A daemon to monitor and restart the solr server on our slave host

solr_heartbeatd

#!/bin/bash
url='http://www.sitetomonitor.com/provider_search?utf8=%E2%9C%93&search%5Bquery%5D=aba+therapist&search%5Blocation%5D=San+Francisco%2C+CA&commit=Search'
self=$(basename $0)

if [ -w "/var/run" ]; then
  pidfile="/var/run/$self.pid"
else
  pidfile="/tmp/$self.pid"
fi

if [ -w "/var/log" ]; then
  logfile="/var/log/$self.log"
else
  logfile="/tmp/$self.log"
fi

install_dir=/app/current
solr_pidfile=$install_dir/tmp/pids/production/sunspot-solr.pid

function log() {
  echo "$(hostname) $(date): $1" >> $logfile
}

function tee() {
  echo "$1"
  log "$1"
}

function heartbeatd() {
  while :
  do
    status=$(curl -sw "%{http_code}" -o /dev/null "$url")

    if [ $status == "200" ]; then
      log "200 OK"
      sleep 15
    else
      log "Problem - Received ($status) code"

      if [ -f $solr_pidfile ]; then
        log 'restarting solr on host'
        (cd $install_dir && kill -9 $(cat $solr_pidfile) && rake search:start RAILS_ENV=production)
        sleep 60
      fi
    fi
  done
}

case $1 in
  start)
    if [ -f $pidfile ]; then
      ps $(cat $pidfile) 2>&1 > /dev/null

      if [ $? -eq 0 ]; then
        echo 'already running...exiting!'
        exit
      else
        rm $pidfile
      fi
    fi

    heartbeatd 2>&1 >> $logfile &
    echo $! > $pidfile
    tee "server started with pid $!"
    ;;
  stop)
    tee "Shutting down the server now"
    if [ -f $pidfile ]; then
      kill $(cat $pidfile) 2>&1 > /dev/null

      if [ $? -eq 0 ]; then
        rm $pidfile
        tee 'complete'
        exit 0
      else
        tee 'ERROR!'
        tee 'Uable to stop server: kill manually'
        tee "pidfile: $pidfile"
        exit 1
      fi
    else
      tee 'no pid file...exiting'
      exit 1
    fi
    ;;
  status)
    if [ -f $pidfile ]; then
      ps $(cat $pidfile) 2>&1 > /dev/null

      if [ $? -eq 0 ]; then
        echo 'running'
      fi
    else
      echo 'not running'
    fi
    ;;
  *)
    echo 'usage: solr_heartbeatd [start|stop|status]'
    exit 1
    ;;
esac