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) ⇒ Executor

Returns a new instance of Executor.



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# File 'lib/bolt/executor.rb', line 36

def initialize(concurrency = 1,
               analytics = Bolt::Analytics::NoopClient.new,
               noop = false,
               modified_concurrency = false)
  # 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
  @in_parallel = false
  @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
end

Instance Attribute Details

#in_parallel ⇒ Object (readonly)

Returns the value of attribute in_parallel.



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

def in_parallel
  @in_parallel
end

#noop ⇒ Object (readonly)

Returns the value of attribute noop.



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

def noop
  @noop
end

#run_as ⇒ Object

Returns the value of attribute run_as.



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

def run_as
  @run_as
end

#transports ⇒ Object (readonly)

Returns the value of attribute transports.



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

def transports
  @transports
end

Instance Method Details

#await_results(promises) ⇒ Object

Create a ResultSet from the results of all promises.



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# File 'lib/bolt/executor.rb', line 175

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.



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

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

#create_yarn(scope, block, object, index) ⇒ Object 



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# File 'lib/bolt/executor.rb', line 365

def create_yarn(scope, block, object, index)
  fiber = Fiber.new do
    # Create the new scope
    newscope = Puppet::Parser::Scope.new(scope.compiler)
    local = Puppet::Parser::Scope::LocalScope.new

    # Compress the current scopes into a single vars hash to add to the new scope
    current_scope = scope.effective_symtable(true)
    until current_scope.nil?
      current_scope.instance_variable_get(:@symbols)&.each_pair { |k, v| local[k] = v }
      current_scope = current_scope.parent
    end
    newscope.push_ephemerals([local])

    begin
      result = catch(:return) do
        args = { block.parameters[0][1].to_s => object }
        block.closure.call_by_name_with_scope(newscope, args, true)
      end

      # If we got a return from the block, get it's value
      # Otherwise the result is the last line from the block
      result = result.value if result.is_a?(Puppet::Pops::Evaluator::Return)

      # Validate the result is a PlanResult
      unless Puppet::Pops::Types::TypeParser.singleton.parse('Boltlib::PlanResult').instance?(result)
        raise Bolt::InvalidParallelResult.new(result.to_s, *Puppet::Pops::PuppetStack.top_of_stack)
      end

      result
    rescue Puppet::PreformattedError => e
      if e.cause.is_a?(Bolt::Error)
        e.cause
      else
        raise e
      end
    end
  end

  Bolt::Yarn.new(fiber, index)
end

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



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# File 'lib/bolt/executor.rb', line 340

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 



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# File 'lib/bolt/executor.rb', line 513

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

#handle_event(event) ⇒ Object 



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

def handle_event(event)
  case event[:type]
  when :node_result
    @thread_completed = true
  end
end

#log_action(description, targets) ⇒ Object 



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# File 'lib/bolt/executor.rb', line 191

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 



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

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 



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# File 'lib/bolt/executor.rb', line 479

def prompt(prompt, options)
  @prompting = true
  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
  @prompting = false

  $stderr.puts if options[:sensitive]

  value
end

#publish_event(event) ⇒ Object 



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# File 'lib/bolt/executor.rb', line 97

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.



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# File 'lib/bolt/executor.rb', line 121

def queue_execute(targets)
  if @warn_concurrency && targets.length > @concurrency
    @warn_concurrency = false
    msg = "The ulimit is low, which may cause file limit issues. Default concurrency has been set to "\
          "'#{@concurrency}' to mitigate those issues, which may 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 



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

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 



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# File 'lib/bolt/executor.rb', line 230

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

#report_function_call(function) ⇒ Object 



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# File 'lib/bolt/executor.rb', line 226

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

#report_transport(transport, count) ⇒ Object 



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# File 'lib/bolt/executor.rb', line 218

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 



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

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_robin(skein) ⇒ Object 



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# File 'lib/bolt/executor.rb', line 414

def round_robin(skein)
  subscribe(self, [:node_result])
  results = Array.new(skein.length)
  @in_parallel = true
  publish_event(type: :stop_spin)

  until skein.empty?
    @thread_completed = false
    r = nil

    skein.each do |yarn|
      if yarn.alive?
        publish_event(type: :stop_spin)
        r = yarn.resume
      else
        results[yarn.index] = yarn.value
        skein.delete(yarn)
      end
    end

    next unless r == 'unfinished'
    sleep(0.1) until @thread_completed || skein.empty?
  end

  publish_event(type: :stop_spin)
  @in_parallel = false
  unsubscribe(self, [:node_result])
  results
end

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



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# File 'lib/bolt/executor.rb', line 271

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_plan(scope, plan, params) ⇒ Object 



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# File 'lib/bolt/executor.rb', line 361

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

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



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# File 'lib/bolt/executor.rb', line 284

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)

    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 



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# File 'lib/bolt/executor.rb', line 297

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 



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

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

#shutdown ⇒ Object 



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# File 'lib/bolt/executor.rb', line 110

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.



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# File 'lib/bolt/executor.rb', line 509

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

#subscribe(subscriber, types = nil) ⇒ Object 



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# File 'lib/bolt/executor.rb', line 84

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

#transport(transport) ⇒ Object

Raises:



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# File 'lib/bolt/executor.rb', line 76

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 



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# File 'lib/bolt/executor.rb', line 89

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 



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# File 'lib/bolt/executor.rb', line 327

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_until(timeout, retry_interval) ⇒ Object 



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# File 'lib/bolt/executor.rb', line 471

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 



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# File 'lib/bolt/executor.rb', line 446

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 



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# File 'lib/bolt/executor.rb', line 262

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_logging ⇒ Object 



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# File 'lib/bolt/executor.rb', line 517

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