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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/internal"
"github.com/matrix-org/dendrite/internal/config"
"github.com/matrix-org/dendrite/internal/eventutil"
"github.com/matrix-org/dendrite/syncapi/storage"
"github.com/matrix-org/dendrite/syncapi/sync"
"github.com/matrix-org/dendrite/syncapi/types"
log "github.com/sirupsen/logrus"
)
// OutputClientDataConsumer consumes events that originated in the client API server.
type OutputClientDataConsumer struct {
clientAPIConsumer *internal.ContinualConsumer
db storage.Database
notifier *sync.Notifier
}
// NewOutputClientDataConsumer creates a new OutputClientData consumer. Call Start() to begin consuming from room servers.
func NewOutputClientDataConsumer(
cfg *config.SyncAPI,
kafkaConsumer sarama.Consumer,
n *sync.Notifier,
store storage.Database,
) *OutputClientDataConsumer {
consumer := internal.ContinualConsumer{
Topic: string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputClientData)),
Consumer: kafkaConsumer,
PartitionStore: store,
}
s := &OutputClientDataConsumer{
clientAPIConsumer: &consumer,
db: store,
notifier: n,
}
consumer.ProcessMessage = s.onMessage
return s
}
// Start consuming from room servers
func (s *OutputClientDataConsumer) Start() error {
return s.clientAPIConsumer.Start()
}
// onMessage is called when the sync server receives a new event from the client API server output log.
// It is not safe for this function to be called from multiple goroutines, or else the
// sync stream position may race and be incorrectly calculated.
func (s *OutputClientDataConsumer) onMessage(msg *sarama.ConsumerMessage) error {
// Parse out the event JSON
var output eventutil.AccountData
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("client API server output log: message parse failure")
return nil
}
log.WithFields(log.Fields{
"type": output.Type,
"room_id": output.RoomID,
}).Info("received data from client API server")
pduPos, err := s.db.UpsertAccountData(
context.TODO(), string(msg.Key), output.RoomID, output.Type,
)
if err != nil {
log.WithFields(log.Fields{
"type": output.Type,
"room_id": output.RoomID,
log.ErrorKey: err,
}).Panicf("could not save account data")
}
s.notifier.OnNewEvent(nil, "", []string{string(msg.Key)}, types.NewStreamToken(pduPos, 0, nil))
return nil
}
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