friendica-github/bin/wait-for-connection

#!/usr/bin/php

<?php

/*
 * This script tries to connect to a database for a given interval
 * Useful in case of installation e.g. to wait for the database to not generate unnecessary errors
 *
 * Usage: php bin/wait-for-connection {HOST} {PORT} [{TIMEOUT}]
 */

$timeout = 60;
switch ($argc) {
	case 4:
		$timeout = (float)$argv[3];
	case 3:
		$host = $argv[1];
		$port = (int)$argv[2];
		break;
	default:
		fwrite(STDERR, 'Usage: '.$argv[0].' host port [timeout]'."\n");
		exit(2);
}
if ($timeout < 0) {
	fwrite(STDERR, 'Timeout must be greater than zero'."\n");
	exit(2);
}
if ($port < 1) {
	fwrite(STDERR, 'Port must be an integer greater than zero'."\n");
	exit(2);
}
$socketTimeout = (float)ini_get('default_socket_timeout');
if ($socketTimeout > $timeout) {
	$socketTimeout = $timeout;
}
$stopTime = time() + $timeout;
do {
	$sock = @fsockopen($host, $port, $errno, $errstr, $socketTimeout);
	if ($sock !== false) {
		fclose($sock);
		fwrite(STDOUT, "\n");
		exit(0);
	}
	sleep(1);
	fwrite(STDOUT, '.');
} while (time() < $stopTime);
fwrite(STDOUT, "\n");
exit(1);