File size: 1,687 Bytes
c02f046 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | var cachou = require('cachou');
var cacheKey = require('./cache-key');
/**
* Expose module.
*/
module.exports = resourceCacheFactory;
/**
* Return a new instance of ResourceCache.
*
* @param {Object} options
*/
function resourceCacheFactory(options) {
return new ResourceCache(options);
}
/**
* Create a new instance of ResourceCache.
*
* @param {Object} options
*/
function ResourceCache(options) {
var cache = this._cachou = cachou(options.cachou);
var globalOptions = options;
this.read = readFactory;
this.populate = populateFactory;
this.invalidate = invalidateFactory;
/**
* Read the cache and serve it if avalaible.
*/
function readFactory(options) {
options = options || globalOptions;
return function read(req, res, next) {
var key = cacheKey.format(options.name, req.query.id, req.query);
cache.get(key, function (err, cacheRes) {
if (err) return next(err);
// Populate and body and stop.
if (cacheRes) {
res.body = cacheRes;
res.end();
}
next();
});
};
}
/**
* Populate the cache.
*/
function populateFactory(options) {
options = options || globalOptions;
return function populate(req, res, next) {
var key = cacheKey.format(options.name, req.query.id, req.query);
cache.set(key, res.body);
next();
};
}
/**
* Invalidate the cache.
*/
function invalidateFactory(options) {
options = options || globalOptions;
return function invalidate(req, res, next) {
var matcher = cacheKey.formatMatcher(options.name, req.query.id);
cache.delAll(matcher, next);
};
}
} |