615 lines
21 KiB
Ruby
615 lines
21 KiB
Ruby
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module ActiveSupport #:nodoc:
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module Dependencies #:nodoc:
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extend self
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# Should we turn on Ruby warnings on the first load of dependent files?
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mattr_accessor :warnings_on_first_load
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self.warnings_on_first_load = false
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# All files ever loaded.
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mattr_accessor :history
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self.history = Set.new
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# All files currently loaded.
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mattr_accessor :loaded
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self.loaded = Set.new
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# Should we load files or require them?
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mattr_accessor :mechanism
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self.mechanism = :load
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# The set of directories from which we may automatically load files. Files
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# under these directories will be reloaded on each request in development mode,
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# unless the directory also appears in load_once_paths.
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mattr_accessor :load_paths
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self.load_paths = []
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# The set of directories from which automatically loaded constants are loaded
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# only once. All directories in this set must also be present in +load_paths+.
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mattr_accessor :load_once_paths
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self.load_once_paths = []
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# An array of qualified constant names that have been loaded. Adding a name to
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# this array will cause it to be unloaded the next time Dependencies are cleared.
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mattr_accessor :autoloaded_constants
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self.autoloaded_constants = []
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# An array of constant names that need to be unloaded on every request. Used
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# to allow arbitrary constants to be marked for unloading.
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mattr_accessor :explicitly_unloadable_constants
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self.explicitly_unloadable_constants = []
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# The logger is used for generating information on the action run-time (including benchmarking) if available.
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# Can be set to nil for no logging. Compatible with both Ruby's own Logger and Log4r loggers.
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mattr_accessor :logger
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# Set to true to enable logging of const_missing and file loads
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mattr_accessor :log_activity
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self.log_activity = false
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# An internal stack used to record which constants are loaded by any block.
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mattr_accessor :constant_watch_stack
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self.constant_watch_stack = []
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mattr_accessor :constant_watch_stack_mutex
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self.constant_watch_stack_mutex = Mutex.new
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# Module includes this module
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module ModuleConstMissing #:nodoc:
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def self.included(base) #:nodoc:
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base.class_eval do
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unless defined? const_missing_without_dependencies
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alias_method_chain :const_missing, :dependencies
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end
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end
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end
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def self.excluded(base) #:nodoc:
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base.class_eval do
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if defined? const_missing_without_dependencies
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undef_method :const_missing
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alias_method :const_missing, :const_missing_without_dependencies
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undef_method :const_missing_without_dependencies
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end
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end
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end
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# Use const_missing to autoload associations so we don't have to
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# require_association when using single-table inheritance.
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def const_missing_with_dependencies(class_id)
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ActiveSupport::Dependencies.load_missing_constant self, class_id
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end
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def unloadable(const_desc = self)
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super(const_desc)
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end
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end
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# Class includes this module
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module ClassConstMissing #:nodoc:
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def const_missing(const_name)
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if [Object, Kernel].include?(self) || parent == self
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super
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else
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begin
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begin
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Dependencies.load_missing_constant self, const_name
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rescue NameError
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parent.send :const_missing, const_name
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end
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rescue NameError => e
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# Make sure that the name we are missing is the one that caused the error
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parent_qualified_name = Dependencies.qualified_name_for parent, const_name
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raise unless e.missing_name? parent_qualified_name
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qualified_name = Dependencies.qualified_name_for self, const_name
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raise NameError.new("uninitialized constant #{qualified_name}").copy_blame!(e)
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end
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end
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end
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end
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# Object includes this module
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module Loadable #:nodoc:
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def self.included(base) #:nodoc:
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base.class_eval do
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unless defined? load_without_new_constant_marking
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alias_method_chain :load, :new_constant_marking
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end
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end
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end
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def self.excluded(base) #:nodoc:
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base.class_eval do
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if defined? load_without_new_constant_marking
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undef_method :load
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alias_method :load, :load_without_new_constant_marking
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undef_method :load_without_new_constant_marking
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end
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end
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end
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def require_or_load(file_name)
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Dependencies.require_or_load(file_name)
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end
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def require_dependency(file_name)
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Dependencies.depend_on(file_name)
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end
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def require_association(file_name)
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Dependencies.associate_with(file_name)
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end
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def load_with_new_constant_marking(file, *extras) #:nodoc:
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if Dependencies.load?
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Dependencies.new_constants_in(Object) { load_without_new_constant_marking(file, *extras) }
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else
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load_without_new_constant_marking(file, *extras)
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end
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rescue Exception => exception # errors from loading file
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exception.blame_file! file
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raise
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end
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# Mark the given constant as unloadable. Unloadable constants are removed each
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# time dependencies are cleared.
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#
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# Note that marking a constant for unloading need only be done once. Setup
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# or init scripts may list each unloadable constant that may need unloading;
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# each constant will be removed for every subsequent clear, as opposed to for
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# the first clear.
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#
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# The provided constant descriptor may be a (non-anonymous) module or class,
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# or a qualified constant name as a string or symbol.
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#
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# Returns true if the constant was not previously marked for unloading, false
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# otherwise.
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def unloadable(const_desc)
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Dependencies.mark_for_unload const_desc
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end
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end
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# Exception file-blaming
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module Blamable #:nodoc:
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def blame_file!(file)
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(@blamed_files ||= []).unshift file
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end
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def blamed_files
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@blamed_files ||= []
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end
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def describe_blame
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return nil if blamed_files.empty?
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"This error occurred while loading the following files:\n #{blamed_files.join "\n "}"
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end
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def copy_blame!(exc)
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@blamed_files = exc.blamed_files.clone
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self
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end
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end
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def hook!
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Object.instance_eval { include Loadable }
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Module.instance_eval { include ModuleConstMissing }
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Class.instance_eval { include ClassConstMissing }
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Exception.instance_eval { include Blamable }
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true
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end
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def unhook!
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ModuleConstMissing.excluded(Module)
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Loadable.excluded(Object)
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true
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end
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def load?
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mechanism == :load
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end
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def depend_on(file_name, swallow_load_errors = false)
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path = search_for_file(file_name)
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require_or_load(path || file_name)
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rescue LoadError
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raise unless swallow_load_errors
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end
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def associate_with(file_name)
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depend_on(file_name, true)
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end
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def clear
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log_call
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loaded.clear
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remove_unloadable_constants!
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end
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def require_or_load(file_name, const_path = nil)
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log_call file_name, const_path
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file_name = $1 if file_name =~ /^(.*)\.rb$/
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expanded = File.expand_path(file_name)
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return if loaded.include?(expanded)
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# Record that we've seen this file *before* loading it to avoid an
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# infinite loop with mutual dependencies.
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loaded << expanded
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begin
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if load?
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log "loading #{file_name}"
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# Enable warnings iff this file has not been loaded before and
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# warnings_on_first_load is set.
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load_args = ["#{file_name}.rb"]
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load_args << const_path unless const_path.nil?
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if !warnings_on_first_load or history.include?(expanded)
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result = load_file(*load_args)
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else
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enable_warnings { result = load_file(*load_args) }
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end
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else
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log "requiring #{file_name}"
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result = require file_name
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end
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rescue Exception
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loaded.delete expanded
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raise
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end
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# Record history *after* loading so first load gets warnings.
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history << expanded
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return result
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end
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# Is the provided constant path defined?
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def qualified_const_defined?(path)
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raise NameError, "#{path.inspect} is not a valid constant name!" unless
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/^(::)?([A-Z]\w*)(::[A-Z]\w*)*$/ =~ path
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names = path.to_s.split('::')
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names.shift if names.first.empty?
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# We can't use defined? because it will invoke const_missing for the parent
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# of the name we are checking.
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names.inject(Object) do |mod, name|
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return false unless uninherited_const_defined?(mod, name)
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mod.const_get name
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end
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return true
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end
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if Module.method(:const_defined?).arity == 1
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# Does this module define this constant?
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# Wrapper to accomodate changing Module#const_defined? in Ruby 1.9
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def uninherited_const_defined?(mod, const)
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mod.const_defined?(const)
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end
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else
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def uninherited_const_defined?(mod, const) #:nodoc:
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mod.const_defined?(const, false)
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end
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end
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# Given +path+, a filesystem path to a ruby file, return an array of constant
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# paths which would cause Dependencies to attempt to load this file.
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def loadable_constants_for_path(path, bases = load_paths)
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path = $1 if path =~ /\A(.*)\.rb\Z/
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expanded_path = File.expand_path(path)
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bases.collect do |root|
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expanded_root = File.expand_path(root)
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next unless %r{\A#{Regexp.escape(expanded_root)}(/|\\)} =~ expanded_path
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nesting = expanded_path[(expanded_root.size)..-1]
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nesting = nesting[1..-1] if nesting && nesting[0] == ?/
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next if nesting.blank?
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nesting_camel = nesting.camelize
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begin
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qualified_const_defined?(nesting_camel)
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rescue NameError
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next
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end
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[ nesting_camel ]
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end.flatten.compact.uniq
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end
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# Search for a file in load_paths matching the provided suffix.
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def search_for_file(path_suffix)
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path_suffix = path_suffix + '.rb' unless path_suffix.ends_with? '.rb'
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load_paths.each do |root|
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path = File.join(root, path_suffix)
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return path if File.file? path
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end
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nil # Gee, I sure wish we had first_match ;-)
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end
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# Does the provided path_suffix correspond to an autoloadable module?
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# Instead of returning a boolean, the autoload base for this module is returned.
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def autoloadable_module?(path_suffix)
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load_paths.each do |load_path|
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return load_path if File.directory? File.join(load_path, path_suffix)
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end
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nil
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end
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def load_once_path?(path)
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load_once_paths.any? { |base| path.starts_with? base }
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end
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# Attempt to autoload the provided module name by searching for a directory
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# matching the expect path suffix. If found, the module is created and assigned
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# to +into+'s constants with the name +const_name+. Provided that the directory
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# was loaded from a reloadable base path, it is added to the set of constants
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# that are to be unloaded.
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def autoload_module!(into, const_name, qualified_name, path_suffix)
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return nil unless base_path = autoloadable_module?(path_suffix)
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mod = Module.new
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into.const_set const_name, mod
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autoloaded_constants << qualified_name unless load_once_paths.include?(base_path)
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return mod
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end
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# Load the file at the provided path. +const_paths+ is a set of qualified
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# constant names. When loading the file, Dependencies will watch for the
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# addition of these constants. Each that is defined will be marked as
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# autoloaded, and will be removed when Dependencies.clear is next called.
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#
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# If the second parameter is left off, then Dependencies will construct a set
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# of names that the file at +path+ may define. See
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# +loadable_constants_for_path+ for more details.
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def load_file(path, const_paths = loadable_constants_for_path(path))
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log_call path, const_paths
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const_paths = [const_paths].compact unless const_paths.is_a? Array
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parent_paths = const_paths.collect { |const_path| /(.*)::[^:]+\Z/ =~ const_path ? $1 : :Object }
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result = nil
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newly_defined_paths = new_constants_in(*parent_paths) do
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result = load_without_new_constant_marking path
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end
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autoloaded_constants.concat newly_defined_paths unless load_once_path?(path)
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autoloaded_constants.uniq!
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log "loading #{path} defined #{newly_defined_paths * ', '}" unless newly_defined_paths.empty?
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return result
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end
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# Return the constant path for the provided parent and constant name.
|
||
|
|
def qualified_name_for(mod, name)
|
||
|
|
mod_name = to_constant_name mod
|
||
|
|
(%w(Object Kernel).include? mod_name) ? name.to_s : "#{mod_name}::#{name}"
|
||
|
|
end
|
||
|
|
|
||
|
|
# Load the constant named +const_name+ which is missing from +from_mod+. If
|
||
|
|
# it is not possible to load the constant into from_mod, try its parent module
|
||
|
|
# using const_missing.
|
||
|
|
def load_missing_constant(from_mod, const_name)
|
||
|
|
log_call from_mod, const_name
|
||
|
|
if from_mod == Kernel
|
||
|
|
if ::Object.const_defined?(const_name)
|
||
|
|
log "Returning Object::#{const_name} for Kernel::#{const_name}"
|
||
|
|
return ::Object.const_get(const_name)
|
||
|
|
else
|
||
|
|
log "Substituting Object for Kernel"
|
||
|
|
from_mod = Object
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
# If we have an anonymous module, all we can do is attempt to load from Object.
|
||
|
|
from_mod = Object if from_mod.name.blank?
|
||
|
|
|
||
|
|
unless qualified_const_defined?(from_mod.name) && from_mod.name.constantize.object_id == from_mod.object_id
|
||
|
|
raise ArgumentError, "A copy of #{from_mod} has been removed from the module tree but is still active!"
|
||
|
|
end
|
||
|
|
|
||
|
|
raise ArgumentError, "#{from_mod} is not missing constant #{const_name}!" if uninherited_const_defined?(from_mod, const_name)
|
||
|
|
|
||
|
|
qualified_name = qualified_name_for from_mod, const_name
|
||
|
|
path_suffix = qualified_name.underscore
|
||
|
|
name_error = NameError.new("uninitialized constant #{qualified_name}")
|
||
|
|
|
||
|
|
file_path = search_for_file(path_suffix)
|
||
|
|
if file_path && ! loaded.include?(File.expand_path(file_path)) # We found a matching file to load
|
||
|
|
require_or_load file_path
|
||
|
|
raise LoadError, "Expected #{file_path} to define #{qualified_name}" unless uninherited_const_defined?(from_mod, const_name)
|
||
|
|
return from_mod.const_get(const_name)
|
||
|
|
elsif mod = autoload_module!(from_mod, const_name, qualified_name, path_suffix)
|
||
|
|
return mod
|
||
|
|
elsif (parent = from_mod.parent) && parent != from_mod &&
|
||
|
|
! from_mod.parents.any? { |p| uninherited_const_defined?(p, const_name) }
|
||
|
|
# If our parents do not have a constant named +const_name+ then we are free
|
||
|
|
# to attempt to load upwards. If they do have such a constant, then this
|
||
|
|
# const_missing must be due to from_mod::const_name, which should not
|
||
|
|
# return constants from from_mod's parents.
|
||
|
|
begin
|
||
|
|
return parent.const_missing(const_name)
|
||
|
|
rescue NameError => e
|
||
|
|
raise unless e.missing_name? qualified_name_for(parent, const_name)
|
||
|
|
raise name_error
|
||
|
|
end
|
||
|
|
else
|
||
|
|
raise name_error
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
# Remove the constants that have been autoloaded, and those that have been
|
||
|
|
# marked for unloading.
|
||
|
|
def remove_unloadable_constants!
|
||
|
|
autoloaded_constants.each { |const| remove_constant const }
|
||
|
|
autoloaded_constants.clear
|
||
|
|
explicitly_unloadable_constants.each { |const| remove_constant const }
|
||
|
|
end
|
||
|
|
|
||
|
|
# Determine if the given constant has been automatically loaded.
|
||
|
|
def autoloaded?(desc)
|
||
|
|
# No name => anonymous module.
|
||
|
|
return false if desc.is_a?(Module) && desc.name.blank?
|
||
|
|
name = to_constant_name desc
|
||
|
|
return false unless qualified_const_defined? name
|
||
|
|
return autoloaded_constants.include?(name)
|
||
|
|
end
|
||
|
|
|
||
|
|
# Will the provided constant descriptor be unloaded?
|
||
|
|
def will_unload?(const_desc)
|
||
|
|
autoloaded?(const_desc) ||
|
||
|
|
explicitly_unloadable_constants.include?(to_constant_name(const_desc))
|
||
|
|
end
|
||
|
|
|
||
|
|
# Mark the provided constant name for unloading. This constant will be
|
||
|
|
# unloaded on each request, not just the next one.
|
||
|
|
def mark_for_unload(const_desc)
|
||
|
|
name = to_constant_name const_desc
|
||
|
|
if explicitly_unloadable_constants.include? name
|
||
|
|
return false
|
||
|
|
else
|
||
|
|
explicitly_unloadable_constants << name
|
||
|
|
return true
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
# Run the provided block and detect the new constants that were loaded during
|
||
|
|
# its execution. Constants may only be regarded as 'new' once -- so if the
|
||
|
|
# block calls +new_constants_in+ again, then the constants defined within the
|
||
|
|
# inner call will not be reported in this one.
|
||
|
|
#
|
||
|
|
# If the provided block does not run to completion, and instead raises an
|
||
|
|
# exception, any new constants are regarded as being only partially defined
|
||
|
|
# and will be removed immediately.
|
||
|
|
def new_constants_in(*descs)
|
||
|
|
log_call(*descs)
|
||
|
|
|
||
|
|
# Build the watch frames. Each frame is a tuple of
|
||
|
|
# [module_name_as_string, constants_defined_elsewhere]
|
||
|
|
watch_frames = descs.collect do |desc|
|
||
|
|
if desc.is_a? Module
|
||
|
|
mod_name = desc.name
|
||
|
|
initial_constants = desc.local_constant_names
|
||
|
|
elsif desc.is_a?(String) || desc.is_a?(Symbol)
|
||
|
|
mod_name = desc.to_s
|
||
|
|
|
||
|
|
# Handle the case where the module has yet to be defined.
|
||
|
|
initial_constants = if qualified_const_defined?(mod_name)
|
||
|
|
mod_name.constantize.local_constant_names
|
||
|
|
else
|
||
|
|
[]
|
||
|
|
end
|
||
|
|
else
|
||
|
|
raise Argument, "#{desc.inspect} does not describe a module!"
|
||
|
|
end
|
||
|
|
|
||
|
|
[mod_name, initial_constants]
|
||
|
|
end
|
||
|
|
|
||
|
|
constant_watch_stack_mutex.synchronize do
|
||
|
|
constant_watch_stack.concat watch_frames
|
||
|
|
end
|
||
|
|
|
||
|
|
aborting = true
|
||
|
|
begin
|
||
|
|
yield # Now yield to the code that is to define new constants.
|
||
|
|
aborting = false
|
||
|
|
ensure
|
||
|
|
# Find the new constants.
|
||
|
|
new_constants = watch_frames.collect do |mod_name, prior_constants|
|
||
|
|
# Module still doesn't exist? Treat it as if it has no constants.
|
||
|
|
next [] unless qualified_const_defined?(mod_name)
|
||
|
|
|
||
|
|
mod = mod_name.constantize
|
||
|
|
next [] unless mod.is_a? Module
|
||
|
|
new_constants = mod.local_constant_names - prior_constants
|
||
|
|
|
||
|
|
# Make sure no other frames takes credit for these constants.
|
||
|
|
constant_watch_stack_mutex.synchronize do
|
||
|
|
constant_watch_stack.each do |frame_name, constants|
|
||
|
|
constants.concat new_constants if frame_name == mod_name
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
new_constants.collect do |suffix|
|
||
|
|
mod_name == "Object" ? suffix : "#{mod_name}::#{suffix}"
|
||
|
|
end
|
||
|
|
end.flatten
|
||
|
|
|
||
|
|
log "New constants: #{new_constants * ', '}"
|
||
|
|
|
||
|
|
if aborting
|
||
|
|
log "Error during loading, removing partially loaded constants "
|
||
|
|
new_constants.each { |name| remove_constant name }
|
||
|
|
new_constants.clear
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
return new_constants
|
||
|
|
ensure
|
||
|
|
# Remove the stack frames that we added.
|
||
|
|
if defined?(watch_frames) && ! watch_frames.blank?
|
||
|
|
frame_ids = watch_frames.collect { |frame| frame.object_id }
|
||
|
|
constant_watch_stack_mutex.synchronize do
|
||
|
|
constant_watch_stack.delete_if do |watch_frame|
|
||
|
|
frame_ids.include? watch_frame.object_id
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
class LoadingModule #:nodoc:
|
||
|
|
# Old style environment.rb referenced this method directly. Please note, it doesn't
|
||
|
|
# actually *do* anything any more.
|
||
|
|
def self.root(*args)
|
||
|
|
if defined?(Rails) && Rails.logger
|
||
|
|
Rails.logger.warn "Your environment.rb uses the old syntax, it may not continue to work in future releases."
|
||
|
|
Rails.logger.warn "For upgrade instructions please see: http://manuals.rubyonrails.com/read/book/19"
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
# Convert the provided const desc to a qualified constant name (as a string).
|
||
|
|
# A module, class, symbol, or string may be provided.
|
||
|
|
def to_constant_name(desc) #:nodoc:
|
||
|
|
name = case desc
|
||
|
|
when String then desc.starts_with?('::') ? desc[2..-1] : desc
|
||
|
|
when Symbol then desc.to_s
|
||
|
|
when Module
|
||
|
|
raise ArgumentError, "Anonymous modules have no name to be referenced by" if desc.name.blank?
|
||
|
|
desc.name
|
||
|
|
else raise TypeError, "Not a valid constant descriptor: #{desc.inspect}"
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
def remove_constant(const) #:nodoc:
|
||
|
|
return false unless qualified_const_defined? const
|
||
|
|
|
||
|
|
const = $1 if /\A::(.*)\Z/ =~ const.to_s
|
||
|
|
names = const.to_s.split('::')
|
||
|
|
if names.size == 1 # It's under Object
|
||
|
|
parent = Object
|
||
|
|
else
|
||
|
|
parent = (names[0..-2] * '::').constantize
|
||
|
|
end
|
||
|
|
|
||
|
|
log "removing constant #{const}"
|
||
|
|
parent.instance_eval { remove_const names.last }
|
||
|
|
return true
|
||
|
|
end
|
||
|
|
|
||
|
|
protected
|
||
|
|
def log_call(*args)
|
||
|
|
if logger && log_activity
|
||
|
|
arg_str = args.collect { |arg| arg.inspect } * ', '
|
||
|
|
/in `([a-z_\?\!]+)'/ =~ caller(1).first
|
||
|
|
selector = $1 || '<unknown>'
|
||
|
|
log "called #{selector}(#{arg_str})"
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
def log(msg)
|
||
|
|
if logger && log_activity
|
||
|
|
logger.debug "Dependencies: #{msg}"
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
ActiveSupport::Dependencies.hook!
|