package google_pub_sub import ( "context" "fmt" "os" "cloud.google.com/go/pubsub" "github.com/golang/protobuf/proto" "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/notification" "github.com/seaweedfs/seaweedfs/weed/util" "google.golang.org/api/option" ) func init() { notification.MessageQueues = append(notification.MessageQueues, &GooglePubSub{}) } type GooglePubSub struct { topic *pubsub.Topic } func (k *GooglePubSub) GetName() string { return "google_pub_sub" } func (k *GooglePubSub) Initialize(configuration util.Configuration, prefix string) (err error) { glog.V(0).Infof("notification.google_pub_sub.project_id: %v", configuration.GetString(prefix+"project_id")) glog.V(0).Infof("notification.google_pub_sub.topic: %v", configuration.GetString(prefix+"topic")) return k.initialize( configuration.GetString(prefix+"google_application_credentials"), configuration.GetString(prefix+"project_id"), configuration.GetString(prefix+"topic"), ) } func (k *GooglePubSub) initialize(google_application_credentials, projectId, topicName string) (err error) { ctx := context.Background() // Creates a client. if google_application_credentials == "" { var found bool google_application_credentials, found = os.LookupEnv("GOOGLE_APPLICATION_CREDENTIALS") if !found { glog.Fatalf("need to specific GOOGLE_APPLICATION_CREDENTIALS env variable or google_application_credentials in filer.toml") } } client, err := pubsub.NewClient(ctx, projectId, option.WithCredentialsFile(google_application_credentials)) if err != nil { glog.Fatalf("Failed to create client: %v", err) } k.topic = client.Topic(topicName) if exists, err := k.topic.Exists(ctx); err == nil { if !exists { k.topic, err = client.CreateTopic(ctx, topicName) if err != nil { glog.Fatalf("Failed to create topic %s: %v", topicName, err) } } } else { glog.Fatalf("Failed to check topic %s: %v", topicName, err) } return nil } func (k *GooglePubSub) SendMessage(key string, message proto.Message) (err error) { bytes, err := proto.Marshal(message) if err != nil { return } ctx := context.Background() result := k.topic.Publish(ctx, &pubsub.Message{ Data: bytes, Attributes: map[string]string{"key": key}, }) _, err = result.Get(ctx) if err != nil { return fmt.Errorf("send message to google pub sub %s: %v", k.topic.String(), err) } return nil }