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Merge pull request #2435 from obscuren/abi-array-fixes

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accounts/abi: refactored ABI package
pull/2504/head
Péter Szilágyi 9 years ago
parent 1b77d5090d 4880868c88
commit 0f722df2d9
8 changed files with 733 additions and 362 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 90
      accounts/abi/abi.go
  2. 567
      accounts/abi/abi_test.go
  3. 79
      accounts/abi/error.go
  4. 39
      accounts/abi/method.go
  5. 4
      accounts/abi/numbers.go
  6. 65
      accounts/abi/packing.go
  7. 64
      accounts/abi/reflect.go
  8. 187
      accounts/abi/type.go

90
accounts/abi/abi.go
Unescape View File

@ -48,42 +48,6 @@ func JSON(reader io.Reader) (ABI, error) {
return abi, nil
}
// tests, tests whether the given input would result in a successful
// call. Checks argument list count and matches input to `input`.
func (abi ABI) pack(method Method, args ...interface{}) ([]byte, error) {
// 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", method.Name, err)
}
// check for a slice type (string, bytes, slice)
if input.Type.T == StringTy || input.Type.T == BytesTy || input.Type.IsSlice {
// 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...)
} else {
// 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
}
// Pack the given method name to conform the ABI. Method call's data
// will consist of method_id, args0, arg1, ... argN. Method id consists
// of 4 bytes and arguments are all 32 bytes.
@ -102,11 +66,7 @@ func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
}
method = m
}
// Make sure arguments match up and pack them
if len(args) != len(method.Inputs) {
return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(method.Inputs))
}
arguments, err := abi.pack(method, args...)
arguments, err := method.pack(method, args...)
if err != nil {
return nil, err
}
@ -126,18 +86,21 @@ func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
if index+32 > len(output) {
return nil, fmt.Errorf("abi: cannot marshal in to go slice: insufficient size output %d require %d", len(output), index+32)
}
elem := t.Type.Elem
// first we need to create a slice of the type
var refSlice reflect.Value
switch t.Type.T {
switch elem.T {
case IntTy, UintTy, BoolTy: // int, uint, bool can all be of type big int.
refSlice = reflect.ValueOf([]*big.Int(nil))
case AddressTy: // address must be of slice Address
refSlice = reflect.ValueOf([]common.Address(nil))
case HashTy: // hash must be of slice hash
refSlice = reflect.ValueOf([]common.Hash(nil))
case FixedBytesTy:
refSlice = reflect.ValueOf([]byte(nil))
default: // no other types are supported
return nil, fmt.Errorf("abi: unsupported slice type %v", t.Type.T)
return nil, fmt.Errorf("abi: unsupported slice type %v", elem.T)
}
// get the offset which determines the start of this array ...
offset := int(common.BytesToBig(output[index : index+32]).Uint64())
@ -164,7 +127,7 @@ func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
)
// set inter to the correct type (cast)
switch t.Type.T {
switch elem.T {
case IntTy, UintTy:
inter = common.BytesToBig(returnOutput)
case BoolTy:
@ -186,7 +149,7 @@ func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
// argument in T.
func toGoType(i int, t Argument, output []byte) (interface{}, error) {
// we need to treat slices differently
if t.Type.IsSlice {
if (t.Type.IsSlice || t.Type.IsArray) && t.Type.T != BytesTy && t.Type.T != StringTy && t.Type.T != FixedBytesTy {
return toGoSlice(i, t, output)
}
@ -217,12 +180,33 @@ func toGoType(i int, t Argument, output []byte) (interface{}, error) {
returnOutput = output[index : index+32]
}
// cast bytes to abi return type
// convert the bytes to whatever is specified by the ABI.
switch t.Type.T {
case IntTy:
return common.BytesToBig(returnOutput), nil
case UintTy:
return common.BytesToBig(returnOutput), nil
case IntTy, UintTy:
bigNum := common.BytesToBig(returnOutput)
// If the type is a integer convert to the integer type
// specified by the ABI.
switch t.Type.Kind {
case reflect.Uint8:
return uint8(bigNum.Uint64()), nil
case reflect.Uint16:
return uint16(bigNum.Uint64()), nil
case reflect.Uint32:
return uint32(bigNum.Uint64()), nil
case reflect.Uint64:
return uint64(bigNum.Uint64()), nil
case reflect.Int8:
return int8(bigNum.Int64()), nil
case reflect.Int16:
return int16(bigNum.Int64()), nil
case reflect.Int32:
return int32(bigNum.Int64()), nil
case reflect.Int64:
return int64(bigNum.Int64()), nil
case reflect.Ptr:
return bigNum, nil
}
case BoolTy:
return common.BytesToBig(returnOutput).Uint64() > 0, nil
case AddressTy:
@ -328,10 +312,12 @@ func set(dst, src reflect.Value, output Argument) error {
return fmt.Errorf("abi: cannot unmarshal %v in to array of elem %v", src.Type(), dstType.Elem())
}
if dst.Len() < output.Type.Size {
return fmt.Errorf("abi: cannot unmarshal src (len=%d) in to dst (len=%d)", output.Type.Size, dst.Len())
if dst.Len() < output.Type.SliceSize {
return fmt.Errorf("abi: cannot unmarshal src (len=%d) in to dst (len=%d)", output.Type.SliceSize, dst.Len())
}
reflect.Copy(dst, src)
case dstType.Kind() == reflect.Interface:
dst.Set(src)
default:
return fmt.Errorf("abi: cannot unmarshal %v in to %v", src.Type(), dst.Type())
}

567
accounts/abi/abi_test.go
Unescape View File

@ -29,66 +29,391 @@ import (
"github.com/ethereum/go-ethereum/crypto"
)
const jsondata = `
[
{ "type" : "function", "name" : "balance", "const" : true },
{ "type" : "function", "name" : "send", "const" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] }
]`
// formatSilceOutput add padding to the value and adds a size
func formatSliceOutput(v ...[]byte) []byte {
off := common.LeftPadBytes(big.NewInt(int64(len(v))).Bytes(), 32)
output := append(off, make([]byte, 0, len(v)*32)...)
const jsondata2 = `
[
{ "type" : "function", "name" : "balance", "const" : true },
{ "type" : "function", "name" : "send", "const" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] },
{ "type" : "function", "name" : "test", "const" : false, "inputs" : [ { "name" : "number", "type" : "uint32" } ] },
{ "type" : "function", "name" : "string", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "string" } ] },
{ "type" : "function", "name" : "bool", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "bool" } ] },
{ "type" : "function", "name" : "address", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "address" } ] },
{ "type" : "function", "name" : "string32", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "string32" } ] },
{ "type" : "function", "name" : "uint64[2]", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[2]" } ] },
{ "type" : "function", "name" : "uint64[]", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[]" } ] },
{ "type" : "function", "name" : "foo", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" } ] },
{ "type" : "function", "name" : "bar", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" }, { "name" : "string", "type" : "uint16" } ] },
{ "type" : "function", "name" : "slice", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32[2]" } ] },
{ "type" : "function", "name" : "slice256", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint256[2]" } ] },
{ "type" : "function", "name" : "sliceAddress", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "address[]" } ] },
{ "type" : "function", "name" : "sliceMultiAddress", "const" : false, "inputs" : [ { "name" : "a", "type" : "address[]" }, { "name" : "b", "type" : "address[]" } ] }
]`
for _, value := range v {
output = append(output, common.LeftPadBytes(value, 32)...)
}
return output
}
func TestType(t *testing.T) {
typ, err := NewType("uint32")
if err != nil {
t.Error(err)
// quick helper padding
func pad(input []byte, size int, left bool) []byte {
if left {
return common.LeftPadBytes(input, size)
}
if typ.Kind != reflect.Uint {
t.Error("expected uint32 to have kind Ptr")
return common.RightPadBytes(input, size)
}
func TestTypeCheck(t *testing.T) {
for i, test := range []struct {
typ string
input interface{}
err string
}{
{"uint", big.NewInt(1), ""},
{"int", big.NewInt(1), ""},
{"uint30", big.NewInt(1), ""},
{"uint30", uint8(1), "abi: cannot use uint8 as type ptr as argument"},
{"uint16", uint16(1), ""},
{"uint16", uint8(1), "abi: cannot use uint8 as type uint16 as argument"},
{"uint16[]", []uint16{1, 2, 3}, ""},
{"uint16[]", [3]uint16{1, 2, 3}, ""},
{"uint16[]", []uint32{1, 2, 3}, "abi: cannot use []uint32 as type []uint16 as argument"},
{"uint16[3]", [3]uint32{1, 2, 3}, "abi: cannot use [3]uint32 as type [3]uint16 as argument"},
{"uint16[3]", [4]uint16{1, 2, 3}, "abi: cannot use [4]uint16 as type [3]uint16 as argument"},
{"uint16[3]", []uint16{1, 2, 3}, ""},
{"uint16[3]", []uint16{1, 2, 3, 4}, "abi: cannot use [4]uint16 as type [3]uint16 as argument"},
{"address[]", []common.Address{common.Address{1}}, ""},
{"address[1]", []common.Address{common.Address{1}}, ""},
{"address[1]", [1]common.Address{common.Address{1}}, ""},
{"address[2]", [1]common.Address{common.Address{1}}, "abi: cannot use [1]array as type [2]array as argument"},
{"bytes32", [32]byte{}, ""},
{"bytes32", [33]byte{}, "abi: cannot use [33]uint8 as type [32]uint8 as argument"},
{"bytes32", common.Hash{1}, ""},
{"bytes31", [31]byte{}, ""},
{"bytes31", [32]byte{}, "abi: cannot use [32]uint8 as type [31]uint8 as argument"},
{"bytes", []byte{0, 1}, ""},
{"bytes", [2]byte{0, 1}, ""},
{"bytes", common.Hash{1}, ""},
{"string", "hello world", ""},
{"bytes32[]", [][32]byte{[32]byte{}}, ""},
} {
typ, err := NewType(test.typ)
if err != nil {
t.Fatal("unexpected parse error:", err)
}
err = typeCheck(typ, reflect.ValueOf(test.input))
if err != nil && len(test.err) == 0 {
t.Errorf("%d failed. Expected no err but got: %v", i, err)
continue
}
if err == nil && len(test.err) != 0 {
t.Errorf("%d failed. Expected err: %v but got none", i, test.err)
continue
}
if err != nil && len(test.err) != 0 && err.Error() != test.err {
t.Errorf("%d failed. Expected err: '%v' got err: '%v'", i, test.err, err)
}
}
}
typ, err = NewType("uint32[]")
func TestSimpleMethodUnpack(t *testing.T) {
for i, test := range []struct {
def string // definition of the **output** ABI params
marshalledOutput []byte // evm return data
expectedOut interface{} // the expected output
outVar string // the output variable (e.g. uint32, *big.Int, etc)
err string // empty or error if expected
}{
{
`[ { "type": "uint32" } ]`,
pad([]byte{1}, 32, true),
uint32(1),
"uint32",
"",
},
{
`[ { "type": "uint32" } ]`,
pad([]byte{1}, 32, true),
nil,
"uint16",
"abi: cannot unmarshal uint32 in to uint16",
},
{
`[ { "type": "uint17" } ]`,
pad([]byte{1}, 32, true),
nil,
"uint16",
"abi: cannot unmarshal *big.Int in to uint16",
},
{
`[ { "type": "uint17" } ]`,
pad([]byte{1}, 32, true),
big.NewInt(1),
"*big.Int",
"",
},
{
`[ { "type": "int32" } ]`,
pad([]byte{1}, 32, true),
int32(1),
"int32",
"",
},
{
`[ { "type": "int32" } ]`,
pad([]byte{1}, 32, true),
nil,
"int16",
"abi: cannot unmarshal int32 in to int16",
},
{
`[ { "type": "int17" } ]`,
pad([]byte{1}, 32, true),
nil,
"int16",
"abi: cannot unmarshal *big.Int in to int16",
},
{
`[ { "type": "int17" } ]`,
pad([]byte{1}, 32, true),
big.NewInt(1),
"*big.Int",
"",
},
{
`[ { "type": "address" } ]`,
pad(pad([]byte{1}, 20, false), 32, true),
common.Address{1},
"address",
"",
},
{
`[ { "type": "bytes32" } ]`,
pad([]byte{1}, 32, false),
pad([]byte{1}, 32, false),
"bytes",
"",
},
{
`[ { "type": "bytes32" } ]`,
pad([]byte{1}, 32, false),
pad([]byte{1}, 32, false),
"hash",
"",
},
{
`[ { "type": "bytes32" } ]`,
pad([]byte{1}, 32, false),
pad([]byte{1}, 32, false),
"interface",
"",
},
} {
abiDefinition := fmt.Sprintf(`[{ "name" : "method", "outputs": %s}]`, test.def)
abi, err := JSON(strings.NewReader(abiDefinition))
if err != nil {
t.Errorf("%d failed. %v", i, err)
continue
}
var outvar interface{}
switch test.outVar {
case "uint8":
var v uint8
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "uint16":
var v uint16
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "uint32":
var v uint32
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "uint64":
var v uint64
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "int8":
var v int8
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "int16":
var v int16
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "int32":
var v int32
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "int64":
var v int64
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "*big.Int":
var v *big.Int
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "address":
var v common.Address
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "bytes":
var v []byte
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "hash":
var v common.Hash
err = abi.Unpack(&v, "method", test.marshalledOutput)
outvar = v
case "interface":
err = abi.Unpack(&outvar, "method", test.marshalledOutput)
default:
t.Errorf("unsupported type '%v' please add it to the switch statement in this test", test.outVar)
continue
}
if err != nil && len(test.err) == 0 {
t.Errorf("%d failed. Expected no err but got: %v", i, err)
continue
}
if err == nil && len(test.err) != 0 {
t.Errorf("%d failed. Expected err: %v but got none", i, test.err)
continue
}
if err != nil && len(test.err) != 0 && err.Error() != test.err {
t.Errorf("%d failed. Expected err: '%v' got err: '%v'", i, test.err, err)
continue
}
if err == nil {
// bit of an ugly hack for hash type but I don't feel like finding a proper solution
if test.outVar == "hash" {
tmp := outvar.(common.Hash) // without assignment it's unaddressable
outvar = tmp[:]
}
if !reflect.DeepEqual(test.expectedOut, outvar) {
t.Errorf("%d failed. Output error: expected %v, got %v", i, test.expectedOut, outvar)
}
}
}
}
func TestPack(t *testing.T) {
for i, test := range []struct {
typ string
input interface{}
output []byte
}{
{"uint16", uint16(2), pad([]byte{2}, 32, true)},
{"uint16[]", []uint16{1, 2}, formatSliceOutput([]byte{1}, []byte{2})},
{"bytes20", [20]byte{1}, pad([]byte{1}, 32, false)},
{"uint256[]", []*big.Int{big.NewInt(1), big.NewInt(2)}, formatSliceOutput([]byte{1}, []byte{2})},
{"address[]", []common.Address{common.Address{1}, common.Address{2}}, formatSliceOutput(pad([]byte{1}, 20, false), pad([]byte{2}, 20, false))},
{"bytes32[]", []common.Hash{common.Hash{1}, common.Hash{2}}, formatSliceOutput(pad([]byte{1}, 32, false), pad([]byte{2}, 32, false))},
} {
typ, err := NewType(test.typ)
if err != nil {
t.Fatal("unexpected parse error:", err)
}
output, err := typ.pack(reflect.ValueOf(test.input))
if err != nil {
t.Fatal("unexpected pack error:", err)
}
if !bytes.Equal(output, test.output) {
t.Errorf("%d failed. Expected bytes: '%x' Got: '%x'", i, test.output, output)
}
}
}
func TestMethodPack(t *testing.T) {
abi, err := JSON(strings.NewReader(jsondata2))
if err != nil {
t.Fatal(err)
}
sig := abi.Methods["slice"].Id()
sig = append(sig, common.LeftPadBytes([]byte{32}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
packed, err := abi.Pack("slice", []uint32{1, 2})
if err != nil {
t.Error(err)
}
if !typ.IsSlice {
t.Error("expected uint32[] to be slice")
if !bytes.Equal(packed, sig) {
t.Errorf("expected %x got %x", sig, packed)
}
if typ.Type != ubig_t {
t.Error("expcted uith32[] to have type uint64")
var addrA, addrB = common.Address{1}, common.Address{2}
sig = abi.Methods["sliceAddress"].Id()
sig = append(sig, common.LeftPadBytes([]byte{32}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes(addrA[:], 32)...)
sig = append(sig, common.LeftPadBytes(addrB[:], 32)...)
packed, err = abi.Pack("sliceAddress", []common.Address{addrA, addrB})
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(packed, sig) {
t.Errorf("expected %x got %x", sig, packed)
}
typ, err = NewType("uint32[2]")
var addrC, addrD = common.Address{3}, common.Address{4}
sig = abi.Methods["sliceMultiAddress"].Id()
sig = append(sig, common.LeftPadBytes([]byte{64}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{160}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes(addrA[:], 32)...)
sig = append(sig, common.LeftPadBytes(addrB[:], 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes(addrC[:], 32)...)
sig = append(sig, common.LeftPadBytes(addrD[:], 32)...)
packed, err = abi.Pack("sliceMultiAddress", []common.Address{addrA, addrB}, []common.Address{addrC, addrD})
if err != nil {
t.Error(err)
t.Fatal(err)
}
if !typ.IsSlice {
t.Error("expected uint32[2] to be slice")
if !bytes.Equal(packed, sig) {
t.Errorf("expected %x got %x", sig, packed)
}
if typ.Type != ubig_t {
t.Error("expcted uith32[2] to have type uint64")
sig = abi.Methods["slice256"].Id()
sig = append(sig, common.LeftPadBytes([]byte{32}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
packed, err = abi.Pack("slice256", []*big.Int{big.NewInt(1), big.NewInt(2)})
if err != nil {
t.Error(err)
}
if typ.SliceSize != 2 {
t.Error("expected uint32[2] to have a size of 2")
if !bytes.Equal(packed, sig) {
t.Errorf("expected %x got %x", sig, packed)
}
}
const jsondata = `
[
{ "type" : "function", "name" : "balance", "constant" : true },
{ "type" : "function", "name" : "send", "constant" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] }
]`
const jsondata2 = `
[
{ "type" : "function", "name" : "balance", "constant" : true },
{ "type" : "function", "name" : "send", "constant" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] },
{ "type" : "function", "name" : "test", "constant" : false, "inputs" : [ { "name" : "number", "type" : "uint32" } ] },
{ "type" : "function", "name" : "string", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "string" } ] },
{ "type" : "function", "name" : "bool", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "bool" } ] },
{ "type" : "function", "name" : "address", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "address" } ] },
{ "type" : "function", "name" : "uint64[2]", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[2]" } ] },
{ "type" : "function", "name" : "uint64[]", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[]" } ] },
{ "type" : "function", "name" : "foo", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" } ] },
{ "type" : "function", "name" : "bar", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" }, { "name" : "string", "type" : "uint16" } ] },
{ "type" : "function", "name" : "slice", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32[2]" } ] },
{ "type" : "function", "name" : "slice256", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint256[2]" } ] },
{ "type" : "function", "name" : "sliceAddress", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "address[]" } ] },
{ "type" : "function", "name" : "sliceMultiAddress", "constant" : false, "inputs" : [ { "name" : "a", "type" : "address[]" }, { "name" : "b", "type" : "address[]" } ] }
]`
func TestReader(t *testing.T) {
Uint256, _ := NewType("uint256")
exp := ABI{
@ -164,21 +489,6 @@ func TestTestString(t *testing.T) {
if _, err := abi.Pack("string", "hello world"); err != nil {
t.Error(err)
}
str10 := string(make([]byte, 10))
if _, err := abi.Pack("string32", str10); err != nil {
t.Error(err)
}
str32 := string(make([]byte, 32))
if _, err := abi.Pack("string32", str32); err != nil {
t.Error(err)
}
str33 := string(make([]byte, 33))
if _, err := abi.Pack("string32", str33); err == nil {
t.Error("expected str33 to throw out of bound error")
}
}
func TestTestBool(t *testing.T) {
@ -210,26 +520,10 @@ func TestTestSlice(t *testing.T) {
}
}
func TestImplicitTypeCasts(t *testing.T) {
abi, err := JSON(strings.NewReader(jsondata2))
if err != nil {
t.Error(err)
t.FailNow()
}
slice := make([]uint8, 2)
_, err = abi.Pack("uint64[2]", slice)
expStr := "`uint64[2]` abi: cannot use type uint8 as type uint64"
if err.Error() != expStr {
t.Errorf("expected %v, got %v", expStr, err)
}
}
func TestMethodSignature(t *testing.T) {
String, _ := NewType("string")
String32, _ := NewType("string32")
m := Method{"foo", false, []Argument{Argument{"bar", String32, false}, Argument{"baz", String, false}}, nil}
exp := "foo(string32,string)"
m := Method{"foo", false, []Argument{Argument{"bar", String, false}, Argument{"baz", String, false}}, nil}
exp := "foo(string,string)"
if m.Sig() != exp {
t.Error("signature mismatch", exp, "!=", m.Sig())
}
@ -247,28 +541,6 @@ func TestMethodSignature(t *testing.T) {
}
}
func TestPack(t *testing.T) {
abi, err := JSON(strings.NewReader(jsondata2))
if err != nil {
t.Error(err)
t.FailNow()
}
sig := crypto.Keccak256([]byte("foo(uint32)"))[:4]
sig = append(sig, make([]byte, 32)...)
sig[35] = 10
packed, err := abi.Pack("foo", uint32(10))
if err != nil {
t.Error(err)
t.FailNow()
}
if !bytes.Equal(packed, sig) {
t.Errorf("expected %x got %x", sig, packed)
}
}
func TestMultiPack(t *testing.T) {
abi, err := JSON(strings.NewReader(jsondata2))
if err != nil {
@ -292,77 +564,6 @@ func TestMultiPack(t *testing.T) {
}
}
func TestPackSlice(t *testing.T) {
abi, err := JSON(strings.NewReader(jsondata2))
if err != nil {
t.Error(err)
t.FailNow()
}
sig := crypto.Keccak256([]byte("slice(uint32[2])"))[:4]
sig = append(sig, common.LeftPadBytes([]byte{32}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
packed, err := abi.Pack("slice", []uint32{1, 2})
if err != nil {
t.Error(err)
}
if !bytes.Equal(packed, sig) {
t.Errorf("expected %x got %x", sig, packed)
}
var addrA, addrB = common.Address{1}, common.Address{2}
sig = abi.Methods["sliceAddress"].Id()
sig = append(sig, common.LeftPadBytes([]byte{32}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes(addrA[:], 32)...)
sig = append(sig, common.LeftPadBytes(addrB[:], 32)...)
packed, err = abi.Pack("sliceAddress", []common.Address{addrA, addrB})
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(packed, sig) {
t.Errorf("expected %x got %x", sig, packed)
}
var addrC, addrD = common.Address{3}, common.Address{4}
sig = abi.Methods["sliceMultiAddress"].Id()
sig = append(sig, common.LeftPadBytes([]byte{64}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{160}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes(addrA[:], 32)...)
sig = append(sig, common.LeftPadBytes(addrB[:], 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes(addrC[:], 32)...)
sig = append(sig, common.LeftPadBytes(addrD[:], 32)...)
packed, err = abi.Pack("sliceMultiAddress", []common.Address{addrA, addrB}, []common.Address{addrC, addrD})
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(packed, sig) {
t.Errorf("expected %x got %x", sig, packed)
}
sig = crypto.Keccak256([]byte("slice256(uint256[2])"))[:4]
sig = append(sig, common.LeftPadBytes([]byte{32}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
packed, err = abi.Pack("slice256", []*big.Int{big.NewInt(1), big.NewInt(2)})
if err != nil {
t.Error(err)
}
if !bytes.Equal(packed, sig) {
t.Errorf("expected %x got %x", sig, packed)
}
}
func ExampleJSON() {
const definition = `[{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"isBar","outputs":[{"name":"","type":"bool"}],"type":"function"}]`
@ -382,9 +583,9 @@ func ExampleJSON() {
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" } ] }
{ "type" : "function", "name" : "strOne", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" } ] },
{ "type" : "function", "name" : "bytesOne", "constant" : true, "inputs" : [ { "name" : "str", "type" : "bytes" } ] },
{ "type" : "function", "name" : "strTwo", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "str1", "type" : "string" } ] }
]`
abi, err := JSON(strings.NewReader(definition))
@ -546,7 +747,7 @@ func TestBareEvents(t *testing.T) {
func TestMultiReturnWithStruct(t *testing.T) {
const definition = `[
{ "name" : "multi", "const" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
{ "name" : "multi", "constant" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
@ -599,7 +800,7 @@ func TestMultiReturnWithStruct(t *testing.T) {
func TestMultiReturnWithSlice(t *testing.T) {
const definition = `[
{ "name" : "multi", "const" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
{ "name" : "multi", "constant" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
@ -635,8 +836,8 @@ func TestMultiReturnWithSlice(t *testing.T) {
func TestMarshalArrays(t *testing.T) {
const definition = `[
{ "name" : "bytes32", "const" : false, "outputs": [ { "type": "bytes32" } ] },
{ "name" : "bytes10", "const" : false, "outputs": [ { "type": "bytes10" } ] }
{ "name" : "bytes32", "constant" : false, "outputs": [ { "type": "bytes32" } ] },
{ "name" : "bytes10", "constant" : false, "outputs": [ { "type": "bytes10" } ] }
]`
abi, err := JSON(strings.NewReader(definition))
@ -694,14 +895,14 @@ func TestMarshalArrays(t *testing.T) {
func TestUnmarshal(t *testing.T) {
const definition = `[
{ "name" : "int", "const" : false, "outputs": [ { "type": "uint256" } ] },
{ "name" : "bool", "const" : false, "outputs": [ { "type": "bool" } ] },
{ "name" : "bytes", "const" : false, "outputs": [ { "type": "bytes" } ] },
{ "name" : "fixed", "const" : false, "outputs": [ { "type": "bytes32" } ] },
{ "name" : "multi", "const" : false, "outputs": [ { "type": "bytes" }, { "type": "bytes" } ] },
{ "name" : "addressSliceSingle", "const" : false, "outputs": [ { "type": "address[]" } ] },
{ "name" : "addressSliceDouble", "const" : false, "outputs": [ { "name": "a", "type": "address[]" }, { "name": "b", "type": "address[]" } ] },
{ "name" : "mixedBytes", "const" : true, "outputs": [ { "name": "a", "type": "bytes" }, { "name": "b", "type": "bytes32" } ] }]`
{ "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" : "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 {

79
accounts/abi/error.go
Unescape View File

@ -0,0 +1,79 @@
// Copyright 2016 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 (
"fmt"
"reflect"
)
// formatSliceString formats the reflection kind with the given slice size
// and returns a formatted string representation.
func formatSliceString(kind reflect.Kind, sliceSize int) string {
if sliceSize == -1 {
return fmt.Sprintf("[]%v", kind)
}
return fmt.Sprintf("[%d]%v", sliceSize, kind)
}
// sliceTypeCheck checks that the given slice can by assigned to the reflection
// type in t.
func sliceTypeCheck(t Type, val reflect.Value) error {
if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
return typeErr(formatSliceString(t.Kind, t.SliceSize), val.Type())
}
if t.IsArray && val.Len() != t.SliceSize {
return typeErr(formatSliceString(t.Elem.Kind, t.SliceSize), formatSliceString(val.Type().Elem().Kind(), val.Len()))
}
if t.Elem.IsSlice {
if val.Len() > 0 {
return sliceTypeCheck(*t.Elem, val.Index(0))
}
} else if t.Elem.IsArray {
return sliceTypeCheck(*t.Elem, val.Index(0))
}
if elemKind := val.Type().Elem().Kind(); elemKind != t.Elem.Kind {
return typeErr(formatSliceString(t.Elem.Kind, t.SliceSize), val.Type())
}
return nil
}
// typeCheck checks that the given reflection value can be assigned to the reflection
// type in t.
func typeCheck(t Type, value reflect.Value) error {
if t.IsSlice || t.IsArray {
return sliceTypeCheck(t, value)
}
// Check base type validity. Element types will be checked later on.
if t.Kind != value.Kind() {
return typeErr(t.Kind, value.Kind())
}
return nil
}
// varErr returns a formatted error.
func varErr(expected, got reflect.Kind) error {
return typeErr(expected, got)
}
// typeErr returns a formatted type casting error.
func typeErr(expected, got interface{}) error {
return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected)
}

39
accounts/abi/method.go
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@ -18,6 +18,7 @@ package abi
import (
"fmt"
"reflect"
"strings"
"github.com/ethereum/go-ethereum/crypto"
@ -38,6 +39,44 @@ type Method struct {
Outputs []Argument
}
func (m Method) pack(method Method, args ...interface{}) ([]byte, error) {
// Make sure arguments match up and pack them
if len(args) != len(method.Inputs) {
return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(method.Inputs))
}
// 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(reflect.ValueOf(a))
if err != nil {
return nil, fmt.Errorf("`%s` %v", method.Name, err)
}
// check for a slice type (string, bytes, slice)
if input.Type.requiresLengthPrefix() {
// 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...)
} else {
// 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
}
// Sig returns the methods string signature according to the ABI spec.
//
// Example

4
accounts/abi/numbers.go
Unescape View File

@ -24,8 +24,8 @@ import (
)
var (
big_t = reflect.TypeOf(&big.Int{})
ubig_t = reflect.TypeOf(&big.Int{})
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))

65
accounts/abi/packing.go
Unescape View File

@ -0,0 +1,65 @@
// Copyright 2016 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 (
"reflect"
"github.com/ethereum/go-ethereum/common"
)
// 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)...)
}
// packElement packs the given reflect value according to the abi specification in
// t.
func packElement(t Type, reflectValue reflect.Value) []byte {
switch t.T {
case IntTy, UintTy:
return packNum(reflectValue, t.T)
case StringTy:
return packBytesSlice([]byte(reflectValue.String()), reflectValue.Len())
case AddressTy:
if reflectValue.Kind() == reflect.Array {
reflectValue = mustArrayToByteSlice(reflectValue)
}
return common.LeftPadBytes(reflectValue.Bytes(), 32)
case BoolTy:
if reflectValue.Bool() {
return common.LeftPadBytes(common.Big1.Bytes(), 32)
} else {
return common.LeftPadBytes(common.Big0.Bytes(), 32)
}
case BytesTy:
if reflectValue.Kind() == reflect.Array {
reflectValue = mustArrayToByteSlice(reflectValue)
}
return packBytesSlice(reflectValue.Bytes(), reflectValue.Len())
case FixedBytesTy:
if reflectValue.Kind() == reflect.Array {
reflectValue = mustArrayToByteSlice(reflectValue)
}
return common.RightPadBytes(reflectValue.Bytes(), 32)
}
panic("abi: fatal error")
}

64
accounts/abi/reflect.go
Unescape View File

@ -0,0 +1,64 @@
// Copyright 2016 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 "reflect"
// indirect recursively dereferences the value until it either gets the value
// or finds a big.Int
func indirect(v reflect.Value) reflect.Value {
if v.Kind() == reflect.Ptr && v.Elem().Type() != big_t {
return indirect(v.Elem())
}
return v
}
// reflectIntKind returns the reflect using the given size and
// unsignedness.
func reflectIntKind(unsigned bool, size int) reflect.Kind {
switch size {
case 8:
if unsigned {
return reflect.Uint8
}
return reflect.Int8
case 16:
if unsigned {
return reflect.Uint16
}
return reflect.Int16
case 32:
if unsigned {
return reflect.Uint32
}
return reflect.Int32
case 64:
if unsigned {
return reflect.Uint64
}
return reflect.Int64
}
return reflect.Ptr
}
// mustArrayToBytesSlice creates a new byte slice with the exact same size as value
// and copies the bytes in value to the new slice.
func mustArrayToByteSlice(value reflect.Value) reflect.Value {
slice := reflect.MakeSlice(reflect.TypeOf([]byte{}), value.Len(), value.Len())
reflect.Copy(slice, value)
return slice
}

187
accounts/abi/type.go
Unescape View File

@ -21,8 +21,6 @@ import (
"reflect"
"regexp"
"strconv"
"github.com/ethereum/go-ethereum/common"
)
const (
@ -40,53 +38,60 @@ const (
// Type is the reflection of the supported argument type
type Type struct {
IsSlice bool
SliceSize int
IsSlice, IsArray bool
SliceSize int
Elem *Type
Kind reflect.Kind
Type reflect.Type
Size int
T byte // Our own type checking
Kind reflect.Kind
Type reflect.Type
Size int
T byte // Our own type checking
stringKind string // holds the unparsed string for deriving signatures
}
var (
// fullTypeRegex parses the abi types
//
// Types can be in the format of:
//
// Input = Type [ "[" [ Number ] "]" ] Name .
// Type = [ "u" ] "int" [ Number ] .
//
// Examples:
//
// string int uint real
// string32 int8 uint8 uint[]
// address int256 uint256 real[2]
fullTypeRegex = regexp.MustCompile("([a-zA-Z0-9]+)(\\[([0-9]*)?\\])?")
typeRegex = regexp.MustCompile("([a-zA-Z]+)([0-9]*)?")
// typeRegex parses the abi sub types
typeRegex = regexp.MustCompile("([a-zA-Z]+)([0-9]*)?")
)
// NewType returns a fully parsed Type given by the input string or an error if it can't be parsed.
//
// Strings can be in the format of:
//
// Input = Type [ "[" [ Number ] "]" ] Name .
// Type = [ "u" ] "int" [ Number ] .
//
// Examples:
//
// string int uint real
// string32 int8 uint8 uint[]
// address int256 uint256 real[2]
// NewType creates a new reflection type of abi type given in t.
func NewType(t string) (typ Type, err error) {
// 1. full string 2. type 3. (opt.) is slice 4. (opt.) size
// parse the full representation of the abi-type definition; including:
// * full string
// * type
// * is slice
// * slice size
res := fullTypeRegex.FindAllStringSubmatch(t, -1)[0]
// check if type is slice and parse type.
switch {
case res[3] != "":
// err is ignored. Already checked for number through the regexp
typ.SliceSize, _ = strconv.Atoi(res[3])
typ.IsSlice = true
typ.IsArray = true
case res[2] != "":
typ.IsSlice, typ.SliceSize = true, -1
case res[0] == "":
return Type{}, fmt.Errorf("abi: type parse error: %s", t)
}
if typ.IsArray || typ.IsSlice {
sliceType, err := NewType(res[1])
if err != nil {
return Type{}, err
}
typ.Elem = &sliceType
typ.stringKind = sliceType.stringKind + t[len(res[1]):]
return typ, nil
}
// parse the type and size of the abi-type.
parsedType := typeRegex.FindAllStringSubmatch(res[1], -1)[0]
@ -106,24 +111,24 @@ func NewType(t string) (typ Type, err error) {
varSize = 256
t += "256"
}
typ.stringKind = t
switch varType {
case "int":
typ.Kind = reflect.Int
typ.Kind = reflectIntKind(false, varSize)
typ.Type = big_t
typ.Size = varSize
typ.T = IntTy
case "uint":
typ.Kind = reflect.Uint
typ.Kind = reflectIntKind(true, varSize)
typ.Type = ubig_t
typ.Size = varSize
typ.T = UintTy
case "bool":
typ.Kind = reflect.Bool
typ.T = BoolTy
case "real": // TODO
typ.Kind = reflect.Invalid
case "address":
typ.Kind = reflect.Array
typ.Type = address_t
typ.Size = 20
typ.T = AddressTy
@ -131,123 +136,55 @@ func NewType(t string) (typ Type, err error) {
typ.Kind = reflect.String
typ.Size = -1
typ.T = StringTy
if varSize > 0 {
typ.Size = 32
}
case "hash":
typ.Kind = reflect.Array
typ.Size = 32
typ.Type = hash_t
typ.T = HashTy
case "bytes":
typ.Kind = reflect.Array
typ.Type = byte_ts
typ.Size = varSize
sliceType, _ := NewType("uint8")
typ.Elem = &sliceType
if varSize == 0 {
typ.IsSlice = true
typ.T = BytesTy
typ.SliceSize = -1
} else {
typ.IsArray = true
typ.T = FixedBytesTy
typ.SliceSize = varSize
}
default:
return Type{}, fmt.Errorf("unsupported arg type: %s", t)
}
typ.stringKind = t
return
}
// String implements Stringer
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
// assignable
// * Integer are checked for size
// * Strings, addresses and bytes are checks for type and size
func (t Type) pack(v interface{}) ([]byte, error) {
value := reflect.ValueOf(v)
switch kind := value.Kind(); kind {
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
// check input is unsigned
if t.Type != ubig_t {
return nil, fmt.Errorf("abi: type mismatch: %s for %T", t.Type, v)
}
// no implicit type casting
if int(value.Type().Size()*8) != t.Size {
return nil, fmt.Errorf("abi: cannot use type %T as type uint%d", v, t.Size)
}
return packNum(value, t.T), nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if t.Type != ubig_t {
return nil, fmt.Errorf("type mismatch: %s for %T", t.Type, v)
}
// no implicit type casting
if int(value.Type().Size()*8) != t.Size {
return nil, fmt.Errorf("abi: cannot use type %T as type uint%d", v, t.Size)
}
return packNum(value, t.T), nil
case reflect.Ptr:
// If the value is a ptr do a assign check (only used by
// big.Int for now)
if t.Type == ubig_t && value.Type() != ubig_t {
return nil, fmt.Errorf("type mismatch: %s for %T", t.Type, v)
}
return packNum(value, t.T), nil
case reflect.String:
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 packBytesSlice([]byte(value.String()), value.Len()), nil
case reflect.Slice:
// Byte slice is a special case, it gets treated as a single value
if t.T == BytesTy {
return packBytesSlice(value.Bytes(), value.Len()), nil
}
if t.SliceSize > -1 && value.Len() > t.SliceSize {
return nil, fmt.Errorf("%v out of bound. %d for %d", value.Kind(), value.Len(), t.Size)
}
func (t Type) pack(v reflect.Value) ([]byte, error) {
// dereference pointer first if it's a pointer
v = indirect(v)
// Signed / Unsigned check
if value.Type() == big_t && (t.T != IntTy && isSigned(value)) || (t.T == UintTy && isSigned(value)) {
return nil, fmt.Errorf("slice of incompatible types.")
}
if err := typeCheck(t, v); err != nil {
return nil, err
}
if (t.IsSlice || t.IsArray) && t.T != BytesTy && t.T != FixedBytesTy {
var packed []byte
for i := 0; i < value.Len(); i++ {
val, err := t.pack(value.Index(i).Interface())
for i := 0; i < v.Len(); i++ {
val, err := t.Elem.pack(v.Index(i))
if err != nil {
return nil, err
}
packed = append(packed, val...)
}
return packBytesSlice(packed, value.Len()), nil
case reflect.Bool:
if value.Bool() {
return common.LeftPadBytes(common.Big1.Bytes(), 32), nil
} else {
return common.LeftPadBytes(common.Big0.Bytes(), 32), nil
}
case reflect.Array:
if v, ok := value.Interface().(common.Address); ok {
return common.LeftPadBytes(v[:], 32), nil
} else if v, ok := value.Interface().(common.Hash); ok {
return v[:], nil
}
return packBytesSlice(packed, v.Len()), nil
}
return nil, fmt.Errorf("ABI: bad input given %v", value.Kind())
return packElement(t, v), nil
}
// requireLengthPrefix returns whether the type requires any sort of length
// prefixing.
func (t Type) requiresLengthPrefix() bool {
return t.T != FixedBytesTy && (t.T == StringTy || t.T == BytesTy || t.IsSlice || t.IsArray)
}

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