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package fmsg
import (
"fmt"
"log"
"reflect"
"strings"
)
// baseError implements a basic error container
type baseError struct {
Err error
}
func (e *baseError) Error() string {
return e.Err.Error()
}
func (e *baseError) Unwrap() error {
return e.Err
}
// BaseError implements an error container with a user-facing message
type BaseError struct {
message string
baseError
}
// Message returns a user-facing error message
func (e *BaseError) Message() string {
return e.message
}
// WrapError wraps an error with a corresponding message.
func WrapError(err error, a ...any) error {
if err == nil {
return nil
}
return wrapError(err, fmt.Sprintln(a...))
}
// WrapErrorSuffix wraps an error with a corresponding message with err at the end of the message.
func WrapErrorSuffix(err error, a ...any) error {
if err == nil {
return nil
}
return wrapError(err, fmt.Sprintln(append(a, err)...))
}
// WrapErrorFunc wraps an error with a corresponding message returned by f.
func WrapErrorFunc(err error, f func(err error) string) error {
if err == nil {
return nil
}
return wrapError(err, f(err))
}
func wrapError(err error, message string) *BaseError {
return &BaseError{message, baseError{err}}
}
var (
baseErrorType = reflect.TypeFor[*BaseError]()
)
func AsBaseError(err error, target **BaseError) bool {
v := reflect.ValueOf(err)
if !v.CanConvert(baseErrorType) {
return false
}
*target = v.Convert(baseErrorType).Interface().(*BaseError)
return true
}
func PrintBaseError(err error, fallback string) {
var e *BaseError
if AsBaseError(err, &e) {
if msg := e.Message(); strings.TrimSpace(msg) != "" {
log.Print(msg)
return
}
Verbose("*"+fallback, err)
return
}
log.Println(fallback, err)
}
|
