The problem is that os.NewFile makes a new File struct; it doesn't create a
file. Also, the first argument should be an open file descriptor, not a
flag. I think you want to use os.Create. You certainly don't want NewFile.
-rob
On Sat, Jun 15, 2019 at 12:21 AM <a...@cpu.host> wrote:
> I have been writing metrics to a NFS, then reading them from another
> server.
>
> In my unit tests everything works fine on a local disk, but not when I
> deploy.
>
> I was previously using JSON streams on NFS, (one object per line), but gob
> seems like the idiomatic solution.
>
> Since no errors were being thrown, and I just had empty files (my files
> should never be empty), I decided to try using os.NewFile with some other
> file descriptors rather than os.Create.
>
> Here is my code which catches the metrics and writes a new file every 5
> seconds if there is content.
>
> Basically I would like to know if there is a specific file descriptor to
> use for this scenario of streaming the data to the NFS.
>
> Thanks,
>
>
> func (client *Client) batchLogs() {
>
> var received int
>
> var file *os.File
> var enc *gob.Encoder
>
> for {
> t := time.After(5 * time.Second)
>
> for {
> select {
>
> case metric := <- client.batchQueue:
>
> if enc == nil {
> file = os.NewFile(
> syscall.O_ASYNC,
> fmt.Sprintf("%s/%s_%v.gobs", client.volumePath, client.clientID,
> time.Now().UTC().Unix()),
> )
> if file == nil {
> err := fmt.Errorf("FAILED TO MAKE NEW LOG FILE")
> fmt.Println(err)
> panic(err)
> }
> enc = gob.NewEncoder(file)
> }
>
> received++
> if err := metric.Serialise(enc); err != nil {
> panic(err)
> }
> continue
>
> case <- t:
>
> if file != nil {
> if err := file.Close(); err != nil {
> fmt.Println(err)
> }
> }
>
> enc = nil
> file = nil
>
> }
>
> break
> }
> }
>
> }
>
>
> --
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