#!rsc by RouterOS
# RouterOS script: netwatch-notify
# Copyright (c) 2020 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# monitor netwatch and send notifications
# https://git.eworm.de/cgit/routeros-scripts/about/doc/netwatch-notify.md

:global NetwatchNotify;

:global IfThenElse;
:global LogPrintExit;
:global ParseKeyValueStore;
:global SendNotification;
:global SymbolForNotification;

:if ([ :typeof $NetwatchNotify ] = "nothing") do={
  :set NetwatchNotify [ :toarray "" ];
}

:foreach Host in=[ / tool netwatch find where comment~"^notify," disabled=no ] do={
  :local HostVal [ / tool netwatch get $Host ];
  :local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
  :local HostName ($HostInfo->"hostname");

  :local Metric { "count"=0; "notified"=false };
  :if ([ :typeof ($NetwatchNotify->$HostName) ] = "array") do={
    :set $Metric ($NetwatchNotify->$HostName);
  }

  :if ($HostVal->"status" = "up") do={
    $LogPrintExit debug ("Host " . $HostName . " (" . $HostVal->"host" . ") is up.") false;
    :local Count ($Metric->"count");
    :set ($Metric->"count") 0;
    :if ($Metric->"notified" = true) do={
      $SendNotification ([ $SymbolForNotification "white-heavy-check-mark" ] . "Netwatch Notify: " . $HostName . " up") \
        ("Host " . $HostName . " (" . $HostVal->"host" . ") is up since " . $HostVal->"since" . ".\n" . \
        "It was down for " . $Count . " checks since " . ($Metric->"since") . ".");
      :if ([ :typeof ($HostInfo->"up-hook") ] = "str") do={
        $LogPrintExit info ("Running hook on host " . $HostName . " up: " . ($HostInfo->"up-hook")) false;
        [ :parse ($HostInfo->"up-hook") ];
      }
    }
    :set ($Metric->"notified") false;
    :set ($Metric->"parent") ($HostInfo->"parent");
    :set ($Metric->"since");
  } else={
    :set ($Metric->"count") ($Metric->"count" + 1);
    :set ($Metric->"parent") ($HostInfo->"parent");
    :set ($Metric->"since") ($HostVal->"since");
    :local Count [ $IfThenElse ([ :tonum ($HostInfo->"count") ] > 0) ($HostInfo->"count") 5 ];
    :local Parent ($HostInfo->"parent");
    :while ([ :len $Parent ] > 0) do={
      :set Count ($Count + 1);
      :set Parent ($NetwatchNotify->$Parent->"parent");
    }
    :set Parent ($HostInfo->"parent");
    :local ParentNotified false;
    :while ($ParentNotified = false && [ :len $Parent ] > 0) do={
      :set ParentNotified [ $IfThenElse (($NetwatchNotify->$Parent->"notified") = true) true false ];
      :if ($ParentNotified = false) do={
        :set Parent ($NetwatchNotify->$Parent->"parent");
      }
    }
    $LogPrintExit info ("Host " . $HostName . " (" . $HostVal->"host" . ") is down for " . \
      $Metric->"count" . " checks, " . [ $IfThenElse ($ParentNotified = false) [ $IfThenElse \
      ($Metric->"notified" = true) ("already notified.") ($Count - $Metric->"count" . " to go.") ] \
      ("parent host " . $Parent . " is down.") ]) false;
    :if ($ParentNotified = false && $Metric->"count" >= $Count && $Metric->"notified" != true) do={
      $SendNotification ([ $SymbolForNotification "cross-mark" ] . "Netwatch Notify: " . $HostName . " down") \
        ("Host " . $HostName . " (" . $HostVal->"host" . ") is down since " . $HostVal->"since" . ".");
      :set ($Metric->"notified") true;
      :if ([ :typeof ($HostInfo->"down-hook") ] = "str") do={
        $LogPrintExit info ("Running hook on host " . $HostName . " down: " . ($HostInfo->"down-hook")) false;
        [ :parse ($HostInfo->"down-hook") ];
      }
    }
  }
  :set ($NetwatchNotify->$HostName) {
    "count"=($Metric->"count");
    "notified"=($Metric->"notified");
    "parent"=($Metric->"parent");
    "since"=($Metric->"since") };
}