Update to WS 6.x and fix all it broke

Significant update to the ws module to get it completely up to date.

The jump from 1.x to 6.x has required a rewrite of our WS handling. Most
specifically the means by which you can have multiple ws servers on a
single http server has completely changed; we now have to handle the
'upgrade' event on the server ourselves.

packages/node_modules/@node-red/nodes/core/io/22-websocket.js

@@ -18,6 +18,23 @@ module.exports = function(RED) {
     "use strict";
     var ws = require("ws");
     var inspect = require("util").inspect;
+    var url = require("url");
+
+    var serverUpgradeAdded = false;
+    function handleServerUpgrade(request, socket, head) {
+        const pathname = url.parse(request.url).pathname;
+        if (listenerNodes.hasOwnProperty(pathname)) {
+            listenerNodes[pathname].server.handleUpgrade(request, socket, head, function done(ws) {
+                listenerNodes[pathname].server.emit('connection', ws, request);
+            });
+        } else {
+            // Don't destroy the socket as other listeners may want to handle the
+            // event.
+        }
+    }
+    var listenerNodes = {};
+    var activeListenerNodes = 0;
+
 
     // A node red node that sets up a local websocket server
     function WebSocketListenerNode(n) {
@@ -53,13 +70,22 @@ module.exports = function(RED) {
 
         function handleConnection(/*socket*/socket) {
             var id = (1+Math.random()*4294967295).toString(16);
-            if (node.isServer) { node._clients[id] = socket; node.emit('opened',Object.keys(node._clients).length); }
+            if (node.isServer) {
+                node._clients[id] = socket;
+                node.emit('opened',Object.keys(node._clients).length);
+            }
             socket.on('open',function() {
-                if (!node.isServer) { node.emit('opened',''); }
+                if (!node.isServer) {
+                    node.emit('opened','');
+                }
             });
             socket.on('close',function() {
-                if (node.isServer) { delete node._clients[id]; node.emit('closed',Object.keys(node._clients).length); }
-                else { node.emit('closed'); }
+                if (node.isServer) {
+                    delete node._clients[id];
+                    node.emit('closed',Object.keys(node._clients).length);
+                } else {
+                    node.emit('closed');
+                }
                 if (!node.closing && !node.isServer) {
                     clearTimeout(node.tout);
                     node.tout = setTimeout(function() { startconn(); }, 3000); // try to reconnect every 3 secs... bit fast ?
@@ -78,34 +104,29 @@ module.exports = function(RED) {
         }
 
         if (node.isServer) {
-            var path = RED.settings.httpNodeRoot || "/";
-            path = path + (path.slice(-1) == "/" ? "":"/") + (node.path.charAt(0) == "/" ? node.path.substring(1) : node.path);
-
-            // Workaround https://github.com/einaros/ws/pull/253
-            // Listen for 'newListener' events from RED.server
-            node._serverListeners = {};
-
-            var storeListener = function(/*String*/event,/*function*/listener) {
-                if (event == "error" || event == "upgrade" || event == "listening") {
-                    node._serverListeners[event] = listener;
-                }
+            activeListenerNodes++;
+            if (!serverUpgradeAdded) {
+                RED.server.on('upgrade', handleServerUpgrade);
+                serverUpgradeAdded = true
             }
 
-            RED.server.addListener('newListener',storeListener);
+            var path = RED.settings.httpNodeRoot || "/";
+            path = path + (path.slice(-1) == "/" ? "":"/") + (node.path.charAt(0) == "/" ? node.path.substring(1) : node.path);
+            node.fullPath = path;
 
+            if (listenerNodes.hasOwnProperty(path)) {
+                node.error(RED._("websocket.errors.duplicate-path",{path: node.path}));
+                return;
+            }
+            listenerNodes[node.fullPath] = node;
             var serverOptions = {
-                server:RED.server,
-                path:path
+                noServer: true
             }
             if (RED.settings.webSocketNodeVerifyClient) {
                 serverOptions.verifyClient = RED.settings.webSocketNodeVerifyClient;
             }
             // Create a WebSocket Server
             node.server = new ws.Server(serverOptions);
-
-            // Workaround https://github.com/einaros/ws/pull/253
-            // Stop listening for new listener events
-            RED.server.removeListener('newListener',storeListener);
             node.server.setMaxListeners(0);
             node.server.on('connection', handleConnection);
         }
@@ -115,21 +136,17 @@ module.exports = function(RED) {
         }
 
         node.on("close", function() {
-            // Workaround https://github.com/einaros/ws/pull/253
-            // Remove listeners from RED.server
             if (node.isServer) {
-                var listener = null;
-                for (var event in node._serverListeners) {
-                    if (node._serverListeners.hasOwnProperty(event)) {
-                        listener = node._serverListeners[event];
-                        if (typeof listener === "function") {
-                            RED.server.removeListener(event,listener);
-                        }
-                    }
-                }
-                node._serverListeners = {};
+                delete listenerNodes[node.fullPath];
                 node.server.close();
                 node._inputNodes = [];
+                activeListenerNodes--;
+                if (activeListenerNodes === 0 && serverUpgradeAdded) {
+                    RED.server.removeListener('upgrade', handleServerUpgrade);
+                    serverUpgradeAdded = false;
+                }
+
+
             }
             else {
                 node.closing = true;
@@ -177,11 +194,12 @@ module.exports = function(RED) {
     }
 
     WebSocketListenerNode.prototype.broadcast = function(data) {
-        var i;
         try {
             if (this.isServer) {
-                for (i = 0; i < this.server.clients.length; i++) {
-                    this.server.clients[i].send(data);
+                for (let client in this._clients) {
+                    if (this._clients.hasOwnProperty(client)) {
+                        this._clients[client].send(data);
+                    }
                 }
             }
             else {
@@ -215,8 +233,11 @@ module.exports = function(RED) {
             this.serverConfig.on('opened', function(n) { node.status({fill:"green",shape:"dot",text:RED._("websocket.status.connected",{count:n})}); });
             this.serverConfig.on('erro', function() { node.status({fill:"red",shape:"ring",text:"common.status.error"}); });
             this.serverConfig.on('closed', function(n) {
-                if (n > 0) { node.status({fill:"green",shape:"dot",text:RED._("websocket.status.connected",{count:n})}); }
-                else { node.status({fill:"red",shape:"ring",text:"common.status.disconnected"}); }
+                if (n > 0) {
+                    node.status({fill:"green",shape:"dot",text:RED._("websocket.status.connected",{count:n})});
+                } else {
+                    node.status({fill:"red",shape:"ring",text:"common.status.disconnected"});
+                }
             });
         } else {
             this.error(RED._("websocket.errors.missing-conf"));

packages/node_modules/@node-red/nodes/locales/en-US/messages.json

@@ -432,7 +432,8 @@
         "errors": {
             "connect-error": "An error occured on the ws connection: ",
             "send-error": "An error occurred while sending: ",
-            "missing-conf": "Missing server configuration"
+            "missing-conf": "Missing server configuration",
+            "duplicate-path": "Cannot have two WebSocket listeners on the same path: __path__"
         }
     },
     "watch": {