tvheadendHealthCheck.sh

#!/bin/bash
# install stuff before using this script
#   sudo apt install libxml-xpath-perl curl

#configure your kodi settings
URL=localhost
PORT=9981
USERNAME=kodi
PASSWORD=kodi

WARNINGTIMEOUT=65
TIMEOUT=75
TIMEBEFORENEXTRECORD=15
POLLINGDURATION=60
LOGFILE="/home/pi/health.log"
# 2 days in minutes
NEXTRECORD=2880

#set start conditions
SECONDS=0

echo $(date && echo "Start polling") | tee -a "$LOGFILE"

while [ 1 ]; do
    # check if tvheadend is recording
    OUTPUT=$(curl --anyauth -u $USERNAME:$PASSWORD --silent --max-time 5 "http://$URL:$PORT/status.xml")
    if [ -z "$OUTPUT" ]; then
        echo "Tvheadend is not responding" | tee -a "$LOGFILE"
    else
        if echo $OUTPUT | grep "<status>Recording</status>" >/dev/null; then
            echo "Tvheadend is recording" | tee -a "$LOGFILE"
            #reset timer
            SECONDS=0
        fi

        if echo $OUTPUT | grep "<next>" >/dev/null; then
            echo "Tvheadend waiting for an upcomming record" | tee -a "$LOGFILE"
            echo $OUTPUT
            NEXTRECORD=$(echo $OUTPUT | xpath -q -e "/currentload/recordings[1]/recording/next/text()")
            echo Next recording starts in $NEXTRECORD minutes | tee -a "$LOGFILE"
            SECONDS=0
            if [ "$TIMEBEFORENEXTRECORD" -gt "$NEXTRECORD" ]; then
                echo "Tvheadend will start record in short time" | tee -a "$LOGFILE"
                SECONDS=0
            fi
        fi

        if echo $OUTPUT | grep "<subscriptions>" >/dev/null; then
            SUBS=$(echo $OUTPUT | xpath -q -e "/currentload/subscriptions/text()")
            if [ "$SUBS" -gt 1 ]; then
                echo "$SUBS subscriptions running" | tee -a "$LOGFILE"
                SECONDS=0
            elif [ "$SUBS" -eq 0 ]; then
                echo "No subscriptions" | tee -a "$LOGFILE"
            fi
        fi
    fi

    duration=$SECONDS

    #calc if timeout ocured -> restart service
    echo "$(($duration / 60)) minutes and $(($duration % 60)) seconds elapsed since last succesfull poll." | tee -a "$LOGFILE"
    if [ "$duration" -gt "$WARNINGTIMEOUT" ]; then

        echo "Warning: tvheadend is not resonding! Waiting grace time before restarting service." | tee -a "$LOGFILE"
        if [ "$duration" -gt "$TIMEOUT" ]; then

            #Convert $NEXTRECORD to seconds
            RECNS=$(($NEXTRECORD * 60))
            echo Next recording starts in $RECNS seconds | tee -a "$LOGFILE"

            echo $(date && echo "resarting tvheadend") | tee -a "$LOGFILE"
            /etc/init.d/tvheadend restart | tee -a "$LOGFILE"
            SECONDS=0
        fi
    fi
    sleep $POLLINGDURATION
done