112 lines
2.8 KiB
Ruby
112 lines
2.8 KiB
Ruby
module Gitlab
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module Utils
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module Override
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class Extension
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def self.verify_class!(klass, method_name)
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instance_method_defined?(klass, method_name) ||
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raise(
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NotImplementedError.new(
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"#{klass}\##{method_name} doesn't exist!"))
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end
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def self.instance_method_defined?(klass, name, include_super: true)
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klass.instance_methods(include_super).include?(name) ||
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klass.private_instance_methods(include_super).include?(name)
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end
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attr_reader :subject
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def initialize(subject)
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@subject = subject
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end
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def add_method_name(method_name)
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method_names << method_name
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end
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def add_class(klass)
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classes << klass
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end
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def verify!
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classes.each do |klass|
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index = klass.ancestors.index(subject)
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parents = klass.ancestors.drop(index + 1)
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method_names.each do |method_name|
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parents.any? do |parent|
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self.class.instance_method_defined?(
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parent, method_name, include_super: false)
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end ||
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raise(
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NotImplementedError.new(
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"#{klass}\##{method_name} doesn't exist!"))
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end
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end
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end
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private
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def method_names
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@method_names ||= []
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end
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def classes
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@classes ||= []
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end
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end
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# Instead of writing patterns like this:
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#
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# def f
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# raise NotImplementedError unless defined?(super)
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#
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# true
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# end
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#
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# We could write it like:
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#
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# extend ::Gitlab::Utils::Override
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#
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# override :f
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# def f
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# true
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# end
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#
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# This would make sure we're overriding something. See:
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# https://gitlab.com/gitlab-org/gitlab-ee/issues/1819
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def override(method_name)
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return unless ENV['STATIC_VERIFICATION']
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if is_a?(Class)
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Extension.verify_class!(self, method_name)
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else # We delay the check for modules
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Override.extensions[self] ||= Extension.new(self)
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Override.extensions[self].add_method_name(method_name)
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end
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end
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def included(base = nil)
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return super if base.nil? # Rails concern, ignoring it
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super
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if base.is_a?(Class) # We could check for Class in `override`
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# This could be `nil` if `override` was never called
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Override.extensions[self]&.add_class(base)
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end
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end
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alias_method :prepended, :included
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def self.extensions
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@extensions ||= {}
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end
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def self.verify!
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extensions.values.each(&:verify!)
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end
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end
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end
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end
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