mirror of
https://github.com/1f349/dendrite.git
synced 2024-11-12 23:01:40 +00:00
c62ac3d6ad
The problem was that we weren't getting enough recent events, as most of them were removed by the history visibility filter. Now we're getting all events between the given input range and re-slice the returned values after applying history visibility.
643 lines
22 KiB
Go
643 lines
22 KiB
Go
package streams
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import (
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"context"
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"database/sql"
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"fmt"
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"sort"
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"time"
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"github.com/matrix-org/dendrite/internal/caching"
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roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/syncapi/internal"
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"github.com/matrix-org/dendrite/syncapi/storage"
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"github.com/matrix-org/dendrite/syncapi/types"
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userapi "github.com/matrix-org/dendrite/userapi/api"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/sirupsen/logrus"
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"github.com/tidwall/gjson"
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"github.com/matrix-org/dendrite/syncapi/notifier"
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)
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// The max number of per-room goroutines to have running.
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// Too high and this will consume lots of CPU, too low and complete
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// sync responses will take longer to process.
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const PDU_STREAM_WORKERS = 256
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// The maximum number of tasks that can be queued in total before
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// backpressure will build up and the rests will start to block.
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const PDU_STREAM_QUEUESIZE = PDU_STREAM_WORKERS * 8
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type PDUStreamProvider struct {
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DefaultStreamProvider
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// userID+deviceID -> lazy loading cache
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lazyLoadCache caching.LazyLoadCache
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rsAPI roomserverAPI.SyncRoomserverAPI
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notifier *notifier.Notifier
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}
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func (p *PDUStreamProvider) Setup(
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ctx context.Context, snapshot storage.DatabaseTransaction,
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) {
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p.DefaultStreamProvider.Setup(ctx, snapshot)
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p.latestMutex.Lock()
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defer p.latestMutex.Unlock()
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id, err := snapshot.MaxStreamPositionForPDUs(ctx)
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if err != nil {
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panic(err)
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}
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p.latest = id
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}
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func (p *PDUStreamProvider) CompleteSync(
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ctx context.Context,
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snapshot storage.DatabaseTransaction,
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req *types.SyncRequest,
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) types.StreamPosition {
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from := types.StreamPosition(0)
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to := p.LatestPosition(ctx)
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// Get the current sync position which we will base the sync response on.
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// For complete syncs, we want to start at the most recent events and work
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// backwards, so that we show the most recent events in the room.
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r := types.Range{
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From: to,
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To: 0,
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Backwards: true,
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}
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// Extract room state and recent events for all rooms the user is joined to.
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joinedRoomIDs, err := snapshot.RoomIDsWithMembership(ctx, req.Device.UserID, gomatrixserverlib.Join)
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if err != nil {
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req.Log.WithError(err).Error("p.DB.RoomIDsWithMembership failed")
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return from
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}
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stateFilter := req.Filter.Room.State
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eventFilter := req.Filter.Room.Timeline
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if err = p.addIgnoredUsersToFilter(ctx, snapshot, req, &eventFilter); err != nil {
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req.Log.WithError(err).Error("unable to update event filter with ignored users")
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}
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// Invalidate the lazyLoadCache, otherwise we end up with missing displaynames/avatars
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// TODO: This might be inefficient, when joined to many and/or large rooms.
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for _, roomID := range joinedRoomIDs {
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joinedUsers := p.notifier.JoinedUsers(roomID)
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for _, sharedUser := range joinedUsers {
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p.lazyLoadCache.InvalidateLazyLoadedUser(req.Device, roomID, sharedUser)
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}
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}
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// Build up a /sync response. Add joined rooms.
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for _, roomID := range joinedRoomIDs {
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jr, jerr := p.getJoinResponseForCompleteSync(
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ctx, snapshot, roomID, r, &stateFilter, &eventFilter, req.WantFullState, req.Device, false,
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)
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if jerr != nil {
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req.Log.WithError(jerr).Error("p.getJoinResponseForCompleteSync failed")
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if err == context.DeadlineExceeded || err == context.Canceled || err == sql.ErrTxDone {
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return from
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}
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continue
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}
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req.Response.Rooms.Join[roomID] = jr
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req.Rooms[roomID] = gomatrixserverlib.Join
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}
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// Add peeked rooms.
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peeks, err := snapshot.PeeksInRange(ctx, req.Device.UserID, req.Device.ID, r)
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if err != nil {
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req.Log.WithError(err).Error("p.DB.PeeksInRange failed")
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return from
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}
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for _, peek := range peeks {
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if !peek.Deleted {
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var jr *types.JoinResponse
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jr, err = p.getJoinResponseForCompleteSync(
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ctx, snapshot, peek.RoomID, r, &stateFilter, &eventFilter, req.WantFullState, req.Device, true,
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)
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if err != nil {
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req.Log.WithError(err).Error("p.getJoinResponseForCompleteSync failed")
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if err == context.DeadlineExceeded || err == context.Canceled || err == sql.ErrTxDone {
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return from
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}
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continue
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}
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req.Response.Rooms.Peek[peek.RoomID] = jr
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}
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}
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return to
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}
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func (p *PDUStreamProvider) IncrementalSync(
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ctx context.Context,
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snapshot storage.DatabaseTransaction,
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req *types.SyncRequest,
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from, to types.StreamPosition,
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) (newPos types.StreamPosition) {
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r := types.Range{
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From: from,
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To: to,
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Backwards: from > to,
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}
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var err error
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var stateDeltas []types.StateDelta
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var syncJoinedRooms []string
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stateFilter := req.Filter.Room.State
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eventFilter := req.Filter.Room.Timeline
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if req.WantFullState {
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if stateDeltas, syncJoinedRooms, err = snapshot.GetStateDeltasForFullStateSync(ctx, req.Device, r, req.Device.UserID, &stateFilter); err != nil {
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req.Log.WithError(err).Error("p.DB.GetStateDeltasForFullStateSync failed")
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return from
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}
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} else {
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if stateDeltas, syncJoinedRooms, err = snapshot.GetStateDeltas(ctx, req.Device, r, req.Device.UserID, &stateFilter); err != nil {
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req.Log.WithError(err).Error("p.DB.GetStateDeltas failed")
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return from
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}
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}
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for _, roomID := range syncJoinedRooms {
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req.Rooms[roomID] = gomatrixserverlib.Join
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}
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if len(stateDeltas) == 0 {
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return to
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}
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if err = p.addIgnoredUsersToFilter(ctx, snapshot, req, &eventFilter); err != nil {
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req.Log.WithError(err).Error("unable to update event filter with ignored users")
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}
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newPos = from
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for _, delta := range stateDeltas {
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newRange := r
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// If this room was joined in this sync, try to fetch
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// as much timeline events as allowed by the filter.
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if delta.NewlyJoined {
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// Reverse the range, so we get the most recent first.
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// This will be limited by the eventFilter.
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newRange = types.Range{
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From: r.To,
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To: 0,
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Backwards: true,
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}
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}
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var pos types.StreamPosition
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if pos, err = p.addRoomDeltaToResponse(ctx, snapshot, req.Device, newRange, delta, &eventFilter, &stateFilter, req); err != nil {
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req.Log.WithError(err).Error("d.addRoomDeltaToResponse failed")
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if err == context.DeadlineExceeded || err == context.Canceled || err == sql.ErrTxDone {
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return newPos
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}
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continue
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}
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// Reset the position, as it is only for the special case of newly joined rooms
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if delta.NewlyJoined {
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pos = newRange.From
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}
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switch {
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case r.Backwards && pos < newPos:
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fallthrough
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case !r.Backwards && pos > newPos:
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newPos = pos
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}
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}
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return newPos
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}
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// nolint:gocyclo
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func (p *PDUStreamProvider) addRoomDeltaToResponse(
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ctx context.Context,
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snapshot storage.DatabaseTransaction,
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device *userapi.Device,
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r types.Range,
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delta types.StateDelta,
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eventFilter *gomatrixserverlib.RoomEventFilter,
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stateFilter *gomatrixserverlib.StateFilter,
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req *types.SyncRequest,
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) (types.StreamPosition, error) {
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originalLimit := eventFilter.Limit
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if r.Backwards {
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eventFilter.Limit = int(r.From - r.To)
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}
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recentStreamEvents, limited, err := snapshot.RecentEvents(
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ctx, delta.RoomID, r,
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eventFilter, true, true,
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)
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if err != nil {
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if err == sql.ErrNoRows {
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return r.To, nil
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}
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return r.From, fmt.Errorf("p.DB.RecentEvents: %w", err)
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}
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recentEvents := snapshot.StreamEventsToEvents(device, recentStreamEvents)
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delta.StateEvents = removeDuplicates(delta.StateEvents, recentEvents) // roll back
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prevBatch, err := snapshot.GetBackwardTopologyPos(ctx, recentStreamEvents)
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if err != nil {
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return r.From, fmt.Errorf("p.DB.GetBackwardTopologyPos: %w", err)
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}
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// If we didn't return any events at all then don't bother doing anything else.
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if len(recentEvents) == 0 && len(delta.StateEvents) == 0 {
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return r.To, nil
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}
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// Sort the events so that we can pick out the latest events from both sections.
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recentEvents = gomatrixserverlib.HeaderedReverseTopologicalOrdering(recentEvents, gomatrixserverlib.TopologicalOrderByPrevEvents)
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delta.StateEvents = gomatrixserverlib.HeaderedReverseTopologicalOrdering(delta.StateEvents, gomatrixserverlib.TopologicalOrderByAuthEvents)
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// Work out what the highest stream position is for all of the events in this
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// room that were returned.
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latestPosition := r.To
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updateLatestPosition := func(mostRecentEventID string) {
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var pos types.StreamPosition
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if _, pos, err = snapshot.PositionInTopology(ctx, mostRecentEventID); err == nil {
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switch {
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case r.Backwards && pos < latestPosition:
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fallthrough
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case !r.Backwards && pos > latestPosition:
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latestPosition = pos
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}
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}
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}
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if stateFilter.LazyLoadMembers {
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delta.StateEvents, err = p.lazyLoadMembers(
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ctx, snapshot, delta.RoomID, true, limited, stateFilter,
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device, recentEvents, delta.StateEvents,
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)
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if err != nil && err != sql.ErrNoRows {
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return r.From, fmt.Errorf("p.lazyLoadMembers: %w", err)
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}
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}
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hasMembershipChange := false
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for _, recentEvent := range recentStreamEvents {
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if recentEvent.Type() == gomatrixserverlib.MRoomMember && recentEvent.StateKey() != nil {
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if membership, _ := recentEvent.Membership(); membership == gomatrixserverlib.Join {
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req.MembershipChanges[*recentEvent.StateKey()] = struct{}{}
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}
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hasMembershipChange = true
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}
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}
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// Applies the history visibility rules
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events, err := applyHistoryVisibilityFilter(ctx, snapshot, p.rsAPI, delta.RoomID, device.UserID, eventFilter.Limit, recentEvents)
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if err != nil {
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logrus.WithError(err).Error("unable to apply history visibility filter")
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}
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if r.Backwards && len(events) > originalLimit {
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// We're going backwards and the events are ordered chronologically, so take the last `limit` events
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events = events[len(events)-originalLimit:]
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limited = true
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}
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if len(delta.StateEvents) > 0 {
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updateLatestPosition(delta.StateEvents[len(delta.StateEvents)-1].EventID())
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}
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if len(events) > 0 {
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updateLatestPosition(events[len(events)-1].EventID())
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}
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switch delta.Membership {
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case gomatrixserverlib.Join:
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jr := types.NewJoinResponse()
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if hasMembershipChange {
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p.addRoomSummary(ctx, snapshot, jr, delta.RoomID, device.UserID, latestPosition)
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}
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jr.Timeline.PrevBatch = &prevBatch
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jr.Timeline.Events = gomatrixserverlib.HeaderedToClientEvents(events, gomatrixserverlib.FormatSync)
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// If we are limited by the filter AND the history visibility filter
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// didn't "remove" events, return that the response is limited.
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jr.Timeline.Limited = (limited && len(events) == len(recentEvents)) || delta.NewlyJoined
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jr.State.Events = gomatrixserverlib.HeaderedToClientEvents(delta.StateEvents, gomatrixserverlib.FormatSync)
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req.Response.Rooms.Join[delta.RoomID] = jr
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case gomatrixserverlib.Peek:
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jr := types.NewJoinResponse()
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jr.Timeline.PrevBatch = &prevBatch
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// TODO: Apply history visibility on peeked rooms
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jr.Timeline.Events = gomatrixserverlib.HeaderedToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
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jr.Timeline.Limited = limited
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jr.State.Events = gomatrixserverlib.HeaderedToClientEvents(delta.StateEvents, gomatrixserverlib.FormatSync)
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req.Response.Rooms.Peek[delta.RoomID] = jr
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case gomatrixserverlib.Leave:
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fallthrough // transitions to leave are the same as ban
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case gomatrixserverlib.Ban:
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lr := types.NewLeaveResponse()
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lr.Timeline.PrevBatch = &prevBatch
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lr.Timeline.Events = gomatrixserverlib.HeaderedToClientEvents(events, gomatrixserverlib.FormatSync)
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// If we are limited by the filter AND the history visibility filter
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// didn't "remove" events, return that the response is limited.
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lr.Timeline.Limited = limited && len(events) == len(recentEvents)
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lr.State.Events = gomatrixserverlib.HeaderedToClientEvents(delta.StateEvents, gomatrixserverlib.FormatSync)
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req.Response.Rooms.Leave[delta.RoomID] = lr
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}
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return latestPosition, nil
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}
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// applyHistoryVisibilityFilter gets the current room state and supplies it to ApplyHistoryVisibilityFilter, to make
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// sure we always return the required events in the timeline.
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func applyHistoryVisibilityFilter(
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ctx context.Context,
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snapshot storage.DatabaseTransaction,
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rsAPI roomserverAPI.SyncRoomserverAPI,
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roomID, userID string,
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limit int,
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recentEvents []*gomatrixserverlib.HeaderedEvent,
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) ([]*gomatrixserverlib.HeaderedEvent, error) {
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// We need to make sure we always include the latest states events, if they are in the timeline.
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// We grep at least limit * 2 events, to ensure we really get the needed events.
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stateEvents, err := snapshot.CurrentState(ctx, roomID, &gomatrixserverlib.StateFilter{Limit: limit * 2}, nil)
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if err != nil {
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// Not a fatal error, we can continue without the stateEvents,
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// they are only needed if there are state events in the timeline.
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logrus.WithError(err).Warnf("Failed to get current room state for history visibility")
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}
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alwaysIncludeIDs := make(map[string]struct{}, len(stateEvents))
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for _, ev := range stateEvents {
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alwaysIncludeIDs[ev.EventID()] = struct{}{}
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}
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startTime := time.Now()
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events, err := internal.ApplyHistoryVisibilityFilter(ctx, snapshot, rsAPI, recentEvents, alwaysIncludeIDs, userID, "sync")
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if err != nil {
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return nil, err
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}
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logrus.WithFields(logrus.Fields{
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"duration": time.Since(startTime),
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"room_id": roomID,
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"before": len(recentEvents),
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"after": len(events),
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}).Trace("Applied history visibility (sync)")
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return events, nil
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}
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func (p *PDUStreamProvider) addRoomSummary(ctx context.Context, snapshot storage.DatabaseTransaction, jr *types.JoinResponse, roomID, userID string, latestPosition types.StreamPosition) {
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// Work out how many members are in the room.
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joinedCount, _ := snapshot.MembershipCount(ctx, roomID, gomatrixserverlib.Join, latestPosition)
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invitedCount, _ := snapshot.MembershipCount(ctx, roomID, gomatrixserverlib.Invite, latestPosition)
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jr.Summary.JoinedMemberCount = &joinedCount
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jr.Summary.InvitedMemberCount = &invitedCount
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fetchStates := []gomatrixserverlib.StateKeyTuple{
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{EventType: gomatrixserverlib.MRoomName},
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{EventType: gomatrixserverlib.MRoomCanonicalAlias},
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}
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// Check if the room has a name or a canonical alias
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latestState := &roomserverAPI.QueryLatestEventsAndStateResponse{}
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err := p.rsAPI.QueryLatestEventsAndState(ctx, &roomserverAPI.QueryLatestEventsAndStateRequest{StateToFetch: fetchStates, RoomID: roomID}, latestState)
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if err != nil {
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return
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}
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// Check if the room has a name or canonical alias, if so, return.
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for _, ev := range latestState.StateEvents {
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switch ev.Type() {
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case gomatrixserverlib.MRoomName:
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if gjson.GetBytes(ev.Content(), "name").Str != "" {
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return
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}
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case gomatrixserverlib.MRoomCanonicalAlias:
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if gjson.GetBytes(ev.Content(), "alias").Str != "" {
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return
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}
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}
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}
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heroes, err := snapshot.GetRoomHeroes(ctx, roomID, userID, []string{"join", "invite"})
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if err != nil {
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return
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}
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sort.Strings(heroes)
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jr.Summary.Heroes = heroes
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}
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func (p *PDUStreamProvider) getJoinResponseForCompleteSync(
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ctx context.Context,
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snapshot storage.DatabaseTransaction,
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roomID string,
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r types.Range,
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stateFilter *gomatrixserverlib.StateFilter,
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eventFilter *gomatrixserverlib.RoomEventFilter,
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wantFullState bool,
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device *userapi.Device,
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isPeek bool,
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) (jr *types.JoinResponse, err error) {
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jr = types.NewJoinResponse()
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// TODO: When filters are added, we may need to call this multiple times to get enough events.
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// See: https://github.com/matrix-org/synapse/blob/v0.19.3/synapse/handlers/sync.py#L316
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recentStreamEvents, limited, err := snapshot.RecentEvents(
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ctx, roomID, r, eventFilter, true, true,
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)
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if err != nil {
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if err == sql.ErrNoRows {
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return jr, nil
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}
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return
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}
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// Work our way through the timeline events and pick out the event IDs
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// of any state events that appear in the timeline. We'll specifically
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// exclude them at the next step, so that we don't get duplicate state
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// events in both `recentStreamEvents` and `stateEvents`.
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var excludingEventIDs []string
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if !wantFullState {
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excludingEventIDs = make([]string, 0, len(recentStreamEvents))
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for _, event := range recentStreamEvents {
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if event.StateKey() != nil {
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excludingEventIDs = append(excludingEventIDs, event.EventID())
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}
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}
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}
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stateEvents, err := snapshot.CurrentState(ctx, roomID, stateFilter, excludingEventIDs)
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if err != nil {
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return
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}
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// Retrieve the backward topology position, i.e. the position of the
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|
// oldest event in the room's topology.
|
|
var prevBatch *types.TopologyToken
|
|
if len(recentStreamEvents) > 0 {
|
|
var backwardTopologyPos, backwardStreamPos types.StreamPosition
|
|
event := recentStreamEvents[0]
|
|
// If this is the beginning of the room, we can't go back further. We're going to return
|
|
// the TopologyToken from the last event instead. (Synapse returns the /sync next_Batch)
|
|
if event.Type() == gomatrixserverlib.MRoomCreate && event.StateKeyEquals("") {
|
|
event = recentStreamEvents[len(recentStreamEvents)-1]
|
|
}
|
|
backwardTopologyPos, backwardStreamPos, err = snapshot.PositionInTopology(ctx, event.EventID())
|
|
if err != nil {
|
|
return
|
|
}
|
|
prevBatch = &types.TopologyToken{
|
|
Depth: backwardTopologyPos,
|
|
PDUPosition: backwardStreamPos,
|
|
}
|
|
prevBatch.Decrement()
|
|
}
|
|
|
|
p.addRoomSummary(ctx, snapshot, jr, roomID, device.UserID, r.From)
|
|
|
|
// We don't include a device here as we don't need to send down
|
|
// transaction IDs for complete syncs, but we do it anyway because Sytest demands it for:
|
|
// "Can sync a room with a message with a transaction id" - which does a complete sync to check.
|
|
recentEvents := snapshot.StreamEventsToEvents(device, recentStreamEvents)
|
|
stateEvents = removeDuplicates(stateEvents, recentEvents)
|
|
|
|
events := recentEvents
|
|
// Only apply history visibility checks if the response is for joined rooms
|
|
if !isPeek {
|
|
events, err = applyHistoryVisibilityFilter(ctx, snapshot, p.rsAPI, roomID, device.UserID, eventFilter.Limit, recentEvents)
|
|
if err != nil {
|
|
logrus.WithError(err).Error("unable to apply history visibility filter")
|
|
}
|
|
}
|
|
|
|
// If we are limited by the filter AND the history visibility filter
|
|
// didn't "remove" events, return that the response is limited.
|
|
limited = limited && len(events) == len(recentEvents)
|
|
|
|
if stateFilter.LazyLoadMembers {
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
stateEvents, err = p.lazyLoadMembers(
|
|
ctx, snapshot, roomID,
|
|
false, limited, stateFilter,
|
|
device, recentEvents, stateEvents,
|
|
)
|
|
if err != nil && err != sql.ErrNoRows {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
jr.Timeline.PrevBatch = prevBatch
|
|
jr.Timeline.Events = gomatrixserverlib.HeaderedToClientEvents(events, gomatrixserverlib.FormatSync)
|
|
// If we are limited by the filter AND the history visibility filter
|
|
// didn't "remove" events, return that the response is limited.
|
|
jr.Timeline.Limited = limited && len(events) == len(recentEvents)
|
|
jr.State.Events = gomatrixserverlib.HeaderedToClientEvents(stateEvents, gomatrixserverlib.FormatSync)
|
|
return jr, nil
|
|
}
|
|
|
|
func (p *PDUStreamProvider) lazyLoadMembers(
|
|
ctx context.Context, snapshot storage.DatabaseTransaction, roomID string,
|
|
incremental, limited bool, stateFilter *gomatrixserverlib.StateFilter,
|
|
device *userapi.Device,
|
|
timelineEvents, stateEvents []*gomatrixserverlib.HeaderedEvent,
|
|
) ([]*gomatrixserverlib.HeaderedEvent, error) {
|
|
if len(timelineEvents) == 0 {
|
|
return stateEvents, nil
|
|
}
|
|
// Work out which memberships to include
|
|
timelineUsers := make(map[string]struct{})
|
|
if !incremental {
|
|
timelineUsers[device.UserID] = struct{}{}
|
|
}
|
|
// Add all users the client doesn't know about yet to a list
|
|
for _, event := range timelineEvents {
|
|
// Membership is not yet cached, add it to the list
|
|
if _, ok := p.lazyLoadCache.IsLazyLoadedUserCached(device, roomID, event.Sender()); !ok {
|
|
timelineUsers[event.Sender()] = struct{}{}
|
|
}
|
|
}
|
|
// Preallocate with the same amount, even if it will end up with fewer values
|
|
newStateEvents := make([]*gomatrixserverlib.HeaderedEvent, 0, len(stateEvents))
|
|
// Remove existing membership events we don't care about, e.g. users not in the timeline.events
|
|
for _, event := range stateEvents {
|
|
if event.Type() == gomatrixserverlib.MRoomMember && event.StateKey() != nil {
|
|
// If this is a gapped incremental sync, we still want this membership
|
|
isGappedIncremental := limited && incremental
|
|
// We want this users membership event, keep it in the list
|
|
stateKey := *event.StateKey()
|
|
if _, ok := timelineUsers[stateKey]; ok || isGappedIncremental {
|
|
newStateEvents = append(newStateEvents, event)
|
|
if !stateFilter.IncludeRedundantMembers {
|
|
p.lazyLoadCache.StoreLazyLoadedUser(device, roomID, stateKey, event.EventID())
|
|
}
|
|
delete(timelineUsers, stateKey)
|
|
}
|
|
} else {
|
|
newStateEvents = append(newStateEvents, event)
|
|
}
|
|
}
|
|
wantUsers := make([]string, 0, len(timelineUsers))
|
|
for userID := range timelineUsers {
|
|
wantUsers = append(wantUsers, userID)
|
|
}
|
|
// Query missing membership events
|
|
filter := gomatrixserverlib.DefaultStateFilter()
|
|
filter.Limit = stateFilter.Limit
|
|
filter.Senders = &wantUsers
|
|
filter.Types = &[]string{gomatrixserverlib.MRoomMember}
|
|
memberships, err := snapshot.GetStateEventsForRoom(ctx, roomID, &filter)
|
|
if err != nil {
|
|
return stateEvents, err
|
|
}
|
|
// cache the membership events
|
|
for _, membership := range memberships {
|
|
p.lazyLoadCache.StoreLazyLoadedUser(device, roomID, *membership.StateKey(), membership.EventID())
|
|
}
|
|
stateEvents = append(newStateEvents, memberships...)
|
|
return stateEvents, nil
|
|
}
|
|
|
|
// addIgnoredUsersToFilter adds ignored users to the eventfilter and
|
|
// the syncreq itself for further use in streams.
|
|
func (p *PDUStreamProvider) addIgnoredUsersToFilter(ctx context.Context, snapshot storage.DatabaseTransaction, req *types.SyncRequest, eventFilter *gomatrixserverlib.RoomEventFilter) error {
|
|
ignores, err := snapshot.IgnoresForUser(ctx, req.Device.UserID)
|
|
if err != nil {
|
|
if err == sql.ErrNoRows {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
req.IgnoredUsers = *ignores
|
|
userList := make([]string, 0, len(ignores.List))
|
|
for userID := range ignores.List {
|
|
userList = append(userList, userID)
|
|
}
|
|
if len(userList) > 0 {
|
|
eventFilter.NotSenders = &userList
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func removeDuplicates(stateEvents, recentEvents []*gomatrixserverlib.HeaderedEvent) []*gomatrixserverlib.HeaderedEvent {
|
|
for _, recentEv := range recentEvents {
|
|
if recentEv.StateKey() == nil {
|
|
continue // not a state event
|
|
}
|
|
// TODO: This is a linear scan over all the current state events in this room. This will
|
|
// be slow for big rooms. We should instead sort the state events by event ID (ORDER BY)
|
|
// then do a binary search to find matching events, similar to what roomserver does.
|
|
for j := 0; j < len(stateEvents); j++ {
|
|
if stateEvents[j].EventID() == recentEv.EventID() {
|
|
// overwrite the element to remove with the last element then pop the last element.
|
|
// This is orders of magnitude faster than re-slicing, but doesn't preserve ordering
|
|
// (we don't care about the order of stateEvents)
|
|
stateEvents[j] = stateEvents[len(stateEvents)-1]
|
|
stateEvents = stateEvents[:len(stateEvents)-1]
|
|
break // there shouldn't be multiple events with the same event ID
|
|
}
|
|
}
|
|
}
|
|
return stateEvents
|
|
}
|