Adding ServerSentEvents

samples/SocketsSample/wwwroot/hubs.html

@@ -8,7 +8,8 @@
         document.addEventListener('DOMContentLoaded', () => {
             let connectButton = document.getElementById('connect');
             let connection = new RpcConnection(`http://${document.location.host}/hubs`, 'formatType=json&format=text');
-            connection.on('Send',(msg) => { addLine(msg); });
+            connection.on('Send', msg => {
+                addLine(msg); });
             let isConnected = false;
 
             connectButton.addEventListener('click', () => {

src/Microsoft.AspNetCore.SignalR.Client.TS/LongPollingTransport.ts

@@ -9,13 +9,13 @@ class LongPollingTransport implements ITransport {
     // TODO: string won't work for binary formats
     constructor(receiveCallback: (data: string) => void) {
          this.receiveCallback = receiveCallback;
-         this.pollXhr = new XMLHttpRequest();
     }
 
     connect(url: string, queryString: string): Promise<void> {
         this.queryString = queryString || "";
         this.url = url || "";
 
+        this.pollXhr = new XMLHttpRequest();
         // TODO: resolve promise on open sending? + reject on error
         this.poll(url + "/poll?" + this.queryString)
         return Promise.resolve();

src/Microsoft.AspNetCore.SignalR.Client.TS/RpcConnection.ts

@@ -51,17 +51,19 @@ class RpcConnection {
     start(): Promise<void> {
         return new Promise((resolve, reject) => {
             new HttpClient().get(this.url + "/getid?" + this.queryString)
-            .then(id => {
+                .then(id => {
-                // this.transport = new WebSocketTransport(data => this.messageReceived(data));
+                    this.transport = new ServerSentEventsTransport(data => this.messageReceived(data));
-                this.transport = new LongPollingTransport(data => this.messageReceived(data));
+                    // this.transport = new WebSocketTransport(data => this.messageReceived(data));
-                return this.transport.connect(this.url, `id=${id}&${this.queryString}`);
+                    // this.transport = new WebSocketTransport(data => this.messageReceived(data));
-            })
+                    // this.transport = new LongPollingTransport(data => this.messageReceived(data));
-            .then(() => {
+                    return this.transport.connect(this.url, `id=${id}&${this.queryString}`);
-                resolve();
+                })
-            })
+                .then(() => {
-            .catch(() => {
+                    resolve();
-                reject();
+                })
-            });
+                .catch(e => {
+                    reject(e);
+                });
         });
     }
 

src/Microsoft.AspNetCore.SignalR.Client.TS/ServerSentEventsTransport.ts

@@ -0,0 +1,33 @@
+// TODO: need EvenSource typings
+
+class ServerSentEventsTransport implements ITransport {
+    private receiveCallback: (data: string) => void;
+    private eventSource: EventSource;
+    private url: string;
+    private queryString: string;
+
+    constructor(receiveCallback: (data: string) => void) {
+         this.receiveCallback = receiveCallback;
+    }
+
+    connect(url: string, queryString: string): Promise<void> {
+        this.queryString = queryString || "";
+        this.url = url || "";
+        let tmp = `${this.url}/sse?${this.queryString}`;
+        this.eventSource = new EventSource(`${this.url}/sse?${this.queryString}`);
+        this.eventSource.onmessage = e => {
+            this.receiveCallback(e.data);
+        };
+
+        //TODO: handle errors
+        return Promise.resolve();
+    }
+
+    send(data: string): Promise<void> {
+        return new HttpClient().post(this.url + "/send?" + this.queryString, data);
+    }
+
+    stop(): void {
+        this.eventSource.close();
+    }
+}

src/Microsoft.AspNetCore.Sockets/HttpConnectionDispatcher.cs

@@ -47,6 +47,10 @@ namespace Microsoft.AspNetCore.Sockets
                     state.Connection.Metadata["transport"] = "sse";
                     state.Connection.Metadata.Format = format;
 
+                    // TODO: this is wrong. + how does the user add their own metadata based on HttpContext
+                    var formatType = (string)context.Request.Query["formatType"];
+                    state.Connection.Metadata["formatType"] = string.IsNullOrEmpty(formatType) ? "json" : formatType;
+
                     var sse = new ServerSentEvents(state.Connection);
 
                     await DoPersistentConnection(endpoint, sse, context, state.Connection);