A script to monitor pgpool status

pgpool-check.sh

#!/bin/bash
MAILTO=mhotta@example.com
_INITDIR=~/.pgpool-check/init/
_CHECKDIR=~/.pgpool-check/current/

function _die   {
  echo $1
  exit 1
}

function _init  {
  rm -rf $_INITDIR $_CHECKDIR
  mkdir -p $_INITDIR $_CHECKDIR
  _check  $_INITDIR
  echo "initialize done."
  exit 0
}

function _check {

  if [ $# -eq 0 ]; then
    die "Please specify DIR."
  fi
  _DIR=$1
  cd $_DIR || _die "Do $0 -z to initialize app first."
  echo "pcp_node_count = $(pcp_node_count -w)" > pgpool_check.txt
  cat >> pgpool_check.txt <<___

pcp_node_info:
1. node hostname
2. node port number
3. status
4. wait for load balancing
5. backend status name
6. backend role
7. replication delay
8. replicaiton status (from  pg_stat_replication)
9. streaming replication status(from pg_stat_replication)
10. last update time of status

___
  pcp_node_info -w 0 |\
  awk '{print $1,$2,$3,$4,$5,$6,$8,$9}'     >> pgpool_check.txt
  pcp_node_info -w 1 |\
  awk '{print $1,$2,$3,$4,$5,$6,$8,$9}'     >> pgpool_check.txt
  cat >> pgpool_check.txt <<___
pcp_watchdog_info:
The 1st line indicates watchdog cluster info:
    1. all watchdog node number in a cluster
    2. Is the virtual IP activated on this node?
    3. master node name
    4. master node hostname
Following lines indicates watchdog nodes list:
    1. node name
    2. hostname
    3. pgpool port number
    4. watchdog port number
    5. current node status
    6. current node status name

___
  pcp_watchdog_info -w                      >> pgpool_check.txt
# echo "pcp_pool_status:"                   >> pgpool_check.txt
# pcp_pool_status -w                        >> pgpool_check.txt
}

if [ $# -ne 0 ] && [ "$1" == "-z" ]; then
  _init
else
  _check $_CHECKDIR
fi
diff -r $_INITDIR $_CHECKDIR >& /dev/null
if [ $? -ne 0 ]; then
# echo Sending mail
  diff -r $_INITDIR $_CHECKDIR > /tmp/pgpool-check-report.txt
  cat $_CHECKDIR/pgpool_check.txt >> /tmp/pgpool-check-report.txt
  cat /tmp/pgpool-check-report.txt | mail -s "pgpool-check.sh infomation." $MAILTO
fi