require_dependency 'sass/discourse_sass_compiler' require_dependency 'distributed_cache' class DiscourseStylesheets CACHE_PATH ||= 'tmp/stylesheet-cache' MANIFEST_DIR ||= "#{Rails.root}/tmp/cache/assets/#{Rails.env}" MANIFEST_FULL_PATH ||= "#{MANIFEST_DIR}/stylesheet-manifest" @lock = Mutex.new def self.cache return {} if Rails.env.development? @cache ||= DistributedCache.new("discourse_stylesheet") end def self.stylesheet_link_tag(target = :desktop) tag = cache[target] return tag.dup.html_safe if tag @lock.synchronize do builder = self.new(target) builder.compile unless File.exists?(builder.stylesheet_fullpath) builder.ensure_digestless_file tag = %[] cache[target] = tag tag.dup.html_safe end end def self.compile(target = :desktop, opts={}) @lock.synchronize do FileUtils.rm(MANIFEST_FULL_PATH, force: true) if opts[:force] builder = self.new(target) builder.compile(opts) builder.stylesheet_filename end end def self.last_file_updated if Rails.env.production? @last_file_updated ||= if File.exists?(MANIFEST_FULL_PATH) File.readlines(MANIFEST_FULL_PATH, 'r')[0] else mtime = max_file_mtime FileUtils.mkdir_p(MANIFEST_DIR) File.open(MANIFEST_FULL_PATH, "w") { |f| f.print(mtime) } mtime end else max_file_mtime end end def self.max_file_mtime globs = ["#{Rails.root}/app/assets/stylesheets/**/*.*css"] for path in (Discourse.plugins || []).map { |plugin| File.dirname(plugin.path) } globs += [ "#{path}/plugin.rb", "#{path}/**/*.*css", ] end globs.map do |pattern| Dir.glob(pattern).map { |x| File.mtime(x) }.max end.compact.max.to_i end def initialize(target = :desktop) @target = target end def compile(opts={}) unless opts[:force] if File.exists?(stylesheet_fullpath) unless StylesheetCache.where(target: @target, digest: digest).exists? begin StylesheetCache.add(@target, digest, File.read(stylesheet_fullpath)) rescue => e Rails.logger.warn "Completely unexpected error adding contents of '#{stylesheet_fullpath}' to cache #{e}" end end return true end end scss = File.read("#{Rails.root}/app/assets/stylesheets/#{@target}.scss") rtl = @target.to_s =~ /_rtl$/ css = begin DiscourseSassCompiler.compile(scss, @target, rtl: rtl) rescue Sass::SyntaxError => e Rails.logger.error "Stylesheet failed to compile for '#{@target}'! Recompiling without plugins and theming." Rails.logger.error e.sass_backtrace_str("#{@target} stylesheet") DiscourseSassCompiler.compile(scss + DiscourseSassCompiler.error_as_css(e, "#{@target} stylesheet"), @target, safe: true) end FileUtils.mkdir_p(cache_fullpath) File.open(stylesheet_fullpath, "w") do |f| f.puts css end begin StylesheetCache.add(@target, digest, css) rescue => e Rails.logger.warn "Completely unexpected error adding item to cache #{e}" end css end def ensure_digestless_file # file without digest is only for auto-reloading css in dev env unless Rails.env.production? || (File.exist?(stylesheet_fullpath_no_digest) && File.mtime(stylesheet_fullpath) == File.mtime(stylesheet_fullpath_no_digest)) FileUtils.cp(stylesheet_fullpath, stylesheet_fullpath_no_digest) end end def self.cache_fullpath "#{Rails.root}/#{CACHE_PATH}" end def cache_fullpath self.class.cache_fullpath end def stylesheet_fullpath "#{cache_fullpath}/#{stylesheet_filename}" end def stylesheet_fullpath_no_digest "#{cache_fullpath}/#{stylesheet_filename_no_digest}" end def stylesheet_cdnpath "#{GlobalSetting.cdn_url}#{stylesheet_relpath}?__ws=#{Discourse.current_hostname}" end def root_path "#{GlobalSetting.relative_url_root}/" end # using uploads cause we already have all the routing in place def stylesheet_relpath "#{root_path}stylesheets/#{stylesheet_filename}" end def stylesheet_relpath_no_digest "#{root_path}stylesheets/#{stylesheet_filename_no_digest}" end def stylesheet_filename "#{@target}_#{digest}.css" end def stylesheet_filename_no_digest "#{@target}.css" end # digest encodes the things that trigger a recompile def digest @digest ||= begin theme = (cs = ColorScheme.enabled) ? "#{cs.id}-#{cs.version}" : false category_updated = Category.where("background_url IS NOT NULL and background_url != ''").last_updated_at if theme || category_updated > 0 Digest::SHA1.hexdigest "#{RailsMultisite::ConnectionManagement.current_db}-#{theme}-#{DiscourseStylesheets.last_file_updated}-#{category_updated}" else Digest::SHA1.hexdigest "defaults-#{DiscourseStylesheets.last_file_updated}" end end end end