108 lines
3.5 KiB
JavaScript
108 lines
3.5 KiB
JavaScript
'use strict';
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// Called by `child_process` `fork` in `run-in-child-process.js` so we can
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// get the data and exit the process cleanly.
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const assert = require('assert');
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const RethrownError = require('../lib/rethrown-error');
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// Serialize the error and send it back up to the parent process so we can
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// interact with it and know what happened when the process exits.
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async function serializeError(err) {
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await new Promise((resolve) => {
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process.send(
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{
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error: true,
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name: err.name,
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message: err.message,
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stack: err.stack,
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},
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(sendErr) => {
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if (sendErr) {
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// We just log here instead of rejecting because it's more important
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// to see the original error we are trying to send up. Let's just
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// throw the original error below.
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const sendErrWithDescription = new RethrownError(
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'Failed to send error to the parent process',
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sendErr
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);
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console.error(sendErrWithDescription);
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// This will end up hitting the `unhandledRejection` handler and
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// serializing this error instead (worth a shot) 🤷♀️
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throw sendErrWithDescription;
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}
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resolve();
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}
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);
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});
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}
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// We don't exit the process after encountering one of these because maybe it
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// doesn't matter to the main-line process in the module.
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//
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// If we don't listen for these events, the child will exit with status code 1
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// (error) when they occur.
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process.on('uncaughtException', async (err /*, origin*/) => {
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console.log('2 uncaughtException', err);
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await serializeError(new RethrownError('uncaughtException in child process', err));
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});
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process.on('unhandledRejection', async (reason /*, promise*/) => {
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await serializeError(new RethrownError('unhandledRejection in child process', reason));
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});
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// Only kick everything off once we receive the options. We pass in the options
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// this way instead of argv because we will run into `Error: spawn E2BIG` and
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// `Error: spawn ENAMETOOLONG` with argv.
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process.on('message', async (runArguments) => {
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try {
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assert(runArguments);
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// Require the module that we're supposed to run
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const modulePath = process.argv[2];
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assert(
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modulePath,
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'Expected `modulePath` to be passed into `child-fork-script.js` via argv[2]'
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);
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const moduleToRun = require(modulePath);
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// Run the module
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const result = await moduleToRun(runArguments);
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assert(result, `No result returned from module we ran (${modulePath}).`);
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// Send back the data we need to the parent.
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await new Promise((resolve, reject) => {
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process.send(
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{
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data: result,
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},
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(err) => {
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if (err) {
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return reject(err);
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}
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// Exit once we know the data was sent out. We can't gurantee the
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// message was received but this should work pretty well.
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//
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// Related:
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// - https://stackoverflow.com/questions/34627546/process-send-is-sync-async-on-nix-windows
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// - https://github.com/nodejs/node/commit/56d9584a0ead78874ca9d4de2e55b41c4056e502
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// - https://github.com/nodejs/node/issues/6767
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process.exit(0);
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resolve();
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}
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);
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});
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} catch (err) {
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// We need to wait for the error to completely send to the parent
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// process before we exit the process.
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await serializeError(err);
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// Fail the process and exit
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process.exit(1);
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}
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});
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