chore: Remove some unused variables

More datails in exception during header parsing.

arstomp/src/Helpers.cs

@@ -81,19 +81,23 @@ namespace ArStomp
 
 		internal static Frame GetFrame(byte[] msgBuffer, CancellationToken cancellationToken)
 		{
-			var utf8 = Encoding.UTF8;
-
 			var inputstream = new MemoryStream(msgBuffer);
-			var bodyoutput = new MemoryStream();
 
-			if (inputstream.ReadByte() == 10)
+			var firstByte = inputstream.ReadByte();
+			if (firstByte == 10)
 			{
 				return HeartbeatFrame;
 			}
-			else
+			else if (firstByte == 13) {
-			{
+				var secondByte = inputstream.ReadByte();
-				inputstream.Seek(0, SeekOrigin.Begin);
+				if (secondByte == 10) {
+					return HeartbeatFrame;
+				} else {
+					throw new Exception("Invalid frame");
 				}
+			}
+			// start from beginning
+			inputstream.Seek(0, SeekOrigin.Begin);
 
 			StreamReader reader = findBody(inputstream);
 
@@ -115,7 +119,7 @@ namespace ArStomp
 				var colon = line.IndexOf(":");
 				if (colon < 1) // must exist and cannot by first character in the line
 				{
-					throw new Exception("Cannot parse header");
+					throw new Exception($"Cannot parse header: colon not found. Cmd: {cmd}, line: `${line}`");
 				}
 				var key = line.Substring(0, colon);
 				var value = line.Substring(colon + 1);

arstomp/src/StompClient.cs

@@ -16,12 +16,15 @@ namespace ArStomp
 	/// </summary>
 	public class StompClient
 	{
+		private int heartBeatInMillis;
 		public static bool Debug { get; set; } = false;
 		private WebSocket ws;
 		private volatile bool stompConnected = false;
 		public CancellationTokenSource Token { get; } = new CancellationTokenSource();
 		private readonly X509Certificate2Collection certCollection;
 		private readonly Dictionary<string, Subscription> subs = new Dictionary<string, Subscription>();
+		private DateTime lastSend = DateTime.UtcNow;
+		private DateTime lastRcvd = DateTime.UtcNow;
 		/// <summary>
 		/// Handler of incoming messages.
 		/// Used only for RPC. <see cref="Subscription">Subsscriptions</see> have own handlers.
@@ -33,14 +36,12 @@ namespace ArStomp
 		/// Works with binary frames.
 		/// </summary>
 		/// <param name="certCollection">collection of root ca certificates (if TLS is used)</param>
-		public StompClient(X509Certificate2Collection certCollection = null)
+		public StompClient(X509Certificate2Collection certCollection = null, int heartBeatSec = 20)
 		{
+			this.heartBeatInMillis = heartBeatSec * 1000;
 			if (certCollection != null && certCollection.Count > 0)
 			{
 				this.certCollection = certCollection;
-
-			 	// In .netstandard2.0 - setup validator globally
-			 	// System.Net.ServicePointManager.ServerCertificateValidationCallback = RemoteCertificateValidationCallback;
 			}
 		}
 
@@ -66,25 +67,55 @@ namespace ArStomp
 		/// <returns>true if server certificate is valid, false otherwise</returns>
 		private bool RemoteCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
 		{
-			if (Debug) Console.WriteLine("Custom RemoteCertificateValidationCallback");
+			if (Debug)
+			{
+				System.Console.WriteLine("Subject: {0}", certificate.Subject.ToString());
+				System.Console.WriteLine("Cert: {0}", certificate.ToString());
+			}
 			// if there is no detected problems we can say OK
-			if ((sslPolicyErrors & (SslPolicyErrors.None)) > 0) return true;
+			if ((sslPolicyErrors & (SslPolicyErrors.None)) > 0)
+			{
+				if (Debug) System.Console.WriteLine("Cert OK: ((sslPolicyErrors & (SslPolicyErrors.None)) > 0)");
+				return true;
+			}
 			// sins that cannot be forgiven
 			if (
 				(sslPolicyErrors & (SslPolicyErrors.RemoteCertificateNameMismatch)) > 0 ||
 				(sslPolicyErrors & (SslPolicyErrors.RemoteCertificateNotAvailable)) > 0
-			) return false;
+			)
+			{
+				if (Debug) System.Console.WriteLine("Cert Fail: (sslPolicyErrors & (SslPolicyErrors.RemoteCertificateNameMismatch)) > 0 - {0}", (sslPolicyErrors & (SslPolicyErrors.RemoteCertificateNameMismatch)) > 0);
+				if (Debug) System.Console.WriteLine("Cert Fail: (sslPolicyErrors & (SslPolicyErrors.RemoteCertificateNotAvailable)) > 0 - {0}", (sslPolicyErrors & (SslPolicyErrors.RemoteCertificateNotAvailable)) > 0);
+				return false;
+			}
+			if (Debug)
+			{
+				System.Console.WriteLine("Chain:");
+				foreach (var ce in chain.ChainElements)
+				{
+					System.Console.WriteLine("Element: {0}", ce.Certificate);
+				}
+			}
 			// last certificate in chain should be one of our trust anchors
 			X509Certificate2 projectedRootCert = chain.ChainElements[chain.ChainElements.Count - 1].Certificate;
 			// check if server's root ca is one of our trusted
 			bool anytrusted = false;
 			foreach (var cert in certCollection)
 			{
+				if (Debug) System.Console.WriteLine("Anytrust: {0}, {1} =? {2}", projectedRootCert.Thumbprint.ToString(), cert.Thumbprint.ToString(), (projectedRootCert.Thumbprint == cert.Thumbprint));
 				anytrusted = anytrusted || (projectedRootCert.Thumbprint == cert.Thumbprint);
 			}
-			if (!anytrusted) return false;
+			if (!anytrusted)
+			{
+				if (Debug) System.Console.WriteLine("Cert Fail: (!anytrusted)");
+				return false;
+			}
 			// any other problems than unknown CA?
-			if (chain.ChainStatus.Any(statusFlags => statusFlags.Status != X509ChainStatusFlags.UntrustedRoot)) return false;
+			if (chain.ChainStatus.Any(statusFlags => statusFlags.Status != X509ChainStatusFlags.UntrustedRoot))
+			{
+				if (Debug) System.Console.WriteLine("Cert Fail: chain.ChainStatus.Any(statusFlags => statusFlags.Status != X509ChainStatusFlags.UntrustedRoot)");
+				return false;
+			}
 			// everything OK
 			if (Debug) Console.WriteLine("Certificate OK");
 			return true;
@@ -116,9 +147,12 @@ namespace ArStomp
 		{
 			if (ws != null) throw new Exception("Cannot connect in this state. Should close before");
 			ws = new WebSocket(uri.ToString(), "v12.stomp");
-			if (uri.Scheme == "wss" && certCollection != null)
+			if (uri.Scheme == "wss")
+			{
+				if (certCollection != null)
 				{
 					ws.SslConfiguration.ServerCertificateValidationCallback = RemoteCertificateValidationCallback;
+				}
 				ws.SslConfiguration.EnabledSslProtocols = System.Security.Authentication.SslProtocols.Tls12;
 			}
 			var ct = Token.Token;
@@ -139,12 +173,14 @@ namespace ArStomp
 			ws.OnOpen += (sender, o) =>
 			{
 				if (Debug) System.Console.WriteLine("OnOpen");
-				StompFrm connect = new StompFrm(login, password);
+				StompFrm connect = new StompFrm(login, password, heartBeatInMillis);
+				lastSend = DateTime.UtcNow;
 				Task.Run(() => { return connect.Serialize(ws, ct); });
 			};
 
 			ws.OnMessage += (sender, o) =>
 			{
+				lastRcvd = DateTime.UtcNow;
 				try
 				{
 					if (Debug)
@@ -162,7 +198,8 @@ namespace ArStomp
 							ExpectFrame(fr, FrameType.Connected);
 							openTask.TrySetResult(true);
 							if (Debug) System.Console.WriteLine("Logon done");
-						} catch (Exception e)
+						}
+						catch (Exception e)
 						{
 							openTask.TrySetException(e);
 						}
@@ -191,7 +228,7 @@ namespace ArStomp
 		/// <returns>true if it looks like we have proper connection to server</returns>
 		public bool IsConnected()
 		{
-			return ws != null && ws.IsAlive;
+			return ws != null && ws.IsAlive && (DateTime.UtcNow - lastRcvd) < TimeSpan.FromMilliseconds(3 * heartBeatInMillis);
 		}
 		/// <summary>
 		/// Send message
@@ -205,6 +242,7 @@ namespace ArStomp
 
 			SendFrm send = new SendFrm(destination, correlationId, body);
 			await send.Serialize(ws, ct);
+			lastSend = DateTime.UtcNow;
 		}
 
 		private int SubId = 0;
@@ -248,15 +286,8 @@ namespace ArStomp
 			var ct = Token.Token;
 			try
 			{
-				Frame fr = null;
+				Frame fr = Helpers.GetFrame(msg.RawData, ct);
-				try
+
-				{
-					fr = Helpers.GetFrame(msg.RawData, ct);
-				}
-				catch (Exception e)
-				{
-					throw e;
-				}
 				if (fr.Type == FrameType.Error) ExpectFrame(fr, FrameType.Message);
 				if (fr.Type == FrameType.Message)
 				{
@@ -275,6 +306,12 @@ namespace ArStomp
 						}
 					}
 				}
+				if (fr.Type == FrameType.Heartbeat || DateTime.UtcNow - lastSend > TimeSpan.FromSeconds(20))
+				{
+					lastSend = DateTime.UtcNow;
+					ws.Send(new byte[] { 10 }); // send heartbeat
+				}
+
 
 			}
 			catch (Exception e)

arstomp/src/StompFrame.cs

@@ -103,18 +103,18 @@ namespace ArStomp
 			stream.Position = 0;
 			ws.Send(stream, (int) stream.Length);
 			return Task.CompletedTask;
-			//return ws.SendAsync(new ArraySegment<byte>(array, 0, (int)stream.Position), WebSocketMessageType.Binary, true, cancellationToken);
 		}
 	}
 
 	internal class StompFrm : Frame
 	{
-		public StompFrm(string login, string passwd)
+		public StompFrm(string login, string passwd, int hbmilis)
 		{
 			Type = FrameType.Stomp;
 			Headers["login"] = login;
 			Headers["passcode"] = passwd;
 			Headers["accept-version"] = "1.2";
+			if (hbmilis > 0) Headers["heart-beat"] = $"{hbmilis},{hbmilis}";
 		}
 	}