forked from cerc-io/plugeth
78 lines
2.6 KiB
Go
78 lines
2.6 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 (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
)
|
|
|
|
// Method represents a callable given a `Name` and whether the method is a constant.
|
|
// If the method is `Const` no transaction needs to be created for this
|
|
// particular Method call. It can easily be simulated using a local VM.
|
|
// For example a `Balance()` method only needs to retrieve something
|
|
// from the storage and therefor requires no Tx to be send to the
|
|
// network. A method such as `Transact` does require a Tx and thus will
|
|
// be flagged `true`.
|
|
// Input specifies the required input parameters for this gives method.
|
|
type Method struct {
|
|
Name string
|
|
Const bool
|
|
Inputs Arguments
|
|
Outputs Arguments
|
|
}
|
|
|
|
// Sig returns the methods string signature according to the ABI spec.
|
|
//
|
|
// Example
|
|
//
|
|
// function foo(uint32 a, int b) = "foo(uint32,int256)"
|
|
//
|
|
// Please note that "int" is substitute for its canonical representation "int256"
|
|
func (method Method) Sig() string {
|
|
types := make([]string, len(method.Inputs))
|
|
for i, input := range method.Inputs {
|
|
types[i] = input.Type.String()
|
|
}
|
|
return fmt.Sprintf("%v(%v)", method.Name, strings.Join(types, ","))
|
|
}
|
|
|
|
func (method Method) String() string {
|
|
inputs := make([]string, len(method.Inputs))
|
|
for i, input := range method.Inputs {
|
|
inputs[i] = fmt.Sprintf("%v %v", input.Type, input.Name)
|
|
}
|
|
outputs := make([]string, len(method.Outputs))
|
|
for i, output := range method.Outputs {
|
|
outputs[i] = output.Type.String()
|
|
if len(output.Name) > 0 {
|
|
outputs[i] += fmt.Sprintf(" %v", output.Name)
|
|
}
|
|
}
|
|
constant := ""
|
|
if method.Const {
|
|
constant = "constant "
|
|
}
|
|
return fmt.Sprintf("function %v(%v) %sreturns(%v)", method.Name, strings.Join(inputs, ", "), constant, strings.Join(outputs, ", "))
|
|
}
|
|
|
|
func (method Method) Id() []byte {
|
|
return crypto.Keccak256([]byte(method.Sig()))[:4]
|
|
}
|