If you want to use the s3manager Downloader to gain parallel/chunked downloads, you can use a temp buffer like so. The seek error your getting is because it's using a io.WriterAt interface for io and pipes can't seek when you chain commands together (at least that I know of).
https://gist.github.com/jboelter/ecfb08d6a18440ac16d93b5183aad207 buff := &aws.WriteAtBuffer{} s3dl := s3manager.NewDownloader(awsSession) n, err := s3dl.Download(buff, &s3.GetObjectInput{ Bucket: aws.String(bucket), Key: aws.String(key), }) if err != nil { fmt.Fprintln(os.Stderr, err) os.Exit(1) } n2, err := io.Copy(os.Stdout, bytes.NewReader(buff.Bytes())) On Thursday, June 30, 2016 at 10:21:50 AM UTC-7, Walter Garcia wrote: > > Excellent , this work fine > > I attach the final sample code > > s3Svc := s3.New(session.New(&aws.Config{Region: > aws.String("us-west-2")})) > > result, err := s3Svc.GetObject(&s3.GetObjectInput{ > Bucket: aws.String(bucket), > Key: aws.String(key), > }) > > if err != nil { > fmt.Fprintln(os.Stderr, err) > os.Exit(1) > } > > io.Copy(os.Stdout, result.Body) > result.Body.Close() > > Thanks so much > > > El jueves, 30 de junio de 2016, 0:53:31 (UTC-3), Joshua Boelter escribió: >> >> I've been tinkering w/ the AWS Go SDK to get used to it ... this is one >> method using the GetObject API; see the full gist for a working example >> >> https://gist.github.com/jboelter/6f5bd598673eb0e606f10660495fc175 >> >> >> s3Svc := s3.New(awsSession) >> >> result, err := s3Svc.GetObject(&s3.GetObjectInput{ >> Bucket: aws.String(bucket), >> Key: aws.String(key), >> }) >> >> if err != nil { >> fmt.Fprintln(os.Stderr, err) >> os.Exit(1) >> } >> >> n, err := io.Copy(os.Stdout, result.Body) >> result.Body.Close() >> >> >> >> On Wednesday, June 29, 2016 at 3:35:39 PM UTC-7, Walter Garcia wrote: >>> >>> Hello all. >>> >>> Im new using AWS SDK in go and Im need download file object from S3 to >>> Stdout and not create a file. >>> For example: >>> my_download_s3_program > file.txt >>> or >>> my_download_s3_program | tar >>> etc >>> >>> So, I can download to file, but I need stream on the fly to stdout, it's >>> possible? >>> >>> This example write a file: >>> ---------------------------------------------------------------------- >>> file, err := os.Create("download_file.txt") >>> if err != nil { >>> fmt.Println("Failed to create file", err) >>> os.Exit(4) >>> } >>> defer file.Close() >>> >>> key := path.Join(prefix, filename) >>> >>> downloader := >>> s3manager.NewDownloader(session.New(&aws.Config{Region: >>> aws.String("us-west-2")})) >>> numBytes, err := downloader.Download(f, >>> &s3.GetObjectInput{ >>> Bucket: aws.String(bucket), >>> Key: aws.String(key), >>> }) >>> if err != nil { >>> fmt.Println("Failed to download file", err) >>> os.Exit(5) >>> } >>> >>> fmt.Println("Downloaded file", file.Name(), numBytes, >>> "bytes") >>> >>> ---------------------------------------------------------------------- >>> >>> How can modify this example to stream to stdout? >>> >>> Well, thanks in advance. >>> >> -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
