All files / src event-handler.js

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/*
*
* All objects in the event handling chain should inherit from this class
*
*/
 
import { logger } from './utils/logger';
import { ErrorTypes, ErrorDetails } from './errors';
import Event from './events';
 
const FORBIDDEN_EVENT_NAMES = new Set([
  'hlsEventGeneric',
  'hlsHandlerDestroying',
  'hlsHandlerDestroyed'
]);
 
class EventHandler {
  constructor (hls, ...events) {
    this.hls = hls;
    this.onEvent = this.onEvent.bind(this);
    this.handledEvents = events;
    this.useGenericHandler = true;
 
    this.registerListeners();
  }
 
  destroy () {
    this.onHandlerDestroying();
    this.unregisterListeners();
    this.onHandlerDestroyed();
  }
 
  onHandlerDestroying () {}
  onHandlerDestroyed () {}
 
  isEventHandler () {
    return typeof this.handledEvents === 'object' && this.handledEvents.length && typeof this.onEvent === 'function';
  }
 
  registerListeners () {
    Eif (this.isEventHandler()) {
      this.handledEvents.forEach(function (event) {
        Iif (FORBIDDEN_EVENT_NAMES.has(event))
          throw new Error('Forbidden event-name: ' + event);
 
        this.hls.on(event, this.onEvent);
      }, this);
    }
  }
 
  unregisterListeners () {
    if (this.isEventHandler()) {
      this.handledEvents.forEach(function (event) {
        this.hls.off(event, this.onEvent);
      }, this);
    }
  }
 
  /**
   * arguments: event (string), data (any)
   */
  onEvent (event, data) {
    this.onEventGeneric(event, data);
  }
 
  onEventGeneric (event, data) {
    let eventToFunction = function (event, data) {
      let funcName = 'on' + event.replace('hls', '');
      Iif (typeof this[funcName] !== 'function')
        throw new Error(`Event ${event} has no generic handler in this ${this.constructor.name} class (tried ${funcName})`);
 
      return this[funcName].bind(this, data);
    };
    try {
      eventToFunction.call(this, event, data).call();
    } catch (err) {
      logger.error(`An internal error happened while handling event ${event}. Error message: "${err.message}". Here is a stacktrace:`, err);
      this.hls.trigger(Event.ERROR, { type: ErrorTypes.OTHER_ERROR, details: ErrorDetails.INTERNAL_EXCEPTION, fatal: false, event: event, err: err });
    }
  }
}
 
export default EventHandler;