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#!/bin/sh

# Start/stop/restart pgbouncer - Lightweight connection pooler for PostgreSQL.
# Copyright (c) 2015, Antonio Hernández Blas <hba.nihilismus@gmail.com>

#
#            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
#                    Version 2, December 2004
#
# Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
#
# Everyone is permitted to copy and distribute verbatim or modified
# copies of this license document, and changing it is allowed as long
# as the name is changed.
#
#            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
#   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
#
#  0. You just DO WHAT THE FUCK YOU WANT TO.
#

CONF='/etc/pgbouncer/pgbouncer.ini'
CMMD="/usr/bin/pgbouncer -d -q"

pgbouncer_start() {
  CMMD="$CMMD $CONF"
  if [ -x /usr/bin/pgbouncer ]; then
    if [ -f $CONF ]; then
      PIDOF=$(pgrep -f "$CMMD.*$CONF")
      if [ ! -z "$PIDOF" ]; then
        echo "Error, pgbouncer is already running."
      else
        echo "Starting pgbouncer:  $CMMD"
        $CMMD
      fi
    else
      echo "Error, file $CONF does not exist."
    fi
  fi
}

pgbouncer_stop() {
  PIDOF=$(pgrep -f "$CMMD.*$CONF")
  if [ -z "$PIDOF" ]; then
    echo "Error, pgbouncer is not running."
  else
    echo "Stoping pgbouncer:  /bin/kill -s SIGINT $PIDOF"
    /bin/kill -s SIGINT $PIDOF
  fi
}

pgbouncer_status() {
  PIDOF=$(pgrep -f "$CMMD.*$CONF")
  if [ ! -z "$PIDOF" ]; then
    echo "pgbouncer is running."
  else
    echo "pgbouncer is not running."
  fi
}

pgbouncer_online_restart() {
  PIDOF=$(pgrep -f "$CMMD.*$CONF")
  if [ ! -z "$PIDOF" ]; then
    CMMD="$CMMD -R $CONF"
    echo "Online restarting pgbouncer:  $CMMD"
    $CMMD
  else
    echo "Error, pgbouncer is not running."
  fi
}

case $1 in
  start)
    pgbouncer_start
  ;;
  stop)
    pgbouncer_stop
  ;;
  restart)
    pgbouncer_stop
    sleep 3
    pgbouncer_start
  ;;
  online-restart)
    pgbouncer_online_restart
  ;;
  status)
    pgbouncer_status
  ;;
  *)
    echo "Usage $0 {start|stop|restart|status|online-restart}"
    exit 1
  ;;
esac