add pricing_table.rb

pricing_table.rb

@@ -0,0 +1,103 @@
+#!/usr/bin/env ruby
+require 'net/http'
+require 'json'
+
+# http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/ec2/linux-od.js
+# http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/linux-od.js
+# http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/ec2/linux-ri-light.js
+# http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/ec2/linux-ri-medium.js
+# http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/ec2/linux-ri-heavy.js
+# http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/ec2/mswin-od.js
+# http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/ec2/mswin-ri-light.js
+# http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/ec2/mswin-ri-medium.js
+# http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/ec2/mswin-ri-heavy.js
+
+BASE_URL = 'http://aws-assets-pricing-prod.s3.amazonaws.com/pricing/ec2'
+
+def pricing_table(os, type)
+  type = type.to_s.gsub('_', '-')
+  url = "#{BASE_URL}/#{os}-#{type}.js"
+  url = URI.parse(url)
+  body = Net::HTTP.start(url.host, url.port) {|http| http.get(url.path).body }
+  JSON.parse(body.gsub(/\A\s*callback\s*\((.*)\)\s*;?\s*\Z/m) { $1 })
+end
+
+require 'pp'
+
+def ondemand_sheets(os)
+  buf = {}
+
+  pricing_table(os, :od)['config']['regions'].each do |region_h|
+    region = region_h['region']
+    instance_types = region_h['instanceTypes']
+
+    instance_types.each do |instance_type_h|
+      instance_type_h['sizes'].each do |size_h|
+        size = size_h['size']
+        buf[region] ||= {}
+        buf[region][size] = size_h['valueColumns'].first['prices']['USD'].to_f
+      end
+    end
+  end
+
+  return buf
+end
+
+def ondemand_sheets_js(varname, os)
+  buf = ondemand_sheets(os)
+  "var #{varname} = " + JSON.pretty_generate(buf).strip + ';'
+end
+
+def ri_sheets(os, weight)
+  buf = {}
+
+  pricing_table(:linux, "ri_#{weight}")['config']['regions'].each do |region_h|
+    region = region_h['region']
+    instance_types = region_h['instanceTypes']
+
+    instance_types.each do |instance_type_h|
+      instance_type_h['sizes'].each do |size_h|
+        size = size_h['size']
+        buf[region] ||= {}
+        buf[region][size] = []
+
+        size_h['valueColumns'].map do |value_columns_h|
+          buf[region][size] << value_columns_h['prices']['USD'].to_f
+        end
+
+        buf[region][size] = "%" + buf[region][size].inspect + "%"
+      end
+    end
+  end
+
+  return buf
+end
+
+def ri_sheets_js(varname, os, weight)
+  buf = ri_sheets(os, weight)
+  buf = JSON.pretty_generate(buf).strip
+  buf = buf.gsub(/"%(\[[^%]+\])%"/) { $1 }
+  JSON.parse(buf)
+  "var #{varname} = " + buf + ';'
+end
+
+puts <<-EOS
+// On-Demand Instances
+#{ondemand_sheets_js '__calcLinuxMonthlyAmount__rateSheets', :linux}
+
+#{ondemand_sheets_js '__calcWindowsMonthlyAmount__rateSheets', :mswin}
+
+EOS
+
+%w(Light Medium Heavy).each do |weight|
+  linux_varname = "__calc#{weight}RILinuxMonthlyAmount__rateSheets"
+  mswin_varname = "__calc#{weight}RIWindowsMonthlyAmount__rateSheets"
+
+  puts <<-EOS
+// Reserved Instances (#{weight})
+#{ri_sheets_js linux_varname, :linux, weight.downcase}
+
+#{ri_sheets_js mswin_varname, :mswin, weight.downcase}
+
+EOS
+end