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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// 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/currentstateserver/acls"
"github.com/matrix-org/dendrite/currentstateserver/storage"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/syncapi/types"
"github.com/matrix-org/gomatrixserverlib"
log "github.com/sirupsen/logrus"
)
type OutputRoomEventConsumer struct {
rsConsumer *internal.ContinualConsumer
db storage.Database
acls *acls.ServerACLs
}
func NewOutputRoomEventConsumer(topicName string, kafkaConsumer sarama.Consumer, store storage.Database, acls *acls.ServerACLs) *OutputRoomEventConsumer {
consumer := &internal.ContinualConsumer{
ComponentName: "currentstateserver/roomserver",
Topic: topicName,
Consumer: kafkaConsumer,
PartitionStore: store,
}
s := &OutputRoomEventConsumer{
rsConsumer: consumer,
db: store,
acls: acls,
}
consumer.ProcessMessage = s.onMessage
return s
}
func (c *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 c.onNewRoomEvent(context.TODO(), *output.NewRoomEvent)
case api.OutputTypeNewInviteEvent:
case api.OutputTypeRetireInviteEvent:
case api.OutputTypeRedactedEvent:
return c.onRedactEvent(context.Background(), *output.RedactedEvent)
default:
log.WithField("type", output.Type).Debug(
"roomserver output log: ignoring unknown output type",
)
}
return nil
}
func (c *OutputRoomEventConsumer) onNewRoomEvent(
ctx context.Context, msg api.OutputNewRoomEvent,
) error {
ev := msg.Event
if ev.Type() == "m.room.server_acl" && ev.StateKeyEquals("") {
defer c.acls.OnServerACLUpdate(&ev.Event)
}
addsStateEvents := msg.AddsState()
ev, err := c.updateStateEvent(ev)
if err != nil {
return err
}
for i := range addsStateEvents {
addsStateEvents[i], err = c.updateStateEvent(addsStateEvents[i])
if err != nil {
return err
}
}
err = c.db.StoreStateEvents(
ctx,
addsStateEvents,
msg.RemovesStateEventIDs,
)
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
}
func (c *OutputRoomEventConsumer) onRedactEvent(
ctx context.Context, msg api.OutputRedactedEvent,
) error {
return c.db.RedactEvent(ctx, msg.RedactedEventID, msg.RedactedBecause)
}
// Start consuming from room servers
func (c *OutputRoomEventConsumer) Start() error {
return c.rsConsumer.Start()
}
func (c *OutputRoomEventConsumer) updateStateEvent(event gomatrixserverlib.HeaderedEvent) (gomatrixserverlib.HeaderedEvent, error) {
stateKey := ""
if event.StateKey() != nil {
stateKey = *event.StateKey()
}
prevEvent, err := c.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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