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Patch for concurrent iterator & others (onto v1.11.6) #386

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roysc wants to merge 1565 commits from v1.11.6-statediff-v5 into master
pull from: v1.11.6-statediff-v5
merge into: cerc-io:master
Conversation 0 Commits 1565 Files Changed 1471 +2701 -474
25 changed files with 2701 additions and 474 deletions
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Showing only changes of commit 9b93564e21 - Show all commits

1
go.mod
View File

@ -67,6 +67,7 @@ require (
golang.org/x/sys v0.0.0-20210816183151-1e6c022a8912
golang.org/x/text v0.3.6
golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba
golang.org/x/tools v0.1.0
gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce
gopkg.in/olebedev/go-duktape.v3 v3.0.0-20200619000410-60c24ae608a6
gopkg.in/urfave/cli.v1 v1.20.0

2
go.sum
View File

@ -460,6 +460,7 @@ golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKG
golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/mod v0.4.2 h1:Gz96sIWK3OalVv/I/qNygP42zyoKp3xptRVCWRFEBvo=
golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@ -580,6 +581,7 @@ golang.org/x/tools v0.0.0-20191125144606-a911d9008d1f/go.mod h1:b+2E5dAYhXwXZwtn
golang.org/x/tools v0.0.0-20191216173652-a0e659d51361/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
golang.org/x/tools v0.0.0-20191227053925-7b8e75db28f4/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
golang.org/x/tools v0.0.0-20200108203644-89082a384178/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
golang.org/x/tools v0.1.0 h1:po9/4sTYwZU9lPhi1tOrb4hCv3qrhiQ77LZfGa2OjwY=
golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

180
rlp/decode.go
View File

@ -27,6 +27,8 @@ import (
"reflect"
"strings"
"sync"
"github.com/ethereum/go-ethereum/rlp/internal/rlpstruct"
)
//lint:ignore ST1012 EOL is not an error.
@ -148,7 +150,7 @@ var (
bigInt = reflect.TypeOf(big.Int{})
)
func makeDecoder(typ reflect.Type, tags tags) (dec decoder, err error) {
func makeDecoder(typ reflect.Type, tags rlpstruct.Tags) (dec decoder, err error) {
kind := typ.Kind()
switch {
case typ == rawValueType:
@ -220,55 +222,20 @@ func decodeBigIntNoPtr(s *Stream, val reflect.Value) error {
}
func decodeBigInt(s *Stream, val reflect.Value) error {
var buffer []byte
kind, size, err := s.Kind()
switch {
case err != nil:
return wrapStreamError(err, val.Type())
case kind == List:
return wrapStreamError(ErrExpectedString, val.Type())
case kind == Byte:
buffer = s.uintbuf[:1]
buffer[0] = s.byteval
s.kind = -1 // re-arm Kind
case size == 0:
// Avoid zero-length read.
s.kind = -1
case size <= uint64(len(s.uintbuf)):
// For integers smaller than s.uintbuf, allocating a buffer
// can be avoided.
buffer = s.uintbuf[:size]
if err := s.readFull(buffer); err != nil {
return wrapStreamError(err, val.Type())
}
// Reject inputs where single byte encoding should have been used.
if size == 1 && buffer[0] < 128 {
return wrapStreamError(ErrCanonSize, val.Type())
}
default:
// For large integers, a temporary buffer is needed.
buffer = make([]byte, size)
if err := s.readFull(buffer); err != nil {
return wrapStreamError(err, val.Type())
}
}
// Reject leading zero bytes.
if len(buffer) > 0 && buffer[0] == 0 {
return wrapStreamError(ErrCanonInt, val.Type())
}
// Set the integer bytes.
i := val.Interface().(*big.Int)
if i == nil {
i = new(big.Int)
val.Set(reflect.ValueOf(i))
}
i.SetBytes(buffer)
err := s.decodeBigInt(i)
if err != nil {
return wrapStreamError(err, val.Type())
}
return nil
}
func makeListDecoder(typ reflect.Type, tag tags) (decoder, error) {
func makeListDecoder(typ reflect.Type, tag rlpstruct.Tags) (decoder, error) {
etype := typ.Elem()
if etype.Kind() == reflect.Uint8 && !reflect.PtrTo(etype).Implements(decoderInterface) {
if typ.Kind() == reflect.Array {
@ -276,7 +243,7 @@ func makeListDecoder(typ reflect.Type, tag tags) (decoder, error) {
}
return decodeByteSlice, nil
}
etypeinfo := theTC.infoWhileGenerating(etype, tags{})
etypeinfo := theTC.infoWhileGenerating(etype, rlpstruct.Tags{})
if etypeinfo.decoderErr != nil {
return nil, etypeinfo.decoderErr
}
@ -286,7 +253,7 @@ func makeListDecoder(typ reflect.Type, tag tags) (decoder, error) {
dec = func(s *Stream, val reflect.Value) error {
return decodeListArray(s, val, etypeinfo.decoder)
}
case tag.tail:
case tag.Tail:
// A slice with "tail" tag can occur as the last field
// of a struct and is supposed to swallow all remaining
// list elements. The struct decoder already called s.List,
@ -451,16 +418,16 @@ func zeroFields(structval reflect.Value, fields []field) {
}
// makePtrDecoder creates a decoder that decodes into the pointer's element type.
func makePtrDecoder(typ reflect.Type, tag tags) (decoder, error) {
func makePtrDecoder(typ reflect.Type, tag rlpstruct.Tags) (decoder, error) {
etype := typ.Elem()
etypeinfo := theTC.infoWhileGenerating(etype, tags{})
etypeinfo := theTC.infoWhileGenerating(etype, rlpstruct.Tags{})
switch {
case etypeinfo.decoderErr != nil:
return nil, etypeinfo.decoderErr
case !tag.nilOK:
case !tag.NilOK:
return makeSimplePtrDecoder(etype, etypeinfo), nil
default:
return makeNilPtrDecoder(etype, etypeinfo, tag.nilKind), nil
return makeNilPtrDecoder(etype, etypeinfo, tag), nil
}
}
@ -481,9 +448,13 @@ func makeSimplePtrDecoder(etype reflect.Type, etypeinfo *typeinfo) decoder {
// values are decoded into a value of the element type, just like makePtrDecoder does.
//
// This decoder is used for pointer-typed struct fields with struct tag "nil".
func makeNilPtrDecoder(etype reflect.Type, etypeinfo *typeinfo, nilKind Kind) decoder {
func makeNilPtrDecoder(etype reflect.Type, etypeinfo *typeinfo, ts rlpstruct.Tags) decoder {
typ := reflect.PtrTo(etype)
nilPtr := reflect.Zero(typ)
// Determine the value kind that results in nil pointer.
nilKind := typeNilKind(etype, ts)
return func(s *Stream, val reflect.Value) (err error) {
kind, size, err := s.Kind()
if err != nil {
@ -659,6 +630,37 @@ func (s *Stream) Bytes() ([]byte, error) {
}
}
// ReadBytes decodes the next RLP value and stores the result in b.
// The value size must match len(b) exactly.
func (s *Stream) ReadBytes(b []byte) error {
kind, size, err := s.Kind()
if err != nil {
return err
}
switch kind {
case Byte:
if len(b) != 1 {
return fmt.Errorf("input value has wrong size 1, want %d", len(b))
}
b[0] = s.byteval
s.kind = -1 // rearm Kind
return nil
case String:
if uint64(len(b)) != size {
return fmt.Errorf("input value has wrong size %d, want %d", size, len(b))
}
if err = s.readFull(b); err != nil {
return err
}
if size == 1 && b[0] < 128 {
return ErrCanonSize
}
return nil
default:
return ErrExpectedString
}
}
// Raw reads a raw encoded value including RLP type information.
func (s *Stream) Raw() ([]byte, error) {
kind, size, err := s.Kind()
@ -687,10 +689,31 @@ func (s *Stream) Raw() ([]byte, error) {
// Uint reads an RLP string of up to 8 bytes and returns its contents
// as an unsigned integer. If the input does not contain an RLP string, the
// returned error will be ErrExpectedString.
//
// Deprecated: use s.Uint64 instead.
func (s *Stream) Uint() (uint64, error) {
return s.uint(64)
}
func (s *Stream) Uint64() (uint64, error) {
return s.uint(64)
}
func (s *Stream) Uint32() (uint32, error) {
i, err := s.uint(32)
return uint32(i), err
}
func (s *Stream) Uint16() (uint16, error) {
i, err := s.uint(16)
return uint16(i), err
}
func (s *Stream) Uint8() (uint8, error) {
i, err := s.uint(8)
return uint8(i), err
}
func (s *Stream) uint(maxbits int) (uint64, error) {
kind, size, err := s.Kind()
if err != nil {
@ -781,6 +804,65 @@ func (s *Stream) ListEnd() error {
return nil
}
// MoreDataInList reports whether the current list context contains
// more data to be read.
func (s *Stream) MoreDataInList() bool {
_, listLimit := s.listLimit()
return listLimit > 0
}
// BigInt decodes an arbitrary-size integer value.
func (s *Stream) BigInt() (*big.Int, error) {
i := new(big.Int)
if err := s.decodeBigInt(i); err != nil {
return nil, err
}
return i, nil
}
func (s *Stream) decodeBigInt(dst *big.Int) error {
var buffer []byte
kind, size, err := s.Kind()
switch {
case err != nil:
return err
case kind == List:
return ErrExpectedString
case kind == Byte:
buffer = s.uintbuf[:1]
buffer[0] = s.byteval
s.kind = -1 // re-arm Kind
case size == 0:
// Avoid zero-length read.
s.kind = -1
case size <= uint64(len(s.uintbuf)):
// For integers smaller than s.uintbuf, allocating a buffer
// can be avoided.
buffer = s.uintbuf[:size]
if err := s.readFull(buffer); err != nil {
return err
}
// Reject inputs where single byte encoding should have been used.
if size == 1 && buffer[0] < 128 {
return ErrCanonSize
}
default:
// For large integers, a temporary buffer is needed.
buffer = make([]byte, size)
if err := s.readFull(buffer); err != nil {
return err
}
}
// Reject leading zero bytes.
if len(buffer) > 0 && buffer[0] == 0 {
return ErrCanonInt
}
// Set the integer bytes.
dst.SetBytes(buffer)
return nil
}
// Decode decodes a value and stores the result in the value pointed
// to by val. Please see the documentation for the Decode function
// to learn about the decoding rules.

43
rlp/decode_test.go
View File

@ -286,6 +286,47 @@ func TestStreamRaw(t *testing.T) {
}
}
func TestStreamReadBytes(t *testing.T) {
tests := []struct {
input string
size int
err string
}{
// kind List
{input: "C0", size: 1, err: "rlp: expected String or Byte"},
// kind Byte
{input: "04", size: 0, err: "input value has wrong size 1, want 0"},
{input: "04", size: 1},
{input: "04", size: 2, err: "input value has wrong size 1, want 2"},
// kind String
{input: "820102", size: 0, err: "input value has wrong size 2, want 0"},
{input: "820102", size: 1, err: "input value has wrong size 2, want 1"},
{input: "820102", size: 2},
{input: "820102", size: 3, err: "input value has wrong size 2, want 3"},
}
for _, test := range tests {
test := test
name := fmt.Sprintf("input_%s/size_%d", test.input, test.size)
t.Run(name, func(t *testing.T) {
s := NewStream(bytes.NewReader(unhex(test.input)), 0)
b := make([]byte, test.size)
err := s.ReadBytes(b)
if test.err == "" {
if err != nil {
t.Errorf("unexpected error %q", err)
}
} else {
if err == nil {
t.Errorf("expected error, got nil")
} else if err.Error() != test.err {
t.Errorf("wrong error %q", err)
}
}
})
}
}
func TestDecodeErrors(t *testing.T) {
r := bytes.NewReader(nil)
@ -990,7 +1031,7 @@ func TestInvalidOptionalField(t *testing.T) {
v interface{}
err string
}{
{v: new(invalid1), err: `rlp: struct field rlp.invalid1.B needs "optional" tag`},
{v: new(invalid1), err: `rlp: invalid struct tag "" for rlp.invalid1.B (must be optional because preceding field "A" is optional)`},
{v: new(invalid2), err: `rlp: invalid struct tag "optional" for rlp.invalid2.T (also has "tail" tag)`},
{v: new(invalid3), err: `rlp: invalid struct tag "tail" for rlp.invalid3.T (also has "optional" tag)`},
}

352
rlp/encbuffer.go Normal file
View File

@ -0,0 +1,352 @@
package rlp
import (
"io"
"math/big"
"reflect"
"sync"
)
type encBuffer struct {
str []byte // string data, contains everything except list headers
lheads []listhead // all list headers
lhsize int // sum of sizes of all encoded list headers
sizebuf [9]byte // auxiliary buffer for uint encoding
}
// The global encBuffer pool.
var encBufferPool = sync.Pool{
New: func() interface{} { return new(encBuffer) },
}
func getEncBuffer() *encBuffer {
buf := encBufferPool.Get().(*encBuffer)
buf.reset()
return buf
}
func (buf *encBuffer) reset() {
buf.lhsize = 0
buf.str = buf.str[:0]
buf.lheads = buf.lheads[:0]
}
// size returns the length of the encoded data.
func (buf *encBuffer) size() int {
return len(buf.str) + buf.lhsize
}
// toBytes creates the encoder output.
func (w *encBuffer) toBytes() []byte {
out := make([]byte, w.size())
strpos := 0
pos := 0
for _, head := range w.lheads {
// write string data before header
n := copy(out[pos:], w.str[strpos:head.offset])
pos += n
strpos += n
// write the header
enc := head.encode(out[pos:])
pos += len(enc)
}
// copy string data after the last list header
copy(out[pos:], w.str[strpos:])
return out
}
// toWriter writes the encoder output to w.
func (buf *encBuffer) toWriter(w io.Writer) (err error) {
strpos := 0
for _, head := range buf.lheads {
// write string data before header
if head.offset-strpos > 0 {
n, err := w.Write(buf.str[strpos:head.offset])
strpos += n
if err != nil {
return err
}
}
// write the header
enc := head.encode(buf.sizebuf[:])
if _, err = w.Write(enc); err != nil {
return err
}
}
if strpos < len(buf.str) {
// write string data after the last list header
_, err = w.Write(buf.str[strpos:])
}
return err
}
// Write implements io.Writer and appends b directly to the output.
func (buf *encBuffer) Write(b []byte) (int, error) {
buf.str = append(buf.str, b...)
return len(b), nil
}
// writeBool writes b as the integer 0 (false) or 1 (true).
func (buf *encBuffer) writeBool(b bool) {
if b {
buf.str = append(buf.str, 0x01)
} else {
buf.str = append(buf.str, 0x80)
}
}
func (buf *encBuffer) writeUint64(i uint64) {
if i == 0 {
buf.str = append(buf.str, 0x80)
} else if i < 128 {
// fits single byte
buf.str = append(buf.str, byte(i))
} else {
s := putint(buf.sizebuf[1:], i)
buf.sizebuf[0] = 0x80 + byte(s)
buf.str = append(buf.str, buf.sizebuf[:s+1]...)
}
}
func (buf *encBuffer) writeBytes(b []byte) {
if len(b) == 1 && b[0] <= 0x7F {
// fits single byte, no string header
buf.str = append(buf.str, b[0])
} else {
buf.encodeStringHeader(len(b))
buf.str = append(buf.str, b...)
}
}
// wordBytes is the number of bytes in a big.Word
const wordBytes = (32 << (uint64(^big.Word(0)) >> 63)) / 8
// writeBigInt writes i as an integer.
func (w *encBuffer) writeBigInt(i *big.Int) {
bitlen := i.BitLen()
if bitlen <= 64 {
w.writeUint64(i.Uint64())
return
}
// Integer is larger than 64 bits, encode from i.Bits().
// The minimal byte length is bitlen rounded up to the next
// multiple of 8, divided by 8.
length := ((bitlen + 7) & -8) >> 3
w.encodeStringHeader(length)
w.str = append(w.str, make([]byte, length)...)
index := length
buf := w.str[len(w.str)-length:]
for _, d := range i.Bits() {
for j := 0; j < wordBytes && index > 0; j++ {
index--
buf[index] = byte(d)
d >>= 8
}
}
}
// list adds a new list header to the header stack. It returns the index of the header.
// Call listEnd with this index after encoding the content of the list.
func (buf *encBuffer) list() int {
buf.lheads = append(buf.lheads, listhead{offset: len(buf.str), size: buf.lhsize})
return len(buf.lheads) - 1
}
func (buf *encBuffer) listEnd(index int) {
lh := &buf.lheads[index]
lh.size = buf.size() - lh.offset - lh.size
if lh.size < 56 {
buf.lhsize++ // length encoded into kind tag
} else {
buf.lhsize += 1 + intsize(uint64(lh.size))
}
}
func (buf *encBuffer) encode(val interface{}) error {
rval := reflect.ValueOf(val)
writer, err := cachedWriter(rval.Type())
if err != nil {
return err
}
return writer(rval, buf)
}
func (buf *encBuffer) encodeStringHeader(size int) {
if size < 56 {
buf.str = append(buf.str, 0x80+byte(size))
} else {
sizesize := putint(buf.sizebuf[1:], uint64(size))
buf.sizebuf[0] = 0xB7 + byte(sizesize)
buf.str = append(buf.str, buf.sizebuf[:sizesize+1]...)
}
}
// encReader is the io.Reader returned by EncodeToReader.
// It releases its encbuf at EOF.
type encReader struct {
buf *encBuffer // the buffer we're reading from. this is nil when we're at EOF.
lhpos int // index of list header that we're reading
strpos int // current position in string buffer
piece []byte // next piece to be read
}
func (r *encReader) Read(b []byte) (n int, err error) {
for {
if r.piece = r.next(); r.piece == nil {
// Put the encode buffer back into the pool at EOF when it
// is first encountered. Subsequent calls still return EOF
// as the error but the buffer is no longer valid.
if r.buf != nil {
encBufferPool.Put(r.buf)
r.buf = nil
}
return n, io.EOF
}
nn := copy(b[n:], r.piece)
n += nn
if nn < len(r.piece) {
// piece didn't fit, see you next time.
r.piece = r.piece[nn:]
return n, nil
}
r.piece = nil
}
}
// next returns the next piece of data to be read.
// it returns nil at EOF.
func (r *encReader) next() []byte {
switch {
case r.buf == nil:
return nil
case r.piece != nil:
// There is still data available for reading.
return r.piece
case r.lhpos < len(r.buf.lheads):
// We're before the last list header.
head := r.buf.lheads[r.lhpos]
sizebefore := head.offset - r.strpos
if sizebefore > 0 {
// String data before header.
p := r.buf.str[r.strpos:head.offset]
r.strpos += sizebefore
return p
}
r.lhpos++
return head.encode(r.buf.sizebuf[:])
case r.strpos < len(r.buf.str):
// String data at the end, after all list headers.
p := r.buf.str[r.strpos:]
r.strpos = len(r.buf.str)
return p
default:
return nil
}
}
// EncoderBuffer is a buffer for incremental encoding.
//
// The zero value is NOT ready for use. To get a usable buffer,
// create it using NewEncoderBuffer or call Reset.
type EncoderBuffer struct {
buf *encBuffer
dst io.Writer
ownBuffer bool
}
// NewEncoderBuffer creates an encoder buffer.
func NewEncoderBuffer(dst io.Writer) EncoderBuffer {
var w EncoderBuffer
w.Reset(dst)
return w
}
// Reset truncates the buffer and sets the output destination.
func (w *EncoderBuffer) Reset(dst io.Writer) {
if w.buf != nil && !w.ownBuffer {
panic("can't Reset derived EncoderBuffer")
}
// If the destination writer has an *encBuffer, use it.
// Note that w.ownBuffer is left false here.
if dst != nil {
if outer, ok := dst.(*encBuffer); ok {
*w = EncoderBuffer{outer, nil, false}
return
}
if outer, ok := dst.(EncoderBuffer); ok {
*w = EncoderBuffer{outer.buf, nil, false}
return
}
}
// Get a fresh buffer.
if w.buf == nil {
w.buf = encBufferPool.Get().(*encBuffer)
w.ownBuffer = true
}
w.buf.reset()
w.dst = dst
}
// Flush writes encoded RLP data to the output writer. This can only be called once.
// If you want to re-use the buffer after Flush, you must call Reset.
func (w *EncoderBuffer) Flush() error {
var err error
if w.dst != nil {
err = w.buf.toWriter(w.dst)
}
// Release the internal buffer.
if w.ownBuffer {
encBufferPool.Put(w.buf)
}
*w = EncoderBuffer{}
return err
}
// ToBytes returns the encoded bytes.
func (w *EncoderBuffer) ToBytes() []byte {
return w.buf.toBytes()
}
// Write appends b directly to the encoder output.
func (w EncoderBuffer) Write(b []byte) (int, error) {
return w.buf.Write(b)
}
// WriteBool writes b as the integer 0 (false) or 1 (true).
func (w EncoderBuffer) WriteBool(b bool) {
w.buf.writeBool(b)
}
// WriteUint64 encodes an unsigned integer.
func (w EncoderBuffer) WriteUint64(i uint64) {
w.buf.writeUint64(i)
}
// WriteBigInt encodes a big.Int as an RLP string.
// Note: Unlike with Encode, the sign of i is ignored.
func (w EncoderBuffer) WriteBigInt(i *big.Int) {
w.buf.writeBigInt(i)
}
// WriteBytes encodes b as an RLP string.
func (w EncoderBuffer) WriteBytes(b []byte) {
w.buf.writeBytes(b)
}
// List starts a list. It returns an internal index. Call EndList with
// this index after encoding the content to finish the list.
func (w EncoderBuffer) List() int {
return w.buf.list()
}
// ListEnd finishes the given list.
func (w EncoderBuffer) ListEnd(index int) {
w.buf.listEnd(index)
}

45
rlp/encbuffer_example_test.go Normal file
View File

@ -0,0 +1,45 @@
// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rlp_test
import (
"bytes"
"fmt"
"github.com/ethereum/go-ethereum/rlp"
)
func ExampleEncoderBuffer() {
var w bytes.Buffer
// Encode [4, [5, 6]] to w.
buf := rlp.NewEncoderBuffer(&w)
l1 := buf.List()
buf.WriteUint64(4)
l2 := buf.List()
buf.WriteUint64(5)
buf.WriteUint64(6)
buf.ListEnd(l2)
buf.ListEnd(l1)
if err := buf.Flush(); err != nil {
panic(err)
}
fmt.Printf("%X\n", w.Bytes())
// Output:
// C404C20506
}

360
rlp/encode.go
View File

@ -17,11 +17,13 @@
package rlp
import (
"errors"
"fmt"
"io"
"math/big"
"reflect"
"sync"
"github.com/ethereum/go-ethereum/rlp/internal/rlpstruct"
)
var (
@ -31,6 +33,8 @@ var (
EmptyList = []byte{0xC0}
)
var ErrNegativeBigInt = errors.New("rlp: cannot encode negative big.Int")
// Encoder is implemented by types that require custom
// encoding rules or want to encode private fields.
type Encoder interface {
@ -51,30 +55,33 @@ type Encoder interface {
//
// Please see package-level documentation of encoding rules.
func Encode(w io.Writer, val interface{}) error {
if outer, ok := w.(*encbuf); ok {
// Encode was called by some type's EncodeRLP.
// Avoid copying by writing to the outer encbuf directly.
return outer.encode(val)
// Optimization: reuse *encBuffer when called by EncodeRLP.
if buf, ok := w.(*encBuffer); ok {
return buf.encode(val)
}
eb := encbufPool.Get().(*encbuf)
defer encbufPool.Put(eb)
eb.reset()
if err := eb.encode(val); err != nil {
if ebuf, ok := w.(EncoderBuffer); ok {
return ebuf.buf.encode(val)
}
buf := getEncBuffer()
defer encBufferPool.Put(buf)
if err := buf.encode(val); err != nil {
return err
}
return eb.toWriter(w)
return buf.toWriter(w)
}
// EncodeToBytes returns the RLP encoding of val.
// Please see package-level documentation for the encoding rules.
func EncodeToBytes(val interface{}) ([]byte, error) {
eb := encbufPool.Get().(*encbuf)
defer encbufPool.Put(eb)
eb.reset()
if err := eb.encode(val); err != nil {
buf := getEncBuffer()
defer encBufferPool.Put(buf)
if err := buf.encode(val); err != nil {
return nil, err
}
return eb.toBytes(), nil
return buf.toBytes(), nil
}
// EncodeToReader returns a reader from which the RLP encoding of val
@ -83,12 +90,15 @@ func EncodeToBytes(val interface{}) ([]byte, error) {
//
// Please see the documentation of Encode for the encoding rules.
func EncodeToReader(val interface{}) (size int, r io.Reader, err error) {
eb := encbufPool.Get().(*encbuf)
eb.reset()
if err := eb.encode(val); err != nil {
buf := getEncBuffer()
if err := buf.encode(val); err != nil {
encBufferPool.Put(buf)
return 0, nil, err
}
return eb.size(), &encReader{buf: eb}, nil
// Note: can't put the reader back into the pool here
// because it is held by encReader. The reader puts it
// back when it has been fully consumed.
return buf.size(), &encReader{buf: buf}, nil
}
type listhead struct {
@ -123,207 +133,10 @@ func puthead(buf []byte, smalltag, largetag byte, size uint64) int {
return sizesize + 1
}
type encbuf struct {
str []byte // string data, contains everything except list headers
lheads []listhead // all list headers
lhsize int // sum of sizes of all encoded list headers
sizebuf [9]byte // auxiliary buffer for uint encoding
}
// encbufs are pooled.
var encbufPool = sync.Pool{
New: func() interface{} { return new(encbuf) },
}
func (w *encbuf) reset() {
w.lhsize = 0
w.str = w.str[:0]
w.lheads = w.lheads[:0]
}
// encbuf implements io.Writer so it can be passed it into EncodeRLP.
func (w *encbuf) Write(b []byte) (int, error) {
w.str = append(w.str, b...)
return len(b), nil
}
func (w *encbuf) encode(val interface{}) error {
rval := reflect.ValueOf(val)
writer, err := cachedWriter(rval.Type())
if err != nil {
return err
}
return writer(rval, w)
}
func (w *encbuf) encodeStringHeader(size int) {
if size < 56 {
w.str = append(w.str, 0x80+byte(size))
} else {
sizesize := putint(w.sizebuf[1:], uint64(size))
w.sizebuf[0] = 0xB7 + byte(sizesize)
w.str = append(w.str, w.sizebuf[:sizesize+1]...)
}
}
func (w *encbuf) encodeString(b []byte) {
if len(b) == 1 && b[0] <= 0x7F {
// fits single byte, no string header
w.str = append(w.str, b[0])
} else {
w.encodeStringHeader(len(b))
w.str = append(w.str, b...)
}
}
func (w *encbuf) encodeUint(i uint64) {
if i == 0 {
w.str = append(w.str, 0x80)
} else if i < 128 {
// fits single byte
w.str = append(w.str, byte(i))
} else {
s := putint(w.sizebuf[1:], i)
w.sizebuf[0] = 0x80 + byte(s)
w.str = append(w.str, w.sizebuf[:s+1]...)
}
}
// list adds a new list header to the header stack. It returns the index
// of the header. The caller must call listEnd with this index after encoding
// the content of the list.
func (w *encbuf) list() int {
w.lheads = append(w.lheads, listhead{offset: len(w.str), size: w.lhsize})
return len(w.lheads) - 1
}
func (w *encbuf) listEnd(index int) {
lh := &w.lheads[index]
lh.size = w.size() - lh.offset - lh.size
if lh.size < 56 {
w.lhsize++ // length encoded into kind tag
} else {
w.lhsize += 1 + intsize(uint64(lh.size))
}
}
func (w *encbuf) size() int {
return len(w.str) + w.lhsize
}
func (w *encbuf) toBytes() []byte {
out := make([]byte, w.size())
strpos := 0
pos := 0
for _, head := range w.lheads {
// write string data before header
n := copy(out[pos:], w.str[strpos:head.offset])
pos += n
strpos += n
// write the header
enc := head.encode(out[pos:])
pos += len(enc)
}
// copy string data after the last list header
copy(out[pos:], w.str[strpos:])
return out
}
func (w *encbuf) toWriter(out io.Writer) (err error) {
strpos := 0
for _, head := range w.lheads {
// write string data before header
if head.offset-strpos > 0 {
n, err := out.Write(w.str[strpos:head.offset])
strpos += n
if err != nil {
return err
}
}
// write the header
enc := head.encode(w.sizebuf[:])
if _, err = out.Write(enc); err != nil {
return err
}
}
if strpos < len(w.str) {
// write string data after the last list header
_, err = out.Write(w.str[strpos:])
}
return err
}
// encReader is the io.Reader returned by EncodeToReader.
// It releases its encbuf at EOF.
type encReader struct {
buf *encbuf // the buffer we're reading from. this is nil when we're at EOF.
lhpos int // index of list header that we're reading
strpos int // current position in string buffer
piece []byte // next piece to be read
}
func (r *encReader) Read(b []byte) (n int, err error) {
for {
if r.piece = r.next(); r.piece == nil {
// Put the encode buffer back into the pool at EOF when it
// is first encountered. Subsequent calls still return EOF
// as the error but the buffer is no longer valid.
if r.buf != nil {
encbufPool.Put(r.buf)
r.buf = nil
}
return n, io.EOF
}
nn := copy(b[n:], r.piece)
n += nn
if nn < len(r.piece) {
// piece didn't fit, see you next time.
r.piece = r.piece[nn:]
return n, nil
}
r.piece = nil
}
}
// next returns the next piece of data to be read.
// it returns nil at EOF.
func (r *encReader) next() []byte {
switch {
case r.buf == nil:
return nil
case r.piece != nil:
// There is still data available for reading.
return r.piece
case r.lhpos < len(r.buf.lheads):
// We're before the last list header.
head := r.buf.lheads[r.lhpos]
sizebefore := head.offset - r.strpos
if sizebefore > 0 {
// String data before header.
p := r.buf.str[r.strpos:head.offset]
r.strpos += sizebefore
return p
}
r.lhpos++
return head.encode(r.buf.sizebuf[:])
case r.strpos < len(r.buf.str):
// String data at the end, after all list headers.
p := r.buf.str[r.strpos:]
r.strpos = len(r.buf.str)
return p
default:
return nil
}
}
var encoderInterface = reflect.TypeOf(new(Encoder)).Elem()
// makeWriter creates a writer function for the given type.
func makeWriter(typ reflect.Type, ts tags) (writer, error) {
func makeWriter(typ reflect.Type, ts rlpstruct.Tags) (writer, error) {
kind := typ.Kind()
switch {
case typ == rawValueType:
@ -357,71 +170,45 @@ func makeWriter(typ reflect.Type, ts tags) (writer, error) {
}
}
func writeRawValue(val reflect.Value, w *encbuf) error {
func writeRawValue(val reflect.Value, w *encBuffer) error {
w.str = append(w.str, val.Bytes()...)
return nil
}
func writeUint(val reflect.Value, w *encbuf) error {
w.encodeUint(val.Uint())
func writeUint(val reflect.Value, w *encBuffer) error {
w.writeUint64(val.Uint())
return nil
}
func writeBool(val reflect.Value, w *encbuf) error {
if val.Bool() {
w.str = append(w.str, 0x01)
} else {
w.str = append(w.str, 0x80)
}
func writeBool(val reflect.Value, w *encBuffer) error {
w.writeBool(val.Bool())
return nil
}
func writeBigIntPtr(val reflect.Value, w *encbuf) error {
func writeBigIntPtr(val reflect.Value, w *encBuffer) error {
ptr := val.Interface().(*big.Int)
if ptr == nil {
w.str = append(w.str, 0x80)
return nil
}
return writeBigInt(ptr, w)
if ptr.Sign() == -1 {
return ErrNegativeBigInt
}
w.writeBigInt(ptr)
return nil
}
func writeBigIntNoPtr(val reflect.Value, w *encbuf) error {
func writeBigIntNoPtr(val reflect.Value, w *encBuffer) error {
i := val.Interface().(big.Int)
return writeBigInt(&i, w)
}
// wordBytes is the number of bytes in a big.Word
const wordBytes = (32 << (uint64(^big.Word(0)) >> 63)) / 8
func writeBigInt(i *big.Int, w *encbuf) error {
if i.Sign() == -1 {
return fmt.Errorf("rlp: cannot encode negative *big.Int")
}
bitlen := i.BitLen()
if bitlen <= 64 {
w.encodeUint(i.Uint64())
return nil
}
// Integer is larger than 64 bits, encode from i.Bits().
// The minimal byte length is bitlen rounded up to the next
// multiple of 8, divided by 8.
length := ((bitlen + 7) & -8) >> 3
w.encodeStringHeader(length)
w.str = append(w.str, make([]byte, length)...)
index := length
buf := w.str[len(w.str)-length:]
for _, d := range i.Bits() {
for j := 0; j < wordBytes && index > 0; j++ {
index--
buf[index] = byte(d)
d >>= 8
}
return ErrNegativeBigInt
}
w.writeBigInt(&i)
return nil
}
func writeBytes(val reflect.Value, w *encbuf) error {
w.encodeString(val.Bytes())
func writeBytes(val reflect.Value, w *encBuffer) error {
w.writeBytes(val.Bytes())
return nil
}
@ -433,7 +220,7 @@ func makeByteArrayWriter(typ reflect.Type) writer {
return writeLengthOneByteArray
default:
length := typ.Len()
return func(val reflect.Value, w *encbuf) error {
return func(val reflect.Value, w *encBuffer) error {
if !val.CanAddr() {
// Getting the byte slice of val requires it to be addressable. Make it
// addressable by copying.
@ -449,12 +236,12 @@ func makeByteArrayWriter(typ reflect.Type) writer {
}
}
func writeLengthZeroByteArray(val reflect.Value, w *encbuf) error {
func writeLengthZeroByteArray(val reflect.Value, w *encBuffer) error {
w.str = append(w.str, 0x80)
return nil
}
func writeLengthOneByteArray(val reflect.Value, w *encbuf) error {
func writeLengthOneByteArray(val reflect.Value, w *encBuffer) error {
b := byte(val.Index(0).Uint())
if b <= 0x7f {
w.str = append(w.str, b)
@ -464,7 +251,7 @@ func writeLengthOneByteArray(val reflect.Value, w *encbuf) error {
return nil
}
func writeString(val reflect.Value, w *encbuf) error {
func writeString(val reflect.Value, w *encBuffer) error {
s := val.String()
if len(s) == 1 && s[0] <= 0x7f {
// fits single byte, no string header
@ -476,7 +263,7 @@ func writeString(val reflect.Value, w *encbuf) error {
return nil
}
func writeInterface(val reflect.Value, w *encbuf) error {
func writeInterface(val reflect.Value, w *encBuffer) error {
if val.IsNil() {
// Write empty list. This is consistent with the previous RLP
// encoder that we had and should therefore avoid any
@ -492,17 +279,17 @@ func writeInterface(val reflect.Value, w *encbuf) error {
return writer(eval, w)
}
func makeSliceWriter(typ reflect.Type, ts tags) (writer, error) {
etypeinfo := theTC.infoWhileGenerating(typ.Elem(), tags{})
func makeSliceWriter(typ reflect.Type, ts rlpstruct.Tags) (writer, error) {
etypeinfo := theTC.infoWhileGenerating(typ.Elem(), rlpstruct.Tags{})
if etypeinfo.writerErr != nil {
return nil, etypeinfo.writerErr
}
var wfn writer
if ts.tail {
if ts.Tail {
// This is for struct tail slices.
// w.list is not called for them.
wfn = func(val reflect.Value, w *encbuf) error {
wfn = func(val reflect.Value, w *encBuffer) error {
vlen := val.Len()
for i := 0; i < vlen; i++ {
if err := etypeinfo.writer(val.Index(i), w); err != nil {
@ -513,7 +300,7 @@ func makeSliceWriter(typ reflect.Type, ts tags) (writer, error) {
}
} else {
// This is for regular slices and arrays.
wfn = func(val reflect.Value, w *encbuf) error {
wfn = func(val reflect.Value, w *encBuffer) error {
vlen := val.Len()
if vlen == 0 {
w.str = append(w.str, 0xC0)
@ -547,7 +334,7 @@ func makeStructWriter(typ reflect.Type) (writer, error) {
firstOptionalField := firstOptionalField(fields)
if firstOptionalField == len(fields) {
// This is the writer function for structs without any optional fields.
writer = func(val reflect.Value, w *encbuf) error {
writer = func(val reflect.Value, w *encBuffer) error {
lh := w.list()
for _, f := range fields {
if err := f.info.writer(val.Field(f.index), w); err != nil {
@ -560,7 +347,7 @@ func makeStructWriter(typ reflect.Type) (writer, error) {
} else {
// If there are any "optional" fields, the writer needs to perform additional
// checks to determine the output list length.
writer = func(val reflect.Value, w *encbuf) error {
writer = func(val reflect.Value, w *encBuffer) error {
lastField := len(fields) - 1
for ; lastField >= firstOptionalField; lastField-- {
if !val.Field(fields[lastField].index).IsZero() {
@ -580,33 +367,18 @@ func makeStructWriter(typ reflect.Type) (writer, error) {
return writer, nil
}
// nilEncoding returns the encoded value of a nil pointer.
func nilEncoding(typ reflect.Type, ts tags) uint8 {
var nilKind Kind
if ts.nilOK {
nilKind = ts.nilKind // use struct tag if provided
} else {
nilKind = defaultNilKind(typ.Elem())
func makePtrWriter(typ reflect.Type, ts rlpstruct.Tags) (writer, error) {
nilEncoding := byte(0xC0)
if typeNilKind(typ.Elem(), ts) == String {
nilEncoding = 0x80
}
switch nilKind {
case String:
return 0x80
case List:
return 0xC0
default:
panic(fmt.Errorf("rlp: invalid nil kind %d", nilKind))
}
}
func makePtrWriter(typ reflect.Type, ts tags) (writer, error) {
etypeinfo := theTC.infoWhileGenerating(typ.Elem(), tags{})
etypeinfo := theTC.infoWhileGenerating(typ.Elem(), rlpstruct.Tags{})
if etypeinfo.writerErr != nil {
return nil, etypeinfo.writerErr
}
nilEncoding := nilEncoding(typ, ts)
writer := func(val reflect.Value, w *encbuf) error {
writer := func(val reflect.Value, w *encBuffer) error {
if ev := val.Elem(); ev.IsValid() {
return etypeinfo.writer(ev, w)
}
@ -618,11 +390,11 @@ func makePtrWriter(typ reflect.Type, ts tags) (writer, error) {
func makeEncoderWriter(typ reflect.Type) writer {
if typ.Implements(encoderInterface) {
return func(val reflect.Value, w *encbuf) error {
return func(val reflect.Value, w *encBuffer) error {
return val.Interface().(Encoder).EncodeRLP(w)
}
}
w := func(val reflect.Value, w *encbuf) error {
w := func(val reflect.Value, w *encBuffer) error {
if !val.CanAddr() {
// package json simply doesn't call MarshalJSON for this case, but encodes the
// value as if it didn't implement the interface. We don't want to handle it that

3
rlp/encode_test.go
View File

@ -145,7 +145,8 @@ var encTests = []encTest{
{val: *big.NewInt(0xFFFFFF), output: "83FFFFFF"},
// negative ints are not supported
{val: big.NewInt(-1), error: "rlp: cannot encode negative *big.Int"},
{val: big.NewInt(-1), error: "rlp: cannot encode negative big.Int"},
{val: *big.NewInt(-1), error: "rlp: cannot encode negative big.Int"},
// byte arrays
{val: [0]byte{}, output: "80"},

10
rlp/encoder_example_test.go
View File

@ -14,11 +14,13 @@
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rlp
package rlp_test
import (
"fmt"
"io"
"github.com/ethereum/go-ethereum/rlp"
)
type MyCoolType struct {
@ -28,16 +30,16 @@ type MyCoolType struct {
// EncodeRLP writes x as RLP list [a, b] that omits the Name field.
func (x *MyCoolType) EncodeRLP(w io.Writer) (err error) {
return Encode(w, []uint{x.a, x.b})
return rlp.Encode(w, []uint{x.a, x.b})
}
func ExampleEncoder() {
var t *MyCoolType // t is nil pointer to MyCoolType
bytes, _ := EncodeToBytes(t)
bytes, _ := rlp.EncodeToBytes(t)
fmt.Printf("%v → %X\n", t, bytes)
t = &MyCoolType{Name: "foobar", a: 5, b: 6}
bytes, _ = EncodeToBytes(t)
bytes, _ = rlp.EncodeToBytes(t)
fmt.Printf("%v → %X\n", t, bytes)
// Output:

213
rlp/internal/rlpstruct/rlpstruct.go Normal file
View File

@ -0,0 +1,213 @@
// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package rlpstruct implements struct processing for RLP encoding/decoding.
//
// In particular, this package handles all rules around field filtering,
// struct tags and nil value determination.
package rlpstruct
import (
"fmt"
"reflect"
"strings"
)
// Field represents a struct field.
type Field struct {
Name string
Index int
Exported bool
Type Type
Tag string
}
// Type represents the attributes of a Go type.
type Type struct {
Name string
Kind reflect.Kind
IsEncoder bool // whether type implements rlp.Encoder
IsDecoder bool // whether type implements rlp.Decoder
Elem *Type // non-nil for Kind values of Ptr, Slice, Array
}
// defaultNilValue determines whether a nil pointer to t encodes/decodes
// as an empty string or empty list.
func (t Type) DefaultNilValue() NilKind {
k := t.Kind
if isUint(k) || k == reflect.String || k == reflect.Bool || isByteArray(t) {
return NilKindString
}
return NilKindList
}
// NilKind is the RLP value encoded in place of nil pointers.
type NilKind uint8
const (
NilKindString NilKind = 0x80
NilKindList NilKind = 0xC0
)
// Tags represents struct tags.
type Tags struct {
// rlp:"nil" controls whether empty input results in a nil pointer.
// nilKind is the kind of empty value allowed for the field.
NilKind NilKind
NilOK bool
// rlp:"optional" allows for a field to be missing in the input list.
// If this is set, all subsequent fields must also be optional.
Optional bool
// rlp:"tail" controls whether this field swallows additional list elements. It can
// only be set for the last field, which must be of slice type.
Tail bool
// rlp:"-" ignores fields.
Ignored bool
}
// TagError is raised for invalid struct tags.
type TagError struct {
StructType string
// These are set by this package.
Field string
Tag string
Err string
}
func (e TagError) Error() string {
field := "field " + e.Field
if e.StructType != "" {
field = e.StructType + "." + e.Field
}
return fmt.Sprintf("rlp: invalid struct tag %q for %s (%s)", e.Tag, field, e.Err)
}
// ProcessFields filters the given struct fields, returning only fields
// that should be considered for encoding/decoding.
func ProcessFields(allFields []Field) ([]Field, []Tags, error) {
lastPublic := lastPublicField(allFields)
// Gather all exported fields and their tags.
var fields []Field
var tags []Tags
for _, field := range allFields {
if !field.Exported {
continue
}
ts, err := parseTag(field, lastPublic)
if err != nil {
return nil, nil, err
}
if ts.Ignored {
continue
}
fields = append(fields, field)
tags = append(tags, ts)
}
// Verify optional field consistency. If any optional field exists,
// all fields after it must also be optional. Note: optional + tail
// is supported.
var anyOptional bool
var firstOptionalName string
for i, ts := range tags {
name := fields[i].Name
if ts.Optional || ts.Tail {
if !anyOptional {
firstOptionalName = name
}
anyOptional = true
} else {
if anyOptional {
msg := fmt.Sprintf("must be optional because preceding field %q is optional", firstOptionalName)
return nil, nil, TagError{Field: name, Err: msg}
}
}
}
return fields, tags, nil
}
func parseTag(field Field, lastPublic int) (Tags, error) {
name := field.Name
tag := reflect.StructTag(field.Tag)
var ts Tags
for _, t := range strings.Split(tag.Get("rlp"), ",") {
switch t = strings.TrimSpace(t); t {
case "":
// empty tag is allowed for some reason
case "-":
ts.Ignored = true
case "nil", "nilString", "nilList":
ts.NilOK = true
if field.Type.Kind != reflect.Ptr {
return ts, TagError{Field: name, Tag: t, Err: "field is not a pointer"}
}
switch t {
case "nil":
ts.NilKind = field.Type.Elem.DefaultNilValue()
case "nilString":
ts.NilKind = NilKindString
case "nilList":
ts.NilKind = NilKindList
}
case "optional":
ts.Optional = true
if ts.Tail {
return ts, TagError{Field: name, Tag: t, Err: `also has "tail" tag`}
}
case "tail":
ts.Tail = true
if field.Index != lastPublic {
return ts, TagError{Field: name, Tag: t, Err: "must be on last field"}
}
if ts.Optional {
return ts, TagError{Field: name, Tag: t, Err: `also has "optional" tag`}
}
if field.Type.Kind != reflect.Slice {
return ts, TagError{Field: name, Tag: t, Err: "field type is not slice"}
}
default:
return ts, TagError{Field: name, Tag: t, Err: "unknown tag"}
}
}
return ts, nil
}
func lastPublicField(fields []Field) int {
last := 0
for _, f := range fields {
if f.Exported {
last = f.Index
}
}
return last
}
func isUint(k reflect.Kind) bool {
return k >= reflect.Uint && k <= reflect.Uintptr
}
func isByte(typ Type) bool {
return typ.Kind == reflect.Uint8 && !typ.IsEncoder
}
func isByteArray(typ Type) bool {
return (typ.Kind == reflect.Slice || typ.Kind == reflect.Array) && isByte(*typ.Elem)
}

735
rlp/rlpgen/gen.go Normal file
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@ -0,0 +1,735 @@
package main
import (
"bytes"
"fmt"
"go/format"
"go/types"
"sort"
"github.com/ethereum/go-ethereum/rlp/internal/rlpstruct"
)
// buildContext keeps the data needed for make*Op.
type buildContext struct {
topType *types.Named // the type we're creating methods for
encoderIface *types.Interface
decoderIface *types.Interface
rawValueType *types.Named
typeToStructCache map[types.Type]*rlpstruct.Type
}
func newBuildContext(packageRLP *types.Package) *buildContext {
enc := packageRLP.Scope().Lookup("Encoder").Type().Underlying()
dec := packageRLP.Scope().Lookup("Decoder").Type().Underlying()
rawv := packageRLP.Scope().Lookup("RawValue").Type()
return &buildContext{
typeToStructCache: make(map[types.Type]*rlpstruct.Type),
encoderIface: enc.(*types.Interface),
decoderIface: dec.(*types.Interface),
rawValueType: rawv.(*types.Named),
}
}
func (bctx *buildContext) isEncoder(typ types.Type) bool {
return types.Implements(typ, bctx.encoderIface)
}
func (bctx *buildContext) isDecoder(typ types.Type) bool {
return types.Implements(typ, bctx.decoderIface)
}
// typeToStructType converts typ to rlpstruct.Type.
func (bctx *buildContext) typeToStructType(typ types.Type) *rlpstruct.Type {
if prev := bctx.typeToStructCache[typ]; prev != nil {
return prev // short-circuit for recursive types.
}
// Resolve named types to their underlying type, but keep the name.
name := types.TypeString(typ, nil)
for {
utype := typ.Underlying()
if utype == typ {
break
}
typ = utype
}
// Create the type and store it in cache.
t := &rlpstruct.Type{
Name: name,
Kind: typeReflectKind(typ),
IsEncoder: bctx.isEncoder(typ),
IsDecoder: bctx.isDecoder(typ),
}
bctx.typeToStructCache[typ] = t
// Assign element type.
switch typ.(type) {
case *types.Array, *types.Slice, *types.Pointer:
etype := typ.(interface{ Elem() types.Type }).Elem()
t.Elem = bctx.typeToStructType(etype)
}
return t
}
// genContext is passed to the gen* methods of op when generating
// the output code. It tracks packages to be imported by the output
// file and assigns unique names of temporary variables.
type genContext struct {
inPackage *types.Package
imports map[string]struct{}
tempCounter int
}
func newGenContext(inPackage *types.Package) *genContext {
return &genContext{
inPackage: inPackage,
imports: make(map[string]struct{}),
}
}
func (ctx *genContext) temp() string {
v := fmt.Sprintf("_tmp%d", ctx.tempCounter)
ctx.tempCounter++
return v
}
func (ctx *genContext) resetTemp() {
ctx.tempCounter = 0
}
func (ctx *genContext) addImport(path string) {
if path == ctx.inPackage.Path() {
return // avoid importing the package that we're generating in.
}
// TODO: renaming?
ctx.imports[path] = struct{}{}
}
// importsList returns all packages that need to be imported.
func (ctx *genContext) importsList() []string {
imp := make([]string, 0, len(ctx.imports))
for k := range ctx.imports {
imp = append(imp, k)
}
sort.Strings(imp)
return imp
}
// qualify is the types.Qualifier used for printing types.
func (ctx *genContext) qualify(pkg *types.Package) string {
if pkg.Path() == ctx.inPackage.Path() {
return ""
}
ctx.addImport(pkg.Path())
// TODO: renaming?
return pkg.Name()
}
type op interface {
// genWrite creates the encoder. The generated code should write v,
// which is any Go expression, to the rlp.EncoderBuffer 'w'.
genWrite(ctx *genContext, v string) string
// genDecode creates the decoder. The generated code should read
// a value from the rlp.Stream 'dec' and store it to dst.
genDecode(ctx *genContext) (string, string)
}
// basicOp handles basic types bool, uint*, string.
type basicOp struct {
typ types.Type
writeMethod string // calle write the value
writeArgType types.Type // parameter type of writeMethod
decMethod string
decResultType types.Type // return type of decMethod
decUseBitSize bool // if true, result bit size is appended to decMethod
}
func (*buildContext) makeBasicOp(typ *types.Basic) (op, error) {
op := basicOp{typ: typ}
kind := typ.Kind()
switch {
case kind == types.Bool:
op.writeMethod = "WriteBool"
op.writeArgType = types.Typ[types.Bool]
op.decMethod = "Bool"
op.decResultType = types.Typ[types.Bool]
case kind >= types.Uint8 && kind <= types.Uint64:
op.writeMethod = "WriteUint64"
op.writeArgType = types.Typ[types.Uint64]
op.decMethod = "Uint"
op.decResultType = typ
op.decUseBitSize = true
case kind == types.String:
op.writeMethod = "WriteString"
op.writeArgType = types.Typ[types.String]
op.decMethod = "String"
op.decResultType = types.Typ[types.String]
default:
return nil, fmt.Errorf("unhandled basic type: %v", typ)
}
return op, nil
}
func (*buildContext) makeByteSliceOp(typ *types.Slice) op {
if !isByte(typ.Elem()) {
panic("non-byte slice type in makeByteSliceOp")
}
bslice := types.NewSlice(types.Typ[types.Uint8])
return basicOp{
typ: typ,
writeMethod: "WriteBytes",
writeArgType: bslice,
decMethod: "Bytes",
decResultType: bslice,
}
}
func (bctx *buildContext) makeRawValueOp() op {
bslice := types.NewSlice(types.Typ[types.Uint8])
return basicOp{
typ: bctx.rawValueType,
writeMethod: "Write",
writeArgType: bslice,
decMethod: "Raw",
decResultType: bslice,
}
}
func (op basicOp) writeNeedsConversion() bool {
return !types.AssignableTo(op.typ, op.writeArgType)
}
func (op basicOp) decodeNeedsConversion() bool {
return !types.AssignableTo(op.decResultType, op.typ)
}
func (op basicOp) genWrite(ctx *genContext, v string) string {
if op.writeNeedsConversion() {
v = fmt.Sprintf("%s(%s)", op.writeArgType, v)
}
return fmt.Sprintf("w.%s(%s)\n", op.writeMethod, v)
}
func (op basicOp) genDecode(ctx *genContext) (string, string) {
var (
resultV = ctx.temp()
result = resultV
method = op.decMethod
)
if op.decUseBitSize {
// Note: For now, this only works for platform-independent integer
// sizes. makeBasicOp forbids the platform-dependent types.
var sizes types.StdSizes
method = fmt.Sprintf("%s%d", op.decMethod, sizes.Sizeof(op.typ)*8)
}
// Call the decoder method.
var b bytes.Buffer
fmt.Fprintf(&b, "%s, err := dec.%s()\n", resultV, method)
fmt.Fprintf(&b, "if err != nil { return err }\n")
if op.decodeNeedsConversion() {
conv := ctx.temp()
fmt.Fprintf(&b, "%s := %s(%s)\n", conv, types.TypeString(op.typ, ctx.qualify), resultV)
result = conv
}
return result, b.String()
}
// byteArrayOp handles [...]byte.
type byteArrayOp struct {
typ types.Type
name types.Type // name != typ for named byte array types (e.g. common.Address)
}
func (bctx *buildContext) makeByteArrayOp(name *types.Named, typ *types.Array) byteArrayOp {
nt := types.Type(name)
if name == nil {
nt = typ
}
return byteArrayOp{typ, nt}
}
func (op byteArrayOp) genWrite(ctx *genContext, v string) string {
return fmt.Sprintf("w.WriteBytes(%s[:])\n", v)
}
func (op byteArrayOp) genDecode(ctx *genContext) (string, string) {
var resultV = ctx.temp()
var b bytes.Buffer
fmt.Fprintf(&b, "var %s %s\n", resultV, types.TypeString(op.name, ctx.qualify))
fmt.Fprintf(&b, "if err := dec.ReadBytes(%s[:]); err != nil { return err }\n", resultV)
return resultV, b.String()
}
// bigIntNoPtrOp handles non-pointer big.Int.
// This exists because big.Int has it's own decoder operation on rlp.Stream,
// but the decode method returns *big.Int, so it needs to be dereferenced.
type bigIntOp struct {
pointer bool
}
func (op bigIntOp) genWrite(ctx *genContext, v string) string {
var b bytes.Buffer
fmt.Fprintf(&b, "if %s.Sign() == -1 {\n", v)
fmt.Fprintf(&b, " return rlp.ErrNegativeBigInt\n")
fmt.Fprintf(&b, "}\n")
dst := v
if !op.pointer {
dst = "&" + v
}
fmt.Fprintf(&b, "w.WriteBigInt(%s)\n", dst)
// Wrap with nil check.
if op.pointer {
code := b.String()
b.Reset()
fmt.Fprintf(&b, "if %s == nil {\n", v)
fmt.Fprintf(&b, " w.Write(rlp.EmptyString)")
fmt.Fprintf(&b, "} else {\n")
fmt.Fprint(&b, code)
fmt.Fprintf(&b, "}\n")
}
return b.String()
}
func (op bigIntOp) genDecode(ctx *genContext) (string, string) {
var resultV = ctx.temp()
var b bytes.Buffer
fmt.Fprintf(&b, "%s, err := dec.BigInt()\n", resultV)
fmt.Fprintf(&b, "if err != nil { return err }\n")
result := resultV
if !op.pointer {
result = "(*" + resultV + ")"
}
return result, b.String()
}
// encoderDecoderOp handles rlp.Encoder and rlp.Decoder.
// In order to be used with this, the type must implement both interfaces.
// This restriction may be lifted in the future by creating separate ops for
// encoding and decoding.
type encoderDecoderOp struct {
typ types.Type
}
func (op encoderDecoderOp) genWrite(ctx *genContext, v string) string {
return fmt.Sprintf("if err := %s.EncodeRLP(w); err != nil { return err }\n", v)
}
func (op encoderDecoderOp) genDecode(ctx *genContext) (string, string) {
// DecodeRLP must have pointer receiver, and this is verified in makeOp.
etyp := op.typ.(*types.Pointer).Elem()
var resultV = ctx.temp()
var b bytes.Buffer
fmt.Fprintf(&b, "%s := new(%s)\n", resultV, types.TypeString(etyp, ctx.qualify))
fmt.Fprintf(&b, "if err := %s.DecodeRLP(dec); err != nil { return err }\n", resultV)
return resultV, b.String()
}
// ptrOp handles pointer types.
type ptrOp struct {
elemTyp types.Type
elem op
nilOK bool
nilValue rlpstruct.NilKind
}
func (bctx *buildContext) makePtrOp(elemTyp types.Type, tags rlpstruct.Tags) (op, error) {
elemOp, err := bctx.makeOp(nil, elemTyp, rlpstruct.Tags{})
if err != nil {
return nil, err
}
op := ptrOp{elemTyp: elemTyp, elem: elemOp}
// Determine nil value.
if tags.NilOK {
op.nilOK = true
op.nilValue = tags.NilKind
} else {
styp := bctx.typeToStructType(elemTyp)
op.nilValue = styp.DefaultNilValue()
}
return op, nil
}
func (op ptrOp) genWrite(ctx *genContext, v string) string {
// Note: in writer functions, accesses to v are read-only, i.e. v is any Go
// expression. To make all accesses work through the pointer, we substitute
// v with (*v). This is required for most accesses including `v`, `call(v)`,
// and `v[index]` on slices.
//
// For `v.field` and `v[:]` on arrays, the dereference operation is not required.
var vv string
_, isStruct := op.elem.(structOp)
_, isByteArray := op.elem.(byteArrayOp)
if isStruct || isByteArray {
vv = v
} else {
vv = fmt.Sprintf("(*%s)", v)
}
var b bytes.Buffer
fmt.Fprintf(&b, "if %s == nil {\n", v)
fmt.Fprintf(&b, " w.Write([]byte{0x%X})\n", op.nilValue)
fmt.Fprintf(&b, "} else {\n")
fmt.Fprintf(&b, " %s", op.elem.genWrite(ctx, vv))
fmt.Fprintf(&b, "}\n")
return b.String()
}
func (op ptrOp) genDecode(ctx *genContext) (string, string) {
result, code := op.elem.genDecode(ctx)
if !op.nilOK {
// If nil pointers are not allowed, we can just decode the element.
return "&" + result, code
}
// nil is allowed, so check the kind and size first.
// If size is zero and kind matches the nilKind of the type,
// the value decodes as a nil pointer.
var (
resultV = ctx.temp()
kindV = ctx.temp()
sizeV = ctx.temp()
wantKind string
)
if op.nilValue == rlpstruct.NilKindList {
wantKind = "rlp.List"
} else {
wantKind = "rlp.String"
}
var b bytes.Buffer
fmt.Fprintf(&b, "var %s %s\n", resultV, types.TypeString(types.NewPointer(op.elemTyp), ctx.qualify))
fmt.Fprintf(&b, "if %s, %s, err := dec.Kind(); err != nil {\n", kindV, sizeV)
fmt.Fprintf(&b, " return err\n")
fmt.Fprintf(&b, "} else if %s != 0 || %s != %s {\n", sizeV, kindV, wantKind)
fmt.Fprint(&b, code)
fmt.Fprintf(&b, " %s = &%s\n", resultV, result)
fmt.Fprintf(&b, "}\n")
return resultV, b.String()
}
// structOp handles struct types.
type structOp struct {
named *types.Named
typ *types.Struct
fields []*structField
optionalFields []*structField
}
type structField struct {
name string
typ types.Type
elem op
}
func (bctx *buildContext) makeStructOp(named *types.Named, typ *types.Struct) (op, error) {
// Convert fields to []rlpstruct.Field.
var allStructFields []rlpstruct.Field
for i := 0; i < typ.NumFields(); i++ {
f := typ.Field(i)
allStructFields = append(allStructFields, rlpstruct.Field{
Name: f.Name(),
Exported: f.Exported(),
Index: i,
Tag: typ.Tag(i),
Type: *bctx.typeToStructType(f.Type()),
})
}
// Filter/validate fields.
fields, tags, err := rlpstruct.ProcessFields(allStructFields)
if err != nil {
return nil, err
}
// Create field ops.
var op = structOp{named: named, typ: typ}
for i, field := range fields {
// Advanced struct tags are not supported yet.
tag := tags[i]
if err := checkUnsupportedTags(field.Name, tag); err != nil {
return nil, err
}
typ := typ.Field(field.Index).Type()
elem, err := bctx.makeOp(nil, typ, tags[i])
if err != nil {
return nil, fmt.Errorf("field %s: %v", field.Name, err)
}
f := &structField{name: field.Name, typ: typ, elem: elem}
if tag.Optional {
op.optionalFields = append(op.optionalFields, f)
} else {
op.fields = append(op.fields, f)
}
}
return op, nil
}
func checkUnsupportedTags(field string, tag rlpstruct.Tags) error {
if tag.Tail {
return fmt.Errorf(`field %s has unsupported struct tag "tail"`, field)
}
return nil
}
func (op structOp) genWrite(ctx *genContext, v string) string {
var b bytes.Buffer
var listMarker = ctx.temp()
fmt.Fprintf(&b, "%s := w.List()\n", listMarker)
for _, field := range op.fields {
selector := v + "." + field.name
fmt.Fprint(&b, field.elem.genWrite(ctx, selector))
}
op.writeOptionalFields(&b, ctx, v)
fmt.Fprintf(&b, "w.ListEnd(%s)\n", listMarker)
return b.String()
}
func (op structOp) writeOptionalFields(b *bytes.Buffer, ctx *genContext, v string) {
if len(op.optionalFields) == 0 {
return
}
// First check zero-ness of all optional fields.
var zeroV = make([]string, len(op.optionalFields))
for i, field := range op.optionalFields {
selector := v + "." + field.name
zeroV[i] = ctx.temp()
fmt.Fprintf(b, "%s := %s\n", zeroV[i], nonZeroCheck(selector, field.typ, ctx.qualify))
}
// Now write the fields.
for i, field := range op.optionalFields {
selector := v + "." + field.name
cond := ""
for j := i; j < len(op.optionalFields); j++ {
if j > i {
cond += " || "
}
cond += zeroV[j]
}
fmt.Fprintf(b, "if %s {\n", cond)
fmt.Fprint(b, field.elem.genWrite(ctx, selector))
fmt.Fprintf(b, "}\n")
}
}
func (op structOp) genDecode(ctx *genContext) (string, string) {
// Get the string representation of the type.
// Here, named types are handled separately because the output
// would contain a copy of the struct definition otherwise.
var typeName string
if op.named != nil {
typeName = types.TypeString(op.named, ctx.qualify)
} else {
typeName = types.TypeString(op.typ, ctx.qualify)
}
// Create struct object.
var resultV = ctx.temp()
var b bytes.Buffer
fmt.Fprintf(&b, "var %s %s\n", resultV, typeName)
// Decode fields.
fmt.Fprintf(&b, "{\n")
fmt.Fprintf(&b, "if _, err := dec.List(); err != nil { return err }\n")
for _, field := range op.fields {
result, code := field.elem.genDecode(ctx)
fmt.Fprintf(&b, "// %s:\n", field.name)
fmt.Fprint(&b, code)
fmt.Fprintf(&b, "%s.%s = %s\n", resultV, field.name, result)
}
op.decodeOptionalFields(&b, ctx, resultV)
fmt.Fprintf(&b, "if err := dec.ListEnd(); err != nil { return err }\n")
fmt.Fprintf(&b, "}\n")
return resultV, b.String()
}
func (op structOp) decodeOptionalFields(b *bytes.Buffer, ctx *genContext, resultV string) {
var suffix bytes.Buffer
for _, field := range op.optionalFields {
result, code := field.elem.genDecode(ctx)
fmt.Fprintf(b, "// %s:\n", field.name)
fmt.Fprintf(b, "if dec.MoreDataInList() {\n")
fmt.Fprint(b, code)
fmt.Fprintf(b, "%s.%s = %s\n", resultV, field.name, result)
fmt.Fprintf(&suffix, "}\n")
}
suffix.WriteTo(b)
}
// sliceOp handles slice types.
type sliceOp struct {
typ *types.Slice
elemOp op
}
func (bctx *buildContext) makeSliceOp(typ *types.Slice) (op, error) {
elemOp, err := bctx.makeOp(nil, typ.Elem(), rlpstruct.Tags{})
if err != nil {
return nil, err
}
return sliceOp{typ: typ, elemOp: elemOp}, nil
}
func (op sliceOp) genWrite(ctx *genContext, v string) string {
var (
listMarker = ctx.temp() // holds return value of w.List()
iterElemV = ctx.temp() // iteration variable
elemCode = op.elemOp.genWrite(ctx, iterElemV)
)
var b bytes.Buffer
fmt.Fprintf(&b, "%s := w.List()\n", listMarker)
fmt.Fprintf(&b, "for _, %s := range %s {\n", iterElemV, v)
fmt.Fprint(&b, elemCode)
fmt.Fprintf(&b, "}\n")
fmt.Fprintf(&b, "w.ListEnd(%s)\n", listMarker)
return b.String()
}
func (op sliceOp) genDecode(ctx *genContext) (string, string) {
var sliceV = ctx.temp() // holds the output slice
elemResult, elemCode := op.elemOp.genDecode(ctx)
var b bytes.Buffer
fmt.Fprintf(&b, "var %s %s\n", sliceV, types.TypeString(op.typ, ctx.qualify))
fmt.Fprintf(&b, "if _, err := dec.List(); err != nil { return err }\n")
fmt.Fprintf(&b, "for dec.MoreDataInList() {\n")
fmt.Fprintf(&b, " %s", elemCode)
fmt.Fprintf(&b, " %s = append(%s, %s)\n", sliceV, sliceV, elemResult)
fmt.Fprintf(&b, "}\n")
fmt.Fprintf(&b, "if err := dec.ListEnd(); err != nil { return err }\n")
return sliceV, b.String()
}
func (bctx *buildContext) makeOp(name *types.Named, typ types.Type, tags rlpstruct.Tags) (op, error) {
switch typ := typ.(type) {
case *types.Named:
if isBigInt(typ) {
return bigIntOp{}, nil
}
if typ == bctx.rawValueType {
return bctx.makeRawValueOp(), nil
}
if bctx.isDecoder(typ) {
return nil, fmt.Errorf("type %v implements rlp.Decoder with non-pointer receiver", typ)
}
// TODO: same check for encoder?
return bctx.makeOp(typ, typ.Underlying(), tags)
case *types.Pointer:
if isBigInt(typ.Elem()) {
return bigIntOp{pointer: true}, nil
}
// Encoder/Decoder interfaces.
if bctx.isEncoder(typ) {
if bctx.isDecoder(typ) {
return encoderDecoderOp{typ}, nil
}
return nil, fmt.Errorf("type %v implements rlp.Encoder but not rlp.Decoder", typ)
}
if bctx.isDecoder(typ) {
return nil, fmt.Errorf("type %v implements rlp.Decoder but not rlp.Encoder", typ)
}
// Default pointer handling.
return bctx.makePtrOp(typ.Elem(), tags)
case *types.Basic:
return bctx.makeBasicOp(typ)
case *types.Struct:
return bctx.makeStructOp(name, typ)
case *types.Slice:
etyp := typ.Elem()
if isByte(etyp) && !bctx.isEncoder(etyp) {
return bctx.makeByteSliceOp(typ), nil
}
return bctx.makeSliceOp(typ)
case *types.Array:
etyp := typ.Elem()
if isByte(etyp) && !bctx.isEncoder(etyp) {
return bctx.makeByteArrayOp(name, typ), nil
}
return nil, fmt.Errorf("unhandled array type: %v", typ)
default:
return nil, fmt.Errorf("unhandled type: %v", typ)
}
}
// generateDecoder generates the DecodeRLP method on 'typ'.
func generateDecoder(ctx *genContext, typ string, op op) []byte {
ctx.resetTemp()
ctx.addImport(pathOfPackageRLP)
result, code := op.genDecode(ctx)
var b bytes.Buffer
fmt.Fprintf(&b, "func (obj *%s) DecodeRLP(dec *rlp.Stream) error {\n", typ)
fmt.Fprint(&b, code)
fmt.Fprintf(&b, " *obj = %s\n", result)
fmt.Fprintf(&b, " return nil\n")
fmt.Fprintf(&b, "}\n")
return b.Bytes()
}
// generateEncoder generates the EncodeRLP method on 'typ'.
func generateEncoder(ctx *genContext, typ string, op op) []byte {
ctx.resetTemp()
ctx.addImport("io")
ctx.addImport(pathOfPackageRLP)
var b bytes.Buffer
fmt.Fprintf(&b, "func (obj *%s) EncodeRLP(_w io.Writer) error {\n", typ)
fmt.Fprintf(&b, " w := rlp.NewEncoderBuffer(_w)\n")
fmt.Fprint(&b, op.genWrite(ctx, "obj"))
fmt.Fprintf(&b, " return w.Flush()\n")
fmt.Fprintf(&b, "}\n")
return b.Bytes()
}
func (bctx *buildContext) generate(typ *types.Named, encoder, decoder bool) ([]byte, error) {
bctx.topType = typ
pkg := typ.Obj().Pkg()
op, err := bctx.makeOp(nil, typ, rlpstruct.Tags{})
if err != nil {
return nil, err
}
var (
ctx = newGenContext(pkg)
encSource []byte
decSource []byte
)
if encoder {
encSource = generateEncoder(ctx, typ.Obj().Name(), op)
}
if decoder {
decSource = generateDecoder(ctx, typ.Obj().Name(), op)
}
var b bytes.Buffer
fmt.Fprintf(&b, "package %s\n\n", pkg.Name())
for _, imp := range ctx.importsList() {
fmt.Fprintf(&b, "import %q\n", imp)
}
if encoder {
fmt.Fprintln(&b)
b.Write(encSource)
}
if decoder {
fmt.Fprintln(&b)
b.Write(decSource)
}
source := b.Bytes()
// fmt.Println(string(source))
return format.Source(source)
}

92
rlp/rlpgen/gen_test.go Normal file
View File

@ -0,0 +1,92 @@
package main
import (
"bytes"
"fmt"
"go/ast"
"go/importer"
"go/parser"
"go/token"
"go/types"
"io/ioutil"
"os"
"path/filepath"
"testing"
)
// Package RLP is loaded only once and reused for all tests.
var (
testFset = token.NewFileSet()
testImporter = importer.ForCompiler(testFset, "source", nil).(types.ImporterFrom)
testPackageRLP *types.Package
)
func init() {
cwd, err := os.Getwd()
if err != nil {
panic(err)
}
testPackageRLP, err = testImporter.ImportFrom(pathOfPackageRLP, cwd, 0)
if err != nil {
panic(fmt.Errorf("can't load package RLP: %v", err))
}
}
var tests = []string{"uints", "nil", "rawvalue", "optional", "bigint"}
func TestOutput(t *testing.T) {
for _, test := range tests {
test := test
t.Run(test, func(t *testing.T) {
inputFile := filepath.Join("testdata", test+".in.txt")
outputFile := filepath.Join("testdata", test+".out.txt")
bctx, typ, err := loadTestSource(inputFile, "Test")
if err != nil {
t.Fatal("error loading test source:", err)
}
output, err := bctx.generate(typ, true, true)
if err != nil {
t.Fatal("error in generate:", err)
}
// Set this environment variable to regenerate the test outputs.
if os.Getenv("WRITE_TEST_FILES") != "" {
ioutil.WriteFile(outputFile, output, 0644)
}
// Check if output matches.
wantOutput, err := ioutil.ReadFile(outputFile)
if err != nil {
t.Fatal("error loading expected test output:", err)
}
if !bytes.Equal(output, wantOutput) {
t.Fatal("output mismatch:\n", string(output))
}
})
}
}
func loadTestSource(file string, typeName string) (*buildContext, *types.Named, error) {
// Load the test input.
content, err := ioutil.ReadFile(file)
if err != nil {
return nil, nil, err
}
f, err := parser.ParseFile(testFset, file, content, 0)
if err != nil {
return nil, nil, err
}
conf := types.Config{Importer: testImporter}
pkg, err := conf.Check("test", testFset, []*ast.File{f}, nil)
if err != nil {
return nil, nil, err
}
// Find the test struct.
bctx := newBuildContext(testPackageRLP)
typ, err := lookupStructType(pkg.Scope(), typeName)
if err != nil {
return nil, nil, fmt.Errorf("can't find type %s: %v", typeName, err)
}
return bctx, typ, nil
}

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// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"bytes"
"errors"
"flag"
"fmt"
"go/types"
"io/ioutil"
"os"
"golang.org/x/tools/go/packages"
)
const pathOfPackageRLP = "github.com/ethereum/go-ethereum/rlp"
func main() {
var (
pkgdir = flag.String("dir", ".", "input package")
output = flag.String("out", "-", "output file (default is stdout)")
genEncoder = flag.Bool("encoder", true, "generate EncodeRLP?")
genDecoder = flag.Bool("decoder", false, "generate DecodeRLP?")
typename = flag.String("type", "", "type to generate methods for")
)
flag.Parse()
cfg := Config{
Dir: *pkgdir,
Type: *typename,
GenerateEncoder: *genEncoder,
GenerateDecoder: *genDecoder,
}
code, err := cfg.process()
if err != nil {
fatal(err)
}
if *output == "-" {
os.Stdout.Write(code)
} else if err := ioutil.WriteFile(*output, code, 0644); err != nil {
fatal(err)
}
}
func fatal(args ...interface{}) {
fmt.Fprintln(os.Stderr, args...)
os.Exit(1)
}
type Config struct {
Dir string // input package directory
Type string
GenerateEncoder bool
GenerateDecoder bool
}
// process generates the Go code.
func (cfg *Config) process() (code []byte, err error) {
// Load packages.
pcfg := &packages.Config{
Mode: packages.NeedName | packages.NeedTypes | packages.NeedImports | packages.NeedDeps,
Dir: cfg.Dir,
BuildFlags: []string{"-tags", "norlpgen"},
}
ps, err := packages.Load(pcfg, pathOfPackageRLP, ".")
if err != nil {
return nil, err
}
if len(ps) == 0 {
return nil, fmt.Errorf("no Go package found in %s", cfg.Dir)
}
packages.PrintErrors(ps)
// Find the packages that were loaded.
var (
pkg *types.Package
packageRLP *types.Package
)
for _, p := range ps {
if len(p.Errors) > 0 {
return nil, fmt.Errorf("package %s has errors", p.PkgPath)
}
if p.PkgPath == pathOfPackageRLP {
packageRLP = p.Types
} else {
pkg = p.Types
}
}
bctx := newBuildContext(packageRLP)
// Find the type and generate.
typ, err := lookupStructType(pkg.Scope(), cfg.Type)
if err != nil {
return nil, fmt.Errorf("can't find %s in %s: %v", typ, pkg, err)
}
code, err = bctx.generate(typ, cfg.GenerateEncoder, cfg.GenerateDecoder)
if err != nil {
return nil, err
}
// Add build comments.
// This is done here to avoid processing these lines with gofmt.
var header bytes.Buffer
fmt.Fprint(&header, "// Code generated by rlpgen. DO NOT EDIT.\n\n")
fmt.Fprint(&header, "//go:build !norlpgen\n")
fmt.Fprint(&header, "// +build !norlpgen\n\n")
return append(header.Bytes(), code...), nil
}
func lookupStructType(scope *types.Scope, name string) (*types.Named, error) {
typ, err := lookupType(scope, name)
if err != nil {
return nil, err
}
_, ok := typ.Underlying().(*types.Struct)
if !ok {
return nil, errors.New("not a struct type")
}
return typ, nil
}
func lookupType(scope *types.Scope, name string) (*types.Named, error) {
obj := scope.Lookup(name)
if obj == nil {
return nil, errors.New("no such identifier")
}
typ, ok := obj.(*types.TypeName)
if !ok {
return nil, errors.New("not a type")
}
return typ.Type().(*types.Named), nil
}

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rlp/rlpgen/testdata/bigint.in.txt vendored Normal file
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// -*- mode: go -*-
package test
import "math/big"
type Test struct {
Int *big.Int
IntNoPtr big.Int
}

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rlp/rlpgen/testdata/bigint.out.txt vendored Normal file
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package test
import "github.com/ethereum/go-ethereum/rlp"
import "io"
func (obj *Test) EncodeRLP(_w io.Writer) error {
w := rlp.NewEncoderBuffer(_w)
_tmp0 := w.List()
if obj.Int == nil {
w.Write(rlp.EmptyString)
} else {
if obj.Int.Sign() == -1 {
return rlp.ErrNegativeBigInt
}
w.WriteBigInt(obj.Int)
}
if obj.IntNoPtr.Sign() == -1 {
return rlp.ErrNegativeBigInt
}
w.WriteBigInt(&obj.IntNoPtr)
w.ListEnd(_tmp0)
return w.Flush()
}
func (obj *Test) DecodeRLP(dec *rlp.Stream) error {
var _tmp0 Test
{
if _, err := dec.List(); err != nil {
return err
}
// Int:
_tmp1, err := dec.BigInt()
if err != nil {
return err
}
_tmp0.Int = _tmp1
// IntNoPtr:
_tmp2, err := dec.BigInt()
if err != nil {
return err
}
_tmp0.IntNoPtr = (*_tmp2)
if err := dec.ListEnd(); err != nil {
return err
}
}
*obj = _tmp0
return nil
}

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rlp/rlpgen/testdata/nil.in.txt vendored Normal file
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// -*- mode: go -*-
package test
type Aux struct{
A uint32
}
type Test struct{
Uint8 *byte `rlp:"nil"`
Uint8List *byte `rlp:"nilList"`
Uint32 *uint32 `rlp:"nil"`
Uint32List *uint32 `rlp:"nilList"`
Uint64 *uint64 `rlp:"nil"`
Uint64List *uint64 `rlp:"nilList"`
String *string `rlp:"nil"`
StringList *string `rlp:"nilList"`
ByteArray *[3]byte `rlp:"nil"`
ByteArrayList *[3]byte `rlp:"nilList"`
ByteSlice *[]byte `rlp:"nil"`
ByteSliceList *[]byte `rlp:"nilList"`
Struct *Aux `rlp:"nil"`
StructString *Aux `rlp:"nilString"`
}

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package test
import "github.com/ethereum/go-ethereum/rlp"
import "io"
func (obj *Test) EncodeRLP(_w io.Writer) error {
w := rlp.NewEncoderBuffer(_w)
_tmp0 := w.List()
if obj.Uint8 == nil {
w.Write([]byte{0x80})
} else {
w.WriteUint64(uint64((*obj.Uint8)))
}
if obj.Uint8List == nil {
w.Write([]byte{0xC0})
} else {
w.WriteUint64(uint64((*obj.Uint8List)))
}
if obj.Uint32 == nil {
w.Write([]byte{0x80})
} else {
w.WriteUint64(uint64((*obj.Uint32)))
}
if obj.Uint32List == nil {
w.Write([]byte{0xC0})
} else {
w.WriteUint64(uint64((*obj.Uint32List)))
}
if obj.Uint64 == nil {
w.Write([]byte{0x80})
} else {
w.WriteUint64((*obj.Uint64))
}
if obj.Uint64List == nil {
w.Write([]byte{0xC0})
} else {
w.WriteUint64((*obj.Uint64List))
}
if obj.String == nil {
w.Write([]byte{0x80})
} else {
w.WriteString((*obj.String))
}
if obj.StringList == nil {
w.Write([]byte{0xC0})
} else {
w.WriteString((*obj.StringList))
}
if obj.ByteArray == nil {
w.Write([]byte{0x80})
} else {
w.WriteBytes(obj.ByteArray[:])
}
if obj.ByteArrayList == nil {
w.Write([]byte{0xC0})
} else {
w.WriteBytes(obj.ByteArrayList[:])
}
if obj.ByteSlice == nil {
w.Write([]byte{0x80})
} else {
w.WriteBytes((*obj.ByteSlice))
}
if obj.ByteSliceList == nil {
w.Write([]byte{0xC0})
} else {
w.WriteBytes((*obj.ByteSliceList))
}
if obj.Struct == nil {
w.Write([]byte{0xC0})
} else {
_tmp1 := w.List()
w.WriteUint64(uint64(obj.Struct.A))
w.ListEnd(_tmp1)
}
if obj.StructString == nil {
w.Write([]byte{0x80})
} else {
_tmp2 := w.List()
w.WriteUint64(uint64(obj.StructString.A))
w.ListEnd(_tmp2)
}
w.ListEnd(_tmp0)
return w.Flush()
}
func (obj *Test) DecodeRLP(dec *rlp.Stream) error {
var _tmp0 Test
{
if _, err := dec.List(); err != nil {
return err
}
// Uint8:
var _tmp2 *byte
if _tmp3, _tmp4, err := dec.Kind(); err != nil {
return err
} else if _tmp4 != 0 || _tmp3 != rlp.String {
_tmp1, err := dec.Uint8()
if err != nil {
return err
}
_tmp2 = &_tmp1
}
_tmp0.Uint8 = _tmp2
// Uint8List:
var _tmp6 *byte
if _tmp7, _tmp8, err := dec.Kind(); err != nil {
return err
} else if _tmp8 != 0 || _tmp7 != rlp.List {
_tmp5, err := dec.Uint8()
if err != nil {
return err
}
_tmp6 = &_tmp5
}
_tmp0.Uint8List = _tmp6
// Uint32:
var _tmp10 *uint32
if _tmp11, _tmp12, err := dec.Kind(); err != nil {
return err
} else if _tmp12 != 0 || _tmp11 != rlp.String {
_tmp9, err := dec.Uint32()
if err != nil {
return err
}
_tmp10 = &_tmp9
}
_tmp0.Uint32 = _tmp10
// Uint32List:
var _tmp14 *uint32
if _tmp15, _tmp16, err := dec.Kind(); err != nil {
return err
} else if _tmp16 != 0 || _tmp15 != rlp.List {
_tmp13, err := dec.Uint32()
if err != nil {
return err
}
_tmp14 = &_tmp13
}
_tmp0.Uint32List = _tmp14
// Uint64:
var _tmp18 *uint64
if _tmp19, _tmp20, err := dec.Kind(); err != nil {
return err
} else if _tmp20 != 0 || _tmp19 != rlp.String {
_tmp17, err := dec.Uint64()
if err != nil {
return err
}
_tmp18 = &_tmp17
}
_tmp0.Uint64 = _tmp18
// Uint64List:
var _tmp22 *uint64
if _tmp23, _tmp24, err := dec.Kind(); err != nil {
return err
} else if _tmp24 != 0 || _tmp23 != rlp.List {
_tmp21, err := dec.Uint64()
if err != nil {
return err
}
_tmp22 = &_tmp21
}
_tmp0.Uint64List = _tmp22
// String:
var _tmp26 *string
if _tmp27, _tmp28, err := dec.Kind(); err != nil {
return err
} else if _tmp28 != 0 || _tmp27 != rlp.String {
_tmp25, err := dec.String()
if err != nil {
return err
}
_tmp26 = &_tmp25
}
_tmp0.String = _tmp26
// StringList:
var _tmp30 *string
if _tmp31, _tmp32, err := dec.Kind(); err != nil {
return err
} else if _tmp32 != 0 || _tmp31 != rlp.List {
_tmp29, err := dec.String()
if err != nil {
return err
}
_tmp30 = &_tmp29
}
_tmp0.StringList = _tmp30
// ByteArray:
var _tmp34 *[3]byte
if _tmp35, _tmp36, err := dec.Kind(); err != nil {
return err
} else if _tmp36 != 0 || _tmp35 != rlp.String {
var _tmp33 [3]byte
if err := dec.ReadBytes(_tmp33[:]); err != nil {
return err
}
_tmp34 = &_tmp33
}
_tmp0.ByteArray = _tmp34
// ByteArrayList:
var _tmp38 *[3]byte
if _tmp39, _tmp40, err := dec.Kind(); err != nil {
return err
} else if _tmp40 != 0 || _tmp39 != rlp.List {
var _tmp37 [3]byte
if err := dec.ReadBytes(_tmp37[:]); err != nil {
return err
}
_tmp38 = &_tmp37
}
_tmp0.ByteArrayList = _tmp38
// ByteSlice:
var _tmp42 *[]byte
if _tmp43, _tmp44, err := dec.Kind(); err != nil {
return err
} else if _tmp44 != 0 || _tmp43 != rlp.String {
_tmp41, err := dec.Bytes()
if err != nil {
return err
}
_tmp42 = &_tmp41
}
_tmp0.ByteSlice = _tmp42
// ByteSliceList:
var _tmp46 *[]byte
if _tmp47, _tmp48, err := dec.Kind(); err != nil {
return err
} else if _tmp48 != 0 || _tmp47 != rlp.List {
_tmp45, err := dec.Bytes()
if err != nil {
return err
}
_tmp46 = &_tmp45
}
_tmp0.ByteSliceList = _tmp46
// Struct:
var _tmp51 *Aux
if _tmp52, _tmp53, err := dec.Kind(); err != nil {
return err
} else if _tmp53 != 0 || _tmp52 != rlp.List {
var _tmp49 Aux
{
if _, err := dec.List(); err != nil {
return err
}
// A:
_tmp50, err := dec.Uint32()
if err != nil {
return err
}
_tmp49.A = _tmp50
if err := dec.ListEnd(); err != nil {
return err
}
}
_tmp51 = &_tmp49
}
_tmp0.Struct = _tmp51
// StructString:
var _tmp56 *Aux
if _tmp57, _tmp58, err := dec.Kind(); err != nil {
return err
} else if _tmp58 != 0 || _tmp57 != rlp.String {
var _tmp54 Aux
{
if _, err := dec.List(); err != nil {
return err
}
// A:
_tmp55, err := dec.Uint32()
if err != nil {
return err
}
_tmp54.A = _tmp55
if err := dec.ListEnd(); err != nil {
return err
}
}
_tmp56 = &_tmp54
}
_tmp0.StructString = _tmp56
if err := dec.ListEnd(); err != nil {
return err
}
}
*obj = _tmp0
return nil
}

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rlp/rlpgen/testdata/optional.in.txt vendored Normal file
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// -*- mode: go -*-
package test
type Aux struct {
A uint64
}
type Test struct {
Uint64 uint64 `rlp:"optional"`
Pointer *uint64 `rlp:"optional"`
String string `rlp:"optional"`
Slice []uint64 `rlp:"optional"`
Array [3]byte `rlp:"optional"`
NamedStruct Aux `rlp:"optional"`
AnonStruct struct{ A string } `rlp:"optional"`
}

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rlp/rlpgen/testdata/optional.out.txt vendored Normal file
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package test
import "github.com/ethereum/go-ethereum/rlp"
import "io"
func (obj *Test) EncodeRLP(_w io.Writer) error {
w := rlp.NewEncoderBuffer(_w)
_tmp0 := w.List()
_tmp1 := obj.Uint64 != 0
_tmp2 := obj.Pointer != nil
_tmp3 := obj.String != ""
_tmp4 := len(obj.Slice) > 0
_tmp5 := obj.Array != ([3]byte{})
_tmp6 := obj.NamedStruct != (Aux{})
_tmp7 := obj.AnonStruct != (struct{ A string }{})
if _tmp1 || _tmp2 || _tmp3 || _tmp4 || _tmp5 || _tmp6 || _tmp7 {
w.WriteUint64(obj.Uint64)
}
if _tmp2 || _tmp3 || _tmp4 || _tmp5 || _tmp6 || _tmp7 {
if obj.Pointer == nil {
w.Write([]byte{0x80})
} else {
w.WriteUint64((*obj.Pointer))
}
}
if _tmp3 || _tmp4 || _tmp5 || _tmp6 || _tmp7 {
w.WriteString(obj.String)
}
if _tmp4 || _tmp5 || _tmp6 || _tmp7 {
_tmp8 := w.List()
for _, _tmp9 := range obj.Slice {
w.WriteUint64(_tmp9)
}
w.ListEnd(_tmp8)
}
if _tmp5 || _tmp6 || _tmp7 {
w.WriteBytes(obj.Array[:])
}
if _tmp6 || _tmp7 {
_tmp10 := w.List()
w.WriteUint64(obj.NamedStruct.A)
w.ListEnd(_tmp10)
}
if _tmp7 {
_tmp11 := w.List()
w.WriteString(obj.AnonStruct.A)
w.ListEnd(_tmp11)
}
w.ListEnd(_tmp0)
return w.Flush()
}
func (obj *Test) DecodeRLP(dec *rlp.Stream) error {
var _tmp0 Test
{
if _, err := dec.List(); err != nil {
return err
}
// Uint64:
if dec.MoreDataInList() {
_tmp1, err := dec.Uint64()
if err != nil {
return err
}
_tmp0.Uint64 = _tmp1
// Pointer:
if dec.MoreDataInList() {
_tmp2, err := dec.Uint64()
if err != nil {
return err
}
_tmp0.Pointer = &_tmp2
// String:
if dec.MoreDataInList() {
_tmp3, err := dec.String()
if err != nil {
return err
}
_tmp0.String = _tmp3
// Slice:
if dec.MoreDataInList() {
var _tmp4 []uint64
if _, err := dec.List(); err != nil {
return err
}
for dec.MoreDataInList() {
_tmp5, err := dec.Uint64()
if err != nil {
return err
}
_tmp4 = append(_tmp4, _tmp5)
}
if err := dec.ListEnd(); err != nil {
return err
}
_tmp0.Slice = _tmp4
// Array:
if dec.MoreDataInList() {
var _tmp6 [3]byte
if err := dec.ReadBytes(_tmp6[:]); err != nil {
return err
}
_tmp0.Array = _tmp6
// NamedStruct:
if dec.MoreDataInList() {
var _tmp7 Aux
{
if _, err := dec.List(); err != nil {
return err
}
// A:
_tmp8, err := dec.Uint64()
if err != nil {
return err
}
_tmp7.A = _tmp8
if err := dec.ListEnd(); err != nil {
return err
}
}
_tmp0.NamedStruct = _tmp7
// AnonStruct:
if dec.MoreDataInList() {
var _tmp9 struct{ A string }
{
if _, err := dec.List(); err != nil {
return err
}
// A:
_tmp10, err := dec.String()
if err != nil {
return err
}
_tmp9.A = _tmp10
if err := dec.ListEnd(); err != nil {
return err
}
}
_tmp0.AnonStruct = _tmp9
}
}
}
}
}
}
}
if err := dec.ListEnd(); err != nil {
return err
}
}
*obj = _tmp0
return nil
}

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rlp/rlpgen/testdata/rawvalue.in.txt vendored Normal file
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// -*- mode: go -*-
package test
import "github.com/ethereum/go-ethereum/rlp"
type Test struct {
RawValue rlp.RawValue
PointerToRawValue *rlp.RawValue
SliceOfRawValue []rlp.RawValue
}

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rlp/rlpgen/testdata/rawvalue.out.txt vendored Normal file
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@ -0,0 +1,64 @@
package test
import "github.com/ethereum/go-ethereum/rlp"
import "io"
func (obj *Test) EncodeRLP(_w io.Writer) error {
w := rlp.NewEncoderBuffer(_w)
_tmp0 := w.List()
w.Write(obj.RawValue)
if obj.PointerToRawValue == nil {
w.Write([]byte{0x80})
} else {
w.Write((*obj.PointerToRawValue))
}
_tmp1 := w.List()
for _, _tmp2 := range obj.SliceOfRawValue {
w.Write(_tmp2)
}
w.ListEnd(_tmp1)
w.ListEnd(_tmp0)
return w.Flush()
}
func (obj *Test) DecodeRLP(dec *rlp.Stream) error {
var _tmp0 Test
{
if _, err := dec.List(); err != nil {
return err
}
// RawValue:
_tmp1, err := dec.Raw()
if err != nil {
return err
}
_tmp0.RawValue = _tmp1
// PointerToRawValue:
_tmp2, err := dec.Raw()
if err != nil {
return err
}
_tmp0.PointerToRawValue = &_tmp2
// SliceOfRawValue:
var _tmp3 []rlp.RawValue
if _, err := dec.List(); err != nil {
return err
}
for dec.MoreDataInList() {
_tmp4, err := dec.Raw()
if err != nil {
return err
}
_tmp3 = append(_tmp3, _tmp4)
}
if err := dec.ListEnd(); err != nil {
return err
}
_tmp0.SliceOfRawValue = _tmp3
if err := dec.ListEnd(); err != nil {
return err
}
}
*obj = _tmp0
return nil
}

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rlp/rlpgen/testdata/uints.in.txt vendored Normal file
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// -*- mode: go -*-
package test
type Test struct{
A uint8
B uint16
C uint32
D uint64
}

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rlp/rlpgen/testdata/uints.out.txt vendored Normal file
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package test
import "github.com/ethereum/go-ethereum/rlp"
import "io"
func (obj *Test) EncodeRLP(_w io.Writer) error {
w := rlp.NewEncoderBuffer(_w)
_tmp0 := w.List()
w.WriteUint64(uint64(obj.A))
w.WriteUint64(uint64(obj.B))
w.WriteUint64(uint64(obj.C))
w.WriteUint64(obj.D)
w.ListEnd(_tmp0)
return w.Flush()
}
func (obj *Test) DecodeRLP(dec *rlp.Stream) error {
var _tmp0 Test
{
if _, err := dec.List(); err != nil {
return err
}
// A:
_tmp1, err := dec.Uint8()
if err != nil {
return err
}
_tmp0.A = _tmp1
// B:
_tmp2, err := dec.Uint16()
if err != nil {
return err
}
_tmp0.B = _tmp2
// C:
_tmp3, err := dec.Uint32()
if err != nil {
return err
}
_tmp0.C = _tmp3
// D:
_tmp4, err := dec.Uint64()
if err != nil {
return err
}
_tmp0.D = _tmp4
if err := dec.ListEnd(); err != nil {
return err
}
}
*obj = _tmp0
return nil
}

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rlp/rlpgen/types.go Normal file
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package main
import (
"fmt"
"go/types"
"reflect"
)
// typeReflectKind gives the reflect.Kind that represents typ.
func typeReflectKind(typ types.Type) reflect.Kind {
switch typ := typ.(type) {
case *types.Basic:
k := typ.Kind()
if k >= types.Bool && k <= types.Complex128 {
// value order matches for Bool..Complex128
return reflect.Bool + reflect.Kind(k-types.Bool)
}
if k == types.String {
return reflect.String
}
if k == types.UnsafePointer {
return reflect.UnsafePointer
}
panic(fmt.Errorf("unhandled BasicKind %v", k))
case *types.Array:
return reflect.Array
case *types.Chan:
return reflect.Chan
case *types.Interface:
return reflect.Interface
case *types.Map:
return reflect.Map
case *types.Pointer:
return reflect.Ptr
case *types.Signature:
return reflect.Func
case *types.Slice:
return reflect.Slice
case *types.Struct:
return reflect.Struct
default:
panic(fmt.Errorf("unhandled type %T", typ))
}
}
// nonZeroCheck returns the expression that checks whether 'v' is a non-zero value of type 'vtyp'.
func nonZeroCheck(v string, vtyp types.Type, qualify types.Qualifier) string {
// Resolve type name.
typ := resolveUnderlying(vtyp)
switch typ := typ.(type) {
case *types.Basic:
k := typ.Kind()
switch {
case k == types.Bool:
return v
case k >= types.Uint && k <= types.Complex128:
return fmt.Sprintf("%s != 0", v)
case k == types.String:
return fmt.Sprintf(`%s != ""`, v)
default:
panic(fmt.Errorf("unhandled BasicKind %v", k))
}
case *types.Array, *types.Struct:
return fmt.Sprintf("%s != (%s{})", v, types.TypeString(vtyp, qualify))
case *types.Interface, *types.Pointer, *types.Signature:
return fmt.Sprintf("%s != nil", v)
case *types.Slice, *types.Map:
return fmt.Sprintf("len(%s) > 0", v)
default:
panic(fmt.Errorf("unhandled type %T", typ))
}
}
// isBigInt checks whether 'typ' is "math/big".Int.
func isBigInt(typ types.Type) bool {
named, ok := typ.(*types.Named)
if !ok {
return false
}
name := named.Obj()
return name.Pkg().Path() == "math/big" && name.Name() == "Int"
}
// isByte checks whether the underlying type of 'typ' is uint8.
func isByte(typ types.Type) bool {
basic, ok := resolveUnderlying(typ).(*types.Basic)
return ok && basic.Kind() == types.Uint8
}
func resolveUnderlying(typ types.Type) types.Type {
for {
t := typ.Underlying()
if t == typ {
return t
}
typ = t
}
}

193
rlp/typecache.go
View File

@ -19,9 +19,10 @@ package rlp
import (
"fmt"
"reflect"
"strings"
"sync"
"sync/atomic"
"github.com/ethereum/go-ethereum/rlp/internal/rlpstruct"
)
// typeinfo is an entry in the type cache.
@ -32,35 +33,16 @@ type typeinfo struct {
writerErr error // error from makeWriter
}
// tags represents struct tags.
type tags struct {
// rlp:"nil" controls whether empty input results in a nil pointer.
// nilKind is the kind of empty value allowed for the field.
nilKind Kind
nilOK bool
// rlp:"optional" allows for a field to be missing in the input list.
// If this is set, all subsequent fields must also be optional.
optional bool
// rlp:"tail" controls whether this field swallows additional list elements. It can
// only be set for the last field, which must be of slice type.
tail bool
// rlp:"-" ignores fields.
ignored bool
}
// typekey is the key of a type in typeCache. It includes the struct tags because
// they might generate a different decoder.
type typekey struct {
reflect.Type
tags
rlpstruct.Tags
}
type decoder func(*Stream, reflect.Value) error
type writer func(reflect.Value, *encbuf) error
type writer func(reflect.Value, *encBuffer) error
var theTC = newTypeCache()
@ -95,10 +77,10 @@ func (c *typeCache) info(typ reflect.Type) *typeinfo {
}
// Not in the cache, need to generate info for this type.
return c.generate(typ, tags{})
return c.generate(typ, rlpstruct.Tags{})
}
func (c *typeCache) generate(typ reflect.Type, tags tags) *typeinfo {
func (c *typeCache) generate(typ reflect.Type, tags rlpstruct.Tags) *typeinfo {
c.mu.Lock()
defer c.mu.Unlock()
@ -122,7 +104,7 @@ func (c *typeCache) generate(typ reflect.Type, tags tags) *typeinfo {
return info
}
func (c *typeCache) infoWhileGenerating(typ reflect.Type, tags tags) *typeinfo {
func (c *typeCache) infoWhileGenerating(typ reflect.Type, tags rlpstruct.Tags) *typeinfo {
key := typekey{typ, tags}
if info := c.next[key]; info != nil {
return info
@ -144,35 +126,40 @@ type field struct {
// structFields resolves the typeinfo of all public fields in a struct type.
func structFields(typ reflect.Type) (fields []field, err error) {
var (
lastPublic = lastPublicField(typ)
anyOptional = false
)
// Convert fields to rlpstruct.Field.
var allStructFields []rlpstruct.Field
for i := 0; i < typ.NumField(); i++ {
if f := typ.Field(i); f.PkgPath == "" { // exported
tags, err := parseStructTag(typ, i, lastPublic)
rf := typ.Field(i)
allStructFields = append(allStructFields, rlpstruct.Field{
Name: rf.Name,
Index: i,
Exported: rf.PkgPath == "",
Tag: string(rf.Tag),
Type: *rtypeToStructType(rf.Type, nil),
})
}
// Filter/validate fields.
structFields, structTags, err := rlpstruct.ProcessFields(allStructFields)
if err != nil {
if tagErr, ok := err.(rlpstruct.TagError); ok {
tagErr.StructType = typ.String()
return nil, tagErr
}
return nil, err
}
// Skip rlp:"-" fields.
if tags.ignored {
continue
}
// If any field has the "optional" tag, subsequent fields must also have it.
if tags.optional || tags.tail {
anyOptional = true
} else if anyOptional {
return nil, fmt.Errorf(`rlp: struct field %v.%s needs "optional" tag`, typ, f.Name)
}
info := theTC.infoWhileGenerating(f.Type, tags)
fields = append(fields, field{i, info, tags.optional})
}
// Resolve typeinfo.
for i, sf := range structFields {
typ := typ.Field(sf.Index).Type
tags := structTags[i]
info := theTC.infoWhileGenerating(typ, tags)
fields = append(fields, field{sf.Index, info, tags.Optional})
}
return fields, nil
}
// anyOptionalFields returns the index of the first field with "optional" tag.
// firstOptionalField returns the index of the first field with "optional" tag.
func firstOptionalField(fields []field) int {
for i, f := range fields {
if f.optional {
@ -192,82 +179,56 @@ func (e structFieldError) Error() string {
return fmt.Sprintf("%v (struct field %v.%s)", e.err, e.typ, e.typ.Field(e.field).Name)
}
type structTagError struct {
typ reflect.Type
field, tag, err string
}
func (e structTagError) Error() string {
return fmt.Sprintf("rlp: invalid struct tag %q for %v.%s (%s)", e.tag, e.typ, e.field, e.err)
}
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"), ",") {
switch t = strings.TrimSpace(t); t {
case "":
case "-":
ts.ignored = true
case "nil", "nilString", "nilList":
ts.nilOK = true
if f.Type.Kind() != reflect.Ptr {
return ts, structTagError{typ, f.Name, t, "field is not a pointer"}
}
switch t {
case "nil":
ts.nilKind = defaultNilKind(f.Type.Elem())
case "nilString":
ts.nilKind = String
case "nilList":
ts.nilKind = List
}
case "optional":
ts.optional = true
if ts.tail {
return ts, structTagError{typ, f.Name, t, `also has "tail" tag`}
}
case "tail":
ts.tail = true
if fi != lastPublic {
return ts, structTagError{typ, f.Name, t, "must be on last field"}
}
if ts.optional {
return ts, structTagError{typ, f.Name, t, `also has "optional" tag`}
}
if f.Type.Kind() != reflect.Slice {
return ts, structTagError{typ, f.Name, t, "field type is not slice"}
}
default:
return ts, fmt.Errorf("rlp: unknown struct tag %q on %v.%s", t, typ, f.Name)
}
}
return ts, nil
}
func lastPublicField(typ reflect.Type) int {
last := 0
for i := 0; i < typ.NumField(); i++ {
if typ.Field(i).PkgPath == "" {
last = i
}
}
return last
}
func (i *typeinfo) generate(typ reflect.Type, tags tags) {
func (i *typeinfo) generate(typ reflect.Type, tags rlpstruct.Tags) {
i.decoder, i.decoderErr = makeDecoder(typ, tags)
i.writer, i.writerErr = makeWriter(typ, tags)
}
// defaultNilKind determines whether a nil pointer to typ encodes/decodes
// as an empty string or empty list.
func defaultNilKind(typ reflect.Type) Kind {
// rtypeToStructType converts typ to rlpstruct.Type.
func rtypeToStructType(typ reflect.Type, rec map[reflect.Type]*rlpstruct.Type) *rlpstruct.Type {
k := typ.Kind()
if isUint(k) || k == reflect.String || k == reflect.Bool || isByteArray(typ) {
return String
if k == reflect.Invalid {
panic("invalid kind")
}
if prev := rec[typ]; prev != nil {
return prev // short-circuit for recursive types
}
if rec == nil {
rec = make(map[reflect.Type]*rlpstruct.Type)
}
t := &rlpstruct.Type{
Name: typ.String(),
Kind: k,
IsEncoder: typ.Implements(encoderInterface),
IsDecoder: typ.Implements(decoderInterface),
}
rec[typ] = t
if k == reflect.Array || k == reflect.Slice || k == reflect.Ptr {
t.Elem = rtypeToStructType(typ.Elem(), rec)
}
return t
}
// typeNilKind gives the RLP value kind for nil pointers to 'typ'.
func typeNilKind(typ reflect.Type, tags rlpstruct.Tags) Kind {
styp := rtypeToStructType(typ, nil)
var nk rlpstruct.NilKind
if tags.NilOK {
nk = tags.NilKind
} else {
nk = styp.DefaultNilValue()
}
switch nk {
case rlpstruct.NilKindString:
return String
case rlpstruct.NilKindList:
return List
default:
panic("invalid nil kind value")
}
}
func isUint(k reflect.Kind) bool {
@ -277,7 +238,3 @@ func isUint(k reflect.Kind) bool {
func isByte(typ reflect.Type) bool {
return typ.Kind() == reflect.Uint8 && !typ.Implements(encoderInterface)
}
func isByteArray(typ reflect.Type) bool {
return (typ.Kind() == reflect.Slice || typ.Kind() == reflect.Array) && isByte(typ.Elem())
}