mirror of https://github.com/poanetwork/quorum.git
388 lines
12 KiB
Go
388 lines
12 KiB
Go
// 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 (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"math/big"
|
|
"reflect"
|
|
"strings"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
)
|
|
|
|
// The ABI holds information about a contract's context and available
|
|
// invokable methods. It will allow you to type check function calls and
|
|
// packs data accordingly.
|
|
type ABI struct {
|
|
Constructor Method
|
|
Methods map[string]Method
|
|
Events map[string]Event
|
|
}
|
|
|
|
// JSON returns a parsed ABI interface and error if it failed.
|
|
func JSON(reader io.Reader) (ABI, error) {
|
|
dec := json.NewDecoder(reader)
|
|
|
|
var abi ABI
|
|
if err := dec.Decode(&abi); err != nil {
|
|
return ABI{}, err
|
|
}
|
|
|
|
return abi, 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.
|
|
// Method ids are created from the first 4 bytes of the hash of the
|
|
// methods string signature. (signature = baz(uint32,string32))
|
|
func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
|
|
// Fetch the ABI of the requested method
|
|
var method Method
|
|
|
|
if name == "" {
|
|
method = abi.Constructor
|
|
} else {
|
|
m, exist := abi.Methods[name]
|
|
if !exist {
|
|
return nil, fmt.Errorf("method '%s' not found", name)
|
|
}
|
|
method = m
|
|
}
|
|
arguments, err := method.pack(method, args...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Pack up the method ID too if not a constructor and return
|
|
if name == "" {
|
|
return arguments, nil
|
|
}
|
|
return append(method.Id(), arguments...), nil
|
|
}
|
|
|
|
// toGoSliceType parses the input and casts it to the proper slice defined by the ABI
|
|
// argument in T.
|
|
func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
|
|
index := i * 32
|
|
// The slice must, at very least be large enough for the index+32 which is exactly the size required
|
|
// for the [offset in output, size of offset].
|
|
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 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", elem.T)
|
|
}
|
|
|
|
var slice []byte
|
|
var size int
|
|
var offset int
|
|
if t.Type.IsSlice {
|
|
|
|
// get the offset which determines the start of this array ...
|
|
offset = int(common.BytesToBig(output[index : index+32]).Uint64())
|
|
if offset+32 > len(output) {
|
|
return nil, fmt.Errorf("abi: cannot marshal in to go slice: offset %d would go over slice boundary (len=%d)", len(output), offset+32)
|
|
}
|
|
|
|
slice = output[offset:]
|
|
// ... starting with the size of the array in elements ...
|
|
size = int(common.BytesToBig(slice[:32]).Uint64())
|
|
slice = slice[32:]
|
|
// ... and make sure that we've at the very least the amount of bytes
|
|
// available in the buffer.
|
|
if size*32 > len(slice) {
|
|
return nil, fmt.Errorf("abi: cannot marshal in to go slice: insufficient size output %d require %d", len(output), offset+32+size*32)
|
|
}
|
|
|
|
// reslice to match the required size
|
|
slice = slice[:(size * 32)]
|
|
} else if t.Type.IsArray {
|
|
//get the number of elements in the array
|
|
size = t.Type.SliceSize
|
|
|
|
//check to make sure array size matches up
|
|
if index+32*size > len(output) {
|
|
return nil, fmt.Errorf("abi: cannot marshal in to go array: offset %d would go over slice boundary (len=%d)", len(output), index+32*size)
|
|
}
|
|
//slice is there for a fixed amount of times
|
|
slice = output[index : index+size*32]
|
|
}
|
|
|
|
for i := 0; i < size; i++ {
|
|
var (
|
|
inter interface{} // interface type
|
|
returnOutput = slice[i*32 : i*32+32] // the return output
|
|
)
|
|
|
|
// set inter to the correct type (cast)
|
|
switch elem.T {
|
|
case IntTy, UintTy:
|
|
inter = common.BytesToBig(returnOutput)
|
|
case BoolTy:
|
|
inter = common.BytesToBig(returnOutput).Uint64() > 0
|
|
case AddressTy:
|
|
inter = common.BytesToAddress(returnOutput)
|
|
case HashTy:
|
|
inter = common.BytesToHash(returnOutput)
|
|
case FixedBytesTy:
|
|
inter = returnOutput
|
|
}
|
|
// append the item to our reflect slice
|
|
refSlice = reflect.Append(refSlice, reflect.ValueOf(inter))
|
|
}
|
|
|
|
// return the interface
|
|
return refSlice.Interface(), nil
|
|
}
|
|
|
|
// toGoType parses the input and casts it to the proper type defined by the ABI
|
|
// argument in T.
|
|
func toGoType(i int, t Argument, output []byte) (interface{}, error) {
|
|
// we need to treat slices differently
|
|
if (t.Type.IsSlice || t.Type.IsArray) && t.Type.T != BytesTy && t.Type.T != StringTy && t.Type.T != FixedBytesTy {
|
|
return toGoSlice(i, t, output)
|
|
}
|
|
|
|
index := i * 32
|
|
if index+32 > len(output) {
|
|
return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), index+32)
|
|
}
|
|
|
|
// Parse the given index output and check whether we need to read
|
|
// a different offset and length based on the type (i.e. string, bytes)
|
|
var returnOutput []byte
|
|
switch t.Type.T {
|
|
case StringTy, BytesTy: // variable arrays are written at the end of the return bytes
|
|
// parse offset from which we should start reading
|
|
offset := int(common.BytesToBig(output[index : index+32]).Uint64())
|
|
if offset+32 > len(output) {
|
|
return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), offset+32)
|
|
}
|
|
// parse the size up until we should be reading
|
|
size := int(common.BytesToBig(output[offset : offset+32]).Uint64())
|
|
if offset+32+size > len(output) {
|
|
return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), offset+32+size)
|
|
}
|
|
|
|
// get the bytes for this return value
|
|
returnOutput = output[offset+32 : offset+32+size]
|
|
default:
|
|
returnOutput = output[index : index+32]
|
|
}
|
|
|
|
// convert the bytes to whatever is specified by the ABI.
|
|
switch t.Type.T {
|
|
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:
|
|
return common.BytesToAddress(returnOutput), nil
|
|
case HashTy:
|
|
return common.BytesToHash(returnOutput), nil
|
|
case BytesTy, FixedBytesTy:
|
|
return returnOutput, nil
|
|
case StringTy:
|
|
return string(returnOutput), nil
|
|
}
|
|
return nil, fmt.Errorf("abi: unknown type %v", t.Type.T)
|
|
}
|
|
|
|
// 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))
|
|
)
|
|
|
|
// Unpack output in v according to the abi specification
|
|
func (abi ABI) Unpack(v interface{}, name string, output []byte) error {
|
|
var method = abi.Methods[name]
|
|
|
|
if len(output) == 0 {
|
|
return fmt.Errorf("abi: unmarshalling empty output")
|
|
}
|
|
|
|
// make sure the passed value is a pointer
|
|
valueOf := reflect.ValueOf(v)
|
|
if reflect.Ptr != valueOf.Kind() {
|
|
return fmt.Errorf("abi: Unpack(non-pointer %T)", v)
|
|
}
|
|
|
|
var (
|
|
value = valueOf.Elem()
|
|
typ = value.Type()
|
|
)
|
|
|
|
if len(method.Outputs) > 1 {
|
|
switch value.Kind() {
|
|
// struct will match named return values to the struct's field
|
|
// names
|
|
case reflect.Struct:
|
|
for i := 0; i < len(method.Outputs); i++ {
|
|
marshalledValue, err := toGoType(i, method.Outputs[i], output)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
reflectValue := reflect.ValueOf(marshalledValue)
|
|
|
|
for j := 0; j < typ.NumField(); j++ {
|
|
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 err := set(value.Field(j), reflectValue, method.Outputs[i]); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
}
|
|
case reflect.Slice:
|
|
if !value.Type().AssignableTo(r_interSlice) {
|
|
return fmt.Errorf("abi: cannot marshal tuple in to slice %T (only []interface{} is supported)", v)
|
|
}
|
|
|
|
// if the slice already contains values, set those instead of the interface slice itself.
|
|
if value.Len() > 0 {
|
|
if len(method.Outputs) > value.Len() {
|
|
return fmt.Errorf("abi: cannot marshal in to slices of unequal size (require: %v, got: %v)", len(method.Outputs), value.Len())
|
|
}
|
|
|
|
for i := 0; i < len(method.Outputs); i++ {
|
|
marshalledValue, err := toGoType(i, method.Outputs[i], output)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
reflectValue := reflect.ValueOf(marshalledValue)
|
|
if err := set(value.Index(i).Elem(), reflectValue, method.Outputs[i]); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// create a new slice and start appending the unmarshalled
|
|
// values to the new interface slice.
|
|
z := reflect.MakeSlice(typ, 0, len(method.Outputs))
|
|
for i := 0; i < len(method.Outputs); i++ {
|
|
marshalledValue, err := toGoType(i, method.Outputs[i], output)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
z = reflect.Append(z, reflect.ValueOf(marshalledValue))
|
|
}
|
|
value.Set(z)
|
|
default:
|
|
return fmt.Errorf("abi: cannot unmarshal tuple in to %v", typ)
|
|
}
|
|
|
|
} else {
|
|
marshalledValue, err := toGoType(0, method.Outputs[0], output)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := set(value, reflect.ValueOf(marshalledValue), method.Outputs[0]); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (abi *ABI) UnmarshalJSON(data []byte) error {
|
|
var fields []struct {
|
|
Type string
|
|
Name string
|
|
Constant bool
|
|
Indexed bool
|
|
Anonymous bool
|
|
Inputs []Argument
|
|
Outputs []Argument
|
|
}
|
|
|
|
if err := json.Unmarshal(data, &fields); err != nil {
|
|
return err
|
|
}
|
|
|
|
abi.Methods = make(map[string]Method)
|
|
abi.Events = make(map[string]Event)
|
|
for _, field := range fields {
|
|
switch field.Type {
|
|
case "constructor":
|
|
abi.Constructor = Method{
|
|
Inputs: field.Inputs,
|
|
}
|
|
// empty defaults to function according to the abi spec
|
|
case "function", "":
|
|
abi.Methods[field.Name] = Method{
|
|
Name: field.Name,
|
|
Const: field.Constant,
|
|
Inputs: field.Inputs,
|
|
Outputs: field.Outputs,
|
|
}
|
|
case "event":
|
|
abi.Events[field.Name] = Event{
|
|
Name: field.Name,
|
|
Anonymous: field.Anonymous,
|
|
Inputs: field.Inputs,
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|