#!/usr/bin/env 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.


# Health check script for the Secondary Storage VM

# DNS server is specified.


CMDLINE=/var/cache/cloud/cmdline
for i in `cat $CMDLINE`
do
   key=`echo $i | cut -d= -f1`
   value=`echo $i | cut -d= -f2`
   case $key in
      host)
         MGMTSERVER=$value
         ;;
   esac
done

isCifs() {
 mount | grep "type cifs" > /dev/null
 echo $?
}

# ping dns server
echo ================================================
DNSSERVER=`grep -E '^nameserver' /etc/resolv.conf  | awk '{print $2}'| head -1`
echo "First DNS server is " $DNSSERVER
ping -c 2  $DNSSERVER
if [ $? -eq 0 ]
then
    echo "Good: Can ping DNS server"
else
    echo "WARNING: cannot ping DNS server"
    echo "route follows"
    route -n
fi


# check dns resolve
echo ================================================
nslookup cloudstack.apache.org 1> /tmp/dns 2>&1
grep 'no servers could' /tmp/dns 1> /dev/null 2>&1
if [ $? -eq 0 ]
then
    echo "ERROR: DNS not resolving cloudstack.apache.org"
    echo resolv.conf follows
    cat /etc/resolv.conf
    exit 2
else
    echo "Good: DNS resolves cloudstack.apache.org"
fi


# check to see if we have the NFS volume mounted
echo ================================================
storage="cifs"
if [ $(isCifs) -ne 0 ] ;
 then
   storage="nfs"
fi

mount|grep -v sunrpc|grep -v rpc_pipefs|grep $storage 1> /dev/null 2>&1
if [ $? -eq 0 ]
then
    echo "$storage is currently mounted"
    # check for write access
    for MOUNTPT in `mount|grep -v sunrpc|grep -v rpc_pipefs|grep $storage| awk '{print $3}'`
    do
        if [ $MOUNTPT != "/proc/xen" ] # mounted by xen
        then
            echo Mount point is $MOUNTPT
            touch $MOUNTPT/foo
            if [ $? -eq 0 ]
            then
                echo "Good: Can write to mount point"
                rm $MOUNTPT/foo
            else
                echo "ERROR: Cannot write to mount point"
                echo "You need to export with norootsquash"
            fi
        fi
     done
else
    echo "ERROR: Storage $storage is not currently mounted"
    echo "Verifying if we can at least ping the storage"
    STORAGE_ADDRESSES=`grep "secondaryStorageServerAddress" $CMDLINE | sed -E 's/.*secondaryStorageServerAddress=([^ ]*).*/\1/g'`

    if [[ -z "$STORAGE_ADDRESSES" ]]
    then
      STORAGE_NETWORK_GATEWAY=`grep "storagegateway" $CMDLINE | sed -E 's/.*storagegateway=([^ ]*).*/\1/g'`
      echo "Storage address list is empty, trying to ping storage network gateway instead ($STORAGE_NETWORK_GATEWAY)"
      ping -c 2  $STORAGE_NETWORK_GATEWAY
      if [ $? -eq 0 ]
      then
        echo "Good: Can ping $storage storage network gateway"
      else
        echo "WARNING: Cannot ping $storage storage network gateway"
        echo routing table follows
        route -n
      fi
    else
      echo "Storage address(s): $STORAGE_ADDRESSES, trying to ping"
      STORAGE_ADDRESS_LIST=$(echo $STORAGE_ADDRESSES | tr "," "\n")
      for STORAGE_ADDRESS in $STORAGE_ADDRESS_LIST
      do
        echo "Pinging storage address: $STORAGE_ADDRESS"
        ping -c 2  $STORAGE_ADDRESS
        if [ $? -eq 0 ]
        then
          echo "Good: Can ping $storage storage address"
        else
          echo "WARNING: Cannot ping $storage storage address"
          echo routing table follows
          route -n
        fi
      done
    fi

fi


# check for connectivity to the management server
echo ================================================
echo Management server is $MGMTSERVER.  Checking connectivity.
IFS=',' read -r -a hosts <<< "$MGMTSERVER"
for host in "${hosts[@]}"
do
    socatout=$(echo | socat - TCP:$host:8250,connect-timeout=3 | tr -d '\0' 2>&1)
    if [ $? -eq 0 ]
    then
        echo "Good: Can connect to management server $host port 8250"
    else
        echo "ERROR: Cannot connect to $host port 8250"
        echo $socatout
        exit 4
    fi
done


# check for the java process running
echo ================================================
ps -eaf|grep -v grep|grep java 1> /dev/null 2>&1
if [ $? -eq 0 ]
then
    echo "Good: Java process is running"
else
    echo "ERROR: Java process not running.  Try restarting the SSVM."
    exit 3
fi

echo ================================================
echo Tests Complete. Look for ERROR or WARNING above.

exit 0