package jetstream import ( "strings" "sync" "time" "github.com/matrix-org/dendrite/setup/config" "github.com/sirupsen/logrus" natsserver "github.com/nats-io/nats-server/v2/server" natsclient "github.com/nats-io/nats.go" ) var natsServer *natsserver.Server var natsServerMutex sync.Mutex func Prepare(cfg *config.JetStream) natsclient.JetStreamContext { // check if we need an in-process NATS Server if len(cfg.Addresses) != 0 { return setupNATS(cfg, nil) } natsServerMutex.Lock() if natsServer == nil { var err error natsServer, err = natsserver.NewServer(&natsserver.Options{ ServerName: "monolith", DontListen: true, JetStream: true, StoreDir: string(cfg.StoragePath), NoSystemAccount: true, MaxPayload: 16 * 1024 * 1024, }) if err != nil { panic(err) } natsServer.ConfigureLogger() go natsServer.Start() } natsServerMutex.Unlock() if !natsServer.ReadyForConnections(time.Second * 10) { logrus.Fatalln("NATS did not start in time") } nc, err := natsclient.Connect("", natsclient.InProcessServer(natsServer)) if err != nil { logrus.Fatalln("Failed to create NATS client") } return setupNATS(cfg, nc) } func setupNATS(cfg *config.JetStream, nc *natsclient.Conn) natsclient.JetStreamContext { if nc == nil { var err error nc, err = natsclient.Connect(strings.Join(cfg.Addresses, ",")) if err != nil { logrus.WithError(err).Panic("Unable to connect to NATS") return nil } } s, err := nc.JetStream() if err != nil { logrus.WithError(err).Panic("Unable to get JetStream context") return nil } for _, stream := range streams { // streams are defined in streams.go name := cfg.TopicFor(stream.Name) info, err := s.StreamInfo(name) if err != nil && err != natsclient.ErrStreamNotFound { logrus.WithError(err).Fatal("Unable to get stream info") } if info == nil { stream.Subjects = []string{name} // If we're trying to keep everything in memory (e.g. unit tests) // then overwrite the storage policy. if cfg.InMemory { stream.Storage = natsclient.MemoryStorage } // Namespace the streams without modifying the original streams // array, otherwise we end up with namespaces on namespaces. namespaced := *stream namespaced.Name = name if _, err = s.AddStream(&namespaced); err != nil { logrus.WithError(err).WithField("stream", name).Fatal("Unable to add stream") } } } return s }