b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
63 lines
1.7 KiB
JavaScript
Executable file
63 lines
1.7 KiB
JavaScript
Executable file
'use strict';
|
|
var debug = require('debug')('socket-retry-connect'),
|
|
net = require('net');
|
|
|
|
var MAX_TRIES = 10;
|
|
var WAIT_BETWEEN_TRIES_MS = 250;
|
|
|
|
/**
|
|
* Tries to connect to a given socket location.
|
|
* Time between retires grows in relation to attempts (attempt * RETRY_TIMER).
|
|
*
|
|
* waitForSocket({ port: 2828, maxTries: 10 }, function(err, socket) {
|
|
* });
|
|
*
|
|
* Note- there is a third argument used to recursion that should
|
|
* never be used publicly.
|
|
*
|
|
* Options:
|
|
* - (Number) port: to connect to.
|
|
* - (String) host: to connect to.
|
|
* - (Number) tries: number of times to attempt the connect.
|
|
*
|
|
* @param {Object} options for connection.
|
|
* @param {Function} callback [err, socket].
|
|
*/
|
|
function waitForSocket(options, callback, _tries) {
|
|
if (!options.port)
|
|
throw new Error('.port is a required option');
|
|
|
|
var maxTries = options.tries || MAX_TRIES;
|
|
var host = options.host || 'localhost';
|
|
var port = options.port;
|
|
|
|
|
|
debug('attempt to open socket', port, host);
|
|
_tries = _tries || 0;
|
|
if (_tries >= maxTries)
|
|
return callback(new Error('cannot open socket'));
|
|
|
|
function handleError() {
|
|
debug('socket is not ready trying');
|
|
// retry connection
|
|
setTimeout(
|
|
waitForSocket,
|
|
// wait at least WAIT_BETWEEN_TRIES_MS or a multiplier
|
|
// of the attempts.
|
|
(WAIT_BETWEEN_TRIES_MS * _tries) || WAIT_BETWEEN_TRIES_MS,
|
|
options,
|
|
callback,
|
|
++_tries
|
|
);
|
|
}
|
|
|
|
var socket = net.connect(port, host, function(one, two) {
|
|
debug('connected', port, host);
|
|
socket.removeListener('error', handleError);
|
|
callback(null, socket);
|
|
});
|
|
socket.once('error', handleError);
|
|
}
|
|
|
|
module.exports.waitForSocket = waitForSocket;
|
|
|