103 lines
3.3 KiB
Go
103 lines
3.3 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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"encoding/json"
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log "github.com/Sirupsen/logrus"
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"github.com/matrix-org/dendrite/common"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/syncapi/config"
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"github.com/matrix-org/dendrite/syncapi/storage"
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"github.com/matrix-org/dendrite/syncapi/sync"
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"github.com/matrix-org/dendrite/syncapi/types"
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"github.com/matrix-org/gomatrixserverlib"
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sarama "gopkg.in/Shopify/sarama.v1"
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)
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// Server contains all the logic for running a sync server
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type Server struct {
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roomServerConsumer *common.ContinualConsumer
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db *storage.SyncServerDatabase
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rp *sync.RequestPool
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}
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// NewServer creates a new sync server. Call Start() to begin consuming from room servers.
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func NewServer(cfg *config.Sync, rp *sync.RequestPool, store *storage.SyncServerDatabase) (*Server, error) {
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kafkaConsumer, err := sarama.NewConsumer(cfg.KafkaConsumerURIs, nil)
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if err != nil {
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return nil, err
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}
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consumer := common.ContinualConsumer{
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Topic: cfg.RoomserverOutputTopic,
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Consumer: kafkaConsumer,
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PartitionStore: store,
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}
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s := &Server{
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roomServerConsumer: &consumer,
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db: store,
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rp: rp,
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}
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consumer.ProcessMessage = s.onMessage
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return s, nil
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}
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// Start consuming from room servers
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func (s *Server) 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 *Server) onMessage(msg *sarama.ConsumerMessage) error {
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// Parse out the event JSON
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var output api.OutputRoomEvent
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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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ev, err := gomatrixserverlib.NewEventFromTrustedJSON(output.Event, false)
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if err != nil {
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log.WithError(err).Errorf("roomserver output log: event parse failure")
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return nil
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}
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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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}).Info("received event from roomserver")
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syncStreamPos, err := s.db.WriteEvent(&ev, output.AddsStateEventIDs, output.RemovesStateEventIDs)
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if err != nil {
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// panic rather than continue with an inconsistent database
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log.WithFields(log.Fields{
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"event": string(ev.JSON()),
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log.ErrorKey: err,
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"add": output.AddsStateEventIDs,
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"del": output.RemovesStateEventIDs,
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}).Panicf("roomserver output log: write event failure")
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return nil
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}
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s.rp.OnNewEvent(&ev, types.StreamPosition(syncStreamPos))
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return nil
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}
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