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679 lines
23 KiB
Ruby
679 lines
23 KiB
Ruby
require 'set'
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require 'thread'
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require 'pathname'
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require 'active_support/core_ext/module/aliasing'
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require 'active_support/core_ext/module/attribute_accessors'
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require 'active_support/core_ext/module/introspection'
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require 'active_support/core_ext/module/anonymous'
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require 'active_support/core_ext/module/qualified_const'
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require 'active_support/core_ext/object/blank'
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require 'active_support/core_ext/load_error'
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require 'active_support/core_ext/name_error'
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require 'active_support/core_ext/string/starts_ends_with'
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require 'active_support/inflector'
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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 = ENV['NO_RELOAD'] ? :require : :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 autoload_once_paths.
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mattr_accessor :autoload_paths
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self.autoload_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 +autoload_paths+.
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mattr_accessor :autoload_once_paths
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self.autoload_once_paths = []
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# An array of qualified constant names that have been loaded. Adding a name
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# to this array will cause it to be unloaded the next time Dependencies are
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# 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
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# (including benchmarking) if available. Can be set to nil for no logging.
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# 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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# The WatchStack keeps a stack of the modules being watched as files are
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# loaded. If a file in the process of being loaded (parent.rb) triggers the
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# load of another file (child.rb) the stack will ensure that child.rb
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# handles the new constants.
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#
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# If child.rb is being autoloaded, its constants will be added to
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# autoloaded_constants. If it was being `require`d, they will be discarded.
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#
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# This is handled by walking back up the watch stack and adding the constants
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# found by child.rb to the list of original constants in parent.rb.
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class WatchStack
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include Enumerable
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# @watching is a stack of lists of constants being watched. For instance,
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# if parent.rb is autoloaded, the stack will look like [[Object]]. If
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# parent.rb then requires namespace/child.rb, the stack will look like
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# [[Object], [Namespace]].
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def initialize
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@watching = []
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@stack = Hash.new { |h,k| h[k] = [] }
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end
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def each(&block)
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@stack.each(&block)
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end
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def watching?
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!@watching.empty?
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end
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# Returns a list of new constants found since the last call to
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# <tt>watch_namespaces</tt>.
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def new_constants
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constants = []
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# Grab the list of namespaces that we're looking for new constants under
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@watching.last.each do |namespace|
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# Retrieve the constants that were present under the namespace when watch_namespaces
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# was originally called
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original_constants = @stack[namespace].last
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mod = Inflector.constantize(namespace) if Dependencies.qualified_const_defined?(namespace)
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next unless mod.is_a?(Module)
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# Get a list of the constants that were added
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new_constants = mod.local_constants - original_constants
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# self[namespace] returns an Array of the constants that are being evaluated
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# for that namespace. For instance, if parent.rb requires child.rb, the first
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# element of self[Object] will be an Array of the constants that were present
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# before parent.rb was required. The second element will be an Array of the
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# constants that were present before child.rb was required.
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@stack[namespace].each do |namespace_constants|
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namespace_constants.concat(new_constants)
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end
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# Normalize the list of new constants, and add them to the list we will return
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new_constants.each do |suffix|
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constants << ([namespace, suffix] - ["Object"]).join("::")
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end
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end
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constants
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ensure
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# A call to new_constants is always called after a call to watch_namespaces
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pop_modules(@watching.pop)
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end
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# Add a set of modules to the watch stack, remembering the initial
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# constants.
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def watch_namespaces(namespaces)
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@watching << namespaces.map do |namespace|
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module_name = Dependencies.to_constant_name(namespace)
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original_constants = Dependencies.qualified_const_defined?(module_name) ?
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Inflector.constantize(module_name).local_constants : []
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@stack[module_name] << original_constants
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module_name
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end
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end
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private
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def pop_modules(modules)
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modules.each { |mod| @stack[mod].pop }
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end
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end
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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 = WatchStack.new
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# Module includes this module.
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module ModuleConstMissing #:nodoc:
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def self.append_features(base)
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base.class_eval do
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# Emulate #exclude via an ivar
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return if defined?(@_const_missing) && @_const_missing
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@_const_missing = instance_method(:const_missing)
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remove_method(:const_missing)
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end
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super
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end
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def self.exclude_from(base)
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base.class_eval do
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define_method :const_missing, @_const_missing
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@_const_missing = nil
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end
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end
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def const_missing(const_name)
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# The interpreter does not pass nesting information, and in the
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# case of anonymous modules we cannot even make the trade-off of
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# assuming their name reflects the nesting. Resort to Object as
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# the only meaningful guess we can make.
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from_mod = anonymous? ? ::Object : self
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Dependencies.load_missing_constant(from_mod, const_name)
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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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# Object includes this module.
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module Loadable #:nodoc:
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def self.exclude_from(base)
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base.class_eval { define_method(:load, Kernel.instance_method(:load)) }
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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, message = "No such file to load -- %s")
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unless file_name.is_a?(String)
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raise ArgumentError, "the file name must be a String -- you passed #{file_name.inspect}"
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end
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Dependencies.depend_on(file_name, message)
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end
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def load_dependency(file)
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if Dependencies.load? && ActiveSupport::Dependencies.constant_watch_stack.watching?
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Dependencies.new_constants_in(Object) { yield }
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else
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yield
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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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def load(file, wrap = false)
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result = false
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load_dependency(file) { result = super }
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result
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end
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def require(file)
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result = false
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load_dependency(file) { result = super }
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result
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end
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# Mark the given constant as unloadable. Unloadable constants are removed
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# each 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
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# for 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,
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# +false+ 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.class_eval { include Loadable }
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Module.class_eval { include ModuleConstMissing }
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Exception.class_eval { include Blamable }
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end
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def unhook!
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ModuleConstMissing.exclude_from(Module)
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Loadable.exclude_from(Object)
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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, message = "No such file to load -- %s.rb")
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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 => load_error
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if file_name = load_error.message[/ -- (.*?)(\.rb)?$/, 1]
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load_error.message.replace(message % file_name)
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load_error.copy_blame!(load_error)
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end
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raise
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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 = $` if file_name =~ /\.rb\z/
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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 if 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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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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Object.qualified_const_defined?(path.sub(/^::/, ''), false)
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end
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# Given +path+, a filesystem path to a ruby file, return an array of
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# constant paths which would cause Dependencies to attempt to load this
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# file.
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def loadable_constants_for_path(path, bases = autoload_paths)
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path = $` if path =~ /\.rb\z/
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expanded_path = File.expand_path(path)
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paths = []
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bases.each do |root|
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expanded_root = File.expand_path(root)
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next unless %r{\A#{Regexp.escape(expanded_root)}(/|\\)} =~ expanded_path
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nesting = expanded_path[(expanded_root.size)..-1]
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nesting = nesting[1..-1] if nesting && nesting[0] == ?/
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next if nesting.blank?
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paths << nesting.camelize
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end
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paths.uniq!
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paths
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end
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# Search for a file in autoload_paths matching the provided suffix.
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def search_for_file(path_suffix)
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path_suffix = path_suffix.sub(/(\.rb)?$/, ".rb")
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autoload_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
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# returned.
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def autoloadable_module?(path_suffix)
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autoload_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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# to_s works around a ruby1.9 issue where #starts_with?(Pathname) will always return false
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autoload_once_paths.any? { |base| path.starts_with? base.to_s }
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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 expected path suffix. If found, the module is created and
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# assigned to +into+'s constants with the name +const_name+. Provided that
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# the directory was loaded from a reloadable base path, it is added to the
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# set of constants 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 autoload_once_paths.include?(base_path)
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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
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# set 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| const_path[/.*(?=::)/] || :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 = Kernel.load 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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result
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end
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# Returns the constant path for the provided parent and constant name.
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def qualified_name_for(mod, name)
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mod_name = to_constant_name mod
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mod_name == "Object" ? name.to_s : "#{mod_name}::#{name}"
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end
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# Load the constant named +const_name+ which is missing from +from_mod+. If
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# it is not possible to load the constant into from_mod, try its parent
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# module using +const_missing+.
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def load_missing_constant(from_mod, const_name)
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log_call from_mod, const_name
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unless qualified_const_defined?(from_mod.name) && Inflector.constantize(from_mod.name).equal?(from_mod)
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raise ArgumentError, "A copy of #{from_mod} has been removed from the module tree but is still active!"
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end
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raise NameError, "#{from_mod} is not missing constant #{const_name}!" if from_mod.const_defined?(const_name, false)
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qualified_name = qualified_name_for from_mod, const_name
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path_suffix = qualified_name.underscore
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file_path = search_for_file(path_suffix)
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if file_path
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expanded = File.expand_path(file_path)
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expanded.sub!(/\.rb\z/, '')
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if loaded.include?(expanded)
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raise "Circular dependency detected while autoloading constant #{qualified_name}"
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else
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require_or_load(expanded)
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raise LoadError, "Unable to autoload constant #{qualified_name}, expected #{file_path} to define it" unless from_mod.const_defined?(const_name, false)
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return from_mod.const_get(const_name)
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end
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elsif mod = autoload_module!(from_mod, const_name, qualified_name, path_suffix)
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return mod
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elsif (parent = from_mod.parent) && parent != from_mod &&
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! from_mod.parents.any? { |p| p.const_defined?(const_name, false) }
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# If our parents do not have a constant named +const_name+ then we are free
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# to attempt to load upwards. If they do have such a constant, then this
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# const_missing must be due to from_mod::const_name, which should not
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# return constants from from_mod's parents.
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begin
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# Since Ruby does not pass the nesting at the point the unknown
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# constant triggered the callback we cannot fully emulate constant
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# name lookup and need to make a trade-off: we are going to assume
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# that the nesting in the body of Foo::Bar is [Foo::Bar, Foo] even
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# though it might not be. Counterexamples are
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#
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# class Foo::Bar
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# Module.nesting # => [Foo::Bar]
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# end
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#
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# or
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#
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# module M::N
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# module S::T
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# Module.nesting # => [S::T, M::N]
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# end
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# end
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#
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# for example.
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return parent.const_missing(const_name)
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rescue NameError => e
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raise unless e.missing_name? qualified_name_for(parent, const_name)
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end
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end
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raise NameError,
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"uninitialized constant #{qualified_name}",
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caller.reject { |l| l.starts_with? __FILE__ }
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end
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# Remove the constants that have been autoloaded, and those that have been
|
||
# marked for unloading. Before each constant is removed a callback is sent
|
||
# to its class/module if it implements +before_remove_const+.
|
||
#
|
||
# The callback implementation should be restricted to cleaning up caches, etc.
|
||
# as the environment will be in an inconsistent state, e.g. other constants
|
||
# may have already been unloaded and not accessible.
|
||
def remove_unloadable_constants!
|
||
autoloaded_constants.each { |const| remove_constant const }
|
||
autoloaded_constants.clear
|
||
Reference.clear!
|
||
explicitly_unloadable_constants.each { |const| remove_constant const }
|
||
end
|
||
|
||
class ClassCache
|
||
def initialize
|
||
@store = Hash.new
|
||
end
|
||
|
||
def empty?
|
||
@store.empty?
|
||
end
|
||
|
||
def key?(key)
|
||
@store.key?(key)
|
||
end
|
||
|
||
def get(key)
|
||
key = key.name if key.respond_to?(:name)
|
||
@store[key] ||= Inflector.constantize(key)
|
||
end
|
||
alias :[] :get
|
||
|
||
def safe_get(key)
|
||
key = key.name if key.respond_to?(:name)
|
||
@store[key] ||= Inflector.safe_constantize(key)
|
||
end
|
||
|
||
def store(klass)
|
||
return self unless klass.respond_to?(:name)
|
||
raise(ArgumentError, 'anonymous classes cannot be cached') if klass.name.empty?
|
||
@store[klass.name] = klass
|
||
self
|
||
end
|
||
|
||
def clear!
|
||
@store.clear
|
||
end
|
||
end
|
||
|
||
Reference = ClassCache.new
|
||
|
||
# Store a reference to a class +klass+.
|
||
def reference(klass)
|
||
Reference.store klass
|
||
end
|
||
|
||
# Get the reference for class named +name+.
|
||
# Raises an exception if referenced class does not exist.
|
||
def constantize(name)
|
||
Reference.get(name)
|
||
end
|
||
|
||
# Get the reference for class named +name+ if one exists.
|
||
# Otherwise returns +nil+.
|
||
def safe_constantize(name)
|
||
Reference.safe_get(name)
|
||
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.anonymous?
|
||
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
|
||
false
|
||
else
|
||
explicitly_unloadable_constants << name
|
||
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)
|
||
|
||
constant_watch_stack.watch_namespaces(descs)
|
||
aborting = true
|
||
|
||
begin
|
||
yield # Now yield to the code that is to define new constants.
|
||
aborting = false
|
||
ensure
|
||
new_constants = constant_watch_stack.new_constants
|
||
|
||
log "New constants: #{new_constants * ', '}"
|
||
return new_constants unless aborting
|
||
|
||
log "Error during loading, removing partially loaded constants "
|
||
new_constants.each { |c| remove_constant(c) }.clear
|
||
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:
|
||
case desc
|
||
when String then desc.sub(/^::/, '')
|
||
when Symbol then desc.to_s
|
||
when Module
|
||
desc.name.presence ||
|
||
raise(ArgumentError, "Anonymous modules have no name to be referenced by")
|
||
else raise TypeError, "Not a valid constant descriptor: #{desc.inspect}"
|
||
end
|
||
end
|
||
|
||
def remove_constant(const) #:nodoc:
|
||
return false unless qualified_const_defined? const
|
||
|
||
# Normalize ::Foo, Foo, Object::Foo, and ::Object::Foo to Object::Foo
|
||
names = const.to_s.sub(/^::(Object)?/, 'Object::').split("::")
|
||
to_remove = names.pop
|
||
parent = Inflector.constantize(names * '::')
|
||
|
||
log "removing constant #{const}"
|
||
constantized = constantize(const)
|
||
constantized.before_remove_const if constantized.respond_to?(:before_remove_const)
|
||
parent.instance_eval { remove_const to_remove }
|
||
|
||
true
|
||
end
|
||
|
||
protected
|
||
def log_call(*args)
|
||
if 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)
|
||
logger.debug "Dependencies: #{msg}" if log_activity?
|
||
end
|
||
|
||
def log_activity?
|
||
logger && log_activity
|
||
end
|
||
end
|
||
end
|
||
|
||
ActiveSupport::Dependencies.hook!
|