go - How check error codes with couchbase gocb? -

when handling errors returned gocb (the official couchbase go client) check specific status codes (e.g. statuskeynotfound or statuskeyexists).

like so

_, err := bucket.get(key, entity) if err != nil {     if err == gocb.errkeynotfound {         ...     } } 

can done?

can done?

in gocbcore, error.go have following definition:

type memderror struct {     code statuscode }  // ...  func (e memderror) keynotfound() bool {     return e.code == statuskeynotfound } func (e memderror) keyexists() bool {     return e.code == statuskeyexists } func (e memderror) temporary() bool {     return e.code == statusoutofmemory || e.code == statustmpfail } func (e memderror) autherror() bool {     return e.code == statusautherror } func (e memderror) valuetoobig() bool {     return e.code == statustoobig } func (e memderror) notstored() bool {     return e.code == statusnotstored } func (e memderror) baddelta() bool {     return e.code == statusbaddelta } 

note memderror unexported, can't use in type assertion.

so, take different approach: define own interface:

type myerrorinterface interface {     keynotfound() bool     keyexists() bool } 

and assert whatever error gocb interface:

_, err := bucket.get(key, entity)  if err != nil {     if se, ok = err.(myerrorinterface); ok {         if se.keynotfound() {             // handle keynotfound         }         if se.keyexists() {             // handle keyexists         }     } else {         // no information states     } }