DacFx import/export (#728)

Adding DacFx import/export/deploy/extract functionality

src/Microsoft.SqlTools.ServiceLayer/DacFx/DacFxOperation.cs

@@ -0,0 +1,93 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+using Microsoft.SqlServer.Dac;
+using Microsoft.SqlTools.ServiceLayer.TaskServices;
+using Microsoft.SqlTools.Utility;
+using System;
+using System.Data.SqlClient;
+using System.Diagnostics;
+using System.Threading;
+
+namespace Microsoft.SqlTools.ServiceLayer.DacFx
+{
+    /// <summary>
+    /// Base class for DacFx operations
+    /// </summary>
+    abstract class DacFxOperation : ITaskOperation
+    {
+        private CancellationTokenSource cancellation = new CancellationTokenSource();
+        private bool disposed = false;
+
+        /// <summary>
+        /// Gets the unique id associated with this instance.
+        /// </summary>
+        public string OperationId { get; private set; }
+
+        public SqlTask SqlTask { get; set; }
+
+        protected SqlConnection SqlConnection { get; private set; }
+
+        protected DacServices DacServices { get; private set; }
+
+        protected DacFxOperation(SqlConnection sqlConnection)
+        {
+            Validate.IsNotNull("sqlConnection", sqlConnection);
+            this.SqlConnection = sqlConnection;
+            this.OperationId = Guid.NewGuid().ToString();
+        }
+
+        protected CancellationToken CancellationToken { get { return this.cancellation.Token; } }
+
+        /// <summary>
+        /// The error occurred during operation
+        /// </summary>
+        public string ErrorMessage { get; }
+
+        /// <summary>
+        /// Cancel operation
+        /// </summary>
+        public void Cancel()
+        {
+            if (!this.cancellation.IsCancellationRequested)
+            {
+                Logger.Write(TraceEventType.Verbose, string.Format("Cancel invoked for OperationId {0}", this.OperationId));
+                this.cancellation.Cancel();
+            }
+        }
+
+        /// <summary>
+        /// Disposes the operation.
+        /// </summary>
+        public void Dispose()
+        {
+            if (!disposed)
+            {
+                this.Cancel();
+                disposed = true;
+            }
+        }
+
+        public void Execute(TaskExecutionMode mode)
+        {
+            if (this.CancellationToken.IsCancellationRequested)
+            {
+                throw new OperationCanceledException(this.CancellationToken);
+            }
+
+            try
+            {
+                this.DacServices = new DacServices(this.SqlConnection.ConnectionString);
+                Execute();
+            }
+            catch (Exception e)
+            {
+                Logger.Write(TraceEventType.Error, string.Format("DacFx import operation {0} failed with exception {1}", this.OperationId, e));
+                throw;
+            }
+        }
+
+        public abstract void Execute();
+    }
+}