Better date header updating

Author: benaadams

experimental/ManagedRIOHttpServer/Program.cs

@@ -21,15 +21,25 @@ public sealed class Program
             "Content-Length:13\r\n" +
             "Connection:keep-alive\r\n" +
             "Server:-RIO-\r\n" +
-            "Date:";
+            "Date:DDD, dd mmm yyyy hh:mm:ss GMT" +
+            "\r\n\r\n";
 
-        private static byte[] _headersBytes = Encoding.UTF8.GetBytes(headersKeepAliveStr);
+        private static byte[] _headersBytes = Encoding.ASCII.GetBytes(headersKeepAliveStr);
 
-        static readonly string bodyStr = "\r\n\r\n" +
-            "Hello, World!";
+        private static readonly string bodyStr = "Hello, World!";
 
         private static byte[] _bodyBytes = Encoding.UTF8.GetBytes(bodyStr);
+        private static Timer UpdateDateTimer;
 
+        static Program()
+        {
+            var start = _headersBytes.Length - 33;
+            UpdateDateTimer = new Timer((obj) =>
+            {
+               var date = DateTime.UtcNow.ToString("r");
+               Encoding.ASCII.GetBytes(date, 0, date.Length, _headersBytes, start);
+            }, null, 0, 1000);
+        }
 
         static void Main(string[] args)
         {
@@ -105,12 +115,9 @@ static async Task ServeSocket(RIOTcpConnection socket)
 
                 var receiveTask = socket.ReceiveAsync(receiveBuffer0, CancellationToken.None);
 
-                var dateBytes = Encoding.UTF8.GetBytes("DDD, dd mmm yyyy hh:mm:ss GMT");
-
 
                 var loop = 0;
                 var overflow = 0;
-                var lastSeconds = 0L;
                 // need to check for keep alive
 
                 while (true)
@@ -278,22 +285,13 @@ static async Task ServeSocket(RIOTcpConnection socket)
                         break;
                     }
 
-                    var now = DateTime.UtcNow;
-                    var ticks = now.Ticks / TicksPerSecond;
-                    if (lastSeconds != ticks) {
-                        lastSeconds = ticks;
-                        var date = now.ToString("r");
-                        Encoding.ASCII.GetBytes(date, 0, dateBytes.Length, dateBytes, 0);
-                    }
 
                     for (var i = 1; i < count; i++)
                     {
                         socket.QueueSend(headerBuffer, false);
-                        socket.QueueSend(new ArraySegment<byte>(dateBytes), false);
                         socket.QueueSend(bodyBuffer, false);
                     }
                     socket.QueueSend(headerBuffer, false);
-                    socket.QueueSend(new ArraySegment<byte>(dateBytes), false);
                     // force send if not more ready to recieve/pack
                     var nextReady = receiveTask.IsCompleted;
                     socket.QueueSend(bodyBuffer, (!nextReady));