#!rsc by RouterOS
# RouterOS script: check-health
# Copyright (c) 2019-2020 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# check for RouterOS health state
# https://git.eworm.de/cgit/routeros-scripts/about/doc/check-health.md

:global CheckHealthLast;
:global CheckHealthTemperature;
:global CheckHealthTemperatureDeviation;
:global CheckHealthTemperatureNotified;
:global CheckHealthVoltagePercent;
:global Identity;

:global LogPrintExit;
:global SendNotification;
:global SymbolForNotification;

:local FormatVoltage do={
  :local Voltage [ :tonum $1 ];
  :return (($Voltage / 10) . "." . ($Voltage % ($Voltage / 10 * 10)) . "V");
}

:local CheckHealthCurrent [ / system health get ];

:if ([ :len $CheckHealthCurrent ] = 0) do={
  $LogPrintExit error ("Your device does not provide any health values.") true;
}

:if ([ :typeof $CheckHealthTemperatureNotified ] != "array") do={
  :set CheckHealthTemperatureNotified [ :toarray "" ];
}

:foreach Name,Voltage in=$CheckHealthCurrent do={
  :if ($Name ~ "(battery|voltage)" && \
       [ :typeof ($CheckHealthLast->$Name) ] = "num" && \
       [ :typeof $Voltage ] = "num") do={
    :if ($CheckHealthLast->$Name * (100 + $CheckHealthVoltagePercent) < $Voltage * 100 || \
         $CheckHealthLast->$Name * 100 > $Voltage * (100 + $CheckHealthVoltagePercent)) do={
      $SendNotification ([ $SymbolForNotification "high-voltage-sign" ] . "Health warning: " . $Name) \
          ("The " . $Name . " on " . $Identity . " jumped more than " . $CheckHealthVoltagePercent . "%.\n\n" . \
          "old value: " . [ $FormatVoltage ($CheckHealthLast->$Name) ] . "\n" . \
          "new value: " . [ $FormatVoltage $Voltage ]);
    }
  }
}

:foreach Name,PSU in=$CheckHealthCurrent do={
  :if ($Name ~ "psu.*-state" && \
       [ :typeof ($CheckHealthLast->$Name) ] = "str" && \
       [ :typeof $PSU ] = "str") do={
    :if ($CheckHealthLast->$Name = "ok" && \
         $PSU != "ok") do={
      $SendNotification ([ $SymbolForNotification "cross-mark" ] . "Health warning: " . $Name) \
          ("The power supply unit '" . $Name . "' on " . $Identity . " failed!");
    }
    :if ($CheckHealthLast->$Name != "ok" && \
         $PSU = "ok") do={
      $SendNotification ([ $SymbolForNotification "white-heavy-check-mark" ] . "Health recovery: " . $Name) \
          ("The power supply unit '" . $Name . "' on " . $Identity . " recovered!");
    }
  }
}

:foreach Name,Temperature in=$CheckHealthCurrent do={
  :if ($Name ~ "temperature" && \
       [ :typeof $Temperature ] = "num") do={
    :if ([ :typeof ($CheckHealthTemperature->$Name) ] != "num" ) do={
      $LogPrintExit info ("No threshold given for " . $Name . ", assuming 50C.") false;
      :set ($CheckHealthTemperature->$Name) 50;
    }
    :if ($Temperature > $CheckHealthTemperature->$Name && \
         $CheckHealthTemperatureNotified->$Name != true) do={
      $SendNotification ([ $SymbolForNotification "fire" ] . "Health warning: " . $Name) \
          ("The " . $Name . " on " . $Identity . " is above threshold: " . \
          $Temperature . "\C2\B0" . "C");
      :set ($CheckHealthTemperatureNotified->$Name) true;
    }
    :if ($Temperature <= ($CheckHealthTemperature->$Name - $CheckHealthTemperatureDeviation) && \
         $CheckHealthTemperatureNotified->$Name = true) do={
      $SendNotification ([ $SymbolForNotification "white-heavy-check-mark" ] . "Health recovery: " . $Name) \
          ("The " . $Name . " on " . $Identity . " dropped below threshold: " .  \
          $Temperature . "\C2\B0" . "C");
      :set ($CheckHealthTemperatureNotified->$Name) false;
    }
  }
}

:set CheckHealthLast $CheckHealthCurrent;