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