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const {
ArrayPrototypeForEach,
ArrayPrototypeMap,
ArrayPrototypePush,
Float64Array,
FunctionPrototypeBind,
JSONStringify,
MathMax,
ObjectCreate,
ObjectEntries,
Promise,
PromiseResolve,
ReflectApply,
RegExpPrototypeTest,
SafeArrayIterator,
SafeMap,
String,
Symbol,
SymbolFor,
TypedArrayPrototypeFill,
Uint32Array,
globalThis: { Atomics, SharedArrayBuffer },
} = primordials;
const EventEmitter = require('events');
const assert = require('internal/assert');
const path = require('path');
const { now } = require('internal/perf/utils');
const errorCodes = require('internal/errors').codes;
const {
ERR_WORKER_NOT_RUNNING,
ERR_WORKER_PATH,
ERR_WORKER_UNSERIALIZABLE_ERROR,
ERR_WORKER_INVALID_EXEC_ARGV,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
} = errorCodes;
const { getOptionValue } = require('internal/options');
const workerIo = require('internal/worker/io');
const {
drainMessagePort,
MessageChannel,
messageTypes,
kPort,
kIncrementsPortRef,
kWaitingStreams,
kStdioWantsMoreDataCallback,
setupPortReferencing,
ReadableWorkerStdio,
WritableWorkerStdio
} = workerIo;
const { deserializeError } = require('internal/error_serdes');
const { fileURLToPath, isURLInstance, pathToFileURL } = require('internal/url');
const { kEmptyObject } = require('internal/util');
const { validateArray } = require('internal/validators');
const {
ownsProcessState,
isMainThread,
resourceLimits: resourceLimitsRaw,
threadId,
Worker: WorkerImpl,
kMaxYoungGenerationSizeMb,
kMaxOldGenerationSizeMb,
kCodeRangeSizeMb,
kStackSizeMb,
kTotalResourceLimitCount
} = internalBinding('worker');
const kHandle = Symbol('kHandle');
const kPublicPort = Symbol('kPublicPort');
const kDispose = Symbol('kDispose');
const kOnExit = Symbol('kOnExit');
const kOnMessage = Symbol('kOnMessage');
const kOnCouldNotSerializeErr = Symbol('kOnCouldNotSerializeErr');
const kOnErrorMessage = Symbol('kOnErrorMessage');
const kParentSideStdio = Symbol('kParentSideStdio');
const kLoopStartTime = Symbol('kLoopStartTime');
const kIsOnline = Symbol('kIsOnline');
const SHARE_ENV = SymbolFor('nodejs.worker_threads.SHARE_ENV');
let debug = require('internal/util/debuglog').debuglog('worker', (fn) => {
debug = fn;
});
let cwdCounter;
const environmentData = new SafeMap();
if (isMainThread) {
cwdCounter = new Uint32Array(new SharedArrayBuffer(4));
const originalChdir = process.chdir;
process.chdir = function(path) {
Atomics.add(cwdCounter, 0, 1);
originalChdir(path);
};
}
function setEnvironmentData(key, value) {
if (value === undefined)
environmentData.delete(key);
else
environmentData.set(key, value);
}
function getEnvironmentData(key) {
return environmentData.get(key);
}
function assignEnvironmentData(data) {
if (data === undefined) return;
data.forEach((value, key) => {
environmentData.set(key, value);
});
}
class Worker extends EventEmitter {
constructor(filename, options = kEmptyObject) {
super();
debug(`[${threadId}] create new worker`, filename, options);
if (options.execArgv)
validateArray(options.execArgv, 'options.execArgv');
let argv;
if (options.argv) {
validateArray(options.argv, 'options.argv');
argv = ArrayPrototypeMap(options.argv, String);
}
let url, doEval;
if (options.eval) {
if (typeof filename !== 'string') {
throw new ERR_INVALID_ARG_VALUE(
'options.eval',
options.eval,
'must be false when \'filename\' is not a string'
);
}
url = null;
doEval = 'classic';
} else if (isURLInstance(filename) && filename.protocol === 'data:') {
url = null;
doEval = 'module';
filename = `import ${JSONStringify(`${filename}`)}`;
} else {
doEval = false;
if (isURLInstance(filename)) {
url = filename;
filename = fileURLToPath(filename);
} else if (typeof filename !== 'string') {
throw new ERR_INVALID_ARG_TYPE(
'filename',
['string', 'URL'],
filename
);
} else if (path.isAbsolute(filename) ||
RegExpPrototypeTest(/^\.\.?[\\/]/, filename)) {
filename = path.resolve(filename);
url = pathToFileURL(filename);
} else {
throw new ERR_WORKER_PATH(filename);
}
}
let env;
if (typeof options.env === 'object' && options.env !== null) {
env = ObjectCreate(null);
ArrayPrototypeForEach(
ObjectEntries(options.env),
({ 0: key, 1: value }) => { env[key] = `${value}`; }
);
} else if (options.env == null) {
env = process.env;
} else if (options.env !== SHARE_ENV) {
throw new ERR_INVALID_ARG_TYPE(
'options.env',
['object', 'undefined', 'null', 'worker_threads.SHARE_ENV'],
options.env);
}
// Set up the C++ handle for the worker, as well as some internal wiring.
this[kHandle] = new WorkerImpl(url,
env === process.env ? null : env,
options.execArgv,
parseResourceLimits(options.resourceLimits),
!!(options.trackUnmanagedFds ?? true));
if (this[kHandle].invalidExecArgv) {
throw new ERR_WORKER_INVALID_EXEC_ARGV(this[kHandle].invalidExecArgv);
}
if (this[kHandle].invalidNodeOptions) {
throw new ERR_WORKER_INVALID_EXEC_ARGV(
this[kHandle].invalidNodeOptions, 'invalid NODE_OPTIONS env variable');
}
this[kHandle].onexit = (code, customErr, customErrReason) => {
this[kOnExit](code, customErr, customErrReason);
};
this[kPort] = this[kHandle].messagePort;
this[kPort].on('message', (data) => this[kOnMessage](data));
this[kPort].start();
this[kPort].unref();
this[kPort][kWaitingStreams] = 0;
debug(`[${threadId}] created Worker with ID ${this.threadId}`);
let stdin = null;
if (options.stdin)
stdin = new WritableWorkerStdio(this[kPort], 'stdin');
const stdout = new ReadableWorkerStdio(this[kPort], 'stdout');
if (!options.stdout) {
stdout[kIncrementsPortRef] = false;
pipeWithoutWarning(stdout, process.stdout);
}
const stderr = new ReadableWorkerStdio(this[kPort], 'stderr');
if (!options.stderr) {
stderr[kIncrementsPortRef] = false;
pipeWithoutWarning(stderr, process.stderr);
}
this[kParentSideStdio] = { stdin, stdout, stderr };
const { port1, port2 } = new MessageChannel();
const transferList = [port2];
// If transferList is provided.
if (options.transferList)
ArrayPrototypePush(transferList,
...new SafeArrayIterator(options.transferList));
this[kPublicPort] = port1;
ArrayPrototypeForEach(['message', 'messageerror'], (event) => {
this[kPublicPort].on(event, (message) => this.emit(event, message));
});
setupPortReferencing(this[kPublicPort], this, 'message');
this[kPort].postMessage({
argv,
type: messageTypes.LOAD_SCRIPT,
filename,
doEval,
cwdCounter: cwdCounter || workerIo.sharedCwdCounter,
workerData: options.workerData,
environmentData,
publicPort: port2,
manifestURL: getOptionValue('--experimental-policy') ?
require('internal/process/policy').url :
null,
manifestSrc: getOptionValue('--experimental-policy') ?
require('internal/process/policy').src :
null,
hasStdin: !!options.stdin
}, transferList);
// Use this to cache the Worker's loopStart value once available.
this[kLoopStartTime] = -1;
this[kIsOnline] = false;
this.performance = {
eventLoopUtilization: FunctionPrototypeBind(eventLoopUtilization, this),
};
// Actually start the new thread now that everything is in place.
this[kHandle].startThread();
process.nextTick(() => process.emit('worker', this));
}
[kOnExit](code, customErr, customErrReason) {
debug(`[${threadId}] hears end event for Worker ${this.threadId}`);
drainMessagePort(this[kPublicPort]);
drainMessagePort(this[kPort]);
this.removeAllListeners('message');
this.removeAllListeners('messageerrors');
this[kPublicPort].unref();
this[kPort].unref();
this[kDispose]();
if (customErr) {
debug(`[${threadId}] failing with custom error ${customErr} \
and with reason ${customErrReason}`);
this.emit('error', new errorCodes[customErr](customErrReason));
}
this.emit('exit', code);
this.removeAllListeners();
}
[kOnCouldNotSerializeErr]() {
this.emit('error', new ERR_WORKER_UNSERIALIZABLE_ERROR());
}
[kOnErrorMessage](serialized) {
// This is what is called for uncaught exceptions.
const error = deserializeError(serialized);
this.emit('error', error);
}
[kOnMessage](message) {
switch (message.type) {
case messageTypes.UP_AND_RUNNING:
this[kIsOnline] = true;
return this.emit('online');
case messageTypes.COULD_NOT_SERIALIZE_ERROR:
return this[kOnCouldNotSerializeErr]();
case messageTypes.ERROR_MESSAGE:
return this[kOnErrorMessage](message.error);
case messageTypes.STDIO_PAYLOAD:
{
const { stream, chunks } = message;
const readable = this[kParentSideStdio][stream];
ArrayPrototypeForEach(chunks, ({ chunk, encoding }) => {
readable.push(chunk, encoding);
});
return;
}
case messageTypes.STDIO_WANTS_MORE_DATA:
{
const { stream } = message;
return this[kParentSideStdio][stream][kStdioWantsMoreDataCallback]();
}
}
assert.fail(`Unknown worker message type ${message.type}`);
}
[kDispose]() {
this[kHandle].onexit = null;
this[kHandle] = null;
this[kPort] = null;
this[kPublicPort] = null;
const { stdout, stderr } = this[kParentSideStdio];
if (!stdout.readableEnded) {
debug(`[${threadId}] explicitly closes stdout for ${this.threadId}`);
stdout.push(null);
}
if (!stderr.readableEnded) {
debug(`[${threadId}] explicitly closes stderr for ${this.threadId}`);
stderr.push(null);
}
}
postMessage(...args) {
if (this[kPublicPort] === null) return;
ReflectApply(this[kPublicPort].postMessage, this[kPublicPort], args);
}
terminate(callback) {
debug(`[${threadId}] terminates Worker with ID ${this.threadId}`);
this.ref();
if (typeof callback === 'function') {
process.emitWarning(
'Passing a callback to worker.terminate() is deprecated. ' +
'It returns a Promise instead.',
'DeprecationWarning', 'DEP0132');
if (this[kHandle] === null) return PromiseResolve();
this.once('exit', (exitCode) => callback(null, exitCode));
}
if (this[kHandle] === null) return PromiseResolve();
this[kHandle].stopThread();
// Do not use events.once() here, because the 'exit' event will always be
// emitted regardless of any errors, and the point is to only resolve
// once the thread has actually stopped.
return new Promise((resolve) => {
this.once('exit', resolve);
});
}
ref() {
if (this[kHandle] === null) return;
this[kHandle].ref();
this[kPublicPort].ref();
}
unref() {
if (this[kHandle] === null) return;
this[kHandle].unref();
this[kPublicPort].unref();
}
get threadId() {
if (this[kHandle] === null) return -1;
return this[kHandle].threadId;
}
get stdin() {
return this[kParentSideStdio].stdin;
}
get stdout() {
return this[kParentSideStdio].stdout;
}
get stderr() {
return this[kParentSideStdio].stderr;
}
get resourceLimits() {
if (this[kHandle] === null) return {};
return makeResourceLimits(this[kHandle].getResourceLimits());
}
getHeapSnapshot() {
const heapSnapshotTaker = this[kHandle] && this[kHandle].takeHeapSnapshot();
return new Promise((resolve, reject) => {
if (!heapSnapshotTaker) return reject(new ERR_WORKER_NOT_RUNNING());
heapSnapshotTaker.ondone = (handle) => {
const { HeapSnapshotStream } = require('internal/heap_utils');
resolve(new HeapSnapshotStream(handle));
};
});
}
}
function pipeWithoutWarning(source, dest) {
const sourceMaxListeners = source._maxListeners;
const destMaxListeners = dest._maxListeners;
source.setMaxListeners(Infinity);
dest.setMaxListeners(Infinity);
source.pipe(dest);
source._maxListeners = sourceMaxListeners;
dest._maxListeners = destMaxListeners;
}
const resourceLimitsArray = new Float64Array(kTotalResourceLimitCount);
function parseResourceLimits(obj) {
const ret = resourceLimitsArray;
TypedArrayPrototypeFill(ret, -1);
if (typeof obj !== 'object' || obj === null) return ret;
if (typeof obj.maxOldGenerationSizeMb === 'number')
ret[kMaxOldGenerationSizeMb] = MathMax(obj.maxOldGenerationSizeMb, 2);
if (typeof obj.maxYoungGenerationSizeMb === 'number')
ret[kMaxYoungGenerationSizeMb] = obj.maxYoungGenerationSizeMb;
if (typeof obj.codeRangeSizeMb === 'number')
ret[kCodeRangeSizeMb] = obj.codeRangeSizeMb;
if (typeof obj.stackSizeMb === 'number')
ret[kStackSizeMb] = obj.stackSizeMb;
return ret;
}
function makeResourceLimits(float64arr) {
return {
maxYoungGenerationSizeMb: float64arr[kMaxYoungGenerationSizeMb],
maxOldGenerationSizeMb: float64arr[kMaxOldGenerationSizeMb],
codeRangeSizeMb: float64arr[kCodeRangeSizeMb],
stackSizeMb: float64arr[kStackSizeMb]
};
}
function eventLoopUtilization(util1, util2) {
// TODO(trevnorris): Works to solve the thread-safe read/write issue of
// loopTime, but has the drawback that it can't be set until the event loop
// has had a chance to turn. So it will be impossible to read the ELU of
// a worker thread immediately after it's been created.
if (!this[kIsOnline] || !this[kHandle]) {
return { idle: 0, active: 0, utilization: 0 };
}
// Cache loopStart, since it's only written to once.
if (this[kLoopStartTime] === -1) {
this[kLoopStartTime] = this[kHandle].loopStartTime();
if (this[kLoopStartTime] === -1)
return { idle: 0, active: 0, utilization: 0 };
}
if (util2) {
const idle = util1.idle - util2.idle;
const active = util1.active - util2.active;
return { idle, active, utilization: active / (idle + active) };
}
const idle = this[kHandle].loopIdleTime();
// Using performance.now() here is fine since it's always the time from
// the beginning of the process, and is why it needs to be offset by the
// loopStart time (which is also calculated from the beginning of the
// process).
const active = now() - this[kLoopStartTime] - idle;
if (!util1) {
return { idle, active, utilization: active / (idle + active) };
}
const idle_delta = idle - util1.idle;
const active_delta = active - util1.active;
const utilization = active_delta / (idle_delta + active_delta);
return { idle: idle_delta, active: active_delta, utilization };
}
module.exports = {
ownsProcessState,
isMainThread,
SHARE_ENV,
resourceLimits:
!isMainThread ? makeResourceLimits(resourceLimitsRaw) : {},
setEnvironmentData,
getEnvironmentData,
assignEnvironmentData,
threadId,
Worker,
};
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