childprocess-messageport/lib/index.js

Turns ChildProcess IPC into MessagePort

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _websocketUtil = require('websocket-util');

class ChildProcessMessagePort extends _websocketUtil.HTMLEventEmitter {
  constructor(childProcess) {
    super();

    this.childProcess = childProcess;
    this.handleDisconnect = this.handleDisconnect.bind(this);
    this.handleMessage = this.handleMessage.bind(this);
    this.origin = `child-process://${this.childProcess.pid}/`;

    ['error', 'message', 'messageerror'].forEach(name => (0, _websocketUtil.hoistLegacyEventHandler)(this, name));

    childProcess.once('disconnect', this.handleDisconnect);
    childProcess.on('message', this.handleMessage);
  }

  handleDisconnect() {
    this.childProcess.removeListener('disconnect', this.handleDisconnect);
    this.childProcess.removeListener('message', this.handleMessage);
  }

  handleMessage(data) {
    let deserialized;

    try {
      deserialized = (0, _websocketUtil.deserialize)(data);
    } catch (err) {
      return this.emit('messageerror', {
        origin: this.origin,
        source: this,
        type: 'messageerror'
      });
    }

    this.emit('message', {
      data: deserialized,
      origin: this.origin,
      source: this,
      type: 'message'
    });
  }

  postMessage(data) {
    this.childProcess.send((0, _websocketUtil.serialize)(data), error => {
      error && this.emit('error', { error });
    });
  }
}
exports.default = ChildProcessMessagePort;
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