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package errors
import "errors"
// WithValue wraps err to store given key-value pair, accessible via Value() function.
func WithValue(err error, key any, value any) error {
if err == nil {
panic("nil error")
}
return &errWithValue{
err: err,
key: key,
val: value,
}
}
// Value searches for value stored under given key in error chain.
func Value(err error, key any) any {
var e *errWithValue
if !errors.As(err, &e) {
return nil
}
return e.Value(key)
}
type errWithValue struct {
err error
key any
val any
}
func (e *errWithValue) Error() string {
return e.err.Error()
}
func (e *errWithValue) Is(target error) bool {
return e.err == target
}
func (e *errWithValue) Unwrap() error {
return Unwrap(e.err)
}
func (e *errWithValue) Value(key any) any {
for {
if key == e.key {
return e.val
}
if !errors.As(e.err, &e) {
return nil
}
}
}
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