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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
pull/19578/head
Felix Lange 6 years ago committed by GitHub
parent 184af72e4e
commit 8deec2e45a
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 111 additions and 57 deletions
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  1. 30
      rlp/decode.go
  2. 32
      rlp/decode_test.go
  3. 28
      rlp/encode.go
  4. 9
      rlp/encode_test.go
  5. 67
      rlp/typecache.go

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(), ")"))

32
rlp/decode_test.go
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@ -347,6 +347,12 @@ type tailUint struct {
Tail []uint `rlp:"tail"`
}
type tailPrivateFields struct {
A uint
Tail []uint `rlp:"tail"`
x, y bool
}
var (
veryBigInt = big.NewInt(0).Add(
big.NewInt(0).Lsh(big.NewInt(0xFFFFFFFFFFFFFF), 16),
@ -510,6 +516,11 @@ var decodeTests = []decodeTest{
ptr: new(tailRaw),
value: tailRaw{A: 1, Tail: []RawValue{}},
},
{
input: "C3010203",
ptr: new(tailPrivateFields),
value: tailPrivateFields{A: 1, Tail: []uint{2, 3}},
},
// struct tag "-"
{
@ -691,6 +702,27 @@ func TestDecoderInByteSlice(t *testing.T) {
}
}
type unencodableDecoder func()
func (f *unencodableDecoder) DecodeRLP(s *Stream) error {
if _, err := s.List(); err != nil {
return err
}
if err := s.ListEnd(); err != nil {
return err
}
*f = func() {}
return nil
}
func TestDecoderFunc(t *testing.T) {
var x func()
if err := DecodeBytes([]byte{0xC0}, (*unencodableDecoder)(&x)); err != nil {
t.Fatal(err)
}
x()
}
func ExampleDecode() {
input, _ := hex.DecodeString("C90A1486666F6F626172")

28
rlp/encode.go
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@ -73,10 +73,12 @@ type Encoder interface {
// An unsigned integer value is encoded as an RLP string. Zero always
// encodes as an empty RLP string. Encode also supports *big.Int.
//
// Boolean values are encoded as unsigned integers zero (false) and one (true).
//
// An interface value encodes as the value contained in the interface.
//
// Boolean values are not supported, nor are signed integers, floating
// point numbers, maps, channels and functions.
// Signed integers are not supported, nor are floating point numbers, maps,
// channels and functions.
func Encode(w io.Writer, val interface{}) error {
if outer, ok := w.(*encbuf); ok {
// Encode was called by some type's EncodeRLP.
@ -180,11 +182,11 @@ func (w *encbuf) Write(b []byte) (int, error) {
func (w *encbuf) encode(val interface{}) error {
rval := reflect.ValueOf(val)
ti, err := cachedTypeInfo(rval.Type(), tags{})
writer, err := cachedWriter(rval.Type())
if err != nil {
return err
}
return ti.writer(rval, w)
return writer(rval, w)
}
func (w *encbuf) encodeStringHeader(size int) {
@ -497,17 +499,17 @@ func writeInterface(val reflect.Value, w *encbuf) error {
return nil
}
eval := val.Elem()
ti, err := cachedTypeInfo(eval.Type(), tags{})
writer, err := cachedWriter(eval.Type())
if err != nil {
return err
}
return ti.writer(eval, w)
return writer(eval, w)
}
func makeSliceWriter(typ reflect.Type, ts tags) (writer, error) {
etypeinfo, err := cachedTypeInfo1(typ.Elem(), tags{})
if err != nil {
return nil, err
etypeinfo := cachedTypeInfo1(typ.Elem(), tags{})
if etypeinfo.writerErr != nil {
return nil, etypeinfo.writerErr
}
writer := func(val reflect.Value, w *encbuf) error {
if !ts.tail {
@ -543,9 +545,9 @@ func makeStructWriter(typ reflect.Type) (writer, error) {
}
func makePtrWriter(typ reflect.Type) (writer, error) {
etypeinfo, err := cachedTypeInfo1(typ.Elem(), tags{})
if err != nil {
return nil, err
etypeinfo := cachedTypeInfo1(typ.Elem(), tags{})
if etypeinfo.writerErr != nil {
return nil, etypeinfo.writerErr
}
// determine nil pointer handler
@ -577,7 +579,7 @@ func makePtrWriter(typ reflect.Type) (writer, error) {
}
return etypeinfo.writer(val.Elem(), w)
}
return writer, err
return writer, nil
}
// putint writes i to the beginning of b in big endian byte

9
rlp/encode_test.go
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@ -49,6 +49,13 @@ func (e byteEncoder) EncodeRLP(w io.Writer) error {
return nil
}
type undecodableEncoder func()
func (f undecodableEncoder) EncodeRLP(w io.Writer) error {
_, err := w.Write(EmptyList)
return err
}
type encodableReader struct {
A, B uint
}
@ -239,6 +246,8 @@ var encTests = []encTest{
{val: (*testEncoder)(nil), output: "00000000"},
{val: &testEncoder{}, output: "00010001000100010001"},
{val: &testEncoder{errors.New("test error")}, error: "test error"},
// verify that the Encoder interface works for unsupported types like func().
{val: undecodableEncoder(func() {}), output: "C0"},
// verify that pointer method testEncoder.EncodeRLP is called for
// addressable non-pointer values.
{val: &struct{ TE testEncoder }{testEncoder{}}, output: "CA00010001000100010001"},

67
rlp/typecache.go
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@ -29,8 +29,10 @@ var (
)
type typeinfo struct {
decoder
writer
decoder decoder
decoderErr error // error from makeDecoder
writer writer
writerErr error // error from makeWriter
}
// represents struct tags
@ -56,12 +58,22 @@ type decoder func(*Stream, reflect.Value) error
type writer func(reflect.Value, *encbuf) error
func cachedTypeInfo(typ reflect.Type, tags tags) (*typeinfo, error) {
func cachedDecoder(typ reflect.Type) (decoder, error) {
info := cachedTypeInfo(typ, tags{})
return info.decoder, info.decoderErr
}
func cachedWriter(typ reflect.Type) (writer, error) {
info := cachedTypeInfo(typ, tags{})
return info.writer, info.writerErr
}
func cachedTypeInfo(typ reflect.Type, tags tags) *typeinfo {
typeCacheMutex.RLock()
info := typeCache[typekey{typ, tags}]
typeCacheMutex.RUnlock()
if info != nil {
return info, nil
return info
}
// not in the cache, need to generate info for this type.
typeCacheMutex.Lock()
@ -69,25 +81,20 @@ func cachedTypeInfo(typ reflect.Type, tags tags) (*typeinfo, error) {
return cachedTypeInfo1(typ, tags)
}
func cachedTypeInfo1(typ reflect.Type, tags tags) (*typeinfo, error) {
func cachedTypeInfo1(typ reflect.Type, tags tags) *typeinfo {
key := typekey{typ, tags}
info := typeCache[key]
if info != nil {
// another goroutine got the write lock first
return info, nil
return info
}
// put a dummy value into the cache before generating.
// if the generator tries to lookup itself, it will get
// the dummy value and won't call itself recursively.
typeCache[key] = new(typeinfo)
info, err := genTypeInfo(typ, tags)
if err != nil {
// remove the dummy value if the generator fails
delete(typeCache, key)
return nil, err
}
*typeCache[key] = *info
return typeCache[key], err
info = new(typeinfo)
typeCache[key] = info
info.generate(typ, tags)
return info
}
type field struct {
@ -96,26 +103,24 @@ type field struct {
}
func structFields(typ reflect.Type) (fields []field, err error) {
lastPublic := lastPublicField(typ)
for i := 0; i < typ.NumField(); i++ {
if f := typ.Field(i); f.PkgPath == "" { // exported
tags, err := parseStructTag(typ, i)
tags, err := parseStructTag(typ, i, lastPublic)
if err != nil {
return nil, err
}
if tags.ignored {
continue
}
info, err := cachedTypeInfo1(f.Type, tags)
if err != nil {
return nil, err
}
info := cachedTypeInfo1(f.Type, tags)
fields = append(fields, field{i, info})
}
}
return fields, nil
}
func parseStructTag(typ reflect.Type, fi int) (tags, error) {
func parseStructTag(typ reflect.Type, fi, lastPublic int) (tags, error) {
f := typ.Field(fi)
var ts tags
for _, t := range strings.Split(f.Tag.Get("rlp"), ",") {
@ -127,7 +132,7 @@ func parseStructTag(typ reflect.Type, fi int) (tags, error) {
ts.nilOK = true
case "tail":
ts.tail = true
if fi != typ.NumField()-1 {
if fi != lastPublic {
return ts, fmt.Errorf(`rlp: invalid struct tag "tail" for %v.%s (must be on last field)`, typ, f.Name)
}
if f.Type.Kind() != reflect.Slice {
@ -140,15 +145,19 @@ func parseStructTag(typ reflect.Type, fi int) (tags, error) {
return ts, nil
}
func genTypeInfo(typ reflect.Type, tags tags) (info *typeinfo, err error) {
info = new(typeinfo)
if info.decoder, err = makeDecoder(typ, tags); err != nil {
return nil, err
func lastPublicField(typ reflect.Type) int {
last := 0
for i := 0; i < typ.NumField(); i++ {
if typ.Field(i).PkgPath == "" {
last = i
}
if info.writer, err = makeWriter(typ, tags); err != nil {
return nil, err
}
return info, nil
return last
}
func (i *typeinfo) generate(typ reflect.Type, tags tags) {
i.decoder, i.decoderErr = makeDecoder(typ, tags)
i.writer, i.writerErr = makeWriter(typ, tags)
}
func isUint(k reflect.Kind) bool {

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