mirror of https://github.com/limosek/zaf.git
152 lines
3.3 KiB
Bash
152 lines
3.3 KiB
Bash
# Zaf cache related functions
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zaf_cache_init(){
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if [ -z "$ZAF_CACHE_DIR" ] || [ "$ZAF_CACHE_DIR" = "/tmp/zafc" ]; then
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ZAF_CACHE_DIR=${ZAF_TMP_DIR}/zafc
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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_trc "Cache: Removing stale entries"
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(cd $ZAF_CACHE_DIR && find ./ -type f -name '*.info' -mmin +1 2>/dev/null | \
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while read line ; do
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rm -f $line $(basename $line .info)
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done
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)
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else
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zaf_dbg "Cache dir $ZAF_CACHE_DIR is not accessible! Disabling cache."
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fi
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}
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zaf_cache_clean(){
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if [ -n "$ZAF_CACHE_DIR" ]; then
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zaf_wrn "Removing cache entries"
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(cd $ZAF_CACHE_DIR && find ./ -type f -name '*.info' 2>/dev/null | \
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while read line ; do
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rm -f $line $(basename $line .info)
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done
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)
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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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# 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 $ZAF_CACHE_DIR ] && return 1
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local key
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local value
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local expiry
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local lockfile
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local infofile
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local datafile
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key=$(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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[ -f $lockfile ] && return 1 # Key is locked, return
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touch $lockfile
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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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rm -f $lockfile
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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 $ZAF_CACHE_DIR ] && { cat; return 1; }
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local key
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local expiry
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local lockfile
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local infofile
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local datafile
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key=$(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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[ -f $lockfile ] && return 1 # Key is locked, return
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touch $lockfile
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rm -f $datafile $infofile
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cat >$datafile
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if [ -s $datafile ]; then
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expiry="$(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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cat $datafile
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rm -f $lockfile
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else
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rm -f "$datafile"
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fi
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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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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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! [ -r $ZAF_CACHE_DIR ] || [ -n "$ZAF_NOCACHE" ] && return 1
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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 $datafile ]; then
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! [ -f "$infofile" ] && { return 3; }
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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_trc "Cache: removing old entry $1"
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rm -f "$ZAF_CACHE_DIR/$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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