!7

static Map<O, Long> wsToState = weakHashMap();
static int interval = 200, initialChars = 65536;
//static long timeout = 10*60000L; // larger timeout since we have no idle mechanism yet (todo)
static long timeout = 30000+10000; // idle time + latency

static File fileToLog() { ret mechVersionsLog(); }

p {
  webSocketManager = new WebSocketManager {
    void onNewWebSocket(O ws, S uri) {
      super.onNewWebSocket(ws, uri);
      set(ws, 'timeout, timeout);
    }
    
    void onWebSocketMessage(O ws, S s) {
      File f = fileToLog();
      long len = fileSize(f);
      new Matches m;
      if "look back * chars pw *" // TODO: filter if it appears in Eleu log
        if (neq(masterPW(), $2)) {
          call(ws, 'send, "bad pw");
          call(ws, 'close);
        } else
          wsToState.put(ws, max(0, len-parseLong($1)));
    }
  };
  doEvery(interval, f update);
}

html { ret "Use WebSocket: " + subBot_myWebSocketURI(); }

svoid update {
  if (webSocketManager.isEmpty()) ret;
  File f = fileToLog();
  long len = fileSize(f);
  
  for (O ws : webSocketManager.webSockets()) {
    Long l = wsToState.get(ws);
    if (l != null && len > l) { // no cmd yet? ignore
      S newStuff = unquoteAllLines(loadTextFilePart(f, l, len));
      wsToState.put(ws, len);
      call(ws, 'send, "+" + newStuff);
    }
  }
}

Began life as a copy of #1014682