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package 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")
}
var kvs []kv
if e := AsV2[*errWithValues](err); e != nil {
kvs = e.kvs
}
return &errWithValues{
err: err,
kvs: append(kvs, kv{key, value}),
}
}
// Value searches for value stored under given key in error chain.
func Value(err error, key any) any {
if e := AsV2[*errWithValues](err); e != nil {
return e.Value(key)
}
return nil
}
// simple key-value type.
type kv struct{ k, v any }
// errWithValues wraps an error to provide key-value storage.
type errWithValues struct {
err error
kvs []kv
}
func (e *errWithValues) Error() string {
return e.err.Error()
}
func (e *errWithValues) Unwrap() error {
return e.err
}
func (e *errWithValues) Value(key any) any {
for i := range e.kvs {
if e.kvs[i].k == key {
return e.kvs[i].v
}
}
return nil
}
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