mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-21 19:20:39 +00:00
274 lines
8.1 KiB
Go
274 lines
8.1 KiB
Go
// 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 (
|
|
"errors"
|
|
"fmt"
|
|
"math/big"
|
|
"reflect"
|
|
"strings"
|
|
)
|
|
|
|
// ConvertType converts an interface of a runtime type into a interface of the
|
|
// given type
|
|
// e.g. turn
|
|
// var fields []reflect.StructField
|
|
//
|
|
// fields = append(fields, reflect.StructField{
|
|
// Name: "X",
|
|
// Type: reflect.TypeOf(new(big.Int)),
|
|
// Tag: reflect.StructTag("json:\"" + "x" + "\""),
|
|
// }
|
|
//
|
|
// into
|
|
// type TupleT struct { X *big.Int }
|
|
func ConvertType(in interface{}, proto interface{}) interface{} {
|
|
protoType := reflect.TypeOf(proto)
|
|
if reflect.TypeOf(in).ConvertibleTo(protoType) {
|
|
return reflect.ValueOf(in).Convert(protoType).Interface()
|
|
}
|
|
// Use set as a last ditch effort
|
|
if err := set(reflect.ValueOf(proto), reflect.ValueOf(in)); err != nil {
|
|
panic(err)
|
|
}
|
|
return proto
|
|
}
|
|
|
|
// 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() != reflect.TypeOf(big.Int{}) {
|
|
return indirect(v.Elem())
|
|
}
|
|
return v
|
|
}
|
|
|
|
// reflectIntType returns the reflect using the given size and
|
|
// unsignedness.
|
|
func reflectIntType(unsigned bool, size int) reflect.Type {
|
|
if unsigned {
|
|
switch size {
|
|
case 8:
|
|
return reflect.TypeOf(uint8(0))
|
|
case 16:
|
|
return reflect.TypeOf(uint16(0))
|
|
case 32:
|
|
return reflect.TypeOf(uint32(0))
|
|
case 64:
|
|
return reflect.TypeOf(uint64(0))
|
|
}
|
|
}
|
|
switch size {
|
|
case 8:
|
|
return reflect.TypeOf(int8(0))
|
|
case 16:
|
|
return reflect.TypeOf(int16(0))
|
|
case 32:
|
|
return reflect.TypeOf(int32(0))
|
|
case 64:
|
|
return reflect.TypeOf(int64(0))
|
|
}
|
|
return reflect.TypeOf(&big.Int{})
|
|
}
|
|
|
|
// mustArrayToByteSlice 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
|
|
}
|
|
|
|
// 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) error {
|
|
dstType, srcType := dst.Type(), src.Type()
|
|
switch {
|
|
case dstType.Kind() == reflect.Interface && dst.Elem().IsValid():
|
|
return set(dst.Elem(), src)
|
|
case dstType.Kind() == reflect.Ptr && dstType.Elem() != reflect.TypeOf(big.Int{}):
|
|
return set(dst.Elem(), src)
|
|
case srcType.AssignableTo(dstType) && dst.CanSet():
|
|
dst.Set(src)
|
|
case dstType.Kind() == reflect.Slice && srcType.Kind() == reflect.Slice && dst.CanSet():
|
|
return setSlice(dst, src)
|
|
case dstType.Kind() == reflect.Array:
|
|
return setArray(dst, src)
|
|
case dstType.Kind() == reflect.Struct:
|
|
return setStruct(dst, src)
|
|
default:
|
|
return fmt.Errorf("abi: cannot unmarshal %v in to %v", src.Type(), dst.Type())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// setSlice attempts to assign src to dst when slices are not assignable by default
|
|
// e.g. src: [][]byte -> dst: [][15]byte
|
|
// setSlice ignores if we cannot copy all of src' elements.
|
|
func setSlice(dst, src reflect.Value) error {
|
|
slice := reflect.MakeSlice(dst.Type(), src.Len(), src.Len())
|
|
for i := 0; i < src.Len(); i++ {
|
|
if src.Index(i).Kind() == reflect.Struct {
|
|
if err := set(slice.Index(i), src.Index(i)); err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
// e.g. [][32]uint8 to []libcommon.Hash
|
|
if err := set(slice.Index(i), src.Index(i)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
if dst.CanSet() {
|
|
dst.Set(slice)
|
|
return nil
|
|
}
|
|
return errors.New("cannot set slice, destination not settable")
|
|
}
|
|
|
|
func setArray(dst, src reflect.Value) error {
|
|
if src.Kind() == reflect.Ptr {
|
|
return set(dst, indirect(src))
|
|
}
|
|
array := reflect.New(dst.Type()).Elem()
|
|
min := src.Len()
|
|
if src.Len() > dst.Len() {
|
|
min = dst.Len()
|
|
}
|
|
for i := 0; i < min; i++ {
|
|
if err := set(array.Index(i), src.Index(i)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if dst.CanSet() {
|
|
dst.Set(array)
|
|
return nil
|
|
}
|
|
return errors.New("cannot set array, destination not settable")
|
|
}
|
|
|
|
func setStruct(dst, src reflect.Value) error {
|
|
for i := 0; i < src.NumField(); i++ {
|
|
srcField := src.Field(i)
|
|
dstField := dst.Field(i)
|
|
if !dstField.IsValid() || !srcField.IsValid() {
|
|
return fmt.Errorf("could not find src field: %v value: %v in destination", srcField.Type().Name(), srcField)
|
|
}
|
|
if err := set(dstField, srcField); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// mapArgNamesToStructFields maps a slice of argument names to struct fields.
|
|
// first round: for each Exportable field that contains a `abi:""` tag
|
|
//
|
|
// and this field name exists in the given argument name list, pair them together.
|
|
//
|
|
// second round: for each argument name that has not been already linked,
|
|
//
|
|
// find what variable is expected to be mapped into, if it exists and has not been
|
|
// used, pair them.
|
|
//
|
|
// Note this function assumes the given value is a struct value.
|
|
func mapArgNamesToStructFields(argNames []string, value reflect.Value) (map[string]string, error) {
|
|
typ := value.Type()
|
|
|
|
abi2struct := make(map[string]string)
|
|
struct2abi := make(map[string]string)
|
|
|
|
// first round ~~~
|
|
for i := 0; i < typ.NumField(); i++ {
|
|
structFieldName := typ.Field(i).Name
|
|
|
|
// skip private struct fields.
|
|
if structFieldName[:1] != strings.ToUpper(structFieldName[:1]) {
|
|
continue
|
|
}
|
|
// skip fields that have no abi:"" tag.
|
|
tagName, ok := typ.Field(i).Tag.Lookup("abi")
|
|
if !ok {
|
|
continue
|
|
}
|
|
// check if tag is empty.
|
|
if tagName == "" {
|
|
return nil, fmt.Errorf("struct: abi tag in '%s' is empty", structFieldName)
|
|
}
|
|
// check which argument field matches with the abi tag.
|
|
found := false
|
|
for _, arg := range argNames {
|
|
if arg == tagName {
|
|
if abi2struct[arg] != "" {
|
|
return nil, fmt.Errorf("struct: abi tag in '%s' already mapped", structFieldName)
|
|
}
|
|
// pair them
|
|
abi2struct[arg] = structFieldName
|
|
struct2abi[structFieldName] = arg
|
|
found = true
|
|
}
|
|
}
|
|
// check if this tag has been mapped.
|
|
if !found {
|
|
return nil, fmt.Errorf("struct: abi tag '%s' defined but not found in abi", tagName)
|
|
}
|
|
}
|
|
|
|
// second round ~~~
|
|
for _, argName := range argNames {
|
|
|
|
structFieldName := ToCamelCase(argName)
|
|
|
|
if structFieldName == "" {
|
|
return nil, fmt.Errorf("abi: purely underscored output cannot unpack to struct")
|
|
}
|
|
|
|
// this abi has already been paired, skip it... unless there exists another, yet unassigned
|
|
// struct field with the same field name. If so, raise an error:
|
|
// abi: [ { "name": "value" } ]
|
|
// struct { Value *big.Int , Value1 *big.Int `abi:"value"`}
|
|
if abi2struct[argName] != "" {
|
|
if abi2struct[argName] != structFieldName &&
|
|
struct2abi[structFieldName] == "" &&
|
|
value.FieldByName(structFieldName).IsValid() {
|
|
return nil, fmt.Errorf("abi: multiple variables maps to the same abi field '%s'", argName)
|
|
}
|
|
continue
|
|
}
|
|
|
|
// return an error if this struct field has already been paired.
|
|
if struct2abi[structFieldName] != "" {
|
|
return nil, fmt.Errorf("abi: multiple outputs mapping to the same struct field '%s'", structFieldName)
|
|
}
|
|
|
|
if value.FieldByName(structFieldName).IsValid() {
|
|
// pair them
|
|
abi2struct[argName] = structFieldName
|
|
struct2abi[structFieldName] = argName
|
|
} else {
|
|
// not paired, but annotate as used, to detect cases like
|
|
// abi : [ { "name": "value" }, { "name": "_value" } ]
|
|
// struct { Value *big.Int }
|
|
struct2abi[structFieldName] = argName
|
|
}
|
|
}
|
|
return abi2struct, nil
|
|
}
|