See https://blog.golang.org/generate and
https://godoc.org/golang.org/x/tools/cmd/stringer for an example of a now
standard Go tool that seems to do what you want.
On Mon, May 4, 2020 at 9:30 PM Amarjeet Anand <sarvmar...@gmail.com> wrote:
> Hi
>
> I want to declare a constant that maps an *ErrorCode*(string) like
> "100.01" to its *ErrorDescription*(string) like "Error description of
> 100.01".
> Declaring Error as *code* and *description* is helpful to monitor logs
> based based on *ErrorCode* and show the *ErrorDescription* to the client.
>
> Although go cannot create constant of type map, but it can be achieved in
> multiple ways.
>
> --------------------------------------------------------------------
> --------------------------------------------------------------------
> --------------------------------------------------------------------
> -------------
> One possible way can be :-
>
>
> type ErrorCode string
>
> const (
> E270_01 ErrorCode = "270.01"
> E270_02 = "270.02"
> )
>
> var ErrDescription = map[ErrorCode]string{
> E270_01: "this is error description",
> E270_02: "this is error description",
> }
>
> type LogErr struct {
> Code ErrorCode
> Description string
> }
>
> func getLogErr(e ErrorCode) LogErr {
> return LogErr{
> Code: e,
> Description: ErrDescription[e],
> }
> }
>
> func TestErrorConstant(t *testing.T) {
> fmt.Println(getLogErr(E270_01))
> }
>
>
>
> This solves our purpose. But the problem is for every new error, we need to
> change things at two places, (1) Declare const like E270_02 (2) Add an entry
> in the *ErrDescription* map
>
>
>
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Another possible way looks like :-
>
>
> type ErrorCode string
>
> const (
> E270_01 ErrorCode = "270.01:this is error description"
> E270_02 = "270.02:this is error description"
> )
>
> type LogErr struct {
> Code string
> Description string
> }
>
> func getLogErr(e ErrorCode) LogErr {
> * token := strings.Split(string(e), ":")*
> return LogErr{
> Code: token[0],
> Description: token[1],
> }
> }
>
> func TestErrorConstant(t *testing.T) {
> fmt.Println(getLogErr(E270_01))
> }
>
>
>
> This way looks promising, but don't really like the way of splitting string
> using ":"
>
>
>
>
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> I think best way could have been something like ---
>
> const (
> E270_01 ErrorCode = {"270.01", "this is error description"}
> )
>
>
>
> Since Golang doesn't support the Constant of struct, what could be your
> approach?
>
> Any suggestion is really appreciated.
>
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> .
>
--
Kurtis Rader
Caretaker of the exceptional canines Junior and Hank
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