602 lines
20 KiB
Go
602 lines
20 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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"sync"
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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/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/tidwall/gjson"
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"go.uber.org/atomic"
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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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StreamProvider
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tasks chan func()
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workers atomic.Int32
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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) worker() {
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defer p.workers.Dec()
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for {
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select {
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case f := <-p.tasks:
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f()
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case <-time.After(time.Second * 10):
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return
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}
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}
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}
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func (p *PDUStreamProvider) queue(f func()) {
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if p.workers.Load() < PDU_STREAM_WORKERS {
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p.workers.Inc()
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go p.worker()
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}
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p.tasks <- f
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}
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func (p *PDUStreamProvider) Setup() {
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p.StreamProvider.Setup()
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p.tasks = make(chan func(), PDU_STREAM_QUEUESIZE)
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p.latestMutex.Lock()
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defer p.latestMutex.Unlock()
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id, err := p.DB.MaxStreamPositionForPDUs(context.Background())
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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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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 := p.DB.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, 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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var reqMutex sync.Mutex
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var reqWaitGroup sync.WaitGroup
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reqWaitGroup.Add(len(joinedRoomIDs))
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for _, room := range joinedRoomIDs {
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roomID := room
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p.queue(func() {
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defer reqWaitGroup.Done()
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jr, jerr := p.getJoinResponseForCompleteSync(
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ctx, roomID, r, &stateFilter, &eventFilter, req.WantFullState, req.Device,
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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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return
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}
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reqMutex.Lock()
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defer reqMutex.Unlock()
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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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}
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reqWaitGroup.Wait()
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// Add peeked rooms.
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peeks, err := p.DB.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, peek.RoomID, r, &stateFilter, &eventFilter, req.WantFullState, req.Device,
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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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return from
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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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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 joinedRooms []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, joinedRooms, err = p.DB.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
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}
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} else {
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if stateDeltas, joinedRooms, err = p.DB.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
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}
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}
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for _, roomID := range joinedRooms {
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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, 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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var pos types.StreamPosition
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if pos, err = p.addRoomDeltaToResponse(ctx, req.Device, r, delta, &eventFilter, &stateFilter, req.Response); err != nil {
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req.Log.WithError(err).Error("d.addRoomDeltaToResponse failed")
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return to
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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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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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res *types.Response,
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) (types.StreamPosition, error) {
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if delta.MembershipPos > 0 && delta.Membership == gomatrixserverlib.Leave {
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// make sure we don't leak recent events after the leave event.
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// TODO: History visibility makes this somewhat complex to handle correctly. For example:
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// TODO: This doesn't work for join -> leave in a single /sync request (see events prior to join).
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// TODO: This will fail on join -> leave -> sensitive msg -> join -> leave
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// in a single /sync request
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// This is all "okay" assuming history_visibility == "shared" which it is by default.
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r.To = delta.MembershipPos
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}
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recentStreamEvents, limited, err := p.DB.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 := p.DB.StreamEventsToEvents(device, recentStreamEvents)
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delta.StateEvents = removeDuplicates(delta.StateEvents, recentEvents) // roll back
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prevBatch, err := p.DB.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 = p.DB.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 len(recentEvents) > 0 {
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updateLatestPosition(recentEvents[len(recentEvents)-1].EventID())
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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 stateFilter.LazyLoadMembers {
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delta.StateEvents, err = p.lazyLoadMembers(
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ctx, delta.RoomID, true, limited, stateFilter.IncludeRedundantMembers,
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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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hasMembershipChange = true
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break
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}
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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, 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(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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res.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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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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res.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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// TODO: recentEvents may contain events that this user is not allowed to see because they are
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// no longer in the room.
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lr := types.NewLeaveResponse()
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lr.Timeline.PrevBatch = &prevBatch
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lr.Timeline.Events = gomatrixserverlib.HeaderedToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
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lr.Timeline.Limited = false // TODO: if len(events) >= numRecents + 1 and then set limited:true
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lr.State.Events = gomatrixserverlib.HeaderedToClientEvents(delta.StateEvents, gomatrixserverlib.FormatSync)
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res.Rooms.Leave[delta.RoomID] = *lr
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}
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return latestPosition, nil
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}
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func (p *PDUStreamProvider) addRoomSummary(ctx context.Context, 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, _ := p.DB.MembershipCount(ctx, roomID, gomatrixserverlib.Join, latestPosition)
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invitedCount, _ := p.DB.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 := p.DB.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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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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) (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 := p.DB.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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// TODO FIXME: We don't fully implement history visibility yet. To avoid leaking events which the
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// user shouldn't see, we check the recent events and remove any prior to the join event of the user
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// which is equiv to history_visibility: joined
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joinEventIndex := -1
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for i := len(recentStreamEvents) - 1; i >= 0; i-- {
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ev := recentStreamEvents[i]
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if ev.Type() == gomatrixserverlib.MRoomMember && ev.StateKeyEquals(device.UserID) {
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membership, _ := ev.Membership()
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if membership == "join" {
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joinEventIndex = i
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if i > 0 {
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// the create event happens before the first join, so we should cut it at that point instead
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if recentStreamEvents[i-1].Type() == gomatrixserverlib.MRoomCreate && recentStreamEvents[i-1].StateKeyEquals("") {
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joinEventIndex = i - 1
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break
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}
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}
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break
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}
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}
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}
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if joinEventIndex != -1 {
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// cut all events earlier than the join (but not the join itself)
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recentStreamEvents = recentStreamEvents[joinEventIndex:]
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limited = false // so clients know not to try to backpaginate
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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 := p.DB.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.
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var prevBatch *types.TopologyToken
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if len(recentStreamEvents) > 0 {
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var backwardTopologyPos, backwardStreamPos types.StreamPosition
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backwardTopologyPos, backwardStreamPos, err = p.DB.PositionInTopology(ctx, recentStreamEvents[0].EventID())
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if err != nil {
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return
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}
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prevBatch = &types.TopologyToken{
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Depth: backwardTopologyPos,
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PDUPosition: backwardStreamPos,
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}
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prevBatch.Decrement()
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}
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p.addRoomSummary(ctx, jr, roomID, device.UserID, r.From)
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// We don't include a device here as we don't need to send down
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// transaction IDs for complete syncs, but we do it anyway because Sytest demands it for:
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// "Can sync a room with a message with a transaction id" - which does a complete sync to check.
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recentEvents := p.DB.StreamEventsToEvents(device, recentStreamEvents)
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stateEvents = removeDuplicates(stateEvents, recentEvents)
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if stateFilter.LazyLoadMembers {
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if err != nil {
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return nil, err
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}
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stateEvents, err = p.lazyLoadMembers(ctx, roomID,
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false, limited, stateFilter.IncludeRedundantMembers,
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device, recentEvents, stateEvents,
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)
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if err != nil && err != sql.ErrNoRows {
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return nil, err
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}
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}
|
|
|
|
jr.Timeline.PrevBatch = prevBatch
|
|
jr.Timeline.Events = gomatrixserverlib.HeaderedToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
|
|
jr.Timeline.Limited = limited
|
|
jr.State.Events = gomatrixserverlib.HeaderedToClientEvents(stateEvents, gomatrixserverlib.FormatSync)
|
|
return jr, nil
|
|
}
|
|
|
|
func (p *PDUStreamProvider) lazyLoadMembers(
|
|
ctx context.Context, roomID string,
|
|
incremental, limited, includeRedundant bool,
|
|
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
|
|
_, ok := timelineUsers[event.Sender()]
|
|
wantMembership := ok || isGappedIncremental
|
|
if wantMembership {
|
|
newStateEvents = append(newStateEvents, event)
|
|
if !includeRedundant {
|
|
p.lazyLoadCache.StoreLazyLoadedUser(device, roomID, event.Sender(), event.EventID())
|
|
}
|
|
delete(timelineUsers, event.Sender())
|
|
}
|
|
} else {
|
|
newStateEvents = append(newStateEvents, event)
|
|
}
|
|
}
|
|
wantUsers := make([]string, 0, len(timelineUsers))
|
|
for userID := range timelineUsers {
|
|
wantUsers = append(wantUsers, userID)
|
|
}
|
|
// Query missing membership events
|
|
memberships, err := p.DB.GetStateEventsForRoom(ctx, roomID, &gomatrixserverlib.StateFilter{
|
|
Limit: 100,
|
|
Senders: &wantUsers,
|
|
Types: &[]string{gomatrixserverlib.MRoomMember},
|
|
})
|
|
if err != nil {
|
|
return stateEvents, err
|
|
}
|
|
// cache the membership events
|
|
for _, membership := range memberships {
|
|
p.lazyLoadCache.StoreLazyLoadedUser(device, roomID, membership.Sender(), 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, req *types.SyncRequest, eventFilter *gomatrixserverlib.RoomEventFilter) error {
|
|
ignores, err := p.DB.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
|
|
}
|