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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
/** @typedef {{[k: string]: any}} Cache */
function getCacheId(request, withContext) {
return JSON.stringify({
context: withContext ? request.context : "",
path: request.path,
query: request.query,
fragment: request.fragment,
request: request.request
});
}
module.exports = class UnsafeCachePlugin {
/**
* @param {string | ResolveStepHook} source source
* @param {function(ResolveRequest): boolean} filterPredicate filterPredicate
* @param {Cache} cache cache
* @param {boolean} withContext withContext
* @param {string | ResolveStepHook} target target
*/
constructor(source, filterPredicate, cache, withContext, target) {
this.source = source;
this.filterPredicate = filterPredicate;
this.withContext = withContext;
this.cache = cache;
this.target = target;
}
/**
* @param {Resolver} resolver the resolver
* @returns {void}
*/
apply(resolver) {
const target = resolver.ensureHook(this.target);
resolver
.getHook(this.source)
.tapAsync("UnsafeCachePlugin", (request, resolveContext, callback) => {
if (!this.filterPredicate(request)) return callback();
const cacheId = getCacheId(request, this.withContext);
const cacheEntry = this.cache[cacheId];
if (cacheEntry) {
return callback(null, cacheEntry);
}
resolver.doResolve(
target,
request,
null,
resolveContext,
(err, result) => {
if (err) return callback(err);
if (result) return callback(null, (this.cache[cacheId] = result));
callback();
}
);
});
}
};
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