module HttpUtils

  # result = http_get("https://www.okcoin.cn/api/v1/trades.do", { symbol: 'btc_usd', since: nil })
  def http_get(url, params={})
    uri = URI(url)
    uri.query = URI.encode_www_form(params)
    logger.debug( 'GET: ' + (uri.query.blank? ? url : "#{url}?#{uri.query}") )

    response = Net::HTTP.start(uri.host, uri.port, :use_ssl => true) do |http|
      request = Net::HTTP::Get.new uri
      http.request request
    end

    if response.is_a?(Net::HTTPOK)
      JSON.parse(response.body)
    else
      logger.error('response code is not 200!')
      nil # todo: 报个异常
    end
  end

  def http_post(url, params={})
    uri = URI(url)
    logger.debug( "POST: #{url}?#{URI.encode_www_form(params)}" )
    response = Net::HTTP.start(uri.hostname, uri.port, :use_ssl => true) do |http|
        request = Net::HTTP::Post.new(uri)
        request.set_form_data(params)
        http.request request
    end

    if response.is_a?(Net::HTTPOK)
      JSON.parse(response.body)
    else
      logger.error('response code is not 200!')
      nil # todo: 报个异常
    end
  end
end