CODEWITHSUNDEEP
goerror-handling
apuzyrevsky
apuzyrevsky

Reputation: 31

Is there possibility of getting additional data from err interface Go?

I just starting working with golang and errors handling inside it. I working with gophercloud SDK and the error interface implemented in the way that it is providing all necessary data for me.

Here is my code:

vol, err := volumes.Get(client, volumeID).Extract()
if err != nil {

    log.Printf("Error with getting volume from gophercloud/openstack: %s\n", err)
    http.Error(w, err.Error(), 404)
    return
}

and here is a data of error that I'm seeing in debug mode

enter image description here

As you can see on the screen there is an actual error code, is there a possibility to extract it from error variable to use in the http.Error() method?

Thank you.

Upvotes: 0

Views: 171

Answers (1)

kozmo
kozmo

Reputation: 4471

You can use errors.As (GoLang 1.13+):

type errorString struct {
    msg  string
    val  string
}

func (e *errorString) Error() string {
    return e.msg
}

func newError(msg, val string) error {
   return &errorString{msg, val}
}

func TestErrorAdditionalInfo(t *testing.T) {
   err := newError("MSG", "SOME_VAL")

   var es *errorString
   if errors.As(err, &es) {
       fmt.Printf("Err[msg: %s; val: %s]\n", es.msg, es.val)
   }
}

Upvotes: 1

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