sky.rb

#!/usr/bin/env ruby

require 'aws-sdk'
require 'pry-byebug'

regions = [
  'us-west-2',      # Oregon
  'us-east-1',      # N Virginia
  'eu-west-1',      # Ireland
  'eu-central-1',   # Frankfurt
  'ap-northeast-1', # Tokyo
  'ap-northeast-2', # Seoul
  'ap-southeast-1', # Singapore
  'ap-southeast-2', # Sydney
  'ap-south-1',     # Mumbai
  'sa-east-1'       # Sao Paolo
]

def spot_price_data(spot_price_history)
  totals = spot_price_history.each_with_object({}) do |spot_price, totals|
    totals[spot_price.instance_type] ||= {num: 0, prices: []}

    totals[spot_price.instance_type][:num] += 1
    totals[spot_price.instance_type][:prices] << spot_price.spot_price.to_f
  end

  data = totals.map do |instance_type, info_hash|
    [
      instance_type,
      {
        avg: info_hash[:prices].inject(0, :+) / info_hash[:num],
        min: info_hash[:prices].min
      }
    ]
  end.to_h
end


instance_types = ["d2.8xlarge", "m4.8xlarge"]

all_data = regions.map do |region|
  client = Aws::EC2::Client.new(region: region)

  resp = client.describe_spot_price_history({
    start_time: Time.parse("2016-10-28"),
    # end_time: Time.parse("2016-10-29"),
    instance_types: instance_types,
    product_descriptions: [
      "Linux/UNIX (Amazon VPC)",
    ],
  })

  data = spot_price_data(resp.spot_price_history)

  {region => data}
end

puts all_data.to_json