478 lines
13 KiB
JavaScript
478 lines
13 KiB
JavaScript
/*
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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 nextTick = require("process").nextTick;
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/** @typedef {import("./Resolver").FileSystem} FileSystem */
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/** @typedef {import("./Resolver").SyncFileSystem} SyncFileSystem */
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const dirname = path => {
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let idx = path.length - 1;
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while (idx >= 0) {
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const c = path.charCodeAt(idx);
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// slash or backslash
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if (c === 47 || c === 92) break;
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idx--;
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}
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if (idx < 0) return "";
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return path.slice(0, idx);
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};
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const runCallbacks = (callbacks, err, result) => {
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if (callbacks.length === 1) {
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callbacks[0](err, result);
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callbacks.length = 0;
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return;
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}
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let error;
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for (const callback of callbacks) {
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try {
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callback(err, result);
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} catch (e) {
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if (!error) error = e;
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}
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}
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callbacks.length = 0;
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if (error) throw error;
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};
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class OperationMergerBackend {
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/**
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* @param {any} provider async method
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* @param {any} syncProvider sync method
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* @param {any} providerContext call context for the provider methods
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*/
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constructor(provider, syncProvider, providerContext) {
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this._provider = provider;
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this._syncProvider = syncProvider;
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this._providerContext = providerContext;
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this._activeAsyncOperations = new Map();
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this.provide = this._provider
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? (path, options, callback) => {
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if (typeof options === "function") {
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callback = options;
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options = undefined;
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}
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if (options) {
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return this._provider.call(
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this._providerContext,
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path,
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options,
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callback
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);
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}
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if (typeof path !== "string") {
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callback(new TypeError("path must be a string"));
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return;
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}
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let callbacks = this._activeAsyncOperations.get(path);
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if (callbacks) {
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callbacks.push(callback);
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return;
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}
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this._activeAsyncOperations.set(path, (callbacks = [callback]));
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provider(path, (err, result) => {
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this._activeAsyncOperations.delete(path);
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runCallbacks(callbacks, err, result);
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});
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}
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: null;
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this.provideSync = this._syncProvider
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? (path, options) => {
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return this._syncProvider.call(this._providerContext, path, options);
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}
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: null;
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}
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purge() {}
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purgeParent() {}
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}
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/*
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IDLE:
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insert data: goto SYNC
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SYNC:
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before provide: run ticks
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event loop tick: goto ASYNC_ACTIVE
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ASYNC:
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timeout: run tick, goto ASYNC_PASSIVE
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ASYNC_PASSIVE:
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before provide: run ticks
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IDLE --[insert data]--> SYNC --[event loop tick]--> ASYNC_ACTIVE --[interval tick]-> ASYNC_PASSIVE
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^ |
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+---------[insert data]-------+
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*/
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const STORAGE_MODE_IDLE = 0;
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const STORAGE_MODE_SYNC = 1;
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const STORAGE_MODE_ASYNC = 2;
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class CacheBackend {
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/**
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* @param {number} duration max cache duration of items
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* @param {any} provider async method
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* @param {any} syncProvider sync method
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* @param {any} providerContext call context for the provider methods
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*/
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constructor(duration, provider, syncProvider, providerContext) {
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this._duration = duration;
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this._provider = provider;
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this._syncProvider = syncProvider;
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this._providerContext = providerContext;
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/** @type {Map<string, (function(Error, any): void)[]>} */
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this._activeAsyncOperations = new Map();
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/** @type {Map<string, { err: Error, result: any, level: Set<string> }>} */
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this._data = new Map();
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/** @type {Set<string>[]} */
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this._levels = [];
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for (let i = 0; i < 10; i++) this._levels.push(new Set());
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for (let i = 5000; i < duration; i += 500) this._levels.push(new Set());
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this._currentLevel = 0;
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this._tickInterval = Math.floor(duration / this._levels.length);
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/** @type {STORAGE_MODE_IDLE | STORAGE_MODE_SYNC | STORAGE_MODE_ASYNC} */
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this._mode = STORAGE_MODE_IDLE;
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/** @type {NodeJS.Timeout | undefined} */
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this._timeout = undefined;
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/** @type {number | undefined} */
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this._nextDecay = undefined;
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this.provide = provider ? this.provide.bind(this) : null;
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this.provideSync = syncProvider ? this.provideSync.bind(this) : null;
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}
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provide(path, options, callback) {
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if (typeof options === "function") {
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callback = options;
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options = undefined;
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}
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if (typeof path !== "string") {
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callback(new TypeError("path must be a string"));
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return;
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}
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if (options) {
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return this._provider.call(
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this._providerContext,
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path,
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options,
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callback
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);
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}
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// When in sync mode we can move to async mode
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if (this._mode === STORAGE_MODE_SYNC) {
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this._enterAsyncMode();
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}
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// Check in cache
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let cacheEntry = this._data.get(path);
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if (cacheEntry !== undefined) {
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if (cacheEntry.err) return nextTick(callback, cacheEntry.err);
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return nextTick(callback, null, cacheEntry.result);
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}
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// Check if there is already the same operation running
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let callbacks = this._activeAsyncOperations.get(path);
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if (callbacks !== undefined) {
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callbacks.push(callback);
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return;
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}
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this._activeAsyncOperations.set(path, (callbacks = [callback]));
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// Run the operation
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this._provider.call(this._providerContext, path, (err, result) => {
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this._activeAsyncOperations.delete(path);
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this._storeResult(path, err, result);
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// Enter async mode if not yet done
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this._enterAsyncMode();
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runCallbacks(callbacks, err, result);
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});
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}
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provideSync(path, options) {
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if (typeof path !== "string") {
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throw new TypeError("path must be a string");
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}
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if (options) {
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return this._syncProvider.call(this._providerContext, path, options);
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}
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// In sync mode we may have to decay some cache items
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if (this._mode === STORAGE_MODE_SYNC) {
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this._runDecays();
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}
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// Check in cache
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let cacheEntry = this._data.get(path);
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if (cacheEntry !== undefined) {
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if (cacheEntry.err) throw cacheEntry.err;
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return cacheEntry.result;
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}
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// Get all active async operations
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// This sync operation will also complete them
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const callbacks = this._activeAsyncOperations.get(path);
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this._activeAsyncOperations.delete(path);
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// Run the operation
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// When in idle mode, we will enter sync mode
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let result;
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try {
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result = this._syncProvider.call(this._providerContext, path);
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} catch (err) {
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this._storeResult(path, err, undefined);
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this._enterSyncModeWhenIdle();
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if (callbacks) runCallbacks(callbacks, err, undefined);
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throw err;
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}
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this._storeResult(path, undefined, result);
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this._enterSyncModeWhenIdle();
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if (callbacks) runCallbacks(callbacks, undefined, result);
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return result;
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}
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purge(what) {
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if (!what) {
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if (this._mode !== STORAGE_MODE_IDLE) {
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this._data.clear();
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for (const level of this._levels) {
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level.clear();
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}
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this._enterIdleMode();
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}
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} else if (typeof what === "string") {
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for (let [key, data] of this._data) {
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if (key.startsWith(what)) {
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this._data.delete(key);
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data.level.delete(key);
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}
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}
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if (this._data.size === 0) {
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this._enterIdleMode();
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}
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} else {
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for (let [key, data] of this._data) {
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for (const item of what) {
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if (key.startsWith(item)) {
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this._data.delete(key);
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data.level.delete(key);
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break;
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}
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}
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}
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if (this._data.size === 0) {
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this._enterIdleMode();
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}
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}
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}
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purgeParent(what) {
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if (!what) {
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this.purge();
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} else if (typeof what === "string") {
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this.purge(dirname(what));
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} else {
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const set = new Set();
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for (const item of what) {
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set.add(dirname(item));
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}
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this.purge(set);
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}
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}
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_storeResult(path, err, result) {
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if (this._data.has(path)) return;
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const level = this._levels[this._currentLevel];
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this._data.set(path, { err, result, level });
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level.add(path);
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}
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_decayLevel() {
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const nextLevel = (this._currentLevel + 1) % this._levels.length;
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const decay = this._levels[nextLevel];
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this._currentLevel = nextLevel;
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for (let item of decay) {
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this._data.delete(item);
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}
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decay.clear();
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if (this._data.size === 0) {
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this._enterIdleMode();
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} else {
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// @ts-ignore _nextDecay is always a number in sync mode
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this._nextDecay += this._tickInterval;
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}
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}
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_runDecays() {
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while (
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/** @type {number} */ (this._nextDecay) <= Date.now() &&
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this._mode !== STORAGE_MODE_IDLE
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) {
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this._decayLevel();
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}
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}
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_enterAsyncMode() {
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let timeout = 0;
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switch (this._mode) {
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case STORAGE_MODE_ASYNC:
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return;
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case STORAGE_MODE_IDLE:
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this._nextDecay = Date.now() + this._tickInterval;
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timeout = this._tickInterval;
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break;
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case STORAGE_MODE_SYNC:
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this._runDecays();
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// @ts-ignore _runDecays may change the mode
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if (this._mode === STORAGE_MODE_IDLE) return;
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timeout = Math.max(
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0,
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/** @type {number} */ (this._nextDecay) - Date.now()
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);
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break;
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}
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this._mode = STORAGE_MODE_ASYNC;
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const ref = setTimeout(() => {
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this._mode = STORAGE_MODE_SYNC;
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this._runDecays();
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}, timeout);
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if (ref.unref) ref.unref();
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this._timeout = ref;
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}
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_enterSyncModeWhenIdle() {
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if (this._mode === STORAGE_MODE_IDLE) {
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this._mode = STORAGE_MODE_SYNC;
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this._nextDecay = Date.now() + this._tickInterval;
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}
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}
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_enterIdleMode() {
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this._mode = STORAGE_MODE_IDLE;
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this._nextDecay = undefined;
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if (this._timeout) clearTimeout(this._timeout);
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}
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}
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const createBackend = (duration, provider, syncProvider, providerContext) => {
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if (duration > 0) {
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return new CacheBackend(duration, provider, syncProvider, providerContext);
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}
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return new OperationMergerBackend(provider, syncProvider, providerContext);
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};
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module.exports = class CachedInputFileSystem {
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constructor(fileSystem, duration) {
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this.fileSystem = fileSystem;
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this._lstatBackend = createBackend(
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duration,
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this.fileSystem.lstat,
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this.fileSystem.lstatSync,
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this.fileSystem
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);
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const lstat = this._lstatBackend.provide;
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this.lstat = /** @type {FileSystem["lstat"]} */ (lstat);
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const lstatSync = this._lstatBackend.provideSync;
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this.lstatSync = /** @type {SyncFileSystem["lstatSync"]} */ (lstatSync);
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this._statBackend = createBackend(
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duration,
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this.fileSystem.stat,
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this.fileSystem.statSync,
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this.fileSystem
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);
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const stat = this._statBackend.provide;
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this.stat = /** @type {FileSystem["stat"]} */ (stat);
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const statSync = this._statBackend.provideSync;
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this.statSync = /** @type {SyncFileSystem["statSync"]} */ (statSync);
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this._readdirBackend = createBackend(
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duration,
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this.fileSystem.readdir,
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this.fileSystem.readdirSync,
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this.fileSystem
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);
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const readdir = this._readdirBackend.provide;
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this.readdir = /** @type {FileSystem["readdir"]} */ (readdir);
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const readdirSync = this._readdirBackend.provideSync;
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this.readdirSync = /** @type {SyncFileSystem["readdirSync"]} */ (readdirSync);
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this._readFileBackend = createBackend(
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duration,
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this.fileSystem.readFile,
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this.fileSystem.readFileSync,
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this.fileSystem
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);
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const readFile = this._readFileBackend.provide;
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this.readFile = /** @type {FileSystem["readFile"]} */ (readFile);
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const readFileSync = this._readFileBackend.provideSync;
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this.readFileSync = /** @type {SyncFileSystem["readFileSync"]} */ (readFileSync);
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this._readJsonBackend = createBackend(
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duration,
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this.fileSystem.readJson ||
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(this.readFile &&
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((path, callback) => {
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// @ts-ignore
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this.readFile(path, (err, buffer) => {
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if (err) return callback(err);
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if (!buffer || buffer.length === 0)
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return callback(new Error("No file content"));
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let data;
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try {
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data = JSON.parse(buffer.toString("utf-8"));
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} catch (e) {
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return callback(e);
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}
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callback(null, data);
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});
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})),
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this.fileSystem.readJsonSync ||
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(this.readFileSync &&
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(path => {
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const buffer = this.readFileSync(path);
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const data = JSON.parse(buffer.toString("utf-8"));
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return data;
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})),
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this.fileSystem
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);
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const readJson = this._readJsonBackend.provide;
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this.readJson = /** @type {FileSystem["readJson"]} */ (readJson);
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const readJsonSync = this._readJsonBackend.provideSync;
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this.readJsonSync = /** @type {SyncFileSystem["readJsonSync"]} */ (readJsonSync);
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this._readlinkBackend = createBackend(
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duration,
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this.fileSystem.readlink,
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this.fileSystem.readlinkSync,
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this.fileSystem
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);
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const readlink = this._readlinkBackend.provide;
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this.readlink = /** @type {FileSystem["readlink"]} */ (readlink);
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const readlinkSync = this._readlinkBackend.provideSync;
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this.readlinkSync = /** @type {SyncFileSystem["readlinkSync"]} */ (readlinkSync);
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}
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purge(what) {
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this._statBackend.purge(what);
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this._lstatBackend.purge(what);
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this._readdirBackend.purgeParent(what);
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this._readFileBackend.purge(what);
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this._readlinkBackend.purge(what);
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this._readJsonBackend.purge(what);
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}
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};
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