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: kline_service.go
    path of file: ./repos/go-binance/v2/options
    
    the code of the file until where you have to start completion: package options

import (
	"context"
	"fmt"
	"net/http"
)

// KlinesService list klines
type KlinesService struct {
	c         *Client
	symbol    string
	interval  string
	limit     *int
	startTime *int64
	endTime   *int64
}

// Symbol set symbol
func (s *KlinesService) Symbol(symbol string) *KlinesService {
	s.symbol = symbol
	return s
}

// Interval set interval
func (s *KlinesService) Interval(interval string) *KlinesService {
	s.interval = interval
	return s
}

// Limit set limit
func (s *KlinesService) Limit(lim
    
func (s *KlinesService) Do(ctx context.Context, opts ...RequestOption) (res []*Kline, err error) {
	r := &request{
		method:   http.MethodGet,
		endpoint: "/eapi/v1/klines",
	}
	r.setParam("symbol", s.symbol)
	r.setParam("interval", s.interval)
	if s.limit != nil {
		r.setParam("limit", *s.limit)
	}
	if s.startTime != nil {
		r.setParam("startTime", *s.startTime)
	}
	if s.endTime != nil {
		r.setParam("endTime", *s.endTime)
	}
	data, _, err := s.c.callAPI(ctx, r, opts...)
	if err != nil {
		return []*Kline{}, err
	}
	j, err := newJSON(data)
	if err != nil {
		return []*Kline{}, err
	}
	num := len(j.MustArray())
	res = make([]*Kline, num)
	for i := 0; i < num; i++ {
		item := j.GetIndex(i)
		if len(item.MustMap()) < 12 {
			err = fmt.Errorf("invalid kline response")
			return []*Kline{}, err
		}
		res[i] = &Kline{
			OpenTime:    item.Get("openTime").MustInt64(),
			Open:        item.Get("open").MustString(),
			High:        item.Get("high").MustString(),
			Low:         item.Get("low").MustString(),
			Close:       item.Get("close").MustString(),
			CloseTime:   item.Get("closeTime").MustInt64(),
			Amount:      item.Get("amount").MustString(),
			TakerAmount: item.Get("takerAmount").MustString(),
			Volume:      item.Get("volume").MustString(),
			TakerVolume: item.Get("takerVolume").MustString(),
			Interval:    item.Get("interval").MustString(),
			TradeCount:  item.Get("tradeCount").MustInt64(),
		}
	}
	return res, nil
}