40 lines
897 B
Go
40 lines
897 B
Go
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package catalog
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import "errors"
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var (
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ErrSystemImmutable = errors.New("system records cannot be modified or deleted")
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ErrNotFound = errors.New("not found")
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)
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// clientError is a validation/business message safe to return to API clients.
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type clientError struct {
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msg string
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}
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func (e *clientError) Error() string { return e.msg }
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// ClientMsg marks a message as safe to expose in HTTP 4xx responses.
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func ClientMsg(msg string) error {
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return &clientError{msg: msg}
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}
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// ClientError reports whether err is a known client-facing catalog error.
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func ClientError(err error) (msg string, ok bool) {
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if err == nil {
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return "", false
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}
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var ce *clientError
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if errors.As(err, &ce) {
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return ce.msg, true
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}
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switch {
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case errors.Is(err, ErrNotFound):
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return "not found", true
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case errors.Is(err, ErrSystemImmutable):
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return err.Error(), true
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default:
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return "", false
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}
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}
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