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// In worker threads, execute the script sent through the
// message port.
const {
ArrayPrototypeForEach,
ArrayPrototypePushApply,
ArrayPrototypeSplice,
ObjectDefineProperty,
PromisePrototypeThen,
RegExpPrototypeExec,
globalThis: { Atomics },
} = primordials;
const {
patchProcessObject,
setupCoverageHooks,
setupInspectorHooks,
setupWarningHandler,
setupFetch,
setupWebCrypto,
setupCustomEvent,
setupDebugEnv,
setupPerfHooks,
initializeDeprecations,
initializeWASI,
initializeCJSLoader,
initializeESMLoader,
initializeFrozenIntrinsics,
initializeReport,
initializeSourceMapsHandlers,
loadPreloadModules,
setupTraceCategoryState,
markBootstrapComplete
} = require('internal/process/pre_execution');
const {
threadId,
getEnvMessagePort
} = internalBinding('worker');
const workerIo = require('internal/worker/io');
const {
messageTypes: {
// Messages that may be received by workers
LOAD_SCRIPT,
// Messages that may be posted from workers
UP_AND_RUNNING,
ERROR_MESSAGE,
COULD_NOT_SERIALIZE_ERROR,
// Messages that may be either received or posted
STDIO_PAYLOAD,
STDIO_WANTS_MORE_DATA,
},
kStdioWantsMoreDataCallback
} = workerIo;
const {
onGlobalUncaughtException
} = require('internal/process/execution');
const publicWorker = require('worker_threads');
let debug = require('internal/util/debuglog').debuglog('worker', (fn) => {
debug = fn;
});
const assert = require('internal/assert');
patchProcessObject();
setupInspectorHooks();
setupDebugEnv();
setupWarningHandler();
setupFetch();
setupWebCrypto();
setupCustomEvent();
initializeSourceMapsHandlers();
// Since worker threads cannot switch cwd, we do not need to
// overwrite the process.env.NODE_V8_COVERAGE variable.
if (process.env.NODE_V8_COVERAGE) {
setupCoverageHooks(process.env.NODE_V8_COVERAGE);
}
debug(`[${threadId}] is setting up worker child environment`);
// Set up the message port and start listening
const port = getEnvMessagePort();
// If the main thread is spawned with env NODE_CHANNEL_FD, it's probably
// spawned by our child_process module. In the work threads, mark the
// related IPC properties as unavailable.
if (process.env.NODE_CHANNEL_FD) {
const workerThreadSetup = require('internal/process/worker_thread_only');
ObjectDefineProperty(process, 'channel', {
__proto__: null,
enumerable: false,
get: workerThreadSetup.unavailable('process.channel')
});
ObjectDefineProperty(process, 'connected', {
__proto__: null,
enumerable: false,
get: workerThreadSetup.unavailable('process.connected')
});
process.send = workerThreadSetup.unavailable('process.send()');
process.disconnect =
workerThreadSetup.unavailable('process.disconnect()');
}
port.on('message', (message) => {
if (message.type === LOAD_SCRIPT) {
port.unref();
const {
argv,
cwdCounter,
filename,
doEval,
workerData,
environmentData,
publicPort,
manifestSrc,
manifestURL,
hasStdin
} = message;
setupTraceCategoryState();
setupPerfHooks();
initializeReport();
if (manifestSrc) {
require('internal/process/policy').setup(manifestSrc, manifestURL);
}
initializeDeprecations();
initializeWASI();
require('internal/dns/utils').initializeDns();
initializeCJSLoader();
initializeESMLoader();
if (argv !== undefined) {
ArrayPrototypePushApply(process.argv, argv);
}
publicWorker.parentPort = publicPort;
publicWorker.workerData = workerData;
require('internal/worker').assignEnvironmentData(environmentData);
// The counter is only passed to the workers created by the main thread, not
// to workers created by other workers.
let cachedCwd = '';
let lastCounter = -1;
const originalCwd = process.cwd;
process.cwd = function() {
const currentCounter = Atomics.load(cwdCounter, 0);
if (currentCounter === lastCounter)
return cachedCwd;
lastCounter = currentCounter;
cachedCwd = originalCwd();
return cachedCwd;
};
workerIo.sharedCwdCounter = cwdCounter;
const CJSLoader = require('internal/modules/cjs/loader');
assert(!CJSLoader.hasLoadedAnyUserCJSModule);
loadPreloadModules();
initializeFrozenIntrinsics();
if (!hasStdin)
process.stdin.push(null);
debug(`[${threadId}] starts worker script ${filename} ` +
`(eval = ${doEval}) at cwd = ${process.cwd()}`);
port.postMessage({ type: UP_AND_RUNNING });
if (doEval === 'classic') {
const { evalScript } = require('internal/process/execution');
const name = '[worker eval]';
// This is necessary for CJS module compilation.
// TODO: pass this with something really internal.
ObjectDefineProperty(process, '_eval', {
__proto__: null,
configurable: true,
enumerable: true,
value: filename,
});
ArrayPrototypeSplice(process.argv, 1, 0, name);
evalScript(name, filename);
} else if (doEval === 'module') {
const { evalModule } = require('internal/process/execution');
PromisePrototypeThen(evalModule(filename), undefined, (e) => {
workerOnGlobalUncaughtException(e, true);
});
} else {
// script filename
// runMain here might be monkey-patched by users in --require.
// XXX: the monkey-patchability here should probably be deprecated.
ArrayPrototypeSplice(process.argv, 1, 0, filename);
CJSLoader.Module.runMain(filename);
}
} else if (message.type === STDIO_PAYLOAD) {
const { stream, chunks } = message;
ArrayPrototypeForEach(chunks, ({ chunk, encoding }) => {
process[stream].push(chunk, encoding);
});
} else {
assert(
message.type === STDIO_WANTS_MORE_DATA,
`Unknown worker message type ${message.type}`
);
const { stream } = message;
process[stream][kStdioWantsMoreDataCallback]();
}
});
function workerOnGlobalUncaughtException(error, fromPromise) {
debug(`[${threadId}] gets uncaught exception`);
let handled = false;
let handlerThrew = false;
try {
handled = onGlobalUncaughtException(error, fromPromise);
} catch (e) {
error = e;
handlerThrew = true;
}
debug(`[${threadId}] uncaught exception handled = ${handled}`);
if (handled) {
return true;
}
if (!process._exiting) {
try {
process._exiting = true;
process.exitCode = 1;
if (!handlerThrew) {
process.emit('exit', process.exitCode);
}
} catch {
// Continue regardless of error.
}
}
let serialized;
try {
const { serializeError } = require('internal/error_serdes');
serialized = serializeError(error);
} catch {
// Continue regardless of error.
}
debug(`[${threadId}] uncaught exception serialized = ${!!serialized}`);
if (serialized)
port.postMessage({
type: ERROR_MESSAGE,
error: serialized
});
else
port.postMessage({ type: COULD_NOT_SERIALIZE_ERROR });
const { clearAsyncIdStack } = require('internal/async_hooks');
clearAsyncIdStack();
process.exit();
}
// Patch the global uncaught exception handler so it gets picked up by
// node::errors::TriggerUncaughtException().
process._fatalException = workerOnGlobalUncaughtException;
markBootstrapComplete();
// Necessary to reset RegExp statics before user code runs.
RegExpPrototypeExec(/^/, '');
port.start();
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