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

FIXME: There must be a better way makandracards.com/makandra/36011-ruby-do-not-mix-optional-and-keyword-arguments



21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
 
# File 'lib/bolt/executor.rb', line 21

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 = Set.new
  @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.



16
17
18
 
# File 'lib/bolt/executor.rb', line 16

def noop
  @noop
end

#run_as ⇒ Object

Returns the value of attribute run_as.



17
18
19
 
# File 'lib/bolt/executor.rb', line 17

def run_as
  @run_as
end

#transports ⇒ Object (readonly)

Returns the value of attribute transports.



16
17
18
 
# File 'lib/bolt/executor.rb', line 16

def transports
  @transports
end

Instance Method Details

#await_results(promises) ⇒ Object

Create a ResultSet from the results of all promises.



133
134
135
 
# File 'lib/bolt/executor.rb', line 133

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.



144
145
146
147
 
# File 'lib/bolt/executor.rb', line 144

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

#finish_plan(plan_result) ⇒ Object 



333
334
335
 
# File 'lib/bolt/executor.rb', line 333

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

#log_action(description, targets) ⇒ Object 



149
150
151
152
153
154
155
156
157
158
159
 
# File 'lib/bolt/executor.rb', line 149

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 



161
162
163
164
165
166
167
168
169
170
171
172
173
174
 
# File 'lib/bolt/executor.rb', line 161

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

#publish_event(event) ⇒ Object 



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

def publish_event(event)
  @subscribers.each do |subscriber|
    @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.



88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
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
 
# File 'lib/bolt/executor.rb', line 88

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|
        begin
          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
      end
      batch_promises.values
    end
  end
end

#report_apply(statement_count, resource_counts) ⇒ Object 



194
195
196
197
198
199
200
201
202
203
204
 
# File 'lib/bolt/executor.rb', line 194

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 



188
189
190
191
192
 
# File 'lib/bolt/executor.rb', line 188

def report_bundled_content(mode, name)
  if @analytics.bundled_content&.include?(name)
    @analytics&.event('Bundled Content', mode, label: name)
  end
end

#report_function_call(function) ⇒ Object 



184
185
186
 
# File 'lib/bolt/executor.rb', line 184

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

#report_transport(transport, count) ⇒ Object 



176
177
178
179
180
181
182
 
# File 'lib/bolt/executor.rb', line 176

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 



206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
 
# File 'lib/bolt/executor.rb', line 206

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 



229
230
231
232
233
234
235
236
237
238
239
240
 
# File 'lib/bolt/executor.rb', line 229

def run_command(targets, command, options = {})
  description = options.fetch('_description', "command '#{command}'")
  log_action(description, targets) do
    options = { '_run_as' => run_as }.merge(options) if 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_script(targets, script, arguments, options = {}) ⇒ Object 



242
243
244
245
246
247
248
249
250
251
252
253
 
# File 'lib/bolt/executor.rb', line 242

def run_script(targets, script, arguments, options = {})
  description = options.fetch('_description', "script #{script}")
  log_action(description, targets) do
    options = { '_run_as' => run_as }.merge(options) if run_as

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

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



255
256
257
258
259
260
261
262
263
264
265
266
267
 
# File 'lib/bolt/executor.rb', line 255

def run_task(targets, task, arguments, options = {})
  description = options.fetch('_description', "task #{task.name}")
  log_action(description, targets) do
    options = { '_run_as' => run_as }.merge(options) if run_as
    arguments['_task'] = task.name

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

#shutdown ⇒ Object 



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

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.



329
330
331
 
# File 'lib/bolt/executor.rb', line 329

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

#subscribe(subscriber) ⇒ Object 



64
65
66
67
 
# File 'lib/bolt/executor.rb', line 64

def subscribe(subscriber)
  @subscribers << subscriber
  self
end

#transport(transport) ⇒ Object

Raises:



56
57
58
59
60
61
62
 
# File 'lib/bolt/executor.rb', line 56

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 



269
270
271
272
273
274
275
276
277
278
279
280
 
# File 'lib/bolt/executor.rb', line 269

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 }.merge(options) if 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 



311
312
313
314
315
316
317
 
# File 'lib/bolt/executor.rb', line 311

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 



284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
 
# File 'lib/bolt/executor.rb', line 284

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
        begin
          wait_until(wait_time, retry_interval) { transport.batch_connected?(batch) }
          batch.map { |target| Result.new(target) }
        rescue TimeoutError => e
          available, unavailable = batch.partition { |target| transport.batch_connected?([target]) }
          (
            available.map { |target| Result.new(target) } +
            unavailable.map { |target| Result.from_exception(target, e) }
          )
        end
      end
    end
  end
end

#with_node_logging(description, batch) ⇒ Object 



222
223
224
225
226
227
 
# File 'lib/bolt/executor.rb', line 222

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

#without_default_logging ⇒ Object 



337
338
339
340
341
342
 
# File 'lib/bolt/executor.rb', line 337

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