2017-06-12 22:17:23 +00:00
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using System;
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2017-06-12 23:24:40 +00:00
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using System.Collections.Generic;
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using System.IO;
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2017-06-12 22:17:23 +00:00
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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 class Server
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{
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2017-06-12 23:24:40 +00:00
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readonly Dictionary<string, Func<Element>> publishedPaths =
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new Dictionary<string, Func<Element>> ();
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2017-06-13 01:24:30 +00:00
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readonly static byte[] clientJsBytes;
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static Server ()
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{
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var asm = typeof(Server).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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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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}
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2017-06-12 22:17:23 +00:00
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public Task RunAsync (string listenerPrefix)
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{
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return RunAsync (listenerPrefix, CancellationToken.None);
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}
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public async Task RunAsync (string listenerPrefix, CancellationToken token)
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{
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var listener = new HttpListener ();
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listener.Prefixes.Add (listenerPrefix);
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listener.Start ();
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Console.WriteLine ($"Listening at {listenerPrefix}...");
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while (!token.IsCancellationRequested) {
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2017-06-12 23:24:40 +00:00
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var listenerContext = await listener.GetContextAsync ().ConfigureAwait (false);
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2017-06-12 22:17:23 +00:00
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if (listenerContext.Request.IsWebSocketRequest) {
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ProcessWebSocketRequest (listenerContext, token);
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}
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else {
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2017-06-12 23:24:40 +00:00
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ProcessRequest (listenerContext, token);
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}
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}
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}
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public void Publish (string path, Func<Element> elementCtor)
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{
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System.Console.WriteLine($"PUBLISH {path}");
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publishedPaths[path] = elementCtor;
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}
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public 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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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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2017-06-13 01:24:30 +00:00
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var response = listenerContext.Response;
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2017-06-12 23:24:40 +00:00
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Func<Element> ctor;
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2017-06-13 01:24:30 +00:00
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if (path == "/client.js") {
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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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2017-06-13 01:37:41 +00:00
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response.AddHeader ("Cache-Control", "public, max-age=3600");
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2017-06-13 01:24:30 +00:00
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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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}
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else if (publishedPaths.TryGetValue (path, out ctor)) {
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2017-06-12 23:24:40 +00:00
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var element = ctor ();
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RegisterElement (element);
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2017-06-13 01:24:30 +00:00
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WriteElementHtml (element, response);
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2017-06-12 23:24:40 +00:00
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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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2017-06-12 23:24:40 +00:00
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}
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}
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void RegisterElement (Element element)
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{
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}
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void WriteElementHtml (Element element, HttpListenerResponse response)
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{
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response.StatusCode = 200;
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2017-06-13 01:24:30 +00:00
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response.ContentType = "text/html";
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response.ContentEncoding = Encoding.UTF8;
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2017-06-13 01:37:41 +00:00
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var html = Encoding.UTF8.GetBytes ($@"<html>
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<head><title>{element}</title></head>
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<body><script src=""/client.js""> </script></body>
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</html>");
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response.ContentLength64 = html.LongLength;
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2017-06-12 23:24:40 +00:00
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using (var s = response.OutputStream) {
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2017-06-13 01:37:41 +00:00
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s.Write (html, 0, html.Length);
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2017-06-12 22:17:23 +00:00
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}
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2017-06-12 23:24:40 +00:00
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response.Close ();
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2017-06-12 22:17:23 +00:00
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}
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async void ProcessWebSocketRequest (HttpListenerContext listenerContext, CancellationToken token)
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{
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WebSocketContext webSocketContext = null;
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try {
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2017-06-13 01:50:48 +00:00
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webSocketContext = await listenerContext.AcceptWebSocketAsync(subProtocol: "ooui-1.0").ConfigureAwait (false);
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2017-06-12 22:17:23 +00:00
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Console.WriteLine ("Accepted WebSocket: {0}", webSocketContext);
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}
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catch (Exception e) {
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listenerContext.Response.StatusCode = 500;
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listenerContext.Response.Close();
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Console.WriteLine ("Failed to accept WebSocket: {0}", e);
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return;
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}
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WebSocket webSocket = null;
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try {
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webSocket = webSocketContext.WebSocket;
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var receiveBuffer = new byte[1024];
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while (webSocket.State == WebSocketState.Open && !token.IsCancellationRequested) {
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var receiveResult = await webSocket.ReceiveAsync(new ArraySegment<byte>(receiveBuffer), token);
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if (receiveResult.MessageType == WebSocketMessageType.Close) {
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2017-06-12 23:24:40 +00:00
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await webSocket.CloseAsync (WebSocketCloseStatus.NormalClosure, "", token).ConfigureAwait (false);
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2017-06-12 22:17:23 +00:00
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}
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else if (receiveResult.MessageType == WebSocketMessageType.Binary) {
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2017-06-12 23:24:40 +00:00
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await webSocket.CloseAsync (WebSocketCloseStatus.InvalidMessageType, "Cannot accept binary frame", token).ConfigureAwait (false);
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2017-06-12 22:17:23 +00:00
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}
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else {
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var size = receiveResult.Count;
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while (!receiveResult.EndOfMessage) {
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if (size >= receiveBuffer.Length) {
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2017-06-12 23:24:40 +00:00
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await webSocket.CloseAsync (WebSocketCloseStatus.MessageTooBig, "Message too big", token).ConfigureAwait (false);
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2017-06-12 22:17:23 +00:00
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return;
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}
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2017-06-12 23:24:40 +00:00
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receiveResult = await webSocket.ReceiveAsync (new ArraySegment<byte>(receiveBuffer, size, receiveBuffer.Length - size), token).ConfigureAwait (false);
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2017-06-12 22:17:23 +00:00
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size += receiveResult.Count;
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}
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var receivedString = Encoding.UTF8.GetString (receiveBuffer, 0, size);
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Console.WriteLine ("RECEIVED: {0}", receivedString);
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var outputBuffer = new ArraySegment<byte> (Encoding.UTF8.GetBytes ($"You said: {receivedString}"));
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2017-06-12 23:24:40 +00:00
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await webSocket.SendAsync (outputBuffer, WebSocketMessageType.Text, true, token).ConfigureAwait (false);
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2017-06-12 22:17:23 +00:00
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}
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}
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}
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catch (Exception e) {
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Console.WriteLine ("Exception: {0}", e);
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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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}
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}
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