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accounts/abi: support for typed array

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Added support for fixed size and arbitrary length byte arrays to be
marshallable in fixed size (typed) byte slices.
This commit is contained in:
Jeffrey Wilcke 2016-02-13 01:42:23 +01:00
parent cb85923828
commit 6fe917ecb8
2 changed files with 114 additions and 43 deletions
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51
accounts/abi/abi.go
View File

@ -165,7 +165,14 @@ func (abi ABI) Call(executer Executer, v interface{}, name string, args ...inter
return abi.unmarshal(v, name, executer(callData))
}
var interSlice = reflect.TypeOf([]interface{}{})
// these variable are used to determine certain types during type assertion for
// assignment.
var (
r_interSlice = reflect.TypeOf([]interface{}{})
r_hash = reflect.TypeOf(common.Hash{})
r_bytes = reflect.TypeOf([]byte{})
r_byte = reflect.TypeOf(byte(0))
)
// unmarshal output in v according to the abi specification
func (abi ABI) unmarshal(v interface{}, name string, output []byte) error {
@ -194,17 +201,14 @@ func (abi ABI) unmarshal(v interface{}, name string, output []byte) error {
field := typ.Field(j)
// TODO read tags: `abi:"fieldName"`
if field.Name == strings.ToUpper(method.Outputs[i].Name[:1])+method.Outputs[i].Name[1:] {
if field.Type.AssignableTo(reflectValue.Type()) {
value.Field(j).Set(reflectValue)
break
} else {
return fmt.Errorf("abi: cannot unmarshal %v in to %v", field.Type, reflectValue.Type())
if err := set(value.Field(j), reflectValue, method.Outputs[i]); err != nil {
return err
}
}
}
}
case reflect.Slice:
if !value.Type().AssignableTo(interSlice) {
if !value.Type().AssignableTo(r_interSlice) {
return fmt.Errorf("abi: cannot marshal tuple in to slice %T (only []interface{} is supported)", v)
}
@ -228,17 +232,40 @@ func (abi ABI) unmarshal(v interface{}, name string, output []byte) error {
if err != nil {
return err
}
reflectValue := reflect.ValueOf(marshalledValue)
if typ.AssignableTo(reflectValue.Type()) {
value.Set(reflectValue)
} else {
return fmt.Errorf("abi: cannot unmarshal %v in to %v", reflectValue.Type(), value.Type())
if err := set(value, reflect.ValueOf(marshalledValue), method.Outputs[0]); err != nil {
return err
}
}
return nil
}
// set attempts to assign src to dst by either setting, copying or otherwise.
//
// set is a bit more lenient when it comes to assignment and doesn't force an as
// strict ruleset as bare `reflect` does.
func set(dst, src reflect.Value, output Argument) error {
dstType := dst.Type()
srcType := src.Type()
switch {
case dstType.AssignableTo(src.Type()):
dst.Set(src)
case dstType.Kind() == reflect.Array && srcType.Kind() == reflect.Slice:
if !dstType.Elem().AssignableTo(r_byte) {
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())
}
reflect.Copy(dst, src)
default:
return fmt.Errorf("abi: cannot unmarshal %v in to %v", src.Type(), dst.Type())
}
return nil
}
func (abi *ABI) UnmarshalJSON(data []byte) error {
var fields []struct {
Type string

106
accounts/abi/abi_test.go
View File

@ -394,37 +394,6 @@ func TestBytes(t *testing.T) {
}
}
/*
func TestReturn(t *testing.T) {
const definition = `[
{ "type" : "function", "name" : "balance", "const" : true, "inputs" : [], "outputs" : [ { "name": "", "type": "hash" } ] },
{ "type" : "function", "name" : "name", "const" : true, "inputs" : [], "outputs" : [ { "name": "", "type": "address" } ] }]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
t.Fatal(err)
}
r := abi.Call(func([]byte) []byte {
t := make([]byte, 32)
t[0] = 1
return t
}, "balance")
if _, ok := r.(common.Hash); !ok {
t.Errorf("expected type common.Hash, got %T", r)
}
r = abi.Call(func([]byte) []byte {
t := make([]byte, 32)
t[0] = 1
return t
}, "name")
if _, ok := r.(common.Address); !ok {
t.Errorf("expected type common.Address, got %T", r)
}
}
*/
func TestDefaultFunctionParsing(t *testing.T) {
const definition = `[{ "name" : "balance" }]`
@ -550,11 +519,71 @@ 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" } ] }
]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
t.Fatal(err)
}
output := common.LeftPadBytes([]byte{1}, 32)
var bytes10 [10]byte
err = abi.unmarshal(&bytes10, "bytes32", output)
if err == nil || err.Error() != "abi: cannot unmarshal src (len=32) in to dst (len=10)" {
t.Error("expected error or bytes32 not be assignable to bytes10:", err)
}
var bytes32 [32]byte
err = abi.unmarshal(&bytes32, "bytes32", output)
if err != nil {
t.Error("didn't expect error:", err)
}
if !bytes.Equal(bytes32[:], output) {
t.Error("expected bytes32[31] to be 1 got", bytes32[31])
}
type (
B10 [10]byte
B32 [32]byte
)
var b10 B10
err = abi.unmarshal(&b10, "bytes32", output)
if err == nil || err.Error() != "abi: cannot unmarshal src (len=32) in to dst (len=10)" {
t.Error("expected error or bytes32 not be assignable to bytes10:", err)
}
var b32 B32
err = abi.unmarshal(&b32, "bytes32", output)
if err != nil {
t.Error("didn't expect error:", err)
}
if !bytes.Equal(b32[:], output) {
t.Error("expected bytes32[31] to be 1 got", bytes32[31])
}
output[10] = 1
var shortAssignLong [32]byte
err = abi.unmarshal(&shortAssignLong, "bytes10", output)
if err != nil {
t.Error("didn't expect error:", err)
}
if !bytes.Equal(output, shortAssignLong[:]) {
t.Errorf("expected %x to be %x", shortAssignLong, output)
}
}
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" : "mixedBytes", "const" : true, "outputs": [ { "name": "a", "type": "bytes" }, { "name": "b", "type": "bytes32" } ] }]`
@ -655,6 +684,21 @@ func TestUnmarshal(t *testing.T) {
t.Errorf("expected %x got %x", bytesOut, Bytes)
}
// marshal dynamic bytes length 5
buff.Reset()
buff.Write(common.RightPadBytes([]byte("hello"), 32))
var hash common.Hash
err = abi.unmarshal(&hash, "fixed", buff.Bytes())
if err != nil {
t.Error(err)
}
helloHash := common.BytesToHash(common.RightPadBytes([]byte("hello"), 32))
if hash != helloHash {
t.Errorf("Expected %x to equal %x", hash, helloHash)
}
// marshal error
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))