forked from cerc-io/plugeth
ac3418def6
This adds logic to prepend 'M' or 'E' to Solidity identifiers when they would otherwise violate Go identifier naming rules. Closes #26972 --------- Co-authored-by: Martin Holst Swende <martin@swende.se> Co-authored-by: Sina Mahmoodi <itz.s1na@gmail.com>
497 lines
16 KiB
Go
497 lines
16 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 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"
|
|
"go/format"
|
|
"regexp"
|
|
"strings"
|
|
"text/template"
|
|
"unicode"
|
|
|
|
"github.com/ethereum/go-ethereum/accounts/abi"
|
|
"github.com/ethereum/go-ethereum/log"
|
|
)
|
|
|
|
// Lang is a target programming language selector to generate bindings for.
|
|
type Lang int
|
|
|
|
const (
|
|
LangGo Lang = iota
|
|
)
|
|
|
|
func isKeyWord(arg string) bool {
|
|
switch arg {
|
|
case "break":
|
|
case "case":
|
|
case "chan":
|
|
case "const":
|
|
case "continue":
|
|
case "default":
|
|
case "defer":
|
|
case "else":
|
|
case "fallthrough":
|
|
case "for":
|
|
case "func":
|
|
case "go":
|
|
case "goto":
|
|
case "if":
|
|
case "import":
|
|
case "interface":
|
|
case "iota":
|
|
case "map":
|
|
case "make":
|
|
case "new":
|
|
case "package":
|
|
case "range":
|
|
case "return":
|
|
case "select":
|
|
case "struct":
|
|
case "switch":
|
|
case "type":
|
|
case "var":
|
|
default:
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// 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, fsigs []map[string]string, pkg string, lang Lang, libs map[string]string, aliases map[string]string) (string, error) {
|
|
var (
|
|
// contracts is the map of each individual contract requested binding
|
|
contracts = make(map[string]*tmplContract)
|
|
|
|
// structs is the map of all redeclared structs shared by passed contracts.
|
|
structs = make(map[string]*tmplStruct)
|
|
|
|
// isLib is the map used to flag each encountered library as such
|
|
isLib = make(map[string]struct{})
|
|
)
|
|
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; events, struct definitions; and sort them alphabetically
|
|
var (
|
|
calls = make(map[string]*tmplMethod)
|
|
transacts = make(map[string]*tmplMethod)
|
|
events = make(map[string]*tmplEvent)
|
|
fallback *tmplMethod
|
|
receive *tmplMethod
|
|
|
|
// identifiers are used to detect duplicated identifiers of functions
|
|
// and events. For all calls, transacts and events, abigen will generate
|
|
// corresponding bindings. However we have to ensure there is no
|
|
// identifier collisions in the bindings of these categories.
|
|
callIdentifiers = make(map[string]bool)
|
|
transactIdentifiers = make(map[string]bool)
|
|
eventIdentifiers = make(map[string]bool)
|
|
)
|
|
|
|
for _, input := range evmABI.Constructor.Inputs {
|
|
if hasStruct(input.Type) {
|
|
bindStructType[lang](input.Type, structs)
|
|
}
|
|
}
|
|
|
|
for _, original := range evmABI.Methods {
|
|
// Normalize the method for capital cases and non-anonymous inputs/outputs
|
|
normalized := original
|
|
normalizedName := methodNormalizer[lang](alias(aliases, original.Name))
|
|
// Ensure there is no duplicated identifier
|
|
var identifiers = callIdentifiers
|
|
if !original.IsConstant() {
|
|
identifiers = transactIdentifiers
|
|
}
|
|
// Name shouldn't start with a digit. It will make the generated code invalid.
|
|
if len(normalizedName) > 0 && unicode.IsDigit(rune(normalizedName[0])) {
|
|
normalizedName = fmt.Sprintf("M%s", normalizedName)
|
|
normalizedName = abi.ResolveNameConflict(normalizedName, func(name string) bool {
|
|
_, ok := identifiers[name]
|
|
return ok
|
|
})
|
|
}
|
|
if identifiers[normalizedName] {
|
|
return "", fmt.Errorf("duplicated identifier \"%s\"(normalized \"%s\"), use --alias for renaming", original.Name, normalizedName)
|
|
}
|
|
identifiers[normalizedName] = true
|
|
|
|
normalized.Name = normalizedName
|
|
normalized.Inputs = make([]abi.Argument, len(original.Inputs))
|
|
copy(normalized.Inputs, original.Inputs)
|
|
for j, input := range normalized.Inputs {
|
|
if input.Name == "" || isKeyWord(input.Name) {
|
|
normalized.Inputs[j].Name = fmt.Sprintf("arg%d", j)
|
|
}
|
|
if hasStruct(input.Type) {
|
|
bindStructType[lang](input.Type, structs)
|
|
}
|
|
}
|
|
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)
|
|
}
|
|
if hasStruct(output.Type) {
|
|
bindStructType[lang](output.Type, structs)
|
|
}
|
|
}
|
|
// Append the methods to the call or transact lists
|
|
if original.IsConstant() {
|
|
calls[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original.Outputs)}
|
|
} else {
|
|
transacts[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original.Outputs)}
|
|
}
|
|
}
|
|
for _, original := range evmABI.Events {
|
|
// Skip anonymous events as they don't support explicit filtering
|
|
if original.Anonymous {
|
|
continue
|
|
}
|
|
// Normalize the event for capital cases and non-anonymous outputs
|
|
normalized := original
|
|
|
|
// Ensure there is no duplicated identifier
|
|
normalizedName := methodNormalizer[lang](alias(aliases, original.Name))
|
|
// Name shouldn't start with a digit. It will make the generated code invalid.
|
|
if len(normalizedName) > 0 && unicode.IsDigit(rune(normalizedName[0])) {
|
|
normalizedName = fmt.Sprintf("E%s", normalizedName)
|
|
normalizedName = abi.ResolveNameConflict(normalizedName, func(name string) bool {
|
|
_, ok := eventIdentifiers[name]
|
|
return ok
|
|
})
|
|
}
|
|
if eventIdentifiers[normalizedName] {
|
|
return "", fmt.Errorf("duplicated identifier \"%s\"(normalized \"%s\"), use --alias for renaming", original.Name, normalizedName)
|
|
}
|
|
eventIdentifiers[normalizedName] = true
|
|
normalized.Name = normalizedName
|
|
|
|
used := make(map[string]bool)
|
|
normalized.Inputs = make([]abi.Argument, len(original.Inputs))
|
|
copy(normalized.Inputs, original.Inputs)
|
|
for j, input := range normalized.Inputs {
|
|
if input.Name == "" || isKeyWord(input.Name) {
|
|
normalized.Inputs[j].Name = fmt.Sprintf("arg%d", j)
|
|
}
|
|
// Event is a bit special, we need to define event struct in binding,
|
|
// ensure there is no camel-case-style name conflict.
|
|
for index := 0; ; index++ {
|
|
if !used[capitalise(normalized.Inputs[j].Name)] {
|
|
used[capitalise(normalized.Inputs[j].Name)] = true
|
|
break
|
|
}
|
|
normalized.Inputs[j].Name = fmt.Sprintf("%s%d", normalized.Inputs[j].Name, index)
|
|
}
|
|
if hasStruct(input.Type) {
|
|
bindStructType[lang](input.Type, structs)
|
|
}
|
|
}
|
|
// Append the event to the accumulator list
|
|
events[original.Name] = &tmplEvent{Original: original, Normalized: normalized}
|
|
}
|
|
// Add two special fallback functions if they exist
|
|
if evmABI.HasFallback() {
|
|
fallback = &tmplMethod{Original: evmABI.Fallback}
|
|
}
|
|
if evmABI.HasReceive() {
|
|
receive = &tmplMethod{Original: evmABI.Receive}
|
|
}
|
|
contracts[types[i]] = &tmplContract{
|
|
Type: capitalise(types[i]),
|
|
InputABI: strings.ReplaceAll(strippedABI, "\"", "\\\""),
|
|
InputBin: strings.TrimPrefix(strings.TrimSpace(bytecodes[i]), "0x"),
|
|
Constructor: evmABI.Constructor,
|
|
Calls: calls,
|
|
Transacts: transacts,
|
|
Fallback: fallback,
|
|
Receive: receive,
|
|
Events: events,
|
|
Libraries: make(map[string]string),
|
|
}
|
|
// Function 4-byte signatures are stored in the same sequence
|
|
// as types, if available.
|
|
if len(fsigs) > i {
|
|
contracts[types[i]].FuncSigs = fsigs[i]
|
|
}
|
|
// Parse library references.
|
|
for pattern, name := range libs {
|
|
matched, err := regexp.Match("__\\$"+pattern+"\\$__", []byte(contracts[types[i]].InputBin))
|
|
if err != nil {
|
|
log.Error("Could not search for pattern", "pattern", pattern, "contract", contracts[types[i]], "err", err)
|
|
}
|
|
if matched {
|
|
contracts[types[i]].Libraries[pattern] = name
|
|
// keep track that this type is a library
|
|
if _, ok := isLib[name]; !ok {
|
|
isLib[name] = struct{}{}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Check if that type has already been identified as a library
|
|
for i := 0; i < len(types); i++ {
|
|
_, ok := isLib[types[i]]
|
|
contracts[types[i]].Library = ok
|
|
}
|
|
// Generate the contract template data content and render it
|
|
data := &tmplData{
|
|
Package: pkg,
|
|
Contracts: contracts,
|
|
Libraries: libs,
|
|
Structs: structs,
|
|
}
|
|
buffer := new(bytes.Buffer)
|
|
|
|
funcs := map[string]interface{}{
|
|
"bindtype": bindType[lang],
|
|
"bindtopictype": bindTopicType[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 gofmt to clean it up
|
|
if lang == LangGo {
|
|
code, err := format.Source(buffer.Bytes())
|
|
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 buffer.String(), nil
|
|
}
|
|
|
|
// bindType is a set of type binders that convert Solidity types to some supported
|
|
// programming language types.
|
|
var bindType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) string{
|
|
LangGo: bindTypeGo,
|
|
}
|
|
|
|
// bindBasicTypeGo converts basic solidity types(except array, slice and tuple) to Go ones.
|
|
func bindBasicTypeGo(kind abi.Type) string {
|
|
switch kind.T {
|
|
case abi.AddressTy:
|
|
return "common.Address"
|
|
case abi.IntTy, abi.UintTy:
|
|
parts := regexp.MustCompile(`(u)?int([0-9]*)`).FindStringSubmatch(kind.String())
|
|
switch parts[2] {
|
|
case "8", "16", "32", "64":
|
|
return fmt.Sprintf("%sint%s", parts[1], parts[2])
|
|
}
|
|
return "*big.Int"
|
|
case abi.FixedBytesTy:
|
|
return fmt.Sprintf("[%d]byte", kind.Size)
|
|
case abi.BytesTy:
|
|
return "[]byte"
|
|
case abi.FunctionTy:
|
|
return "[24]byte"
|
|
default:
|
|
// string, bool types
|
|
return kind.String()
|
|
}
|
|
}
|
|
|
|
// bindTypeGo converts solidity types to Go ones. 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. BigDecimal).
|
|
func bindTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
|
|
switch kind.T {
|
|
case abi.TupleTy:
|
|
return structs[kind.TupleRawName+kind.String()].Name
|
|
case abi.ArrayTy:
|
|
return fmt.Sprintf("[%d]", kind.Size) + bindTypeGo(*kind.Elem, structs)
|
|
case abi.SliceTy:
|
|
return "[]" + bindTypeGo(*kind.Elem, structs)
|
|
default:
|
|
return bindBasicTypeGo(kind)
|
|
}
|
|
}
|
|
|
|
// bindTopicType is a set of type binders that convert Solidity types to some
|
|
// supported programming language topic types.
|
|
var bindTopicType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) string{
|
|
LangGo: bindTopicTypeGo,
|
|
}
|
|
|
|
// bindTopicTypeGo converts a Solidity topic type to a Go one. It is almost the same
|
|
// functionality as for simple types, but dynamic types get converted to hashes.
|
|
func bindTopicTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
|
|
bound := bindTypeGo(kind, structs)
|
|
|
|
// todo(rjl493456442) according solidity documentation, indexed event
|
|
// parameters that are not value types i.e. arrays and structs are not
|
|
// stored directly but instead a keccak256-hash of an encoding is stored.
|
|
//
|
|
// We only convert stringS and bytes to hash, still need to deal with
|
|
// array(both fixed-size and dynamic-size) and struct.
|
|
if bound == "string" || bound == "[]byte" {
|
|
bound = "common.Hash"
|
|
}
|
|
return bound
|
|
}
|
|
|
|
// bindStructType is a set of type binders that convert Solidity tuple types to some supported
|
|
// programming language struct definition.
|
|
var bindStructType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) string{
|
|
LangGo: bindStructTypeGo,
|
|
}
|
|
|
|
// bindStructTypeGo converts a Solidity tuple type to a Go one and records the mapping
|
|
// in the given map.
|
|
// Notably, this function will resolve and record nested struct recursively.
|
|
func bindStructTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
|
|
switch kind.T {
|
|
case abi.TupleTy:
|
|
// We compose a raw struct name and a canonical parameter expression
|
|
// together here. The reason is before solidity v0.5.11, kind.TupleRawName
|
|
// is empty, so we use canonical parameter expression to distinguish
|
|
// different struct definition. From the consideration of backward
|
|
// compatibility, we concat these two together so that if kind.TupleRawName
|
|
// is not empty, it can have unique id.
|
|
id := kind.TupleRawName + kind.String()
|
|
if s, exist := structs[id]; exist {
|
|
return s.Name
|
|
}
|
|
var (
|
|
names = make(map[string]bool)
|
|
fields []*tmplField
|
|
)
|
|
for i, elem := range kind.TupleElems {
|
|
name := capitalise(kind.TupleRawNames[i])
|
|
name = abi.ResolveNameConflict(name, func(s string) bool { return names[s] })
|
|
names[name] = true
|
|
fields = append(fields, &tmplField{Type: bindStructTypeGo(*elem, structs), Name: name, SolKind: *elem})
|
|
}
|
|
name := kind.TupleRawName
|
|
if name == "" {
|
|
name = fmt.Sprintf("Struct%d", len(structs))
|
|
}
|
|
name = capitalise(name)
|
|
|
|
structs[id] = &tmplStruct{
|
|
Name: name,
|
|
Fields: fields,
|
|
}
|
|
return name
|
|
case abi.ArrayTy:
|
|
return fmt.Sprintf("[%d]", kind.Size) + bindStructTypeGo(*kind.Elem, structs)
|
|
case abi.SliceTy:
|
|
return "[]" + bindStructTypeGo(*kind.Elem, structs)
|
|
default:
|
|
return bindBasicTypeGo(kind)
|
|
}
|
|
}
|
|
|
|
// namedType is a set of functions that transform language specific types to
|
|
// named versions that may 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") },
|
|
}
|
|
|
|
// alias returns an alias of the given string based on the aliasing rules
|
|
// or returns itself if no rule is matched.
|
|
func alias(aliases map[string]string, n string) string {
|
|
if alias, exist := aliases[n]; exist {
|
|
return alias
|
|
}
|
|
return n
|
|
}
|
|
|
|
// methodNormalizer is a name transformer that modifies Solidity method names to
|
|
// conform to target language naming conventions.
|
|
var methodNormalizer = map[Lang]func(string) string{
|
|
LangGo: abi.ToCamelCase,
|
|
}
|
|
|
|
// capitalise makes a camel-case string which starts with an upper case character.
|
|
var capitalise = abi.ToCamelCase
|
|
|
|
// decapitalise makes a camel-case string which starts with a lower case character.
|
|
func decapitalise(input string) string {
|
|
if len(input) == 0 {
|
|
return input
|
|
}
|
|
|
|
goForm := abi.ToCamelCase(input)
|
|
return strings.ToLower(goForm[:1]) + goForm[1:]
|
|
}
|
|
|
|
// structured checks whether a list of ABI data types has enough information to
|
|
// operate through a proper Go struct or if flat returns are needed.
|
|
func structured(args abi.Arguments) bool {
|
|
if len(args) < 2 {
|
|
return false
|
|
}
|
|
exists := make(map[string]bool)
|
|
for _, out := range args {
|
|
// If the name is anonymous, we can't organize into a struct
|
|
if out.Name == "" {
|
|
return false
|
|
}
|
|
// If the field name is empty when normalized or collides (var, Var, _var, _Var),
|
|
// we can't organize into a struct
|
|
field := capitalise(out.Name)
|
|
if field == "" || exists[field] {
|
|
return false
|
|
}
|
|
exists[field] = true
|
|
}
|
|
return true
|
|
}
|
|
|
|
// hasStruct returns an indicator whether the given type is struct, struct slice
|
|
// or struct array.
|
|
func hasStruct(t abi.Type) bool {
|
|
switch t.T {
|
|
case abi.SliceTy:
|
|
return hasStruct(*t.Elem)
|
|
case abi.ArrayTy:
|
|
return hasStruct(*t.Elem)
|
|
case abi.TupleTy:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|