mirror of https://github.com/chrislusf/seaweedfs
110 lines
3.0 KiB
Go
110 lines
3.0 KiB
Go
package 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/util/log"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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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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NotificationInputs = append(NotificationInputs, &GooglePubSubInput{})
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}
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type GooglePubSubInput struct {
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sub *pubsub.Subscription
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topicName string
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messageChan chan *pubsub.Message
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}
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func (k *GooglePubSubInput) GetName() string {
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return "google_pub_sub"
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}
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func (k *GooglePubSubInput) Initialize(configuration util.Configuration, prefix string) error {
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log.Infof("notification.google_pub_sub.project_id: %v", configuration.GetString(prefix+"project_id"))
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log.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 *GooglePubSubInput) 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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log.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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log.Fatalf("Failed to create client: %v", err)
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}
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k.topicName = topicName
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topic := client.Topic(topicName)
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if exists, err := topic.Exists(ctx); err == nil {
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if !exists {
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topic, err = client.CreateTopic(ctx, topicName)
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if err != nil {
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log.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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log.Fatalf("Failed to check topic %s: %v", topicName, err)
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}
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subscriptionName := "seaweedfs_sub"
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k.sub = client.Subscription(subscriptionName)
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if exists, err := k.sub.Exists(ctx); err == nil {
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if !exists {
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k.sub, err = client.CreateSubscription(ctx, subscriptionName, pubsub.SubscriptionConfig{Topic: topic})
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if err != nil {
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log.Fatalf("Failed to create subscription %s: %v", subscriptionName, err)
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}
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}
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} else {
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log.Fatalf("Failed to check subscription %s: %v", topicName, err)
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}
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k.messageChan = make(chan *pubsub.Message, 1)
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go k.sub.Receive(ctx, func(ctx context.Context, m *pubsub.Message) {
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k.messageChan <- m
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m.Ack()
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})
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return err
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}
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func (k *GooglePubSubInput) ReceiveMessage() (key string, message *filer_pb.EventNotification, err error) {
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m := <-k.messageChan
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// process the message
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key = m.Attributes["key"]
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message = &filer_pb.EventNotification{}
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err = proto.Unmarshal(m.Data, message)
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if err != nil {
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err = fmt.Errorf("unmarshal message from google pubsub %s: %v", k.topicName, err)
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return
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}
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return
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}
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