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#
# Author:: Lamont Granquist (<lamont@chef.io>)
# Copyright:: Copyright (c) 2014 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.
#
class Chef
class NodeMap
#
# Create a new NodeMap
#
def initialize
@map = {}
end
#
# Set a key/value pair on the map with a filter. The filter must be true
# when applied to the node in order to retrieve the value.
#
# @param key [Object] Key to store
# @param value [Object] Value associated with the key
# @param filters [Hash] Node filter options to apply to key retrieval
#
# @yield [node] Arbitrary node filter as a block which takes a node argument
#
# @return [NodeMap] Returns self for possible chaining
#
def set(key, value, platform: nil, platform_version: nil, platform_family: nil, os: nil, on_platform: nil, on_platforms: nil, canonical: nil, &block)
Chef::Log.deprecation "The on_platform option to node_map has been deprecated" if on_platform
Chef::Log.deprecation "The on_platforms option to node_map has been deprecated" if on_platforms
platform ||= on_platform || on_platforms
filters = { platform: platform, platform_version: platform_version, platform_family: platform_family, os: os }
new_matcher = { filters: filters, block: block, value: value, canonical: canonical }
@map[key] ||= []
# Decide where to insert the matcher; the new value is preferred over
# anything more specific (see `priority_of`) and is preferred over older
# values of the same specificity. (So all other things being equal,
# newest wins.)
insert_at = nil
@map[key].each_with_index do |matcher, index|
if specificity(new_matcher) >= specificity(matcher)
insert_at = index
break
end
end
if insert_at
@map[key].insert(insert_at, new_matcher)
else
@map[key] << new_matcher
end
self
end
#
# Get a value from the NodeMap via applying the node to the filters that
# were set on the key.
#
# @param node [Chef::Node] The Chef::Node object for the run, or `nil` to
# ignore all filters.
# @param key [Object] Key to look up
#
# @return [Object] Value
#
def get(node, key)
# FIXME: real exception
raise "first argument must be a Chef::Node" unless node.is_a?(Chef::Node) || node.nil?
list(node, key, canonical: canonical).first
end
#
# List all matches for the given node and key from the NodeMap, from
# most-recently added to oldest.
#
# @param node [Chef::Node] The Chef::Node object for the run, or `nil` to
# ignore all filters.
# @param key [Object] Key to look up
#
# @return [Object] Value
#
def list(node, key)
# FIXME: real exception
raise "first argument must be a Chef::Node" unless node.is_a?(Chef::Node) || node.nil?
return [] unless @map.has_key?(key)
@map[key].select do |matcher|
!node || (filters_match?(node, matcher[:filters]) && block_matches?(node, matcher[:block]))
end.map { |matcher| matcher[:value] }
end
# Seriously, don't use this, it's nearly certain to change on you
# @return remaining
# @api private
def delete_canonical(key)
remaining = @map[key]
if remaining
remaining.delete_if { |matcher| matcher[:canonical] }
if remaining.empty?
@map.delete(key)
remaining = nil
end
end
remaining
end
private
#
# Gives a value for "how specific" the matcher is.
# Things which specify more specific filters get a higher number
# (platform_version > platform > platform_family > os); things
# with a block have higher specificity than similar things without
# a block.
#
def specificity(matcher)
if matcher[:filters][:platform_version]
specificity = 8
elsif matcher[:filters][:platform]
specificity = 6
elsif matcher[:filters][:platform_family]
specificity = 4
elsif matcher[:filters][:os]
specificity = 2
else
specificity = 0
end
specificity += 1 if matcher[:block]
specificity
end
#
# Succeeds if:
# - no negative matches (!value)
# - at least one positive match (value or :all), or no positive filters
#
def matches_black_white_list?(node, filters, attribute)
# It's super common for the filter to be nil. Catch that so we don't
# spend any time here.
return true if !filters[attribute]
filter_values = Array(filters[attribute])
value = node[attribute]
# Split the blacklist and whitelist
blacklist, whitelist = filter_values.partition { |v| v.is_a?(String) && v.start_with?('!') }
# If any blacklist value matches, we don't match
return false if blacklist.any? { |v| v[1..-1] == value }
# If the whitelist is empty, or anything matches, we match.
whitelist.empty? || whitelist.any? { |v| v == :all || v == value }
end
def matches_version_list?(node, filters, attribute)
# It's super common for the filter to be nil. Catch that so we don't
# spend any time here.
return true if !filters[attribute]
filter_values = Array(filters[attribute])
value = node[attribute]
filter_values.empty? ||
Array(filter_values).any? do |v|
Chef::VersionConstraint::Platform.new(v).include?(value)
end
end
def filters_match?(node, filters)
matches_black_white_list?(node, filters, :os) &&
matches_black_white_list?(node, filters, :platform_family) &&
matches_black_white_list?(node, filters, :platform) &&
matches_version_list?(node, filters, :platform_version)
end
def block_matches?(node, block)
return true if block.nil?
block.call node
end
end
end
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