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', skip_ssr: false, use_ssr: false, max_passes: 4, refresh: false) ⇒ 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', skip_ssr: false, use_ssr: false, max_passes: 4, refresh: false)
  key = "#{component_name}#{props}#{asset}"
  if !Isomorfeus.development? && !refresh
    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, skip_ssr: skip_ssr, use_ssr: use_ssr, max_passes: max_passes)
  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, max_passes: 4) ⇒ 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, max_passes: 4)
  ssr_start_time = Time.now if Isomorfeus.development?
  @ssr_response_status = nil
  @ssr_styles = nil
  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)
    thread_id_asset = "#{Thread.current.object_id}|#{asset_key}"
    begin
      init_speednode_context(asset_key, thread_id_asset) if Isomorfeus.development? || !Isomorfeus.ssr_contexts.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

    ctx = Isomorfeus.ssr_contexts[thread_id_asset]
    pass = 0
    # if location_host and scheme are given and if Transport is loaded, connect and then render
    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
    return Opal.Isomorfeus.SSR.mount_component('#{Thread.current[:isomorfeus_session_id]}', '#{Isomorfeus.env}', '#{props[:locale]}', '#{transport_ws_url}', '#{component_name}', #{Oj.dump(props, mode: :strict)}, #{max_passes})
    JAVASCRIPT

    begin
      ctx.exec(javascript)
    rescue Exception => e
      Isomorfeus.raise_error(error: e)
    end

    sleep 0.001 # give other threads that would respond to a request from node/SSR a chance to run
    rendering = ctx.eval_script(key: :rendering)
    if rendering
      start_time = Time.now
      while rendering
        break if (Time.now - start_time) > 10
        sleep 0.005
        rendering = ctx.eval_script(key: :rendering)
      end
    end

    rendered_tree, application_state, @ssr_styles, @ssr_response_status, passes, exception = ctx.eval_script(key: :get_result)
    Isomorfeus.raise_error(message: "Server Side Rendering: #{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.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.sid, mode: :strict)}"
    end
    render_result << " data-iso-nloc='#{props[:locale]}'>"
  end
  render_result << '</div>'
  if Isomorfeus.server_side_rendering && !skip_ssr
    render_result = "<script type='application/javascript'>\nServerSideRenderingStateJSON = #{Oj.dump(application_state, mode: :strict)}\n</script>\n" << render_result
    puts "PreactViewHelper Server Side Rendering rendered #{passes} passes and took ~#{((Time.now - ssr_start_time)*1000).to_i}ms" if Isomorfeus.development?
  end
  render_result
end

#ssr_response_status ⇒ Object 



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# File 'lib/isomorfeus/preact_view_helper.rb', line 86

def ssr_response_status
  @ssr_response_status || 200
end

#ssr_styles ⇒ Object 



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# File 'lib/isomorfeus/preact_view_helper.rb', line 90

def ssr_styles
  @ssr_styles || ''
end