Module: Mixlib::Config
- Defined in:
- lib/mixlib/config.rb,
lib/mixlib/config/version.rb,
lib/mixlib/config/configurable.rb,
lib/mixlib/config/unknown_config_option_error.rb,
lib/mixlib/config/reopened_config_context_with_configurable_error.rb,
lib/mixlib/config/reopened_configurable_with_config_context_error.rb
Defined Under Namespace
Classes: Configurable, ReopenedConfigContextWithConfigurableError, ReopenedConfigurableWithConfigContextError, UnknownConfigOptionError
Constant Summary collapse
- NOT_PASSED =
Object.new
- VERSION =
"2.2.12"
Class Method Summary collapse
Instance Method Summary collapse
-
#[](config_option) ⇒ Object
Get the value of a config option.
-
#[]=(config_option, value) ⇒ Object
Set the value of a config option.
-
#config_attr_writer(method_symbol, &block) ⇒ Object
metaprogramming to ensure that the slot for method_symbol gets set to value after any other logic is run.
-
#config_context(symbol, &block) ⇒ Object
Allows you to create a new config context where you can define new options with default values.
-
#config_context_hash(plural_symbol, singular_symbol, &block) ⇒ Object
Allows you to create a new hash of config contexts where you can define new options with default values.
-
#config_context_list(plural_symbol, singular_symbol, &block) ⇒ Object
Allows you to create a new list of config contexts where you can define new options with default values.
-
#config_strict_mode(value = NOT_PASSED) ⇒ Object
Gets or sets strict mode.
-
#config_strict_mode=(value) ⇒ Object
Sets strict mode.
-
#configurable(symbol, &block) ⇒ Object
metaprogramming to set information about a config option.
-
#configure {|configuration| ... } ⇒ Object
Pass Mixlib::Config.configure() a block, and it will yield itself.
-
#default(symbol, default_value = nil, &block) ⇒ Object
metaprogramming to set the default value for the given config option.
-
#delete(symbol) ⇒ Object
Resets a config option to its default.
-
#from_file(filename) ⇒ Object
Loads a given ruby file, and runs instance_eval against it in the context of the current object.
-
#from_hash(hash, filename = "in_memory") ⇒ Object
Transforms a Hash into method-style configuration syntax to be processed.
-
#from_json(filename) ⇒ Object
Parses valid JSON structure into Ruby.
- #from_toml(filename) ⇒ Object
-
#from_yaml(filename) ⇒ Object
Parses valid YAML structure into Ruby so it can be ingested into the Class.
-
#hash_dup ⇒ Object
Creates a shallow copy of the internal hash NOTE: remove this in 3.0 in favor of save.
- #initialize_mixlib_config ⇒ Object
- #is_default?(key) ⇒ Boolean
-
#key?(key) ⇒ Boolean
(also: #has_key?)
Check if Mixlib::Config has a config option.
-
#keys ⇒ Object
Return the set of config hash keys.
-
#merge!(hash) ⇒ Object
Merge an incoming hash with our config options.
-
#method_missing(method_symbol, *args) ⇒ Object
Allows for simple lookups and setting of config options via method calls on Mixlib::Config.
-
#reset ⇒ Object
Resets all config options to their defaults.
-
#restore(hash) ⇒ Object
Restore non-default values from the given hash.
-
#save(include_defaults = false) ⇒ Object
(also: #to_hash)
Makes a copy of any non-default values.
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(method_symbol, *args) ⇒ Object
Allows for simple lookups and setting of config options via method calls on Mixlib::Config. If there any arguments to the method, they are used to set the value of the config option. Otherwise, it’s a simple get operation.
Parameters
- method_symbol<Symbol>
-
The method called. Must match a config option.
- *args
-
Any arguments passed to the method
Returns
- value
-
The value of the config option.
Raises
- <UnknownConfigOptionError>
-
If the config option does not exist and strict mode is on.
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# File 'lib/mixlib/config.rb', line 565 def method_missing(method_symbol, *args) method_symbol = $1.to_sym if method_symbol.to_s =~ /(.+)=$/ internal_get_or_set(method_symbol, *args) end |
Class Method Details
.extended(base) ⇒ Object
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# File 'lib/mixlib/config.rb', line 29 def self.extended(base) class << base; attr_accessor :configuration; end class << base; attr_accessor :configurables; end class << base; attr_accessor :config_contexts; end class << base; attr_accessor :config_context_lists; end class << base; attr_accessor :config_context_hashes; end class << base; attr_accessor :config_parent; end base.configuration = Hash.new base.configurables = Hash.new base.config_contexts = Hash.new base.config_context_lists = Hash.new base.config_context_hashes = Hash.new base.initialize_mixlib_config end |
Instance Method Details
#[](config_option) ⇒ Object
Get the value of a config option
Parameters
- config_option<Symbol>
-
The config option to return
Returns
- value
-
The value of the config option
Raises
- <UnknownConfigOptionError>
-
If the config option does not exist and strict mode is on.
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# File 'lib/mixlib/config.rb', line 128 def [](config_option) internal_get(config_option.to_sym) end |
#[]=(config_option, value) ⇒ Object
Set the value of a config option
Parameters
- config_option<Symbol>
-
The config option to set (within the [])
- value
-
The value for the config option
Returns
- value
-
The new value of the config option
Raises
- <UnknownConfigOptionError>
-
If the config option does not exist and strict mode is on.
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# File 'lib/mixlib/config.rb', line 143 def []=(config_option, value) internal_set(config_option.to_sym, value) end |
#config_attr_writer(method_symbol, &block) ⇒ Object
metaprogramming to ensure that the slot for method_symbol gets set to value after any other logic is run
Parameters
- method_symbol<Symbol>
-
Name of the method (variable setter)
- blk<Block>
-
logic block to run in setting slot method_symbol to value
- value<Object>
-
Value to be set in config hash
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# File 'lib/mixlib/config.rb', line 343 def config_attr_writer(method_symbol, &block) configurable(method_symbol).writes_value(&block) end |
#config_context(symbol, &block) ⇒ Object
Allows you to create a new config context where you can define new options with default values.
This method allows you to open up the configurable more than once.
For example:
config_context :server_info do
configurable(:url).defaults_to("http://localhost")
end
Parameters
symbol<Symbol>: the name of the context block<Block>: a block that will be run in the context of this new config class.
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# File 'lib/mixlib/config.rb', line 411 def config_context(symbol, &block) if configurables.has_key?(symbol) raise ReopenedConfigurableWithConfigContextError, "Cannot redefine config value #{symbol} with a config context" end if config_contexts.has_key?(symbol) context = config_contexts[symbol] else context = Class.new context.extend(::Mixlib::Config) context.config_parent = self config_contexts[symbol] = context define_attr_accessor_methods(symbol) end if block context.instance_eval(&block) end context end |
#config_context_hash(plural_symbol, singular_symbol, &block) ⇒ Object
Allows you to create a new hash of config contexts where you can define new options with default values.
This method allows you to open up the configurable more than once.
For example:
config_context_hash :listeners, :listener do
configurable(:url).defaults_to("http://localhost")
end
Parameters
symbol<Symbol>: the plural name for contexts in the list symbol<Symbol>: the singular name for contexts in the list block<Block>: a block that will be run in the context of this new config class.
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# File 'lib/mixlib/config.rb', line 481 def config_context_hash(plural_symbol, singular_symbol, &block) if configurables.has_key?(plural_symbol) raise ReopenedConfigurableWithConfigContextError, "Cannot redefine config value #{plural_symbol} with a config context" end unless config_context_hashes.has_key?(plural_symbol) config_context_hashes[plural_symbol] = { definition_blocks: [], values: {}, } define_hash_attr_accessor_methods(plural_symbol, singular_symbol) end config_context_hashes[plural_symbol][:definition_blocks] << block if block_given? end |
#config_context_list(plural_symbol, singular_symbol, &block) ⇒ Object
Allows you to create a new list of config contexts where you can define new options with default values.
This method allows you to open up the configurable more than once.
For example:
config_context_list :listeners, :listener do
configurable(:url).defaults_to("http://localhost")
end
Parameters
symbol<Symbol>: the plural name for contexts in the list symbol<Symbol>: the singular name for contexts in the list block<Block>: a block that will be run in the context of this new config class.
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# File 'lib/mixlib/config.rb', line 449 def config_context_list(plural_symbol, singular_symbol, &block) if configurables.has_key?(plural_symbol) raise ReopenedConfigurableWithConfigContextError, "Cannot redefine config value #{plural_symbol} with a config context" end unless config_context_lists.has_key?(plural_symbol) config_context_lists[plural_symbol] = { definition_blocks: [], values: [], } define_list_attr_accessor_methods(plural_symbol, singular_symbol) end config_context_lists[plural_symbol][:definition_blocks] << block if block_given? end |
#config_strict_mode(value = NOT_PASSED) ⇒ Object
Gets or sets strict mode. When strict mode is on, only values which were specified with configurable(), default() or writes_with() may be retrieved or set. Getting or setting anything else will cause Mixlib::Config::UnknownConfigOptionError to be thrown.
If this is set to :warn, unknown values may be get or set, but a warning will be printed with Chef::Log.warn if this occurs.
Parameters
- value<String>
-
pass this value to set strict mode [optional]
Returns
Current value of config_strict_mode
Raises
- <ArgumentError>
-
if value is set to something other than true, false, or :warn
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# File 'lib/mixlib/config.rb', line 516 def config_strict_mode(value = NOT_PASSED) if value == NOT_PASSED if @config_strict_mode.nil? if config_parent config_parent.config_strict_mode else false end else @config_strict_mode end else self.config_strict_mode = value end end |
#config_strict_mode=(value) ⇒ Object
Sets strict mode. When strict mode is on, only values which were specified with configurable(), default() or writes_with() may be retrieved or set. All other values
If this is set to :warn, unknown values may be get or set, but a warning will be printed with Chef::Log.warn if this occurs.
Parameters
- value<String>
-
pass this value to set strict mode [optional]
Raises
- <ArgumentError>
-
if value is set to something other than true, false, or :warn
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# File 'lib/mixlib/config.rb', line 545 def config_strict_mode=(value) if ![ true, false, :warn, nil ].include?(value) raise ArgumentError, "config_strict_mode must be true, false, nil or :warn" end @config_strict_mode = value end |
#configurable(symbol, &block) ⇒ Object
metaprogramming to set information about a config option. This may be used in one of two ways:
-
Block-based:
configurable(:attr) do
defaults_to 4
writes_value { |value| 10 }
end
-
Chain-based:
configurable(:attr).defaults_to(4).writes_value { |value| 10 }
Currently supported configuration:
defaults_to(value): value returned when configurable has no explicit value defaults_to BLOCK: block is run when the configurable has no explicit value writes_value BLOCK: block that is run to filter a value when it is being set
Parameters
- symbol<Symbol>
-
Name of the config option
- default_value<Object>
-
Default value [optional]
- block<Block>
-
Logic block that calculates default value [optional]
Returns
The value of the config option.
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# File 'lib/mixlib/config.rb', line 382 def configurable(symbol, &block) unless configurables[symbol] if config_contexts.has_key?(symbol) raise ReopenedConfigContextWithConfigurableError, "Cannot redefine config_context #{symbol} as a configurable value" end configurables[symbol] = Configurable.new(symbol) define_attr_accessor_methods(symbol) end if block yield(configurables[symbol]) end configurables[symbol] end |
#configure {|configuration| ... } ⇒ Object
Pass Mixlib::Config.configure() a block, and it will yield itself
Parameters
- block<Block>
-
A block that is called with self.configuration as the argument.
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# File 'lib/mixlib/config.rb', line 114 def configure(&block) yield(configuration) end |
#default(symbol, default_value = nil, &block) ⇒ Object
metaprogramming to set the default value for the given config option
Parameters
- symbol<Symbol>
-
Name of the config option
- default_value<Object>
-
Default value (can be unspecified)
- block<Block>
-
Logic block that calculates default value
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# File 'lib/mixlib/config.rb', line 353 def default(symbol, default_value = nil, &block) configurable(symbol).defaults_to(default_value, &block) end |
#delete(symbol) ⇒ Object
Resets a config option to its default.
Parameters
- symbol<Symbol>
-
Name of the config option
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# File 'lib/mixlib/config.rb', line 174 def delete(symbol) configuration.delete(symbol) end |
#from_file(filename) ⇒ Object
Loads a given ruby file, and runs instance_eval against it in the context of the current object.
Raises an IOError if the file cannot be found, or is not readable.
Parameters
- filename<String>
-
A filename to read from
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# File 'lib/mixlib/config.rb', line 55 def from_file(filename) if %w{ .yml .yaml }.include?(File.extname(filename)) from_yaml(filename) elsif File.extname(filename) == ".json" from_json(filename) elsif File.extname(filename) == ".toml" from_toml(filename) else instance_eval(IO.read(filename), filename, 1) end end |
#from_hash(hash, filename = "in_memory") ⇒ Object
Transforms a Hash into method-style configuration syntax to be processed
Parameters
- hash<Hash>
-
A Hash containing configuration
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# File 'lib/mixlib/config.rb', line 94 def from_hash(hash, filename = "in_memory") ruby_translation = [] to_dotted_hash(hash).each do |k, v| if v.is_a? Array ruby_translation << "#{k} #{v}" elsif v.is_a? String ruby_translation << "#{k} \"#{v}\"" else ruby_translation << "#{k} #{v}" end end instance_eval(ruby_translation.join("\n"), filename, 1) end |
#from_json(filename) ⇒ Object
Parses valid JSON structure into Ruby
Parameters
- filename<String>
-
A filename to read from
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# File 'lib/mixlib/config.rb', line 80 def from_json(filename) require "json" from_hash(JSON.parse(IO.read(filename)), filename) end |
#from_toml(filename) ⇒ Object
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# File 'lib/mixlib/config.rb', line 85 def from_toml(filename) require "tomlrb" from_hash(Tomlrb.parse(IO.read(filename), symbolize_keys: true)) end |
#from_yaml(filename) ⇒ Object
Parses valid YAML structure into Ruby so it can be ingested into the Class
Parameters
- filename<String>
-
A filename to read from
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# File 'lib/mixlib/config.rb', line 71 def from_yaml(filename) require "yaml" from_hash(YAML.load(IO.read(filename)), filename) end |
#hash_dup ⇒ Object
Creates a shallow copy of the internal hash NOTE: remove this in 3.0 in favor of save. This is completely useless with default values and configuration_context.
Returns
result of Hash#dup
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# File 'lib/mixlib/config.rb', line 331 def hash_dup save end |
#initialize_mixlib_config ⇒ Object
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# File 'lib/mixlib/config.rb', line 44 def initialize_mixlib_config @config_strict_mode = nil end |
#is_default?(key) ⇒ Boolean
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# File 'lib/mixlib/config.rb', line 161 def is_default?(key) symbol = key.to_sym if configurables.has_key?(symbol) configurables[symbol].is_default?(configuration) else raise ArgumentError, "config option must exist, and not be a context to check for default values" end end |
#key?(key) ⇒ Boolean Also known as: has_key?
Check if Mixlib::Config has a config option.
Parameters
- key<Symbol>
-
The config option to check for
Returns
- <True>
-
If the config option exists
- <False>
-
If the config option does not exist
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# File 'lib/mixlib/config.rb', line 155 def key?(key) configuration.has_key?(key.to_sym) || config_contexts.has_key?(key.to_sym) end |
#keys ⇒ Object
Return the set of config hash keys. This only returns hash keys which have been set by the user. In future versions this will likely be removed in favor of something more explicit. For now though, we want this to match has_key?
Returns
result of Hash#keys
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# File 'lib/mixlib/config.rb', line 321 def keys configuration.keys end |
#merge!(hash) ⇒ Object
Merge an incoming hash with our config options
Parameters
hash<Hash>: a hash in the same format as output by save.
Returns
self
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# File 'lib/mixlib/config.rb', line 302 def merge!(hash) hash.each do |key, value| if config_contexts.has_key?(key) # Grab the config context and let internal_get cache it if so desired config_contexts[key].restore(value) else configuration[key] = value end end self end |
#reset ⇒ Object
Resets all config options to their defaults.
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# File 'lib/mixlib/config.rb', line 179 def reset self.configuration = Hash.new config_contexts.values.each { |config_context| config_context.reset } end |
#restore(hash) ⇒ Object
Restore non-default values from the given hash.
Parameters
hash<Hash>: a hash in the same format as output by save.
Returns
self
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# File 'lib/mixlib/config.rb', line 264 def restore(hash) self.configuration = hash.reject { |key, value| config_contexts.has_key?(key) } config_contexts.each do |key, config_context| if hash.has_key?(key) config_context.restore(hash[key]) else config_context.reset end end config_context_lists.each do |key, | [:values] = [] if hash.has_key?(key) hash[key].each do |val| context = define_context([:definition_blocks]) context.restore(val) [:values] << context end end end config_context_hashes.each do |key, | [:values] = {} if hash.has_key?(key) hash[key].each do |vkey, val| context = define_context([:definition_blocks]) context.restore(val) [:values][vkey] = context end end end end |
#save(include_defaults = false) ⇒ Object Also known as: to_hash
Makes a copy of any non-default values.
This returns a shallow copy of the hash; while the hash itself is duplicated a la dup, modifying data inside arrays and hashes may modify the original Config object.
Returns
Hash of values the user has set.
Examples
For example, this config class:
class MyConfig < Mixlib::Config
default :will_be_set, 1
default :will_be_set_to_default, 1
default :will_not_be_set, 1
configurable(:computed_value) { |x| x*2 }
config_context :group do
default :will_not_be_set, 1
end
config_context :group_never_set
end
MyConfig.x = 2
MyConfig.will_be_set = 2
MyConfig.will_be_set_to_default = 1
MyConfig.computed_value = 2
MyConfig.group.x = 3
produces this:
MyConfig.save == {
:x => 2,
:will_be_set => 2,
:will_be_set_to_default => 1,
:computed_value => 4,
:group => {
:x => 3
}
}
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# File 'lib/mixlib/config.rb', line 227 def save(include_defaults = false) result = configuration.dup if include_defaults (configurables.keys - result.keys).each do |missing_default| # Ask any configurables to save themselves into the result array if configurables[missing_default].has_default result[missing_default] = configurables[missing_default].default end end end config_contexts.each_pair do |key, context| context_result = context.save(include_defaults) result[key] = context_result if context_result.size != 0 || include_defaults end config_context_lists.each_pair do |key, | [:values].each do |context| context_result = context.save(include_defaults) result[key] = (result[key] || []) << context_result if context_result.size != 0 || include_defaults end end config_context_hashes.each_pair do |key, | [:values].each_pair do |context_key, context| context_result = context.save(include_defaults) (result[key] ||= {})[context_key] = context_result if context_result.size != 0 || include_defaults end end result end |