Class: Isomorfeus::AssetManager::RackMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/isomorfeus/asset_manager/rack_middleware.rb

Constant Summary collapse

WS_RESPONSE = 
[0, {}, []].freeze
C_ENCODINGS = 
%w[br gzip].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ RackMiddleware

Returns a new instance of RackMiddleware.



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# File 'lib/isomorfeus/asset_manager/rack_middleware.rb', line 11

def initialize(app)
  @app = app
  @asset_manager = Isomorfeus::AssetManager.new
  @assets_path = Isomorfeus.assets_path.end_with?('/') ? Isomorfeus.assets_path : "#{Isomorfeus.assets_path}/"
  @assets_path_size = @assets_path.size
rescue Exception => e
  STDERR.puts "#{e.message}\n#{e.backtrace&.join("\n")}\n"
end

Instance Attribute Details

#asset_manager ⇒ Object (readonly)

Returns the value of attribute asset_manager.



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# File 'lib/isomorfeus/asset_manager/rack_middleware.rb', line 9

def asset_manager
  @asset_manager
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/isomorfeus/asset_manager/rack_middleware.rb', line 20

def call(env)
  path_info = env['PATH_INFO']
  if path_info.start_with?(@assets_path)

    if !Isomorfeus.production?
      if path_info.end_with?('.rb.js')
        asset_key_module_name = path_info[@assets_path_size..-7]
        asset_key, module_name = asset_key_module_name.split('/')
        asset_key += '.js'
        if Isomorfeus.assets.key?(asset_key)
          asset = Isomorfeus.assets[asset_key]
          if asset && asset.browser?
            if asset.bundle_ruby_modules.key?(module_name)
              headers = { Rack::CONTENT_TYPE => 'application/javascript' }
              asset_manager.transition(asset_key, asset)
              return [200, headers, get_content(env, headers, asset, asset_key, asset.bundle_ruby_modules[module_name][:js])]
            end
          end
        end

      elsif path_info.end_with?('.rb.js.map')
        asset_key_module_name = path_info[@assets_path_size..-11]
        asset_key, module_name = asset_key_module_name.split('/')
        asset_key += '.js'
        asset = Isomorfeus.assets[asset_key]
        if asset && asset.browser?
          if asset.bundle_ruby_modules.key?(module_name)
            headers = { Rack::CONTENT_TYPE => 'application/json' }
            asset_manager.transition(asset_key, asset)
            return [200, headers, get_content(env, headers, asset, asset_key, asset.bundle_ruby_modules[module_name][:map])]
          end
        end

      elsif path_info.end_with?('.js.map')
        asset_key = path_info[@assets_path_size..-5]
        asset = Isomorfeus.assets[asset_key]
        if asset && asset.browser?
          headers = { Rack::CONTENT_TYPE => 'application/json' }
          asset_manager.transition(asset_key, asset)
          return [200, headers, get_content(env, headers, asset, asset_key, asset.hash[:js][:map])]
        end

      elsif path_info.end_with?('.css.map')
        # get css source map
        asset_key = path_info[@assets_path_size..-9] + '.js'
        asset = Isomorfeus.assets[asset_key]
        if asset && asset.browser?
          headers = { Rack::CONTENT_TYPE => 'application/json' }
          asset_manager.transition(asset_key, asset)
          return [200, headers, get_content(env, headers, asset, asset_key, asset.hash[:css][:map])]
        end
      end
    end

    if path_info.end_with?('.js')
      asset_key = path_info[@assets_path_size..-1]
      if Isomorfeus.assets.key?(asset_key)
        asset = Isomorfeus.assets[asset_key]
        if asset && asset.browser?
          headers = { Rack::CONTENT_TYPE => 'application/javascript' }
          asset_manager.transition(asset_key, asset)
          return [200, headers, get_content(env, headers, asset, asset_key, asset.hash[:js][:js])]
        end
      end

    elsif path_info.end_with?('.css')
      asset_key = path_info[@assets_path_size..-5] + '.js'
      asset = Isomorfeus.assets[asset_key]
      if asset && asset.browser?
        headers = { Rack::CONTENT_TYPE => 'text/css' }
        asset_manager.transition(asset_key, asset)
        return [200, headers, get_content(env, headers, asset, asset_key, asset.hash[:css][:css])]
      end
    end

    return [404, {}, 'not found']
  # hot reloading subscription
  elsif Isomorfeus.development? && path_info == Isomorfeus.hmr_websocket_path
    if env['rack.upgrade?'] == :websocket
      env['rack.upgrade'] = Isomorfeus::AssetManager::ServerSocketProcessor.new
    end
    WS_RESPONSE
  else
    @app.call(env)
  end
rescue Exception => e
  STDERR.puts "#{e.message}\n#{e.backtrace&.join("\n")}\n"
  @app.call(env)
end

#get_content(env, headers, asset, asset_key, content_hash) ⇒ Object 



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# File 'lib/isomorfeus/asset_manager/rack_middleware.rb', line 110

def get_content(env, headers, asset, asset_key, content_hash)
  request = Rack::Request.new(env)
  best_encoding = Rack::Utils.select_best_encoding(C_ENCODINGS, request.accept_encoding)
  content = ''
  case best_encoding
  when 'gzip'
    headers['Content-Encoding'] = "gzip"
    unless content_hash.key?(:gzip)
      asset.mutex.synchronize { content_hash[:gzip] = Zlib::gzip(content_hash[:raw], level: Zlib::BEST_COMPRESSION) unless content_hash.key?(:gzip) }
    end
    content = content_hash[:gzip]
  when 'br'
    headers['Content-Encoding'] = "br"
    unless content_hash.key?(:br)
      asset.mutex.synchronize { content_hash[:br] = Brotli.deflate(content_hash[:raw], quality: Isomorfeus.production? ? 9 : 5) unless content_hash.key?(:br) }
    end
    content = content_hash[:br]
  else
    content = content_hash[:raw]
  end
  headers[Rack::CONTENT_LENGTH] = content.size
  headers['Last-Modified'] = asset.mtime
  [content]
end