support AWS SQS as file change notification message queue

weed/replication/sub/notification_aws_sqs.go

@@ -0,0 +1,111 @@
+package sub
+
+import (
+	"fmt"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/golang/protobuf/proto"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/sqs"
+	"github.com/aws/aws-sdk-go/aws/awserr"
+)
+
+func init() {
+	NotificationInputs = append(NotificationInputs, &AwsSqsInput{})
+}
+
+type AwsSqsInput struct {
+	svc      *sqs.SQS
+	queueUrl string
+}
+
+func (k *AwsSqsInput) GetName() string {
+	return "aws_sqs"
+}
+
+func (k *AwsSqsInput) Initialize(configuration util.Configuration) error {
+	glog.V(0).Infof("replication.notification.aws_sqs.region: %v", configuration.GetString("region"))
+	glog.V(0).Infof("replication.notification.aws_sqs.sqs_queue_name: %v", configuration.GetString("sqs_queue_name"))
+	return k.initialize(
+		configuration.GetString("aws_access_key_id"),
+		configuration.GetString("aws_secret_access_key"),
+		configuration.GetString("region"),
+		configuration.GetString("sqs_queue_name"),
+	)
+}
+
+func (k *AwsSqsInput) initialize(awsAccessKeyId, aswSecretAccessKey, region, queueName string) (err error) {
+
+	config := &aws.Config{
+		Region: aws.String(region),
+	}
+	if awsAccessKeyId != "" && aswSecretAccessKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(awsAccessKeyId, aswSecretAccessKey, "")
+	}
+
+	sess, err := session.NewSession(config)
+	if err != nil {
+		return fmt.Errorf("create aws session: %v", err)
+	}
+	k.svc = sqs.New(sess)
+
+	result, err := k.svc.GetQueueUrl(&sqs.GetQueueUrlInput{
+		QueueName: aws.String(queueName),
+	})
+	if err != nil {
+		if aerr, ok := err.(awserr.Error); ok && aerr.Code() == sqs.ErrCodeQueueDoesNotExist {
+			return fmt.Errorf("unable to find queue %s", queueName)
+		}
+		return fmt.Errorf("get queue %s url: %v", queueName, err)
+	}
+
+	k.queueUrl = *result.QueueUrl
+
+	return nil
+}
+
+func (k *AwsSqsInput) ReceiveMessage() (key string, message *filer_pb.EventNotification, err error) {
+
+	// receive message
+	result, err := k.svc.ReceiveMessage(&sqs.ReceiveMessageInput{
+		AttributeNames: []*string{
+			aws.String(sqs.MessageSystemAttributeNameSentTimestamp),
+		},
+		MessageAttributeNames: []*string{
+			aws.String(sqs.QueueAttributeNameAll),
+		},
+		QueueUrl:            &k.queueUrl,
+		MaxNumberOfMessages: aws.Int64(1),
+		VisibilityTimeout:   aws.Int64(20), // 20 seconds
+		WaitTimeSeconds:     aws.Int64(20),
+	})
+	if err != nil {
+		err = fmt.Errorf("receive message from sqs %s: %v", k.queueUrl, err)
+		return
+	}
+	if len(result.Messages) == 0 {
+		return
+	}
+
+	// process the message
+	key = *result.Messages[0].Attributes["key"]
+	text := *result.Messages[0].Body
+	message = &filer_pb.EventNotification{}
+	err = proto.UnmarshalText(text, message)
+
+	// delete the message
+	_, err = k.svc.DeleteMessage(&sqs.DeleteMessageInput{
+		QueueUrl:      &k.queueUrl,
+		ReceiptHandle: result.Messages[0].ReceiptHandle,
+	})
+
+	if err != nil {
+		glog.V(1).Infof("delete message from sqs %s: %v", k.queueUrl, err)
+	}
+
+	return
+}