td-agentのin_execプラグインで読み取るためにuptimeをrubyで出力

uptime.rb

module Monitoring
	module Command
		class Uptime
			def exec
				parsed = parse_uptime

				# only over v2.4
				# puts parsed.named_captures.to_json

				# ~v2.3
				ret = {}
				parsed.names.each{|name| ret[name] = parsed[name]}
				# uptimeでは時間しか取得できないので日付も含めた値をセットする
				ret["time"] = now

				ret
			rescue => ex
				puts ex
			end

			private
				def uptime
					`uptime`.chomp
				end
				def uname
					`uname`.chomp
				end
				def now
					Time.now
				end
				def parse_uptime
					if uname === "Darwin"
						# for Mac
						mac_regexp.match(uptime)
					else
						# for Linux
						linux_regexp.match(uptime)
					end
				end
				def mac_regexp			
					/(?<users>\d*)\susers,\sload averages: (?<loadaverage_per_1_minutes>\d{1,}.\d{2})\s(?<loadaverage_per_5_minutes>\d{1,}.\d{2})\s(?<loadaverage_per_15_minutes>\d{1,}.\d{2})/
				end
				def linux_regexp
					/(?<users>\d*)\s(user|users),\s*load average: (?<loadaverage_per_1_minutes>\d{1,}.\d{2}),\s(?<loadaverage_per_5_minutes>\d{1,}.\d{2}),\s(?<loadaverage_per_15_minutes>\d{1,}.\d{2})/
				end
		end
	end
end


if $0 == __FILE__
	require "json"
	uptime = Monitoring::Command::Uptime.new().exec
	puts uptime.to_json
end

uptime_test.rb

require "test/unit"
require "./uptime"
require "json"
require "pp"


class UptimeTest < Test::Unit::TestCase
	
	def test_exec_darwin_1
		command = Monitoring::Command::Uptime.new
		command.define_singleton_method(:uname) do
			"Darwin"
		end
		command.define_singleton_method(:uptime) do
			" 8:02  up 3 days, 22:46, 4 users, load averages: 3.09 2.85 2.80"
		end
		
		ret = command.exec
		assert_equal "4", ret["users"]
		assert_equal "3.09", ret["loadaverage_per_1_minutes"]
		assert_equal "2.85", ret["loadaverage_per_5_minutes"]
		assert_equal "2.80", ret["loadaverage_per_15_minutes"]
	end

	def test_exec_linux_1
		command = Monitoring::Command::Uptime.new
		command.define_singleton_method(:uname) do
			"Linux"
		end
		command.define_singleton_method(:uptime) do
			" 22:44:59 up  7:18,  2 users,  load average: 0.57, 0.30, 0.17"
		end

		ret = command.exec
		assert_equal "2", ret["users"]
		assert_equal "0.57", ret["loadaverage_per_1_minutes"]
		assert_equal "0.30", ret["loadaverage_per_5_minutes"]
		assert_equal "0.17", ret["loadaverage_per_15_minutes"]
	end

	def test_exec_linux_2
		command = Monitoring::Command::Uptime.new
		command.define_singleton_method(:uname) do
			"Linux"
		end
		command.define_singleton_method(:uptime) do
			" 05:50:13 up 28 min,  2 users,  load average: 1.34, 1.46, 1.12"
		end

		ret = command.exec
		assert_equal "2", ret["users"]
		assert_equal "1.34", ret["loadaverage_per_1_minutes"]
		assert_equal "1.46", ret["loadaverage_per_5_minutes"]
		assert_equal "1.12", ret["loadaverage_per_15_minutes"]
	end

	def test_exec_linux_3
		command = Monitoring::Command::Uptime.new
		command.define_singleton_method(:uname) do
			"Linux"
		end
		command.define_singleton_method(:uptime) do
			" 11:02:16 up 68 days, 14:21,  1 user,  load average: 0.02, 0.02, 0.00"
		end

		ret = command.exec
		assert_equal "1", ret["users"]
		assert_equal "0.02", ret["loadaverage_per_1_minutes"]
		assert_equal "0.02", ret["loadaverage_per_5_minutes"]
		assert_equal "0.00", ret["loadaverage_per_15_minutes"]
	end
end

uptime.rbではloadaverageの値がStringとなってしまうので、templateを作成してfloatに変更する必要がある.

tempalte-uptime-*

{
  "template": "uptime-*",
  "mappings": {
     "uptime":{
      "properties":{
        "loadaverage_per_1_minutes":{
          "type":"float"
        },
        "loadaverage_per_5_minutes":{
          "type":"float"
        },
        "loadaverage_per_15_minutes":{
          "type":"float"
        }
      }
    }
  }
}