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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/getsentry/sentry-go"
"github.com/matrix-org/dendrite/internal/eventutil"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/dendrite/setup/jetstream"
"github.com/matrix-org/dendrite/setup/process"
"github.com/matrix-org/dendrite/syncapi/notifier"
"github.com/matrix-org/dendrite/syncapi/storage"
"github.com/matrix-org/dendrite/syncapi/types"
"github.com/nats-io/nats.go"
log "github.com/sirupsen/logrus"
)
// OutputClientDataConsumer consumes events that originated in the client API server.
type OutputClientDataConsumer struct {
ctx context.Context
jetstream nats.JetStreamContext
topic string
db storage.Database
stream types.StreamProvider
notifier *notifier.Notifier
}
// NewOutputClientDataConsumer creates a new OutputClientData consumer. Call Start() to begin consuming from room servers.
func NewOutputClientDataConsumer(
process *process.ProcessContext,
cfg *config.SyncAPI,
js nats.JetStreamContext,
store storage.Database,
notifier *notifier.Notifier,
stream types.StreamProvider,
) *OutputClientDataConsumer {
return &OutputClientDataConsumer{
ctx: process.Context(),
jetstream: js,
topic: cfg.Matrix.JetStream.TopicFor(jetstream.OutputClientData),
db: store,
notifier: notifier,
stream: stream,
}
}
// Start consuming from room servers
func (s *OutputClientDataConsumer) Start() error {
_, err := s.jetstream.Subscribe(s.topic, s.onMessage)
return err
}
// 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 *nats.Msg) {
jetstream.WithJetStreamMessage(msg, func(msg *nats.Msg) bool {
// Parse out the event JSON
userID := msg.Header.Get(jetstream.UserID)
var output eventutil.AccountData
if err := json.Unmarshal(msg.Data, &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")
sentry.CaptureException(err)
return true
}
log.WithFields(log.Fields{
"type": output.Type,
"room_id": output.RoomID,
}).Info("received data from client API server")
streamPos, err := s.db.UpsertAccountData(
s.ctx, userID, output.RoomID, output.Type,
)
if err != nil {
sentry.CaptureException(err)
log.WithFields(log.Fields{
"type": output.Type,
"room_id": output.RoomID,
log.ErrorKey: err,
}).Panicf("could not save account data")
}
s.stream.Advance(streamPos)
s.notifier.OnNewAccountData(userID, types.StreamingToken{AccountDataPosition: streamPos})
return true
})
}
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