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#--
# Author:: Adam Jacob (<adam@chef.io>)
# Author:: Christopher Walters (<cw@chef.io>)
# Author:: Tim Hinderliter (<tim@chef.io>)
# Copyright:: Copyright (c) Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require_relative "exceptions"
require_relative "mixin/params_validate"
require_relative "node"
require_relative "resource_collection"
class Chef
# == Chef::Runner
# This class is responsible for executing the steps in a Chef run.
class Runner
attr_reader :run_context
include Chef::Mixin::ParamsValidate
def initialize(run_context)
@run_context = run_context
@run_context.runner = self
end
def delayed_actions
@run_context.delayed_actions
end
def events
@run_context.events
end
def updated_resources
@run_context.updated_resources
end
# Determine the appropriate provider for the given resource, then
# execute it.
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
# Actually run the action for releases
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
# Runs all of the actions on a given resource. This fires notifications and marks
# the resource as having been executed by the runner.
#
# @param resource [Chef::Resource] the resource to run
#
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
# Iterates over the resource_collection in the run_context calling
# run_action for each resource in turn.
#
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
private
# Run all our :delayed actions
def run_delayed_notifications(error = nil)
collected_failures = Exceptions::MultipleFailures.new
collected_failures.client_run_failure(error) unless error.nil?
delayed_actions.each do |notification|
result = run_delayed_notification(notification)
if result.is_a?(Exception)
collected_failures.notification_failure(result)
end
end
collected_failures.raise!
end
def run_delayed_notification(notification)
Chef::Log.info( "#{notification.notifying_resource} sending #{notification.action}"\
" action to #{notification.resource} (delayed)")
# notifications may have lazy strings in them to resolve
notification.resolve_resource_reference(run_context.resource_collection)
run_action(notification.resource, notification.action, :delayed)
true
rescue Exception => e
e
end
# helper to run a block of code with why_run forced to true and then restore it correctly
def forced_why_run
saved = Chef::Config[:why_run]
Chef::Config[:why_run] = true
yield
ensure
Chef::Config[:why_run] = saved
end
end
end
|
