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

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2018 Icinga Development Team (https://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 "icinga/checkable.hpp"
  21 #include "icinga/icingaapplication.hpp"
  22 #include "base/utility.hpp"
  23
  24 using namespace icinga;
  25
  26 template<typename T>
  27 struct Bitset
  28 {
  29 public:
  30         Bitset(T value)
  31                 : m_Data(value)
  32         { }
  33
  34         void Modify(int index, bool bit)
  35         {
  36                 if (bit)
  37                         m_Data |= 1 << index;
  38                 else
  39                         m_Data &= ~(1 << index);
  40         }
  41
  42         bool Get(int index) const
  43         {
  44                 return m_Data & (1 << index);
  45         }
  46
  47         T GetValue() const
  48         {
  49                 return m_Data;
  50         }
  51
  52 private:
  53         T m_Data{0};
  54 };
  55
  56 void Checkable::UpdateFlappingStatus(bool stateChange)
  57 {
  58         Bitset<unsigned long> stateChangeBuf = GetFlappingBuffer();
  59         int oldestIndex = GetFlappingIndex();
  60
  61         stateChangeBuf.Modify(oldestIndex, stateChange);
  62         oldestIndex = (oldestIndex + 1) % 20;
  63
  64         double stateChanges = 0;
  65
  66         /* Iterate over our state array and compute a weighted total */
  67         for (int i = 0; i < 20; i++) {
  68                 if (stateChangeBuf.Get((oldestIndex + i) % 20))
  69                         stateChanges += 0.8 + (0.02 * i);
  70         }
  71
  72         double flappingValue = 100.0 * stateChanges / 20.0;
  73
  74         bool flapping;
  75
  76         if (GetFlapping())
  77                 flapping = flappingValue > GetFlappingThresholdLow();
  78         else
  79                 flapping = flappingValue > GetFlappingThresholdHigh();
  80
  81         SetFlappingBuffer(stateChangeBuf.GetValue());
  82         SetFlappingIndex(oldestIndex);
  83         SetFlappingCurrent(flappingValue);
  84         SetFlapping(flapping, true);
  85
  86         if (flapping != GetFlapping())
  87                 SetFlappingLastChange(Utility::GetTime());
  88 }
  89
  90 bool Checkable::IsFlapping() const
  91 {
  92         if (!GetEnableFlapping() || !IcingaApplication::GetInstance()->GetEnableFlapping())
  93                 return false;
  94         else
  95                 return GetFlapping();
  96 }