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) ⇒ Executor

Returns a new instance of Executor.



35
36
37
38
39
40
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
 
# File 'lib/bolt/executor.rb', line 35

def initialize(concurrency = 1,
               analytics = Bolt::Analytics::NoopClient.new,
               noop = false)
  # lazy-load expensive gem code
  require 'concurrent'

  @analytics = analytics
  @logger = Logging.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

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

Instance Attribute Details

#noop ⇒ Object (readonly)

Returns the value of attribute noop.



32
33
34
 
# File 'lib/bolt/executor.rb', line 32

def noop
  @noop
end

#run_as ⇒ Object

Returns the value of attribute run_as.



33
34
35
 
# File 'lib/bolt/executor.rb', line 33

def run_as
  @run_as
end

#transports ⇒ Object (readonly)

Returns the value of attribute transports.



32
33
34
 
# File 'lib/bolt/executor.rb', line 32

def transports
  @transports
end

Instance Method Details

#await_results(promises) ⇒ Object

Create a ResultSet from the results of all promises.



147
148
149
 
# File 'lib/bolt/executor.rb', line 147

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.



158
159
160
161
 
# File 'lib/bolt/executor.rb', line 158

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

#finish_plan(plan_result) ⇒ Object 



381
382
383
 
# File 'lib/bolt/executor.rb', line 381

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

#log_action(description, targets) ⇒ Object 



163
164
165
166
167
168
169
170
171
172
173
 
# File 'lib/bolt/executor.rb', line 163

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 



175
176
177
178
179
180
181
182
183
184
185
186
187
188
 
# File 'lib/bolt/executor.rb', line 175

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

#prompt(prompt, options) ⇒ Object 



349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
 
# File 'lib/bolt/executor.rb', line 349

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

  STDERR.print("#{prompt}: ")

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

  STDERR.puts if options[:sensitive]

  value
end

#publish_event(event) ⇒ Object 



82
83
84
85
86
87
88
89
90
91
 
# File 'lib/bolt/executor.rb', line 82

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|
      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.



104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
 
# File 'lib/bolt/executor.rb', line 104

def queue_execute(targets)
  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|
        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 



206
207
208
209
210
211
212
213
214
215
216
 
# File 'lib/bolt/executor.rb', line 206

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 



202
203
204
 
# File 'lib/bolt/executor.rb', line 202

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

#report_function_call(function) ⇒ Object 



198
199
200
 
# File 'lib/bolt/executor.rb', line 198

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

#report_transport(transport, count) ⇒ Object 



190
191
192
193
194
195
196
 
# File 'lib/bolt/executor.rb', line 190

def report_transport(transport, count)
  name = transport.class.name.split('::').last.downcase
  unless @reported_transports.include?(name)
    @analytics&.event('Transport', 'initialize', label: name, value: count)
  end
  @reported_transports.add(name)
end

#report_yaml_plan(plan) ⇒ Object 



218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
 
# File 'lib/bolt/executor.rb', line 218

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.debug { "Failed to submit analytics event: #{e.message}" }
end

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



241
242
243
244
245
246
247
248
249
250
251
252
 
# File 'lib/bolt/executor.rb', line 241

def run_command(targets, command, options = {})
  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, &method(:publish_event))
      end
    end
  end
end

#run_plan(scope, plan, params) ⇒ Object 



310
311
312
 
# File 'lib/bolt/executor.rb', line 310

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

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



254
255
256
257
258
259
260
261
262
263
264
265
 
# File 'lib/bolt/executor.rb', line 254

def run_script(targets, script, arguments, options = {})
  description = options.fetch(:description, "script #{script}")
  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 script #{script} with '#{arguments.to_json}'", batch) do
        transport.batch_script(batch, script, arguments, options, &method(:publish_event))
      end
    end
  end
end

#run_task(targets, task, arguments, options = {}) ⇒ Object 



267
268
269
270
271
272
273
274
275
276
277
278
279
 
# File 'lib/bolt/executor.rb', line 267

def run_task(targets, task, arguments, options = {})
  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) do
        transport.batch_task(batch, task, arguments, options, &method(:publish_event))
      end
    end
  end
end

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



281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
 
# File 'lib/bolt/executor.rb', line 281

def run_task_with(target_mapping, task, options = {})
  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, &method(:publish_event))
      end
    end
  end
end

#shutdown ⇒ Object 



93
94
95
96
 
# File 'lib/bolt/executor.rb', line 93

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 callt 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.



377
378
379
 
# File 'lib/bolt/executor.rb', line 377

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

#subscribe(subscriber, types = nil) ⇒ Object 



77
78
79
80
 
# File 'lib/bolt/executor.rb', line 77

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

#transport(transport) ⇒ Object

Raises:



69
70
71
72
73
74
75
 
# File 'lib/bolt/executor.rb', line 69

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

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



297
298
299
300
301
302
303
304
305
306
307
308
 
# File 'lib/bolt/executor.rb', line 297

def upload_file(targets, source, destination, options = {})
  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, &method(:publish_event))
      end
    end
  end
end

#wait_until(timeout, retry_interval) ⇒ Object 



341
342
343
344
345
346
347
 
# File 'lib/bolt/executor.rb', line 341

def wait_until(timeout, retry_interval)
  start = wait_now
  until yield
    raise(TimeoutError, 'Timed out waiting for target') if (wait_now - start).to_i >= timeout
    sleep(retry_interval)
  end
end

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



316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
 
# File 'lib/bolt/executor.rb', line 316

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) ⇒ Object 



234
235
236
237
238
239
 
# File 'lib/bolt/executor.rb', line 234

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

#without_default_logging ⇒ Object 



385
386
387
388
389
390
 
# File 'lib/bolt/executor.rb', line 385

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