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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/common"
"github.com/matrix-org/dendrite/common/config"
"github.com/matrix-org/dendrite/publicroomsapi/storage"
"github.com/matrix-org/dendrite/roomserver/api"
"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 *common.ContinualConsumer
db storage.Database
}
// NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call Start() to begin consuming from room servers.
func NewOutputRoomEventConsumer(
cfg *config.Dendrite,
kafkaConsumer sarama.Consumer,
store storage.Database,
rsAPI api.RoomserverInternalAPI,
) *OutputRoomEventConsumer {
consumer := common.ContinualConsumer{
Topic: string(cfg.Kafka.Topics.OutputRoomEvent),
Consumer: kafkaConsumer,
PartitionStore: store,
}
s := &OutputRoomEventConsumer{
rsConsumer: &consumer,
db: store,
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.
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
}
if output.Type != api.OutputTypeNewRoomEvent {
log.WithField("type", output.Type).Debug(
"roomserver output log: ignoring unknown output type",
)
return nil
}
ev := output.NewRoomEvent.Event
log.WithFields(log.Fields{
"event_id": ev.EventID(),
"room_id": ev.RoomID(),
"type": ev.Type(),
}).Info("received event from roomserver")
addQueryReq := api.QueryEventsByIDRequest{EventIDs: output.NewRoomEvent.AddsStateEventIDs}
var addQueryRes api.QueryEventsByIDResponse
if err := s.rsAPI.QueryEventsByID(context.TODO(), &addQueryReq, &addQueryRes); err != nil {
log.Warn(err)
return err
}
remQueryReq := api.QueryEventsByIDRequest{EventIDs: output.NewRoomEvent.RemovesStateEventIDs}
var remQueryRes api.QueryEventsByIDResponse
if err := s.rsAPI.QueryEventsByID(context.TODO(), &remQueryReq, &remQueryRes); err != nil {
log.Warn(err)
return err
}
var addQueryEvents, remQueryEvents []gomatrixserverlib.Event
for _, headeredEvent := range addQueryRes.Events {
addQueryEvents = append(addQueryEvents, headeredEvent.Event)
}
for _, headeredEvent := range remQueryRes.Events {
remQueryEvents = append(remQueryEvents, headeredEvent.Event)
}
return s.db.UpdateRoomFromEvents(context.TODO(), addQueryEvents, remQueryEvents)
}
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