From b573ff04e6aefcb9050da330408e757410ede53b Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 17 May 2022 16:34:06 +0200
Subject: [dnbd3] Show upload speed and client count in realtime

---
 modules-available/dnbd3/inc/dnbd3rpc.inc.php | 73 ++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

(limited to 'modules-available/dnbd3/inc')

diff --git a/modules-available/dnbd3/inc/dnbd3rpc.inc.php b/modules-available/dnbd3/inc/dnbd3rpc.inc.php
index 1a1e9f5c..9d7ba46c 100644
--- a/modules-available/dnbd3/inc/dnbd3rpc.inc.php
+++ b/modules-available/dnbd3/inc/dnbd3rpc.inc.php
@@ -82,4 +82,77 @@ class Dnbd3Rpc {
 		return $str;
 	}
 
+	/**
+	 * Get statistics for multiple servers at once.
+	 * @param string[] $servers
+	 * @return array
+	 */
+	public static function getStatsMulti(array $servers, int $timeout = 2): array
+	{
+		if (empty($servers))
+			return [];
+		$active = [];
+		$mh = curl_multi_init();
+		curl_multi_setopt($mh, CURLMOPT_MAXCONNECTS, 8);
+		curl_multi_setopt($mh, CURLMOPT_MAX_HOST_CONNECTIONS, 2);
+		curl_multi_setopt($mh, CURLMOPT_MAX_TOTAL_CONNECTIONS, 8);
+		foreach ($servers as $server) {
+			$url = 'http://' . self::translateServer($server) . '/query?q=stats';
+			$res = curl_init($url);
+			if ($res === false) {
+				error_log("curl_init($url) failed with $res");
+				continue;
+			}
+			curl_setopt_array($res, [
+				CURLOPT_CONNECTTIMEOUT => $timeout,
+				CURLOPT_TIMEOUT => $timeout,
+				CURLOPT_FOLLOWLOCATION => 0,
+				CURLOPT_ACCEPT_ENCODING => '', // Use everything libcurl supports
+				CURLOPT_PROTOCOLS => CURLPROTO_HTTP | CURLPROTO_HTTPS,
+				CURLOPT_RETURNTRANSFER => 1,
+			]);
+			$err = curl_multi_add_handle($mh, $res);
+			if ($err !== 0) {
+				error_log("curl_multi_add_handle() failed with $err");
+				curl_close($res);
+			} else {
+				$active[(int)$res] = $server;
+			}
+		}
+		// Wait
+		$running = 1;
+		$result = [];
+		$startTime = microtime(true);
+		for (;;) {
+			$ret = curl_multi_exec($mh, $running);
+			while (($info = curl_multi_info_read($mh)) !== false) {
+				if ($info['msg'] === CURLMSG_DONE) {
+					if (isset($active[(int)$info['handle']])) {
+						$server = $active[(int)$info['handle']];
+						unset($active[(int)$info['handle']]);
+						if ($info['result'] === CURLE_OK) {
+							$data = json_decode(curl_multi_getcontent($info['handle']), true);
+							if (is_array($data)) {
+								$data['ts'] = microtime(true);
+								$result[$server] = $data;
+							}
+						}
+					}
+					curl_multi_remove_handle($mh, $info['handle']);
+					curl_close($info['handle']);
+				}
+			}
+			$delay = ($startTime + $timeout) - microtime(true);
+			if ($ret !== CURLM_OK || !$running || $delay <= 0)
+				break;
+			$sret = curl_multi_select($mh, $delay);
+			if ($sret < 0) {
+				error_log("curl_multi_select returned $sret");
+				break;
+			}
+		}
+		curl_multi_close($mh);
+		return $result;
+	}
+
 }
-- 
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