Class: Sensu::Server

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

Instance Attribute Summary collapse

Attributes included from Daemon

#state

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Daemon

#load_extensions, #load_settings, #log_concerns, #setup_logger, #setup_process, #setup_redis, #setup_signal_traps, #setup_transport

Methods included from Utilities

#deep_merge, #random_uuid, #redact_sensitive, #retry_until_true, #testing?

Constructor Details

#initialize(options = {}) ⇒ Server

Returns a new instance of Server.



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# File 'lib/sensu/server.rb', line 19

def initialize(options={})
  super
  @is_master = false
  @timers[:master] = Array.new
  @handlers_in_progress_count = 0
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 9

def is_master
  @is_master
end

Class Method Details

.run(options = {}) ⇒ Object 



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# File 'lib/sensu/server.rb', line 11

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

Instance Method Details

#action_subdued?(condition) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sensu/server.rb', line 41

def action_subdued?(condition)
  subdued = false
  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
      subdued = true
    end
  end
  if condition.has_key?(:days)
    days = condition[:days].map(&:downcase)
    if days.include?(Time.now.strftime('%A').downcase)
      subdued = true
    end
  end
  if subdued && condition.has_key?(:exceptions)
    subdued = condition[:exceptions].none? do |exception|
      Time.now >= Time.parse(exception[:begin]) && Time.now <= Time.parse(exception[:end])
    end
  end
  subdued
end

#aggregate_result(result) ⇒ Object 



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# File 'lib/sensu/server.rb', line 321

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], MultiJson.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 702

def bootstrap
  setup_keepalives
  setup_results
  setup_master_monitor
  @state = :running
end

#check_request_subdued?(check) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sensu/server.rb', line 461

def check_request_subdued?(check)
  if check[:subdue] && check[:subdue][:at] == 'publisher'
    action_subdued?(check[:subdue])
  else
    false
  end
end

#complete_handlers_in_progress(&block) ⇒ Object 



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# File 'lib/sensu/server.rb', line 690

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, depth = 0) ⇒ Object 



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# File 'lib/sensu/server.rb', line 119

def derive_handlers(handler_list, depth=0)
  handler_list.compact.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'
        if depth < 2
          handlers = handlers + derive_handlers(handler[:handlers], depth + 1)
        else
          @logger.error('handler sets cannot be deeply nested', {
            :handler => handler
          })
        end
      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 544

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

#event_bridges(event) ⇒ Object 



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# File 'lib/sensu/server.rb', line 345

def event_bridges(event)
  @extensions[:bridges].each do |name, bridge|
    bridge.safe_run(event) do |output, status|
      output.each_line do |line|
        @logger.debug('bridge extension output', {
          :extension => bridge.definition,
          :output => line
        })
      end
    end
  end
end

#event_filtered?(filter_name, event) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sensu/server.rb', line 106

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 145

def event_handlers(event)
  handler_list = Array((event[:check][:handlers] || event[:check][:handler]) || 'default')
  handlers = derive_handlers(handler_list)
  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 handler_subdued?(handler, event[:check])
      @logger.info('handler is subdued', {
        :event => event,
        :handler => handler
      })
      next
    end
    if handler.has_key?(:severities)
      handle = case event[:action]
      when :resolve
        event[:check][:history].reverse[1..-1].any? do |status|
          if status.to_i == 0
            break
          end
          severity = SEVERITIES[status.to_i] || 'unknown'
          handler[:severities].include?(severity)
        end
      else
        severity = SEVERITIES[event[:check][:status]] || 'unknown'
        handler[:severities].include?(severity)
      end
      unless handle
        @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

#filter_attributes_match?(hash_one, hash_two) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sensu/server.rb', line 82

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 => error
        @logger.error('filter eval error', {
          :attributes => [hash_one, hash_two],
          :error => error.to_s
        })
        false
      end
    else
      false
    end
  end
end

#handle_event(event) ⇒ Object 



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# File 'lib/sensu/server.rb', line 236

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.respond_to?(:definition) ? handler.definition : 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'
        options = {:data => event_data, :timeout => handler[:timeout]}
        Spawn.process(handler[:command], options) do |output, status|
          output.each_line do |line|
            @logger.info('handler output', {
              :handler => handler,
              :output => 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[: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('0.0.0.0', 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 'transport'
        unless event_data.empty?
          pipe = handler[:pipe]
          @transport.publish(pipe[:type].to_sym, pipe[:name], event_data, pipe[:options] || Hash.new) do |info|
            if info[:error]
              @logger.fatal('failed to publish event data to the transport', {
                :pipe => pipe,
                :payload => event_data,
                :error => info[:error].to_s
              })
            end
          end
        end
        @handlers_in_progress_count -= 1
      when 'extension'
        handler.safe_run(event_data) do |output, status|
          output.each_line do |line|
            @logger.info('handler extension output', {
              :extension => handler.definition,
              :output => line
            })
          end
          @handlers_in_progress_count -= 1
        end
      end
    end
  end
end

#handler_subdued?(handler, check) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sensu/server.rb', line 71

def handler_subdued?(handler, check)
  subdued = Array.new
  if handler[:subdue]
    subdued << action_subdued?(handler[:subdue])
  end
  if check[:subdue] && check[:subdue][:at] != 'publisher'
    subdued << action_subdued?(check[:subdue])
  end
  subdued.any?
end

#master_duties ⇒ Object 



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# File 'lib/sensu/server.rb', line 631

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 202

def mutate_event_data(mutator_name, event, &block)
  mutator_name ||= 'json'
  return_output = Proc.new do |output, status|
    if status == 0
      block.dup.call(output)
    else
      @logger.error('mutator error', {
        :event => event,
        :output => output,
        :status => status
      })
      @handlers_in_progress_count -= 1
    end
  end
  @logger.debug('mutating event data', {
    :event => event,
    :mutator_name => mutator_name
  })
  case
  when @settings.mutator_exists?(mutator_name)
    mutator = @settings[:mutators][mutator_name]
    options = {:data => MultiJson.dump(event), :timeout => mutator[:timeout]}
    Spawn.process(mutator[:command], options, &return_output)
  when @extensions.mutator_exists?(mutator_name)
    extension = @extensions[:mutators][mutator_name]
    extension.safe_run(event, &return_output)
  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 715

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

#process_result(result) ⇒ Object 



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# File 'lib/sensu/server.rb', line 358

def process_result(result)
  @logger.debug('processing result', {
    :result => result
  })
  @redis.get('client:' + result[:client]) do |client_json|
    unless client_json.nil?
      client = MultiJson.load(client_json)
      check = case
      when @settings.check_exists?(result[:check][:name]) && !result[:check][:standalone]
        @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 ? MultiJson.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[:action] == 'flapping'
              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 = {
              :id => random_uuid,
              :client => client,
              :check => check,
              :occurrences => 1
            }
            if check[:status] != 0 || is_flapping
              if previous_occurrence && check[:status] == previous_occurrence[:check][:status]
                event[:occurrences] = previous_occurrence[:occurrences] + 1
              end
              event[:action] = is_flapping ? :flapping : :create
              @redis.hset('events:' + client[:name], check[:name], MultiJson.dump(event)) do
                unless check[:handle] == false
                  handle_event(event)
                end
              end
            elsif previous_occurrence
              event[:occurrences] = previous_occurrence[:occurrences]
              event[:action] = :resolve
              unless check[:auto_resolve] == false && !check[:force_resolve]
                @redis.hdel('events:' + client[:name], check[:name]) do
                  unless check[:handle] == false
                    handle_event(event)
                  end
                end
              end
            elsif check[:type] == 'metric'
              handle_event(event)
            end
            event_bridges(event)
          end
        end
      end
    end
  end
end

#prune_aggregations ⇒ Object 



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# File 'lib/sensu/server.rb', line 596

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 469

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 |subscription|
    @transport.publish(:fanout, subscription, MultiJson.dump(payload)) do |info|
      if info[:error]
        @logger.error('failed to publish check request', {
          :subscription => subscription,
          :payload => payload,
          :error => info[:error].to_s
        })
      end
    end
  end
end

#publish_result(client, check) ⇒ Object 



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# File 'lib/sensu/server.rb', line 526

def publish_result(client, check)
  payload = {
    :client => client[:name],
    :check => check
  }
  @logger.debug('publishing check result', {
    :payload => payload
  })
  @transport.publish(:direct, 'results', MultiJson.dump(payload)) do |info|
    if info[:error]
      @logger.error('failed to publish check result', {
        :payload => payload,
        :error => info[:error].to_s
      })
    end
  end
end

#request_master_election ⇒ Object 



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

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 >= 30
          @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 ⇒ Object 



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

def resign_as_master
  if @is_master
    @logger.warn('resigning as master')
    @timers[:master].each do |timer|
      timer.cancel
    end
    @timers[:master].clear
    @is_master = false
  else
    @logger.debug('not currently master')
  end
end

#resume ⇒ Object 



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# File 'lib/sensu/server.rb', line 731

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

#schedule_checks(checks) ⇒ Object 



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# File 'lib/sensu/server.rb', line 494

def schedule_checks(checks)
  check_count = 0
  stagger = testing? ? 0 : 2
  checks.each do |check|
    check_count += 1
    scheduling_delay = stagger * check_count % 30
    @timers[:master] << EM::Timer.new(scheduling_delay) do
      interval = testing? ? 0.5 : check[:interval]
      @timers[:master] << EM::PeriodicTimer.new(interval) do
        unless check_request_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 624

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

#setup_client_monitor ⇒ Object 



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# File 'lib/sensu/server.rb', line 589

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

#setup_keepalives ⇒ Object 



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# File 'lib/sensu/server.rb', line 26

def setup_keepalives
  @logger.debug('subscribing to keepalives')
  @transport.subscribe(:direct, 'keepalives', 'keepalives', :ack => true) do |message_info, message|
    client = MultiJson.load(message)
    @logger.debug('received keepalive', {
      :client => client
    })
    @redis.set('client:' + client[:name], MultiJson.dump(client)) do
      @redis.sadd('clients', client[:name]) do
        @transport.ack(message_info)
      end
    end
  end
end

#setup_master_monitor ⇒ Object 



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# File 'lib/sensu/server.rb', line 659

def setup_master_monitor
  request_master_election
  @timers[:run] << EM::PeriodicTimer.new(10) 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 515

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_results ⇒ Object 



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# File 'lib/sensu/server.rb', line 447

def setup_results
  @logger.debug('subscribing to results')
  @transport.subscribe(:direct, 'results', 'results', :ack => true) do |message_info, message|
    result = MultiJson.load(message)
    @logger.debug('received result', {
      :result => result
    })
    process_result(result)
    EM::next_tick do
      @transport.ack(message_info)
    end
  end
end

#start ⇒ Object 



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# File 'lib/sensu/server.rb', line 709

def start
  setup_redis
  setup_transport
  bootstrap
end

#stop ⇒ Object 



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# File 'lib/sensu/server.rb', line 742

def stop
  @logger.warn('stopping')
  pause do
    @state = :stopping
    complete_handlers_in_progress do
      @redis.close
      @transport.close
      super
    end
  end
end

#unsubscribe ⇒ Object 



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# File 'lib/sensu/server.rb', line 685

def unsubscribe
  @logger.warn('unsubscribing from keepalive and result queues')
  @transport.unsubscribe
end