mirror of https://github.com/limosek/zaf.git
157 lines
3.2 KiB
Bash
157 lines
3.2 KiB
Bash
# Zaf cache related functions
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zaf_cache_init(){
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local files
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local file
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if [ "$ZAF_CACHE_DIR" = "/tmp/zafc" ] && ! [ -d "$ZAF_CACHE_DIR" ]; then
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mkdir -p $ZAF_CACHE_DIR
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chown $ZAF_FILES_UID $ZAF_CACHE_DIR >/dev/null 2>/dev/null
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fi
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if ! [ -w $ZAF_CACHE_DIR ]; then
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zaf_dbg "Cache dir $ZAF_CACHE_DIR is not accessible! Disabling cache."
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fi
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}
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zaf_cache_clean(){
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local files
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if [ -w "$ZAF_CACHE_DIR" ]; then
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zaf_wrn "Removing cache entries"
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files=$(find $ZAF_CACHE_DIR/ -type f)
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[ -n "$files" ] && rm -f $files
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else
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zaf_dbg "Cache dir not set. Disabling cache."
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fi
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zaf_cache_init
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}
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# Get cache key from requested param
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zaf_cache_key(){
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echo "$1" | (md5sum - ||md5) 2>/dev/null | cut -d ' ' -f 1
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}
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# Wait for lock
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# $1 - key
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zaf_cache_lock(){
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local lockfile
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lockfile="${ZAF_CACHE_DIR}/${key}.lock"
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[ -f "$lockfile" ] && sleep 1
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[ -f "$lockfile" ] && return 1
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return 0
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}
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# Unlock cache key
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# $1 - key
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zaf_cache_unlock(){
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local lockfile
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lockfile="${ZAF_CACHE_DIR}/${key}.lock"
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rm -f $lockfile
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}
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# Put object into cache
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# $1 key
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# $2 value
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# $3 lifetime in seconds
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zaf_tocache(){
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! [ -w $ZAF_CACHE_DIR ] && return
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local key
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local value
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local expiry
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local infofile
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local datafile
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key=$(zaf_cache_key "$1")
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datafile=${ZAF_CACHE_DIR}/$key
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infofile=${ZAF_CACHE_DIR}/${key}.info
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zaf_cache_lock "$key" || { zaf_wrn "Cache: Entry $1[$key] locked!"; return 1; }
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rm -f $datafile $infofile
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echo "$2" >$datafile
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echo "$1" >$infofile
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expiry=$(zaf_date_add "$3")
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zaf_trc "Cache: Saving entry $1[$key,expiry=$expiry]"
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touch -m -d "$expiry" $infofile
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zaf_cache_unlock $key
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}
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# Put object into cache from stdin and copy to stdout
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# $1 key
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# $2 lifetime in seconds
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zaf_tocache_stdin(){
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! [ -w $ZAF_CACHE_DIR ] && { cat; return; }
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local key
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local expiry
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local infofile
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local datafile
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key=$(zaf_cache_key "$1")
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datafile=${ZAF_CACHE_DIR}/$key
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lockfile=${ZAF_CACHE_DIR}/${key}.lock
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infofile=${ZAF_CACHE_DIR}/${key}.info
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zaf_cache_lock "$key" || { zaf_wrn "Cache: Entry $1[$key] locked!"; return 1; }
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rm -f $datafile $infofile
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cat >$datafile
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expiry="$(zaf_date_add $2)"
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echo "$1 [key=$key,expiry=$expiry]" >$infofile
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zaf_trc "Cache: Saving entry $1[key=$key,expiry=$expiry]"
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touch -m -d "$expiry" $infofile
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zaf_cache_unlock "$key"
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cat $datafile
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}
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# Remove entry from cache
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# $1 key
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zaf_cache_delentry(){
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! [ -w $ZAF_CACHE_DIR ] && return 1
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local key
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key=$(zaf_cache_key "$1")
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zaf_trc "Cache: removing $1($key) from cache"
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rm -f "${ZAF_CACHE_DIR}/$key*"
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}
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# List entries in cache
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zaf_cache_list(){
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! [ -w $ZAF_CACHE_DIR ] && return 1
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local i
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ls ${ZAF_CACHE_DIR}/*info >/dev/null 2>/dev/null || return 1
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local key
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for i in ${ZAF_CACHE_DIR}/*info; do
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cat $i
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done
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}
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# Get object from cache
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# $1 key
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zaf_fromcache(){
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! [ -w $ZAF_CACHE_DIR ] && return 3
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local key
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local value
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local infofile
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local datafile
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key=$(zaf_cache_key "$1")
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datafile="${ZAF_CACHE_DIR}/${key}"
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infofile="${ZAF_CACHE_DIR}/${key}.info"
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if [ -f $datafile ]; then
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if [ "$infofile" -nt "$datafile" ]; then
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zaf_trc "Cache: serving $1($key) from cache"
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cat "$datafile"
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else
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zaf_cache_delentry $key
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return 2
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fi
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else
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zaf_trc "Cache: missing entry $1($key)"
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return 1
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fi
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}
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