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accounts/abi: add another unpack interface

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This commit is contained in:
Martin Holst Swende 2017-12-28 11:17:45 +01:00
parent 5603715c06
commit 1ede68355d
No known key found for this signature in database
GPG Key ID: 683B438C05A5DDF0
5 changed files with 395 additions and 14 deletions
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6
accounts/abi/abi.go
View File

@ -136,11 +136,11 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
// MethodById looks up a method by the 4-byte id
// returns nil if none found
func (abi *ABI) MethodById(sigdata []byte) *Method {
func (abi *ABI) MethodById(sigdata []byte) (*Method, error){
for _, method := range abi.Methods {
if bytes.Equal(method.Id(), sigdata[:4]) {
return &method
return &method, nil
}
}
return nil
return nil, fmt.Errorf("ABI spec does not contain method signature in data: 0x%x", sigdata[:4])
}

6
accounts/abi/abi_test.go
View File

@ -689,7 +689,11 @@ func TestABI_MethodById(t *testing.T) {
}
for name, m := range abi.Methods {
a := fmt.Sprintf("%v", m)
b := fmt.Sprintf("%v", abi.MethodById(m.Id()))
m2,err := abi.MethodById(m.Id())
if err != nil {
t.Fatal(err)
}
b := fmt.Sprintf("%v", m2)
if a != b {
t.Errorf("Method %v (id %v) not 'findable' by id in ABI", name, common.ToHex(m.Id()))
}

59
accounts/abi/argument.go
View File

@ -67,6 +67,16 @@ func (arguments Arguments) LengthNonIndexed() int {
return out
}
func (arguments Arguments) NonIndexed() Arguments{
var ret []Argument
for _,arg := range arguments{
if !arg.Indexed{
ret = append(ret, arg)
}
}
return ret
}
// isTuple returns true for non-atomic constructs, like (uint,uint) or uint[]
func (arguments Arguments) isTuple() bool {
return len(arguments) > 1
@ -114,14 +124,9 @@ func (arguments Arguments) unpackTuple(v interface{}, output []byte) error {
// `j` counts the number of complex types.
// both `i` and `j` are used to to correctly compute `data` offset.
i, j := -1, 0
for _, arg := range arguments {
j := 0
for i, arg := range arguments.NonIndexed() {
if arg.Indexed {
// can't read, continue
continue
}
i++
marshalledValue, err := toGoType((i+j)*32, arg.Type, output)
if err != nil {
return err
@ -178,7 +183,6 @@ func (arguments Arguments) unpackAtomic(v interface{}, output []byte) error {
}
value := valueOf.Elem()
marshalledValue, err := toGoType(0, arg.Type, output)
if err != nil {
return err
@ -186,7 +190,44 @@ func (arguments Arguments) unpackAtomic(v interface{}, output []byte) error {
return set(value, reflect.ValueOf(marshalledValue), arg)
}
// Unpack performs the operation Go format -> Hexdata
// UnpackValues can be used to unpack ABI-encoded hexdata according to the ABI-specification,
// without supplying a struct to unpack into. Instead, this method returns a list containing the
// values. An atomic argument will be a list with one element.
func (arguments Arguments) UnpackValues(data []byte) ([]interface{}, error){
retval := make([]interface{},0,arguments.LengthNonIndexed())
virtualArgs := 0
for index,arg:= range arguments.NonIndexed(){
marshalledValue, err := toGoType((index + virtualArgs) * 32, arg.Type, data)
if arg.Type.T == ArrayTy {
//If we have a static array, like [3]uint256, these are coded as
// just like uint256,uint256,uint256.
// This means that we need to add two 'virtual' arguments when
// we count the index from now on
virtualArgs += arg.Type.Size - 1
}
if err != nil{
return nil, err
}
retval = append(retval, marshalledValue)
}
return retval, nil
}
// UnpackValues performs the operation Go format -> Hexdata
// It is the semantic opposite of UnpackValues
func (arguments Arguments) PackValues(args []interface{}) ([]byte, error) {
return arguments.Pack(args...)
}
// Pack performs the operation Go format -> Hexdata
func (arguments Arguments) Pack(args ...interface{}) ([]byte, error) {
// Make sure arguments match up and pack them
abiArgs := arguments

2
accounts/abi/unpack_test.go
View File

@ -130,7 +130,7 @@ var unpackTests = []unpackTest{
{
def: `[{"type": "bytes32"}]`,
enc: "0100000000000000000000000000000000000000000000000000000000000000",
want: common.HexToHash("0100000000000000000000000000000000000000000000000000000000000000"),
want: [32]byte{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
},
{
def: `[{"type": "function"}]`,

336
accounts/abi/unpackv2_test.go Normal file
View File

@ -0,0 +1,336 @@
// Copyright 2015 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 abi
import (
"bytes"
"encoding/hex"
"fmt"
"math/big"
"reflect"
"strconv"
"strings"
"testing"
"github.com/ethereum/go-ethereum/common"
)
func TestUnpackV2(t *testing.T) {
for i, test := range unpackTests {
t.Run(strconv.Itoa(i), func(t *testing.T) {
def := fmt.Sprintf(`[{ "name" : "method", "outputs": %s}]`, test.def)
abi, err := JSON(strings.NewReader(def))
if err != nil {
t.Fatalf("invalid ABI definition %s: %v", def, err)
}
encb, err := hex.DecodeString(test.enc)
if err != nil {
t.Fatalf("invalid hex: %s" + test.enc)
}
out, err := abi.Methods["method"].Outputs.UnpackValues(encb)
if err != nil {
t.Fatal(err)
}
if len(test.err) != 0 {
// The new stuff doesn't have these types of errors
return
}
if !reflect.DeepEqual(test.want, out[0]) {
t.Errorf("test %d (%v) failed: expected %v, got %v", i, test.def, test.want, out[0])
}
})
}
}
func TestMultiReturnWithArrayV2(t *testing.T) {
const definition = `[{"name" : "multi", "outputs": [{"type": "uint64[3]"}, {"type": "uint64"}]}]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
t.Fatal(err)
}
buff := new(bytes.Buffer)
buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000900000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000007"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000006"))
out, err := abi.Methods["multi"].Outputs.UnpackValues(buff.Bytes())
ret1Exp := [3]uint64{9, 8, 7}
ret2Exp := uint64(6)
if !reflect.DeepEqual(out[0], ret1Exp) {
t.Error("array result", out[0], "!= Expected", ret1Exp)
}
if out[1] != ret2Exp {
t.Error("int result", out[1], "!= Expected", ret2Exp)
}
}
func TestUnmarshalV2(t *testing.T) {
const definition = `[
{ "name" : "int", "constant" : false, "outputs": [ { "type": "uint256" } ] },
{ "name" : "bool", "constant" : false, "outputs": [ { "type": "bool" } ] },
{ "name" : "bytes", "constant" : false, "outputs": [ { "type": "bytes" } ] },
{ "name" : "fixed", "constant" : false, "outputs": [ { "type": "bytes32" } ] },
{ "name" : "multi", "constant" : false, "outputs": [ { "type": "bytes" }, { "type": "bytes" } ] },
{ "name" : "intArraySingle", "constant" : false, "outputs": [ { "type": "uint256[3]" } ] },
{ "name" : "addressSliceSingle", "constant" : false, "outputs": [ { "type": "address[]" } ] },
{ "name" : "addressSliceDouble", "constant" : false, "outputs": [ { "name": "a", "type": "address[]" }, { "name": "b", "type": "address[]" } ] },
{ "name" : "mixedBytes", "constant" : true, "outputs": [ { "name": "a", "type": "bytes" }, { "name": "b", "type": "bytes32" } ] }]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
t.Fatal(err)
}
buff := new(bytes.Buffer)
// marshall mixed bytes (mixedBytes)
p0Exp := common.Hex2Bytes("01020000000000000000")
p1Exp := common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000ddeeff")
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000ddeeff"))
buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000a"))
buff.Write(common.Hex2Bytes("0102000000000000000000000000000000000000000000000000000000000000"))
mixedBytes, err := abi.Methods["mixedBytes"].Outputs.UnpackValues(buff.Bytes())
if err != nil {
t.Error(err)
} else {
p0 := mixedBytes[0].([]byte)
p1 := mixedBytes[1].([32]byte)
if !bytes.Equal(p0, p0Exp) {
t.Errorf("unexpected value unpacked: want %x, got %x", p0Exp, p0)
}
if !bytes.Equal(p1[:], p1Exp) {
t.Errorf("unexpected value unpacked: want %x, got %x", p1Exp, p1)
}
}
// marshal int
integer, err := abi.Methods["int"].Outputs.UnpackValues(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
if err != nil {
t.Error(err)
}
if len(integer) == 0 {
t.Error("Expected one integer")
}
intval := integer[0].(*big.Int)
if intval == nil || intval.Cmp(big.NewInt(1)) != 0 {
t.Error("expected Int to be 1 got", intval)
}
// marshal bool
boolreturns, err := abi.Methods["bool"].Outputs.UnpackValues(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
if err != nil {
t.Error(err)
}
boolval := boolreturns[0].(bool)
if !boolval {
t.Error("expected Bool to be true")
}
// marshal dynamic bytes max length 32
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
bytesOut := common.RightPadBytes([]byte("hello"), 32)
buff.Write(bytesOut)
bytesreturns, err := abi.Methods["bytes"].Outputs.UnpackValues(buff.Bytes())
if err != nil {
t.Error(err)
}
bytesval := bytesreturns[0].([]byte)
if !bytes.Equal(bytesval, bytesOut) {
t.Errorf("expected %x got %x", bytesOut, bytesval)
}
// marshall dynamic bytes max length 64
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
bytesOut = common.RightPadBytes([]byte("hello"), 64)
buff.Write(bytesOut)
bytesreturns, err = abi.Methods["bytes"].Outputs.UnpackValues(buff.Bytes())
if err != nil {
t.Error(err)
}
bytesval = bytesreturns[0].([]byte)
if !bytes.Equal(bytesval, bytesOut) {
t.Errorf("expected %x got %x", bytesOut, bytesval)
}
// marshall dynamic bytes max length 64
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000003f"))
bytesOut = common.RightPadBytes([]byte("hello"), 64)
buff.Write(bytesOut)
bytesreturns, err = abi.Methods["bytes"].Outputs.UnpackValues(buff.Bytes())
if err != nil {
t.Error(err)
}
bytesval = bytesreturns[0].([]byte)
if !bytes.Equal(bytesval, bytesOut[:len(bytesOut)-1]) {
t.Errorf("expected %x got %x", bytesOut[:len(bytesOut)-1], bytesval)
}
// marshal dynamic bytes output empty (nil)
bytesreturns, err = abi.Methods["bytes"].Outputs.UnpackValues(nil)
if err == nil {
t.Error("expected error")
}
// marshal dynamic bytes output empty
buff.Reset()
bytesreturns, err = abi.Methods["bytes"].Outputs.UnpackValues(buff.Bytes())
if err == nil {
t.Error("expected error")
}
// marshal dynamic bytes length 5
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
buff.Write(common.RightPadBytes([]byte("hello"), 32))
bytesreturns, err = abi.Methods["bytes"].Outputs.UnpackValues(buff.Bytes())
if err != nil {
t.Error(err)
}
bytesval = bytesreturns[0].([]byte)
if !bytes.Equal(bytesval, []byte("hello")) {
t.Errorf("expected %x got %x", bytesOut, bytesval)
}
// marshal dynamic bytes length 5
buff.Reset()
buff.Write(common.RightPadBytes([]byte("hello"), 32))
hashreturns, err := abi.Methods["fixed"].Outputs.UnpackValues(buff.Bytes())
if err != nil {
t.Error(err)
}
hashval := hashreturns[0].([32]byte)
helloHash := common.BytesToHash(common.RightPadBytes([]byte("hello"), 32))
if common.Hash(hashval) != helloHash {
t.Errorf("Expected %x to equal %x", hashval, helloHash)
}
// marshal error
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
bytesreturns, err = abi.Methods["bytes"].Outputs.UnpackValues(buff.Bytes())
if err == nil {
// Error abi: cannot marshal in to go slice: offset 32 would go over slice boundary (len=64)
t.Error("expected error")
}
bytesreturns, err = abi.Methods["multi"].Outputs.UnpackValues(make([]byte, 64))
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000003"))
// marshal int array
intArrayReturns, err := abi.Methods["intArraySingle"].Outputs.UnpackValues(buff.Bytes())
if err != nil {
t.Error(err)
}
intArray := intArrayReturns[0].([3]*big.Int)
var testAgainstIntArray = [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)}
for i, intval := range intArray {
if intval.Cmp(testAgainstIntArray[i]) != 0 {
t.Errorf("expected %v, got %v", testAgainstIntArray[i], intval)
}
}
// marshal address slice
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) // offset
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // size
buff.Write(common.Hex2Bytes("0000000000000000000000000100000000000000000000000000000000000000"))
outAddrReturns, err := abi.Methods["addressSliceSingle"].Outputs.UnpackValues(buff.Bytes())
if err != nil {
t.Fatal("didn't expect error:", err)
}
outAddr := outAddrReturns[0].([]common.Address)
if len(outAddr) != 1 {
t.Fatal("expected 1 item, got", len(outAddr))
}
if outAddr[0] != (common.Address{1}) {
t.Errorf("expected %x, got %x", common.Address{1}, outAddr[0])
}
// marshal multiple address slice
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040")) // offset
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000080")) // offset
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // size
buff.Write(common.Hex2Bytes("0000000000000000000000000100000000000000000000000000000000000000"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // size
buff.Write(common.Hex2Bytes("0000000000000000000000000200000000000000000000000000000000000000"))
buff.Write(common.Hex2Bytes("0000000000000000000000000300000000000000000000000000000000000000"))
outAddrStructReturns, err := abi.Methods["addressSliceDouble"].Outputs.UnpackValues(buff.Bytes())
if err != nil {
t.Fatal("didn't expect error:", err)
}
A := outAddrStructReturns[0].([]common.Address)
B := outAddrStructReturns[1].([]common.Address)
if len(A) != 1 {
t.Fatal("expected 1 item, got", len(A))
}
if A[0] != (common.Address{1}) {
t.Errorf("expected %x, got %x", common.Address{1}, A[0])
}
if len(B) != 2 {
t.Fatal("expected 1 item, got", len(B))
}
if B[0] != (common.Address{2}) {
t.Errorf("expected %x, got %x", common.Address{2}, B[0])
}
if B[1] != (common.Address{3}) {
t.Errorf("expected %x, got %x", common.Address{3}, B[1])
}
// marshal invalid address slice
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000100"))
err = abi.Unpack(&outAddr, "addressSliceSingle", buff.Bytes())
_, err = abi.Methods["addressSliceSingle"].Outputs.UnpackValues(buff.Bytes())
if err == nil {
t.Fatal("expected error:", err)
}
}