recipe_renderer_and_trigger.py

   1 #!/usr/bin/env python3
   2
   3 import logging
   4 import os
   5 from typing import Dict, Optional, List, Tuple
   6
   7 from pyutils.files import file_utils
   8
   9 import kiosk_constants as constants
  10 import file_writer
  11 import globals
  12 import renderer
  13 import trigger
  14
  15
  16 logger = logging.getLogger(__name__)
  17
  18 RECIPE_PAGE = "recipe-unwrapped_1_82400.html"
  19 RECIPE_PATH = os.path.join(constants.pages_dir, RECIPE_PAGE)
  20
  21
  22 class RecipeTrigger(trigger.trigger):
  23     def get_triggered_page_list(self) -> Optional[List[Tuple[str, int]]]:
  24         if globals.get("recipe_page_triggered"):
  25             logger.debug("Recipe page is triggered!")
  26             return [(RECIPE_PAGE, trigger.trigger.PRIORITY_HIGH)]
  27         return None
  28
  29
  30 class RecipeRenderer(renderer.abstaining_renderer):
  31     def __init__(
  32         self,
  33         url_location: str,
  34         name_to_timeout_dict: Dict[str, int],
  35     ) -> None:
  36         super().__init__(name_to_timeout_dict)
  37         self.url_location = url_location
  38
  39     def periodic_render(self, key: str) -> bool:
  40         triggered = False
  41         if file_utils.does_path_exist(self.url_location):
  42             with open(self.url_location, "r") as rf:
  43                 url = rf.read()
  44             url.strip()
  45             logger.debug(f"Read {url} from {self.url_location}, writing the page")
  46
  47             if url and len(url) > 0:
  48                 with file_writer.file_writer(RECIPE_PATH) as f:
  49                     f.write(
  50                         """
  51 <!DOCTYPE html>
  52 <html>
  53   <head>
  54     <title>Current Recipe</title>
  55     <style>
  56       #recipe {
  57           height: 100%;
  58       }
  59       html,
  60       body {
  61           height: 100%;
  62           margin: 0;
  63           padding: 0;
  64       }
  65     </style>
  66     <script>
  67       const sleep = (milliseconds) => {
  68           return new Promise(resolve => setTimeout(resolve, milliseconds))
  69       }
  70
  71       function iframeRef( frameRef ) {
  72         return frameRef.contentWindow
  73           ? frameRef.contentWindow.document
  74           : frameRef.contentDocument
  75       }
  76
  77       function countdown() {
  78           setTimeout(
  79               function() {
  80                   var now = new Date();
  81                   var deltaMs = now.getTime() - loadedDate.getTime();
  82                   var totalMs = 120000;
  83                   var remainingMs = (totalMs - deltaMs);
  84
  85                   if (remainingMs <= 0) {
  86                       // Reload unconditionally every two minutes.
  87                       window.location.reload(true);
  88                   }
  89
  90                   // Get rid of the recipe title bar, it's too big.
  91                   var recipe = iframeRef(document.getElementById('embedded'))
  92                   recipe.getElementById('id_main_nav').style.visibility = 'hidden';
  93
  94                   // Brief sleep before doing it all over again.
  95                   sleep(1000).then(() => {
  96                       countdown();
  97                   });
  98               }, 1000)
  99       }
 100     </script>
 101   </head>
 102                        """
 103                     )
 104                     f.write(
 105                         f"""
 106   <body onload='javascript:loadedDate = new Date(); countdown();'>
 107     <span>
 108       <div id="recipe">
 109         <IFRAME ID='embedded' WIDTH=100% HEIGHT=100% SRC="{url}"></IFRAME>
 110       </div>
 111     </span>
 112   </body>
 113 </html>
 114                        """
 115                     )
 116                     triggered = True
 117
 118         if not triggered:
 119             logger.debug("We are no longer triggered.")
 120             if file_utils.does_path_exist(RECIPE_PATH):
 121                 file_utils.remove(RECIPE_PATH)
 122         else:
 123             logger.debug("We are triggered.")
 124         globals.put("recipe_page_triggered", triggered)
 125         return True