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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/nats-io/nats.go"
log "github.com/sirupsen/logrus"
"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"
)
// OutputNotificationDataConsumer consumes events that originated in
// the Push server.
type OutputNotificationDataConsumer struct {
ctx context.Context
jetstream nats.JetStreamContext
durable string
topic string
db storage.Database
notifier *notifier.Notifier
stream types.StreamProvider
}
// NewOutputNotificationDataConsumer creates a new consumer. Call
// Start() to begin consuming.
func NewOutputNotificationDataConsumer(
process *process.ProcessContext,
cfg *config.SyncAPI,
js nats.JetStreamContext,
store storage.Database,
notifier *notifier.Notifier,
stream types.StreamProvider,
) *OutputNotificationDataConsumer {
s := &OutputNotificationDataConsumer{
ctx: process.Context(),
jetstream: js,
durable: cfg.Matrix.JetStream.Durable("SyncAPINotificationDataConsumer"),
topic: cfg.Matrix.JetStream.Prefixed(jetstream.OutputNotificationData),
db: store,
notifier: notifier,
stream: stream,
}
return s
}
// Start starts consumption.
func (s *OutputNotificationDataConsumer) Start() error {
return jetstream.JetStreamConsumer(
s.ctx, s.jetstream, s.topic, s.durable, 1,
s.onMessage, nats.DeliverAll(), nats.ManualAck(),
)
}
// onMessage is called when the Sync server receives a new event from
// the push server. 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 *OutputNotificationDataConsumer) onMessage(ctx context.Context, msgs []*nats.Msg) bool {
msg := msgs[0] // Guaranteed to exist if onMessage is called
userID := string(msg.Header.Get(jetstream.UserID))
// Parse out the event JSON
var data eventutil.NotificationData
if err := json.Unmarshal(msg.Data, &data); err != nil {
sentry.CaptureException(err)
log.WithField("user_id", userID).WithError(err).Error("user API consumer: message parse failure")
return true
}
streamPos, err := s.db.UpsertRoomUnreadNotificationCounts(ctx, userID, data.RoomID, data.UnreadNotificationCount, data.UnreadHighlightCount)
if err != nil {
sentry.CaptureException(err)
log.WithFields(log.Fields{
"user_id": userID,
"room_id": data.RoomID,
}).WithError(err).Error("Could not save notification counts")
return false
}
s.stream.Advance(streamPos)
s.notifier.OnNewNotificationData(userID, types.StreamingToken{NotificationDataPosition: streamPos})
log.WithFields(log.Fields{
"user_id": userID,
"room_id": data.RoomID,
"streamPos": streamPos,
}).Trace("Received notification data from user API")
return true
}
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