Uploading Files to AWS S3 using Go
development golang awsIn order to work with AWS S3 using Go, we will use github.com/aws/aws-sdk-go/aws. In this gist, we will use the aws-sdk-go package to upload files under a given directory. The complete source code for the snippet is available here https://github.com/abvarun226/blog-source-code/tree/master/uploading-files-to-aws-s3-using-go
In order to test the snippet, we will use localstack to run s3 emulator in a docker container on the laptop. The container exposes s3 endpoint on port 4566. The snippet will then create a new bucket work-with-s3 in s3. The snippet will then upload couple of files to blog directory under work-with-s3 bucket.
In order to start the localstack container, run:
$ docker-compose up --build --remove-orphans -d
In order to stop the container, run:
$ docker-compose down --remove-orphans
package main
import (
"log"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
)
func main() {
bucket := "work-with-s3"
conf := aws.NewConfig().
WithRegion("us-west-2").
WithEndpoint("http://127.0.0.1:4566").
WithS3ForcePathStyle(true)
sess, err := session.NewSession(conf)
if err != nil {
log.Fatalf("failed to create a new aws session: %v", sess)
}
s3client := s3.New(sess)
// create a new s3 bucket.
if _, err := s3client.CreateBucket(&s3.CreateBucketInput{Bucket: aws.String(bucket)}); err != nil {
if aerr, ok := err.(awserr.Error); ok && aerr.Code() != "Conflict" && aerr.Code() != "BucketAlreadyOwnedByYou" {
log.Fatalf("failed to create a new s3 bucket: %v", err)
}
}
// upload couple of files to s3 bucket we just created.
if err := uploadFile(sess, bucket, "blog/file1.txt", "this is file 1"); err != nil {
log.Fatalf("failed to upload file: %v", err)
}
if err := uploadFile(sess, bucket, "blog/file2.txt", "this is file 2"); err != nil {
log.Fatalf("failed to upload file: %v", err)
}
}
func uploadFile(sess *session.Session, bucket, s3path, content string) error {
uploader := s3manager.NewUploader(sess)
_, err := uploader.Upload(&s3manager.UploadInput{
Bucket: aws.String(bucket),
Key: aws.String(s3path),
Body: strings.NewReader(content),
})
return err
}
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