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// 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"
"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"
log "github.com/sirupsen/logrus"
)
// OutputRoomEventConsumer consumes events that originated in the room server.
type OutputRoomEventConsumer struct {
rsAPI api.RoomserverInternalAPI
rsConsumer *internal.ContinualConsumer
db storage.Database
notifier *sync.Notifier
}
// NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call Start() to begin consuming from room servers.
func NewOutputRoomEventConsumer(
cfg *config.Dendrite,
kafkaConsumer sarama.Consumer,
n *sync.Notifier,
store storage.Database,
rsAPI api.RoomserverInternalAPI,
) *OutputRoomEventConsumer {
consumer := internal.ContinualConsumer{
Topic: string(cfg.Kafka.Topics.OutputRoomEvent),
Consumer: kafkaConsumer,
PartitionStore: store,
}
s := &OutputRoomEventConsumer{
rsConsumer: &consumer,
db: store,
notifier: n,
rsAPI: rsAPI,
}
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:
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)
default:
log.WithField("type", output.Type).Debug(
"roomserver output log: ignoring unknown output type",
)
return nil
}
}
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
}
}
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
}
s.notifier.OnNewEvent(&ev, "", nil, types.NewStreamToken(pduPos, 0))
return 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))
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))
return nil
}
func (s *OutputRoomEventConsumer) updateStateEvent(event gomatrixserverlib.HeaderedEvent) (gomatrixserverlib.HeaderedEvent, error) {
var stateKey string
if event.StateKey() == nil {
stateKey = ""
} else {
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
}
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