Golang : Upload to S3 with official aws-sdk-go package



Tags : golang AWS-SDK-GO putobject upload download

An update to my previous tutorial on how to upload data to AWS S3, this tutorial uses the "official" AWS-SDK-GO package. As usual, please take note the the AWS-SDK-GO is still underdevelopment and the code example below might become obsolete. At the time of writing, it is working perfectly.

Here you go!

 package main

 import (
 "bytes"
 "fmt"
 "github.com/aws/aws-sdk-go/aws"
 "github.com/aws/aws-sdk-go/aws/awserr"
 "github.com/aws/aws-sdk-go/aws/awsutil"
 "github.com/aws/aws-sdk-go/aws/credentials"
 "github.com/aws/aws-sdk-go/service/s3"
 "net/http"
 "os"
 )

 func main() {

 // DO NOT PUT credentials in code for production usage!
 // see https://www.socketloop.com/tutorials/golang-setting-up-configure-aws-credentials-with-official-aws-sdk-go
 // on setting creds from environment or loading from file

 // the file location and load default profile
 creds := credentials.NewSharedCredentials("/<change this>/.aws/credentials", "default")

 _, err := creds.Get()

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 aws.DefaultConfig.Region = "us-east-1" //<--- change this to yours

 config := &aws.Config{
 Region: "",
 Endpoint: "s3.amazonaws.com", // <-- forking important !
 S3ForcePathStyle: true, // <-- without these lines. All will fail! fork you aws!
 Credentials: creds,
 LogLevel: 0, // <-- feel free to crank it up 
 }

 s3client := s3.New(config)

 bucketName := "<change>" // <-- change this to your bucket name

 fileToUpload := "<change>"

 file, err := os.Open(fileToUpload)

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 defer file.Close()

 fileInfo, _ := file.Stat()
 var size int64 = fileInfo.Size()

 buffer := make([]byte, size)

 // read file content to buffer
 file.Read(buffer)

 fileBytes := bytes.NewReader(buffer) // convert to io.ReadSeeker type

 fileType := http.DetectContentType(buffer)

 path := "/examplefolder/" + file.Name() // target file and location in S3

 params := &s3.PutObjectInput{
 Bucket: aws.String(bucketName), // required
 Key: aws.String(path), // required
 ACL: aws.String("public-read"),
 Body: fileBytes,
 ContentLength: aws.Long(size),
 ContentType: aws.String(fileType),
 Metadata: map[string]*string{
 "Key": aws.String("MetadataValue"), //required
 },
 // see more at http://godoc.org/github.com/aws/aws-sdk-go/service/s3#S3.PutObject
 }

 result, err := s3client.PutObject(params)

 if err != nil {
 if awsErr, ok := err.(awserr.Error); ok {
 // Generic AWS Error with Code, Message, and original error (if any)
 fmt.Println(awsErr.Code(), awsErr.Message(), awsErr.OrigErr())
 if reqErr, ok := err.(awserr.RequestFailure); ok {
 // A service error occurred
 fmt.Println(reqErr.Code(), reqErr.Message(), reqErr.StatusCode(), reqErr.RequestID())
 }
 } else {
 // This case should never be hit, the SDK should always return an
 // error which satisfies the awserr.Error interface.
 fmt.Println(err.Error())
 }
 }

 fmt.Println(awsutil.StringValue(result))
 }

Sample output :

...

Content-Type: application/zip

X-Amz-Acl: public-read

X-Amz-Content-Sha256: b39a762d032dd518aacf51cbee2a70a3bc90e24ceddc6cd3c94d29b0882beaa0

X-Amz-Date: 20150610T084114Z

X-Amz-Meta-Key: MetadataValue

Accept-Encoding: gzip


---[ RESPONSE ]--------------------------------------

HTTP/1.1 200 OK


{

ETag: "\"04f9ed14026972f61407e98b0cbe6445\""

}

References :

https://www.socketloop.com/tutorials/golang-upload-and-download-file-to-from-aws-s3

http://godoc.org/github.com/aws/aws-sdk-go/service/s3#S3.PutObject

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  See also : Golang : Create S3 bucket with official aws-sdk-go package



Tags : golang AWS-SDK-GO putobject upload download

By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


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