usr-local-bin-loris-cache-clean

#!/bin/bash
# avoids race conditions by stopping the server before attempting to
# clean files and folders in the caches
# also, in case the occupied size is too high to safely execute 
# loris-cache-clean in time, goes for the forest-burning loris-cache-purge
# which deletes everything without taking LRU policies into consideration
# run as root

set -e

if [ "$#" -lt 2 ]; then
    echo "Usage: loris-cache-clean SOFT_MAX_SIZE_KILOBYTES HARD_MAX_SIZE_KILOBYTES"
    echo "Sample: loris-cache-clean 10000000 20000000"
    echo "       will clean the cache with LRU policies if used disk space is more than 10GB"
    echo "       will purge the cache deleting everything if used disk space is more than 20GB"
    exit 1
fi

current_usage_cache_root () {
    df -k {{ pillar.iiif.loris.storage }} --output=used | sed 1d
}

log_message () {
    logger "$1" --tag "loris-cache-clean"
}

log_message "Started loris-cache-clean (arguments $1 $2)"

soft_limit="$1"
hard_limit="$2"

usage=$(current_usage_cache_root)
log_message "Cache at $usage kb"
if [ "$usage" -lt "$soft_limit" ]; then
    log_message "Nothing to do"
    exit 0
fi

if [ "$usage" -lt "$hard_limit" ]; then
#    systemctl stop nginx
#    log_message "Starting loris-cache-clean-soft"
#    timeout 240 /usr/local/bin/loris-cache-clean-soft "$soft_limit" || log_message "TIMEOUT OF loris-cache-clean-soft"
#    log_message "Completed loris-cache-clean-soft"
#    systemctl start nginx
    log_message "Skipping loris-cache-clean-soft (disabled)"
else
    systemctl stop nginx
    log_message "Starting loris-cache-clean-hard"
    /usr/local/bin/loris-cache-clean-hard || log_message "FAILED loris-cache-clean-hard"
    log_message "Completed loris-cache-clean-hard"
    systemctl start nginx
fi