timeline(room.timeline.events) + + state_dict = SyncRestServlet._rollback_state_for_timeline( + state_dict, timeline_events) + + state_events = filter.filter_room_state(state_dict.values()) state_event_ids = [] for event in state_events: # TODO(mjark): Respect formatting requirements in the filter. @@ -266,7 +273,6 @@ class SyncRestServlet(RestServlet): ) state_event_ids.append(event.event_id) - timeline_events = filter.filter_room_timeline(room.timeline.events) timeline_event_ids = [] for event in timeline_events: # TODO(mjark): Respect formatting requirements in the filter. @@ -297,6 +303,63 @@ class SyncRestServlet(RestServlet): return result + @staticmethod + def _rollback_state_for_timeline(state, timeline): + """ + Wind the state dictionary backwards, so that it represents the + state at the start of the timeline, rather than at the end. + + :param dict[(str, str), synapse.events.EventBase] state: the + state dictionary. Will be updated to the state before the timeline. + :param list[synapse.events.EventBase] timeline: the event timeline + :return: updated state dictionary + """ + logger.debug("Processing state dict %r; timeline %r", state, + [e.get_dict() for e in timeline]) + + result = state.copy() + + for timeline_event in reversed(timeline): + if not timeline_event.is_state(): + continue + + event_key = (timeline_event.type, timeline_event.state_key) + + logger.debug("Considering %s for removal", event_key) + + state_event = result.get(event_key) + if (state_event is None or + state_event.event_id != timeline_event.event_id): + # the event in the timeline isn't present in the state + # dictionary. + # + # the most likely cause for this is that there was a fork in + # the event graph, and the state is no longer valid. Really, + # the event shouldn't be in the timeline. We're going to ignore + # it for now, however. + logger.warn("Found state event %r in timeline which doesn't " + "match state dictionary", timeline_event) + continue + + prev_event_id = timeline_event.unsigned.get("replaces_state", None) + logger.debug("Replacing %s with %s in state dict", + timeline_event.event_id, prev_event_id) + + if prev_event_id is None: + del result[event_key] + else: + result[event_key] = FrozenEvent({ + "type": timeline_event.type, + "state_key": timeline_event.state_key, + "content": timeline_event.unsigned['prev_content'], + "sender": timeline_event.unsigned['prev_sender'], + "event_id": prev_event_id, + "room_id": timeline_event.room_id, + }) + logger.debug("New value: %r", result.get(event_key)) + + return result + def register_servlets(hs, http_server): SyncRestServlet(hs).register(http_server) |