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require 'json/pure'
module LeapCli
module Config
#
# A class to manage all the objects in all the configuration files.
#
class Manager
attr_reader :services, :tags, :nodes, :provider, :common
##
## IMPORT EXPORT
##
#
# load .json configuration files
#
def load(provider_dir=Path.provider)
@services = load_all_json(Path.named_path([:service_config, '*'], provider_dir))
@tags = load_all_json(Path.named_path([:tag_config, '*'], provider_dir))
@nodes = load_all_json(Path.named_path([:node_config, '*'], provider_dir))
@common = load_json(Path.named_path(:common_config, provider_dir))
@provider = load_json(Path.named_path(:provider_config, provider_dir))
Util::assert!(@provider, "Failed to load provider.json")
Util::assert!(@common, "Failed to load common.json")
@nodes.each do |name, node|
@nodes[name] = apply_inheritance(node)
end
end
#
# save compiled hiera .yaml files
#
def export(dir=Path.named_path(:hiera_dir))
existing_files = Dir.glob(dir + '/*.yaml')
updated_files = []
@nodes.each do |name, node|
filepath = "#{dir}/#{name}.yaml"
updated_files << filepath
Util::write_file!(filepath, node.dump)
end
(existing_files - updated_files).each do |filepath|
Util::remove_file!(filepath)
end
end
##
## FILTERING
##
#
# returns a node list consisting only of nodes that satisfy the filter criteria.
#
# filter: condition [condition] [condition] [+condition]
# condition: [node_name | service_name | tag_name]
#
# if conditions is prefixed with +, then it works like an AND. Otherwise, it works like an OR.
#
def filter(filters)
if filters.empty?
return nodes
end
if filters[0] =~ /^\+/
# don't let the first filter have a + prefix
filters[0] = filters[0][1..-1]
end
node_list = Config::ObjectList.new
filters.each do |filter|
if filter =~ /^\+/
keep_list = nodes_for_name(filter[1..-1])
node_list.delete_if do |name, node|
if keep_list[name]
false
else
true
end
end
else
node_list.merge!(nodes_for_name(filter))
end
end
return node_list
end
#
# same as filter(), but exits if there is no matching nodes
#
def filter!(filters)
node_list = filter(filters)
Util::assert! node_list.any?, "Could not match any nodes from '#{filters}'"
return node_list
end
#
# returns a single Config::Object that corresponds to a Node.
#
def node(name)
nodes[name]
end
private
def load_all_json(pattern)
results = Config::ObjectList.new
Dir.glob(pattern).each do |filename|
obj = load_json(filename)
if obj
name = File.basename(filename).sub(/\.json$/,'')
obj['name'] ||= name
results[name] = obj
end
end
results
end
def load_json(filename)
#
# read file, strip out comments
# (File.read(filename) would be faster, but we like ability to have comments)
#
buffer = StringIO.new
File.open(filename) do |f|
while (line = f.gets)
next if line =~ /^\s*#/
buffer << line
end
end
# parse json
begin
hash = JSON.parse(buffer.string, :object_class => Hash, :array_class => Array) || {}
rescue SyntaxError => exc
log0 'Error in file "%s":' % filename
log0 exc.to_s
return nil
end
object = Config::Object.new(self)
object.deep_merge!(hash)
return object
end
#
# remove all the nesting from a hash.
#
# def flatten_hash(input = {}, output = {}, options = {})
# input.each do |key, value|
# key = options[:prefix].nil? ? "#{key}" : "#{options[:prefix]}#{options[:delimiter]||"_"}#{key}"
# if value.is_a? Hash
# flatten_hash(value, output, :prefix => key, :delimiter => options[:delimiter])
# else
# output[key] = value
# end
# end
# output.replace(input)
# output
# end
#
# makes a node inherit options from appropriate the common, service, and tag json files.
#
def apply_inheritance(node)
new_node = Config::Object.new(self)
name = node.name
# inherit from common
new_node.deep_merge!(@common)
# inherit from services
if node['services']
node['services'].to_a.sort.each do |node_service|
service = @services[node_service]
if service.nil?
log0('Error in node "%s": the service "%s" does not exist.' % [node['name'], node_service])
else
new_node.deep_merge!(service)
service.node_list.add(name, new_node)
end
end
end
# inherit from tags
if node['tags']
node['tags'].to_a.sort.each do |node_tag|
tag = @tags[node_tag]
if tag.nil?
log0('Error in node "%s": the tag "%s" does not exist.' % [node['name'], node_tag])
else
new_node.deep_merge!(tag)
tag.node_list.add(name, new_node)
end
end
end
# inherit from node
new_node.deep_merge!(node)
return new_node
end
#
# returns a set of nodes corresponding to a single name, where name could be a node name, service name, or tag name.
#
def nodes_for_name(name)
if node = self.nodes[name]
Config::ObjectList.new(node)
elsif service = self.services[name]
service.node_list
elsif tag = self.tags[name]
tag.node_list
else
{}
end
end
end
end
end
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