294 lines
8.2 KiB
JavaScript
294 lines
8.2 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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"use strict";
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const LazySet = require("../util/LazySet");
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const makeSerializable = require("../util/makeSerializable");
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/** @typedef {import("enhanced-resolve/lib/Resolver")} Resolver */
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/** @typedef {import("../CacheFacade").ItemCacheFacade} ItemCacheFacade */
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/** @typedef {import("../Compiler")} Compiler */
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/** @typedef {import("../FileSystemInfo")} FileSystemInfo */
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/** @typedef {import("../FileSystemInfo").Snapshot} Snapshot */
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class CacheEntry {
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constructor(result, snapshot) {
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this.result = result;
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this.snapshot = snapshot;
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}
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serialize({ write }) {
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write(this.result);
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write(this.snapshot);
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}
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deserialize({ read }) {
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this.result = read();
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this.snapshot = read();
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}
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}
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makeSerializable(CacheEntry, "webpack/lib/cache/ResolverCachePlugin");
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/**
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* @template T
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* @param {Set<T> | LazySet<T>} set set to add items to
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* @param {Set<T> | LazySet<T>} otherSet set to add items from
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* @returns {void}
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*/
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const addAllToSet = (set, otherSet) => {
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if (set instanceof LazySet) {
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set.addAll(otherSet);
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} else {
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for (const item of otherSet) {
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set.add(item);
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}
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}
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};
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/**
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* @param {Object} object an object
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* @param {boolean} excludeContext if true, context is not included in string
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* @returns {string} stringified version
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*/
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const objectToString = (object, excludeContext) => {
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let str = "";
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for (const key in object) {
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if (excludeContext && key === "context") continue;
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const value = object[key];
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if (typeof value === "object" && value !== null) {
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str += `|${key}=[${objectToString(value, false)}|]`;
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} else {
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str += `|${key}=|${value}`;
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}
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}
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return str;
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};
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class ResolverCachePlugin {
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/**
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* Apply the plugin
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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const cache = compiler.getCache("ResolverCachePlugin");
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/** @type {FileSystemInfo} */
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let fileSystemInfo;
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let snapshotOptions;
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let realResolves = 0;
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let cachedResolves = 0;
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let cacheInvalidResolves = 0;
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let concurrentResolves = 0;
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compiler.hooks.thisCompilation.tap("ResolverCachePlugin", compilation => {
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snapshotOptions = compilation.options.snapshot.resolve;
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fileSystemInfo = compilation.fileSystemInfo;
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compilation.hooks.finishModules.tap("ResolverCachePlugin", () => {
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if (realResolves + cachedResolves > 0) {
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const logger = compilation.getLogger("webpack.ResolverCachePlugin");
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logger.log(
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`${Math.round(
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(100 * realResolves) / (realResolves + cachedResolves)
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)}% really resolved (${realResolves} real resolves with ${cacheInvalidResolves} cached but invalid, ${cachedResolves} cached valid, ${concurrentResolves} concurrent)`
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);
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realResolves = 0;
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cachedResolves = 0;
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cacheInvalidResolves = 0;
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concurrentResolves = 0;
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}
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});
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});
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/**
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* @param {ItemCacheFacade} itemCache cache
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* @param {Resolver} resolver the resolver
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* @param {Object} resolveContext context for resolving meta info
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* @param {Object} request the request info object
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* @param {function(Error=, Object=): void} callback callback function
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* @returns {void}
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*/
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const doRealResolve = (
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itemCache,
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resolver,
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resolveContext,
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request,
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callback
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) => {
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realResolves++;
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const newRequest = {
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_ResolverCachePluginCacheMiss: true,
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...request
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};
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const newResolveContext = {
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...resolveContext,
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stack: new Set(),
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missingDependencies: new LazySet(),
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fileDependencies: new LazySet(),
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contextDependencies: new LazySet()
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};
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const propagate = key => {
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if (resolveContext[key]) {
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addAllToSet(resolveContext[key], newResolveContext[key]);
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}
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};
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const resolveTime = Date.now();
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resolver.doResolve(
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resolver.hooks.resolve,
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newRequest,
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"Cache miss",
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newResolveContext,
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(err, result) => {
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propagate("fileDependencies");
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propagate("contextDependencies");
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propagate("missingDependencies");
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if (err) return callback(err);
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const fileDependencies = newResolveContext.fileDependencies;
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const contextDependencies = newResolveContext.contextDependencies;
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const missingDependencies = newResolveContext.missingDependencies;
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fileSystemInfo.createSnapshot(
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resolveTime,
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fileDependencies,
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contextDependencies,
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missingDependencies,
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snapshotOptions,
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(err, snapshot) => {
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if (err) return callback(err);
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if (!snapshot) {
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if (result) return callback(null, result);
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return callback();
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}
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itemCache.store(new CacheEntry(result, snapshot), storeErr => {
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if (storeErr) return callback(storeErr);
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if (result) return callback(null, result);
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callback();
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});
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}
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);
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}
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);
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};
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compiler.resolverFactory.hooks.resolver.intercept({
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factory(type, hook) {
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/** @type {Map<string, (function(Error=, Object=): void)[]>} */
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const activeRequests = new Map();
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hook.tap(
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"ResolverCachePlugin",
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/**
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* @param {Resolver} resolver the resolver
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* @param {Object} options resolve options
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* @param {Object} userOptions resolve options passed by the user
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* @returns {void}
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*/
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(resolver, options, userOptions) => {
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if (options.cache !== true) return;
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const optionsIdent = objectToString(userOptions, false);
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const cacheWithContext =
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options.cacheWithContext !== undefined
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? options.cacheWithContext
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: false;
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resolver.hooks.resolve.tapAsync(
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{
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name: "ResolverCachePlugin",
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stage: -100
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},
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(request, resolveContext, callback) => {
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if (request._ResolverCachePluginCacheMiss || !fileSystemInfo) {
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return callback();
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}
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const identifier = `${type}${optionsIdent}${objectToString(
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request,
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!cacheWithContext
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)}`;
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const activeRequest = activeRequests.get(identifier);
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if (activeRequest) {
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activeRequest.push(callback);
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return;
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}
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const itemCache = cache.getItemCache(identifier, null);
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let callbacks;
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const done = (err, result) => {
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if (callbacks === undefined) {
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callback(err, result);
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callbacks = false;
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} else {
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for (const callback of callbacks) {
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callback(err, result);
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}
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activeRequests.delete(identifier);
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callbacks = false;
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}
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};
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/**
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* @param {Error=} err error if any
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* @param {CacheEntry=} cacheEntry cache entry
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* @returns {void}
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*/
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const processCacheResult = (err, cacheEntry) => {
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if (err) return done(err);
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if (cacheEntry) {
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const { snapshot, result } = cacheEntry;
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fileSystemInfo.checkSnapshotValid(
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snapshot,
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(err, valid) => {
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if (err || !valid) {
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cacheInvalidResolves++;
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return doRealResolve(
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itemCache,
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resolver,
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resolveContext,
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request,
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done
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);
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}
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cachedResolves++;
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if (resolveContext.missingDependencies) {
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addAllToSet(
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resolveContext.missingDependencies,
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snapshot.getMissingIterable()
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);
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}
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if (resolveContext.fileDependencies) {
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addAllToSet(
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resolveContext.fileDependencies,
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snapshot.getFileIterable()
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);
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}
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if (resolveContext.contextDependencies) {
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addAllToSet(
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resolveContext.contextDependencies,
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snapshot.getContextIterable()
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);
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}
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done(null, result);
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}
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);
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} else {
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doRealResolve(
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itemCache,
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resolver,
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resolveContext,
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request,
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done
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);
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}
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};
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itemCache.get(processCacheResult);
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if (callbacks === undefined) {
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callbacks = [callback];
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activeRequests.set(identifier, callbacks);
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}
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}
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);
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}
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);
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return hook;
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}
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});
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}
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}
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module.exports = ResolverCachePlugin;
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