add metrics

index.html

@@ -19,6 +19,7 @@
 			:root {
 				--background: #38383d;
 				--text: #ececec;
+				--text-alt: #868689;
 				--primary: #cc80ff;
 				--accent: #68b030;
 				::selection {
@@ -68,7 +69,20 @@
 					>adonis</a
 				>
 				runs a tor relay node and a snowflake proxy.<br />
-				this helps people stay anonymous and circumvent censorship.
+				this helps people stay anonymous and circumvent censorship:<br />
+				<span
+					style="
+						color: var(--accent);
+						font-weight: bolder;
+						text-decoration: underline;
+						text-decoration-color: var(--accent);
+					"
+					id="snowflake_conns"
+				></span>
+				<span style="color: var(--text-alt); font-weight: bolder"
+					>snowflake connections since last restart</span
+				>
+				<br />
 			</p>
 		</div>
 
@@ -95,4 +109,23 @@
 			></iframe>
 		</div>
 	</body>
+	<script>
+		async function fetchConnections() {
+			try {
+				const res = await fetch("https://tor.toufy.me/metrics.php", {
+					method: "GET",
+					headers: { Accept: "application/json" }
+				});
+				if (!res.ok) {
+					console.log(res);
+					snowflake_conns.innerHTML = 0;
+					return;
+				}
+				snowflake_conns.innerHTML = (await res.json()).snowflake_connections;
+			} catch (_) {
+				snowflake_conns.innerHTML = 0;
+			}
+		}
+		fetchConnections();
+	</script>
 </html>

metrics.php

@@ -0,0 +1,41 @@
+<?php
+
+header('Content-Type: application/json; charset=utf-8');
+
+if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
+    http_response_code(405);
+    header('Allow: GET');
+    echo json_encode(['error' => 'method not allowed']);
+    exit;
+}
+
+function get_snowflake_connections()
+{
+    $metric = 'tor_snowflake_proxy_connections_total';
+    $body = file_get_contents(
+        'http://127.0.0.1:9999/internal/metrics',
+        false
+    );
+    if (!$body) {
+        return 0;
+    }
+    $conns = 0;
+    foreach (preg_split('/\r\n|\n|\r/', $body) as $line) {
+        $line = trim($line);
+        if (!$line || $line[0] === '#')
+            continue;
+        if (preg_match(
+            '/^'
+                . preg_quote($metric, '/')
+                . '(?:\{[^}]*\})?\s+([0-9]+(?:\.[0-9]+)?)$/', $line, $m
+        )) {
+            $conns = $m[1];
+            break;
+        }
+    }
+    return $conns;
+}
+
+$snowflake_connections = get_snowflake_connections();
+
+echo json_encode(['snowflake_connections' => $snowflake_connections]);