google_maps_image.rb

require 'net/http'

class GoogleMapsImage
  class << self
    attr_writer :api_key

    def get(lat, long, options = {})
      options = {width: 500, height: 500}.merge(options)
      key = [lat, long, options]

      return cache[key] if cache.has_key?(key)

      uri = URI("https://example.com/").tap do |u|
        u.query = URI.encode_www_form(
          width: options[:width],
          height: options[:height],
          api_key: @api_key
        )
      end

      resp = Net::HTTP.get_response(uri)

      if resp.is_a?(Net::HTTPSuccess)
        cache[key] = [resp.content_type, resp.body]
      end
    end

    private

    def cache
      @cache ||= {}
    end
  end
end