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ResolverCachePlugin.js
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Thu, Feb 13, 20:37

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

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