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

accounts/abi/bind/template.go

@@ -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"
@@ -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.
 		//