77 lines
2.5 KiB
Go
77 lines
2.5 KiB
Go
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// Copyright 2015 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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"fmt"
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"strings"
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"github.com/ethereum/go-ethereum/crypto"
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)
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// Callable method given a `Name` and whether the method is a constant.
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// If the method is `Const` no transaction needs to be created for this
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// particular Method call. It can easily be simulated using a local VM.
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// For example a `Balance()` method only needs to retrieve something
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// from the storage and therefor requires no Tx to be send to the
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// network. A method such as `Transact` does require a Tx and thus will
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// be flagged `true`.
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// Input specifies the required input parameters for this gives method.
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type Method struct {
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Name string
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Const bool
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Inputs []Argument
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Outputs []Argument
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}
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// Sig returns the methods string signature according to the ABI spec.
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//
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// Example
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//
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// function foo(uint32 a, int b) = "foo(uint32,int256)"
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//
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// Please note that "int" is substitute for its canonical representation "int256"
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func (m Method) Sig() string {
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types := make([]string, len(m.Inputs))
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i := 0
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for _, input := range m.Inputs {
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types[i] = input.Type.String()
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i++
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}
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return fmt.Sprintf("%v(%v)", m.Name, strings.Join(types, ","))
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}
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func (m Method) String() string {
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inputs := make([]string, len(m.Inputs))
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for i, input := range m.Inputs {
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inputs[i] = fmt.Sprintf("%v %v", input.Name, input.Type)
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}
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outputs := make([]string, len(m.Outputs))
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for i, output := range m.Outputs {
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if len(output.Name) > 0 {
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outputs[i] = fmt.Sprintf("%v ", output.Name)
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}
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outputs[i] += output.Type.String()
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}
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return fmt.Sprintf("function %v(%v) returns(%v)", m.Name, strings.Join(inputs, ", "), strings.Join(outputs, ", "))
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}
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func (m Method) Id() []byte {
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return crypto.Sha3([]byte(m.Sig()))[:4]
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}
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