Ruby module that generates a static jpg chart using the HighCharts servers

chart_statificator.rb

module ChartStatificator
  extend ActiveSupport::Concern

  # need test
  def generate_static_chart
    Rails.logger.debug ">>> static_chart for #{id} <<<"
    data = {
      'options': {series: chart.series_data, 
                  title: chart.options[:title], 
                  yAxis: {title: {text: nil}, labels:{}},
                  xAxis: {categories: chart.options[:xAxis][:categories], 
                          labels: {step: chart.options[:xAxis][:labels][:step]}},
                  plotOptions: chart.options[:plotOptions]
      },
      'type': 'image/png',
      'async': true
    }
    data[:options] = data[:options].to_json
    @static_chart = upload_chart(chart_export_file(data))
  end
  
  private

  def chart_export_file(data)
    require "net/http"
    require "uri"
    require 'open-uri'
    highcharts_export = nil
    x = Net::HTTP.post_form(URI.parse('http://export.highcharts.com'), data)
    Rails.logger.debug ">>> #{x.body} <<<<"
    retries = 1
    begin
      highcharts_export = open("http://export.highcharts.com/#{x.body}")
      raise 'hightcharts export no content' if highcharts_export.meta['content-length'].to_i == 0
    rescue => ex
      retries += 1
      Rails.logger.debug ">>> Exception: #{ex.inspect} <<<"
      if retries <= 5
        Rails.logger.debug ">>> Retrying in 2 seconds... take #{retries} <<<"
        sleep(2)
        retry
      else
        raise 'hichcharts export failed after all retries'
      end
    else
      Rails.logger.debug ">>> Successfully read <<<"
    end
    highcharts_export
  end

  def upload_chart(file)
    bucket = FOG_CONNECTION.directories.new(:key => ENV['AWS_BUCKET'])
    chart_in_s3 = bucket.files.create(
      key: "report-#{report.id}-widget-#{id}-#{title.parameterize}-#{Time.now.strftime("%Y%m%d%H%M%S")}.png",
      body: file.read,
      public: true
    )
    Rails.logger.info ">>> #{chart_in_s3.public_url} <<<"
    chart_in_s3.public_url.gsub('https://s3.amazonaws.com/', 'http://')
  end
end

@luctus what does ruby lint say about using single and double quotes?