mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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151 lines
4.3 KiB
Go
151 lines
4.3 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package abi
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import (
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"bytes"
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"errors"
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"fmt"
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"reflect"
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"strings"
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libcommon "github.com/ledgerwatch/erigon-lib/common"
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"github.com/ledgerwatch/erigon/crypto"
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)
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type Error struct {
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Name string
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Inputs Arguments
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str string
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// Sig contains the string signature according to the ABI spec.
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// e.g. event foo(uint32 a, int b) = "foo(uint32,int256)"
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// Please note that "int" is substitute for its canonical representation "int256"
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Sig string
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// ID returns the canonical representation of the event's signature used by the
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// abi definition to identify event names and types.
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ID libcommon.Hash
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}
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func NewError(name string, inputs Arguments) Error {
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names := make([]string, len(inputs))
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types := make([]string, len(inputs))
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for i, input := range inputs {
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if input.Name == "" {
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inputs[i] = Argument{
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Name: fmt.Sprintf("arg%d", i),
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Indexed: input.Indexed,
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Type: input.Type,
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}
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} else {
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inputs[i] = input
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}
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// string representation
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names[i] = fmt.Sprintf("%v %v", input.Type, inputs[i].Name)
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if input.Indexed {
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names[i] = fmt.Sprintf("%v indexed %v", input.Type, inputs[i].Name)
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}
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// sig representation
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types[i] = input.Type.String()
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}
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str := fmt.Sprintf("error %v(%v)", name, strings.Join(names, ", "))
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sig := fmt.Sprintf("%v(%v)", name, strings.Join(types, ","))
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id := libcommon.BytesToHash(crypto.Keccak256([]byte(sig)))
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return Error{
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Name: name,
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Inputs: inputs,
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str: str,
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Sig: sig,
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ID: id,
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}
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}
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func (e *Error) String() string {
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return e.str
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}
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func (e *Error) Unpack(data []byte) (interface{}, error) {
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if len(data) < 4 {
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return "", errors.New("invalid data for unpacking")
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}
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if !bytes.Equal(data[:4], e.ID[:4]) {
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return "", errors.New("invalid data for unpacking")
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}
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return e.Inputs.Unpack(data[4:])
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}
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var (
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errBadBool = errors.New("abi: improperly encoded boolean value")
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)
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// formatSliceString formats the reflection kind with the given slice size
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// and returns a formatted string representation.
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func formatSliceString(kind reflect.Kind, sliceSize int) string {
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if sliceSize == -1 {
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return fmt.Sprintf("[]%v", kind)
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}
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return fmt.Sprintf("[%d]%v", sliceSize, kind)
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}
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// sliceTypeCheck checks that the given slice can by assigned to the reflection
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// type in t.
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func sliceTypeCheck(t Type, val reflect.Value) error {
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if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
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return typeErr(formatSliceString(t.GetType().Kind(), t.Size), val.Type())
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}
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if t.T == ArrayTy && val.Len() != t.Size {
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return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len()))
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}
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if t.Elem.T == SliceTy || t.Elem.T == ArrayTy {
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if val.Len() > 0 {
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return sliceTypeCheck(*t.Elem, val.Index(0))
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}
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}
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if val.Type().Elem().Kind() != t.Elem.GetType().Kind() {
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return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type())
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}
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return nil
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}
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// typeCheck checks that the given reflection value can be assigned to the reflection
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// type in t.
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func typeCheck(t Type, value reflect.Value) error {
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if t.T == SliceTy || t.T == ArrayTy {
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return sliceTypeCheck(t, value)
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}
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// Check base type validity. Element types will be checked later on.
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if t.GetType().Kind() != value.Kind() {
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return typeErr(t.GetType().Kind(), value.Kind())
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} else if t.T == FixedBytesTy && t.Size != value.Len() {
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return typeErr(t.GetType(), value.Type())
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} else {
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return nil
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}
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}
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// typeErr returns a formatted type casting error.
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func typeErr(expected, got interface{}) error {
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return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected)
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}
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