dendrite/syncapi/consumers/roomserver.go
Neil Alexander 965f068d1a
Handle state with input event as new events (#1415)
* SendEventWithState events as new

* Use cumulative state IDs for final event

* Error wrapping in calculateAndSetState

* Handle overwriting same event type and state key

* Hacky way to spot historical events

* Don't exclude from sync

* Don't generate output events when rewriting forward extremities

* Update output event check

* Historical output events

* Define output room event type

* Notify key changes on state

* Don't send our membership event twice

* Deduplicate state entries

* Tweaks

* Remove unnecessary nolint

* Fix current state upsert in sync API

* Send auth events as outliers, state events as rewrite

* Sync API don't consume state events

* Process events actually

* Improve outlier check

* Fix local room check

* Remove extra room check, it seems to break the whole damn world

* Fix federated join check

* Fix nil pointer exception

* Better comments on DeduplicateStateEntries

* Reflow forced federated joins

* Don't force federated join for possibly even local invites

* Comment SendEventWithState better

* Rewrite room state in sync API storage

* Add TODO

* Clean up all room data when receiving create event

* Don't generate output events for rewrites, but instead notify that state is rewritten on the final new event

* Rename to PurgeRoom

* Exclude backfilled messages from /sync

* Split out rewriting state from updating state from state res

Co-authored-by: Kegan Dougal <kegan@matrix.org>
2020-09-15 11:17:46 +01:00

317 lines
9.4 KiB
Go

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