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setup-python/node_modules/jest-worker/build/workers/ChildProcessWorker.js
Danny McCormick 39c08a0eaa Initial pass
2019-06-26 21:12:00 -04:00

310 lines
7.5 KiB
JavaScript

'use strict';
Object.defineProperty(exports, '__esModule', {
value: true
});
exports.default = void 0;
function _child_process() {
const data = _interopRequireDefault(require('child_process'));
_child_process = function _child_process() {
return data;
};
return data;
}
function _stream() {
const data = require('stream');
_stream = function _stream() {
return data;
};
return data;
}
function _mergeStream() {
const data = _interopRequireDefault(require('merge-stream'));
_mergeStream = function _mergeStream() {
return data;
};
return data;
}
function _supportsColor() {
const data = _interopRequireDefault(require('supports-color'));
_supportsColor = function _supportsColor() {
return data;
};
return data;
}
var _types = require('../types');
function _interopRequireDefault(obj) {
return obj && obj.__esModule ? obj : {default: obj};
}
function _objectSpread(target) {
for (var i = 1; i < arguments.length; i++) {
var source = arguments[i] != null ? arguments[i] : {};
var ownKeys = Object.keys(source);
if (typeof Object.getOwnPropertySymbols === 'function') {
ownKeys = ownKeys.concat(
Object.getOwnPropertySymbols(source).filter(function(sym) {
return Object.getOwnPropertyDescriptor(source, sym).enumerable;
})
);
}
ownKeys.forEach(function(key) {
_defineProperty(target, key, source[key]);
});
}
return target;
}
function _defineProperty(obj, key, value) {
if (key in obj) {
Object.defineProperty(obj, key, {
value: value,
enumerable: true,
configurable: true,
writable: true
});
} else {
obj[key] = value;
}
return obj;
}
/**
* This class wraps the child process and provides a nice interface to
* communicate with. It takes care of:
*
* - Re-spawning the process if it dies.
* - Queues calls while the worker is busy.
* - Re-sends the requests if the worker blew up.
*
* The reason for queueing them here (since childProcess.send also has an
* internal queue) is because the worker could be doing asynchronous work, and
* this would lead to the child process to read its receiving buffer and start a
* second call. By queueing calls here, we don't send the next call to the
* children until we receive the result of the previous one.
*
* As soon as a request starts to be processed by a worker, its "processed"
* field is changed to "true", so that other workers which might encounter the
* same call skip it.
*/
class ChildProcessWorker {
constructor(options) {
_defineProperty(this, '_child', void 0);
_defineProperty(this, '_options', void 0);
_defineProperty(this, '_onProcessEnd', void 0);
_defineProperty(this, '_fakeStream', void 0);
_defineProperty(this, '_request', void 0);
_defineProperty(this, '_retries', void 0);
_defineProperty(this, '_stderr', void 0);
_defineProperty(this, '_stdout', void 0);
this._options = options;
this._fakeStream = null;
this._request = null;
this._stderr = null;
this._stdout = null;
this.initialize();
}
initialize() {
const forceColor = _supportsColor().default.stdout
? {
FORCE_COLOR: '1'
}
: {};
const child = _child_process().default.fork(
require.resolve('./processChild'),
[],
_objectSpread(
{
cwd: process.cwd(),
env: _objectSpread(
{},
process.env,
{
JEST_WORKER_ID: String(this._options.workerId + 1)
},
forceColor
),
// Suppress --debug / --inspect flags while preserving others (like --harmony).
execArgv: process.execArgv.filter(v => !/^--(debug|inspect)/.test(v)),
silent: true
},
this._options.forkOptions
)
);
if (child.stdout) {
if (!this._stdout) {
// We need to add a permanent stream to the merged stream to prevent it
// from ending when the subprocess stream ends
this._stdout = (0, _mergeStream().default)(this._getFakeStream());
}
this._stdout.add(child.stdout);
}
if (child.stderr) {
if (!this._stderr) {
// We need to add a permanent stream to the merged stream to prevent it
// from ending when the subprocess stream ends
this._stderr = (0, _mergeStream().default)(this._getFakeStream());
}
this._stderr.add(child.stderr);
}
child.on('message', this.onMessage.bind(this));
child.on('exit', this.onExit.bind(this));
child.send([
_types.CHILD_MESSAGE_INITIALIZE,
false,
this._options.workerPath,
this._options.setupArgs
]);
this._child = child;
this._retries++; // If we exceeded the amount of retries, we will emulate an error reply
// coming from the child. This avoids code duplication related with cleaning
// the queue, and scheduling the next call.
if (this._retries > this._options.maxRetries) {
const error = new Error('Call retries were exceeded');
this.onMessage([
_types.PARENT_MESSAGE_CLIENT_ERROR,
error.name,
error.message,
error.stack,
{
type: 'WorkerError'
}
]);
}
}
_shutdown() {
// End the temporary streams so the merged streams end too
if (this._fakeStream) {
this._fakeStream.end();
this._fakeStream = null;
}
}
onMessage(response) {
let error;
switch (response[0]) {
case _types.PARENT_MESSAGE_OK:
this._onProcessEnd(null, response[1]);
break;
case _types.PARENT_MESSAGE_CLIENT_ERROR:
error = response[4];
if (error != null && typeof error === 'object') {
const extra = error; // @ts-ignore: no index
const NativeCtor = global[response[1]];
const Ctor = typeof NativeCtor === 'function' ? NativeCtor : Error;
error = new Ctor(response[2]);
error.type = response[1];
error.stack = response[3];
for (const key in extra) {
// @ts-ignore: adding custom properties to errors.
error[key] = extra[key];
}
}
this._onProcessEnd(error, null);
break;
case _types.PARENT_MESSAGE_SETUP_ERROR:
error = new Error('Error when calling setup: ' + response[2]); // @ts-ignore: adding custom properties to errors.
error.type = response[1];
error.stack = response[3];
this._onProcessEnd(error, null);
break;
default:
throw new TypeError('Unexpected response from worker: ' + response[0]);
}
}
onExit(exitCode) {
if (exitCode !== 0) {
this.initialize();
if (this._request) {
this._child.send(this._request);
}
} else {
this._shutdown();
}
}
send(request, onProcessStart, onProcessEnd) {
onProcessStart(this);
this._onProcessEnd = (...args) => {
// Clean the request to avoid sending past requests to workers that fail
// while waiting for a new request (timers, unhandled rejections...)
this._request = null;
return onProcessEnd(...args);
};
this._request = request;
this._retries = 0;
this._child.send(request);
}
getWorkerId() {
return this._options.workerId;
}
getStdout() {
return this._stdout;
}
getStderr() {
return this._stderr;
}
_getFakeStream() {
if (!this._fakeStream) {
this._fakeStream = new (_stream()).PassThrough();
}
return this._fakeStream;
}
}
exports.default = ChildProcessWorker;