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