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 #!/bin/sh
 #
 # chkconfig: - 85 15
 #
 # description: Panda Harvester uWSGI
 # processname: uwsgi
 # config: ${VIRTUAL_ENV}/etc/sysconfig/panda_harvester
 # pidfile: ${LOG_DIR}/panda_harvester.pid
 
 # When multiple arguments are given, only the error from the
 # last one is reported.
 #
 ARGV="$@"
 #
 
 set -a
 #======= START CONFIGURATION SECTION ==========================
 # user and group to run harvester uWSGI
 # FIXME
 userName=atlpan
 # FIXME
 groupName=zp
 
 # setup python and virtual env
 # FIXME
 VIRTUAL_ENV=/opt/harvester
 
 # set log directory
 # FIXME
 LOG_DIR=/var/log/panda
 
 # pid and local info files
 if [[ -z "${PANDA_LOCK_DIR}" ]]; then
     PIDFILE=${LOG_DIR}/panda_harvester.pid
     LOCAL_INFO_FILE=${LOG_DIR}/.harvester_info
 else
     PIDFILE=${PANDA_LOCK_DIR}/panda_harvester.pid
     LOCAL_INFO_FILE=${PANDA_LOCK_DIR}/.harvester_info
 fi
 
 # log files
 HSTDOUT=${LOG_DIR}/panda_harvester_stdout.log
 HSTDERR=${LOG_DIR}/panda_harvester_stderr.log
 
 
 # check interval in second and max number of check attempts of process handle
 checkInterval=1
 maxCheckAttempts=30
 
 # uWSGI socket address
 uwsgiSocket="127.0.0.1:3334"
 
 # http and/or https router
 # Make uWSGI spawn an http proxy process. Use this only when http is needed and
 # no other frontend proxy/webserver (nginx, apache, etc.) is set for harvester
 # For http, only address required
 # For https, the concatenated string of address,hostcert,hostkey should be set
 # and more optional string (,cipher_suite,ca_cert) can be concatenated after
 #httpRouter=":25080"
 #httpsRouter=":25443,hostcert.pem,hostkey.pem,HIGH,ca-bundle.pem"
 
 # number of uwsgi processes and threads
 nProcesses=2
 nThreads=4
 
 # uWSGI configuration file
 # Path of the configuration file in .ini format. Optional.
 # If set, uWSGI will run according to the configuration file alone and the
 # env variables set above will not take effect. However, one can still
 # use them in the configuration file in form of $(ENV_VAR) as well.
 #uwsgiConfig=${VIRTUAL_ENV}/etc/panda/panda_harvester-uwsgi.ini
 
 #======= END CONFIGURATION SECTION ============================
 set +a
 
 # load module python
 if [ -r ${VIRTUAL_ENV}/bin/activate ]; then
     . ${VIRTUAL_ENV}/bin/activate
 fi
 
 # source harvester env variables
 if [ -r ${VIRTUAL_ENV}/etc/sysconfig/panda_harvester ]; then
     . ${VIRTUAL_ENV}/etc/sysconfig/panda_harvester
 fi
 
 # prescript
 PRESCRIPT="python ${SITE_PACKAGES_PATH}/pandaharvester/harvesterscripts/prescript.py -f ${LOCAL_INFO_FILE}"
 
 # handle uWSGI program
 if [ "x${uwsgiConfig}y" != "xy" ]; then
     PROGNAME="uwsgi ${uwsgiConfig}"
 else
     [ "x${httpRouter}y" != "xy" ] && httpRouter_option="--http ${httpRouter}"
     [ "x${httpsRouter}y" != "xy" ] && httpsRouter_option="--https ${httpsRouter}"
     PROGNAME="uwsgi --socket ${uwsgiSocket} ${httpRouter_option} ${httpsRouter_option}
         --master --lazy-apps --chdir ${VIRTUAL_ENV}
         --wsgi-file ${SITE_PACKAGES_PATH}/pandaharvester/harvesterbody/master.py
         --processes ${nProcesses} --threads ${nThreads} --worker-reload-mercy 1
         --safe-pidfile ${PIDFILE} --uid ${userName} --gid ${groupName}
         --post-buffering 32768 --buffer 32768"
 fi
 
 
 function check_pidfile_running () {
     itry=0
     while [ "$itry" -lt "$maxCheckAttempts" ]; do
         itry=$((itry + 1))
         sleep $checkInterval
         if [ ! -f ${PIDFILE} ]; then
             continue
         fi
         if ps -o pid -p `cat ${PIDFILE}` >& /dev/null ; then
             return 0
         fi
     done
     echo "ERROR: check_pidfile_running timeout"
     return 1
 }
 
 function check_pidfile_killed () {
     if [ ! -f ${PIDFILE} ]; then
         echo "ERROR: pidfile:${PIDFILE} does not exist"
         return 1
     fi
     itry=0
     while [ "$itry" -lt "$maxCheckAttempts" ]; do
         itry=$((itry + 1))
         sleep $checkInterval
         if ! ps -o pid -p `cat ${PIDFILE}` >& /dev/null ; then
             return 0
         fi
     done
     echo "ERROR: check_pidfile_killed timeout"
     return 1
 }
 
 function check_pidfile_children_respawn () {
     if [ ! -f ${PIDFILE} ]; then
         echo "ERROR: pidfile:${PIDFILE} does not exist"
         return 1
     fi
     itry=0
     while [ "$itry" -lt "$maxCheckAttempts" ]; do
         itry=$((itry + 1))
         sleep $checkInterval
         _old_processes=`echo $@`
         _processes=$(ps -o pid --ppid `cat ${PIDFILE}`)
         ERROR=$?
         if [ $ERROR = 0 ]; then
             _old_processes=$(python -c "print(' '.join('$_old_processes'.split()))")
             _processes=$(python -c "print(' '.join('`echo $_processes`'.split()))")
             _python_command="if set('`echo $_old_processes`'.split()).intersection(set('`echo $_processes`'.split())) == set(['PID']) and len('`echo $_processes`'.split()) >= int(${nProcesses}) + bool('${httpRouter_option}'): print(0)"
             _ret=$(python -c "$_python_command")
             [ "$_ret" == "0" ] && return 0
         fi
     done
     echo "ERROR: check_pidfile_children_running timeout"
     return 1
 }
 
 
 case $ARGV in
 start)
     if [ -f ${PIDFILE} ]; then
         echo ERROR: Harvester is already running with pidfile:${PIDFILE}
     else
         echo Run harvester prescript
         ${PRESCRIPT}
         echo Start Harvester
         ${PROGNAME} >> ${HSTDOUT} 2>> ${HSTDERR} &
         check_pidfile_running
         ERROR=$?
         if [ $ERROR = 0 ]; then
         echo "succeeded"
             break
         else
             echo "failed with exit code $ERROR"
             [ -f ${PIDFILE} ] && rm -f ${PIDFILE}
         fi
     fi
     ;;
 runfg)
     echo Run harvester prescript
     ${PRESCRIPT}
     echo Run Harvester in foreground
     ${PROGNAME} >> ${HSTDOUT} 2>> ${HSTDERR}
     rm -f ${PIDFILE}
     ;;
 stop)
     if [ ! -f ${PIDFILE} ]; then
         echo "WANRING: pidfile:${PIDFILE} does not exist. Nothing done"
     else
         echo Stop Harvester
         uwsgi --stop ${PIDFILE}
         check_pidfile_killed
         ERROR=$?
         if [ $ERROR = 0 ]; then
             echo "succeeded"
             rm -f ${PIDFILE}
         else
             echo "failed with exit code $ERROR"
         fi
     fi
     rm -f ${PIDFILE}
     ;;
 reload)
     if [ ! -f ${PIDFILE} ]; then
         echo "ERROR: pidfile:${PIDFILE} does not exist"
     else
         echo Reload Harvester
         _old_processes=$(ps -o pid --ppid `cat ${PIDFILE}`)
         uwsgi --reload ${PIDFILE}
         check_pidfile_children_respawn $_old_processes
         ERROR=$?
         if [ $ERROR = 0 ]; then
             echo "succeeded"
         else
             echo "failed with exit code $ERROR"
         fi
     fi
     ;;
 *)
     echo ERROR: unknown command $ARGV
     ERROR=1
 esac
 
 exit $ERROR

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