Class: Chef::Runner

Inherits:
Object
  • Object
show all
Includes:
Mixin::ParamsValidate
Defined in:
lib/chef/runner.rb

Overview

Chef::Runner

This class is responsible for executing the steps in a Chef run.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Mixin::ParamsValidate

#lazy, #set_or_return, #validate

Constructor Details

#initialize(run_context) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/chef/runner.rb', line 35

def initialize(run_context)
  @run_context = run_context
  @run_context.runner = self
end

Instance Attribute Details

#run_context ⇒ Object (readonly)

Returns the value of attribute run_context.



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# File 'lib/chef/runner.rb', line 31

def run_context
  @run_context
end

Instance Method Details

#converge ⇒ Object

Iterates over the resource_collection in the run_context calling run_action for each resource in turn.



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# File 'lib/chef/runner.rb', line 125

def converge
  # Resolve all lazy/forward references in notifications
  run_context.resource_collection.each(&:resolve_notification_references)

  # Execute each resource.
  run_context.resource_collection.execute_each_resource do |resource|
    unless run_context.resource_collection.unified_mode
      run_all_actions(resource)
    end
  end

  if run_context.resource_collection.unified_mode
    run_context.resource_collection.each { |r| r.resolve_notification_references(true) }
  end

rescue Exception => e
  Chef::Log.info "Running queued delayed notifications before re-raising exception"
  run_delayed_notifications(e)
else
  run_delayed_notifications(nil)
  true
end

#delayed_actions ⇒ Object 



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# File 'lib/chef/runner.rb', line 40

def delayed_actions
  @run_context.delayed_actions
end

#events ⇒ Object 



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# File 'lib/chef/runner.rb', line 44

def events
  @run_context.events
end

#run_action(resource, action, notification_type = nil, notifying_resource = nil) ⇒ Object

Determine the appropriate provider for the given resource, then execute it.



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# File 'lib/chef/runner.rb', line 54

def run_action(resource, action, notification_type = nil, notifying_resource = nil)
  # If there are any before notifications, why-run the resource
  # and notify anyone who needs notifying
  before_notifications = run_context.before_notifications(resource) || []
  unless before_notifications.empty?
    forced_why_run do
      Chef::Log.info("#{resource} running why-run #{action} action to support before action")
      resource.run_action(action, notification_type, notifying_resource)
    end

    if resource.updated_by_last_action?
      before_notifications.each do |notification|
        Chef::Log.info("#{resource} sending #{notification.action} action to #{notification.resource} (before)")
        run_action(notification.resource, notification.action, :before, resource)
      end
      resource.updated_by_last_action(false)
    end
  end

  # Run the action on the resource.
  resource.run_action(action, notification_type, notifying_resource)

  # Execute any immediate and queue up any delayed notifications
  # associated with the resource, but only if it was updated *this time*
  # we ran an action on it.
  if resource.updated_by_last_action?
    updated_resources.add(resource.declared_key) # track updated resources for unified_mode
    run_context.immediate_notifications(resource).each do |notification|
      if notification.resource.is_a?(String) && run_context.unified_mode
        Chef::Log.debug("immediate notification from #{resource} to #{notification.resource} is delayed until declaration due to unified_mode")
      else
        Chef::Log.info("#{resource} sending #{notification.action} action to #{notification.resource} (immediate)")
        run_action(notification.resource, notification.action, :immediate, resource)
      end
    end

    run_context.delayed_notifications(resource).each do |notification|
      if notification.resource.is_a?(String)
        # for string resources that have not be declared yet in unified mode we only support notifying the current run_context
        run_context.add_delayed_action(notification)
      else
        # send the notification to the run_context of the receiving resource
        notification.resource.run_context.add_delayed_action(notification)
      end
    end
  end
end

#run_all_actions(resource) ⇒ Object

Runs all of the actions on a given resource. This fires notifications and marks the resource as having been executed by the runner.

Parameters:



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# File 'lib/chef/runner.rb', line 107

def run_all_actions(resource)
  Array(resource.action).each { |action| run_action(resource, action) }
  if run_context.unified_mode
    run_context.reverse_immediate_notifications(resource).each do |n|
      if updated_resources.include?(n.notifying_resource.declared_key)
        n.resolve_resource_reference(run_context.resource_collection)
        Chef::Log.info("#{resource} sent #{n.action} action to #{n.resource} (immediate at declaration time)")
        run_action(n.resource, n.action, :immediate, n.notifying_resource)
      end
    end
  end
ensure
  resource.executed_by_runner = true
end

#updated_resources ⇒ Object 



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# File 'lib/chef/runner.rb', line 48

def updated_resources
  @run_context.updated_resources
end