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feature(abigen): support parse transaction input bytes readable go struct in abigen #27361

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feature(abigen): support parse transaction input bytes readable go struct in abigen #27361

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0806500
feat: support parse method input from input data of transaction in ab…
fenghaojiang May 26, 2023
7671704
Merge branch 'ethereum:master' into master
fenghaojiang May 26, 2023
197a4c8
fix: fix parse struct by using `abi.ConvertType`
fenghaojiang May 26, 2023
05847ed
Merge branch 'master' of github.com:fenghaojiang/go-ethereum
fenghaojiang May 26, 2023
99c4391
style: add space in front of error value
fenghaojiang May 26, 2023
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50 changes: 49 additions & 1 deletion accounts/abi/bind/template.go
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Original file line number Diff line number Diff line change
Expand Up @@ -87,9 +87,11 @@ const tmplSourceGo = `
package {{.Package}}

import (
"errors"
"fmt"
"math/big"
"reflect"
"strings"
"errors"

ethereum "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts/abi"
Expand Down Expand Up @@ -378,6 +380,52 @@ var (
}
{{end}}

{{$metaType := .Type}}
{{range .Transacts}}
{{if ne (len .Normalized.Inputs) 0}}

// {{.Normalized.Name}}Params is an auto generated read-only Go binding of transcaction calldata params
type {{.Normalized.Name}}Params struct {
{{range $i, $_ := .Normalized.Inputs}} Param_{{.Name}} {{bindtype .Type $structs}}
{{end}}
}

// Parse {{.Normalized.Name}} method from calldata of a transaction
//
// Solidity: {{.Original.String}}
func Parse{{.Normalized.Name}}(calldata []byte) (*{{.Normalized.Name}}Params, error) {
if len(calldata) <= 4 {
return nil, fmt.Errorf("invalid calldata input")
}

_abi, err := {{$metaType}}MetaData.GetAbi()
if err != nil {
return nil, fmt.Errorf("failed to get abi of registry metadata: %w", err)
}

out, err := _abi.Methods["{{.Original.Name}}"].Inputs.Unpack(calldata[4:])
if err != nil {
return nil, fmt.Errorf("failed to unpack {{.Original.Name}} params data: %w", err)
}

var paramsResult = new({{.Normalized.Name}}Params)
value := reflect.ValueOf(paramsResult).Elem()

if value.NumField() != len(out) {
return nil, fmt.Errorf("failed to match calldata with param field number")
}

{{range $i, $t := .Normalized.Inputs}}
out{{$i}} := *abi.ConvertType(out[{{$i}}], new({{bindtype .Type $structs}})).(*{{bindtype .Type $structs}}){{end}}

return &{{.Normalized.Name}}Params{
{{range $i, $_ := .Normalized.Inputs}} Param_{{.Name}} : out{{$i}},{{end}}
}, nil
}

{{end}}
{{end}}

{{if .Fallback}}
// Fallback is a paid mutator transaction binding the contract fallback function.
//
Expand Down