1 files changed, 110 insertions, 0 deletions
diff --git a/syncapi/consumers/userapi.go b/syncapi/consumers/userapi.go
new file mode 100644
index 00000000..a3b2dd53
--- /dev/null
+++ b/syncapi/consumers/userapi.go
@@ -0,0 +1,110 @@
+// 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"
+)
+
+// 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.TopicFor(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, 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, msg *nats.Msg) bool {
+	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
+}