Add s3SinkEndpoint option

Signed-off-by: Sho Okada <shokada3@gmail.com>

Author: shokada

sinks/interfaces.go

@@ -104,6 +104,8 @@ func ManufactureSink() (e EventSinkInterface) {
 			panic("s3 sink specified but s3SinkBucketDir not specified")
 		}
 
+		endpoint := viper.GetString("s3SinkEndpoint")
+
 		// By default the json is pushed to s3 in not flatenned rfc5424 write format
 		// The option to write to s3 is in the flattened json format which will help in
 		// using the data in redshift with least effort
@@ -124,7 +126,7 @@ func ManufactureSink() (e EventSinkInterface) {
 		bufferSize := viper.GetInt("s3SinkBufferSize")
 		overflow := viper.GetBool("s3SinkDiscardMessages")
 
-		s, err := NewS3Sink(accessKeyID, secretAccessKey, region, bucket, bucketDir, uploadInterval, overflow, bufferSize, outputFormat)
+		s, err := NewS3Sink(accessKeyID, secretAccessKey, region, bucket, bucketDir, uploadInterval, overflow, bufferSize, outputFormat, endpoint)
 		if err != nil {
 			panic(err.Error())
 		}

sinks/s3sink.go

@@ -54,12 +54,16 @@ type S3Sink struct {
 }
 
 // NewS3Sink is the factory method constructing a new S3Sink
-func NewS3Sink(awsAccessKeyID string, s3SinkSecretAccessKey string, s3SinkRegion string, s3SinkBucket string, s3SinkBucketDir string, s3SinkUploadInterval int, overflow bool, bufferSize int, outputFormat string) (*S3Sink, error) {
+func NewS3Sink(awsAccessKeyID string, s3SinkSecretAccessKey string, s3SinkRegion string, s3SinkBucket string, s3SinkBucketDir string, s3SinkUploadInterval int, overflow bool, bufferSize int, outputFormat string, s3SinkEndpoint string) (*S3Sink, error) {
 	awsConfig := &aws.Config{
 		Region:      aws.String(s3SinkRegion),
 		Credentials: credentials.NewStaticCredentials(awsAccessKeyID, s3SinkSecretAccessKey, ""),
 	}
 
+	if s3SinkEndpoint != "" {
+		awsConfig = awsConfig.WithEndpoint(s3SinkEndpoint)
+	}
+
 	awsConfig = awsConfig.WithCredentialsChainVerboseErrors(true)
 	sess, err := session.NewSession(awsConfig)
 	if err != nil {