92 lines
2.6 KiB
Go
92 lines
2.6 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 (
|
|
"bytes"
|
|
"errors"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
)
|
|
|
|
type Error struct {
|
|
Name string
|
|
Inputs Arguments
|
|
str string
|
|
// Sig contains the string signature according to the ABI spec.
|
|
// e.g. event foo(uint32 a, int b) = "foo(uint32,int256)"
|
|
// Please note that "int" is substitute for its canonical representation "int256"
|
|
Sig string
|
|
// ID returns the canonical representation of the event's signature used by the
|
|
// abi definition to identify event names and types.
|
|
ID common.Hash
|
|
}
|
|
|
|
func NewError(name string, inputs Arguments) Error {
|
|
// sanitize inputs to remove inputs without names
|
|
// and precompute string and sig representation.
|
|
names := make([]string, len(inputs))
|
|
types := make([]string, len(inputs))
|
|
for i, input := range inputs {
|
|
if input.Name == "" {
|
|
inputs[i] = Argument{
|
|
Name: fmt.Sprintf("arg%d", i),
|
|
Indexed: input.Indexed,
|
|
Type: input.Type,
|
|
}
|
|
} else {
|
|
inputs[i] = input
|
|
}
|
|
// string representation
|
|
names[i] = fmt.Sprintf("%v %v", input.Type, inputs[i].Name)
|
|
if input.Indexed {
|
|
names[i] = fmt.Sprintf("%v indexed %v", input.Type, inputs[i].Name)
|
|
}
|
|
// sig representation
|
|
types[i] = input.Type.String()
|
|
}
|
|
|
|
str := fmt.Sprintf("error %v(%v)", name, strings.Join(names, ", "))
|
|
sig := fmt.Sprintf("%v(%v)", name, strings.Join(types, ","))
|
|
id := common.BytesToHash(crypto.Keccak256([]byte(sig)))
|
|
|
|
return Error{
|
|
Name: name,
|
|
Inputs: inputs,
|
|
str: str,
|
|
Sig: sig,
|
|
ID: id,
|
|
}
|
|
}
|
|
|
|
func (e *Error) String() string {
|
|
return e.str
|
|
}
|
|
|
|
func (e *Error) Unpack(data []byte) (interface{}, error) {
|
|
if len(data) < 4 {
|
|
return "", errors.New("invalid data for unpacking")
|
|
}
|
|
if !bytes.Equal(data[:4], e.ID[:4]) {
|
|
return "", errors.New("invalid data for unpacking")
|
|
}
|
|
return e.Inputs.Unpack(data[4:])
|
|
}
|