Merge pull request #26 from Microsoft/feature/serviceLayerVersion

Added a new request handler to return back the service version

src/Microsoft.SqlTools.ServiceLayer/Hosting/Contracts/VersionRequest.cs

@@ -0,0 +1,20 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.Hosting.Contracts
+{
+    /// <summary>
+    /// Defines a message that is sent from the client to request
+    /// the version of the server.
+    /// </summary>
+    public class VersionRequest
+    {
+        public static readonly
+           RequestType<object, string> Type =
+           RequestType<object, string>.Create("version");
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/Hosting/ServiceHost.cs

@@ -11,6 +11,7 @@ using Microsoft.SqlTools.EditorServices.Utility;
 using Microsoft.SqlTools.ServiceLayer.Hosting.Contracts;
 using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol;
 using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Channel;
+using System.Reflection;
 
 namespace Microsoft.SqlTools.ServiceLayer.Hosting
 {
@@ -55,6 +56,7 @@ namespace Microsoft.SqlTools.ServiceLayer.Hosting
             // Register the requests that this service host will handle
             this.SetRequestHandler(InitializeRequest.Type, this.HandleInitializeRequest);
             this.SetRequestHandler(ShutdownRequest.Type, this.HandleShutdownRequest);
+            this.SetRequestHandler(VersionRequest.Type, HandleVersionRequest);
         }
 
         #endregion
@@ -69,6 +71,8 @@ namespace Microsoft.SqlTools.ServiceLayer.Hosting
 
         private readonly List<InitializeCallback> initializeCallbacks;
 
+        private static readonly Version serviceVersion = Assembly.GetEntryAssembly().GetName().Version;
+
         #endregion
 
         #region Public Methods
@@ -149,6 +153,17 @@ namespace Microsoft.SqlTools.ServiceLayer.Hosting
                 });
         }
 
+        /// <summary>
+        /// Handles the version request. Sends back the server version as result.
+        /// </summary>
+        private static async Task HandleVersionRequest(
+          object versionRequestParams,
+          RequestContext<string> requestContext)
+        {
+            Logger.Write(LogLevel.Verbose, "HandleVersionRequest");
+            await requestContext.SendResult(serviceVersion.ToString());
+        }
+
         #endregion
     }
 }