767 lines
28 KiB
C#
767 lines
28 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Net;
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using System.Net.WebSockets;
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namespace Ooui
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{
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public static class UI
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{
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static readonly ManualResetEvent started = new ManualResetEvent (false);
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[ThreadStatic]
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static System.Security.Cryptography.SHA256 sha256;
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static CancellationTokenSource serverCts;
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static readonly Dictionary<string, RequestHandler> publishedPaths =
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new Dictionary<string, RequestHandler> ();
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static readonly Dictionary<string, Style> styles =
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new Dictionary<string, Style> ();
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static readonly StyleSelectors rules = new StyleSelectors ();
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public static StyleSelectors Styles => rules;
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static readonly byte[] clientJsBytes;
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static readonly string clientJsEtag;
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public static byte[] ClientJsBytes => clientJsBytes;
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public static string ClientJsEtag => clientJsEtag;
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public static string Template { get; set; } = $@"<!DOCTYPE html>
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<html>
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<head>
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<title>@Title</title>
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<meta name=""viewport"" content=""width=device-width, initial-scale=1"" />
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<link rel=""stylesheet"" href=""https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.7/css/bootstrap.min.css"" />
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<style>@Styles</style>
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</head>
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<body>
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<div id=""ooui-body"" class=""container-fluid""></div>
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<script src=""/ooui.js""></script>
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<script>ooui(""@WebSocketPath"");</script>
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</body>
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</html>";
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static string host = "*";
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public static string Host {
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get => host;
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set {
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if (!string.IsNullOrWhiteSpace (value) && host != value) {
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host = value;
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Restart ();
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}
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}
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}
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static int port = 8080;
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public static int Port {
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get => port;
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set {
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if (port != value) {
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port = value;
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Restart ();
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}
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}
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}
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static UI ()
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{
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var asm = typeof(UI).Assembly;
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// System.Console.WriteLine("ASM = {0}", asm);
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// foreach (var n in asm.GetManifestResourceNames()) {
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// System.Console.WriteLine(" {0}", n);
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// }
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using (var s = asm.GetManifestResourceStream ("Ooui.Client.js")) {
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if (s == null)
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throw new Exception ("Missing Client.js");
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using (var r = new StreamReader (s)) {
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clientJsBytes = Encoding.UTF8.GetBytes (r.ReadToEnd ());
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}
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}
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clientJsEtag = "\"" + Hash (clientJsBytes) + "\"";
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}
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static string Hash (byte[] bytes)
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{
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var sha = sha256;
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if (sha == null) {
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sha = System.Security.Cryptography.SHA256.Create ();
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sha256 = sha;
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}
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var data = sha.ComputeHash (bytes);
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StringBuilder sBuilder = new StringBuilder ();
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for (int i = 0; i < data.Length; i++) {
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sBuilder.Append (data[i].ToString ("x2"));
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}
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return sBuilder.ToString ();
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}
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static void Publish (string path, RequestHandler handler)
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{
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Console.WriteLine ($"PUBLISH {path} {handler}");
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lock (publishedPaths) publishedPaths[path] = handler;
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Start ();
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}
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public static void Publish (string path, Func<Element> elementCtor)
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{
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Publish (path, new ElementHandler (elementCtor));
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}
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public static void Publish (string path, Element element)
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{
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Publish (path, () => element);
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}
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public static void PublishFile (string filePath)
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{
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var path = "/" + System.IO.Path.GetFileName (filePath);
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PublishFile (path, filePath);
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}
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public static void PublishFile (string path, string filePath, string contentType = null)
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{
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var data = System.IO.File.ReadAllBytes (filePath);
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if (contentType == null) {
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contentType = GuessContentType (path, filePath);
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}
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Publish (path, new DataHandler (data, contentType));
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}
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public static void PublishJson (string path, Func<object> ctor)
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{
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Publish (path, new JsonHandler (ctor));
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}
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public static void PublishJson (string path, object value)
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{
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var data = JsonHandler.GetData (value);
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Publish (path, new DataHandler (data, JsonHandler.ContentType));
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}
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public static void PublishCustomResponse (string path, Action<HttpListenerContext, CancellationToken> responder)
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{
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Publish (path, new CustomHandler (responder));
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}
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static string GuessContentType (string path, string filePath)
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{
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return null;
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}
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public static void Present (string path, object presenter = null)
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{
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WaitUntilStarted ();
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var url = GetUrl (path);
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Console.WriteLine ($"PRESENT {url}");
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Platform.OpenBrowser (url, presenter);
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}
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public static string GetUrl (string path)
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{
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var localhost = host == "*" ? "localhost" : host;
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var url = $"http://{localhost}:{port}{path}";
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return url;
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}
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public static void WaitUntilStarted () => started.WaitOne ();
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static void Start ()
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{
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if (serverCts != null) return;
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serverCts = new CancellationTokenSource ();
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var token = serverCts.Token;
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var listenerPrefix = $"http://{host}:{port}/";
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Task.Run (() => RunAsync (listenerPrefix, token), token);
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}
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static void Stop ()
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{
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var scts = serverCts;
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if (scts == null) return;
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serverCts = null;
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started.Reset ();
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Console.ForegroundColor = ConsoleColor.Green;
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Console.WriteLine ($"Stopping...");
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Console.ResetColor ();
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scts.Cancel ();
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}
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static void Restart ()
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{
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if (serverCts == null) return;
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Stop ();
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Start ();
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}
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static async Task RunAsync (string listenerPrefix, CancellationToken token)
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{
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HttpListener listener = null;
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var wait = 5;
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started.Reset ();
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while (!started.WaitOne(0) && !token.IsCancellationRequested) {
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try {
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listener = new HttpListener ();
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listener.Prefixes.Add (listenerPrefix);
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listener.Start ();
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started.Set ();
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}
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catch (System.Net.Sockets.SocketException ex) {
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Console.WriteLine ($"{listenerPrefix} error: {ex.Message}. Trying again in {wait} seconds...");
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await Task.Delay (wait * 1000).ConfigureAwait (false);
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}
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catch (System.Net.HttpListenerException ex) {
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Console.WriteLine ($"{listenerPrefix} error: {ex.Message}. Trying again in {wait} seconds...");
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await Task.Delay (wait * 1000).ConfigureAwait (false);
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}
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catch (Exception ex) {
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Error ("Error listening", ex);
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return;
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}
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}
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Console.ForegroundColor = ConsoleColor.Green;
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Console.WriteLine ($"Listening at {listenerPrefix}...");
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Console.ResetColor ();
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while (!token.IsCancellationRequested) {
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var listenerContext = await listener.GetContextAsync ().ConfigureAwait (false);
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if (listenerContext.Request.IsWebSocketRequest) {
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ProcessWebSocketRequest (listenerContext, token);
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}
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else {
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ProcessRequest (listenerContext, token);
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}
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}
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}
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static void ProcessRequest (HttpListenerContext listenerContext, CancellationToken token)
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{
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var url = listenerContext.Request.Url;
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var path = url.LocalPath;
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Console.WriteLine ($"{listenerContext.Request.HttpMethod} {url.LocalPath}");
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var response = listenerContext.Response;
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if (path == "/ooui.js") {
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var inm = listenerContext.Request.Headers.Get ("If-None-Match");
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if (string.IsNullOrEmpty (inm) || inm != clientJsEtag) {
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response.StatusCode = 200;
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response.ContentLength64 = clientJsBytes.LongLength;
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response.ContentType = "application/javascript";
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response.ContentEncoding = Encoding.UTF8;
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response.AddHeader ("Cache-Control", "public, max-age=60");
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response.AddHeader ("Etag", clientJsEtag);
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using (var s = response.OutputStream) {
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s.Write (clientJsBytes, 0, clientJsBytes.Length);
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}
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response.Close ();
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}
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else {
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response.StatusCode = 304;
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response.Close ();
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}
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}
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else {
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var found = false;
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RequestHandler handler;
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lock (publishedPaths) found = publishedPaths.TryGetValue (path, out handler);
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if (found) {
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try {
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handler.Respond (listenerContext, token);
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}
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catch (Exception ex) {
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Error ("Handler failed to respond", ex);
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try {
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response.StatusCode = 500;
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response.Close ();
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}
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catch {
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// Ignore ending the response errors
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}
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}
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}
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else {
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response.StatusCode = 404;
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response.Close ();
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}
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}
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}
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abstract class RequestHandler
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{
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public abstract void Respond (HttpListenerContext listenerContext, CancellationToken token);
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}
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class ElementHandler : RequestHandler
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{
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readonly Lazy<Element> element;
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public ElementHandler (Func<Element> ctor)
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{
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element = new Lazy<Element> (ctor);
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}
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public Element GetElement () => element.Value;
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public override void Respond (HttpListenerContext listenerContext, CancellationToken token)
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{
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var url = listenerContext.Request.Url;
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var path = url.LocalPath;
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var response = listenerContext.Response;
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response.StatusCode = 200;
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response.ContentType = "text/html";
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response.ContentEncoding = Encoding.UTF8;
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var html = Encoding.UTF8.GetBytes (RenderTemplate (path));
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response.ContentLength64 = html.LongLength;
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using (var s = response.OutputStream) {
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s.Write (html, 0, html.Length);
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}
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response.Close ();
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}
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}
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public static string RenderTemplate (string webSocketPath, string title = "")
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{
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return Template.Replace ("@WebSocketPath", webSocketPath).Replace ("@Styles", rules.ToString ()).Replace ("@Title", title);
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}
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class DataHandler : RequestHandler
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{
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readonly byte[] data;
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readonly string contentType;
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public DataHandler (byte[] data, string contentType = null)
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{
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this.data = data;
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this.contentType = contentType;
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}
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public override void Respond (HttpListenerContext listenerContext, CancellationToken token)
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{
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var url = listenerContext.Request.Url;
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var path = url.LocalPath;
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var response = listenerContext.Response;
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response.StatusCode = 200;
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if (!string.IsNullOrEmpty (contentType))
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response.ContentType = contentType;
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response.ContentLength64 = data.LongLength;
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using (var s = response.OutputStream) {
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s.Write (data, 0, data.Length);
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}
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response.Close ();
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}
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}
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class JsonHandler : RequestHandler
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{
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public const string ContentType = "application/json; charset=utf-8";
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readonly Func<object> ctor;
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public JsonHandler (Func<object> ctor)
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{
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this.ctor = ctor;
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}
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public static byte[] GetData (object obj)
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{
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var r = Newtonsoft.Json.JsonConvert.SerializeObject (obj);
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return System.Text.Encoding.UTF8.GetBytes (r);
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}
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public override void Respond (HttpListenerContext listenerContext, CancellationToken token)
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{
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var response = listenerContext.Response;
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var data = GetData (ctor ());
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response.StatusCode = 200;
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response.ContentType = ContentType;
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response.ContentLength64 = data.LongLength;
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using (var s = response.OutputStream) {
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s.Write (data, 0, data.Length);
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}
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response.Close ();
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}
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}
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class CustomHandler : RequestHandler
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{
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readonly Action<HttpListenerContext, CancellationToken> responder;
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public CustomHandler (Action<HttpListenerContext, CancellationToken> responder)
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{
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this.responder = responder;
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}
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public override void Respond (HttpListenerContext listenerContext, CancellationToken token)
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{
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responder (listenerContext, token);
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}
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}
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static async void ProcessWebSocketRequest (HttpListenerContext listenerContext, CancellationToken serverToken)
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{
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//
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// Find the element
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//
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var url = listenerContext.Request.Url;
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var path = url.LocalPath;
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RequestHandler handler;
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var found = false;
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lock (publishedPaths) found = publishedPaths.TryGetValue (path, out handler);
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var elementHandler = handler as ElementHandler;
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if (!found || elementHandler == null) {
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listenerContext.Response.StatusCode = 404;
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listenerContext.Response.Close ();
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return;
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}
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Element element = null;
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try {
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element = elementHandler.GetElement ();
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if (element == null)
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throw new Exception ("Handler returned a null element");
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}
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catch (Exception ex) {
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listenerContext.Response.StatusCode = 500;
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listenerContext.Response.Close();
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Error ("Failed to create element", ex);
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return;
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}
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//
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// Connect the web socket
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//
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WebSocketContext webSocketContext = null;
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WebSocket webSocket = null;
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try {
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webSocketContext = await listenerContext.AcceptWebSocketAsync (subProtocol: "ooui").ConfigureAwait (false);
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webSocket = webSocketContext.WebSocket;
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Console.WriteLine ("WEBSOCKET {0}", listenerContext.Request.Url.LocalPath);
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}
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catch (Exception ex) {
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listenerContext.Response.StatusCode = 500;
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listenerContext.Response.Close();
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Error ("Failed to accept WebSocket", ex);
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return;
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}
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//
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// Set the element's dimensions
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//
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var query =
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(from part in listenerContext.Request.Url.Query.Split (new[] { '?', '&' })
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where part.Length > 0
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let kvs = part.Split ('=')
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where kvs.Length == 2
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select kvs).ToDictionary (x => Uri.UnescapeDataString (x[0]), x => Uri.UnescapeDataString (x[1]));
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if (!query.TryGetValue ("w", out var wValue) || string.IsNullOrEmpty (wValue)) {
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wValue = "640";
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}
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if (!query.TryGetValue ("h", out var hValue) || string.IsNullOrEmpty (hValue)) {
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hValue = "480";
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}
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var icult = System.Globalization.CultureInfo.InvariantCulture;
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if (!double.TryParse (wValue, System.Globalization.NumberStyles.Any, icult, out var w))
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w = 640;
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if (!double.TryParse (hValue, System.Globalization.NumberStyles.Any, icult, out var h))
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h = 480;
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//
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// Create a new session and let it handle everything from here
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//
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try {
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var session = new Session (webSocket, element, w, h, serverToken);
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await session.RunAsync ().ConfigureAwait (false);
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}
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catch (WebSocketException ex) when (ex.WebSocketErrorCode == WebSocketError.ConnectionClosedPrematurely) {
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// The remote party closed the WebSocket connection without completing the close handshake.
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}
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catch (Exception ex) {
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Error ("Web socket failed", ex);
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}
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finally {
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webSocket?.Dispose ();
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}
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}
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static void Error (string message, Exception ex)
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{
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Console.ForegroundColor = ConsoleColor.Red;
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Console.WriteLine ("{0}: {1}", message, ex);
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Console.ResetColor ();
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}
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public class Session
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{
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readonly WebSocket webSocket;
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readonly Element element;
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readonly Action<Message> handleElementMessageSent;
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readonly CancellationTokenSource sessionCts = new CancellationTokenSource ();
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readonly CancellationTokenSource linkedCts;
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readonly CancellationToken token;
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readonly HashSet<string> createdIds;
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readonly List<Message> queuedMessages = new List<Message> ();
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readonly System.Timers.Timer sendThrottle;
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DateTime lastTransmitTime = DateTime.MinValue;
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readonly TimeSpan throttleInterval = TimeSpan.FromSeconds (1.0 / 30); // 30 FPS max
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readonly double initialWidth;
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readonly double initialHeight;
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public Session (WebSocket webSocket, Element element, double initialWidth, double initialHeight, CancellationToken serverToken)
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{
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this.webSocket = webSocket;
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this.element = element;
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this.initialWidth = initialWidth;
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this.initialHeight = initialHeight;
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//
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// Create a new session cancellation token that will trigger
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// automatically if the server shutsdown or the session shutsdown.
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//
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linkedCts = CancellationTokenSource.CreateLinkedTokenSource (serverToken, sessionCts.Token);
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token = linkedCts.Token;
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//
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// Keep a list of all the elements for which we've transmitted the initial state
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//
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createdIds = new HashSet<string> {
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"window",
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"document",
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"document.body",
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};
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//
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// Preparse handlers for the element
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//
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handleElementMessageSent = QueueMessage;
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//
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// Create a timer to use as a throttle when sending messages
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//
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sendThrottle = new System.Timers.Timer (throttleInterval.TotalMilliseconds);
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sendThrottle.Elapsed += (s, e) => {
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// System.Console.WriteLine ("TICK SEND THROTTLE FOR {0}", element);
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if ((e.SignalTime - lastTransmitTime) >= throttleInterval) {
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sendThrottle.Enabled = false;
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lastTransmitTime = e.SignalTime;
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TransmitQueuedMessages ();
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}
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};
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|
}
|
|
|
|
public async Task RunAsync ()
|
|
{
|
|
//
|
|
// Start watching for changes in the element
|
|
//
|
|
element.MessageSent += handleElementMessageSent;
|
|
|
|
try {
|
|
//
|
|
// Add it to the document body
|
|
//
|
|
if (element.WantsFullScreen) {
|
|
element.Style.Width = initialWidth;
|
|
element.Style.Height = initialHeight;
|
|
}
|
|
QueueMessage (Message.Call ("document.body", "appendChild", element));
|
|
|
|
//
|
|
// Start the Read Loop
|
|
//
|
|
var receiveBuffer = new byte[64*1024];
|
|
|
|
while (webSocket.State == WebSocketState.Open && !token.IsCancellationRequested) {
|
|
var receiveResult = await webSocket.ReceiveAsync(new ArraySegment<byte>(receiveBuffer), token).ConfigureAwait (false);
|
|
|
|
if (receiveResult.MessageType == WebSocketMessageType.Close) {
|
|
await webSocket.CloseAsync (WebSocketCloseStatus.NormalClosure, "", token).ConfigureAwait (false);
|
|
sessionCts.Cancel ();
|
|
}
|
|
else if (receiveResult.MessageType == WebSocketMessageType.Binary) {
|
|
await webSocket.CloseAsync (WebSocketCloseStatus.InvalidMessageType, "Cannot accept binary frame", token).ConfigureAwait (false);
|
|
sessionCts.Cancel ();
|
|
}
|
|
else {
|
|
var size = receiveResult.Count;
|
|
while (!receiveResult.EndOfMessage) {
|
|
if (size >= receiveBuffer.Length) {
|
|
await webSocket.CloseAsync (WebSocketCloseStatus.MessageTooBig, "Message too big", token).ConfigureAwait (false);
|
|
return;
|
|
}
|
|
receiveResult = await webSocket.ReceiveAsync (new ArraySegment<byte>(receiveBuffer, size, receiveBuffer.Length - size), token).ConfigureAwait (false);
|
|
size += receiveResult.Count;
|
|
}
|
|
var receivedString = Encoding.UTF8.GetString (receiveBuffer, 0, size);
|
|
|
|
try {
|
|
// Console.WriteLine ("RECEIVED: {0}", receivedString);
|
|
var message = Newtonsoft.Json.JsonConvert.DeserializeObject<Message> (receivedString);
|
|
element.Receive (message);
|
|
}
|
|
catch (Exception ex) {
|
|
Error ("Failed to process received message", ex);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
finally {
|
|
element.MessageSent -= handleElementMessageSent;
|
|
}
|
|
}
|
|
|
|
void QueueStateMessagesLocked (EventTarget target)
|
|
{
|
|
if (target == null) return;
|
|
var created = false;
|
|
foreach (var m in target.StateMessages) {
|
|
if (m.MessageType == MessageType.Create) {
|
|
createdIds.Add (m.TargetId);
|
|
created = true;
|
|
}
|
|
if (created) {
|
|
QueueMessageLocked (m);
|
|
}
|
|
}
|
|
}
|
|
|
|
void QueueMessageLocked (Message message)
|
|
{
|
|
//
|
|
// Make sure all the referenced objects have been created
|
|
//
|
|
if (!createdIds.Contains (message.TargetId)) {
|
|
QueueStateMessagesLocked (element.GetElementById (message.TargetId));
|
|
}
|
|
if (message.Value is EventTarget ve) {
|
|
if (!createdIds.Contains (ve.Id)) {
|
|
QueueStateMessagesLocked (ve);
|
|
}
|
|
}
|
|
else if (message.Value is Array a) {
|
|
for (var i = 0; i < a.Length; i++) {
|
|
// Console.WriteLine ($"A{i} = {a.GetValue(i)}");
|
|
if (a.GetValue (i) is EventTarget e && !createdIds.Contains (e.Id)) {
|
|
QueueStateMessagesLocked (e);
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Add it to the queue
|
|
//
|
|
//Console.WriteLine ($"QM {message.MessageType} {message.TargetId} {message.Key} {message.Value}");
|
|
queuedMessages.Add (message);
|
|
}
|
|
|
|
void QueueMessage (Message message)
|
|
{
|
|
lock (queuedMessages) {
|
|
QueueMessageLocked (message);
|
|
}
|
|
sendThrottle.Enabled = true;
|
|
}
|
|
|
|
async void TransmitQueuedMessages ()
|
|
{
|
|
try {
|
|
//
|
|
// Dequeue as many messages as we can
|
|
//
|
|
var messagesToSend = new List<Message> ();
|
|
System.Runtime.CompilerServices.ConfiguredTaskAwaitable task;
|
|
lock (queuedMessages) {
|
|
messagesToSend.AddRange (queuedMessages);
|
|
queuedMessages.Clear ();
|
|
|
|
if (messagesToSend.Count == 0)
|
|
return;
|
|
|
|
//
|
|
// Now actually send this message
|
|
// Do this while locked to make sure SendAsync is called in the right order
|
|
//
|
|
var json = Newtonsoft.Json.JsonConvert.SerializeObject (messagesToSend);
|
|
var outputBuffer = new ArraySegment<byte> (Encoding.UTF8.GetBytes (json));
|
|
//Console.WriteLine ("TRANSMIT " + json);
|
|
task = webSocket.SendAsync (outputBuffer, WebSocketMessageType.Text, true, token).ConfigureAwait (false);
|
|
}
|
|
await task;
|
|
}
|
|
catch (Exception ex) {
|
|
Error ("Failed to send queued messages, aborting session", ex);
|
|
element.MessageSent -= handleElementMessageSent;
|
|
sessionCts.Cancel ();
|
|
}
|
|
}
|
|
}
|
|
|
|
public class StyleSelectors
|
|
{
|
|
public Style this[string selector] {
|
|
get {
|
|
var key = selector ?? "";
|
|
lock (styles) {
|
|
if (!styles.TryGetValue (key, out Style r)) {
|
|
r = new Style ();
|
|
styles.Add (key, r);
|
|
}
|
|
return r;
|
|
}
|
|
}
|
|
set {
|
|
var key = selector ?? "";
|
|
lock (styles) {
|
|
if (value == null) {
|
|
styles.Remove (key);
|
|
}
|
|
else {
|
|
styles[key] = value;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public void Clear ()
|
|
{
|
|
lock (styles) {
|
|
styles.Clear ();
|
|
}
|
|
}
|
|
|
|
public override string ToString()
|
|
{
|
|
lock (styles) {
|
|
var q =
|
|
from s in styles
|
|
let v = s.Value.ToString ()
|
|
where v.Length > 0
|
|
select s.Key + " {" + s.Value.ToString () + "}";
|
|
return String.Join ("\n", q);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|