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require 'oj'
require 'yaml'
module LeapCli
class ConfigManager
attr_reader :services, :tags, :nodes
##
## IMPORT EXPORT
##
#
# load .json configuration files
#
def load(dir)
@services = load_all_json("#{dir}/services/*.json")
@tags = load_all_json("#{dir}/tags/*.json")
@common = load_all_json("#{dir}/common.json")['common']
@nodes = load_all_json("#{dir}/nodes/*.json", :node)
@nodes.each do |name, node|
apply_inheritance(node)
end
@nodes.each do |name, node|
node.each {|key,value| node[key] } # force evaluation of dynamic values
end
end
#
# save compiled hiera .yaml files
#
def export(dir)
Dir.glob(dir + '/*.yaml').each do |f|
File.unlink(f)
end
@nodes.each do |name, node|
File.open("#{dir}/#{name}.#{node.domain_internal}.yaml", 'w') do |f|
f.write node.to_yaml
end
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 = ConfigList.new
filters.each do |filter|
if filter =~ /^\+/
keep_list = nodes_for_filter(filter[1..-1])
node_list.delete_if do |name, node|
if keep_list[name]
false
else
true
end
end
else
node_list << nodes_for_filter(filter)
end
end
return node_list
end
##
## CLASS METHODS
##
def self.manager
@manager ||= begin
manager = ConfigManager.new
manager.load(Path.provider)
manager
end
end
def self.filter(filters); manager.filter(filters); end
def self.nodes; manager.nodes; end
def self.services; manager.services; end
def self.tags; manager.tags; end
private
def load_all_json(pattern, config_type = :class)
results = ConfigList.new
Dir.glob(pattern).each do |filename|
obj = load_json(filename, config_type)
if obj
name = File.basename(filename).sub(/\.json$/,'')
obj['name'] = name
results[name] = obj
end
end
results
end
def load_json(filename, config_type)
log2 { filename.sub(/^#{Regexp.escape(Path.root)}/,'') }
#
# 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, and flatten hash
begin
hash = Oj.load(buffer.string) || {}
rescue SyntaxError => exc
log0 'Error in file "%s":' % filename
log0 exc.to_s
return nil
end
return flatten_hash(hash, Config.new(config_type, self))
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
end
#
# makes this node inherit options from the common, service, and tag json files.
#
def apply_inheritance(node)
new_node = Config.new(:node, self)
new_node.merge!(@common)
if node['services']
node['services'].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.merge!(service)
service.nodes << node # this is odd, but we want the node pointer, not new_node pointer.
end
end
end
if node['tags']
node['tags'].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.merge!(tag)
tag.nodes << node
end
end
end
new_node.merge!(node)
node.replace(new_node)
end
def nodes_for_filter(filter)
if node = self.nodes[filter]
ConfigList.new(node)
elsif service = self.services[filter]
service.nodes
elsif tag = self.tags[filter]
tag.nodes
end
end
end
end
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