On Wed, Aug 23, 2023 at 6:37 AM Phillip Siessl <phillip.sie...@gmx.at>
wrote:
> Hi
>
> i have some issues when i try to download a larger zip file (5GB) via the
> sftp package in go.
> about 20% of the time it runs through smoothly but the other 80% i get a
> panic with
> "fatal error: concurrent map writes writing to file" or "fatal error:
> concurrent map read and map write".
>
There are no map operations in the code you included. The error is
happening somewhere else. The panic should include enough information to
tell where it is coming from.
>
> this is the code for the download function:
>
> func DownloadZip(sc sftp.Client, remoteFile, localFile string) (err error)
> {
>
> fmt.Fprintf(os.Stdout, "Downloading [%s] to [%s] ...\n", remoteFile,
> localFile)
> srcFile, err := sc.OpenFile(remoteFile, (os.O_RDONLY))
> if err != nil {
> fmt.Fprintf(os.Stderr, "Unable to open remote file: %v\n", err)
> return
> }
>
> defer srcFile.Close()
> fmt.Println("Create locale file")
> dstFile, err := os.Create(localFile)
> if err != nil {
> fmt.Fprintf(os.Stderr, "Unable to open local file: %v\n", err)
> return
> }
> defer dstFile.Close()
> fmt.Println("Copy remote file")
> bytes, err := io.Copy(dstFile, srcFile)
> if err != nil {
> fmt.Fprintf(os.Stderr, "Unable to download remote file: %v\n", err)
> os.Exit(1)
> }
> fmt.Println("Save local file")
> fmt.Fprintf(os.Stdout, "%d bytes copied\n", bytes)
>
> return
> }
>
>
> If anybody has some ideas i would be very happy. thx
>
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