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Before this change, calling `StyleSheet::Manager.stylesheet_details` for the first time resulted in multiple queries to the database. This is because the code was modelled in a way where each `Theme` was loaded from the database one at a time. This PR restructures the code such that it allows us to load all the theme records in a single query. It also allows us to eager load the required associations upfront. In order to achieve this, I removed the support of loading multiple themes per request. It was initially added to support user selectable theme components but the feature was never completed and abandoned because it wasn't a feature that we thought was worth building.
132 lines
3.5 KiB
Ruby
132 lines
3.5 KiB
Ruby
# frozen_string_literal: true
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class StylesheetsController < ApplicationController
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skip_before_action :preload_json, :redirect_to_login_if_required, :check_xhr, :verify_authenticity_token, only: [:show, :show_source_map, :color_scheme]
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before_action :apply_cdn_headers, only: [:show, :show_source_map, :color_scheme]
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def show_source_map
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show_resource(source_map: true)
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end
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def show
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is_asset_path
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show_resource
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end
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def color_scheme
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params.require("id")
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params.permit("theme_id")
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manager = Stylesheet::Manager.new(theme_id: params[:theme_id])
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stylesheet = manager.color_scheme_stylesheet_details(params[:id], 'all')
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render json: stylesheet
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end
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protected
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def show_resource(source_map: false)
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extension = source_map ? ".css.map" : ".css"
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params[:name]
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no_cookies
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target, digest = params[:name].split(/_([a-f0-9]{40})/)
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if !Rails.env.production?
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# TODO add theme
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# calling this method ensures we have a cache for said target
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# we hold off re-compilation till someone asks for asset
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if target.include?("color_definitions")
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split_target, color_scheme_id = target.split(/_(-?[0-9]+)/)
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Stylesheet::Manager.new.color_scheme_stylesheet_link_tag(color_scheme_id)
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else
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theme_id =
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if target.include?("theme")
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split_target, theme_id = target.split(/_(-?[0-9]+)/)
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Theme.where(id: theme_id).pluck_first(:id) if theme_id.present?
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else
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split_target, color_scheme_id = target.split(/_(-?[0-9]+)/)
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Theme.where(color_scheme_id: color_scheme_id).pluck_first(:id)
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end
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Stylesheet::Manager.new(theme_id: theme_id).stylesheet_link_tag(split_target, nil)
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end
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end
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cache_time = request.env["HTTP_IF_MODIFIED_SINCE"]
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if cache_time
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begin
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cache_time = Time.rfc2822(cache_time)
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rescue ArgumentError
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end
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end
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query = StylesheetCache.where(target: target)
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if digest
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query = query.where(digest: digest)
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else
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query = query.order('id desc')
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end
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# Security note, safe due to route constraint
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underscore_digest = digest ? "_" + digest : ""
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cache_path = "#{Rails.root}/#{Stylesheet::Manager::CACHE_PATH}"
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location = "#{cache_path}/#{target}#{underscore_digest}#{extension}"
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stylesheet_time = query.pluck_first(:created_at)
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if !stylesheet_time
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handle_missing_cache(location, target, digest)
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end
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if cache_time && stylesheet_time && stylesheet_time <= cache_time
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return render body: nil, status: 304
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end
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unless File.exist?(location)
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if current = query.pluck_first(source_map ? :source_map : :content)
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FileUtils.mkdir_p(cache_path)
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File.write(location, current)
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else
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raise Discourse::NotFound
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end
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end
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if Rails.env == "development"
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response.headers['Last-Modified'] = Time.zone.now.httpdate
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immutable_for(1.second)
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else
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response.headers['Last-Modified'] = stylesheet_time.httpdate if stylesheet_time
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immutable_for(1.year)
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end
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send_file(location, disposition: :inline)
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end
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def handle_missing_cache(location, name, digest)
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location = location.sub(".css.map", ".css")
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source_map_location = location + ".map"
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existing = read_file(location)
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if existing && digest
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source_map = read_file(source_map_location)
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StylesheetCache.add(name, digest, existing, source_map)
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end
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end
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private
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def read_file(location)
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begin
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File.read(location)
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rescue Errno::ENOENT
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end
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end
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end
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