Class: Sensu::Server

Inherits:
Object
  • Object
show all
Includes:
Utilities
Defined in:
lib/sensu/server.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Utilities

#deep_diff, #deep_merge, #indifferent_hash, #redact_passwords, #retry_until_true, #testing?, #with_indifferent_access

Constructor Details

#initialize(options = {}) ⇒ Server

Returns a new instance of Server.



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# File 'lib/sensu/server.rb', line 20

def initialize(options={})
  base = Base.new(options)
  @logger = base.logger
  @settings = base.settings
  @extensions = base.extensions
  base.setup_process
  @timers = Array.new
  @master_timers = Array.new
  @handlers_in_progress_count = 0
  @is_master = false
end

Instance Attribute Details

#is_master ⇒ Object (readonly)

Returns the value of attribute is_master.



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# File 'lib/sensu/server.rb', line 10

def is_master
  @is_master
end

Class Method Details

.run(options = {}) ⇒ Object 



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# File 'lib/sensu/server.rb', line 12

def self.run(options={})
  server = self.new(options)
  EM::run do
    server.start
    server.trap_signals
  end
end

Instance Method Details

#action_subdued?(check, handler = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sensu/server.rb', line 98

def action_subdued?(check, handler=nil)
  subdue = false
  subdue_at = handler ? 'handler' : 'publisher'
  conditions = Array.new
  if check[:subdue]
    conditions << check[:subdue]
  end
  if handler && handler[:subdue]
    conditions << handler[:subdue]
  end
  conditions.each do |condition|
    if condition.has_key?(:begin) && condition.has_key?(:end)
      begin_time = Time.parse(condition[:begin])
      end_time = Time.parse(condition[:end])
      if end_time < begin_time
        if Time.now < end_time
          begin_time = Time.parse('12:00:00 AM')
        else
          end_time = Time.parse('11:59:59 PM')
        end
      end
      if Time.now >= begin_time && Time.now <= end_time
        subdue = true
      end
    end
    if condition.has_key?(:days)
      days = condition[:days].map(&:downcase)
      if days.include?(Time.now.strftime('%A').downcase)
        subdue = true
      end
    end
    if subdue && condition.has_key?(:exceptions)
      subdue = condition[:exceptions].none? do |exception|
        Time.now >= Time.parse(exception[:begin]) && Time.now <= Time.parse(exception[:end])
      end
    end
    if subdue
      if subdue_at == (condition[:at] || 'handler')
        break
      else
        subdue = false
      end
    end
  end
  subdue
end

#aggregate_result(result) ⇒ Object 



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# File 'lib/sensu/server.rb', line 390

def aggregate_result(result)
  @logger.debug('adding result to aggregate', {
    :result => result
  })
  check = result[:check]
  result_set = check[:name] + ':' + check[:issued].to_s
  @redis.hset('aggregation:' + result_set, result[:client], Oj.dump(
    :output => check[:output],
    :status => check[:status]
  )) do
    SEVERITIES.each do |severity|
      @redis.hsetnx('aggregate:' + result_set, severity, 0)
    end
    severity = (SEVERITIES[check[:status]] || 'unknown')
    @redis.hincrby('aggregate:' + result_set, severity, 1) do
      @redis.hincrby('aggregate:' + result_set, 'total', 1) do
        @redis.sadd('aggregates:' + check[:name], check[:issued]) do
          @redis.sadd('aggregates', check[:name])
        end
      end
    end
  end
end

#bootstrap ⇒ Object 



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# File 'lib/sensu/server.rb', line 773

def bootstrap
  setup_keepalives
  setup_results
  setup_master_monitor
  @state = :running
end

#complete_handlers_in_progress(&block) ⇒ Object 



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# File 'lib/sensu/server.rb', line 761

def complete_handlers_in_progress(&block)
  @logger.info('completing handlers in progress', {
    :handlers_in_progress_count => @handlers_in_progress_count
  })
  retry_until_true do
    if @handlers_in_progress_count == 0
      block.call
      true
    end
  end
end

#derive_handlers(handler_list) ⇒ Object 



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# File 'lib/sensu/server.rb', line 178

def derive_handlers(handler_list)
  handler_list.inject(Array.new) do |handlers, handler_name|
    if @settings.handler_exists?(handler_name)
      handler = @settings[:handlers][handler_name].merge(:name => handler_name)
      if handler[:type] == 'set'
        handlers = handlers + derive_handlers(handler[:handlers])
      else
        handlers << handler
      end
    elsif @extensions.handler_exists?(handler_name)
      handlers << @extensions[:handlers][handler_name]
    else
      @logger.error('unknown handler', {
        :handler_name => handler_name
      })
    end
    handlers.uniq
  end
end

#determine_stale_clients ⇒ Object 



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# File 'lib/sensu/server.rb', line 584

def determine_stale_clients
  @logger.info('determining stale clients')
  @redis.smembers('clients') do |clients|
    clients.each do |client_name|
      @redis.get('client:' + client_name) do |client_json|
        unless client_json.nil?
          client = Oj.load(client_json)
          check = {
            :name => 'keepalive',
            :issued => Time.now.to_i,
            :executed => Time.now.to_i
          }
          thresholds = {
            :warning => 120,
            :critical => 180
          }
          if client.has_key?(:keepalive)
            if client[:keepalive].has_key?(:handler) || client[:keepalive].has_key?(:handlers)
              check[:handlers] = Array(client[:keepalive][:handlers] || client[:keepalive][:handler])
            end
            if client[:keepalive].has_key?(:thresholds)
              thresholds.merge!(client[:keepalive][:thresholds])
            end
          end
          time_since_last_keepalive = Time.now.to_i - client[:timestamp]
          case
          when time_since_last_keepalive >= thresholds[:critical]
            check[:output] = 'No keep-alive sent from client in over '
            check[:output] << thresholds[:critical].to_s + ' seconds'
            check[:status] = 2
          when time_since_last_keepalive >= thresholds[:warning]
            check[:output] = 'No keep-alive sent from client in over '
            check[:output] << thresholds[:warning].to_s + ' seconds'
            check[:status] = 1
          else
            check[:output] = 'Keep-alive sent from client less than '
            check[:output] << thresholds[:warning].to_s + ' seconds ago'
            check[:status] = 0
          end
          publish_result(client, check)
        end
      end
    end
  end
end

#event_filtered?(filter_name, event) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sensu/server.rb', line 165

def event_filtered?(filter_name, event)
  if @settings.filter_exists?(filter_name)
    filter = @settings[:filters][filter_name]
    matched = filter_attributes_match?(filter[:attributes], event)
    filter[:negate] ? matched : !matched
  else
    @logger.error('unknown filter', {
      :filter_name => filter_name
    })
    false
  end
end

#event_handlers(event) ⇒ Object 



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# File 'lib/sensu/server.rb', line 198

def event_handlers(event)
  handler_list = Array((event[:check][:handlers] || event[:check][:handler]) || 'default')
  handlers = derive_handlers(handler_list)
  event_severity = SEVERITIES[event[:check][:status]] || 'unknown'
  handlers.select do |handler|
    if event[:action] == :flapping && !handler[:handle_flapping]
      @logger.info('handler does not handle flapping events', {
        :event => event,
        :handler => handler
      })
      next
    end
    if action_subdued?(event[:check], handler)
      @logger.info('action is subdued', {
        :event => event,
        :handler => handler
      })
      next
    end
    if handler.has_key?(:severities) && !handler[:severities].include?(event_severity)
      unless event[:action] == :resolve
        @logger.debug('handler does not handle event severity', {
          :event => event,
          :handler => handler
        })
        next
      end
    end
    if handler.has_key?(:filters) || handler.has_key?(:filter)
      filter_list = Array(handler[:filters] || handler[:filter])
      filtered = filter_list.any? do |filter_name|
        event_filtered?(filter_name, event)
      end
      if filtered
        @logger.info('event filtered for handler', {
          :event => event,
          :handler => handler
        })
        next
      end
    end
    true
  end
end

#execute_command(command, data = nil, on_error = nil, &block) ⇒ Object 



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# File 'lib/sensu/server.rb', line 243

def execute_command(command, data=nil, on_error=nil, &block)
  on_error ||= Proc.new do |error|
    @logger.error('failed to execute command', {
      :command => command,
      :data => data,
      :error => error.to_s
    })
  end
  execute = Proc.new do
    begin
      output, status = IO.popen(command, 'r+') do |child|
        unless data.nil?
          child.write(data.to_s)
        end
        child.close_write
      end
      [true, output, status]
    rescue => error
      on_error.call(error)
      [false, nil, nil]
    end
  end
  complete = Proc.new do |success, output, status|
    if success
      block.call(output, status)
    end
  end
  EM::defer(execute, complete)
end

#filter_attributes_match?(hash_one, hash_two) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sensu/server.rb', line 145

def filter_attributes_match?(hash_one, hash_two)
  hash_one.keys.all? do |key|
    case
    when hash_one[key] == hash_two[key]
      true
    when hash_one[key].is_a?(Hash) && hash_two[key].is_a?(Hash)
      filter_attributes_match?(hash_one[key], hash_two[key])
    when hash_one[key].is_a?(String) && hash_one[key].start_with?('eval:')
      begin
        expression = hash_one[key].gsub(/^eval:(\s+)?/, '')
        !!Sandbox.eval(expression, hash_two[key])
      rescue
        false
      end
    else
      false
    end
  end
end

#handle_event(event) ⇒ Object 



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# File 'lib/sensu/server.rb', line 316

def handle_event(event)
  handlers = event_handlers(event)
  handlers.each do |handler|
    log_level = event[:check][:type] == 'metric' ? :debug : :info
    @logger.send(log_level, 'handling event', {
      :event => event,
      :handler => handler
    })
    @handlers_in_progress_count += 1
    on_error = Proc.new do |error|
      @logger.error('handler error', {
        :event => event,
        :handler => handler,
        :error => error.to_s
      })
      @handlers_in_progress_count -= 1
    end
    mutate_event_data(handler[:mutator], event) do |event_data|
      case handler[:type]
      when 'pipe'
        execute_command(handler[:command], event_data, on_error) do |output, status|
          output.split(/\n+/).each do |line|
            @logger.info(line)
          end
          @handlers_in_progress_count -= 1
        end
      when 'tcp'
        begin
          EM::connect(handler[:socket][:host], handler[:socket][:port], SocketHandler) do |socket|
            socket.on_success = Proc.new do
              @handlers_in_progress_count -= 1
            end
            socket.on_error = on_error
            timeout = handler[:socket][:timeout] || 10
            socket.pending_connect_timeout = timeout
            socket.comm_inactivity_timeout = timeout
            socket.send_data(event_data.to_s)
            socket.close_connection_after_writing
          end
        rescue => error
          on_error.call(error)
        end
      when 'udp'
        begin
          EM::open_datagram_socket('127.0.0.1', 0, nil) do |socket|
            socket.send_datagram(event_data.to_s, handler[:socket][:host], handler[:socket][:port])
            socket.close_connection_after_writing
            @handlers_in_progress_count -= 1
          end
        rescue => error
          on_error.call(error)
        end
      when 'amqp'
        exchange_name = handler[:exchange][:name]
        exchange_type = handler[:exchange].has_key?(:type) ? handler[:exchange][:type].to_sym : :direct
        exchange_options = handler[:exchange].reject do |key, value|
          [:name, :type].include?(key)
        end
        unless event_data.empty?
          @amq.method(exchange_type).call(exchange_name, exchange_options).publish(event_data)
        end
        @handlers_in_progress_count -= 1
      when 'extension'
        handler.run(event_data, @settings.to_hash) do |output, status|
          output.split(/\n+/).each do |line|
            @logger.info(line)
          end
          @handlers_in_progress_count -= 1
        end
      end
    end
  end
end

#master_duties ⇒ Object 



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# File 'lib/sensu/server.rb', line 672

def master_duties
  setup_publisher
  setup_client_monitor
  setup_aggregation_pruner
end

#mutate_event_data(mutator_name, event, &block) ⇒ Object 



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# File 'lib/sensu/server.rb', line 273

def mutate_event_data(mutator_name, event, &block)
  case
  when mutator_name.nil?
    block.call(Oj.dump(event))
  when @settings.mutator_exists?(mutator_name)
    mutator = @settings[:mutators][mutator_name]
    on_error = Proc.new do |error|
      @logger.error('mutator error', {
        :event => event,
        :mutator => mutator,
        :error => error.to_s
      })
      @handlers_in_progress_count -= 1
    end
    execute_command(mutator[:command], Oj.dump(event), on_error) do |output, status|
      if status == 0
        block.call(output)
      else
        on_error.call('non-zero exit status (' + status.to_s + '): ' + output)
      end
    end
  when @extensions.mutator_exists?(mutator_name)
    extension = @extensions[:mutators][mutator_name]
    extension.run(event, @settings.to_hash) do |output, status|
      if status == 0
        block.call(output)
      else
        @logger.error('mutator error', {
          :event => event,
          :extension => extension.definition,
          :error => 'non-zero exit status (' + status.to_s + '): ' + output
        })
        @handlers_in_progress_count -= 1
      end
    end
  else
    @logger.error('unknown mutator', {
      :mutator_name => mutator_name
    })
    @handlers_in_progress_count -= 1
  end
end

#pause(&block) ⇒ Object 



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# File 'lib/sensu/server.rb', line 786

def pause(&block)
  unless @state == :pausing || @state == :paused
    @state = :pausing
    @timers.each do |timer|
      timer.cancel
    end
    @timers.clear
    unsubscribe
    resign_as_master do
      @state = :paused
      if block
        block.call
      end
    end
  end
end

#process_result(result) ⇒ Object 



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# File 'lib/sensu/server.rb', line 414

def process_result(result)
  @logger.debug('processing result', {
    :result => result
  })
  @redis.get('client:' + result[:client]) do |client_json|
    unless client_json.nil?
      client = Oj.load(client_json)
      check = case
      when @settings.check_exists?(result[:check][:name])
        @settings[:checks][result[:check][:name]].merge(result[:check])
      else
        result[:check]
      end
      if check[:aggregate]
        aggregate_result(result)
      end
      @redis.sadd('history:' + client[:name], check[:name])
      history_key = 'history:' + client[:name] + ':' + check[:name]
      @redis.rpush(history_key, check[:status]) do
        execution_key = 'execution:' + client[:name] + ':' + check[:name]
        @redis.set(execution_key, check[:executed])
        @redis.lrange(history_key, -21, -1) do |history|
          check[:history] = history
          total_state_change = 0
          unless history.size < 21
            state_changes = 0
            change_weight = 0.8
            previous_status = history.first
            history.each do |status|
              unless status == previous_status
                state_changes += change_weight
              end
              change_weight += 0.02
              previous_status = status
            end
            total_state_change = (state_changes.fdiv(20) * 100).to_i
            @redis.ltrim(history_key, -21, -1)
          end
          @redis.hget('events:' + client[:name], check[:name]) do |event_json|
            previous_occurrence = event_json ? Oj.load(event_json) : false
            is_flapping = false
            if check.has_key?(:low_flap_threshold) && check.has_key?(:high_flap_threshold)
              was_flapping = previous_occurrence ? previous_occurrence[:flapping] : false
              is_flapping = case
              when total_state_change >= check[:high_flap_threshold]
                true
              when was_flapping && total_state_change <= check[:low_flap_threshold]
                false
              else
                was_flapping
              end
            end
            event = {
              :client => client,
              :check => check,
              :occurrences => 1
            }
            if check[:status] != 0 || is_flapping
              if previous_occurrence && check[:status] == previous_occurrence[:status]
                event[:occurrences] = previous_occurrence[:occurrences] + 1
              end
              @redis.hset('events:' + client[:name], check[:name], Oj.dump(
                :output => check[:output],
                :status => check[:status],
                :issued => check[:issued],
                :handlers => Array((check[:handlers] || check[:handler]) || 'default'),
                :flapping => is_flapping,
                :occurrences => event[:occurrences]
              )) do
                unless check[:handle] == false
                  event[:action] = is_flapping ? :flapping : :create
                  handle_event(event)
                end
              end
            elsif previous_occurrence
              unless check[:auto_resolve] == false && !check[:force_resolve]
                @redis.hdel('events:' + client[:name], check[:name]) do
                  unless check[:handle] == false
                    event[:occurrences] = previous_occurrence[:occurrences]
                    event[:action] = :resolve
                    handle_event(event)
                  end
                end
              end
            elsif check[:type] == 'metric'
              handle_event(event)
            end
          end
        end
      end
    end
  end
end

#prune_aggregations ⇒ Object 



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# File 'lib/sensu/server.rb', line 637

def prune_aggregations
  @logger.info('pruning aggregations')
  @redis.smembers('aggregates') do |checks|
    checks.each do |check_name|
      @redis.smembers('aggregates:' + check_name) do |aggregates|
        if aggregates.size > 20
          aggregates.sort!
          aggregates.take(aggregates.size - 20).each do |check_issued|
            @redis.srem('aggregates:' + check_name, check_issued) do
              result_set = check_name + ':' + check_issued.to_s
              @redis.del('aggregate:' + result_set) do
                @redis.del('aggregation:' + result_set) do
                  @logger.debug('pruned aggregation', {
                    :check => {
                      :name => check_name,
                      :issued => check_issued
                    }
                  })
                end
              end
            end
          end
        end
      end
    end
  end
end

#publish_check_request(check) ⇒ Object 



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# File 'lib/sensu/server.rb', line 524

def publish_check_request(check)
  payload = {
    :name => check[:name],
    :issued => Time.now.to_i
  }
  if check.has_key?(:command)
    payload[:command] = check[:command]
  end
  @logger.info('publishing check request', {
    :payload => payload,
    :subscribers => check[:subscribers]
  })
  check[:subscribers].each do |exchange_name|
    @amq.fanout(exchange_name).publish(Oj.dump(payload))
  end
end

#publish_result(client, check) ⇒ Object 



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# File 'lib/sensu/server.rb', line 573

def publish_result(client, check)
  payload = {
    :client => client[:name],
    :check => check
  }
  @logger.debug('publishing check result', {
    :payload => payload
  })
  @amq.direct('results').publish(Oj.dump(payload))
end

#request_master_election ⇒ Object 



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# File 'lib/sensu/server.rb', line 678

def request_master_election
  @redis.setnx('lock:master', Time.now.to_i) do |created|
    if created
      @is_master = true
      @logger.info('i am the master')
      master_duties
    else
      @redis.get('lock:master') do |timestamp|
        if Time.now.to_i - timestamp.to_i >= 60
          @redis.getset('lock:master', Time.now.to_i) do |previous|
            if previous == timestamp
              @is_master = true
              @logger.info('i am now the master')
              master_duties
            end
          end
        end
      end
    end
  end
end

#resign_as_master(&block) ⇒ Object 



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# File 'lib/sensu/server.rb', line 713

def resign_as_master(&block)
  block ||= Proc.new {}
  if @is_master
    @logger.warn('resigning as master')
    @master_timers.each do |timer|
      timer.cancel
    end
    @master_timers.clear
    if @redis.connected?
      @redis.del('lock:master') do
        @logger.info('removed master lock')
        @is_master = false
      end
    end
    timestamp = Time.now.to_i
    retry_until_true do
      if !@is_master
        block.call
        true
      elsif Time.now.to_i - timestamp >= 3
        @logger.warn('failed to remove master lock')
        @is_master = false
        block.call
        true
      end
    end
  else
    @logger.debug('not currently master')
    block.call
  end
end

#resume ⇒ Object 



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# File 'lib/sensu/server.rb', line 803

def resume
  retry_until_true(1) do
    if @state == :paused
      if @redis.connected? && @rabbitmq.connected?
        bootstrap
        true
      end
    end
  end
end

#schedule_checks(checks) ⇒ Object 



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# File 'lib/sensu/server.rb', line 541

def schedule_checks(checks)
  check_count = 0
  stagger = testing? ? 0 : 2
  checks.each do |check|
    check_count += 1
    scheduling_delay = stagger * check_count % 30
    @master_timers << EM::Timer.new(scheduling_delay) do
      interval = testing? ? 0.5 : check[:interval]
      @master_timers << EM::PeriodicTimer.new(interval) do
        unless action_subdued?(check)
          publish_check_request(check)
        else
          @logger.info('check request was subdued', {
            :check => check
          })
        end
      end
    end
  end
end

#setup_aggregation_pruner ⇒ Object 



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# File 'lib/sensu/server.rb', line 665

def setup_aggregation_pruner
  @logger.debug('pruning aggregations')
  @master_timers << EM::PeriodicTimer.new(20) do
    prune_aggregations
  end
end

#setup_client_monitor ⇒ Object 



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# File 'lib/sensu/server.rb', line 630

def setup_client_monitor
  @logger.debug('monitoring clients')
  @master_timers << EM::PeriodicTimer.new(30) do
    determine_stale_clients
  end
end

#setup_keepalives ⇒ Object 



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# File 'lib/sensu/server.rb', line 81

def setup_keepalives
  @logger.debug('subscribing to keepalives')
  @keepalive_queue = @amq.queue!('keepalives')
  @keepalive_queue.bind(@amq.direct('keepalives'))
  @keepalive_queue.subscribe(:ack => true) do |header, payload|
    client = Oj.load(payload)
    @logger.debug('received keepalive', {
      :client => client
    })
    @redis.set('client:' + client[:name], Oj.dump(client)) do
      @redis.sadd('clients', client[:name]) do
        header.ack
      end
    end
  end
end

#setup_master_monitor ⇒ Object 



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# File 'lib/sensu/server.rb', line 700

def setup_master_monitor
  request_master_election
  @timers << EM::PeriodicTimer.new(20) do
    if @is_master
      @redis.set('lock:master', Time.now.to_i) do
        @logger.debug('updated master lock timestamp')
      end
    else
      request_master_election
    end
  end
end

#setup_publisher ⇒ Object 



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# File 'lib/sensu/server.rb', line 562

def setup_publisher
  @logger.debug('scheduling check requests')
  standard_checks = @settings.checks.reject do |check|
    check[:standalone] || check[:publish] == false
  end
  extension_checks = @extensions.checks.reject do |check|
    check[:standalone] || check[:publish] == false || !check[:interval].is_a?(Integer)
  end
  schedule_checks(standard_checks + extension_checks)
end

#setup_rabbitmq ⇒ Object 



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# File 'lib/sensu/server.rb', line 55

def setup_rabbitmq
  @logger.debug('connecting to rabbitmq', {
    :settings => @settings[:rabbitmq]
  })
  @rabbitmq = RabbitMQ.connect(@settings[:rabbitmq])
  @rabbitmq.on_error do |error|
    @logger.fatal('rabbitmq connection error', {
      :error => error.to_s
    })
    stop
  end
  @rabbitmq.before_reconnect do
    unless testing?
      @logger.warn('reconnecting to rabbitmq')
      pause
    end
  end
  @rabbitmq.after_reconnect do
    @logger.info('reconnected to rabbitmq')
    @amq.prefetch(1)
    resume
  end
  @amq = @rabbitmq.channel
  @amq.prefetch(1)
end

#setup_redis ⇒ Object 



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# File 'lib/sensu/server.rb', line 32

def setup_redis
  @logger.debug('connecting to redis', {
    :settings => @settings[:redis]
  })
  @redis = Redis.connect(@settings[:redis])
  @redis.on_error do |error|
    @logger.fatal('redis connection error', {
      :error => error.to_s
    })
    stop
  end
  @redis.before_reconnect do
    unless testing?
      @logger.warn('reconnecting to redis')
      pause
    end
  end
  @redis.after_reconnect do
    @logger.info('reconnected to redis')
    resume
  end
end

#setup_results ⇒ Object 



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# File 'lib/sensu/server.rb', line 508

def setup_results
  @logger.debug('subscribing to results')
  @result_queue = @amq.queue!('results')
  @result_queue.bind(@amq.direct('results'))
  @result_queue.subscribe(:ack => true) do |header, payload|
    result = Oj.load(payload)
    @logger.debug('received result', {
      :result => result
    })
    process_result(result)
    EM::next_tick do
      header.ack
    end
  end
end

#start ⇒ Object 



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# File 'lib/sensu/server.rb', line 780

def start
  setup_redis
  setup_rabbitmq
  bootstrap
end

#stop ⇒ Object 



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# File 'lib/sensu/server.rb', line 814

def stop
  @logger.warn('stopping')
  @state = :stopping
  pause do
    complete_handlers_in_progress do
      @extensions.stop_all do
        @redis.close
        @rabbitmq.close
        @logger.warn('stopping reactor')
        EM::stop_event_loop
      end
    end
  end
end

#trap_signals ⇒ Object 



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# File 'lib/sensu/server.rb', line 829

def trap_signals
  @signals = Array.new
  STOP_SIGNALS.each do |signal|
    Signal.trap(signal) do
      @signals << signal
    end
  end
  EM::PeriodicTimer.new(1) do
    signal = @signals.shift
    if STOP_SIGNALS.include?(signal)
      @logger.warn('received signal', {
        :signal => signal
      })
      stop
    end
  end
end

#unsubscribe ⇒ Object 



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# File 'lib/sensu/server.rb', line 745

def unsubscribe
  @logger.warn('unsubscribing from keepalive and result queues')
  if @rabbitmq.connected?
    @keepalive_queue.unsubscribe
    @result_queue.unsubscribe
    @amq.recover
  else
    @keepalive_queue.before_recovery do
      @keepalive_queue.unsubscribe
    end
    @result_queue.before_recovery do
      @result_queue.unsubscribe
    end
  end
end