granicus.if.org Git - icinga2/blob - lib/icinga/checkable-flapping.cpp

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2017 Icinga Development Team (https://www.icinga.com/)  *
   4  *                                                                            *
   5  * This program is free software; you can redistribute it and/or              *
   6  * modify it under the terms of the GNU General Public License                *
   7  * as published by the Free Software Foundation; either version 2             *
   8  * of the License, or (at your option) any later version.                     *
   9  *                                                                            *
  10  * This program is distributed in the hope that it will be useful,            *
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
  13  * GNU General Public License for more details.                               *
  14  *                                                                            *
  15  * You should have received a copy of the GNU General Public License          *
  16  * along with this program; if not, write to the Free Software Foundation     *
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
  18  ******************************************************************************/
  19
  20 #include <bitset>
  21 #include "icinga/checkable.hpp"
  22 #include "icinga/icingaapplication.hpp"
  23 #include "base/utility.hpp"
  24
  25 using namespace icinga;
  26
  27 void Checkable::UpdateFlappingStatus(bool stateChange)
  28 {
  29 /* TODO: Add support for Windows satellites/masters. */
  30 #ifndef _WIN32 /* _WIN32 */
  31         std::bitset<20> stateChangeBuf = GetFlappingBuffer();
  32         int oldestIndex = GetFlappingIndex();
  33
  34         stateChangeBuf[oldestIndex] = stateChange;
  35         oldestIndex = (oldestIndex + 1) % 20;
  36
  37         double stateChanges = 0;
  38
  39         /* Iterate over our state array and compute a weighted total */
  40         for (int i = 0; i < 20; i++) {
  41                 if (stateChangeBuf[(oldestIndex + i) % 20])
  42                         stateChanges += 0.8 + (0.02 * i);
  43         }
  44
  45         double flappingValue = 100.0 * stateChanges / 20.0;
  46
  47         bool flapping;
  48
  49         if (GetFlapping())
  50                 flapping = flappingValue > GetFlappingThresholdLow();
  51         else
  52                 flapping = flappingValue > GetFlappingThresholdHigh();
  53
  54         SetFlappingBuffer(stateChangeBuf.to_ulong());
  55         SetFlappingIndex(oldestIndex);
  56         SetFlappingCurrent(flappingValue);
  57         SetFlapping(flapping, true);
  58
  59         if (flapping != GetFlapping())
  60                 SetFlappingLastChange(Utility::GetTime());
  61
  62 #endif /* _WIN32 */
  63 }
  64
  65 bool Checkable::IsFlapping(void) const
  66 {
  67         if (!GetEnableFlapping() || !IcingaApplication::GetInstance()->GetEnableFlapping())
  68                 return false;
  69         else
  70                 return GetFlapping();
  71 }