#
#  The redis-alerter.
#
#  This doesn't raise/clear alerts in the traditional sense, instead
# it just saves the results in a "recent tests" set inside Redis.
#
#
module Custodian

  module Alerter

    class RedisAlert < AlertFactory

      #
      # The test this alerter cares about
      #
      attr_reader :test


      #
      # The redis-object
      #
      attr_reader :redis




      #
      # Constructor - save the test-object away & instantiate
      # the redis connection.
      #
      def initialize(obj)

        begin
          require 'rubygems'
          require 'redis'
          require 'json'

          @redis = Redis.new(:host => @target)

        rescue
          puts 'ERROR Loading redis rubygem!'
        end

        @test  = obj
      end



      #
      # Store an alert in redis
      #
      def raise

        return unless @redis

        tmp = {}
        tmp['time']   = Time.now.to_i
        tmp['type']   = @test.get_type
        tmp['target'] = @test.target
        tmp['result'] = 'RAISE'
        tmp['reason'] = @test.error
        tmp['test'  ] = @test.to_s
        tmp['class' ] = @test.class

        @redis.lpush('recent-tests', tmp.to_json)
        @redis.ltrim('recent-tests', 0, 100)

      end



      #
      # Clear an alert in redis
      #
      def clear

        return unless @redis


        tmp = {}
        tmp['time']   = Time.now.to_i
        tmp['type']   = @test.get_type
        tmp['target'] = @test.target
        tmp['result'] = 'OK'
        tmp['reason'] = ''
        tmp['test'  ] = @test.to_s
        tmp['class' ] = @test.class

        @redis.lpush('recent-tests', tmp.to_json)
        @redis.ltrim('recent-tests', 0, 100)
      end

      register_alert_type 'redis'

    end
  end
end