Your IP : 216.73.216.86
/* eslint-disable @bitrix24/bitrix24-rules/no-native-events-binding */
import { ConnectionType } from '../../../client/src/consts';
import { AbstractConnector } from './base';
import { getDateForLog, isNotEmptyString } from '../../../util/src/util';
import type { ConnectorOptions } from './base';
const LONG_POLLING_TIMEOUT = 60;
type LongPollingConnectorOptions = ConnectorOptions & {
isBinary: boolean,
getPublicationPath: () => string,
}
export class LongPollingConnector extends AbstractConnector
{
connectionType = ConnectionType.LongPolling;
active = false;
requestTimeout = null;
failureTimeout = null;
requestAborted = false;
constructor(config: LongPollingConnectorOptions)
{
super(config);
this.xhr = this.createXhr();
this.isBinary = config.isBinary;
}
createXhr(): XMLHttpRequest
{
const result = new XMLHttpRequest();
if (this.isBinary)
{
result.responseType = 'arraybuffer';
}
result.addEventListener('readystatechange', this.onXhrReadyStateChange.bind(this));
return result;
}
connect()
{
this.active = true;
this.performRequest();
}
disconnect(code, reason)
{
this.active = false;
if (this.failureTimeout)
{
clearTimeout(this.failureTimeout);
this.failureTimeout = null;
}
if (this.requestTimeout)
{
clearTimeout(this.requestTimeout);
this.requestTimeout = null;
}
if (this.xhr)
{
this.requestAborted = true;
this.xhr.abort();
}
this.disconnectCode = code;
this.disconnectReason = reason;
this.connected = false;
}
performRequest()
{
if (!this.active)
{
return;
}
if (!this.path)
{
throw new Error('Long polling connection path is not defined');
}
if (this.xhr.readyState !== 0 && this.xhr.readyState !== 4)
{
return;
}
clearTimeout(this.failureTimeout);
clearTimeout(this.requestTimeout);
this.failureTimeout = setTimeout(
() => {
this.connected = true;
},
5000,
);
this.requestTimeout = setTimeout(this.onRequestTimeout.bind(this), LONG_POLLING_TIMEOUT * 1000);
this.xhr.open('GET', this.path);
this.xhr.send();
}
onRequestTimeout()
{
this.requestAborted = true;
this.xhr.abort();
this.performRequest();
}
onXhrReadyStateChange()
{
if (this.xhr.readyState === 4)
{
if (!this.requestAborted || this.xhr.status === 200)
{
this.onResponse(this.xhr.response);
}
this.requestAborted = false;
}
}
/**
* Sends some data to the server via http request.
*/
send(buffer: ArrayBuffer): void
{
const path = this.parent.getPublicationPath();
if (!path)
{
console.error(`${getDateForLog()}: Pull: publication path is empty`);
return;
}
const xhr = new XMLHttpRequest();
xhr.open('POST', path);
xhr.send(buffer);
}
onResponse(response)
{
if (this.failureTimeout)
{
clearTimeout(this.failureTimeout);
this.failureTimeout = 0;
}
if (this.requestTimeout)
{
clearTimeout(this.requestTimeout);
this.requestTimeout = 0;
}
if (this.xhr.status === 200)
{
this.connected = true;
if (isNotEmptyString(response) || (response instanceof ArrayBuffer))
{
this.callbacks.onMessage(response);
}
else
{
this.parent.session.mid = null;
}
this.performRequest();
}
else if (this.xhr.status === 304)
{
this.connected = true;
if (this.xhr.getResponseHeader('Expires') === 'Thu, 01 Jan 1973 11:11:01 GMT')
{
const lastMessageId = this.xhr.getResponseHeader('Last-Message-Id');
if (isNotEmptyString(lastMessageId))
{
this.parent.setLastMessageId(lastMessageId);
}
}
this.performRequest();
}
else
{
this.callbacks.onError('Could not connect to the server');
this.connected = false;
}
}
}