Stream file upload to AWS S3 using go

You can use upload manager to stream the file and upload it, you can read comments in source code you can also configure params to set the part size, concurrency & max upload parts, below is a sample code for reference.

package main

import (
    "fmt"
    "os"

    "github.com/aws/aws-sdk-go/aws/credentials"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/s3/s3manager"
)

var filename = "file_name.zip"
var myBucket = "myBucket"
var myKey = "file_name.zip"
var accessKey = ""
var accessSecret = ""

func main() {
    var awsConfig *aws.Config
    if accessKey == "" || accessSecret == "" {
        //load default credentials
        awsConfig = &aws.Config{
            Region: aws.String("us-west-2"),
        }
    } else {
        awsConfig = &aws.Config{
            Region:      aws.String("us-west-2"),
            Credentials: credentials.NewStaticCredentials(accessKey, accessSecret, ""),
        }
    }

    // The session the S3 Uploader will use
    sess := session.Must(session.NewSession(awsConfig))

    // Create an uploader with the session and default options
    //uploader := s3manager.NewUploader(sess)

    // Create an uploader with the session and custom options
    uploader := s3manager.NewUploader(sess, func(u *s3manager.Uploader) {
        u.PartSize = 5 * 1024 * 1024 // The minimum/default allowed part size is 5MB
        u.Concurrency = 2            // default is 5
    })

    //open the file
    f, err := os.Open(filename)
    if err != nil {
        fmt.Printf("failed to open file %q, %v", filename, err)
        return
    }
    //defer f.Close()

    // Upload the file to S3.
    result, err := uploader.Upload(&s3manager.UploadInput{
        Bucket: aws.String(myBucket),
        Key:    aws.String(myKey),
        Body:   f,
    })

    //in case it fails to upload
    if err != nil {
        fmt.Printf("failed to upload file, %v", err)
        return
    }
    fmt.Printf("file uploaded to, %s\n", result.Location)
}

you can do this using minio-go :

n, err := s3Client.PutObject("bucket-name", "objectName", object, size, "application/octet-stream")

PutObject() automatically does multipart upload internally. Example