add signalr support

Controllers/ApiController.cs

@@ -1,36 +0,0 @@
-using BinaryDad.Notes.Services;
-using Microsoft.AspNetCore.Mvc;
-
-namespace BinaryDad.Notes.Controllers;
-
-[ApiController]
-[Route("[controller]")]
-public class ApiController : ControllerBase
-{
-    private readonly INoteService noteService;
-
-    public ApiController(INoteService noteService)
-    {
-        this.noteService = noteService;
-    }
-
-    [HttpGet]
-    [Route("get")]
-    public string Get() => noteService.Get();
-
-    [HttpPost]
-    [Route("save")]
-    public async Task<bool> Save()
-    {
-        var content = string.Empty;
-
-        using (var reader = new StreamReader(Request.Body))
-        {
-            content = await reader.ReadToEndAsync();
-        }
-
-        noteService.Save(content);
-
-        return true;
-    }
-}

NoteHub.cs

@@ -0,0 +1,22 @@
+using BinaryDad.Notes.Services;
+using Microsoft.AspNetCore.SignalR;
+
+namespace BinaryDad.Notes
+{
+    public class NoteHub : Hub
+    {
+        private readonly INoteService noteService;
+
+        public NoteHub(INoteService noteService)
+        {
+            this.noteService = noteService;
+        }
+
+        public async Task SaveNote(string content)
+        {
+            noteService.Save(content);
+
+            await Clients.Others.SendAsync("updateNote", content);
+        }
+    }
+}

Program.cs

@@ -1,9 +1,11 @@
+using BinaryDad.Notes;
 using BinaryDad.Notes.Services;
 
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
 builder.Services.AddControllersWithViews();
+builder.Services.AddSignalR();
 builder.Services.AddSingleton<INoteService, FileNoteService>();
 
 var app = builder.Build();
@@ -24,4 +26,6 @@ app.MapControllerRoute(
     name: "default",
     pattern: "{controller=Home}/{action=Index}/{id?}");
 
+app.MapHub<NoteHub>("/noteHub");
+
 app.Run();

Views/Home/Index.cshtml

@@ -5,4 +5,5 @@
 
 <textarea id="content" name="content" spellcheck="false">@Model</textarea>
 
-<div id="saved-indicator">Saved!</div>
+<div class="toast" id="saved-indicator">Saved!</div>
+<div class="toast" id="update-indicator">Updated!</div>

Views/Shared/_Layout.cshtml

@@ -12,6 +12,7 @@
     @RenderBody()
 
     <script src="~/lib/jquery/dist/jquery.min.js"></script>
+    <script src="~/lib/signalr/dist/browser/signalr.min.js"></script>
     <script src="~/js/site.js" asp-append-version="true"></script>
     @await RenderSectionAsync("Scripts", required: false)
 </body>

libman.json

@@ -0,0 +1,13 @@
+{
+  "version": "1.0",
+  "defaultProvider": "unpkg",
+  "libraries": [
+    {
+      "library": "@microsoft/signalr@latest",
+      "destination": "wwwroot/lib/signalr/",
+      "files": [
+        "dist/browser/signalr.min.js"
+      ]
+    }
+  ]
+}

wwwroot/css/site.css

@@ -28,7 +28,7 @@ textarea {
     resize: none;
     color: #444;
     font-size: 12px;
-    font-family: Consolas;
+    font-family: Consolas, 'Courier New';
     outline: none;
     position: absolute;
     box-sizing: border-box;
@@ -40,18 +40,25 @@ textarea {
         color: #ddd;
     }
 
-#saved-indicator {
+.toast {
     position: fixed;
     bottom: -40px;
     right: 20px;
     font-size: 12px;
-    background-color: green;
     padding: 10px;
     border-radius: 10px 10px 0 0;
     color: #fff;
     transition: bottom 0.2s;
 }
 
-    #saved-indicator.show {
+    .toast.show {
         bottom: 0;
     }
+
+#saved-indicator {
+    background-color: green;
+}
+
+#update-indicator {
+    background-color: orangered;
+}

wwwroot/js/site.js

@@ -1,38 +1,53 @@
-let saveContent = function ($textarea) {
+let connection = new signalR.HubConnectionBuilder().withUrl("/noteHub").build();
+
+connection.start().then(function () {
+    console.log('Started websocket listener');
+}).catch(function (err) {
+    return console.error(err.toString());
+});
+
+let showToast = function (selector) {
+
+    const cssClass = 'show';
+
+    // show 'saved' indicator
+    $(selector).addClass(cssClass).delay(800).queue(function (next) {
+        $(this).removeClass(cssClass);
+        next();
+    });
+}
+
+let saveContent = function ($textarea) {
     $textarea = $textarea || $('textarea');
 
     var content = $textarea.val();
 
-    $.ajax('/api/save', {
-        data: content,
-        contentType: 'text/plain',
-        type: 'POST'
-    }).done(function (data) {
-
-        // show 'saved' indicator
-        $('#saved-indicator').addClass('show').delay(800).queue(function (next) {
-            $(this).removeClass('show');
-            next();
-        });
-
-    }).fail(function () {
-        alert('Could not connect to server. Check your internet connection and try again.');
+    connection.invoke('SaveNote', content).then(function () {
+        showToast('#saved-indicator');
     });
 };
 
 $(function () {
 
+    let $textarea = $('textarea');
+
+    // update content upon sync save
+    connection.on('updateNote', function (content) {
+        $textarea.val(content);
+        showToast('#update-indicator');
+    });
+
     // set dark mode
     if (window.location.hash == '#dark') {
-        $('textarea').addClass('dark');
+        $textarea.addClass('dark');
     }
 
     var timer = null;
-    
+
     let ignoredKeyCodes = [17, 18, 20, 27, 37, 38, 39, 40, 91];
 
     // save after a second delay after typing
-    $('textarea').keyup(function (e) {
+    $textarea.keyup(function (e) {
 
         clearTimeout(timer);
 
@@ -46,7 +61,7 @@ $(function () {
     });
 
     // support tab key in textarea
-    $('textarea').keydown(function (e) {
+    $textarea.keydown(function (e) {
         if (e.keyCode === 9) { // tab was pressed
             // get caret position/selection
             var start = this.selectionStart;
@@ -66,5 +81,4 @@ $(function () {
             return false;
         }
     });
-
 });