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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
// eslint-disable-next-line n/prefer-global/process
const { nextTick } = require("process");
/** @typedef {import("./Resolver").FileSystem} FileSystem */
/** @typedef {import("./Resolver").PathLike} PathLike */
/** @typedef {import("./Resolver").PathOrFileDescriptor} PathOrFileDescriptor */
/** @typedef {import("./Resolver").SyncFileSystem} SyncFileSystem */
/** @typedef {FileSystem & SyncFileSystem} BaseFileSystem */
/**
* @template T
* @typedef {import("./Resolver").FileSystemCallback<T>} FileSystemCallback<T>
*/
/**
* @param {string} path path
* @returns {string} dirname
*/
const dirname = (path) => {
let idx = path.length - 1;
while (idx >= 0) {
const char = path.charCodeAt(idx);
// slash or backslash
if (char === 47 || char === 92) break;
idx--;
}
if (idx < 0) return "";
return path.slice(0, idx);
};
/**
* @template T
* @param {FileSystemCallback<T>[]} callbacks callbacks
* @param {Error | null} err error
* @param {T} result result
*/
const runCallbacks = (callbacks, err, result) => {
if (callbacks.length === 1) {
callbacks[0](err, result);
callbacks.length = 0;
return;
}
let error;
for (const callback of callbacks) {
try {
callback(err, result);
} catch (err) {
if (!error) error = err;
}
}
callbacks.length = 0;
if (error) throw error;
};
// eslint-disable-next-line jsdoc/reject-function-type
/** @typedef {Function} EXPECTED_FUNCTION */
// eslint-disable-next-line jsdoc/reject-any-type
/** @typedef {any} EXPECTED_ANY */
class OperationMergerBackend {
/**
* @param {EXPECTED_FUNCTION | undefined} provider async method in filesystem
* @param {EXPECTED_FUNCTION | undefined} syncProvider sync method in filesystem
* @param {BaseFileSystem} providerContext call context for the provider methods
*/
constructor(provider, syncProvider, providerContext) {
this._provider = provider;
this._syncProvider = syncProvider;
this._providerContext = providerContext;
this._activeAsyncOperations = new Map();
this.provide = this._provider
? // Comment to align jsdoc
/**
* @param {PathLike | PathOrFileDescriptor} path path
* @param {object | FileSystemCallback<EXPECTED_ANY> | undefined} options options
* @param {FileSystemCallback<EXPECTED_ANY>=} callback callback
* @returns {EXPECTED_ANY} result
*/
(path, options, callback) => {
if (typeof options === "function") {
callback =
/** @type {FileSystemCallback<EXPECTED_ANY>} */
(options);
options = undefined;
}
if (
typeof path !== "string" &&
!Buffer.isBuffer(path) &&
!(path instanceof URL) &&
typeof path !== "number"
) {
/** @type {EXPECTED_FUNCTION} */
(callback)(
new TypeError("path must be a string, Buffer, URL or number"),
);
return;
}
if (options) {
return /** @type {EXPECTED_FUNCTION} */ (this._provider).call(
this._providerContext,
path,
options,
callback,
);
}
let callbacks = this._activeAsyncOperations.get(path);
if (callbacks) {
callbacks.push(callback);
return;
}
this._activeAsyncOperations.set(path, (callbacks = [callback]));
/** @type {EXPECTED_FUNCTION} */
(provider)(
path,
/**
* @param {Error} err error
* @param {EXPECTED_ANY} result result
*/
(err, result) => {
this._activeAsyncOperations.delete(path);
runCallbacks(callbacks, err, result);
},
);
}
: null;
this.provideSync = this._syncProvider
? // Comment to align jsdoc
/**
* @param {PathLike | PathOrFileDescriptor} path path
* @param {object=} options options
* @returns {EXPECTED_ANY} result
*/
(path, options) =>
/** @type {EXPECTED_FUNCTION} */ (this._syncProvider).call(
this._providerContext,
path,
options,
)
: null;
}
purge() {}
purgeParent() {}
}
/*
IDLE:
insert data: goto SYNC
SYNC:
before provide: run ticks
event loop tick: goto ASYNC_ACTIVE
ASYNC:
timeout: run tick, goto ASYNC_PASSIVE
ASYNC_PASSIVE:
before provide: run ticks
IDLE --[insert data]--> SYNC --[event loop tick]--> ASYNC_ACTIVE --[interval tick]-> ASYNC_PASSIVE
^ |
+---------[insert data]-------+
*/
const STORAGE_MODE_IDLE = 0;
const STORAGE_MODE_SYNC = 1;
const STORAGE_MODE_ASYNC = 2;
/**
* @callback Provide
* @param {PathLike | PathOrFileDescriptor} path path
* @param {EXPECTED_ANY} options options
* @param {FileSystemCallback<EXPECTED_ANY>} callback callback
* @returns {void}
*/
class CacheBackend {
/**
* @param {number} duration max cache duration of items
* @param {EXPECTED_FUNCTION | undefined} provider async method
* @param {EXPECTED_FUNCTION | undefined} syncProvider sync method
* @param {BaseFileSystem} providerContext call context for the provider methods
*/
constructor(duration, provider, syncProvider, providerContext) {
this._duration = duration;
this._provider = provider;
this._syncProvider = syncProvider;
this._providerContext = providerContext;
/** @type {Map<string, FileSystemCallback<EXPECTED_ANY>[]>} */
this._activeAsyncOperations = new Map();
/** @type {Map<string, { err: Error | null, result?: EXPECTED_ANY, level: Set<string> }>} */
this._data = new Map();
/** @type {Set<string>[]} */
this._levels = [];
for (let i = 0; i < 10; i++) this._levels.push(new Set());
if (duration !== Infinity) {
for (let i = 5000; i < duration; i += 500) {
this._levels.push(new Set());
}
}
this._currentLevel = 0;
this._tickInterval = Math.floor(duration / this._levels.length);
/** @type {STORAGE_MODE_IDLE | STORAGE_MODE_SYNC | STORAGE_MODE_ASYNC} */
this._mode = STORAGE_MODE_IDLE;
/** @type {NodeJS.Timeout | undefined} */
this._timeout = undefined;
/** @type {number | undefined} */
this._nextDecay = undefined;
// eslint-disable-next-line no-warning-comments
// @ts-ignore
this.provide = provider ? this.provide.bind(this) : null;
// eslint-disable-next-line no-warning-comments
// @ts-ignore
this.provideSync = syncProvider ? this.provideSync.bind(this) : null;
}
/**
* @param {PathLike | PathOrFileDescriptor} path path
* @param {EXPECTED_ANY} options options
* @param {FileSystemCallback<EXPECTED_ANY>} callback callback
* @returns {void}
*/
provide(path, options, callback) {
if (typeof options === "function") {
callback = options;
options = undefined;
}
if (
typeof path !== "string" &&
!Buffer.isBuffer(path) &&
!(path instanceof URL) &&
typeof path !== "number"
) {
callback(new TypeError("path must be a string, Buffer, URL or number"));
return;
}
const strPath = typeof path !== "string" ? path.toString() : path;
if (options) {
return /** @type {EXPECTED_FUNCTION} */ (this._provider).call(
this._providerContext,
path,
options,
callback,
);
}
// When in sync mode we can move to async mode
if (this._mode === STORAGE_MODE_SYNC) {
this._enterAsyncMode();
}
// Check in cache
const cacheEntry = this._data.get(strPath);
if (cacheEntry !== undefined) {
if (cacheEntry.err) return nextTick(callback, cacheEntry.err);
return nextTick(callback, null, cacheEntry.result);
}
// Check if there is already the same operation running
let callbacks = this._activeAsyncOperations.get(strPath);
if (callbacks !== undefined) {
callbacks.push(callback);
return;
}
this._activeAsyncOperations.set(strPath, (callbacks = [callback]));
// Run the operation
/** @type {EXPECTED_FUNCTION} */
(this._provider).call(
this._providerContext,
path,
/**
* @param {Error | null} err error
* @param {EXPECTED_ANY=} result result
*/
(err, result) => {
this._activeAsyncOperations.delete(strPath);
this._storeResult(strPath, err, result);
// Enter async mode if not yet done
this._enterAsyncMode();
runCallbacks(
/** @type {FileSystemCallback<EXPECTED_ANY>[]} */ (callbacks),
err,
result,
);
},
);
}
/**
* @param {PathLike | PathOrFileDescriptor} path path
* @param {EXPECTED_ANY} options options
* @returns {EXPECTED_ANY} result
*/
provideSync(path, options) {
if (
typeof path !== "string" &&
!Buffer.isBuffer(path) &&
!(path instanceof URL) &&
typeof path !== "number"
) {
throw new TypeError("path must be a string");
}
const strPath = typeof path !== "string" ? path.toString() : path;
if (options) {
return /** @type {EXPECTED_FUNCTION} */ (this._syncProvider).call(
this._providerContext,
path,
options,
);
}
// In sync mode we may have to decay some cache items
if (this._mode === STORAGE_MODE_SYNC) {
this._runDecays();
}
// Check in cache
const cacheEntry = this._data.get(strPath);
if (cacheEntry !== undefined) {
if (cacheEntry.err) throw cacheEntry.err;
return cacheEntry.result;
}
// Get all active async operations
// This sync operation will also complete them
const callbacks = this._activeAsyncOperations.get(strPath);
this._activeAsyncOperations.delete(strPath);
// Run the operation
// When in idle mode, we will enter sync mode
let result;
try {
result = /** @type {EXPECTED_FUNCTION} */ (this._syncProvider).call(
this._providerContext,
path,
);
} catch (err) {
this._storeResult(strPath, /** @type {Error} */ (err), undefined);
this._enterSyncModeWhenIdle();
if (callbacks) {
runCallbacks(callbacks, /** @type {Error} */ (err), undefined);
}
throw err;
}
this._storeResult(strPath, null, result);
this._enterSyncModeWhenIdle();
if (callbacks) {
runCallbacks(callbacks, null, result);
}
return result;
}
/**
* @param {(string | Buffer | URL | number | (string | URL | Buffer | number)[] | Set<string | URL | Buffer | number>)=} what what to purge
*/
purge(what) {
if (!what) {
if (this._mode !== STORAGE_MODE_IDLE) {
this._data.clear();
for (const level of this._levels) {
level.clear();
}
this._enterIdleMode();
}
} else if (
typeof what === "string" ||
Buffer.isBuffer(what) ||
what instanceof URL ||
typeof what === "number"
) {
const strWhat = typeof what !== "string" ? what.toString() : what;
for (const [key, data] of this._data) {
if (key.startsWith(strWhat)) {
this._data.delete(key);
data.level.delete(key);
}
}
if (this._data.size === 0) {
this._enterIdleMode();
}
} else {
for (const [key, data] of this._data) {
for (const item of what) {
const strItem = typeof item !== "string" ? item.toString() : item;
if (key.startsWith(strItem)) {
this._data.delete(key);
data.level.delete(key);
break;
}
}
}
if (this._data.size === 0) {
this._enterIdleMode();
}
}
}
/**
* @param {(string | Buffer | URL | number | (string | URL | Buffer | number)[] | Set<string | URL | Buffer | number>)=} what what to purge
*/
purgeParent(what) {
if (!what) {
this.purge();
} else if (
typeof what === "string" ||
Buffer.isBuffer(what) ||
what instanceof URL ||
typeof what === "number"
) {
const strWhat = typeof what !== "string" ? what.toString() : what;
this.purge(dirname(strWhat));
} else {
const set = new Set();
for (const item of what) {
const strItem = typeof item !== "string" ? item.toString() : item;
set.add(dirname(strItem));
}
this.purge(set);
}
}
/**
* @param {string} path path
* @param {Error | null} err error
* @param {EXPECTED_ANY} result result
*/
_storeResult(path, err, result) {
if (this._data.has(path)) return;
const level = this._levels[this._currentLevel];
this._data.set(path, { err, result, level });
level.add(path);
}
_decayLevel() {
const nextLevel = (this._currentLevel + 1) % this._levels.length;
const decay = this._levels[nextLevel];
this._currentLevel = nextLevel;
for (const item of decay) {
this._data.delete(item);
}
decay.clear();
if (this._data.size === 0) {
this._enterIdleMode();
} else {
/** @type {number} */
(this._nextDecay) += this._tickInterval;
}
}
_runDecays() {
while (
/** @type {number} */ (this._nextDecay) <= Date.now() &&
this._mode !== STORAGE_MODE_IDLE
) {
this._decayLevel();
}
}
_enterAsyncMode() {
let timeout = 0;
switch (this._mode) {
case STORAGE_MODE_ASYNC:
return;
case STORAGE_MODE_IDLE:
this._nextDecay = Date.now() + this._tickInterval;
timeout = this._tickInterval;
break;
case STORAGE_MODE_SYNC:
this._runDecays();
// _runDecays may change the mode
if (
/** @type {STORAGE_MODE_IDLE | STORAGE_MODE_SYNC | STORAGE_MODE_ASYNC} */
(this._mode) === STORAGE_MODE_IDLE
) {
return;
}
timeout = Math.max(
0,
/** @type {number} */ (this._nextDecay) - Date.now(),
);
break;
}
this._mode = STORAGE_MODE_ASYNC;
// When duration is Infinity, cache entries never expire, so there
// is no need to schedule a decay timer.
if (this._duration === Infinity) {
return;
}
const ref = setTimeout(() => {
this._mode = STORAGE_MODE_SYNC;
this._runDecays();
}, timeout);
if (ref.unref) ref.unref();
this._timeout = ref;
}
_enterSyncModeWhenIdle() {
if (this._mode === STORAGE_MODE_IDLE) {
this._mode = STORAGE_MODE_SYNC;
this._nextDecay = Date.now() + this._tickInterval;
}
}
_enterIdleMode() {
this._mode = STORAGE_MODE_IDLE;
this._nextDecay = undefined;
if (this._timeout) clearTimeout(this._timeout);
}
}
/**
* @template {EXPECTED_FUNCTION} Provider
* @template {EXPECTED_FUNCTION} AsyncProvider
* @template FileSystem
* @param {number} duration duration in ms files are cached
* @param {Provider | undefined} provider provider
* @param {AsyncProvider | undefined} syncProvider sync provider
* @param {BaseFileSystem} providerContext provider context
* @returns {OperationMergerBackend | CacheBackend} backend
*/
const createBackend = (duration, provider, syncProvider, providerContext) => {
if (duration > 0) {
return new CacheBackend(duration, provider, syncProvider, providerContext);
}
return new OperationMergerBackend(provider, syncProvider, providerContext);
};
module.exports = class CachedInputFileSystem {
/**
* @param {BaseFileSystem} fileSystem file system
* @param {number} duration duration in ms files are cached
*/
constructor(fileSystem, duration) {
this.fileSystem = fileSystem;
this._lstatBackend = createBackend(
duration,
this.fileSystem.lstat,
this.fileSystem.lstatSync,
this.fileSystem,
);
const lstat = this._lstatBackend.provide;
this.lstat = /** @type {FileSystem["lstat"]} */ (lstat);
const lstatSync = this._lstatBackend.provideSync;
this.lstatSync = /** @type {SyncFileSystem["lstatSync"]} */ (lstatSync);
this._statBackend = createBackend(
duration,
this.fileSystem.stat,
this.fileSystem.statSync,
this.fileSystem,
);
const stat = this._statBackend.provide;
this.stat = /** @type {FileSystem["stat"]} */ (stat);
const statSync = this._statBackend.provideSync;
this.statSync = /** @type {SyncFileSystem["statSync"]} */ (statSync);
this._readdirBackend = createBackend(
duration,
this.fileSystem.readdir,
this.fileSystem.readdirSync,
this.fileSystem,
);
const readdir = this._readdirBackend.provide;
this.readdir = /** @type {FileSystem["readdir"]} */ (readdir);
const readdirSync = this._readdirBackend.provideSync;
this.readdirSync = /** @type {SyncFileSystem["readdirSync"]} */ (
readdirSync
);
this._readFileBackend = createBackend(
duration,
this.fileSystem.readFile,
this.fileSystem.readFileSync,
this.fileSystem,
);
const readFile = this._readFileBackend.provide;
this.readFile = /** @type {FileSystem["readFile"]} */ (readFile);
const readFileSync = this._readFileBackend.provideSync;
this.readFileSync = /** @type {SyncFileSystem["readFileSync"]} */ (
readFileSync
);
this._readJsonBackend = createBackend(
duration,
// prettier-ignore
this.fileSystem.readJson ||
(this.readFile &&
(
/**
* @param {string} path path
* @param {FileSystemCallback<EXPECTED_ANY>} callback callback
*/
(path, callback) => {
this.readFile(path, (err, buffer) => {
if (err) return callback(err);
if (!buffer || buffer.length === 0)
{return callback(new Error("No file content"));}
let data;
try {
data = JSON.parse(buffer.toString("utf8"));
} catch (err_) {
return callback(/** @type {Error} */ (err_));
}
callback(null, data);
});
})
),
// prettier-ignore
this.fileSystem.readJsonSync ||
(this.readFileSync &&
(
/**
* @param {string} path path
* @returns {EXPECTED_ANY} result
*/
(path) => {
const buffer = this.readFileSync(path);
const data = JSON.parse(buffer.toString("utf8"));
return data;
}
)),
this.fileSystem,
);
const readJson = this._readJsonBackend.provide;
this.readJson = /** @type {FileSystem["readJson"]} */ (readJson);
const readJsonSync = this._readJsonBackend.provideSync;
this.readJsonSync = /** @type {SyncFileSystem["readJsonSync"]} */ (
readJsonSync
);
this._readlinkBackend = createBackend(
duration,
this.fileSystem.readlink,
this.fileSystem.readlinkSync,
this.fileSystem,
);
const readlink = this._readlinkBackend.provide;
this.readlink = /** @type {FileSystem["readlink"]} */ (readlink);
const readlinkSync = this._readlinkBackend.provideSync;
this.readlinkSync = /** @type {SyncFileSystem["readlinkSync"]} */ (
readlinkSync
);
this._realpathBackend = createBackend(
duration,
this.fileSystem.realpath,
this.fileSystem.realpathSync,
this.fileSystem,
);
const realpath = this._realpathBackend.provide;
this.realpath = /** @type {FileSystem["realpath"]} */ (realpath);
const realpathSync = this._realpathBackend.provideSync;
this.realpathSync = /** @type {SyncFileSystem["realpathSync"]} */ (
realpathSync
);
}
/**
* @param {(string | Buffer | URL | number | (string | URL | Buffer | number)[] | Set<string | URL | Buffer | number>)=} what what to purge
*/
purge(what) {
this._statBackend.purge(what);
this._lstatBackend.purge(what);
this._readdirBackend.purgeParent(what);
this._readFileBackend.purge(what);
this._readlinkBackend.purge(what);
this._readJsonBackend.purge(what);
this._realpathBackend.purge(what);
}
};