lib/fluent/configurable.rb
#
# Fluentd
#
# 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 'fluent/config/configure_proxy'
require 'fluent/config/section'
require 'fluent/config/error'
require 'fluent/registry'
require 'fluent/plugin'
require 'fluent/config/types'
module Fluent
module Configurable
def self.included(mod)
mod.extend(ClassMethods)
end
def initialize
super
# to simulate implicit 'attr_accessor' by config_param / config_section and its value by config_set_default
proxy = self.class.merged_configure_proxy
proxy.params.each_key do |name|
next if name.to_s.start_with?('@')
if proxy.defaults.has_key?(name)
instance_variable_set("@#{name}".to_sym, proxy.defaults[name])
end
end
proxy.sections.each_key do |name|
next if name.to_s.start_with?('@')
subproxy = proxy.sections[name]
if subproxy.multi?
instance_variable_set("@#{subproxy.variable_name}".to_sym, [])
else
instance_variable_set("@#{subproxy.variable_name}".to_sym, nil)
end
end
end
def configure_proxy_generate
proxy = self.class.merged_configure_proxy
if self.respond_to?(:owner) && self.owner
owner_proxy = owner.class.merged_configure_proxy
if proxy.configured_in_section
owner_proxy = owner_proxy.sections[proxy.configured_in_section]
end
proxy.overwrite_defaults(owner_proxy) if owner_proxy
end
proxy
end
def configured_section_create(name, conf = nil)
conf ||= Fluent::Config::Element.new(name.to_s, '', {}, [])
root_proxy = configure_proxy_generate
proxy = if name.nil? # root
root_proxy
else
root_proxy.sections[name]
end
# take care to raise Fluent::ConfigError if conf mismatched to proxy
Fluent::Config::SectionGenerator.generate(proxy, conf, nil, nil)
end
def configure(conf, strict_config_value=false)
@config = conf
logger = if self.respond_to?(:log)
self.log
elsif self.respond_to?(:owner) && self.owner.respond_to?(:log)
self.owner.log
elsif defined?($log)
$log
else
nil
end
proxy = configure_proxy_generate
conf.corresponding_proxies << proxy
# In the nested section, can't get plugin class through proxies so get plugin class here
plugin_class = Fluent::Plugin.lookup_type_from_class(proxy.name.to_s)
root = Fluent::Config::SectionGenerator.generate(proxy, conf, logger, plugin_class, [], strict_config_value)
@config_root_section = root
root.instance_eval{ @params.keys }.each do |param_name|
next if param_name.to_s.start_with?('@')
varname = "@#{param_name}".to_sym
instance_variable_set(varname, root[param_name])
end
self
end
def config
@masked_config ||= @config.to_masked_element
end
CONFIG_TYPE_REGISTRY = Registry.new(:config_type, 'fluent/plugin/type_')
def self.register_type(type, callable = nil, &block)
callable ||= block
CONFIG_TYPE_REGISTRY.register(type, callable)
end
def self.lookup_type(type)
CONFIG_TYPE_REGISTRY.lookup(type)
end
{
string: Config::STRING_TYPE,
enum: Config::ENUM_TYPE,
integer: Config::INTEGER_TYPE,
float: Config::FLOAT_TYPE,
size: Config::SIZE_TYPE,
bool: Config::BOOL_TYPE,
time: Config::TIME_TYPE,
hash: Config::HASH_TYPE,
array: Config::ARRAY_TYPE,
regexp: Config::REGEXP_TYPE,
}.each do |name, type|
register_type(name, type)
end
module ClassMethods
def configure_proxy_map
map = {}
self.define_singleton_method(:configure_proxy_map){ map }
map
end
def configure_proxy(mod_name)
map = configure_proxy_map
unless map[mod_name]
type_lookup = ->(type) { Fluent::Configurable.lookup_type(type) }
proxy = Fluent::Config::ConfigureProxy.new(mod_name, root: true, required: true, multi: false, type_lookup: type_lookup)
map[mod_name] = proxy
end
map[mod_name]
end
def configured_in(section_name)
configure_proxy(self.name).configured_in(section_name)
end
def config_param(name, type = nil, **kwargs, &block)
configure_proxy(self.name).config_param(name, type, **kwargs, &block)
# reserved names '@foo' are invalid as attr_accessor name
attr_accessor(name) unless kwargs[:skip_accessor] || Fluent::Config::Element::RESERVED_PARAMETERS.include?(name.to_s)
end
def config_set_default(name, defval)
configure_proxy(self.name).config_set_default(name, defval)
end
def config_set_desc(name, desc)
configure_proxy(self.name).config_set_desc(name, desc)
end
def config_section(name, **kwargs, &block)
section_already_exists = !!merged_configure_proxy.sections[name]
configure_proxy(self.name).config_section(name, **kwargs, &block)
variable_name = configure_proxy(self.name).sections[name].variable_name
if !section_already_exists && !self.respond_to?(variable_name)
attr_accessor variable_name
end
end
def desc(description)
configure_proxy(self.name).desc(description)
end
def merged_configure_proxy
configurables = ancestors.reverse.select{ |a| a.respond_to?(:configure_proxy) }
# 'a.object_id.to_s' is to support anonymous class
# which created in tests to overwrite original behavior temporally
#
# p Module.new.name #=> nil
# p Class.new.name #=> nil
# p AnyGreatClass.dup.name #=> nil
configurables.map{ |a| a.configure_proxy(a.name || a.object_id.to_s) }.reduce(:merge)
end
def dump_config_definition
configure_proxy_map[self.to_s].dump_config_definition
end
end
end
end