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limosek-zaf/lib/cache.lib.sh
2016-04-21 15:59:29 +02:00

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# Zaf cache related functions
zaf_cache_clean(){
if [ -n "$ZAF_CACHE_DIR" ]; then
zaf_wrn "Removing cache entries"
rm -rf "$ZAF_CACHE_DIR"
else
zaf_err "Cache dir not set."
fi
mkdir -p "$ZAF_CACHE_DIR"
if zaf_is_root; then
chmod 770 "$ZAF_CACHE_DIR"
chgrp zabbix "$ZAF_CACHE_DIR"
fi
}
# Get cache key from requested param
zaf_cache_key(){
echo "$1" | (md5sum - ||md5) 2>/dev/null | cut -d ' ' -f 1
}
# Put object into cache
# $1 key
# $2 value
# $3 lifetime in seconds
zaf_tocache(){
! [ -w $ZAF_CACHE_DIR ] && return 1
local key
local value
local expiry
key=$(zaf_cache_key "$1")
rm -f $ZAF_CACHE_DIR/$key $ZAF_CACHE_DIR/${key}.info
echo "$2" >$ZAF_CACHE_DIR/$key
echo "$1" >$ZAF_CACHE_DIR/${key}.info
expiry=$(zaf_date_add "$3")
zaf_trc "Cache: Saving entry $1[$key,expiry=$expiry]"
touch -m -d "$expiry" $ZAF_CACHE_DIR/${key}.info
}
# Put object into cache from stdin and copy to stdout
# $1 key
# $2 lifetime in seconds
zaf_tocache_stdin(){
! [ -w $ZAF_CACHE_DIR ] && return 1
local key
local expiry
key=$(zaf_cache_key "$1")
rm -f $ZAF_CACHE_DIR/$key $ZAF_CACHE_DIR/${key}.info
cat >$ZAF_CACHE_DIR/$key
if [ -s $ZAF_CACHE_DIR/$key ]; then
expiry="$(zaf_date_add $2)"
echo "$1 [key=$key,expiry=$expiry]" >$ZAF_CACHE_DIR/${key}.info
zaf_trc "Cache: Saving entry $1[key=$key,expiry=$expiry]"
touch -m -d "$expiry" $ZAF_CACHE_DIR/$key.info
cat $ZAF_CACHE_DIR/$key
else
rm -f "$ZAF_CACHE_DIR/$key"
fi
}
# Remove entry from cache
# $1 key
zaf_cache_delentry(){
! [ -w $ZAF_CACHE_DIR ] && return 1
local key
key=$(zaf_cache_key "$1")
zaf_trc "Cache: removing $1($key) from cache"
rm -f "$ZAF_CACHE_DIR/$key*"
}
# List entries in cache
zaf_cache_list(){
local i
ls $ZAF_CACHE_DIR/*info >/dev/null 2>/dev/null || return 1
local key
for i in $ZAF_CACHE_DIR/*info; do
cat $i
done
}
# Get object from cache
# $1 key
zaf_fromcache(){
! [ -r $ZAF_CACHE_DIR ] || [ -n "$ZAF_NOCACHE" ] && return 1
local key
local value
key=$(zaf_cache_key "$1")
if [ -f $ZAF_CACHE_DIR/$key ]; then
! [ -f "$ZAF_CACHE_DIR/$key.info" ] && { return 3; }
if [ "$ZAF_CACHE_DIR/$key.info" -nt "$ZAF_CACHE_DIR/$key" ]; then
zaf_trc "Cache: serving $1($key) from cache"
cat $ZAF_CACHE_DIR/$key
else
zaf_trc "Cache: removing old entry $1"
rm -f "$ZAF_CACHE_DIR/$key*"
return 2
fi
else
zaf_trc "Cache: missing entry $1($key)"
return 1
fi
}