248 lines
7.3 KiB
Go
248 lines
7.3 KiB
Go
// Copyright 2017 Vector Creations Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package consumers
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import (
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"context"
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"encoding/json"
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"github.com/Shopify/sarama"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/dendrite/internal/config"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/syncapi/storage"
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"github.com/matrix-org/dendrite/syncapi/sync"
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"github.com/matrix-org/dendrite/syncapi/types"
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"github.com/matrix-org/gomatrixserverlib"
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log "github.com/sirupsen/logrus"
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)
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// OutputRoomEventConsumer consumes events that originated in the room server.
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type OutputRoomEventConsumer struct {
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rsAPI api.RoomserverInternalAPI
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rsConsumer *internal.ContinualConsumer
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db storage.Database
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notifier *sync.Notifier
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keyChanges *OutputKeyChangeEventConsumer
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}
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// NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call Start() to begin consuming from room servers.
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func NewOutputRoomEventConsumer(
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cfg *config.SyncAPI,
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kafkaConsumer sarama.Consumer,
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n *sync.Notifier,
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store storage.Database,
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rsAPI api.RoomserverInternalAPI,
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keyChanges *OutputKeyChangeEventConsumer,
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) *OutputRoomEventConsumer {
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consumer := internal.ContinualConsumer{
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ComponentName: "syncapi/roomserver",
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Topic: string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputRoomEvent)),
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Consumer: kafkaConsumer,
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PartitionStore: store,
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}
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s := &OutputRoomEventConsumer{
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rsConsumer: &consumer,
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db: store,
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notifier: n,
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rsAPI: rsAPI,
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keyChanges: keyChanges,
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}
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consumer.ProcessMessage = s.onMessage
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return s
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}
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// Start consuming from room servers
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func (s *OutputRoomEventConsumer) Start() error {
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return s.rsConsumer.Start()
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}
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// onMessage is called when the sync server receives a new event from the room server output log.
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// It is not safe for this function to be called from multiple goroutines, or else the
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// sync stream position may race and be incorrectly calculated.
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func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
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// Parse out the event JSON
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var output api.OutputEvent
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if err := json.Unmarshal(msg.Value, &output); err != nil {
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// If the message was invalid, log it and move on to the next message in the stream
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log.WithError(err).Errorf("roomserver output log: message parse failure")
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return nil
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}
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switch output.Type {
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case api.OutputTypeNewRoomEvent:
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// Ignore redaction events. We will add them to the database when they are
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// validated (when we receive OutputTypeRedactedEvent)
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event := output.NewRoomEvent.Event
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if event.Type() == gomatrixserverlib.MRoomRedaction && event.StateKey() == nil {
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// in the special case where the event redacts itself, just pass the message through because
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// we will never see the other part of the pair
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if event.Redacts() != event.EventID() {
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return nil
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}
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}
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return s.onNewRoomEvent(context.TODO(), *output.NewRoomEvent)
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case api.OutputTypeNewInviteEvent:
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return s.onNewInviteEvent(context.TODO(), *output.NewInviteEvent)
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case api.OutputTypeRetireInviteEvent:
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return s.onRetireInviteEvent(context.TODO(), *output.RetireInviteEvent)
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case api.OutputTypeRedactedEvent:
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return s.onRedactEvent(context.TODO(), *output.RedactedEvent)
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default:
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log.WithField("type", output.Type).Debug(
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"roomserver output log: ignoring unknown output type",
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)
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return nil
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}
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}
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func (s *OutputRoomEventConsumer) onRedactEvent(
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ctx context.Context, msg api.OutputRedactedEvent,
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) error {
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err := s.db.RedactEvent(ctx, msg.RedactedEventID, &msg.RedactedBecause)
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if err != nil {
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log.WithError(err).Error("RedactEvent error'd")
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return err
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}
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// fake a room event so we notify clients about the redaction, as if it were
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// a normal event.
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return s.onNewRoomEvent(ctx, api.OutputNewRoomEvent{
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Event: msg.RedactedBecause,
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})
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}
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func (s *OutputRoomEventConsumer) onNewRoomEvent(
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ctx context.Context, msg api.OutputNewRoomEvent,
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) error {
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ev := msg.Event
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addsStateEvents := msg.AddsState()
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ev, err := s.updateStateEvent(ev)
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if err != nil {
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return err
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}
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for i := range addsStateEvents {
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addsStateEvents[i], err = s.updateStateEvent(addsStateEvents[i])
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if err != nil {
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return err
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}
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}
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pduPos, err := s.db.WriteEvent(
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ctx,
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&ev,
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addsStateEvents,
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msg.AddsStateEventIDs,
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msg.RemovesStateEventIDs,
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msg.TransactionID,
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false,
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)
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if err != nil {
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// panic rather than continue with an inconsistent database
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log.WithFields(log.Fields{
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"event": string(ev.JSON()),
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log.ErrorKey: err,
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"add": msg.AddsStateEventIDs,
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"del": msg.RemovesStateEventIDs,
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}).Panicf("roomserver output log: write event failure")
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return nil
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}
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s.notifier.OnNewEvent(&ev, "", nil, types.NewStreamToken(pduPos, 0, nil))
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s.notifyKeyChanges(&ev)
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return nil
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}
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func (s *OutputRoomEventConsumer) notifyKeyChanges(ev *gomatrixserverlib.HeaderedEvent) {
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membership, err := ev.Membership()
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if err != nil {
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return
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}
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switch membership {
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case gomatrixserverlib.Join:
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s.keyChanges.OnJoinEvent(ev)
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case gomatrixserverlib.Ban:
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fallthrough
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case gomatrixserverlib.Leave:
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s.keyChanges.OnLeaveEvent(ev)
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}
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}
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func (s *OutputRoomEventConsumer) onNewInviteEvent(
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ctx context.Context, msg api.OutputNewInviteEvent,
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) error {
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pduPos, err := s.db.AddInviteEvent(ctx, msg.Event)
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if err != nil {
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// panic rather than continue with an inconsistent database
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log.WithFields(log.Fields{
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"event": string(msg.Event.JSON()),
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"pdupos": pduPos,
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log.ErrorKey: err,
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}).Panicf("roomserver output log: write invite failure")
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return nil
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}
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s.notifier.OnNewEvent(&msg.Event, "", nil, types.NewStreamToken(pduPos, 0, nil))
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return nil
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}
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func (s *OutputRoomEventConsumer) onRetireInviteEvent(
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ctx context.Context, msg api.OutputRetireInviteEvent,
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) error {
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sp, err := s.db.RetireInviteEvent(ctx, msg.EventID)
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if err != nil {
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// panic rather than continue with an inconsistent database
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log.WithFields(log.Fields{
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"event_id": msg.EventID,
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log.ErrorKey: err,
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}).Panicf("roomserver output log: remove invite failure")
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return nil
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}
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// Notify any active sync requests that the invite has been retired.
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// Invites share the same stream counter as PDUs
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s.notifier.OnNewEvent(nil, "", []string{msg.TargetUserID}, types.NewStreamToken(sp, 0, nil))
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return nil
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}
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func (s *OutputRoomEventConsumer) updateStateEvent(event gomatrixserverlib.HeaderedEvent) (gomatrixserverlib.HeaderedEvent, error) {
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if event.StateKey() == nil {
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return event, nil
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}
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stateKey := *event.StateKey()
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prevEvent, err := s.db.GetStateEvent(
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context.TODO(), event.RoomID(), event.Type(), stateKey,
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)
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if err != nil {
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return event, err
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}
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if prevEvent == nil {
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return event, nil
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}
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prev := types.PrevEventRef{
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PrevContent: prevEvent.Content(),
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ReplacesState: prevEvent.EventID(),
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PrevSender: prevEvent.Sender(),
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}
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event.Event, err = event.SetUnsigned(prev)
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return event, err
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}
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