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accounts/abi: Fixed bytes input accept []byte and variable input support

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Fixed up `[]byte` slice support such that `function print(bytes input)`
accepts `[]byte` as input and treats it as 1 element rather than a slice
of multiple elements.

Added support for variable length input parameters like `bytes` and
`strings`.
This commit is contained in:
Jeffrey Wilcke 2016-03-15 14:06:12 +01:00
parent e189fb839c
commit fe45210c55
4 changed files with 193 additions and 31 deletions
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23
accounts/abi/abi.go
View File

@ -56,17 +56,36 @@ func JSON(reader io.Reader) (ABI, error) {
func (abi ABI) pack(name string, args ...interface{}) ([]byte, error) {
method := abi.Methods[name]
// variable input is the output appended at the end of packed
// output. This is used for strings and bytes types input.
var variableInput []byte
var ret []byte
for i, a := range args {
input := method.Inputs[i]
// pack the input
packed, err := input.Type.pack(a)
if err != nil {
return nil, fmt.Errorf("`%s` %v", name, err)
}
ret = append(ret, packed...)
// check for a string or bytes input type
switch input.Type.T {
case StringTy, BytesTy:
// calculate the offset
offset := len(method.Inputs)*32 + len(variableInput)
// set the offset
ret = append(ret, packNum(reflect.ValueOf(offset), UintTy)...)
// Append the packed output to the variable input. The variable input
// will be appended at the end of the input.
variableInput = append(variableInput, packed...)
default:
// append the packed value to the input
ret = append(ret, packed...)
}
}
// append the variable input at the end of the packed input
ret = append(ret, variableInput...)
return ret, nil
}

128
accounts/abi/abi_test.go
View File

@ -365,6 +365,134 @@ func ExampleJSON() {
// 1f2c40920000000000000000000000000000000000000000000000000000000000000001
}
func TestInputVariableInputLength(t *testing.T) {
const definition = `[
{ "type" : "function", "name" : "strOne", "const" : true, "inputs" : [ { "name" : "str", "type" : "string" } ] },
{ "type" : "function", "name" : "bytesOne", "const" : true, "inputs" : [ { "name" : "str", "type" : "bytes" } ] },
{ "type" : "function", "name" : "strTwo", "const" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "str1", "type" : "string" } ] }
]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
t.Fatal(err)
}
// test one string
strin := "hello world"
strpack, err := abi.Pack("strOne", strin)
if err != nil {
t.Error(err)
}
offset := make([]byte, 32)
offset[31] = 32
length := make([]byte, 32)
length[31] = byte(len(strin))
value := common.RightPadBytes([]byte(strin), 32)
exp := append(offset, append(length, value...)...)
// ignore first 4 bytes of the output. This is the function identifier
strpack = strpack[4:]
if !bytes.Equal(strpack, exp) {
t.Errorf("expected %x, got %x\n", exp, strpack)
}
// test one bytes
btspack, err := abi.Pack("bytesOne", []byte(strin))
if err != nil {
t.Error(err)
}
// ignore first 4 bytes of the output. This is the function identifier
btspack = btspack[4:]
if !bytes.Equal(btspack, exp) {
t.Errorf("expected %x, got %x\n", exp, btspack)
}
// test two strings
str1 := "hello"
str2 := "world"
str2pack, err := abi.Pack("strTwo", str1, str2)
if err != nil {
t.Error(err)
}
offset1 := make([]byte, 32)
offset1[31] = 64
length1 := make([]byte, 32)
length1[31] = byte(len(str1))
value1 := common.RightPadBytes([]byte(str1), 32)
offset2 := make([]byte, 32)
offset2[31] = 128
length2 := make([]byte, 32)
length2[31] = byte(len(str2))
value2 := common.RightPadBytes([]byte(str2), 32)
exp2 := append(offset1, offset2...)
exp2 = append(exp2, append(length1, value1...)...)
exp2 = append(exp2, append(length2, value2...)...)
// ignore first 4 bytes of the output. This is the function identifier
str2pack = str2pack[4:]
if !bytes.Equal(str2pack, exp2) {
t.Errorf("expected %x, got %x\n", exp, str2pack)
}
// test two strings, first > 32, second < 32
str1 = strings.Repeat("a", 33)
str2pack, err = abi.Pack("strTwo", str1, str2)
if err != nil {
t.Error(err)
}
offset1 = make([]byte, 32)
offset1[31] = 64
length1 = make([]byte, 32)
length1[31] = byte(len(str1))
value1 = common.RightPadBytes([]byte(str1), 64)
offset2[31] = 160
exp2 = append(offset1, offset2...)
exp2 = append(exp2, append(length1, value1...)...)
exp2 = append(exp2, append(length2, value2...)...)
// ignore first 4 bytes of the output. This is the function identifier
str2pack = str2pack[4:]
if !bytes.Equal(str2pack, exp2) {
t.Errorf("expected %x, got %x\n", exp, str2pack)
}
// test two strings, first > 32, second >32
str1 = strings.Repeat("a", 33)
str2 = strings.Repeat("a", 33)
str2pack, err = abi.Pack("strTwo", str1, str2)
if err != nil {
t.Error(err)
}
offset1 = make([]byte, 32)
offset1[31] = 64
length1 = make([]byte, 32)
length1[31] = byte(len(str1))
value1 = common.RightPadBytes([]byte(str1), 64)
offset2 = make([]byte, 32)
offset2[31] = 160
length2 = make([]byte, 32)
length2[31] = byte(len(str2))
value2 = common.RightPadBytes([]byte(str2), 64)
exp2 = append(offset1, offset2...)
exp2 = append(exp2, append(length1, value1...)...)
exp2 = append(exp2, append(length2, value2...)...)
// ignore first 4 bytes of the output. This is the function identifier
str2pack = str2pack[4:]
if !bytes.Equal(str2pack, exp2) {
t.Errorf("expected %x, got %x\n", exp, str2pack)
}
}
func TestBytes(t *testing.T) {
const definition = `[
{ "type" : "function", "name" : "balance", "const" : true, "inputs" : [ { "name" : "address", "type" : "bytes20" } ] },

58
accounts/abi/numbers.go
View File

@ -23,36 +23,38 @@ import (
"github.com/ethereum/go-ethereum/common"
)
var big_t = reflect.TypeOf(&big.Int{})
var ubig_t = reflect.TypeOf(&big.Int{})
var byte_t = reflect.TypeOf(byte(0))
var byte_ts = reflect.TypeOf([]byte(nil))
var uint_t = reflect.TypeOf(uint(0))
var uint8_t = reflect.TypeOf(uint8(0))
var uint16_t = reflect.TypeOf(uint16(0))
var uint32_t = reflect.TypeOf(uint32(0))
var uint64_t = reflect.TypeOf(uint64(0))
var int_t = reflect.TypeOf(int(0))
var int8_t = reflect.TypeOf(int8(0))
var int16_t = reflect.TypeOf(int16(0))
var int32_t = reflect.TypeOf(int32(0))
var int64_t = reflect.TypeOf(int64(0))
var hash_t = reflect.TypeOf(common.Hash{})
var address_t = reflect.TypeOf(common.Address{})
var (
big_t = reflect.TypeOf(&big.Int{})
ubig_t = reflect.TypeOf(&big.Int{})
byte_t = reflect.TypeOf(byte(0))
byte_ts = reflect.TypeOf([]byte(nil))
uint_t = reflect.TypeOf(uint(0))
uint8_t = reflect.TypeOf(uint8(0))
uint16_t = reflect.TypeOf(uint16(0))
uint32_t = reflect.TypeOf(uint32(0))
uint64_t = reflect.TypeOf(uint64(0))
int_t = reflect.TypeOf(int(0))
int8_t = reflect.TypeOf(int8(0))
int16_t = reflect.TypeOf(int16(0))
int32_t = reflect.TypeOf(int32(0))
int64_t = reflect.TypeOf(int64(0))
hash_t = reflect.TypeOf(common.Hash{})
address_t = reflect.TypeOf(common.Address{})
var uint_ts = reflect.TypeOf([]uint(nil))
var uint8_ts = reflect.TypeOf([]uint8(nil))
var uint16_ts = reflect.TypeOf([]uint16(nil))
var uint32_ts = reflect.TypeOf([]uint32(nil))
var uint64_ts = reflect.TypeOf([]uint64(nil))
var ubig_ts = reflect.TypeOf([]*big.Int(nil))
uint_ts = reflect.TypeOf([]uint(nil))
uint8_ts = reflect.TypeOf([]uint8(nil))
uint16_ts = reflect.TypeOf([]uint16(nil))
uint32_ts = reflect.TypeOf([]uint32(nil))
uint64_ts = reflect.TypeOf([]uint64(nil))
ubig_ts = reflect.TypeOf([]*big.Int(nil))
var int_ts = reflect.TypeOf([]int(nil))
var int8_ts = reflect.TypeOf([]int8(nil))
var int16_ts = reflect.TypeOf([]int16(nil))
var int32_ts = reflect.TypeOf([]int32(nil))
var int64_ts = reflect.TypeOf([]int64(nil))
var big_ts = reflect.TypeOf([]*big.Int(nil))
int_ts = reflect.TypeOf([]int(nil))
int8_ts = reflect.TypeOf([]int8(nil))
int16_ts = reflect.TypeOf([]int16(nil))
int32_ts = reflect.TypeOf([]int32(nil))
int64_ts = reflect.TypeOf([]int64(nil))
big_ts = reflect.TypeOf([]*big.Int(nil))
)
// U256 will ensure unsigned 256bit on big nums
func U256(n *big.Int) []byte {

15
accounts/abi/type.go
View File

@ -163,6 +163,13 @@ func (t Type) String() (out string) {
return t.stringKind
}
// packBytesSlice packs the given bytes as [L, V] as the canonical representation
// bytes slice
func packBytesSlice(bytes []byte, l int) []byte {
len := packNum(reflect.ValueOf(l), UintTy)
return append(len, common.RightPadBytes(bytes, (l+31)/32*32)...)
}
// Test the given input parameter `v` and checks if it matches certain
// criteria
// * Big integers are checks for ptr types and if the given value is
@ -193,8 +200,14 @@ func (t Type) pack(v interface{}) ([]byte, error) {
if t.Size > -1 && value.Len() > t.Size {
return nil, fmt.Errorf("%v out of bound. %d for %d", value.Kind(), value.Len(), t.Size)
}
return []byte(common.LeftPadString(t.String(), 32)), nil
return packBytesSlice([]byte(value.String()), value.Len()), nil
case reflect.Slice:
// if the param is a bytes type, pack the slice up as a string
if t.T == BytesTy {
return packBytesSlice(value.Bytes(), value.Len()), nil
}
if t.Size > -1 && value.Len() > t.Size {
return nil, fmt.Errorf("%v out of bound. %d for %d", value.Kind(), value.Len(), t.Size)
}