Module: NewRelic::Agent::Agent::InstanceMethods

Includes:
Connect, Start, StartWorkerThread
Included in:
NewRelic::Agent::Agent
Defined in:
lib/new_relic/agent/agent.rb

Overview

Holds all the methods defined on NewRelic::Agent::Agent instances

Defined Under Namespace

Modules: Connect, Start, StartWorkerThread

Instance Attribute Summary collapse

Attributes included from Connect

#connect_attempts

Instance Method Summary collapse

Methods included from Connect

#add_rules_to_engine, #apdex_f, #connect_retry_period, #connect_settings, #connect_to_server, #connected?, #disconnect, #disconnected?, #environment_for_connect, #finish_setup, #generate_environment_report, #handle_license_error, #handle_unrecoverable_agent_error, #log_collector_messages, #log_connection!, #log_error, #note_connect_failure, #query_server_for_configuration, #should_connect?

Methods included from StartWorkerThread

#catch_errors, #create_and_run_worker_loop, #deferred_work!, #handle_force_disconnect, #handle_force_restart, #handle_other_error, #handle_server_connection_problem, #log_worker_loop_start

Methods included from Start

#already_started?, #app_name_configured?, #check_config_and_start_agent, #connect_in_foreground, #correct_license_length, #defer_for_resque?, #disabled?, #has_correct_license_key?, #has_license_key?, #install_exit_handler, #log_app_name, #log_dispatcher, #log_environment, #log_if, #log_startup, #log_unless, #log_version_and_pid, #monitoring?, #using_forking_dispatcher?, #using_sinatra?, #weird_ruby?

Instance Attribute Details

#beacon_configuration ⇒ Object (readonly)

a configuration for the Real User Monitoring system - handles things like static setup of the header for inclusion into pages



92
93
94
 
# File 'lib/new_relic/agent/agent.rb', line 92

def beacon_configuration
  @beacon_configuration
end

#cross_app_encoding_bytes ⇒ Object (readonly)

Returns the value of attribute cross_app_encoding_bytes.



95
96
97
 
# File 'lib/new_relic/agent/agent.rb', line 95

def cross_app_encoding_bytes
  @cross_app_encoding_bytes
end

#cross_app_monitor ⇒ Object (readonly)

Returns the value of attribute cross_app_monitor.



96
97
98
 
# File 'lib/new_relic/agent/agent.rb', line 96

def cross_app_monitor
  @cross_app_monitor
end

#cross_process_id ⇒ Object (readonly)

cross application tracing ids and encoding



94
95
96
 
# File 'lib/new_relic/agent/agent.rb', line 94

def cross_process_id
  @cross_process_id
end

#error_collector ⇒ Object (readonly)

error collector is a simple collection of recorded errors



85
86
87
 
# File 'lib/new_relic/agent/agent.rb', line 85

def error_collector
  @error_collector
end

#events ⇒ Object (readonly)

Global events dispatcher. This will provides our primary mechanism for agent-wide events, such as finishing configuration, error notification and request before/after from Rack.



102
103
104
 
# File 'lib/new_relic/agent/agent.rb', line 102

def events
  @events
end

#harvest_samplers ⇒ Object (readonly)

Returns the value of attribute harvest_samplers.



86
87
88
 
# File 'lib/new_relic/agent/agent.rb', line 86

def harvest_samplers
  @harvest_samplers
end

#metric_rules ⇒ Object (readonly)

Returns the value of attribute metric_rules.



107
108
109
 
# File 'lib/new_relic/agent/agent.rb', line 107

def metric_rules
  @metric_rules
end

#obfuscator ⇒ Object (readonly)

holds a proc that is used to obfuscate sql statements



76
77
78
 
# File 'lib/new_relic/agent/agent.rb', line 76

def obfuscator
  @obfuscator
end

#record_sql ⇒ Object (readonly)

whether we should record raw, obfuscated, or no sql



88
89
90
 
# File 'lib/new_relic/agent/agent.rb', line 88

def record_sql
  @record_sql
end

#service ⇒ Object

service for communicating with collector



98
99
100
 
# File 'lib/new_relic/agent/agent.rb', line 98

def service
  @service
end

#sql_sampler ⇒ Object (readonly)

Returns the value of attribute sql_sampler.



81
82
83
 
# File 'lib/new_relic/agent/agent.rb', line 81

def sql_sampler
  @sql_sampler
end

#stats_engine ⇒ Object (readonly)

the statistics engine that holds all the timeslice data



78
79
80
 
# File 'lib/new_relic/agent/agent.rb', line 78

def stats_engine
  @stats_engine
end

#thread_profiler ⇒ Object (readonly)

begins a thread profile session when instructed by agent commands



83
84
85
 
# File 'lib/new_relic/agent/agent.rb', line 83

def thread_profiler
  @thread_profiler
end

#transaction_rules ⇒ Object (readonly)

Transaction and metric renaming rules as provided by the collector on connect. The former are applied during txns, the latter during harvest.



106
107
108
 
# File 'lib/new_relic/agent/agent.rb', line 106

def transaction_rules
  @transaction_rules
end

#transaction_sampler ⇒ Object (readonly)

the transaction sampler that handles recording transactions



80
81
82
 
# File 'lib/new_relic/agent/agent.rb', line 80

def transaction_sampler
  @transaction_sampler
end

Instance Method Details

#add_harvest_sampler(subclass) ⇒ Object 



528
529
530
 
# File 'lib/new_relic/agent/agent.rb', line 528

def add_harvest_sampler(subclass)
  @harvest_samplers.add_sampler(subclass)
end

#after_fork(options = {}) ⇒ Object

This method should be called in a forked process after a fork. It assumes the parent process initialized the agent, but does not assume the agent started.

The call is idempotent, but not re-entrant.

  • It clears any metrics carried over from the parent process

  • Restarts the sampler thread if necessary

  • Initiates a new agent run and worker loop unless that was done in the parent process and :force_reconnect is not true

Options:

  • :force_reconnect => true to force the spawned process to establish a new connection, such as when forking a long running process. The default is false–it will only connect to the server if the parent had not connected.

  • :keep_retrying => false if we try to initiate a new connection, this tells me to only try it once so this method returns quickly if there is some kind of latency with the server.



183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
 
# File 'lib/new_relic/agent/agent.rb', line 183

def after_fork(options={})
  Agent.config.apply_config(NewRelic::Agent::Configuration::ManualSource.new(options), 1)

  if channel_id = options[:report_to_channel]
    @service = NewRelic::Agent::PipeService.new(channel_id)
    if connected?
      @connected_pid = $$
    else
      ::NewRelic::Agent.logger.debug("Child process #{$$} not reporting to non-connected parent.")
      @service.shutdown(Time.now)
      disconnect
    end
  end

  return if !Agent.config[:agent_enabled] ||
    !Agent.config[:monitor_mode] ||
    disconnected? ||
    @worker_thread && @worker_thread.alive?

  ::NewRelic::Agent.logger.debug "Starting the worker thread in #{$$} after forking."

  reset_objects_with_locks

  # Clear out stats that are left over from parent process
  reset_stats

  generate_environment_report
  start_worker_thread(options)
end

#agent_should_start? ⇒ Boolean

Check to see if the agent should start, returning true if it should.

Returns:

  • (Boolean) 


479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
 
# File 'lib/new_relic/agent/agent.rb', line 479

def agent_should_start?
  return false if already_started? || disabled?

  if defer_for_resque?
    ::NewRelic::Agent.logger.debug "Deferring startup for Resque in case it daemonizes"
    return false
  end

  unless app_name_configured?
    NewRelic::Agent.logger.error "No application name configured.",
      "The Agent cannot start without at least one. Please check your ",
      "newrelic.yml and ensure that it is valid and has at least one ",
      "value set for app_name in the #{NewRelic::Control.instance.env} ",
      "environment."
    return false
  end

  return true
end

#end_transaction ⇒ Object

Tells the statistics engine we are ending a transaction



261
262
263
 
# File 'lib/new_relic/agent/agent.rb', line 261

def end_transaction
  @stats_engine.end_transaction
end

#merge_data_from(data) ⇒ Object

Accepts an array of (metrics, transaction_traces, errors) and merges it into our current collection of data to send. Can be dangerous if we re-merge the same data more than once - it will be sent multiple times.



822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
 
# File 'lib/new_relic/agent/agent.rb', line 822

def merge_data_from(data)
  metrics, transaction_traces, errors = data
  @stats_engine.merge!(metrics) if metrics
  if transaction_traces && transaction_traces.respond_to?(:any?) &&
      transaction_traces.any?
    if @traces
      @traces += transaction_traces
    else
      @traces = transaction_traces
    end
  end
  if errors && errors.respond_to?(:each)
    errors.each do |err|
      @error_collector.add_to_error_queue(err)
    end
  end
end

#pop_trace_execution_flag ⇒ Object

Pop the current trace execution status. Restore trace execution status to what it was before we pushed the current flag.



298
299
300
 
# File 'lib/new_relic/agent/agent.rb', line 298

def pop_trace_execution_flag
  Thread.current[:newrelic_untraced].pop if Thread.current[:newrelic_untraced]
end

#push_trace_execution_flag(should_trace = false) ⇒ Object

Push flag indicating whether we should be tracing in this thread. This uses a stack which allows us to disable tracing children of a transaction without affecting the tracing of the whole transaction



287
288
289
290
291
292
293
294
 
# File 'lib/new_relic/agent/agent.rb', line 287

def push_trace_execution_flag(should_trace=false)
  value = Thread.current[:newrelic_untraced]
  if (value.nil?)
    Thread.current[:newrelic_untraced] = []
  end

  Thread.current[:newrelic_untraced] << should_trace
end

#record_transaction(duration_seconds, options = {}) ⇒ Object

fakes out a transaction that did not happen in this process by creating apdex, summary metrics, and recording statistics for the transaction

This method is deprecated - it may be removed in future versions of the agent



134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
 
# File 'lib/new_relic/agent/agent.rb', line 134

def record_transaction(duration_seconds, options={})
  is_error = options['is_error'] || options['error_message'] || options['exception']
  metric = options['metric']
  metric ||= options['uri'] # normalize this with url rules
  raise "metric or uri arguments required" unless metric
  metric_info = NewRelic::MetricParser::MetricParser.for_metric_named(metric)

  if metric_info.is_web_transaction?
    NewRelic::Agent::Transaction.record_apdex(metric_info, duration_seconds, duration_seconds, is_error)
  end
  metrics = metric_info.summary_metrics

  metrics << metric
  metrics.each do |name|
    NewRelic::Agent.record_metric(name, duration_seconds)
  end

  if is_error
    if options['exception']
      e = options['exception']
    elsif options['error_message']
      e = StandardError.new options['error_message']
    else
      e = StandardError.new 'Unknown Error'
    end
    error_collector.notice_error e, :uri => options['uri'], :metric => metric
  end
  # busy time ?
end

#reset_objects_with_locks ⇒ Object

Clear out state for any objects that we know lock from our parents This is necessary for cases where we’re in a forked child and Ruby might be holding locks for background thread that aren’t there anymore.



524
525
526
 
# File 'lib/new_relic/agent/agent.rb', line 524

def reset_objects_with_locks
  @stats_engine = NewRelic::Agent::StatsEngine.new
end

#reset_stats ⇒ Object

Clear out the metric data, errors, and transaction traces, making sure the agent is in a fresh state



512
513
514
515
516
517
518
519
 
# File 'lib/new_relic/agent/agent.rb', line 512

def reset_stats
  @stats_engine.reset_stats
  @unsent_errors = []
  @traces = nil
  @unsent_timeslice_data = {}
  @last_harvest_time = Time.now
  @launch_time = Time.now
end

#set_record_sql(should_record) ⇒ Object

Sets a thread local variable as to whether we should or should not record sql in the current thread. Returns the previous value, if there is one



268
269
270
271
272
 
# File 'lib/new_relic/agent/agent.rb', line 268

def set_record_sql(should_record)
  prev = Thread::current[:record_sql]
  Thread::current[:record_sql] = should_record
  prev.nil? || prev
end

#set_record_tt(should_record) ⇒ Object

Sets a thread local variable as to whether we should or should not record transaction traces in the current thread. Returns the previous value, if there is one



277
278
279
280
281
 
# File 'lib/new_relic/agent/agent.rb', line 277

def set_record_tt(should_record)
  prev = Thread::current[:record_tt]
  Thread::current[:record_tt] = should_record
  prev.nil? || prev
end

#shutdown(options = {}) ⇒ Object

Attempt a graceful shutdown of the agent, running the worker loop if it exists and is running.

Options: :force_send => (true/false) # force the agent to send data



223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
 
# File 'lib/new_relic/agent/agent.rb', line 223

def shutdown(options={})
  run_loop_before_exit = Agent.config[:force_send]
  return if not started?
  if @worker_loop
    @worker_loop.run_task if run_loop_before_exit
    @worker_loop.stop
  end

  ::NewRelic::Agent.logger.info "Starting Agent shutdown"

  # if litespeed, then ignore all future SIGUSR1 - it's
  # litespeed trying to shut us down
  if Agent.config[:dispatcher] == :litespeed
    Signal.trap("SIGUSR1", "IGNORE")
    Signal.trap("SIGTERM", "IGNORE")
  end

  begin
    NewRelic::Agent.disable_all_tracing do
      graceful_disconnect
    end
  rescue => e
    ::NewRelic::Agent.logger.error e
  end
  NewRelic::Agent.config.remove_config do |config|
    config.class == NewRelic::Agent::Configuration::ManualSource ||
      config.class == NewRelic::Agent::Configuration::ServerSource
  end
  @started = nil
  Control.reset
end

#start ⇒ Object

Logs a bunch of data and starts the agent, if needed



500
501
502
503
504
505
506
507
508
 
# File 'lib/new_relic/agent/agent.rb', line 500

def start
  return unless agent_should_start?

  @started = true
  @local_host = determine_host
  log_startup
  check_config_and_start_agent
  log_version_and_pid
end

#start_transaction ⇒ Object

Tells the statistics engine we are starting a new transaction



256
257
258
 
# File 'lib/new_relic/agent/agent.rb', line 256

def start_transaction
  @stats_engine.start_transaction
end

#started? ⇒ Boolean

True if we have initialized and completed ‘start’

Returns:

  • (Boolean) 


214
215
216
 
# File 'lib/new_relic/agent/agent.rb', line 214

def started?
  @started
end

#unsent_errors_size ⇒ Object

Returns the length of the unsent errors array, if it exists, otherwise nil



111
112
113
 
# File 'lib/new_relic/agent/agent.rb', line 111

def unsent_errors_size
  @unsent_errors.length if @unsent_errors
end

#unsent_timeslice_data ⇒ Object

Initializes the unsent timeslice data hash, if needed, and returns the number of keys it contains



123
124
125
126
 
# File 'lib/new_relic/agent/agent.rb', line 123

def unsent_timeslice_data
  @unsent_timeslice_data ||= {}
  @unsent_timeslice_data.keys.length
end

#unsent_traces_size ⇒ Object

Returns the length of the traces array, if it exists, otherwise nil



117
118
119
 
# File 'lib/new_relic/agent/agent.rb', line 117

def unsent_traces_size
  @traces.length if @traces
end