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webgui/sbin/monitor_nchan
2024-01-06 10:47:12 +01:00

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#!/bin/bash
docroot=/usr/local/emhttp # webGui root folder
nchan_pid=/var/run/nchan.pid # keeps list of nchan processes registered by GUI
disk_load=/var/local/emhttp/diskload.ini # disk load statistics
nginx=/var/run/nginx.socket # nginx local access
status=http://localhost/pub/session?buffer_length=1 # nchan information about GUI subscribers
nchan_id=$(basename "$0")
# immediate kill command
if [[ $1 == kill ]]; then
[[ -s $nchan_pid ]] || exit
echo "Killing nchan processes..."
while IFS=$'\n' read -r running; do
name="${running##*/}"
# kill all processes or single process
if [[ -z $2 || $2 == ${name/:stop/} ]]; then
echo "$name"
pkill -f "$docroot/${running/:stop/}"
fi
done < $nchan_pid
if [[ -z $2 ]]; then
# remove pid file
rm -f $nchan_pid $disk_load
else
# remove single entry
sed -i "/$2/d" $nchan_pid
fi
exit
fi
start=$(date +%s)
while :; do
# only act when GUI registered nchan processes are running
if [[ -s $nchan_pid ]]; then
# get number of GUI nchan subscribers
subs=$(curl --unix-socket $nginx $status 2>/dev/null|grep -Pom1 'subscribers: \K\d+')
if [[ -z $subs || $subs -eq 0 ]]; then
sleep 5
# steady state?
subs=$(curl --unix-socket $nginx $status 2>/dev/null|grep -Pom1 'subscribers: \K\d+')
if [[ -z $subs || $subs -eq 0 ]]; then
now=$(date +%s)
# log at 1 hour interval
if [[ $((now-start)) -ge 3600 ]]; then
logger -t $nchan_id -- "Stop running nchan processes"
start=$now
fi
# kill GUI registered nchan processes
while IFS=$'\n' read -r running; do
pkill -f $docroot/${running/:stop/}
done < $nchan_pid
# empty GUI registered list & statistics
rm -f $nchan_pid $disk_load
fi
fi
fi
# check every 30 seconds
sleep 30
done &
disown %%