On Friday, August 24, 2018 at 11:20:46 AM UTC+2, Paweł Szczur wrote:
>
> Hi,
>
> I have a long running hobby program with a code:
>
> var (
> url = "https://example.com";
> lastBody []byte
> )
>
>
> func get(client *http.Client, dir) (changed bool, data []byte, err error) {
>
> resp, err := client.Get(url)
> if err != nil {
> return false, nil, err
> }
> if resp.StatusCode != http.StatusOK {
> log.Printf("status code: %d", resp.StatusCode)
> return false, nil, nil
> }
> body, err := ioutil.ReadAll(resp.Body)
> if err != nil {
> return false, nil, err
> }
> if bytes.Compare(body, lastBody) == 0 {
> logrus.Info("data is equal")
> return false, data, nil
> }
>
> lastBody = body
> log.Printf("got %dB data", len(body))
>
> dir = path.Join(dir, t.Format("2006/01/02"))
> if err = os.MkdirAll(dir, defaultDirPerm); err != nil {
> log.Print("failed to create a dir")
> }
>
>
Here, if os.MkdirAll fails, the function should return with an error.
p := path.Join(dir, fmt.Sprintf("%d.json", t.Unix()))
>
> return true, body, ioutil.WriteFile(p, body, 0640)
> }
>
>
Also, you should probably pass lastBody as a function argument, and not as
a global variable.
The variable t is also not defined in the code you posted.
>
>
After around 14 days the process stops writing files. However, it executes
> os.WriteFile and does not return any error.
> The function is called repeatedly every N second (~40-60sec.). It produces
> around 1700 files a day.
>
>
The problem may be triggered when the code fails to create a new directory;
however WriteFile should return an error in this case.
> [...]
Manlio
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