seaweedfs/weed/notification/gocdk_pub_sub/gocdk_pub_sub.go

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// Package gocdk_pub_sub supports the Go CDK (Cloud Development Kit) PubSub API,
// which in turn supports many providers, including Amazon SNS/SQS, Azure Service Bus,
// Google Cloud PubSub, and RabbitMQ.
//
// In the config, select a provider and topic using a URL. See
// https://godoc.org/gocloud.dev/pubsub and its sub-packages for details.
//
// The Go CDK PubSub API does not support administrative operations like topic
// creation. Create the topic using a UI, CLI or provider-specific API before running
// weed.
//
// The Go CDK obtains credentials via environment variables and other
// provider-specific default mechanisms. See the provider's documentation for
// details.
package gocdk_pub_sub
import (
"context"
"fmt"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/notification"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/golang/protobuf/proto"
"gocloud.dev/pubsub"
_ "gocloud.dev/pubsub/awssnssqs"
_ "gocloud.dev/pubsub/azuresb"
_ "gocloud.dev/pubsub/gcppubsub"
_ "gocloud.dev/pubsub/natspubsub"
_ "gocloud.dev/pubsub/rabbitpubsub"
)
func init() {
notification.MessageQueues = append(notification.MessageQueues, &GoCDKPubSub{})
}
type GoCDKPubSub struct {
topicURL string
topic *pubsub.Topic
}
func (k *GoCDKPubSub) GetName() string {
return "gocdk_pub_sub"
}
func (k *GoCDKPubSub) Initialize(config util.Configuration) error {
k.topicURL = config.GetString("topic_url")
glog.V(0).Infof("notification.gocdk_pub_sub.topic_url: %v", k.topicURL)
topic, err := pubsub.OpenTopic(context.Background(), k.topicURL)
if err != nil {
glog.Fatalf("Failed to open topic: %v", err)
}
k.topic = topic
return nil
}
func (k *GoCDKPubSub) SendMessage(key string, message proto.Message) error {
bytes, err := proto.Marshal(message)
if err != nil {
return err
}
ctx := context.Background()
err = k.topic.Send(ctx, &pubsub.Message{
Body: bytes,
Metadata: map[string]string{"key": key},
})
if err != nil {
return fmt.Errorf("send message via Go CDK pubsub %s: %v", k.topicURL, err)
}
return nil
}