You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: transport.go
    path of file: ./repos/learning_tools/go-kit/v3/v3_transport
    
    the code of the file until where you have to start completion: package v3_transport

import (
	"context"
	"encoding/json"
	"fmt"
	httptransport "github.com/g
    
func decodeHTTPADDRequest(ctx context.Context, r *http.Request) (interface{}, error) {
	var (
		in  v3_service.Add
		err error
	)
	in.A, err = strconv.Atoi(r.FormValue("a"))
	in.B, err = strconv.Atoi(r.FormValue("b"))
	if err != nil {
		return in, err
	}
	utils.GetLogger().Debug(fmt.Sprint(ctx.Value(v3_service.ContextReqUUid)), zap.Any(" 开始解析请求数据", in))
	return in, nil
}