145 lines
4.7 KiB
Go
145 lines
4.7 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/matrix-org/dendrite/clientapi/auth/storage/accounts"
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"github.com/matrix-org/dendrite/common"
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"github.com/matrix-org/dendrite/common/config"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/gomatrixserverlib"
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log "github.com/sirupsen/logrus"
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sarama "gopkg.in/Shopify/sarama.v1"
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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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roomServerConsumer *common.ContinualConsumer
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db accounts.Database
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query api.RoomserverQueryAPI
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serverName string
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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.Dendrite,
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kafkaConsumer sarama.Consumer,
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store accounts.Database,
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queryAPI api.RoomserverQueryAPI,
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) *OutputRoomEventConsumer {
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consumer := common.ContinualConsumer{
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Topic: string(cfg.Kafka.Topics.OutputRoomEvent),
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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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roomServerConsumer: &consumer,
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db: store,
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query: queryAPI,
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serverName: string(cfg.Matrix.ServerName),
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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.roomServerConsumer.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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if output.Type != api.OutputTypeNewRoomEvent {
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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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ev := output.NewRoomEvent.Event
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log.WithFields(log.Fields{
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"event_id": ev.EventID(),
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"room_id": ev.RoomID(),
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"type": ev.Type(),
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}).Info("received event from roomserver")
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events, err := s.lookupStateEvents(output.NewRoomEvent.AddsStateEventIDs, ev)
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if err != nil {
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return err
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}
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return s.db.UpdateMemberships(context.TODO(), events, output.NewRoomEvent.RemovesStateEventIDs)
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}
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// lookupStateEvents looks up the state events that are added by a new event.
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func (s *OutputRoomEventConsumer) lookupStateEvents(
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addsStateEventIDs []string, event gomatrixserverlib.Event,
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) ([]gomatrixserverlib.Event, error) {
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// Fast path if there aren't any new state events.
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if len(addsStateEventIDs) == 0 {
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// If the event is a membership update (e.g. for a profile update), it won't
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// show up in AddsStateEventIDs, so we need to add it manually
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if event.Type() == "m.room.member" {
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return []gomatrixserverlib.Event{event}, nil
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}
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return nil, nil
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}
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// Fast path if the only state event added is the event itself.
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if len(addsStateEventIDs) == 1 && addsStateEventIDs[0] == event.EventID() {
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return []gomatrixserverlib.Event{event}, nil
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}
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result := []gomatrixserverlib.Event{}
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missing := []string{}
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for _, id := range addsStateEventIDs {
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// Append the current event in the results if its ID is in the events list
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if id == event.EventID() {
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result = append(result, event)
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} else {
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// If the event isn't the current one, add it to the list of events
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// to retrieve from the roomserver
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missing = append(missing, id)
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}
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}
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// Request the missing events from the roomserver
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eventReq := api.QueryEventsByIDRequest{EventIDs: missing}
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var eventResp api.QueryEventsByIDResponse
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if err := s.query.QueryEventsByID(context.TODO(), &eventReq, &eventResp); err != nil {
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return nil, err
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}
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result = append(result, eventResp.Events...)
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return result, nil
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}
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