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accounts/abi/bind: parse ABI only once, create metadata struct (#22583)

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This commit is contained in:
Marius van der Wijden 2021-07-27 16:22:21 +02:00 committed by GitHub
parent 5c89ec9b98
commit b20bc5c0ca
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 53 additions and 10 deletions
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25
accounts/abi/bind/base.go
View File

@ -21,6 +21,8 @@ import (
"errors"
"fmt"
"math/big"
"strings"
"sync"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts/abi"
@ -76,6 +78,29 @@ type WatchOpts struct {
Context context.Context // Network context to support cancellation and timeouts (nil = no timeout)
}
// MetaData collects all metadata for a bound contract.
type MetaData struct {
mu sync.Mutex
Sigs map[string]string
Bin string
ABI string
ab *abi.ABI
}
func (m *MetaData) GetAbi() (*abi.ABI, error) {
m.mu.Lock()
defer m.mu.Unlock()
if m.ab != nil {
return m.ab, nil
}
if parsed, err := abi.JSON(strings.NewReader(m.ABI)); err != nil {
return nil, err
} else {
m.ab = &parsed
}
return m.ab, nil
}
// BoundContract is the base wrapper object that reflects a contract on the
// Ethereum network. It contains a collection of methods that are used by the
// higher level contract bindings to operate.

38
accounts/abi/bind/template.go
View File

@ -90,6 +90,7 @@ package {{.Package}}
import (
"math/big"
"strings"
"errors"
ethereum "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts/abi"
@ -101,6 +102,7 @@ import (
// Reference imports to suppress errors if they are not otherwise used.
var (
_ = errors.New
_ = big.NewInt
_ = strings.NewReader
_ = ethereum.NotFound
@ -120,32 +122,48 @@ var (
{{end}}
{{range $contract := .Contracts}}
// {{.Type}}ABI is the input ABI used to generate the binding from.
const {{.Type}}ABI = "{{.InputABI}}"
{{if $contract.FuncSigs}}
// {{.Type}}FuncSigs maps the 4-byte function signature to its string representation.
var {{.Type}}FuncSigs = map[string]string{
// {{.Type}}MetaData contains all meta data concerning the {{.Type}} contract.
var {{.Type}}MetaData = &bind.MetaData{
ABI: "{{.InputABI}}",
{{if $contract.FuncSigs -}}
Sigs: map[string]string{
{{range $strsig, $binsig := .FuncSigs}}"{{$binsig}}": "{{$strsig}}",
{{end}}
}
},
{{end -}}
{{if .InputBin -}}
Bin: "0x{{.InputBin}}",
{{end}}
}
// {{.Type}}ABI is the input ABI used to generate the binding from.
// Deprecated: Use {{.Type}}MetaData.ABI instead.
var {{.Type}}ABI = {{.Type}}MetaData.ABI
{{if $contract.FuncSigs}}
// Deprecated: Use {{.Type}}MetaData.Sigs instead.
// {{.Type}}FuncSigs maps the 4-byte function signature to its string representation.
var {{.Type}}FuncSigs = {{.Type}}MetaData.Sigs
{{end}}
{{if .InputBin}}
// {{.Type}}Bin is the compiled bytecode used for deploying new contracts.
var {{.Type}}Bin = "0x{{.InputBin}}"
// Deprecated: Use {{.Type}}MetaData.Bin instead.
var {{.Type}}Bin = {{.Type}}MetaData.Bin
// Deploy{{.Type}} deploys a new Ethereum contract, binding an instance of {{.Type}} to it.
func Deploy{{.Type}}(auth *bind.TransactOpts, backend bind.ContractBackend {{range .Constructor.Inputs}}, {{.Name}} {{bindtype .Type $structs}}{{end}}) (common.Address, *types.Transaction, *{{.Type}}, error) {
parsed, err := abi.JSON(strings.NewReader({{.Type}}ABI))
parsed, err := {{.Type}}MetaData.GetAbi()
if err != nil {
return common.Address{}, nil, nil, err
}
if parsed == nil {
return common.Address{}, nil, nil, errors.New("GetABI returned nil")
}
{{range $pattern, $name := .Libraries}}
{{decapitalise $name}}Addr, _, _, _ := Deploy{{capitalise $name}}(auth, backend)
{{$contract.Type}}Bin = strings.Replace({{$contract.Type}}Bin, "__${{$pattern}}$__", {{decapitalise $name}}Addr.String()[2:], -1)
{{end}}
address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex({{.Type}}Bin), backend {{range .Constructor.Inputs}}, {{.Name}}{{end}})
address, tx, contract, err := bind.DeployContract(auth, *parsed, common.FromHex({{.Type}}Bin), backend {{range .Constructor.Inputs}}, {{.Name}}{{end}})
if err != nil {
return common.Address{}, nil, nil, err
}