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Editing: ChildProcessWorker.js

'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});
exports.default = void 0;

function _child_process() {
  const data = require('child_process');

_child_process = function () {
    return data;
  };

return data;
}

function _stream() {
  const data = require('stream');

_stream = function () {
    return data;
  };

return data;
}

function _mergeStream() {
  const data = _interopRequireDefault(require('merge-stream'));

_mergeStream = function () {
    return data;
  };

return data;
}

function _supportsColor() {
  const data = require('supports-color');

_supportsColor = function () {
    return data;
  };

return data;
}

var _types = require('../types');

function _interopRequireDefault(obj) {
  return obj && obj.__esModule ? obj : {default: obj};
}

const SIGNAL_BASE_EXIT_CODE = 128;
const SIGKILL_EXIT_CODE = SIGNAL_BASE_EXIT_CODE + 9;
const SIGTERM_EXIT_CODE = SIGNAL_BASE_EXIT_CODE + 15; // How long to wait after SIGTERM before sending SIGKILL

const SIGKILL_DELAY = 500;
/**
 * 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, '_request', void 0);

_defineProperty(this, '_retries', void 0);

_defineProperty(this, '_onProcessEnd', void 0);

_defineProperty(this, '_onCustomMessage', void 0);

_defineProperty(this, '_fakeStream', void 0);

_defineProperty(this, '_stdout', void 0);

_defineProperty(this, '_stderr', void 0);

_defineProperty(this, '_exitPromise', void 0);

_defineProperty(this, '_resolveExitPromise', void 0);

this._options = options;
    this._request = null;
    this._fakeStream = null;
    this._stdout = null;
    this._stderr = null;
    this._exitPromise = new Promise(resolve => {
      this._resolveExitPromise = resolve;
    });
    this.initialize();
  }

initialize() {
    const forceColor = _supportsColor().stdout
      ? {
          FORCE_COLOR: '1'
        }
      : {};
    const child = (0, _child_process().fork)(
      require.resolve('./processChild'),
      [],
      {
        cwd: process.cwd(),
        env: {
          ...process.env,
          JEST_WORKER_ID: String(this._options.workerId + 1),
          // 0-indexed workerId, 1-indexed JEST_WORKER_ID
          ...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(
        `Jest worker encountered ${this._retries} child process exceptions, exceeding retry limit`
      );

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;
    }

this._resolveExitPromise();
  }

_onMessage(response) {
    // TODO: Add appropriate type check
    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-expect-error: 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) {
            error[key] = extra[key];
          }
        }

this._onProcessEnd(error, null);

break;

case _types.PARENT_MESSAGE_SETUP_ERROR:
        error = new Error('Error when calling setup: ' + response[2]);
        error.type = response[1];
        error.stack = response[3];

this._onProcessEnd(error, null);

break;

case _types.PARENT_MESSAGE_CUSTOM:
        this._onCustomMessage(response[1]);

break;

default:
        throw new TypeError('Unexpected response from worker: ' + response[0]);
    }
  }

_onExit(exitCode) {
    if (
      exitCode !== 0 &&
      exitCode !== null &&
      exitCode !== SIGTERM_EXIT_CODE &&
      exitCode !== SIGKILL_EXIT_CODE
    ) {
      this.initialize();

if (this._request) {
        this._child.send(this._request);
      }
    } else {
      this._shutdown();
    }
  }

send(request, onProcessStart, onProcessEnd, onCustomMessage) {
    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._onCustomMessage = (...arg) => onCustomMessage(...arg);

this._request = request;
    this._retries = 0;

this._child.send(request, () => {});
  }

waitForExit() {
    return this._exitPromise;
  }

forceExit() {
    this._child.kill('SIGTERM');

const sigkillTimeout = setTimeout(
      () => this._child.kill('SIGKILL'),
      SIGKILL_DELAY
    );

this._exitPromise.then(() => clearTimeout(sigkillTimeout));
  }

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;

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