Fix streaming using deprecated url.parse instead of WHATWG URL API

Removes [DEP0169] DeprecationWarning from the startup logs.

streaming/index.js

@@ -91,6 +91,33 @@ const parseJSON = (json, req) => {
   }
 };
 
+/**
+ * Parses the query string from a request object.
+ * @param {Request?} req
+ * @returns {Record<string, string | string[]> | undefined}
+ */
+const parseQueryString = (req) => {
+  if (!req.url) {
+    return undefined;
+  }
+  const url = new URL(req.url, "http:.");
+  const params = Array.from(url.searchParams);
+  return params.reduce((parsed, [key, value]) => {
+    if (parsed.hasOwnProperty(key)) {
+      if (Array.isArray(parsed[key])) {
+        parsed[key].push(value);
+      }
+      else {
+        parsed[key] = [parsed[key], value];
+      }
+    }
+    else {
+      parsed[key] = value;
+    }
+    return parsed;
+  }, {});
+}
+
 // Used for priming the counters/gauges for the various metrics that are
 // per-channel
 const CHANNEL_NAMES = [
@@ -391,8 +418,8 @@ const startServer = async () => {
    */
   const accountFromRequest = (req) => new Promise((resolve, reject) => {
     const authorization = req.headers.authorization;
-    const location      = req.url ? url.parse(req.url, true) : undefined;
+    const query         = parseQueryString(req);
-    const accessToken   = location?.query.access_token || req.headers['sec-websocket-protocol'];
+    const accessToken   = query?.access_token || req.headers['sec-websocket-protocol'];
 
     if (!authorization && !accessToken) {
       reject(new AuthenticationError('Missing access token'));
@@ -1298,8 +1325,8 @@ const startServer = async () => {
    * @param {import('pino').Logger} log
    */
   function onConnection(ws, req, log) {
-    // Note: url.parse could throw, which would terminate the connection, so we
+    // In case the handler throws, which would terminate the connection,
-    // increment the connected clients metric straight away when we establish
+    // increment the connected clients metric straight away when it establishes
     // the connection, without waiting:
     metrics.connectedClients.labels({ type: 'websocket' }).inc();
 
@@ -1381,11 +1408,10 @@ const startServer = async () => {
 
     subscribeWebsocketToSystemChannel(session);
 
-    // Parse the URL for the connection arguments (if supplied), url.parse can throw:
+    // Parse the URL for the connection arguments (if supplied)
-    const location = req.url && url.parse(req.url, true);
+    const query = parseQueryString(req);
-
+    if (query && query.stream) {
-    if (location && location.query.stream) {
+      subscribeWebsocketToChannel(session, firstParam(query.stream), query);
-      subscribeWebsocketToChannel(session, firstParam(location.query.stream), location.query);
     }
   }