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require 'concurrent/hash'
module Dry
module Configurable
# @private
class Config
class << self
# @private
def [](settings)
::Class.new(Config) do
@settings = settings
singleton_class.send(:attr_reader, :settings)
@lock = ::Mutex.new
@config_defined = false
end
end
# @private
def define_accessors!
@lock.synchronize do
break if config_defined?
settings.each do |setting|
next if setting.reserved?
define_method(setting.name) do
@config[setting.name]
end
define_method("#{setting.name}=") do |value|
raise FrozenConfig, 'Cannot modify frozen config' if frozen?
@config[setting.name] = setting.processor.(value)
end
end
@config_defined = true
end
end
# @private
def config_defined?
@config_defined
end
end
def initialize
@config = ::Concurrent::Hash.new
@lock = ::Mutex.new
@defined = false
end
def defined?
@defined
end
# @private
def define!(parent_config = EMPTY_HASH)
@lock.synchronize do
break if self.defined?
self.class.define_accessors!
set_values!(parent_config)
@defined = true
end
self
end
# @private
def finalize!
define!
@config.freeze
freeze
end
# Serialize config to a Hash
#
# @return [Hash]
#
# @api public
def to_h
@config.each_with_object({}) do |(key, value), hash|
case value
when Config
hash[key] = value.to_h
else
hash[key] = value
end
end
end
alias to_hash to_h
# Get config value by a key
#
# @param [String,Symbol] name
#
# @return Config value
def [](name)
setting = self.class.settings[name.to_sym]
if setting.nil?
raise_unknown_setting_error(name)
elsif setting.reserved?
@config[setting.name]
else
public_send(name)
end
end
# Set config value.
# Note that finalized configs cannot be changed.
#
# @param [String,Symbol] name
# @param [Object] value
def []=(name, value)
setting = self.class.settings[name.to_sym]
if setting.nil?
raise_unknown_setting_error(name)
elsif setting.reserved?
@config[setting.name] = setting.processor.(value)
else
public_send("#{name}=", value)
end
end
# Whether config has a key
#
# @param [Symbol] key
# @return [Bool]
def key?(name)
self.class.settings.name?(name)
end
# Recursively update values from a hash
#
# @param [Hash] values to set
# @return [Config]
def update(values)
values.each do |key, value|
if self[key].is_a?(Config)
self[key].update(value)
else
self[key] = value
end
end
self
end
def dup
if self.defined?
self.class.new.define!(to_h)
else
self.class.new
end
end
private
# @private
def set_values!(parent)
self.class.settings.each do |setting|
if parent.key?(setting.name) && !setting.node?
@config[setting.name] = parent[setting.name]
elsif setting.undefined?
@config[setting.name] = nil
elsif setting.node?
value = setting.value.create_config
value.define!(parent.fetch(setting.name, EMPTY_HASH))
self[setting.name] = value
else
self[setting.name] = setting.value
end
end
end
# @private
def raise_unknown_setting_error(name)
::Kernel.raise ArgumentError, "+#{name}+ is not a setting name"
end
end
end
end
|
