mirror of https://github.com/ethereum/go-ethereum
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
329 lines
9.9 KiB
329 lines
9.9 KiB
// 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 bind generates Ethereum contract Go bindings.
|
|
//
|
|
// Detailed usage document and tutorial available on the go-ethereum Wiki page:
|
|
// https://github.com/ethereum/go-ethereum/wiki/Native-DApps:-Go-bindings-to-Ethereum-contracts
|
|
package bind
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"regexp"
|
|
"strings"
|
|
"text/template"
|
|
"unicode"
|
|
|
|
"github.com/ethereum/go-ethereum/accounts/abi"
|
|
"golang.org/x/tools/imports"
|
|
)
|
|
|
|
// Lang is a target programming language selector to generate bindings for.
|
|
type Lang int
|
|
|
|
const (
|
|
LangGo Lang = iota
|
|
LangJava
|
|
LangObjC
|
|
)
|
|
|
|
// Bind generates a Go wrapper around a contract ABI. This wrapper isn't meant
|
|
// to be used as is in client code, but rather as an intermediate struct which
|
|
// enforces compile time type safety and naming convention opposed to having to
|
|
// manually maintain hard coded strings that break on runtime.
|
|
func Bind(types []string, abis []string, bytecodes []string, pkg string, lang Lang) (string, error) {
|
|
// Process each individual contract requested binding
|
|
contracts := make(map[string]*tmplContract)
|
|
|
|
for i := 0; i < len(types); i++ {
|
|
// Parse the actual ABI to generate the binding for
|
|
evmABI, err := abi.JSON(strings.NewReader(abis[i]))
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
// Strip any whitespace from the JSON ABI
|
|
strippedABI := strings.Map(func(r rune) rune {
|
|
if unicode.IsSpace(r) {
|
|
return -1
|
|
}
|
|
return r
|
|
}, abis[i])
|
|
|
|
// Extract the call and transact methods, and sort them alphabetically
|
|
var (
|
|
calls = make(map[string]*tmplMethod)
|
|
transacts = make(map[string]*tmplMethod)
|
|
)
|
|
for _, original := range evmABI.Methods {
|
|
// Normalize the method for capital cases and non-anonymous inputs/outputs
|
|
normalized := original
|
|
normalized.Name = methodNormalizer[lang](original.Name)
|
|
|
|
normalized.Inputs = make([]abi.Argument, len(original.Inputs))
|
|
copy(normalized.Inputs, original.Inputs)
|
|
for j, input := range normalized.Inputs {
|
|
if input.Name == "" {
|
|
normalized.Inputs[j].Name = fmt.Sprintf("arg%d", j)
|
|
}
|
|
}
|
|
normalized.Outputs = make([]abi.Argument, len(original.Outputs))
|
|
copy(normalized.Outputs, original.Outputs)
|
|
for j, output := range normalized.Outputs {
|
|
if output.Name != "" {
|
|
normalized.Outputs[j].Name = capitalise(output.Name)
|
|
}
|
|
}
|
|
// Append the methods to the call or transact lists
|
|
if original.Const {
|
|
calls[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original)}
|
|
} else {
|
|
transacts[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original)}
|
|
}
|
|
}
|
|
contracts[types[i]] = &tmplContract{
|
|
Type: capitalise(types[i]),
|
|
InputABI: strings.Replace(strippedABI, "\"", "\\\"", -1),
|
|
InputBin: strings.TrimSpace(bytecodes[i]),
|
|
Constructor: evmABI.Constructor,
|
|
Calls: calls,
|
|
Transacts: transacts,
|
|
}
|
|
}
|
|
// Generate the contract template data content and render it
|
|
data := &tmplData{
|
|
Package: pkg,
|
|
Contracts: contracts,
|
|
}
|
|
buffer := new(bytes.Buffer)
|
|
|
|
funcs := map[string]interface{}{
|
|
"bindtype": bindType[lang],
|
|
"namedtype": namedType[lang],
|
|
"capitalise": capitalise,
|
|
"decapitalise": decapitalise,
|
|
}
|
|
tmpl := template.Must(template.New("").Funcs(funcs).Parse(tmplSource[lang]))
|
|
if err := tmpl.Execute(buffer, data); err != nil {
|
|
return "", err
|
|
}
|
|
// For Go bindings pass the code through goimports to clean it up and double check
|
|
if lang == LangGo {
|
|
code, err := imports.Process("", buffer.Bytes(), nil)
|
|
if err != nil {
|
|
return "", fmt.Errorf("%v\n%s", err, buffer)
|
|
}
|
|
return string(code), nil
|
|
}
|
|
// For all others just return as is for now
|
|
return string(buffer.Bytes()), nil
|
|
}
|
|
|
|
// bindType is a set of type binders that convert Solidity types to some supported
|
|
// programming language.
|
|
var bindType = map[Lang]func(kind abi.Type) string{
|
|
LangGo: bindTypeGo,
|
|
LangJava: bindTypeJava,
|
|
}
|
|
|
|
// bindTypeGo converts a Solidity type to a Go one. Since there is no clear mapping
|
|
// from all Solidity types to Go ones (e.g. uint17), those that cannot be exactly
|
|
// mapped will use an upscaled type (e.g. *big.Int).
|
|
func bindTypeGo(kind abi.Type) string {
|
|
stringKind := kind.String()
|
|
|
|
switch {
|
|
case strings.HasPrefix(stringKind, "address"):
|
|
parts := regexp.MustCompile("address(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
|
|
if len(parts) != 2 {
|
|
return stringKind
|
|
}
|
|
return fmt.Sprintf("%scommon.Address", parts[1])
|
|
|
|
case strings.HasPrefix(stringKind, "bytes"):
|
|
parts := regexp.MustCompile("bytes([0-9]*)(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
|
|
if len(parts) != 3 {
|
|
return stringKind
|
|
}
|
|
return fmt.Sprintf("%s[%s]byte", parts[2], parts[1])
|
|
|
|
case strings.HasPrefix(stringKind, "int") || strings.HasPrefix(stringKind, "uint"):
|
|
parts := regexp.MustCompile("(u)?int([0-9]*)(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
|
|
if len(parts) != 4 {
|
|
return stringKind
|
|
}
|
|
switch parts[2] {
|
|
case "8", "16", "32", "64":
|
|
return fmt.Sprintf("%s%sint%s", parts[3], parts[1], parts[2])
|
|
}
|
|
return fmt.Sprintf("%s*big.Int", parts[3])
|
|
|
|
case strings.HasPrefix(stringKind, "bool") || strings.HasPrefix(stringKind, "string"):
|
|
parts := regexp.MustCompile("([a-z]+)(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
|
|
if len(parts) != 3 {
|
|
return stringKind
|
|
}
|
|
return fmt.Sprintf("%s%s", parts[2], parts[1])
|
|
|
|
default:
|
|
return stringKind
|
|
}
|
|
}
|
|
|
|
// bindTypeJava converts a Solidity type to a Java one. Since there is no clear mapping
|
|
// from all Solidity types to Java ones (e.g. uint17), those that cannot be exactly
|
|
// mapped will use an upscaled type (e.g. BigDecimal).
|
|
func bindTypeJava(kind abi.Type) string {
|
|
stringKind := kind.String()
|
|
|
|
switch {
|
|
case strings.HasPrefix(stringKind, "address"):
|
|
parts := regexp.MustCompile("address(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
|
|
if len(parts) != 2 {
|
|
return stringKind
|
|
}
|
|
if parts[1] == "" {
|
|
return fmt.Sprintf("Address")
|
|
}
|
|
return fmt.Sprintf("Addresses")
|
|
|
|
case strings.HasPrefix(stringKind, "bytes"):
|
|
parts := regexp.MustCompile("bytes([0-9]*)(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
|
|
if len(parts) != 3 {
|
|
return stringKind
|
|
}
|
|
if parts[2] != "" {
|
|
return "byte[][]"
|
|
}
|
|
return "byte[]"
|
|
|
|
case strings.HasPrefix(stringKind, "int") || strings.HasPrefix(stringKind, "uint"):
|
|
parts := regexp.MustCompile("(u)?int([0-9]*)(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
|
|
if len(parts) != 4 {
|
|
return stringKind
|
|
}
|
|
switch parts[2] {
|
|
case "8", "16", "32", "64":
|
|
if parts[1] == "" {
|
|
if parts[3] == "" {
|
|
return fmt.Sprintf("int%s", parts[2])
|
|
}
|
|
return fmt.Sprintf("int%s[]", parts[2])
|
|
}
|
|
}
|
|
if parts[3] == "" {
|
|
return fmt.Sprintf("BigInt")
|
|
}
|
|
return fmt.Sprintf("BigInts")
|
|
|
|
case strings.HasPrefix(stringKind, "bool"):
|
|
parts := regexp.MustCompile("bool(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
|
|
if len(parts) != 2 {
|
|
return stringKind
|
|
}
|
|
if parts[1] == "" {
|
|
return fmt.Sprintf("bool")
|
|
}
|
|
return fmt.Sprintf("bool[]")
|
|
|
|
case strings.HasPrefix(stringKind, "string"):
|
|
parts := regexp.MustCompile("string(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
|
|
if len(parts) != 2 {
|
|
return stringKind
|
|
}
|
|
if parts[1] == "" {
|
|
return fmt.Sprintf("String")
|
|
}
|
|
return fmt.Sprintf("String[]")
|
|
|
|
default:
|
|
return stringKind
|
|
}
|
|
}
|
|
|
|
// namedType is a set of functions that transform language specific types to
|
|
// named versions that my be used inside method names.
|
|
var namedType = map[Lang]func(string, abi.Type) string{
|
|
LangGo: func(string, abi.Type) string { panic("this shouldn't be needed") },
|
|
LangJava: namedTypeJava,
|
|
}
|
|
|
|
// namedTypeJava converts some primitive data types to named variants that can
|
|
// be used as parts of method names.
|
|
func namedTypeJava(javaKind string, solKind abi.Type) string {
|
|
switch javaKind {
|
|
case "byte[]":
|
|
return "Binary"
|
|
case "byte[][]":
|
|
return "Binaries"
|
|
case "string":
|
|
return "String"
|
|
case "string[]":
|
|
return "Strings"
|
|
case "bool":
|
|
return "Bool"
|
|
case "bool[]":
|
|
return "Bools"
|
|
case "BigInt":
|
|
parts := regexp.MustCompile("(u)?int([0-9]*)(\\[[0-9]*\\])?").FindStringSubmatch(solKind.String())
|
|
if len(parts) != 4 {
|
|
return javaKind
|
|
}
|
|
switch parts[2] {
|
|
case "8", "16", "32", "64":
|
|
if parts[3] == "" {
|
|
return capitalise(fmt.Sprintf("%sint%s", parts[1], parts[2]))
|
|
}
|
|
return capitalise(fmt.Sprintf("%sint%ss", parts[1], parts[2]))
|
|
|
|
default:
|
|
return javaKind
|
|
}
|
|
default:
|
|
return javaKind
|
|
}
|
|
}
|
|
|
|
// methodNormalizer is a name transformer that modifies Solidity method names to
|
|
// conform to target language naming concentions.
|
|
var methodNormalizer = map[Lang]func(string) string{
|
|
LangGo: capitalise,
|
|
LangJava: decapitalise,
|
|
}
|
|
|
|
// capitalise makes the first character of a string upper case.
|
|
func capitalise(input string) string {
|
|
return strings.ToUpper(input[:1]) + input[1:]
|
|
}
|
|
|
|
// decapitalise makes the first character of a string lower case.
|
|
func decapitalise(input string) string {
|
|
return strings.ToLower(input[:1]) + input[1:]
|
|
}
|
|
|
|
// structured checks whether a method has enough information to return a proper
|
|
// Go struct ot if flat returns are needed.
|
|
func structured(method abi.Method) bool {
|
|
if len(method.Outputs) < 2 {
|
|
return false
|
|
}
|
|
for _, out := range method.Outputs {
|
|
if out.Name == "" {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|