#!/bin/bash
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

ROUTER_BIN_PATH="/ramdisk/rrouter"
ROUTER_LOG="${ROUTER_BIN_PATH}/keepalived.log"
STRIKE_FILE="$ROUTER_BIN_PATH/keepalived.strikes"
TS_FILE="$ROUTER_BIN_PATH/keepalived.ts"
CT_FILE="$ROUTER_BIN_PATH/keepalived.ct"

checktime=$(date +%s)
hbtime=$(cat $TS_FILE)
diff=$(($checktime - $hbtime))

lastcheck=0
if [ -e $CT_FILE ]
then
    lastcheck=$(cat $CT_FILE 2>/dev/null)
fi
checkdiff=$(($checktime - $lastcheck))
if [ $checkdiff -ge 0 ] && [ $checkdiff -lt 30 ]
then
    exit
fi
echo $checktime > $CT_FILE

s=0
if [ $diff -gt 10 ]
then
    if [ -e $STRIKE_FILE ]
    then
        s=$(cat $STRIKE_FILE 2>/dev/null)
    fi
    s=$(($s+1))
    echo $s > $STRIKE_FILE
    echo "Check time: $checktime, last heartbeat time: $hbtime, time diff: $diff, strike count: $s" >> $ROUTER_LOG
else
    rm -f $STRIKE_FILE
fi

if [ $s -gt 3 ]
then
    systemctl stop --now keepalived >> $ROUTER_LOG 2>&1
    systemctl stop --now conntrackd >> $ROUTER_LOG 2>&1

    #Set fault so we have the same effect as a KeepaliveD fault.
    python /opt/cloud/bin/configure_router.py --fault

    pkill -9 keepalived >> $ROUTER_LOG 2>&1 || true
    pkill -9 conntrackd >> $ROUTER_LOG 2>&1 || true
    echo Status: FAULT \(keepalived process is dead\) >> $ROUTER_LOG
    exit
fi