aaac7fed
 liuqimichale
add
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var createInnerCallback = require("./createInnerCallback");
function UnsafeCachePlugin(source, filterPredicate, cache, withContext, target) {
this.source = source;
this.filterPredicate = filterPredicate;
this.withContext = withContext;
this.cache = cache || {};
this.target = target;
}
module.exports = UnsafeCachePlugin;
function getCacheId(request, withContext) {
return JSON.stringify({
context: withContext ? request.context : "",
path: request.path,
query: request.query,
request: request.request
});
}
UnsafeCachePlugin.prototype.apply = function(resolver) {
var filterPredicate = this.filterPredicate;
var cache = this.cache;
var target = this.target;
var withContext = this.withContext;
resolver.plugin(this.source, function(request, callback) {
if(!filterPredicate(request)) return callback();
var cacheId = getCacheId(request, withContext);
var cacheEntry = cache[cacheId];
if(cacheEntry) {
return callback(null, cacheEntry);
}
resolver.doResolve(target, request, null, createInnerCallback(function(err, result) {
if(err) return callback(err);
if(result) return callback(null, cache[cacheId] = result);
callback();
}, callback));
});
};
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