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'use strict';
// This file contains process bootstrappers that can only be
// run in the worker thread.
const {
getEnvMessagePort,
threadId
} = internalBinding('worker');
const {
messageTypes,
kStdioWantsMoreDataCallback,
kWaitingStreams,
ReadableWorkerStdio,
WritableWorkerStdio
} = require('internal/worker/io');
const {
codes: { ERR_WORKER_UNSUPPORTED_OPERATION }
} = require('internal/errors');
let debuglog;
function debug(...args) {
if (!debuglog) {
debuglog = require('util').debuglog('worker');
}
return debuglog(...args);
}
const workerStdio = {};
function initializeWorkerStdio() {
const port = getEnvMessagePort();
port[kWaitingStreams] = 0;
workerStdio.stdin = new ReadableWorkerStdio(port, 'stdin');
workerStdio.stdout = new WritableWorkerStdio(port, 'stdout');
workerStdio.stderr = new WritableWorkerStdio(port, 'stderr');
return {
getStdout() { return workerStdio.stdout; },
getStderr() { return workerStdio.stderr; },
getStdin() { return workerStdio.stdin; }
};
}
function createMessageHandler(port, prepareUserCodeExecution) {
const publicWorker = require('worker_threads');
return function(message) {
if (message.type === messageTypes.LOAD_SCRIPT) {
const {
filename,
doEval,
workerData,
publicPort,
manifestSrc,
manifestURL,
hasStdin
} = message;
if (manifestSrc) {
require('internal/process/policy').setup(manifestSrc, manifestURL);
}
prepareUserCodeExecution();
publicWorker.parentPort = publicPort;
publicWorker.workerData = workerData;
if (!hasStdin)
workerStdio.stdin.push(null);
debug(`[${threadId}] starts worker script ${filename} ` +
`(eval = ${eval}) at cwd = ${process.cwd()}`);
port.unref();
port.postMessage({ type: messageTypes.UP_AND_RUNNING });
if (doEval) {
const { evalScript } = require('internal/process/execution');
evalScript('[worker eval]', filename);
} else {
process.argv[1] = filename; // script filename
require('module').runMain();
}
return;
} else if (message.type === messageTypes.STDIO_PAYLOAD) {
const { stream, chunk, encoding } = message;
workerStdio[stream].push(chunk, encoding);
return;
} else if (message.type === messageTypes.STDIO_WANTS_MORE_DATA) {
const { stream } = message;
workerStdio[stream][kStdioWantsMoreDataCallback]();
return;
}
require('assert').fail(`Unknown worker message type ${message.type}`);
};
}
// XXX(joyeecheung): this has to be returned as an anonymous function
// wrapped in a closure, see the comment of the original
// process._fatalException in lib/internal/process/execution.js
function createWorkerFatalExeception(port) {
const {
fatalException: originalFatalException
} = require('internal/process/execution');
return (error) => {
debug(`[${threadId}] gets fatal exception`);
let caught = false;
try {
caught = originalFatalException.call(this, error);
} catch (e) {
error = e;
}
debug(`[${threadId}] fatal exception caught = ${caught}`);
if (!caught) {
let serialized;
try {
const { serializeError } = require('internal/error-serdes');
serialized = serializeError(error);
} catch {}
debug(`[${threadId}] fatal exception serialized = ${!!serialized}`);
if (serialized)
port.postMessage({
type: messageTypes.ERROR_MESSAGE,
error: serialized
});
else
port.postMessage({ type: messageTypes.COULD_NOT_SERIALIZE_ERROR });
const { clearAsyncIdStack } = require('internal/async_hooks');
clearAsyncIdStack();
process.exit();
}
};
}
// The execution of this function itself should not cause any side effects.
function wrapProcessMethods(binding) {
function umask(mask) {
// process.umask() is a read-only operation in workers.
if (mask !== undefined) {
throw new ERR_WORKER_UNSUPPORTED_OPERATION('Setting process.umask()');
}
return binding.umask(mask);
}
return { umask };
}
module.exports = {
initializeWorkerStdio,
createMessageHandler,
createWorkerFatalExeception,
wrapProcessMethods
};
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