92 lines
3 KiB
Go
92 lines
3 KiB
Go
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// 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/common/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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sarama "gopkg.in/Shopify/sarama.v1"
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)
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// OutputClientData consumes events that originated in the client API server.
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type OutputClientData struct {
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clientAPIConsumer *common.ContinualConsumer
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db *storage.SyncServerDatabase
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notifier *sync.Notifier
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}
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// NewOutputClientData creates a new OutputClientData consumer. Call Start() to begin consuming from room servers.
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func NewOutputClientData(cfg *config.Dendrite, n *sync.Notifier, store *storage.SyncServerDatabase) (*OutputClientData, error) {
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kafkaConsumer, err := sarama.NewConsumer(cfg.Kafka.Addresses, 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: string(cfg.Kafka.Topics.OutputClientData),
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Consumer: kafkaConsumer,
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PartitionStore: store,
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}
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s := &OutputClientData{
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clientAPIConsumer: &consumer,
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db: store,
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notifier: n,
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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 *OutputClientData) Start() error {
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return s.clientAPIConsumer.Start()
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}
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// onMessage is called when the sync server receives a new event from the client API 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 *OutputClientData) onMessage(msg *sarama.ConsumerMessage) error {
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// Parse out the event JSON
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var output common.AccountData
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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("client API server output log: message parse failure")
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return nil
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}
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log.WithFields(log.Fields{
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"type": output.Type,
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"room_id": output.RoomID,
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}).Info("received data from client API server")
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syncStreamPos, err := s.db.UpsertAccountData(string(msg.Key), output.RoomID, output.Type)
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if err != nil {
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log.WithFields(log.Fields{
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"type": output.Type,
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"room_id": output.RoomID,
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log.ErrorKey: err,
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}).Panicf("could not save account data")
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}
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s.notifier.OnNewEvent(nil, string(msg.Key), syncStreamPos)
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return nil
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}
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