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rlp: fixes for two corner cases and documentation (#19527)

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These changes fix two corner cases related to internal handling of types
in package rlp: The "tail" struct tag can only be applied to the last field.
The check for this was wrong and didn't allow for private fields after the
field with the tag. Unsupported types (e.g. structs containing int) which
implement either the Encoder or Decoder interface but not both 
couldn't be encoded/decoded.

Also fixes #19367
This commit is contained in:
Felix Lange
2019-05-14 15:09:56 +02:00
committed by GitHub
parent 184af72e4e
commit 8deec2e45a
5 changed files with 111 additions and 57 deletions
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30
rlp/decode.go
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@ -115,15 +115,17 @@ type Decoder interface {
// type, Decode will return an error. Decode also supports *big.Int.
// There is no size limit for big integers.
//
// To decode into a boolean, the input must contain an unsigned integer
// of value zero (false) or one (true).
//
// To decode into an interface value, Decode stores one of these
// in the value:
//
// []interface{}, for RLP lists
// []byte, for RLP strings
//
// Non-empty interface types are not supported, nor are booleans,
// signed integers, floating point numbers, maps, channels and
// functions.
// Non-empty interface types are not supported, nor are signed integers,
// floating point numbers, maps, channels and functions.
//
// Note that Decode does not set an input limit for all readers
// and may be vulnerable to panics cause by huge value sizes. If
@ -306,9 +308,9 @@ func makeListDecoder(typ reflect.Type, tag tags) (decoder, error) {
}
return decodeByteSlice, nil
}
etypeinfo, err := cachedTypeInfo1(etype, tags{})
if err != nil {
return nil, err
etypeinfo := cachedTypeInfo1(etype, tags{})
if etypeinfo.decoderErr != nil {
return nil, etypeinfo.decoderErr
}
var dec decoder
switch {
@ -467,9 +469,9 @@ func makeStructDecoder(typ reflect.Type) (decoder, error) {
// the pointer's element type.
func makePtrDecoder(typ reflect.Type) (decoder, error) {
etype := typ.Elem()
etypeinfo, err := cachedTypeInfo1(etype, tags{})
if err != nil {
return nil, err
etypeinfo := cachedTypeInfo1(etype, tags{})
if etypeinfo.decoderErr != nil {
return nil, etypeinfo.decoderErr
}
dec := func(s *Stream, val reflect.Value) (err error) {
newval := val
@ -491,9 +493,9 @@ func makePtrDecoder(typ reflect.Type) (decoder, error) {
// This decoder is used for pointer-typed struct fields with struct tag "nil".
func makeOptionalPtrDecoder(typ reflect.Type) (decoder, error) {
etype := typ.Elem()
etypeinfo, err := cachedTypeInfo1(etype, tags{})
if err != nil {
return nil, err
etypeinfo := cachedTypeInfo1(etype, tags{})
if etypeinfo.decoderErr != nil {
return nil, etypeinfo.decoderErr
}
dec := func(s *Stream, val reflect.Value) (err error) {
kind, size, err := s.Kind()
@ -814,12 +816,12 @@ func (s *Stream) Decode(val interface{}) error {
if rval.IsNil() {
return errDecodeIntoNil
}
info, err := cachedTypeInfo(rtyp.Elem(), tags{})
decoder, err := cachedDecoder(rtyp.Elem())
if err != nil {
return err
}
err = info.decoder(s, rval.Elem())
err = decoder(s, rval.Elem())
if decErr, ok := err.(*decodeError); ok && len(decErr.ctx) > 0 {
// add decode target type to error so context has more meaning
decErr.ctx = append(decErr.ctx, fmt.Sprint("(", rtyp.Elem(), ")"))