seaweedfs/weed/replication/sub/notification_google_pub_sub.go

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package sub
import (
"context"
"fmt"
"os"
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"cloud.google.com/go/pubsub"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/util"
"google.golang.org/api/option"
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"google.golang.org/protobuf/proto"
)
func init() {
NotificationInputs = append(NotificationInputs, &GooglePubSubInput{})
}
type GooglePubSubInput struct {
sub *pubsub.Subscription
topicName string
messageChan chan *pubsub.Message
}
func (k *GooglePubSubInput) GetName() string {
return "google_pub_sub"
}
func (k *GooglePubSubInput) Initialize(configuration util.Configuration, prefix string) 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 *GooglePubSubInput) 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.topicName = topicName
topic := client.Topic(topicName)
if exists, err := topic.Exists(ctx); err == nil {
if !exists {
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)
}
subscriptionName := "seaweedfs_sub"
k.sub = client.Subscription(subscriptionName)
if exists, err := k.sub.Exists(ctx); err == nil {
if !exists {
k.sub, err = client.CreateSubscription(ctx, subscriptionName, pubsub.SubscriptionConfig{Topic: topic})
if err != nil {
glog.Fatalf("Failed to create subscription %s: %v", subscriptionName, err)
}
}
} else {
glog.Fatalf("Failed to check subscription %s: %v", topicName, err)
}
k.messageChan = make(chan *pubsub.Message, 1)
go k.sub.Receive(ctx, func(ctx context.Context, m *pubsub.Message) {
k.messageChan <- m
})
return err
}
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func (k *GooglePubSubInput) ReceiveMessage() (key string, message *filer_pb.EventNotification, onSuccessFn func(), onFailureFn func(), err error) {
m := <-k.messageChan
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onSuccessFn = func() {
m.Ack()
}
onFailureFn = func() {
m.Nack()
}
// process the message
key = m.Attributes["key"]
message = &filer_pb.EventNotification{}
err = proto.Unmarshal(m.Data, message)
if err != nil {
err = fmt.Errorf("unmarshal message from google pubsub %s: %v", k.topicName, err)
return
}
return
}