Hi,
I'm trying to develop a web application with node, express and mysql. I'm
using Redis for SQL caching.
I wrote this module for caching for my web app and I use these functions
throughout my project to access redis.
function cache() {
this.client = redis.createClient();
this.client.flushall();
this.stats = {
hits: 0,
misses: 0,
keys: 0
};
}
cache.prototype.get = function(hash, key, cb) { //call it as .get(err,
value)
if(this.client.hexists(hash, key)) {
this.stats.hits++;
this.client.hget(hash, key, function(err, val) {
if(err) {
throw err;
} else {
cb(null, JSON.parse(val));
}
});
} else {
this.stats.misses++;
cb(null, null);
}
};
var vlmCache = new cache();
module.exports.vlmCache = vlmCache;
Other functions I've omitted like invalidate, set etc are omitted from this
copy paste.
The issue I am facing is that even if the key exists or doesn't exists,
this.client.hexists result in a true value t he first time it is called.
Output is correct the second time it is called. I'm unable to figure out
the problem in it.
In my modules, I require this caching module and use such code to access
cache.
cache.vlmCache.get("movies", sql, function(err, value) {
if(value !== null) {
console.log("got data from cache");
console.log(JSON.stringify(cache.vlmCache.getStats()));
res.send(JSON.stringify(value));
} else {
I tried to create and close the client in my specific module as well, but a
similar behavior. If I don't use my cache functions, the output is correct.
Please suggest.
Regards
Neeraj
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