kiosk.py

   1 #!/usr/bin/env python3
   2
   3 import collections
   4 from datetime import datetime
   5 from difflib import SequenceMatcher
   6 import gc
   7 import logging
   8 import os
   9 import re
  10 from threading import Thread
  11 import time
  12 import tracemalloc
  13 from typing import Dict, List, Optional
  14 from queue import Queue
  15
  16 import astral  # type: ignore
  17 from astral.sun import sun  # type: ignore
  18 import numpy as np
  19 import pvporcupine
  20 import pytz
  21
  22 import bootstrap
  23 import config
  24 import datetime_utils
  25
  26 import constants
  27 import file_writer
  28 import renderer_catalog
  29 import chooser
  30 import listen
  31 import trigger_catalog
  32 import utils
  33
  34
  35 cfg = config.add_commandline_args(
  36     f'Kiosk Server ({__file__})',
  37     'A python server that runs a kiosk.'
  38 )
  39 logger = logging.getLogger(__file__)
  40
  41
  42 def thread_janitor() -> None:
  43     tracemalloc.start()
  44     tracemalloc_target = 0.0
  45     gc_target = 0.0
  46     gc.enable()
  47
  48     # Main janitor loop; dump the largest pigs and force regular gcs.
  49     while True:
  50         now = time.time()
  51         if now > tracemalloc_target:
  52             tracemalloc_target = now + 30.0
  53             snapshot = tracemalloc.take_snapshot()
  54             snapshot = snapshot.filter_traces((
  55                 tracemalloc.Filter(False, "<frozen importlib._bootstrap>"),
  56                 tracemalloc.Filter(False, "<unknown>"),
  57             ))
  58             key_type = 'lineno'
  59             limit = 10
  60             top_stats = snapshot.statistics(key_type)
  61             logger.info(f'janitor: Top {limit} lines')
  62             for index, stat in enumerate(top_stats[:limit], 1):
  63                 frame = stat.traceback[0]
  64
  65                 # replace "/path/to/module/file.py" with "module/file.py"
  66                 filename = os.sep.join(frame.filename.split(os.sep)[-2:])
  67                 logger.info(
  68                     f'janitor: #{index}: {filename}:{frame.lineno}: {stat.size / 1024:.1f} KiB'
  69                 )
  70
  71             other = top_stats[limit:]
  72             if other:
  73                 size = sum(stat.size for stat in other)
  74                 logger.info(
  75                     f'janitor: {len(other)} others: {size/1024:.1f} KiB'
  76                 )
  77             total = sum(stat.size for stat in top_stats)
  78             logger.info(
  79                 f'janitor: Total allocated size: {total / 1024:.1f} KiB'
  80             )
  81         if now > gc_target:
  82             logger.info('janitor: kicking off a manual gc operation now.')
  83             gc.collect()
  84             gc_target = now + 120.0
  85         time.sleep(30.0)
  86
  87
  88 def guess_page(command: str, page_chooser: chooser.chooser) -> str:
  89
  90     def normalize_page(page: str) -> str:
  91         logger.debug(f'normalize_page input: {page}')
  92         page = page.replace('(', ' ')
  93         page = page.replace('_', ' ')
  94         page = page.replace(')', ' ')
  95         page = page.replace('.html', '')
  96         page = page.replace('CNNNews', 'news')
  97         page = page.replace('CNNTechnology', 'technology')
  98         page = page.replace('gocostco', 'costco list')
  99         page = page.replace('gohardware', 'hardware list')
 100         page = page.replace('gohouse', 'house list honey do')
 101         page = page.replace('gcal', 'google calendar events')
 102         page = page.replace('mynorthwest', 'northwest news')
 103         page = page.replace('myq', 'myq garage door status')
 104         page = page.replace('gomenu', 'dinner menu')
 105         page = page.replace('gmaps-seattle-unwrapped', 'traffic')
 106         page = page.replace('gomenu', 'dinner menu')
 107         page = page.replace('WSJNews', 'news')
 108         page = page.replace('telma', 'telma cabin')
 109         page = page.replace('WSJBusiness', 'business news')
 110         page = re.sub(r'[0-9]+', '', page)
 111         logger.debug(f'normalize_page output: {page}')
 112         return page
 113
 114     logger.info(f'No exact match for f{command}; trying to guess...')
 115     best_page = None
 116     best_score = None
 117     for page in page_chooser.get_page_list():
 118         npage = normalize_page(page)
 119         score = SequenceMatcher(None, command, npage).ratio()
 120         if best_score is None or score > best_score:
 121             best_page = page
 122             best_score = score
 123     assert best_page is not None
 124     logger.info(f'Best guess for f{command} => {best_page} (score = {best_score})')
 125     return best_page
 126
 127
 128 def process_command(command: str, page_history: List[str], page_chooser) -> str:
 129     command = command.lower()
 130     logger.info(f'Parsing verbal command: {command}')
 131     page = None
 132     if 'hold' in command:
 133         page = page_history[0]
 134     elif 'back' in command:
 135         page = page_history[1]
 136     elif 'skip' in command:
 137         while True:
 138             (page, _) = page_chooser.choose_next_page()
 139             if page == page_history[0]:
 140                 logger.debug(f'chooser: {page} is the same as last time!  Try again.')
 141             else:
 142                 break
 143     elif 'internal' in command:
 144         if 'render' in command:
 145             page = constants.render_stats_pagename
 146         else:
 147             page = constants.render_stats_pagename
 148     elif 'weather' in command:
 149         if 'telma' in command or 'cabin' in command:
 150             page = 'weather-telma_3_10800.html'
 151         elif 'stevens' in command:
 152             page = 'weather-stevens_3_10800.html'
 153         else:
 154             page = 'weather-home_3_10800.html'
 155     elif 'cabin' in command:
 156         if 'list' in command:
 157             page = 'Cabin-(gocabin)_2_3600.html'
 158         else:
 159             page = 'hidden/cabin_driveway.html'
 160     elif 'news' in command or 'headlines' in command:
 161         page = 'cnn-CNNNews_4_25900.html'
 162     elif 'clock' in command or 'time' in command:
 163         page = 'clock_10_none.html'
 164     elif 'countdown' in command or 'countdowns' in command:
 165         page = 'countdown_3_7200.html'
 166     elif 'costco' in command:
 167         page = 'Costco-(gocostco)_2_3600.html'
 168     elif 'calendar' in command or 'events' in command:
 169         page = 'gcal_3_86400.html'
 170     elif 'countdown' in command or 'countdowns' in command:
 171         page = 'countdown_3_7200.html'
 172     elif 'grocery' in command or 'groceries' in command:
 173         page = 'Grocery-(gogrocery)_2_3600.html'
 174     elif 'hardware' in command:
 175         page = 'Hardware-(gohardware)_2_3600.html'
 176     elif 'garage' in command:
 177         page = 'myq_4_300.html'
 178     elif 'menu' in command:
 179         page = 'Menu-(gomenu)_2_3600.html'
 180     elif 'cron' in command or 'health' in command:
 181         page = 'periodic-health_6_300.html'
 182     elif 'photo' in command or 'picture' in command:
 183         page = 'photo_23_3600.html'
 184     elif 'quote' in command or 'quotation' in command or 'quotes' in command:
 185         page = 'quotes_4_10800.html'
 186     elif 'stevens' in command:
 187         page = 'stevens-conditions_1_86400.html'
 188     elif 'stock' in command or 'stocks' in command:
 189         page = 'stock_3_86400.html'
 190     elif 'twitter' in command:
 191         page = 'twitter_10_3600.html'
 192     elif 'traffic' in command:
 193         page = 'gmaps-seattle-unwrapped_5_none.html'
 194     elif 'front' in command and 'door' in command:
 195         page = 'hidden/frontdoor.html'
 196     elif 'driveway' in command:
 197         page = 'hidden/driveway.html'
 198     elif 'backyard' in command:
 199         page = 'hidden/backyard.html'
 200     else:
 201         page = guess_page(command, page_chooser)
 202     assert page is not None
 203     logger.info(f'Parsed to {page}')
 204     return page
 205
 206
 207 def thread_change_current(command_queue: Queue) -> None:
 208     page_history = ["", ""]
 209     swap_page_target = 0.0
 210
 211     def filter_news_during_dinnertime(page: str) -> bool:
 212         now = datetime.now(tz=pytz.timezone("US/Pacific"))
 213         is_dinnertime = now.hour >= 18 and now.hour <= 20
 214         return not is_dinnertime or not (
 215             "cnn" in page
 216             or "news" in page
 217             or "mynorthwest" in page
 218             or "seattle" in page
 219             or "wsj" in page
 220         )
 221
 222     page_chooser = chooser.weighted_random_chooser_with_triggers(
 223         trigger_catalog.get_triggers(), [filter_news_during_dinnertime]
 224     )
 225     current_file = os.path.join(constants.pages_dir, "current.shtml")
 226     emergency_file = os.path.join(constants.pages_dir, "reload_immediately.html")
 227
 228     # Main chooser loop
 229     while True:
 230         now = time.time()
 231
 232         # Check for a verbal command.
 233         command = None
 234         try:
 235             command = command_queue.get(block=False)
 236         except Exception:
 237             command = None
 238
 239         if command is not None:
 240             logger.info(f'chooser: We got a verbal command ("{command}"), parsing it...')
 241             triggered = True
 242             page = process_command(command, page_history, page_chooser)
 243         else:
 244             while True:
 245                 (page, triggered) = page_chooser.choose_next_page()
 246                 if triggered:
 247                     logger.info('chooser: A trigger is active...')
 248                     break
 249                 else:
 250                     if page == page_history[0]:
 251                         logger.debug(f'chooser: {page} is the same as last time! Try again.')
 252                     else:
 253                         break
 254
 255         if triggered:
 256             if page != page_history[0] or (swap_page_target - now) < 10.0:
 257                 logger.info(f'chooser: An emergency page reload to {page} is needed at this time.')
 258                 swap_page_target = now + constants.emergency_refresh_period_sec
 259
 260                 # Set current.shtml to the right page.
 261                 try:
 262                     with open(current_file, "w") as f:
 263                         emit(
 264                             f,
 265                             page,
 266                             override_refresh_sec = constants.emergency_refresh_period_sec,
 267                             command = command
 268                         )
 269                     logger.debug(f'chooser: Wrote {current_file}.')
 270                 except Exception as e:
 271                     logger.exception(e)
 272                     logger.error(f'chooser: Unexpected exception; assuming {page} doesn\'t exist?!')
 273                     continue
 274
 275                 # Also notify XMLHTTP clients that they need to refresh now.
 276                 with open(emergency_file, "w") as f:
 277                     f.write(f'Reload, suckers... you HAVE to see {page}!')
 278                 logger.debug(f'chooser: Wrote {emergency_file}...')
 279
 280                 # Fix this hack... maybe read the webserver logs and see if it
 281                 # actually was picked up?
 282                 time.sleep(0.999)
 283                 os.remove(emergency_file)
 284                 logger.debug(f'chooser: ...and removed {emergency_file}.')
 285
 286         elif now >= swap_page_target:
 287             assert page != page_history[0]
 288             logger.info(
 289                 f'chooser: Nominal choice of {page} as the next to show.'
 290             )
 291             swap_page_target = now + constants.refresh_period_sec
 292             try:
 293                 with open(current_file, "w") as f:
 294                     emit(f, page)
 295                 logger.debug(f'chooser: Wrote {current_file}.')
 296             except Exception as e:
 297                 logger.exception(e)
 298                 logger.error(f'chooser: Unexpected exception; assuming {page} doesn\'t exist?!')
 299                 continue
 300         page_history.insert(0, page)
 301         page_history = page_history[0:10]
 302         time.sleep(0.5)
 303
 304
 305 def emit(f,
 306          filename: str,
 307          *,
 308          override_refresh_sec: int = None,
 309          command: str = None):
 310     if 'unwrapped' not in filename:
 311         logger.debug(f'Emitting {filename} wrapped.')
 312         emit_wrapped(f, filename, override_refresh_sec=override_refresh_sec, command=command)
 313     else:
 314         logger.debug(f'Emitting {filename} raw.')
 315         emit_raw(f, filename)
 316
 317
 318 def emit_raw(f, filename: str):
 319     f.write(f'<!--#include virtual="{filename}"-->')
 320
 321
 322 def emit_wrapped(f,
 323                  filename: str,
 324                  *,
 325                  override_refresh_sec: int = None,
 326                  command: str = None) -> None:
 327
 328     def pick_background_color() -> str:
 329         now = datetime_utils.now_pacific()
 330         city = astral.LocationInfo(
 331             "Bellevue", "USA", "US/Pacific", 47.610, -122.201
 332         )
 333         s = sun(city.observer, date=now, tzinfo=pytz.timezone("US/Pacific"))
 334         sunrise_mod = utils.minute_number(s["sunrise"].hour, s["sunrise"].minute)
 335         sunset_mod = utils.minute_number(s["sunset"].hour, s["sunset"].minute)
 336         now_mod = utils.minute_number(now.hour, now.minute)
 337         if now_mod < sunrise_mod or now_mod > (sunset_mod + 45):
 338             return "E6B8B8"
 339         elif now_mod < (sunrise_mod + 45) or now_mod > (sunset_mod + 120):
 340             return "EECDCD"
 341         else:
 342             return "FFFFFF"
 343
 344     def get_refresh_period() -> float:
 345         if override_refresh_sec is not None:
 346             return float(override_refresh_sec * 1000.0)
 347         now = datetime.now(tz=pytz.timezone("US/Pacific"))
 348         if now.hour < 6:
 349             return float(constants.refresh_period_night_sec * 1000.0)
 350         else:
 351             return float(constants.refresh_period_sec * 1000.0)
 352
 353     age = utils.describe_age_of_file_briefly(f"pages/{filename}")
 354     bgcolor = pick_background_color()
 355     if command is None:
 356         pageid = filename
 357     else:
 358         pageid = f'"{command}" -> {filename}'
 359
 360     f.write(
 361 """
 362 <HEAD>
 363   <TITLE>Kitchen Kiosk</TITLE>
 364   <LINK rel="stylesheet" type="text/css" href="style.css">
 365   <SCRIPT TYPE="text/javascript">
 366
 367   // Zoom the 'contents' div to fit without scrollbars and then make
 368   // it visible.
 369   function zoomScreen() {
 370     z = 285;
 371     do {
 372       document.getElementById("content").style.zoom = z+"%";
 373       var body = document.body;
 374       var html = document.documentElement;
 375       var height = Math.max(body.scrollHeight,
 376                             body.offsetHeight,
 377                             html.clientHeight,
 378                             html.scrollHeight,
 379                             html.offsetHeight);
 380       var windowHeight = window.innerHeight;
 381       var width = Math.max(body.scrollWidth,
 382                            body.offsetWidth,
 383                            html.clientWidth,
 384                            html.scrollWidth,
 385                            html.offsetWidth);
 386       var windowWidth = window.innerWidth;
 387       var heightRatio = height / windowHeight;
 388       var widthRatio = width / windowWidth;
 389
 390       if (heightRatio <= 1.0 && widthRatio <= 1.0) {
 391         break;
 392       }
 393       z -= 4;
 394     } while(z >= 70);
 395     document.getElementById("content").style.visibility = "visible";
 396   }
 397
 398   // Load IMG tags with DATA-SRC attributes late.
 399   function lateLoadImages() {
 400     var image = document.getElementsByTagName('img');
 401     for (var i = 0; i < image.length; i++) {
 402       if (image[i].getAttribute('DATA-SRC')) {
 403         image[i].setAttribute('SRC', image[i].getAttribute('DATA-SRC'));
 404       }
 405     }
 406   }
 407 """
 408     )
 409     f.write(
 410 """
 411   // Operate the clock at the top of the page.
 412   function runClock() {
 413     var today = new Date();
 414     var h = today.getHours();
 415     var ampm = h >= 12 ? 'pm' : 'am';
 416     h = h %% 12;
 417     h = h ? h : 12; // the hour '0' should be '12'
 418     var m = maybeAddZero(today.getMinutes());
 419     var colon = ":";
 420     if (today.getSeconds() %% 2 == 0) {
 421       colon = "<FONT STYLE='color: #%s; font-size: 4vmin; font-weight: bold'>:</FONT>";
 422     }
 423     document.getElementById("time").innerHTML = h + colon + m + ampm;
 424     document.getElementById("date").innerHTML = today.toDateString();
 425     var t = setTimeout(function(){runClock()}, 1000);
 426   }
 427 """ % bgcolor
 428     )
 429     f.write(
 430 """
 431   // Helper method for running the clock.
 432   function maybeAddZero(x) {
 433     return (x < 10) ? "0" + x : x;
 434   }
 435
 436   // Do something on page load.
 437   function addLoadEvent(func) {
 438     var oldonload = window.onload;
 439     if (typeof window.onload != 'function') {
 440       window.onload = func;
 441     } else {
 442       window.onload = function() {
 443         if (oldonload) {
 444           oldonload();
 445         }
 446         func();
 447       }
 448     }
 449   }
 450
 451   // Sleep thread helper.
 452   const sleep = (milliseconds) => {
 453     return new Promise(resolve => setTimeout(resolve, milliseconds))
 454   }
 455
 456   var loadedDate = new Date();
 457
 458   addLoadEvent(zoomScreen);
 459   addLoadEvent(runClock);
 460   addLoadEvent(lateLoadImages);
 461 """
 462     )
 463     f.write(
 464 """
 465   // Runs the countdown line at the bottom and is responsible for
 466   // normal page reloads caused by the expiration of a timer.
 467   (function countdown() {
 468     setTimeout(
 469       function() {
 470         var now = new Date();
 471         var deltaMs = now.getTime() - loadedDate.getTime();
 472         var totalMs = %d;
 473         var remainingMs = (totalMs - deltaMs);
 474
 475         if (remainingMs > 0) {
 476           var hr = document.getElementById("countdown");
 477           var width = (remainingMs / (totalMs - 5000)) * 100.0;
 478           if (width <= 100) {
 479             hr.style.visibility = "visible";
 480             hr.style.width = " ".concat(width, "%%");
 481             hr.style.backgroundColor = "maroon";
 482           }
 483         } else {
 484           // Reload unconditionally after 22 sec.
 485           window.location.reload(true);
 486         }
 487
 488         // Brief sleep before doing it all over again.
 489         sleep(50).then(() => {
 490           countdown();
 491         });
 492       }, 50)
 493   })();
 494 """ % get_refresh_period()
 495     )
 496     f.write(
 497 """
 498   function check_reload() {
 499     var xhr = new XMLHttpRequest();
 500     xhr.open('GET',
 501              '%s/reload_immediately.html');
 502     xhr.onload =
 503       function() {
 504         if (xhr.status === 200) {
 505           window.location.reload(true);
 506         }
 507       };
 508     xhr.send();
 509   }
 510
 511   // Periodically checks for emergency reload events.
 512   setInterval(check_reload, 500);
 513   </SCRIPT>
 514 </HEAD>
 515 """ % constants.root_url)
 516     f.write(f'<BODY BGCOLOR="#{bgcolor}">')
 517     f.write(
 518 """
 519     <TABLE style="height:100%; width:100%" BORDER=0>
 520     <TR HEIGHT=30>
 521         <TD ALIGN="left">
 522             <DIV id="date">&nbsp;</DIV>
 523         </TD>
 524         <TD ALIGN="center"><FONT COLOR=#bbbbbb>
 525             <DIV id="info"></DIV></FONT>
 526         </TD>
 527         <TD ALIGN="right">
 528             <DIV id="time">&nbsp;</DIV>
 529         </TD>
 530     </TR>
 531     <TR STYLE="vertical-align:top">
 532         <TD COLSPAN=3>
 533             <DIV ID="content" STYLE="zoom: 1; visibility: hidden;">
 534               <!-- BEGIN main page contents. -->
 535 """
 536     )
 537     f.write(f'<!--#include virtual="{filename}"-->')
 538     f.write(
 539 """
 540             <!-- END main page contents. -->
 541             </DIV>
 542             <BR>
 543             <DIV STYLE="position: absolute; top:1030px; width:99%">
 544             <P ALIGN="right">
 545 """
 546     )
 547     f.write(f'<FONT SIZE=2 COLOR=#bbbbbb>{pageid} @ {age} ago.</FONT>')
 548     f.write(
 549 """
 550             </P>
 551             <HR id="countdown" STYLE="width:0px;
 552                                       text-align:left;
 553                                       margin:0;
 554                                       border:none;
 555                                       border-width:0;
 556                                       height:5px;
 557                                       visibility:hidden;
 558                                       background-color:#ffffff;">
 559             </DIV>
 560         </TD>
 561     </TR>
 562     </TABLE>
 563 </BODY>"""
 564     )
 565
 566
 567 def renderer_update_internal_stats_page(
 568         last_render: Dict[str, datetime],
 569         render_counts: collections.Counter,
 570         render_times: Dict[str, np.array],
 571 ) -> None:
 572     logger.info(
 573         'renderer: Updating internal render statistics page.'
 574     )
 575     with file_writer.file_writer(constants.render_stats_pagename) as f:
 576         f.write(
 577 '''
 578 <CENTER>
 579 <TABLE BORDER=0 WIDTH=95%>
 580     <TR>
 581     <TH><B>Renderer Name</B></TH>
 582     <TH><B>Last Run</B></TH>
 583     <TH><B>Num Invocations</B></TH>
 584     <TH><B>Render Latency</B></TH>
 585     </TR>
 586 ''')
 587         for n, r in enumerate(renderer_catalog.get_renderers()):
 588             if n % 2 == 0:
 589                 style = 'style="margin: 0; padding: 0; background: #c6b0b0;"'
 590             else:
 591                 style = 'style="margin: 0; padding: 0; background: #eeeeee;"'
 592             name = r.get_name()
 593             last = last_render.get(name, None)
 594             if last is None:
 595                 last = 'never'
 596             else:
 597                 last = last.strftime('%Y/%m/%d %I:%M:%S%P')
 598             count = render_counts.get(name, 0)
 599             latency = render_times.get(name, np.array([]))
 600             p25 = p50 = p75 = p90 = p99 = 'N/A'
 601             try:
 602                 p25 = np.percentile(latency, 25)
 603                 p50 = np.percentile(latency, 50)
 604                 p75 = np.percentile(latency, 75)
 605                 p90 = np.percentile(latency, 90)
 606                 p99 = np.percentile(latency, 99)
 607                 f.write(
 608 f'''
 609     <TR>
 610     <TD {style}>{name}&nbsp;</TD>
 611     <TD {style}>&nbsp;{last}&nbsp;</TD>
 612     <TD {style}><CENTER>&nbsp;{count}&nbsp;</CENTER></TD>
 613     <TD {style}>&nbsp;p25={p25:5.2f}, p50={p50:5.2f}, p75={p75:5.2f}, p90={p90:5.2f}, p99={p99:5.2f}</TD>
 614     </TR>
 615 '''
 616                 )
 617             except IndexError:
 618                 pass
 619         f.write('</TABLE>')
 620
 621
 622 def thread_invoke_renderers() -> None:
 623     render_times: Dict[str, np.array] = {}
 624     render_counts: collections.Counter = collections.Counter()
 625     last_render: Dict[str, datetime] = {}
 626
 627     # Touch the internal render page now to signal that we're alive.
 628     renderer_update_internal_stats_page(last_render, render_counts, render_times)
 629
 630     # Main renderer loop
 631     while True:
 632         logger.info(
 633             'renderer: invoking all overdue renderers in catalog...'
 634         )
 635         for r in renderer_catalog.get_renderers():
 636             name = r.get_name()
 637             now = time.time()
 638             logger.info(f'renderer: Invoking {name}\'s render method.')
 639             try:
 640                 r.render()
 641             except Exception as e:
 642                 logger.exception(e)
 643                 logger.error(
 644                     f'renderer: Unexpected and unhandled exception ({e}) in {name}, swallowing it.'
 645                 )
 646                 continue
 647
 648             # Increment the count of render operations per renderer.
 649             render_counts[name] += 1
 650
 651             # Keep track of the last time we invoked each renderer.
 652             last_render[name] = datetime_utils.now_pacific()
 653
 654             # Record how long each render operation takes and warn if very long.
 655             delta = time.time() - now
 656             times = render_times.get(name, np.array([]))
 657             times = np.insert(times, 0, delta)
 658             render_times[name] = times
 659             if delta > 1.0:
 660                 hdr = 'renderer: '
 661                 logger.warning(
 662 f'''
 663 {hdr} Warning: {name}'s rendering took {delta:5.2f}s.
 664 {hdr} FYI: {name}'s render times: p25={np.percentile(times, 25):5.2f}, p50={np.percentile(times, 50):5.2f}, p75={np.percentile(times, 75):5.2f}, p90={np.percentile(times, 90):5.2f}, p99={np.percentile(times, 99):5.2f}
 665 '''
 666                 )
 667
 668         # Update a page about internal stats of renderers.
 669         renderer_update_internal_stats_page(last_render, render_counts, render_times)
 670         logger.info('renderer: having a little nap...')
 671         time.sleep(constants.render_period_sec)
 672
 673
 674 @bootstrap.initialize
 675 def main() -> None:
 676     command_queue: Queue = Queue()
 677     changer_thread: Optional[Thread] = None
 678     renderer_thread: Optional[Thread] = None
 679     janitor_thread: Optional[Thread] = None
 680     hotword_thread: Optional[Thread] = None
 681     while True:
 682         if hotword_thread is None or not hotword_thread.is_alive():
 683             if hotword_thread is None:
 684                 logger.info('watchdog: Starting up the hotword detector thread...')
 685             else:
 686                 logger.warning(
 687                     'watchdog: The hotword detector thread seems to have died; restarting it and hoping for the best.'
 688                 )
 689             keyword_paths = [pvporcupine.KEYWORD_PATHS[x] for x in ["bumblebee"]]
 690             sensitivities = [0.7] * len(keyword_paths)
 691             listener = listen.HotwordListener(
 692                 command_queue,
 693                 keyword_paths,
 694                 sensitivities,
 695             )
 696             hotword_thread = Thread(target=listener.listen_forever, args=())
 697             hotword_thread.start()
 698
 699         if changer_thread is None or not changer_thread.is_alive():
 700             if changer_thread is None:
 701                 logger.info('watchdog: Starting up the current page changer thread...')
 702             else:
 703                 logger.warning(
 704                     'watchdog: The current page changer thread seems to have died; restarting it and hoping for the best.'
 705                 )
 706             changer_thread = Thread(target=thread_change_current, args=(command_queue,))
 707             changer_thread.start()
 708
 709         if renderer_thread is None or not renderer_thread.is_alive():
 710             if renderer_thread is None:
 711                 logger.info('watchdog: Starting up the page renderer thread...')
 712             else:
 713                 logger.warning(
 714                     'watchdog: The page renderer thread seems to have died; restarting it and hoping for the best.'
 715                 )
 716             renderer_thread = Thread(target=thread_invoke_renderers, args=())
 717             renderer_thread.start()
 718
 719         if janitor_thread is None or not janitor_thread.is_alive():
 720             if janitor_thread is None:
 721                 logger.info('watchdog: Starting up the memory janitor thread...')
 722             else:
 723                 logger.warning(
 724                     'watchdog: The memory janitor thread seems to have died; restarting it and hoping for the best.'
 725                 )
 726             janitor_thread = Thread(target=thread_janitor, args=())
 727             janitor_thread.start()
 728
 729         # Have a little break and then check to make sure all threads are still alive.
 730         logger.debug('watchdog: having a little nap.')
 731         time.sleep(constants.check_threads_period_sec)
 732
 733
 734 if __name__ == "__main__":
 735     main()