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Implement rejected events (#1426)

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* WIP Event rejection

* Still send back errors for rejected events

Instead, discard them at the federationapi /send layer rather than
re-implementing checks at the clientapi/PerformJoin layer.

* Implement rejected events

Critically, rejected events CAN cause state resolution to happen
as it can merge forks in the DAG. This is fine, _provided_ we
do not add the rejected event when performing state resolution,
which is what this PR does. It also fixes the error handling
when NotAllowed happens, as we were checking too early and needlessly
handling NotAllowed in more than one place.

* Update test to match reality

* Modify InputRoomEvents to no longer return an error

Errors do not serialise across HTTP boundaries in polylith mode,
so instead set fields on the InputRoomEventsResponse. Add `Err()`
function to make the API shape basically the same.

* Remove redundant returns; linting

* Update blacklist
This commit is contained in:
Kegsay 2020-09-16 13:00:52 +01:00 • committed by GitHub
parent ba6c7c4a5c
commit 18231f25b4
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27 changed files with 114 additions and 74 deletions
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12
roomserver/storage/postgres/events_table.go
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@ -65,13 +65,14 @@ CREATE TABLE IF NOT EXISTS roomserver_events (
-- Needed for setting reference hashes when sending new events.
reference_sha256 BYTEA NOT NULL,
-- A list of numeric IDs for events that can authenticate this event.
auth_event_nids BIGINT[] NOT NULL
auth_event_nids BIGINT[] NOT NULL,
is_rejected BOOLEAN NOT NULL DEFAULT FALSE
);
`
const insertEventSQL = "" +
"INSERT INTO roomserver_events (room_nid, event_type_nid, event_state_key_nid, event_id, reference_sha256, auth_event_nids, depth)" +
" VALUES ($1, $2, $3, $4, $5, $6, $7)" +
"INSERT INTO roomserver_events (room_nid, event_type_nid, event_state_key_nid, event_id, reference_sha256, auth_event_nids, depth, is_rejected)" +
" VALUES ($1, $2, $3, $4, $5, $6, $7, $8)" +
" ON CONFLICT ON CONSTRAINT roomserver_event_id_unique" +
" DO NOTHING" +
" RETURNING event_nid, state_snapshot_nid"
@ -88,7 +89,7 @@ const bulkSelectStateEventByIDSQL = "" +
" ORDER BY event_type_nid, event_state_key_nid ASC"
const bulkSelectStateAtEventByIDSQL = "" +
"SELECT event_type_nid, event_state_key_nid, event_nid, state_snapshot_nid FROM roomserver_events" +
"SELECT event_type_nid, event_state_key_nid, event_nid, state_snapshot_nid, is_rejected FROM roomserver_events" +
" WHERE event_id = ANY($1)"
const updateEventStateSQL = "" +
@ -174,12 +175,14 @@ func (s *eventStatements) InsertEvent(
referenceSHA256 []byte,
authEventNIDs []types.EventNID,
depth int64,
isRejected bool,
) (types.EventNID, types.StateSnapshotNID, error) {
var eventNID int64
var stateNID int64
err := s.insertEventStmt.QueryRowContext(
ctx, int64(roomNID), int64(eventTypeNID), int64(eventStateKeyNID),
eventID, referenceSHA256, eventNIDsAsArray(authEventNIDs), depth,
isRejected,
).Scan(&eventNID, &stateNID)
return types.EventNID(eventNID), types.StateSnapshotNID(stateNID), err
}
@ -255,6 +258,7 @@ func (s *eventStatements) BulkSelectStateAtEventByID(
&result.EventStateKeyNID,
&result.EventNID,
&result.BeforeStateSnapshotNID,
&result.IsRejected,
); err != nil {
return nil, err
}