Add Id to ConnectionInfo (#828)

Author: khellang

src/Microsoft.AspNetCore.Http.Abstractions/ConnectionInfo.cs

@@ -10,6 +10,11 @@ namespace Microsoft.AspNetCore.Http
 {
     public abstract class ConnectionInfo
     {
+        /// <summary>
+        /// Gets or sets a unique identifier to represent this connection.
+        /// </summary>
+        public abstract string Id { get; set; }
+
         public abstract IPAddress RemoteIpAddress { get; set; }
 
         public abstract int RemotePort { get; set; }
@@ -22,4 +27,4 @@ public abstract class ConnectionInfo
 
         public abstract Task<X509Certificate2> GetClientCertificateAsync(CancellationToken cancellationToken = new CancellationToken());
     }
-}
+}

src/Microsoft.AspNetCore.Http/Internal/DefaultConnectionInfo.cs

@@ -39,6 +39,13 @@ public virtual void Uninitialize()
         private ITlsConnectionFeature TlsConnectionFeature=>
             _features.Fetch(ref _features.Cache.TlsConnection, _newTlsConnectionFeature);
 
+        /// <inheritdoc />
+        public override string Id
+        {
+            get { return HttpConnectionFeature.ConnectionId; }
+            set { HttpConnectionFeature.ConnectionId = value; }
+        }
+
         public override IPAddress RemoteIpAddress
         {
             get { return HttpConnectionFeature.RemoteIpAddress; }
@@ -80,4 +87,4 @@ struct FeatureInterfaces
             public ITlsConnectionFeature TlsConnection;
         }
     }
-}
+}