Class: Sensu::Server
Instance Attribute Summary collapse
-
#is_master ⇒ Object
readonly
Returns the value of attribute is_master.
Class Method Summary collapse
Instance Method Summary collapse
- #action_subdued?(condition) ⇒ Boolean
- #aggregate_result(result) ⇒ Object
- #bootstrap ⇒ Object
- #check_request_subdued?(check) ⇒ Boolean
- #complete_handlers_in_progress(&block) ⇒ Object
- #derive_handlers(handler_list) ⇒ Object
- #determine_stale_clients ⇒ Object
- #event_filtered?(filter_name, event) ⇒ Boolean
- #event_handlers(event) ⇒ Object
- #filter_attributes_match?(hash_one, hash_two) ⇒ Boolean
- #handle_event(event) ⇒ Object
- #handler_subdued?(handler, check) ⇒ Boolean
-
#initialize(options = {}) ⇒ Server
constructor
A new instance of Server.
- #master_duties ⇒ Object
- #mutate_event_data(mutator_name, event, &block) ⇒ Object
- #pause(&block) ⇒ Object
- #process_result(result) ⇒ Object
- #prune_aggregations ⇒ Object
- #publish_check_request(check) ⇒ Object
- #publish_result(client, check) ⇒ Object
- #request_master_election ⇒ Object
- #resign_as_master(&block) ⇒ Object
- #resume ⇒ Object
- #schedule_checks(checks) ⇒ Object
- #setup_aggregation_pruner ⇒ Object
- #setup_client_monitor ⇒ Object
- #setup_keepalives(&block) ⇒ Object
- #setup_master_monitor ⇒ Object
- #setup_publisher ⇒ Object
- #setup_rabbitmq ⇒ Object
- #setup_redis ⇒ Object
- #setup_results(&block) ⇒ Object
- #start ⇒ Object
- #stop ⇒ Object
- #trap_signals ⇒ Object
- #unsubscribe ⇒ Object
Methods included from Utilities
#deep_diff, #deep_merge, #indifferent_hash, #redact_sensitive, #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(={}) base = Base.new() @logger = base.logger @settings = base.settings @extensions = base.extensions base.setup_process @extensions.load_settings(@settings.to_hash) @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(={}) server = self.new() EM::run do server.start server.trap_signals end end |
Instance Method Details
#action_subdued?(condition) ⇒ Boolean
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# File 'lib/sensu/server.rb', line 99 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 384 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 787 def bootstrap setup_keepalives setup_results setup_master_monitor @state = :running end |
#check_request_subdued?(check) ⇒ Boolean
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# File 'lib/sensu/server.rb', line 520 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 775 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 177 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 603 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 = { :thresholds => { :warning => 120, :critical => 180 } } 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_filtered?(filter_name, event) ⇒ Boolean
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# File 'lib/sensu/server.rb', line 164 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 197 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
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# File 'lib/sensu/server.rb', line 140 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 296 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' IO.async_popen(handler[:command], event_data, handler[:timeout]) 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 'amqp' exchange_name = handler[:exchange][:name] exchange_type = handler[:exchange].has_key?(:type) ? handler[:exchange][:type].to_sym : :direct = handler[:exchange].reject do |key, value| [:name, :type].include?(key) end unless event_data.empty? begin @amq.method(exchange_type).call(exchange_name, ).publish(event_data) rescue AMQ::Client::ConnectionClosedError => error @logger.error('failed to publish event data to an exchange', { :exchange => handler[:exchange], :payload => event_data, :error => error.to_s }) 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
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# File 'lib/sensu/server.rb', line 129 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 686 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 254 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] IO.async_popen(mutator[:command], Oj.dump(event), mutator[:timeout]) do |output, status| if status == 0 block.call(output) else @logger.error('mutator error', { :event => event, :mutator => mutator, :output => output, :status => status }) @handlers_in_progress_count -= 1 end end when @extensions.mutator_exists?(mutator_name) extension = @extensions[:mutators][mutator_name] extension.safe_run(event) do |output, status| if status == 0 block.call(output) else @logger.error('mutator extension error', { :event => event, :extension => extension.definition, :output => output, :status => status }) @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 800 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 408 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 651 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 528 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| begin @amq.fanout(exchange_name).publish(Oj.dump(payload)) rescue AMQ::Client::ConnectionClosedError => error @logger.error('failed to publish check request', { :exchange_name => exchange_name, :payload => payload, :error => error.to_s }) end end end |
#publish_result(client, check) ⇒ Object
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# File 'lib/sensu/server.rb', line 585 def publish_result(client, check) payload = { :client => client[:name], :check => check } @logger.debug('publishing check result', { :payload => payload }) begin @amq.direct('results').publish(Oj.dump(payload)) rescue AMQ::Client::ConnectionClosedError => error @logger.error('failed to publish check result', { :payload => payload, :error => error.to_s }) end end |
#request_master_election ⇒ Object
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# File 'lib/sensu/server.rb', line 692 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 || if Time.now.to_i - .to_i >= 60 @redis.getset('lock:master', Time.now.to_i) do |previous| if previous == @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 727 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 = Time.now.to_i retry_until_true do if !@is_master block.call true elsif Time.now.to_i - >= 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 817 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 553 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 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 679 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 644 def setup_client_monitor @logger.debug('monitoring clients') @master_timers << EM::PeriodicTimer.new(30) do determine_stale_clients end end |
#setup_keepalives(&block) ⇒ Object
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# File 'lib/sensu/server.rb', line 80 def setup_keepalives(&block) @logger.debug('subscribing to keepalives') @keepalive_queue = @amq.queue!('keepalives', :auto_delete => true) @keepalive_queue.bind(@amq.direct('keepalives')) do block.call if block end @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 714 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 574 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 56 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') resume end @amq = @rabbitmq.channel end |
#setup_redis ⇒ Object
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# File 'lib/sensu/server.rb', line 33 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(&block) ⇒ Object
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# File 'lib/sensu/server.rb', line 502 def setup_results(&block) @logger.debug('subscribing to results') @result_queue = @amq.queue!('results', :auto_delete => true) @result_queue.bind(@amq.direct('results')) do block.call if block end @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 794 def start setup_redis setup_rabbitmq bootstrap end |
#stop ⇒ Object
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# File 'lib/sensu/server.rb', line 828 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 843 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 759 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 |