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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
#
# 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, override: 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 = {}
filters[:platform] = platform if platform
filters[:platform_version] = platform_version if platform_version
filters[:platform_family] = platform_family if platform_family
filters[:os] = os if os
new_matcher = { value: value, filters: filters }
new_matcher[:block] = block if block
new_matcher[:canonical] = canonical if canonical
new_matcher[:override] = override if override
# The map is sorted in order of preference already; we just need to find
# our place in it (just before the first value with the same preference level).
insert_at = nil
map[key] ||= []
map[key].each_with_index do |matcher,index|
cmp = compare_matchers(key, new_matcher, matcher)
insert_at ||= index if cmp && cmp <= 0
end
if insert_at
map[key].insert(insert_at, new_matcher)
else
map[key] << new_matcher
end
map
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
# @param canonical [Boolean] `true` or `false` to match canonical or
# non-canonical values only. `nil` to ignore canonicality. Default: `nil`
#
# @return [Object] Value
#
def get(node, key, canonical: nil)
raise ArgumentError, "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
# @param canonical [Boolean] `true` or `false` to match canonical or
# non-canonical values only. `nil` to ignore canonicality. Default: `nil`
#
# @return [Object] Value
#
def list(node, key, canonical: nil)
raise ArgumentError, "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_matches?(node, matcher) && canonical_matches?(canonical, matcher)
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, value)
remaining = map[key]
if remaining
remaining.delete_if { |matcher| matcher[:canonical] && Array(matcher[:value]) == Array(value) }
if remaining.empty?
map.delete(key)
remaining = nil
end
end
remaining
end
protected
#
# 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
def node_matches?(node, matcher)
return true if !node
filters_match?(node, matcher[:filters]) && block_matches?(node, matcher[:block])
end
def canonical_matches?(canonical, matcher)
return true if canonical.nil?
!!canonical == !!matcher[:canonical]
end
def compare_matchers(key, new_matcher, matcher)
cmp = compare_matcher_properties(new_matcher, matcher) { |m| m[:block] }
return cmp if cmp != 0
cmp = compare_matcher_properties(new_matcher, matcher) { |m| m[:filters][:platform_version] }
return cmp if cmp != 0
cmp = compare_matcher_properties(new_matcher, matcher) { |m| m[:filters][:platform] }
return cmp if cmp != 0
cmp = compare_matcher_properties(new_matcher, matcher) { |m| m[:filters][:platform_family] }
return cmp if cmp != 0
cmp = compare_matcher_properties(new_matcher, matcher) { |m| m[:filters][:os] }
return cmp if cmp != 0
cmp = compare_matcher_properties(new_matcher, matcher) { |m| m[:override] }
return cmp if cmp != 0
# If all things are identical, return 0
0
end
def compare_matcher_properties(new_matcher, matcher)
a = yield(new_matcher)
b = yield(matcher)
# Check for blcacklists ('!windows'). Those always come *after* positive
# whitelists.
a_negated = Array(a).any? { |f| f.is_a?(String) && f.start_with?('!') }
b_negated = Array(b).any? { |f| f.is_a?(String) && f.start_with?('!') }
if a_negated != b_negated
return 1 if a_negated
return -1 if b_negated
end
# We treat false / true and nil / not-nil with the same comparison
a = nil if a == false
b = nil if b == false
cmp = a <=> b
# This is the case where one is non-nil, and one is nil. The one that is
# nil is "greater" (i.e. it should come last).
if cmp.nil?
return 1 if a.nil?
return -1 if b.nil?
end
cmp
end
def map
@map ||= {}
end
end
end
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