Glue up RoomserverConsumer to a database backend

src/github.com/matrix-org/dendrite/clientapi/config/config.go

@@ -25,4 +25,6 @@ type Sync struct {
 	RoomserverOutputTopic string
 	// A list of URIs to consume events from. These kafka logs should be produced by a Room Server.
 	KafkaConsumerURIs []string
+	// The postgres connection config for connecting to the database e.g a postgres:// URI
+	DataSource string
 }

src/github.com/matrix-org/dendrite/clientapi/storage/sync/sync.go

@@ -0,0 +1,37 @@
+package sync
+
+import (
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+)
+
+// Database represents a sync server database
+type Database struct {
+	db         *sql.DB
+	partitions common.PartitionOffsetStatements
+}
+
+// NewDatabase creates a new sync server database
+func NewDatabase(dataSourceName string) (*Database, error) {
+	var db *sql.DB
+	var err error
+	if db, err = sql.Open("postgres", dataSourceName); err != nil {
+		return nil, err
+	}
+	partitions := common.PartitionOffsetStatements{}
+	if err := partitions.Prepare(db); err != nil {
+		return nil, err
+	}
+	return &Database{db, partitions}, nil
+}
+
+// PartitionOffsets implements common.PartitionStorer
+func (d *Database) PartitionOffsets(topic string) ([]common.PartitionOffset, error) {
+	return d.partitions.SelectPartitionOffsets(topic)
+}
+
+// SetPartitionOffset implements common.PartitionStorer
+func (d *Database) SetPartitionOffset(topic string, partition int32, offset int64) error {
+	return d.partitions.UpsertPartitionOffset(topic, partition, offset)
+}

src/github.com/matrix-org/dendrite/cmd/dendrite-sync-server/main.go

@@ -8,6 +8,7 @@ import (
 	"github.com/matrix-org/dendrite/clientapi/config"
 	"github.com/matrix-org/dendrite/clientapi/consumers"
 	"github.com/matrix-org/dendrite/clientapi/routing"
+	"github.com/matrix-org/dendrite/clientapi/storage/sync"
 
 	log "github.com/Sirupsen/logrus"
 	"github.com/matrix-org/dugong"
@@ -41,13 +42,19 @@ func main() {
 	cfg := config.Sync{
 		KafkaConsumerURIs:     []string{"localhost:9092"},
 		RoomserverOutputTopic: "roomserverOutput",
+		DataSource:            "",
 	}
 
 	log.Info("Starting sync server")
 
-	consumer, err := consumers.NewRoomserverConsumer(&cfg, nil) // TODO: partition storer
+	db, err := sync.NewDatabase(cfg.DataSource)
 	if err != nil {
-		panic(err)
+		log.Panicf("startup: failed to create database with data source %s : %s", cfg.DataSource, err)
+	}
+
+	consumer, err := consumers.NewRoomserverConsumer(&cfg, db)
+	if err != nil {
+		log.Panicf("startup: failed to create roomserver consumer: %s", err)
 	}
 
 	routing.SetupSyncServer(http.DefaultServeMux, http.DefaultClient, cfg, consumer)