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argument.go
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argument.go
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package abi
import (
"encoding/json"
"fmt"
"reflect"
"strings"
)
type Argument struct {
Name string
Type Type
Indexed bool
}
type Arguments []Argument
type ArgumentMarshaling struct {
Name string
Type string
InternalType string
Components []ArgumentMarshaling
Indexed bool
}
func (argument *Argument) UnmarshalJSON(data []byte) error {
var arg ArgumentMarshaling
err := json.Unmarshal(data, &arg)
if err != nil {
return fmt.Errorf("argument json err: %v", err)
}
argument.Type, err = NewType(arg.Type, arg.InternalType, arg.Components)
if err != nil {
return err
}
argument.Name = arg.Name
argument.Indexed = arg.Indexed
return nil
}
func (arguments Arguments) LengthNonIndexed() int {
out := 0
for _, arg := range arguments {
if !arg.Indexed {
out++
}
}
return out
}
func (arguments Arguments) NonIndexed() Arguments {
var ret []Argument
for _, arg := range arguments {
if !arg.Indexed {
ret = append(ret, arg)
}
}
return ret
}
func (arguments Arguments) isTuple() bool {
return len(arguments) > 1
}
func (arguments Arguments) Unpack(v interface{}, data []byte) error {
if len(data) == 0 {
if len(arguments) != 0 {
return fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
} else {
return nil
}
}
if reflect.Ptr != reflect.ValueOf(v).Kind() {
return fmt.Errorf("abi: Unpack(non-pointer %T)", v)
}
marshalledValues, err := arguments.UnpackValues(data)
if err != nil {
return err
}
if arguments.isTuple() {
return arguments.unpackTuple(v, marshalledValues)
}
return arguments.unpackAtomic(v, marshalledValues[0])
}
func (arguments Arguments) UnpackIntoMap(v map[string]interface{}, data []byte) error {
if len(data) == 0 {
if len(arguments) != 0 {
return fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
} else {
return nil
}
}
marshalledValues, err := arguments.UnpackValues(data)
if err != nil {
return err
}
return arguments.unpackIntoMap(v, marshalledValues)
}
func unpack(t *Type, dst interface{}, src interface{}) error {
var (
dstVal = reflect.ValueOf(dst).Elem()
srcVal = reflect.ValueOf(src)
)
tuple, typ := false, t
for {
if typ.T == SliceTy || typ.T == ArrayTy {
typ = typ.Elem
continue
}
tuple = typ.T == TupleTy
break
}
if !tuple {
return set(dstVal, srcVal)
}
dstVal = indirectInterfaceOrPtr(dstVal)
switch t.T {
case TupleTy:
if dstVal.Kind() != reflect.Struct {
return fmt.Errorf("abi: invalid dst value for unpack, want struct, got %s", dstVal.Kind())
}
fieldmap, err := mapArgNamesToStructFields(t.TupleRawNames, dstVal)
if err != nil {
return err
}
for i, elem := range t.TupleElems {
fname := fieldmap[t.TupleRawNames[i]]
field := dstVal.FieldByName(fname)
if !field.IsValid() {
return fmt.Errorf("abi: field %s can't found in the given value", t.TupleRawNames[i])
}
if err := unpack(elem, field.Addr().Interface(), srcVal.Field(i).Interface()); err != nil {
return err
}
}
return nil
case SliceTy:
if dstVal.Kind() != reflect.Slice {
return fmt.Errorf("abi: invalid dst value for unpack, want slice, got %s", dstVal.Kind())
}
slice := reflect.MakeSlice(dstVal.Type(), srcVal.Len(), srcVal.Len())
for i := 0; i < slice.Len(); i++ {
if err := unpack(t.Elem, slice.Index(i).Addr().Interface(), srcVal.Index(i).Interface()); err != nil {
return err
}
}
dstVal.Set(slice)
case ArrayTy:
if dstVal.Kind() != reflect.Array {
return fmt.Errorf("abi: invalid dst value for unpack, want array, got %s", dstVal.Kind())
}
array := reflect.New(dstVal.Type()).Elem()
for i := 0; i < array.Len(); i++ {
if err := unpack(t.Elem, array.Index(i).Addr().Interface(), srcVal.Index(i).Interface()); err != nil {
return err
}
}
dstVal.Set(array)
}
return nil
}
func (arguments Arguments) unpackIntoMap(v map[string]interface{}, marshalledValues []interface{}) error {
if v == nil {
return fmt.Errorf("abi: cannot unpack into a nil map")
}
for i, arg := range arguments.NonIndexed() {
v[arg.Name] = marshalledValues[i]
}
return nil
}
func (arguments Arguments) unpackAtomic(v interface{}, marshalledValues interface{}) error {
if arguments.LengthNonIndexed() == 0 {
return nil
}
argument := arguments.NonIndexed()[0]
elem := reflect.ValueOf(v).Elem()
if elem.Kind() == reflect.Struct && argument.Type.T != TupleTy {
fieldmap, err := mapArgNamesToStructFields([]string{argument.Name}, elem)
if err != nil {
return err
}
field := elem.FieldByName(fieldmap[argument.Name])
if !field.IsValid() {
return fmt.Errorf("abi: field %s can't be found in the given value", argument.Name)
}
return unpack(&argument.Type, field.Addr().Interface(), marshalledValues)
}
return unpack(&argument.Type, elem.Addr().Interface(), marshalledValues)
}
func (arguments Arguments) unpackTuple(v interface{}, marshalledValues []interface{}) error {
var (
value = reflect.ValueOf(v).Elem()
typ = value.Type()
kind = value.Kind()
)
if err := requireUnpackKind(value, typ, kind, arguments); err != nil {
return err
}
var abi2struct map[string]string
if kind == reflect.Struct {
var (
argNames []string
err error
)
for _, arg := range arguments.NonIndexed() {
argNames = append(argNames, arg.Name)
}
abi2struct, err = mapArgNamesToStructFields(argNames, value)
if err != nil {
return err
}
}
for i, arg := range arguments.NonIndexed() {
switch kind {
case reflect.Struct:
field := value.FieldByName(abi2struct[arg.Name])
if !field.IsValid() {
return fmt.Errorf("abi: field %s can't be found in the given value", arg.Name)
}
if err := unpack(&arg.Type, field.Addr().Interface(), marshalledValues[i]); err != nil {
return err
}
case reflect.Slice, reflect.Array:
if value.Len() < i {
return fmt.Errorf("abi: insufficient number of arguments for unpack, want %d, got %d", len(arguments), value.Len())
}
v := value.Index(i)
if err := requireAssignable(v, reflect.ValueOf(marshalledValues[i])); err != nil {
return err
}
if err := unpack(&arg.Type, v.Addr().Interface(), marshalledValues[i]); err != nil {
return err
}
default:
return fmt.Errorf("abi:[2] cannot unmarshal tuple in to %v", typ)
}
}
return nil
}
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 && !isDynamicType(arg.Type) {
virtualArgs += getTypeSize(arg.Type)/32 - 1
} else if arg.Type.T == TupleTy && !isDynamicType(arg.Type) {
virtualArgs += getTypeSize(arg.Type)/32 - 1
}
if err != nil {
return nil, err
}
retval = append(retval, marshalledValue)
}
return retval, nil
}
func (arguments Arguments) PackValues(args []interface{}) ([]byte, error) {
return arguments.Pack(args...)
}
func (arguments Arguments) Pack(args ...interface{}) ([]byte, error) {
abiArgs := arguments
if len(args) != len(abiArgs) {
return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(abiArgs))
}
var variableInput []byte
inputOffset := 0
for _, abiArg := range abiArgs {
inputOffset += getTypeSize(abiArg.Type)
}
var ret []byte
for i, a := range args {
input := abiArgs[i]
packed, err := input.Type.pack(reflect.ValueOf(a))
if err != nil {
return nil, err
}
if isDynamicType(input.Type) {
ret = append(ret, packNum(reflect.ValueOf(inputOffset))...)
inputOffset += len(packed)
variableInput = append(variableInput, packed...)
} else {
ret = append(ret, packed...)
}
}
ret = append(ret, variableInput...)
return ret, nil
}
func ToCamelCase(input string) string {
parts := strings.Split(input, "_")
for i, s := range parts {
if len(s) > 0 {
parts[i] = strings.ToUpper(s[:1]) + s[1:]
}
}
return strings.Join(parts, "")
}