299 lines
8.1 KiB
Ruby
299 lines
8.1 KiB
Ruby
require_dependency 'distributed_cache'
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require_dependency 'stylesheet/compiler'
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module Stylesheet; end
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class Stylesheet::Manager
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CACHE_PATH ||= 'tmp/stylesheet-cache'
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MANIFEST_DIR ||= "#{Rails.root}/tmp/cache/assets/#{Rails.env}"
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MANIFEST_FULL_PATH ||= "#{MANIFEST_DIR}/stylesheet-manifest"
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@lock = Mutex.new
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def self.cache
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@cache ||= DistributedCache.new("discourse_stylesheet")
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end
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def self.clear_theme_cache!
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cache.hash.keys.select { |k| k =~ /theme/ }.each { |k|cache.delete(k) }
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end
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def self.stylesheet_href(target = :desktop, theme_key = :missing)
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href = stylesheet_link_tag(target, 'all', theme_key)
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if href
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href.split(/["']/)[1]
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end
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end
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def self.stylesheet_link_tag(target = :desktop, media = 'all', theme_key = :missing)
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target = target.to_sym
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if theme_key == :missing
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theme_key = SiteSetting.default_theme_key
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end
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current_hostname = Discourse.current_hostname
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cache_key = "#{target}_#{theme_key}_#{current_hostname}"
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tag = cache[cache_key]
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return tag.dup.html_safe if tag
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@lock.synchronize do
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builder = self.new(target, theme_key)
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if builder.is_theme? && !builder.theme
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tag = ""
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else
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builder.compile unless File.exists?(builder.stylesheet_fullpath)
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tag = %[<link href="#{builder.stylesheet_path(current_hostname)}" media="#{media}" rel="stylesheet" data-target="#{target}"/>]
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end
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cache[cache_key] = tag
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tag.dup.html_safe
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end
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end
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def self.precompile_css
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themes = Theme.where('user_selectable OR key = ?', SiteSetting.default_theme_key).pluck(:key, :name)
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themes << nil
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themes.each do |key, name|
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[:desktop, :mobile, :desktop_rtl, :mobile_rtl].each do |target|
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theme_key = key || SiteSetting.default_theme_key
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cache_key = "#{target}_#{theme_key}"
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STDERR.puts "precompile target: #{target} #{name}"
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builder = self.new(target, theme_key)
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builder.compile(force: true)
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cache[cache_key] = nil
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end
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end
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nil
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end
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def self.last_file_updated
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if Rails.env.production?
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@last_file_updated ||= if File.exists?(MANIFEST_FULL_PATH)
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File.readlines(MANIFEST_FULL_PATH, 'r')[0]
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else
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mtime = max_file_mtime
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FileUtils.mkdir_p(MANIFEST_DIR)
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File.open(MANIFEST_FULL_PATH, "w") { |f| f.print(mtime) }
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mtime
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end
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else
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max_file_mtime
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end
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end
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def self.max_file_mtime
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globs = ["#{Rails.root}/app/assets/stylesheets/**/*.*css",
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"#{Rails.root}/app/assets/images/**/*.*"]
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Discourse.plugins.map { |plugin| File.dirname(plugin.path) }.each do |path|
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globs << "#{path}/plugin.rb"
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globs << "#{path}/**/*.*css"
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end
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globs.map do |pattern|
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Dir.glob(pattern).map { |x| File.mtime(x) }.max
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end.compact.max.to_i
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end
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def initialize(target = :desktop, theme_key)
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@target = target
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@theme_key = theme_key
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end
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def compile(opts = {})
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unless opts[:force]
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if File.exists?(stylesheet_fullpath)
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unless StylesheetCache.where(target: qualified_target, digest: digest).exists?
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begin
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source_map = begin
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File.read(source_map_fullpath)
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rescue Errno::ENOENT
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end
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StylesheetCache.add(qualified_target, digest, File.read(stylesheet_fullpath), source_map)
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rescue => e
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Rails.logger.warn "Completely unexpected error adding contents of '#{stylesheet_fullpath}' to cache #{e}"
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end
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end
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return true
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end
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end
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rtl = @target.to_s =~ /_rtl$/
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css, source_map = begin
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Stylesheet::Compiler.compile_asset(
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@target,
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rtl: rtl,
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theme_id: theme&.id,
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source_map_file: source_map_filename
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)
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rescue SassC::SyntaxError => e
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Rails.logger.error "Failed to compile #{@target} stylesheet: #{e.message}"
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if %w{embedded_theme mobile_theme desktop_theme}.include?(@target.to_s)
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# no special errors for theme, handled in theme editor
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["", nil]
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else
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[Stylesheet::Compiler.error_as_css(e, "#{@target} stylesheet"), nil]
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end
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end
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FileUtils.mkdir_p(cache_fullpath)
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File.open(stylesheet_fullpath, "w") do |f|
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f.puts css
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end
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if source_map.present?
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File.open(source_map_fullpath, "w") do |f|
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f.puts source_map
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end
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end
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begin
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StylesheetCache.add(qualified_target, digest, css, source_map)
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rescue => e
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Rails.logger.warn "Completely unexpected error adding item to cache #{e}"
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end
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css
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end
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def self.cache_fullpath
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"#{Rails.root}/#{CACHE_PATH}"
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end
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def cache_fullpath
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self.class.cache_fullpath
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end
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def stylesheet_fullpath
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"#{cache_fullpath}/#{stylesheet_filename}"
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end
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def source_map_fullpath
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"#{cache_fullpath}/#{source_map_filename}"
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end
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def source_map_filename
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"#{stylesheet_filename}.map"
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end
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def stylesheet_fullpath_no_digest
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"#{cache_fullpath}/#{stylesheet_filename_no_digest}"
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end
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def stylesheet_cdnpath(hostname)
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"#{GlobalSetting.cdn_url}#{stylesheet_relpath}?__ws=#{hostname}"
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end
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def stylesheet_path(hostname)
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stylesheet_cdnpath(hostname)
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end
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def root_path
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"#{GlobalSetting.relative_url_root}/"
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end
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def stylesheet_relpath
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"#{root_path}stylesheets/#{stylesheet_filename}"
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end
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def stylesheet_relpath_no_digest
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"#{root_path}stylesheets/#{stylesheet_filename_no_digest}"
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end
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def qualified_target
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if is_theme?
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"#{@target}_#{theme.id}"
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else
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scheme_string = theme && theme.color_scheme ? "_#{theme.color_scheme.id}" : ""
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"#{@target}#{scheme_string}"
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end
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end
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def stylesheet_filename(with_digest = true)
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digest_string = "_#{self.digest}" if with_digest
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"#{qualified_target}#{digest_string}.css"
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end
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def stylesheet_filename_no_digest
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stylesheet_filename(_with_digest = false)
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end
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def is_theme?
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!!(@target.to_s =~ /_theme$/)
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end
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# digest encodes the things that trigger a recompile
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def digest
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@digest ||= begin
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if is_theme?
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theme_digest
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else
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color_scheme_digest
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end
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end
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end
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def theme
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@theme ||= (Theme.find_by(key: @theme_key) || :nil)
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@theme == :nil ? nil : @theme
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end
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def theme_digest
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scss = ""
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if [:mobile_theme, :desktop_theme].include?(@target)
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scss = theme.resolve_baked_field(:common, :scss)
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scss += theme.resolve_baked_field(@target.to_s.sub("_theme", ""), :scss)
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elsif @target == :embedded_theme
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scss = theme.resolve_baked_field(:common, :embedded_scss)
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else
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raise "attempting to look up theme digest for invalid field"
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end
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Digest::SHA1.hexdigest(scss.to_s + color_scheme_digest.to_s + settings_digest + plugins_digest + uploads_digest)
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end
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# this protects us from situations where new versions of a plugin removed a file
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# old instances may still be serving CSS and not aware of the change
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# so we could end up poisoning the cache with a bad file that can not be removed
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def plugins_digest
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assets = []
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assets += DiscoursePluginRegistry.stylesheets.to_a
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assets += DiscoursePluginRegistry.mobile_stylesheets.to_a
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assets += DiscoursePluginRegistry.desktop_stylesheets.to_a
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Digest::SHA1.hexdigest(assets.sort.join)
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end
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def settings_digest
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Digest::SHA1.hexdigest((theme&.included_settings || {}).to_json)
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end
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def uploads_digest
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Digest::SHA1.hexdigest(ThemeField.joins(:upload).where(id: theme&.all_theme_variables).pluck(:sha1).join(","))
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end
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def color_scheme_digest
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cs = theme&.color_scheme
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category_updated = Category.where("uploaded_background_id IS NOT NULL").pluck(:updated_at).map(&:to_i).sum
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if cs || category_updated > 0
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Digest::SHA1.hexdigest "#{RailsMultisite::ConnectionManagement.current_db}-#{cs&.id}-#{cs&.version}-#{Stylesheet::Manager.last_file_updated}-#{category_updated}"
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else
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digest_string = "defaults-#{Stylesheet::Manager.last_file_updated}"
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if cdn_url = GlobalSetting.cdn_url
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digest_string = "#{digest_string}-#{cdn_url}"
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end
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Digest::SHA1.hexdigest digest_string
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end
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end
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end
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