Module: Isomorfeus::ReactViewHelper

Defined in:
lib/isomorfeus/react_view_helper.rb

Instance Method Summary collapse

Instance Method Details

#mount_component(component_name, props = {}, asset = 'application_ssr.js') ⇒ Object 



3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
 
# File 'lib/isomorfeus/react_view_helper.rb', line 3

def mount_component(component_name, props = {}, asset = 'application_ssr.js')
  @ssr_response_status = nil
  @ssr_styles = nil
  thread_id_asset = "#{Thread.current.object_id}#{asset}"
  render_result = "<div data-iso-env=\"#{Isomorfeus.env}\" data-iso-root=\"#{component_name}\" data-iso-props='#{Oj.dump(props, mode: :strict)}'"
  if Isomorfeus.server_side_rendering

    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
      asset_path = "#{Isomorfeus.ssr_hot_asset_url}#{asset}"
      begin
        asset = Net::HTTP.get(URI(asset_path))
        Isomorfeus.ssr_contexts[thread_id_asset] = ExecJS.permissive_compile(asset)
      rescue
        STDERR.puts "SSR: Failed loading assets from webpack dev server."
      end
    else
      # initialize speednode context
      unless Isomorfeus.ssr_contexts.key?(thread_id_asset)
        asset_file_name = OpalWebpackLoader::Manifest.lookup_path_for(asset)
        asset_path = File.join('public', asset_file_name)
        Isomorfeus.ssr_contexts[thread_id_asset] = ExecJS.permissive_compile(File.read(asset_path))
      end
    end

    # build javascript for rendering first pass
    # it will initialize buffers to guard against leaks, maybe caused by previous exceptions
    javascript = <<~JAVASCRIPT
      global.Opal.React.render_buffer = [];
      global.Opal.React.active_components = [];
      global.Opal.React.active_redux_components = [];
      global.FirstPassFinished = false;
      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]}');
    JAVASCRIPT

    # if location_host and scheme are given and if Transport is loaded, connect and then render, otherwise do not 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
    javascript << <<~JAVASCRIPT
      var api_ws_path = '#{api_ws_path}';
      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', [], ($$1 = function(){
          try {
            global.Opal.Isomorfeus.TopLevel.$render_component_to_string('#{component_name}', #{Oj.dump(props, mode: :strict)});
            global.FirstPassFinished = 'transport';
          } catch (e) { global.FirstPassFinished = 'transport'; }
        }, $$1.$$s = this, $$1.$$arity = 0, $$1))
      } else { return global.FirstPassFinished = true; };
    JAVASCRIPT

    # execute first render pass
    first_pass_skipped = Isomorfeus.ssr_contexts[thread_id_asset].exec(javascript)

    # wait for first pass to finish
    unless first_pass_skipped
      first_pass_finished = Isomorfeus.ssr_contexts[thread_id_asset].exec('return global.FirstPassFinished')
      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.React.render_buffer = [];
      global.Opal.React.active_components = [];
      global.Opal.React.active_redux_components = [];
      let rendered_tree;
      let ssr_styles;
      let component;
      if (typeof global.Opal.global.MuiStyles !== 'undefined' && typeof global.Opal.global.MuiStyles.ServerStyleSheets !== 'undefined') {
        component = '#{component_name}'.split(".").reduce(function(o, x) {
          return (o !== null && typeof o[x] !== "undefined" && o[x] !== null) ? o[x] : null;
        }, global.Opal.global)
        if (!component) { component = global.Opal.Isomorfeus.$cached_component_class('#{component_name}'); }
        try {
          let sheets = new global.Opal.global.MuiStyles.ServerStyleSheets();
          let app = global.Opal.React.$create_element(component, global.Opal.Hash.$new(#{Oj.dump(props, mode: :strict)}));
          rendered_tree = global.Opal.global.ReactDOMServer.renderToString(sheets.collect(app));
          ssr_styles = sheets.toString();
        } catch (e) {
          rendered_tree = e.message + "\\n" + e.stack;
        }
      } else if (typeof global.Opal.global.ReactJSS !== 'undefined' && typeof global.Opal.global.ReactJSS.SheetsRegistry !== 'undefined') {
        component = '#{component_name}'.split(".").reduce(function(o, x) {
          return (o !== null && typeof o[x] !== "undefined" && o[x] !== null) ? o[x] : null;
        }, global.Opal.global)
        if (!component) { component = global.Opal.Isomorfeus.$cached_component_class('#{component_name}'); }
        try {
          let sheets = new global.Opal.global.ReactJSS.SheetsRegistry();
          let generate_id = global.Opal.global.ReactJSS.createGenerateId();
          let app = global.Opal.React.$create_element(component, global.Opal.Hash.$new(#{Oj.dump(props, mode: :strict)}));
          let element = global.Opal.global.React.createElement(global.Opal.global.ReactJSS.JssProvider, { registry: sheets, generateId: generate_id }, app);
          rendered_tree = global.Opal.global.ReactDOMServer.renderToString(element);
          ssr_styles = sheets.toString();
        } catch (e) {
          rendered_tree = e.message + "\\n" + e.stack;
        }
      } else {
        try {
          rendered_tree = global.Opal.Isomorfeus.TopLevel.$render_component_to_string('#{component_name}', #{Oj.dump(props, mode: :strict)});
        } catch (e) {
          rendered_tree = e.message + "\\n" + e.stack;
        }
      }
      let application_state = global.Opal.Isomorfeus.store.native.getState();
      if (typeof global.Opal.Isomorfeus.Transport !== 'undefined') { global.Opal.Isomorfeus.Transport.$disconnect(); }
      return [rendered_tree, application_state, ssr_styles, global.Opal.Isomorfeus['$ssr_response_status']()];
    JAVASCRIPT

    # execute second render pass
    rendered_tree, application_state, @ssr_styles, @ssr_response_status = Isomorfeus.ssr_contexts[thread_id_asset].exec(javascript)

    # build result
    render_result << " data-iso-hydrated='true'" if rendered_tree
    render_result << " data-iso-nloc='#{props[:locale]}' data-iso-state='#{Oj.dump(application_state, mode: :strict)}'>"
    render_result << (rendered_tree ? rendered_tree : "SSR didn't work")
  else
    render_result << " data-iso-nloc='#{props[:locale]}'>"
  end
  render_result << '</div>'
  render_result
end

#ssr_response_status ⇒ Object 



160
161
162
 
# File 'lib/isomorfeus/react_view_helper.rb', line 160

def ssr_response_status
  @ssr_response_status || 200
end

#ssr_styles ⇒ Object 



164
165
166
 
# File 'lib/isomorfeus/react_view_helper.rb', line 164

def ssr_styles
  @ssr_styles || ''
end