Feature/restore db (#403)

* Added service handlers for restore database operations

src/Microsoft.SqlTools.ServiceLayer/DisasterRecovery/Contracts/RestoreRequest.cs

@@ -0,0 +1,125 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System.Collections.Generic;
+using Microsoft.SqlTools.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery.Contracts
+{
+    /// <summary>
+    /// Restore request parameters
+    /// </summary>
+    public class RestoreParams
+    {
+        /// <summary>
+        /// The Uri to find the connection to do the restore operations
+        /// </summary>
+        public string OwnerUri { get; set; }
+
+        /// <summary>
+        /// The backup file path
+        /// </summary>
+        public string BackupFilePath { get; set; }
+
+        /// <summary>
+        /// Database name to restore from (either the back file path or database name can be used for restore operation, 
+        /// If the backup file is set, the database name will be ignored)
+        /// </summary>
+        public string DatabaseName { get; set; }
+
+        /// <summary>
+        /// If set to true, the db files will be relocated to default data location in the server
+        /// </summary>
+        public bool RelocateDbFiles { get; set; }
+    }
+
+    /// <summary>
+    /// Restore response
+    /// </summary>
+    public class RestoreResponse
+    {
+        /// <summary>
+        /// Indicates if the restore task created successfully 
+        /// </summary>
+        public bool Result { get; set; }
+
+        /// <summary>
+        /// The task id assosiated witht the restore operation
+        /// </summary>
+        public string TaskId { get; set; }
+
+
+        /// <summary>
+        /// Errors occurred while creating the restore operation task
+        /// </summary>
+        public string ErrorMessage { get; set; }
+    }
+
+    /// <summary>
+    /// Restore Plan Response
+    /// </summary>
+    public class RestorePlanResponse
+    {
+        /// <summary>
+        /// The backup file path
+        /// </summary>
+        public string BackupFilePath { get; set; }
+
+        /// <summary>
+        /// Indicates whether the restore operation is supported 
+        /// </summary>
+        public bool CanRestore { get; set; }
+
+        /// <summary>
+        /// Errors occurred while creating restore plan
+        /// </summary>
+        public string ErrorMessage { get; set; }
+
+        /// <summary>
+        /// The db files included in the backup file
+        /// </summary>
+        public IEnumerable<string> DbFiles { get; set; }
+
+        /// <summary>
+        /// Server name
+        /// </summary>
+        public string ServerName { get; set; }
+
+        /// <summary>
+        /// Database name to restore to
+        /// </summary>
+        public string DatabaseName { get; set; }
+
+        /// <summary>
+        /// Indicates whether relocating the db files is required 
+        /// because the original file paths are not valid in the target server
+        /// </summary>
+        public bool RelocateFilesNeeded { get; set; }
+
+        /// <summary>
+        /// Default Data folder path in the target server
+        /// </summary>
+        public string DefaultDataFolder { get; set; }
+
+        /// <summary>
+        /// Default log folder path in the target server
+        /// </summary>
+        public string DefaultLogFolder { get; set; }
+    }
+
+    public class RestoreRequest
+    {
+        public static readonly
+            RequestType<RestoreParams, RestoreResponse> Type =
+                RequestType<RestoreParams, RestoreResponse>.Create("disasterrecovery/restore");
+    }
+
+    public class RestorePlanRequest
+    {
+        public static readonly
+            RequestType<RestoreParams, RestorePlanResponse> Type =
+                RequestType<RestoreParams, RestorePlanResponse>.Create("disasterrecovery/restoreplan");
+    }
+}