Class: Bolt::Executor

Inherits:
Object
  • Object
show all
Defined in:
lib/bolt/executor.rb

Defined Under Namespace

Classes: TimeoutError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(concurrency = 1, analytics = Bolt::Analytics::NoopClient.new, noop = false, modified_concurrency = false, future = {}) ⇒ Executor

Returns a new instance of Executor.



41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
# File 'lib/bolt/executor.rb', line 41

def initialize(concurrency = 1,
               analytics = Bolt::Analytics::NoopClient.new,
               noop = false,
               modified_concurrency = false,
               future = {})
  # lazy-load expensive gem code
  require 'concurrent'
  @analytics = analytics
  @logger = Bolt::Logger.logger(self)

  @transports = Bolt::TRANSPORTS.each_with_object({}) do |(key, val), coll|
    coll[key.to_s] = if key == :remote
                       Concurrent::Delay.new do
                         val.new(self)
                       end
                     else
                       Concurrent::Delay.new do
                         val.new
                       end
                     end
  end
  @reported_transports = Set.new
  @subscribers = {}
  @publisher = Concurrent::SingleThreadExecutor.new
  @publisher.post { Thread.current[:name] = 'event-publisher' }

  @noop = noop
  @run_as = nil
  @future = future
  @pool = if concurrency > 0
            Concurrent::ThreadPoolExecutor.new(name: 'exec', max_threads: concurrency)
          else
            Concurrent.global_immediate_executor
          end
  @logger.debug { "Started with #{concurrency} max thread(s)" }

  @concurrency = concurrency
  @warn_concurrency = modified_concurrency
  @fiber_executor = Bolt::FiberExecutor.new
end

Instance Attribute Details

#futureObject (readonly)

Returns the value of attribute future.



38
39
40
# File 'lib/bolt/executor.rb', line 38

def future
  @future
end

#noopObject (readonly)

Returns the value of attribute noop.



38
39
40
# File 'lib/bolt/executor.rb', line 38

def noop
  @noop
end

#run_asObject

Returns the value of attribute run_as.



39
40
41
# File 'lib/bolt/executor.rb', line 39

def run_as
  @run_as
end

#transportsObject (readonly)

Returns the value of attribute transports.



38
39
40
# File 'lib/bolt/executor.rb', line 38

def transports
  @transports
end

Instance Method Details

#await_results(promises) ⇒ Object

Create a ResultSet from the results of all promises.



181
182
183
# File 'lib/bolt/executor.rb', line 181

def await_results(promises)
  ResultSet.new(promises.map(&:value))
end

#batch_execute(targets, &block) ⇒ Object

Execute the given block on a list of nodes in parallel, one thread per “batch”.

This is the main driver of execution on a list of targets. It first groups targets by transport, then divides each group into batches as defined by the transport. Each batch, along with the corresponding transport, is yielded to the block in turn and the results all collected into a single ResultSet.



192
193
194
195
# File 'lib/bolt/executor.rb', line 192

def batch_execute(targets, &block)
  promises = queue_execute(targets, &block)
  await_results(promises)
end

#create_future(plan_id:, scope: nil, name: nil, &block) ⇒ Object

Call into FiberExecutor to avoid this class getting overloaded while also minimizing the Puppet lookups needed from plan functions



387
388
389
# File 'lib/bolt/executor.rb', line 387

def create_future(plan_id:, scope: nil, name: nil, &block)
  @fiber_executor.create_future(scope: scope, name: name, plan_id: plan_id, &block)
end

#download_file(targets, source, destination, options = {}, position = []) ⇒ Object



358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
# File 'lib/bolt/executor.rb', line 358

def download_file(targets, source, destination, options = {}, position = [])
  description = options.fetch(:description, "file download from #{source} to #{destination}")

  begin
    FileUtils.mkdir_p(destination)
  rescue Errno::EEXIST => e
    message = "#{e.message}; unable to create destination directory #{destination}"
    raise Bolt::Error.new(message, 'bolt/file-exist-error')
  end

  log_action(description, targets) do
    options[:run_as] = run_as if run_as && !options.key?(:run_as)

    batch_execute(targets) do |transport, batch|
      with_node_logging("Downloading file #{source} to #{destination}", batch) do
        transport.batch_download(batch, source, destination, options, position, &method(:publish_event))
      end
    end
  end
end

#finish_plan(plan_result) ⇒ Object



526
527
528
# File 'lib/bolt/executor.rb', line 526

def finish_plan(plan_result)
  transport('pcp').finish_plan(plan_result)
end

#get_current_future(fiber:) ⇒ Object



391
392
393
# File 'lib/bolt/executor.rb', line 391

def get_current_future(fiber:)
  @fiber_executor.get_current_future(fiber: fiber)
end

#get_current_plan_id(fiber:) ⇒ Object



395
396
397
# File 'lib/bolt/executor.rb', line 395

def get_current_plan_id(fiber:)
  @fiber_executor.get_current_plan_id(fiber: fiber)
end

#get_futures_for_plan(plan_id:) ⇒ Object



415
416
417
# File 'lib/bolt/executor.rb', line 415

def get_futures_for_plan(plan_id:)
  @fiber_executor.get_futures_for_plan(plan_id: plan_id)
end

#in_parallel?Boolean

Returns:

  • (Boolean)


407
408
409
# File 'lib/bolt/executor.rb', line 407

def in_parallel?
  @fiber_executor.in_parallel?
end

#log_action(description, targets) ⇒ Object



197
198
199
200
201
202
203
204
205
206
207
# File 'lib/bolt/executor.rb', line 197

def log_action(description, targets)
  publish_event(type: :step_start, description: description, targets: targets)

  start_time = Time.now
  results = yield
  duration = Time.now - start_time

  publish_event(type: :step_finish, description: description, result: results, duration: duration)

  results
end

#log_plan(plan_name) ⇒ Object



209
210
211
212
213
214
215
216
217
218
219
220
221
222
# File 'lib/bolt/executor.rb', line 209

def log_plan(plan_name)
  publish_event(type: :plan_start, plan: plan_name)
  start_time = Time.now

  results = nil
  begin
    results = yield
  ensure
    duration = Time.now - start_time
    publish_event(type: :plan_finish, plan: plan_name, duration: duration)
  end

  results
end

#plan_complete?Boolean

Returns:

  • (Boolean)


399
400
401
# File 'lib/bolt/executor.rb', line 399

def plan_complete?
  @fiber_executor.plan_complete?
end

#prompt(prompt, options) ⇒ Object



484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
# File 'lib/bolt/executor.rb', line 484

def prompt(prompt, options)
  unless $stdin.tty?
    return options[:default] if options[:default]
    raise Bolt::Error.new('STDIN is not a tty, unable to prompt', 'bolt/no-tty-error')
  end

  @prompting = true

  if options[:default] && !options[:sensitive]
    $stderr.print("#{prompt} [#{options[:default]}]: ")
  else
    $stderr.print("#{prompt}: ")
  end

  value = if options[:sensitive]
            $stdin.noecho(&:gets).to_s.chomp
          else
            $stdin.gets.to_s.chomp
          end

  @prompting = false

  $stderr.puts if options[:sensitive]

  value = options[:default] if value.empty?
  value
end

#publish_event(event) ⇒ Object



103
104
105
106
107
108
109
110
111
112
113
114
# File 'lib/bolt/executor.rb', line 103

def publish_event(event)
  @subscribers.each do |subscriber, types|
    # If types isn't set or if the subscriber is subscribed to
    # that type of event, publish the event
    next unless types.nil? || types.include?(event[:type])
    @publisher.post(subscriber) do |sub|
      # Wait for user to input to prompt before printing anything
      sleep(0.1) while @prompting
      sub.handle_event(event)
    end
  end
end

#queue_execute(targets) ⇒ Object

Starts executing the given block on a list of nodes in parallel, one thread per “batch”.

This is the main driver of execution on a list of targets. It first groups targets by transport, then divides each group into batches as defined by the transport. Yields each batch, along with the corresponding transport, to the block in turn and returns an array of result promises.



127
128
129
130
131
132
133
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
# File 'lib/bolt/executor.rb', line 127

def queue_execute(targets)
  if @warn_concurrency && targets.length > @concurrency
    @warn_concurrency = false
    msg = "The ulimit is low, which might cause file limit issues. Default concurrency has been set to "\
          "'#{@concurrency}' to mitigate those issues, which might cause Bolt to run slow. "\
          "Disable this warning by configuring ulimit using 'ulimit -n <limit>' in your shell "\
          "configuration, or by configuring Bolt's concurrency. "\
          "See https://puppet.com/docs/bolt/latest/bolt_known_issues.html for details."
    Bolt::Logger.warn("low_ulimit", msg)
  end

  targets.group_by(&:transport).flat_map do |protocol, protocol_targets|
    transport = transport(protocol)
    report_transport(transport, protocol_targets.count)
    transport.batches(protocol_targets).flat_map do |batch|
      batch_promises = Array(batch).each_with_object({}) do |target, h|
        h[target] = Concurrent::Promise.new(executor: :immediate)
      end
      # Pass this argument through to avoid retaining a reference to a
      # local variable that will change on the next iteration of the loop.
      @pool.post(batch_promises) do |result_promises|
        Thread.current[:name] ||= Thread.current.name
        results = yield transport, batch
        Array(results).each do |result|
          result_promises[result.target].set(result)
        end
      # NotImplementedError can be thrown if the transport is not implemented improperly
      rescue StandardError, NotImplementedError => e
        result_promises.each do |target, promise|
          # If an exception happens while running, the result won't be logged
          # by the CLI. Log a warning, as this is probably a problem with the transport.
          # If batch_* commands are used from the Base transport, then exceptions
          # normally shouldn't reach here.
          @logger.warn(e)
          promise.set(Bolt::Result.from_exception(target, e))
        end
      ensure
        # Make absolutely sure every promise gets a result to avoid a
        # deadlock. Use whatever exception is causing this block to
        # execute, or generate one if we somehow got here without an
        # exception and some promise is still missing a result.
        result_promises.each do |target, promise|
          next if promise.fulfilled?
          error = $ERROR_INFO || Bolt::Error.new("No result was returned for #{target.uri}",
                                                 "puppetlabs.bolt/missing-result-error")
          promise.set(Bolt::Result.from_exception(target, error))
        end
      end
      batch_promises.values
    end
  end
end

#report_apply(statement_count, resource_counts) ⇒ Object



249
250
251
252
253
254
255
256
257
258
259
# File 'lib/bolt/executor.rb', line 249

def report_apply(statement_count, resource_counts)
  data = { statement_count: statement_count }

  unless resource_counts.empty?
    sum = resource_counts.inject(0) { |accum, i| accum + i }
    # Intentionally rounded to an integer. High precision isn't useful.
    data[:resource_mean] = sum / resource_counts.length
  end

  @analytics&.event('Apply', 'ast', **data)
end

#report_bundled_content(mode, name) ⇒ Object



236
237
238
# File 'lib/bolt/executor.rb', line 236

def report_bundled_content(mode, name)
  @analytics.report_bundled_content(mode, name)
end

#report_file_source(plan_function, source) ⇒ Object



240
241
242
243
# File 'lib/bolt/executor.rb', line 240

def report_file_source(plan_function, source)
  label = Pathname.new(source).absolute? ? 'absolute' : 'module'
  @analytics&.event('Plan', plan_function, label: label)
end

#report_function_call(function) ⇒ Object



232
233
234
# File 'lib/bolt/executor.rb', line 232

def report_function_call(function)
  @analytics&.event('Plan', 'call_function', label: function)
end

#report_noop_mode(noop) ⇒ Object



245
246
247
# File 'lib/bolt/executor.rb', line 245

def report_noop_mode(noop)
  @analytics&.event('Task', 'noop', label: (!!noop).to_s)
end

#report_yaml_plan(plan) ⇒ Object



261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
# File 'lib/bolt/executor.rb', line 261

def report_yaml_plan(plan)
  steps = plan.steps.count
  return_type = case plan.return
                when Bolt::PAL::YamlPlan::EvaluableString
                  'expression'
                when nil
                  nil
                else
                  'value'
                end

  @analytics&.event('Plan', 'yaml', plan_steps: steps, return_type: return_type)
rescue StandardError => e
  @logger.trace { "Failed to submit analytics event: #{e.message}" }
end

#round_robinObject



403
404
405
# File 'lib/bolt/executor.rb', line 403

def round_robin
  @fiber_executor.round_robin
end

#run_command(targets, command, options = {}, position = []) ⇒ Object



286
287
288
289
290
291
292
293
294
295
296
297
# File 'lib/bolt/executor.rb', line 286

def run_command(targets, command, options = {}, position = [])
  description = options.fetch(:description, "command '#{command}'")
  log_action(description, targets) do
    options[:run_as] = run_as if run_as && !options.key?(:run_as)

    batch_execute(targets) do |transport, batch|
      with_node_logging("Running command '#{command}'", batch) do
        transport.batch_command(batch, command, options, position, &method(:publish_event))
      end
    end
  end
end

#run_in_threadObject

Execute a plan function concurrently. This function accepts the executor function to be run and the parameters to pass to it, and returns the result of running the executor function.



423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
# File 'lib/bolt/executor.rb', line 423

def run_in_thread
  require 'concurrent'
  require 'fiber'
  future = Concurrent::Future.execute do
    yield
  end

  # Used to track how often we resume the same executor function
  still_running = 0
  # While the thread is still running
  while future.incomplete?
    # If the Fiber gets resumed, increment the resume tracker. This means
    # the tracker starts at 1 since it needs to increment before yielding,
    # since it can't yield then increment.
    still_running += 1
    # If the Fiber has been resumed before, still_running will be 2 or
    # more. Yield different values for when the same Fiber is resumed
    # multiple times and when it's resumed the first time in order to know
    # if progress was made in the plan.
    Fiber.yield(still_running < 2 ? :something_happened : :returned_immediately)
  end

  # Once the thread completes, return the result.
  future.value || future.reason
end

#run_plan(scope, plan, params) ⇒ Object



379
380
381
# File 'lib/bolt/executor.rb', line 379

def run_plan(scope, plan, params)
  plan.call_by_name_with_scope(scope, params, true)
end

#run_script(targets, script, arguments, options = {}, position = []) ⇒ Object



299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
# File 'lib/bolt/executor.rb', line 299

def run_script(targets, script, arguments, options = {}, position = [])
  description = options.fetch(:description, "script #{script}")
  log_action(description, targets) do
    options[:run_as] = run_as if run_as && !options.key?(:run_as)
    options[:script_interpreter] = (future || {}).fetch('script_interpreter', false)

    @analytics&.event('Future', 'script_interpreter', label: options[:script_interpreter].to_s)

    batch_execute(targets) do |transport, batch|
      with_node_logging("Running script #{script} with '#{arguments.to_json}'", batch) do
        transport.batch_script(batch, script, arguments, options, position, &method(:publish_event))
      end
    end
  end
end

#run_task(targets, task, arguments, options = {}, position = [], log_level = :info) ⇒ Object



315
316
317
318
319
320
321
322
323
324
325
326
327
# File 'lib/bolt/executor.rb', line 315

def run_task(targets, task, arguments, options = {}, position = [], log_level = :info)
  description = options.fetch(:description, "task #{task.name}")
  log_action(description, targets) do
    options[:run_as] = run_as if run_as && !options.key?(:run_as)
    arguments['_task'] = task.name

    batch_execute(targets) do |transport, batch|
      with_node_logging("Running task #{task.name} with '#{arguments.to_json}'", batch, log_level) do
        transport.batch_task(batch, task, arguments, options, position, &method(:publish_event))
      end
    end
  end
end

#run_task_with(target_mapping, task, options = {}, position = []) ⇒ Object



329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
# File 'lib/bolt/executor.rb', line 329

def run_task_with(target_mapping, task, options = {}, position = [])
  targets = target_mapping.keys
  description = options.fetch(:description, "task #{task.name}")

  log_action(description, targets) do
    options[:run_as] = run_as if run_as && !options.key?(:run_as)
    target_mapping.each_value { |arguments| arguments['_task'] = task.name }

    batch_execute(targets) do |transport, batch|
      with_node_logging("Running task #{task.name}'", batch) do
        transport.batch_task_with(batch, task, target_mapping, options, position, &method(:publish_event))
      end
    end
  end
end

#shutdownObject



116
117
118
119
# File 'lib/bolt/executor.rb', line 116

def shutdown
  @publisher.shutdown
  @publisher.wait_for_termination
end

#start_plan(plan_context) ⇒ Object

Plan context doesn’t make sense for most transports but it is tightly coupled with the orchestrator transport since the transport behaves differently when a plan is running. In order to limit how much this pollutes the transport API we only handle the orchestrator transport here. Since we call this function without resolving targets this will result in the orchestrator transport always being initialized during plan runs. For now that’s ok.

In the future if other transports need this or if we want a plan stack we’ll need to refactor.



522
523
524
# File 'lib/bolt/executor.rb', line 522

def start_plan(plan_context)
  transport('pcp').plan_context = plan_context
end

#subscribe(subscriber, types = nil) ⇒ Object



90
91
92
93
# File 'lib/bolt/executor.rb', line 90

def subscribe(subscriber, types = nil)
  @subscribers[subscriber] = types
  self
end

#transport(transport) ⇒ Object



82
83
84
85
86
87
88
# File 'lib/bolt/executor.rb', line 82

def transport(transport)
  impl = @transports[transport || 'ssh']
  raise(Bolt::UnknownTransportError, transport) unless impl
  # If there was an error creating the transport, ensure it gets thrown
  impl.no_error!
  impl.value
end

#unsubscribe(subscriber, types = nil) ⇒ Object



95
96
97
98
99
100
101
# File 'lib/bolt/executor.rb', line 95

def unsubscribe(subscriber, types = nil)
  if types.nil? || types.sort == @subscribers[subscriber]&.sort
    @subscribers.delete(subscriber)
  elsif @subscribers[subscriber].is_a?(Array)
    @subscribers[subscriber] = @subscribers[subscriber] - types
  end
end

#upload_file(targets, source, destination, options = {}, position = []) ⇒ Object



345
346
347
348
349
350
351
352
353
354
355
356
# File 'lib/bolt/executor.rb', line 345

def upload_file(targets, source, destination, options = {}, position = [])
  description = options.fetch(:description, "file upload from #{source} to #{destination}")
  log_action(description, targets) do
    options[:run_as] = run_as if run_as && !options.key?(:run_as)

    batch_execute(targets) do |transport, batch|
      with_node_logging("Uploading file #{source} to #{destination}", batch) do
        transport.batch_upload(batch, source, destination, options, position, &method(:publish_event))
      end
    end
  end
end

#wait(futures, **opts) ⇒ Object



411
412
413
# File 'lib/bolt/executor.rb', line 411

def wait(futures, **opts)
  @fiber_executor.wait(futures, **opts)
end

#wait_until_available(targets, description: 'wait until available', wait_time: 120, retry_interval: 1) ⇒ Object



451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
# File 'lib/bolt/executor.rb', line 451

def wait_until_available(targets,
                         description: 'wait until available',
                         wait_time: 120,
                         retry_interval: 1)
  log_action(description, targets) do
    batch_execute(targets) do |transport, batch|
      with_node_logging('Waiting until available', batch) do
        wait_until(wait_time, retry_interval) { transport.batch_connected?(batch) }
        batch.map { |target| Result.new(target, action: 'wait_until_available', object: description) }
      rescue TimeoutError => e
        available, unavailable = batch.partition { |target| transport.batch_connected?([target]) }
        (
          available.map { |target| Result.new(target, action: 'wait_until_available', object: description) } +
          unavailable.map { |target| Result.from_exception(target, e, action: 'wait_until_available') }
        )
      end
    end
  end
end

#with_node_logging(description, batch, log_level = :info) ⇒ Object



277
278
279
280
281
282
283
284
# File 'lib/bolt/executor.rb', line 277

def with_node_logging(description, batch, log_level = :info)
  @logger.send(log_level, "#{description} on #{batch.map(&:safe_name)}")
  publish_event(type: :start_spin)
  result = yield
  publish_event(type: :stop_spin)
  @logger.send(log_level, result.to_json)
  result
end

#without_default_loggingObject



530
531
532
533
534
535
# File 'lib/bolt/executor.rb', line 530

def without_default_logging
  publish_event(type: :disable_default_output)
  yield
ensure
  publish_event(type: :enable_default_output)
end