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hooks.js
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hooks.js
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'use strict';
const {
ArrayPrototypePush,
FunctionPrototypeCall,
Int32Array,
ObjectAssign,
ObjectDefineProperty,
ObjectSetPrototypeOf,
Promise,
SafeSet,
StringPrototypeSlice,
StringPrototypeToUpperCase,
globalThis,
} = primordials;
const {
Atomics: {
load: AtomicsLoad,
wait: AtomicsWait,
waitAsync: AtomicsWaitAsync,
},
SharedArrayBuffer,
} = globalThis;
const {
ERR_INTERNAL_ASSERTION,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
ERR_INVALID_RETURN_PROPERTY_VALUE,
ERR_INVALID_RETURN_VALUE,
ERR_LOADER_CHAIN_INCOMPLETE,
ERR_WORKER_UNSERIALIZABLE_ERROR,
} = require('internal/errors').codes;
const { exitCodes: { kUnfinishedTopLevelAwait } } = internalBinding('errors');
const { URL } = require('internal/url');
const { canParse: URLCanParse } = internalBinding('url');
const { receiveMessageOnPort } = require('worker_threads');
const {
isAnyArrayBuffer,
isArrayBufferView,
} = require('internal/util/types');
const {
validateObject,
validateString,
} = require('internal/validators');
const {
defaultResolve,
throwIfInvalidParentURL,
} = require('internal/modules/esm/resolve');
const {
getDefaultConditions,
loaderWorkerId,
} = require('internal/modules/esm/utils');
const { deserializeError } = require('internal/error_serdes');
const {
SHARED_MEMORY_BYTE_LENGTH,
WORKER_TO_MAIN_THREAD_NOTIFICATION,
} = require('internal/modules/esm/shared_constants');
let debug = require('internal/util/debuglog').debuglog('esm', (fn) => {
debug = fn;
});
/**
* @typedef {object} KeyedHook
* @property {Function} fn The hook function.
* @property {URL['href']} url The URL of the module.
*/
// [2] `validate...()`s throw the wrong error
class Hooks {
#chains = {
/**
* Prior to ESM loading. These are called once before any modules are started.
* @private
* @property {KeyedHook[]} globalPreload Last-in-first-out list of preload hooks.
*/
globalPreload: [],
/**
* Phase 1 of 2 in ESM loading.
* The output of the `resolve` chain of hooks is passed into the `load` chain of hooks.
* @private
* @property {KeyedHook[]} resolve Last-in-first-out collection of resolve hooks.
*/
resolve: [
{
fn: defaultResolve,
url: 'node:internal/modules/esm/resolve',
},
],
/**
* Phase 2 of 2 in ESM loading.
* @private
* @property {KeyedHook[]} load Last-in-first-out collection of loader hooks.
*/
load: [
{
fn: require('internal/modules/esm/load').defaultLoad,
url: 'node:internal/modules/esm/load',
},
],
};
// Cache URLs we've already validated to avoid repeated validation
#validatedUrls = new SafeSet();
constructor(userLoaders) {
this.addCustomLoaders(userLoaders);
}
/**
* Collect custom/user-defined module loader hook(s).
* After all hooks have been collected, the global preload hook(s) must be initialized.
* @param {import('./loader.js).KeyedExports} customLoaders Exports from user-defined loaders
* (as returned by `ModuleLoader.import()`).
*/
addCustomLoaders(customLoaders = []) {
for (let i = 0; i < customLoaders.length; i++) {
const {
exports,
url,
} = customLoaders[i];
const {
globalPreload,
resolve,
load,
} = pluckHooks(exports);
if (globalPreload) {
ArrayPrototypePush(this.#chains.globalPreload, { fn: globalPreload, url });
}
if (resolve) {
ArrayPrototypePush(this.#chains.resolve, { fn: resolve, url });
}
if (load) {
ArrayPrototypePush(this.#chains.load, { fn: load, url });
}
}
}
/**
* Initialize `globalPreload` hooks.
*/
initializeGlobalPreload() {
const preloadScripts = [];
for (let i = this.#chains.globalPreload.length - 1; i >= 0; i--) {
const { MessageChannel } = require('internal/worker/io');
const channel = new MessageChannel();
const {
port1: insidePreload,
port2: insideLoader,
} = channel;
insidePreload.unref();
insideLoader.unref();
const {
fn: preload,
url: specifier,
} = this.#chains.globalPreload[i];
const preloaded = preload({
port: insideLoader,
});
if (preloaded == null) { return; }
if (typeof preloaded !== 'string') { // [2]
throw new ERR_INVALID_RETURN_VALUE(
'a string',
`${specifier} globalPreload`,
preload,
);
}
ArrayPrototypePush(preloadScripts, {
code: preloaded,
port: insidePreload,
});
}
return preloadScripts;
}
/**
* Resolve the location of the module.
*
* Internally, this behaves like a backwards iterator, wherein the stack of
* hooks starts at the top and each call to `nextResolve()` moves down 1 step
* until it reaches the bottom or short-circuits.
* @param {string} originalSpecifier The specified URL path of the module to
* be resolved.
* @param {string} [parentURL] The URL path of the module's parent.
* @param {ImportAssertions} [importAssertions] Assertions from the import
* statement or expression.
* @returns {Promise<{ format: string, url: URL['href'] }>}
*/
async resolve(
originalSpecifier,
parentURL,
importAssertions = { __proto__: null },
) {
throwIfInvalidParentURL(parentURL);
const chain = this.#chains.resolve;
const context = {
conditions: getDefaultConditions(),
importAssertions,
parentURL,
};
const meta = {
chainFinished: null,
context,
hookErrIdentifier: '',
hookIndex: chain.length - 1,
hookName: 'resolve',
shortCircuited: false,
};
const validateArgs = (hookErrIdentifier, suppliedSpecifier, ctx) => {
validateString(
suppliedSpecifier,
`${hookErrIdentifier} specifier`,
); // non-strings can be coerced to a URL string
if (ctx) validateObject(ctx, `${hookErrIdentifier} context`);
};
const validateOutput = (hookErrIdentifier, output) => {
if (typeof output !== 'object' || output === null) { // [2]
throw new ERR_INVALID_RETURN_VALUE(
'an object',
hookErrIdentifier,
output,
);
}
};
const nextResolve = nextHookFactory(chain, meta, { validateArgs, validateOutput });
const resolution = await nextResolve(originalSpecifier, context);
const { hookErrIdentifier } = meta; // Retrieve the value after all settled
validateOutput(hookErrIdentifier, resolution);
if (resolution?.shortCircuit === true) { meta.shortCircuited = true; }
if (!meta.chainFinished && !meta.shortCircuited) {
throw new ERR_LOADER_CHAIN_INCOMPLETE(hookErrIdentifier);
}
const {
format,
importAssertions: resolvedImportAssertions,
url,
} = resolution;
if (typeof url !== 'string') {
// non-strings can be coerced to a URL string
// validateString() throws a less-specific error
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'a URL string',
hookErrIdentifier,
'url',
url,
);
}
// Avoid expensive URL instantiation for known-good URLs
if (!this.#validatedUrls.has(url)) {
// No need to convert to string, since the type is already validated
if (!URLCanParse(url)) {
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'a URL string',
hookErrIdentifier,
'url',
url,
);
}
this.#validatedUrls.add(url);
}
if (
resolvedImportAssertions != null &&
typeof resolvedImportAssertions !== 'object'
) {
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'an object',
hookErrIdentifier,
'importAssertions',
resolvedImportAssertions,
);
}
if (
format != null &&
typeof format !== 'string' // [2]
) {
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'a string',
hookErrIdentifier,
'format',
format,
);
}
return {
__proto__: null,
format,
importAssertions: resolvedImportAssertions,
url,
};
}
/**
* Provide source that is understood by one of Node's translators.
*
* Internally, this behaves like a backwards iterator, wherein the stack of
* hooks starts at the top and each call to `nextLoad()` moves down 1 step
* until it reaches the bottom or short-circuits.
* @param {URL['href']} url The URL/path of the module to be loaded
* @param {object} context Metadata about the module
* @returns {Promise<{ format: ModuleFormat, source: ModuleSource }>}
*/
async load(url, context = {}) {
const chain = this.#chains.load;
const meta = {
chainFinished: null,
context,
hookErrIdentifier: '',
hookIndex: chain.length - 1,
hookName: 'load',
shortCircuited: false,
};
const validateArgs = (hookErrIdentifier, nextUrl, ctx) => {
if (typeof nextUrl !== 'string') {
// Non-strings can be coerced to a URL string
// validateString() throws a less-specific error
throw new ERR_INVALID_ARG_TYPE(
`${hookErrIdentifier} url`,
'a URL string',
nextUrl,
);
}
// Avoid expensive URL instantiation for known-good URLs
if (!this.#validatedUrls.has(nextUrl)) {
// No need to convert to string, since the type is already validated
if (!URLCanParse(nextUrl)) {
throw new ERR_INVALID_ARG_VALUE(
`${hookErrIdentifier} url`,
nextUrl,
'should be a URL string',
);
}
this.#validatedUrls.add(nextUrl);
}
if (ctx) { validateObject(ctx, `${hookErrIdentifier} context`); }
};
const validateOutput = (hookErrIdentifier, output) => {
if (typeof output !== 'object' || output === null) { // [2]
throw new ERR_INVALID_RETURN_VALUE(
'an object',
hookErrIdentifier,
output,
);
}
};
const nextLoad = nextHookFactory(chain, meta, { validateArgs, validateOutput });
const loaded = await nextLoad(url, context);
const { hookErrIdentifier } = meta; // Retrieve the value after all settled
validateOutput(hookErrIdentifier, loaded);
if (loaded?.shortCircuit === true) { meta.shortCircuited = true; }
if (!meta.chainFinished && !meta.shortCircuited) {
throw new ERR_LOADER_CHAIN_INCOMPLETE(hookErrIdentifier);
}
const {
format,
source,
} = loaded;
let responseURL = loaded.responseURL;
if (responseURL === undefined) {
responseURL = url;
}
let responseURLObj;
if (typeof responseURL === 'string') {
try {
responseURLObj = new URL(responseURL);
} catch {
// responseURLObj not defined will throw in next branch.
}
}
if (responseURLObj?.href !== responseURL) {
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'undefined or a fully resolved URL string',
hookErrIdentifier,
'responseURL',
responseURL,
);
}
if (format == null) {
require('internal/modules/esm/load').throwUnknownModuleFormat(url, format);
}
if (typeof format !== 'string') { // [2]
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'a string',
hookErrIdentifier,
'format',
format,
);
}
if (
source != null &&
typeof source !== 'string' &&
!isAnyArrayBuffer(source) &&
!isArrayBufferView(source)
) {
throw ERR_INVALID_RETURN_PROPERTY_VALUE(
'a string, an ArrayBuffer, or a TypedArray',
hookErrIdentifier,
'source',
source,
);
}
return {
__proto__: null,
format,
responseURL,
source,
};
}
}
ObjectSetPrototypeOf(Hooks.prototype, null);
/**
* There may be multiple instances of Hooks/HooksProxy, but there is only 1 Internal worker, so
* there is only 1 MessageChannel.
*/
let MessageChannel;
class HooksProxy {
/**
* Shared memory. Always use Atomics method to read or write to it.
* @type {Int32Array}
*/
#lock;
/**
* The InternalWorker instance, which lets us communicate with the loader thread.
*/
#worker;
/**
* The last notification ID received from the worker. This is used to detect
* if the worker has already sent a notification before putting the main
* thread to sleep, to avoid a race condition.
* @type {number}
*/
#workerNotificationLastId = 0;
/**
* Track how many async responses the main thread should expect.
* @type {number}
*/
#numberOfPendingAsyncResponses = 0;
#isReady = false;
constructor() {
const { InternalWorker } = require('internal/worker');
MessageChannel ??= require('internal/worker/io').MessageChannel;
const lock = new SharedArrayBuffer(SHARED_MEMORY_BYTE_LENGTH);
this.#lock = new Int32Array(lock);
this.#worker = new InternalWorker(loaderWorkerId, {
stderr: false,
stdin: false,
stdout: false,
trackUnmanagedFds: false,
workerData: {
lock,
},
});
this.#worker.unref(); // ! Allows the process to eventually exit.
this.#worker.on('exit', process.exit);
}
#waitForWorker() {
if (!this.#isReady) {
const { kIsOnline } = require('internal/worker');
if (!this.#worker[kIsOnline]) {
debug('wait for signal from worker');
AtomicsWait(this.#lock, WORKER_TO_MAIN_THREAD_NOTIFICATION, 0);
const response = this.#worker.receiveMessageSync();
if (response.message.status === 'exit') { return; }
const { preloadScripts } = this.#unwrapMessage(response);
this.#executePreloadScripts(preloadScripts);
}
this.#isReady = true;
}
}
#beforeExitHandler = () => {
debug('beforeExit main thread', this.#lock, this.#numberOfPendingAsyncResponses);
if (this.#numberOfPendingAsyncResponses !== 0) {
// The worker still has some work to do, let's wait for it before terminating the process.
this.#worker.ref();
}
};
async makeAsyncRequest(method, ...args) {
this.#waitForWorker();
MessageChannel ??= require('internal/worker/io').MessageChannel;
const asyncCommChannel = new MessageChannel();
// Pass work to the worker.
debug('post async message to worker', { method, args });
this.#worker.postMessage({ method, args, port: asyncCommChannel.port2 }, [asyncCommChannel.port2]);
if (this.#numberOfPendingAsyncResponses++ === 0) {
// On the next lines, the main thread will await a response from the worker thread that might
// come AFTER the last task in the event loop has run its course and there would be nothing
// left keeping the thread alive (and once the main thread dies, the whole process stops).
// However we want to keep the process alive until the worker thread responds (or until the
// event loop of the worker thread is also empty). So we add the beforeExit handler whose
// mission is to lock the main thread until we hear back from the worker thread. The `if`
// condition is there so we only add the event handler once (if there are already pending
// async responses, the previous calls have added the event listener).
process.on('beforeExit', this.#beforeExitHandler);
}
let response;
do {
debug('wait for async response from worker', { method, args });
await AtomicsWaitAsync(this.#lock, WORKER_TO_MAIN_THREAD_NOTIFICATION, this.#workerNotificationLastId).value;
this.#workerNotificationLastId = AtomicsLoad(this.#lock, WORKER_TO_MAIN_THREAD_NOTIFICATION);
// In case the beforeExit handler was called during the await, we revert its actions.
this.#worker.unref();
response = receiveMessageOnPort(asyncCommChannel.port1);
} while (response == null);
debug('got async response from worker', { method, args }, this.#lock);
if (--this.#numberOfPendingAsyncResponses === 0) {
// We got all the responses from the worker, its job is done (until next time).
process.off('beforeExit', this.#beforeExitHandler);
}
const body = this.#unwrapMessage(response);
asyncCommChannel.port1.close();
return body;
}
makeSyncRequest(method, ...args) {
this.#waitForWorker();
// Pass work to the worker.
debug('post sync message to worker', { method, args });
this.#worker.postMessage({ method, args });
let response;
do {
debug('wait for sync response from worker', { method, args });
// Sleep until worker responds.
AtomicsWait(this.#lock, WORKER_TO_MAIN_THREAD_NOTIFICATION, this.#workerNotificationLastId);
this.#workerNotificationLastId = AtomicsLoad(this.#lock, WORKER_TO_MAIN_THREAD_NOTIFICATION);
response = this.#worker.receiveMessageSync();
} while (response == null);
debug('got sync response from worker', { method, args });
if (response.message.status === 'never-settle') {
process.exit(kUnfinishedTopLevelAwait);
} else if (response.message.status === 'exit') {
process.exit(response.message.body);
}
return this.#unwrapMessage(response);
}
#unwrapMessage(response) {
if (response.message.status === 'never-settle') {
return new Promise(() => {});
}
if (response.message.status === 'error') {
if (response.message.body == null) throw response.message.body;
if (response.message.body.serializationFailed || response.message.body.serialized == null) {
throw ERR_WORKER_UNSERIALIZABLE_ERROR();
}
// eslint-disable-next-line no-restricted-syntax
throw deserializeError(response.message.body.serialized);
} else {
return response.message.body;
}
}
#executePreloadScripts(preloadScripts) {
for (let i = 0; i < preloadScripts.length; i++) {
const { code, port } = preloadScripts[i];
const { compileFunction } = require('vm');
const preloadInit = compileFunction(
code,
['getBuiltin', 'port'],
{
filename: '<preload>',
},
);
const { BuiltinModule } = require('internal/bootstrap/realm');
// Calls the compiled preload source text gotten from the hook
// Since the parameters are named we use positional parameters
// see compileFunction above to cross reference the names
FunctionPrototypeCall(
preloadInit,
globalThis,
// Param getBuiltin
(builtinName) => {
if (BuiltinModule.canBeRequiredByUsers(builtinName) &&
BuiltinModule.canBeRequiredWithoutScheme(builtinName)) {
return require(builtinName);
}
throw new ERR_INVALID_ARG_VALUE('builtinName', builtinName);
},
// Param port
port,
);
}
}
}
ObjectSetPrototypeOf(HooksProxy.prototype, null);
/**
* A utility function to pluck the hooks from a user-defined loader.
* @param {import('./loader.js).ModuleExports} exports
* @returns {import('./loader.js).ExportedHooks}
*/
function pluckHooks({
globalPreload,
resolve,
load,
}) {
const acceptedHooks = { __proto__: null };
if (globalPreload) {
acceptedHooks.globalPreload = globalPreload;
}
if (resolve) {
acceptedHooks.resolve = resolve;
}
if (load) {
acceptedHooks.load = load;
}
return acceptedHooks;
}
/**
* A utility function to iterate through a hook chain, track advancement in the
* chain, and generate and supply the `next<HookName>` argument to the custom
* hook.
* @param {KeyedHook[]} chain The whole hook chain.
* @param {object} meta Properties that change as the current hook advances
* along the chain.
* @param {boolean} meta.chainFinished Whether the end of the chain has been
* reached AND invoked.
* @param {string} meta.hookErrIdentifier A user-facing identifier to help
* pinpoint where an error occurred. Ex "file:///foo.mjs 'resolve'".
* @param {number} meta.hookIndex A non-negative integer tracking the current
* position in the hook chain.
* @param {string} meta.hookName The kind of hook the chain is (ex 'resolve')
* @param {boolean} meta.shortCircuited Whether a hook signaled a short-circuit.
* @param {(hookErrIdentifier, hookArgs) => void} validate A wrapper function
* containing all validation of a custom loader hook's intermediary output. Any
* validation within MUST throw.
* @returns {function next<HookName>(...hookArgs)} The next hook in the chain.
*/
function nextHookFactory(chain, meta, { validateArgs, validateOutput }) {
// First, prepare the current
const { hookName } = meta;
const {
fn: hook,
url: hookFilePath,
} = chain[meta.hookIndex];
// ex 'nextResolve'
const nextHookName = `next${
StringPrototypeToUpperCase(hookName[0]) +
StringPrototypeSlice(hookName, 1)
}`;
// When hookIndex is 0, it's reached the default, which does not call next()
// so feed it a noop that blows up if called, so the problem is obvious.
const generatedHookIndex = meta.hookIndex;
let nextNextHook;
if (meta.hookIndex > 0) {
// Now, prepare the next: decrement the pointer so the next call to the
// factory generates the next link in the chain.
meta.hookIndex--;
nextNextHook = nextHookFactory(chain, meta, { validateArgs, validateOutput });
} else {
// eslint-disable-next-line func-name-matching
nextNextHook = function chainAdvancedTooFar() {
throw new ERR_INTERNAL_ASSERTION(
`ESM custom loader '${hookName}' advanced beyond the end of the chain.`,
);
};
}
return ObjectDefineProperty(
async (arg0 = undefined, context) => {
// Update only when hook is invoked to avoid fingering the wrong filePath
meta.hookErrIdentifier = `${hookFilePath} '${hookName}'`;
validateArgs(`${meta.hookErrIdentifier} hook's ${nextHookName}()`, arg0, context);
const outputErrIdentifier = `${chain[generatedHookIndex].url} '${hookName}' hook's ${nextHookName}()`;
// Set when next<HookName> is actually called, not just generated.
if (generatedHookIndex === 0) { meta.chainFinished = true; }
if (context) { // `context` has already been validated, so no fancy check needed.
ObjectAssign(meta.context, context);
}
const output = await hook(arg0, meta.context, nextNextHook);
validateOutput(outputErrIdentifier, output);
if (output?.shortCircuit === true) { meta.shortCircuited = true; }
return output;
},
'name',
{ __proto__: null, value: nextHookName },
);
}
exports.Hooks = Hooks;
exports.HooksProxy = HooksProxy;