125 lines
3.9 KiB
Ruby
125 lines
3.9 KiB
Ruby
require "concurrent/map"
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require "action_view/dependency_tracker"
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require "monitor"
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module ActionView
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class Digestor
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@@digest_mutex = Mutex.new
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module PerExecutionDigestCacheExpiry
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def self.before(target)
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ActionView::LookupContext::DetailsKey.clear
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end
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end
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class << self
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# Supported options:
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#
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# * <tt>name</tt> - Template name
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# * <tt>finder</tt> - An instance of <tt>ActionView::LookupContext</tt>
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# * <tt>dependencies</tt> - An array of dependent views
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def digest(name:, finder:, dependencies: [])
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dependencies ||= []
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cache_key = [ name, finder.rendered_format, dependencies ].flatten.compact.join(".")
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# this is a correctly done double-checked locking idiom
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# (Concurrent::Map's lookups have volatile semantics)
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finder.digest_cache[cache_key] || @@digest_mutex.synchronize do
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finder.digest_cache.fetch(cache_key) do # re-check under lock
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partial = name.include?("/_")
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root = tree(name, finder, partial)
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dependencies.each do |injected_dep|
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root.children << Injected.new(injected_dep, nil, nil)
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end
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finder.digest_cache[cache_key] = root.digest(finder)
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end
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end
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end
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def logger
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ActionView::Base.logger || NullLogger
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end
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# Create a dependency tree for template named +name+.
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def tree(name, finder, partial = false, seen = {})
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logical_name = name.gsub(%r|/_|, "/")
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options = {}
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options[:formats] = [finder.rendered_format] if finder.rendered_format
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if template = finder.disable_cache { finder.find_all(logical_name, [], partial, [], options).first }
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finder.rendered_format ||= template.formats.first
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if node = seen[template.identifier] # handle cycles in the tree
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node
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else
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node = seen[template.identifier] = Node.create(name, logical_name, template, partial)
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deps = DependencyTracker.find_dependencies(name, template, finder.view_paths)
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deps.uniq { |n| n.gsub(%r|/_|, "/") }.each do |dep_file|
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node.children << tree(dep_file, finder, true, seen)
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end
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node
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end
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else
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logger.error " '#{name}' file doesn't exist, so no dependencies"
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logger.error " Couldn't find template for digesting: #{name}"
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seen[name] ||= Missing.new(name, logical_name, nil)
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end
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end
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end
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class Node
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attr_reader :name, :logical_name, :template, :children
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def self.create(name, logical_name, template, partial)
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klass = partial ? Partial : Node
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klass.new(name, logical_name, template, [])
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end
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def initialize(name, logical_name, template, children = [])
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@name = name
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@logical_name = logical_name
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@template = template
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@children = children
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end
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def digest(finder, stack = [])
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Digest::MD5.hexdigest("#{template.source}-#{dependency_digest(finder, stack)}")
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end
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def dependency_digest(finder, stack)
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children.map do |node|
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if stack.include?(node)
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false
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else
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finder.digest_cache[node.name] ||= begin
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stack.push node
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node.digest(finder, stack).tap { stack.pop }
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end
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end
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end.join("-")
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end
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def to_dep_map
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children.any? ? { name => children.map(&:to_dep_map) } : name
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end
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end
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class Partial < Node; end
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class Missing < Node
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def digest(finder, _ = []) "" end
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end
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class Injected < Node
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def digest(finder, _ = []) name end
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end
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class NullLogger
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def self.debug(_); end
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def self.error(_); end
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end
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end
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end
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