From 062325b6c6650284ffd17d4e16d237ab9ba3b27f Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Wed, 27 May 2020 14:37:13 +0100
Subject: [PATCH] Send to device consumer in sync API

---
 syncapi/consumers/eduserver_sendtodevice.go   | 82 +++++++++++++++++++
 .../{eduserver.go => eduserver_typing.go}     |  0
 syncapi/syncapi.go                            |  9 +-
 3 files changed, 90 insertions(+), 1 deletion(-)
 create mode 100644 syncapi/consumers/eduserver_sendtodevice.go
 rename syncapi/consumers/{eduserver.go => eduserver_typing.go} (100%)

diff --git a/syncapi/consumers/eduserver_sendtodevice.go b/syncapi/consumers/eduserver_sendtodevice.go
new file mode 100644
index 000000000..0382c6083
--- /dev/null
+++ b/syncapi/consumers/eduserver_sendtodevice.go
@@ -0,0 +1,82 @@
+// Copyright 2019 Alex Chen
+//
+// 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 (
+	"encoding/json"
+
+	"github.com/Shopify/sarama"
+	"github.com/matrix-org/dendrite/eduserver/api"
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/config"
+	"github.com/matrix-org/dendrite/syncapi/storage"
+	"github.com/matrix-org/dendrite/syncapi/sync"
+	log "github.com/sirupsen/logrus"
+)
+
+// OutputSendToDeviceEventConsumer consumes events that originated in the EDU server.
+type OutputSendToDeviceEventConsumer struct {
+	sendToDeviceConsumer *internal.ContinualConsumer
+	db                   storage.Database
+	notifier             *sync.Notifier
+}
+
+// NewOutputSendToDeviceEventConsumer creates a new OutputSendToDeviceEventConsumer.
+// Call Start() to begin consuming from the EDU server.
+func NewOutputSendToDeviceEventConsumer(
+	cfg *config.Dendrite,
+	kafkaConsumer sarama.Consumer,
+	n *sync.Notifier,
+	store storage.Database,
+) *OutputSendToDeviceEventConsumer {
+
+	consumer := internal.ContinualConsumer{
+		Topic:          string(cfg.Kafka.Topics.OutputSendToDeviceEventTopic),
+		Consumer:       kafkaConsumer,
+		PartitionStore: store,
+	}
+
+	s := &OutputSendToDeviceEventConsumer{
+		sendToDeviceConsumer: &consumer,
+		db:                   store,
+		notifier:             n,
+	}
+
+	consumer.ProcessMessage = s.onMessage
+
+	return s
+}
+
+// Start consuming from EDU api
+func (s *OutputSendToDeviceEventConsumer) Start() error {
+	return s.sendToDeviceConsumer.Start()
+}
+
+func (s *OutputSendToDeviceEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
+	var output api.OutputSendToDeviceEvent
+	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("EDU server output log: message parse failure")
+		return nil
+	}
+
+	log.WithFields(log.Fields{
+		"user_id":    output.UserID,
+		"device_id":  output.DeviceID,
+		"event_type": output.EventType,
+	}).Debug("received send-to-device event from EDU server")
+
+	return nil
+}
diff --git a/syncapi/consumers/eduserver.go b/syncapi/consumers/eduserver_typing.go
similarity index 100%
rename from syncapi/consumers/eduserver.go
rename to syncapi/consumers/eduserver_typing.go
diff --git a/syncapi/syncapi.go b/syncapi/syncapi.go
index 9251f6182..1dcf3118f 100644
--- a/syncapi/syncapi.go
+++ b/syncapi/syncapi.go
@@ -78,7 +78,14 @@ func SetupSyncAPIComponent(
 		base.Cfg, base.KafkaConsumer, notifier, syncDB,
 	)
 	if err = typingConsumer.Start(); err != nil {
-		logrus.WithError(err).Panicf("failed to start typing server consumer")
+		logrus.WithError(err).Panicf("failed to start typing consumer")
+	}
+
+	sendToDeviceConsumer := consumers.NewOutputClientDataConsumer(
+		base.Cfg, base.KafkaConsumer, notifier, syncDB,
+	)
+	if err = sendToDeviceConsumer.Start(); err != nil {
+		logrus.WithError(err).Panicf("failed to start send-to-device consumer")
 	}
 
 	routing.Setup(base.PublicAPIMux, requestPool, syncDB, deviceDB, federation, rsAPI, cfg)