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Cache locking support
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parent
336d120bb5
commit
4842cdaee1
@ -46,35 +46,56 @@ zaf_tocache(){
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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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rm -f $ZAF_CACHE_DIR/$key $ZAF_CACHE_DIR/${key}.info
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echo "$2" >$ZAF_CACHE_DIR/$key
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echo "$1" >$ZAF_CACHE_DIR/${key}.info
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datafile=$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" $ZAF_CACHE_DIR/${key}.info
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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 ] && return 1
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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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rm -f $ZAF_CACHE_DIR/$key $ZAF_CACHE_DIR/${key}.info
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cat >$ZAF_CACHE_DIR/$key
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if [ -s $ZAF_CACHE_DIR/$key ]; then
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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=$expiry]" >$ZAF_CACHE_DIR/${key}.info
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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" $ZAF_CACHE_DIR/$key.info
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cat $ZAF_CACHE_DIR/$key
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touch -m -d "$expiry" $infofile
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cat $datafile
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rm -f $lockfile
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else
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rm -f "$ZAF_CACHE_DIR/$key"
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rm -f "$datafile"
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fi
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}
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@ -104,12 +125,18 @@ 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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if [ -f $ZAF_CACHE_DIR/$key ]; then
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! [ -f "$ZAF_CACHE_DIR/$key.info" ] && { return 3; }
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if [ "$ZAF_CACHE_DIR/$key.info" -nt "$ZAF_CACHE_DIR/$key" ]; then
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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 $ZAF_CACHE_DIR/$key
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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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@ -121,3 +148,4 @@ zaf_fromcache(){
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fi
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}
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