Module: Isomorfeus::PreactViewHelper

Defined in:
lib/isomorfeus/preact_view_helper.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/isomorfeus/preact_view_helper.rb', line 3

def self.included(base)
  base.include Isomorfeus::AssetManager::ViewHelper
end

Instance Method Details

#cached_mount_component(component_name, props = {}, asset_key = 'ssr.js') ⇒ Object 



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# File 'lib/isomorfeus/preact_view_helper.rb', line 7

def cached_mount_component(component_name, props = {}, asset_key = 'ssr.js')
  key = "#{component_name}#{props}#{asset}"
  if Isomorfeus.production?
    render_result, @ssr_response_status, @ssr_styles = component_cache.fetch(key)
    return render_result if render_result
  end
  render_result = mount_component(component_name, props, asset_key)
  status = ssr_response_status
  component_cache.store(key, render_result, status, ssr_styles) if status >= 200 && status < 300
  render_result
end

#mount_component(component_name, props = {}, asset_key = 'ssr.js', skip_ssr: false, use_ssr: false) ⇒ Object 



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# File 'lib/isomorfeus/preact_view_helper.rb', line 19

def mount_component(component_name, props = {}, asset_key = 'ssr.js', skip_ssr: false, use_ssr: false)
  @ssr_response_status = nil
  @ssr_styles = nil
  thread_id_asset = "#{Thread.current.object_id}#{asset_key}"
  render_result = "<div data-iso-env=\"#{Isomorfeus.env}\" data-iso-root=\"#{component_name}\" data-iso-props='#{Oj.dump(props, mode: :strict)}'"
  if !skip_ssr && (Isomorfeus.server_side_rendering || use_ssr)
    if Isomorfeus.development?
      # always create a new context, effectively reloading code
      # delete the existing context first, saves memory
      if Isomorfeus.ssr_contexts.key?(thread_id_asset)
        uuid = Isomorfeus.ssr_contexts[thread_id_asset].instance_variable_get(:@uuid)
        runtime = Isomorfeus.ssr_contexts[thread_id_asset].instance_variable_get(:@runtime)
        runtime.vm.delete_context(uuid)
      end
      begin
        init_speednode_context(asset_key, thread_id_asset)
      rescue Exception => e
        Isomorfeus.raise_error(message: "Server Side Rendering: Failed creating context for #{asset_key}. Error: #{e.message}", stack: e.backtrace)
      end
    else
      unless Isomorfeus.ssr_contexts.key?(thread_id_asset)
        init_speednode_context(asset_key, thread_id_asset)
      end
    end

    # if location_host and scheme are given and if Transport is loaded, connect and then render,
    # otherwise do not render because only one pass is required
    ws_scheme = props[:location_scheme] == 'https:' ? 'wss:' : 'ws:'
    location_host = props[:location_host] ? props[:location_host] : 'localhost'
    api_ws_path = Isomorfeus.respond_to?(:api_websocket_path) ? Isomorfeus.api_websocket_path : ''
    transport_ws_url = ws_scheme + location_host + api_ws_path

    # build javascript for rendering first pass
    # it will initialize buffers to guard against leaks, maybe caused by previous exceptions
    javascript = <<~JAVASCRIPT
      global.Opal.Preact.render_buffer = [];
      global.Opal.Preact.active_components = [];
      global.Opal.Preact.active_redux_components = [];
      global.FirstPassFinished = false;
      global.Exception = false;
      global.IsomorfeusSessionId = '#{Thread.current[:isomorfeus_session_id]}';
      global.Opal.Isomorfeus['$env=']('#{Isomorfeus.env}');
      if (typeof global.Opal.Isomorfeus.$negotiated_locale === 'function') {
        global.Opal.Isomorfeus["$negotiated_locale="]('#{props[:locale]}');
      }
      global.Opal.Isomorfeus['$force_init!']();
      global.Opal.Isomorfeus['$ssr_response_status='](200);
      global.Opal.Isomorfeus.TopLevel['$ssr_route_path=']('#{props[:location]}');
      let api_ws_path = '#{api_ws_path}';
      let exception;
      if (typeof global.Opal.Isomorfeus.Transport !== 'undefined' && api_ws_path !== '') {
        global.Opal.Isomorfeus.TopLevel["$transport_ws_url="]("#{transport_ws_url}");
        global.Opal.send(global.Opal.Isomorfeus.Transport.$promise_connect(), 'then', [], ($$1 = function(){
          try {
            global.Opal.Isomorfeus.TopLevel.$render_component_to_string('#{component_name}', #{Oj.dump(props, mode: :strict)});
            global.FirstPassFinished = 'transport';
          } catch (e) {
            global.Exception = e;
            global.FirstPassFinished = 'transport';
          }
        }, $$1.$$s = this, $$1.$$arity = 0, $$1))
      } else { return global.FirstPassFinished = true; };
    JAVASCRIPT
    # execute first render pass
    begin
      first_pass_skipped = Isomorfeus.ssr_contexts[thread_id_asset].exec(javascript)
    rescue Exception => e
      Isomorfeus.raise_error(error: e)
    end
    # wait for first pass to finish
    unless first_pass_skipped
      first_pass_finished, exception = Isomorfeus.ssr_contexts[thread_id_asset].exec('return [global.FirstPassFinished, global.Exception ? { message: global.Exception.message, stack: global.Exception.stack } : false ]')
      Isomorfeus.raise_error(message: "Server Side Rendering: #{exception['message']}", stack: exception['stack']) if exception
      unless first_pass_finished
        start_time = Time.now
        while !first_pass_finished
          break if (Time.now - start_time) > 10
          sleep 0.01
          first_pass_finished = Isomorfeus.ssr_contexts[thread_id_asset].exec('return global.FirstPassFinished')
        end
      end
      # wait for transport requests to finish
      if first_pass_finished == 'transport'
        transport_busy = Isomorfeus.ssr_contexts[thread_id_asset].exec('return global.Opal.Isomorfeus.Transport["$busy?"]()')
        if transport_busy
          start_time = Time.now
          while transport_busy
            break if (Time.now - start_time) > 10
            sleep 0.01
            transport_busy = Isomorfeus.ssr_contexts[thread_id_asset].exec('return global.Opal.Isomorfeus.Transport["$busy?"]()')
          end
        end
      end
    end
    # build javascript for second render pass
    # guard against leaks from first pass, maybe because of a exception
    javascript = <<~JAVASCRIPT
      global.Opal.Preact.render_buffer = [];
      global.Opal.Preact.active_components = [];
      global.Opal.Preact.active_redux_components = [];
      global.Exception = false;
      let rendered_tree;
      let ssr_styles;
      let component;
        try {
          rendered_tree = global.Opal.Isomorfeus.TopLevel.$render_component_to_string('#{component_name}', #{Oj.dump(props, mode: :strict)});
        } catch (e) {
          global.Exception = e;
        }
      let application_state = global.Opal.Isomorfeus.store.native.getState();
      if (typeof global.Opal.Isomorfeus.Transport !== 'undefined') { global.Opal.Isomorfeus.Transport.$disconnect(); }
      if (typeof global.NanoCSSInstance !== 'undefined') { ssr_styles = global.NanoCSSInstance.raw }
      return [rendered_tree, application_state, ssr_styles, global.Opal.Isomorfeus['$ssr_response_status'](), global.Exception ? { message: global.Exception.message, stack: global.Exception.stack } : false];
    JAVASCRIPT
    # execute second render pass
    rendered_tree, application_state, @ssr_styles, @ssr_response_status, exception = Isomorfeus.ssr_contexts[thread_id_asset].exec(javascript)
    Isomorfeus.raise_error(message: exception['message'], stack: exception['stack']) if exception
    render_result << " data-iso-hydrated='true'" if rendered_tree
    if Isomorfeus.respond_to?(:current_user) && Isomorfeus.current_user && !Isomorfeus.current_user.anonymous?
      render_result << " data-iso-usid=#{Oj.dump(Isomorfeus.current_user.to_sid, mode: :strict)}"
    end
    render_result << " data-iso-nloc='#{props[:locale]}'>"
    render_result << (rendered_tree ? rendered_tree : "SSR didn't work")
  else
    if Isomorfeus.respond_to?(:current_user) && Isomorfeus.current_user && !Isomorfeus.current_user.anonymous?
      render_result << " data-iso-usid=#{Oj.dump(Isomorfeus.current_user.to_sid, mode: :strict)}"
    end
    render_result << " data-iso-nloc='#{props[:locale]}'>"
  end
  render_result << '</div>'
  if Isomorfeus.server_side_rendering
    render_result = "<script type='application/javascript'>\nServerSideRenderingStateJSON = #{Oj.dump(application_state, mode: :strict)}\n</script>\n" << render_result
  end
  render_result
end

#ssr_response_status ⇒ Object 



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# File 'lib/isomorfeus/preact_view_helper.rb', line 155

def ssr_response_status
  @ssr_response_status || 200
end

#ssr_styles ⇒ Object 



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# File 'lib/isomorfeus/preact_view_helper.rb', line 159

def ssr_styles
  @ssr_styles || ''
end