Add create model request (#1603)

* add create model request

src/Microsoft.SqlTools.ServiceLayer/DacFx/Contracts/GenerateTSqlModelRequest.cs

@@ -0,0 +1,39 @@
+//
+// 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.Hosting.Protocol.Contracts;
+using Microsoft.SqlTools.ServiceLayer.Utility;
+
+namespace Microsoft.SqlTools.ServiceLayer.DacFx.Contracts
+{
+    /// <summary>
+    /// Parameters to generate a SQL model
+    /// </summary>
+    public class GenerateTSqlModelParams
+    {
+        /// <summary>
+        /// URI of the project file this model is for
+        /// </summary>
+        public string ProjectUri { get; set; }
+
+        /// <summary>
+        /// The version of Sql Server to target
+        /// </summary>
+        public string ModelTargetVersion { get; set; }
+
+        /// <summary>
+        /// Gets or sets the Sql script file paths.
+        /// </summary>
+        public string[] FilePaths { get; set; }
+    }
+
+    /// <summary>
+    /// Defines the generate sql model request
+    /// </summary>
+    class GenerateTSqlModelRequest
+    {
+        public static readonly RequestType<GenerateTSqlModelParams, ResultStatus> Type =
+            RequestType<GenerateTSqlModelParams, ResultStatus>.Create("dacFx/generateTSqlModel");
+    }
+}

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

@@ -11,6 +11,8 @@ using Microsoft.SqlTools.ServiceLayer.Connection;
 using Microsoft.SqlTools.ServiceLayer.DacFx.Contracts;
 using Microsoft.SqlTools.ServiceLayer.Hosting;
 using Microsoft.SqlTools.ServiceLayer.TaskServices;
+using Microsoft.SqlServer.Dac.Model;
+using Microsoft.SqlTools.ServiceLayer.Utility;
 using DacTableDesigner = Microsoft.Data.Tools.Sql.DesignServices.TableDesigner.TableDesigner;
 
 namespace Microsoft.SqlTools.ServiceLayer.DacFx
@@ -25,6 +27,11 @@ namespace Microsoft.SqlTools.ServiceLayer.DacFx
         private static readonly Lazy<DacFxService> instance = new Lazy<DacFxService>(() => new DacFxService());
         private readonly Lazy<ConcurrentDictionary<string, DacFxOperation>> operations =
             new Lazy<ConcurrentDictionary<string, DacFxOperation>>(() => new ConcurrentDictionary<string, DacFxOperation>());
+        /// <summary>
+        /// <see cref="ConcurrentDictionary{String, TSqlModel}"/> that maps project uri to model
+        /// </summary>
+        public Lazy<ConcurrentDictionary<string, TSqlModel>> projectModels =
+            new Lazy<ConcurrentDictionary<string, TSqlModel>>(() => new ConcurrentDictionary<string, TSqlModel>());
 
         /// <summary>
         /// Gets the singleton instance object
@@ -50,6 +57,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DacFx
             serviceHost.SetRequestHandler(ValidateStreamingJobRequest.Type, this.HandleValidateStreamingJobRequest);
             serviceHost.SetRequestHandler(GetDefaultPublishOptionsRequest.Type, this.HandleGetDefaultPublishOptionsRequest);
             serviceHost.SetRequestHandler(ParseTSqlScriptRequest.Type, this.HandleParseTSqlScriptRequest);
+            serviceHost.SetRequestHandler(GenerateTSqlModelRequest.Type, this.HandleGenerateTSqlModelRequest);
         }
 
         /// <summary>
@@ -323,6 +331,26 @@ namespace Microsoft.SqlTools.ServiceLayer.DacFx
             }
         }
 
+        public async Task HandleGenerateTSqlModelRequest(GenerateTSqlModelParams requestParams, RequestContext<ResultStatus> requestContext)
+        {
+            try
+            {
+                GenerateTSqlModelOperation operation = new GenerateTSqlModelOperation(requestParams);
+                TSqlModel model = operation.GenerateTSqlModel();
+
+                projectModels.Value[operation.Parameters.ProjectUri] = model;
+                await requestContext.SendResult(new ResultStatus
+                {
+                    Success = true,
+                    ErrorMessage = null
+                });
+            }
+            catch (Exception e)
+            {
+                await requestContext.SendError(e);
+            }
+        }
+
         private void ExecuteOperation(DacFxOperation operation, DacFxParams parameters, string taskName, RequestContext<DacFxResult> requestContext)
         {
             Task.Run(async () =>

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

@@ -0,0 +1,53 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+using System.Diagnostics;
+using Microsoft.SqlTools.ServiceLayer.DacFx.Contracts;
+using Microsoft.SqlTools.Utility;
+using Microsoft.SqlServer.Dac.Model;
+
+namespace Microsoft.SqlTools.ServiceLayer.DacFx
+{
+    /// <summary>
+    /// Class to represent creating a dacfx model
+    /// </summary>
+    class GenerateTSqlModelOperation
+    {
+        public GenerateTSqlModelParams Parameters { get; }
+
+        public GenerateTSqlModelOperation(GenerateTSqlModelParams parameters)
+        {
+            Validate.IsNotNull("parameters", parameters);
+            this.Parameters = parameters;
+        }
+
+        /// <summary>
+        /// Generate model from sql files, if no sql files are passed in then it generates an empty model.
+        /// </summary>
+        public TSqlModel GenerateTSqlModel()
+        {
+            try
+            {
+                TSqlModelOptions options = new TSqlModelOptions();
+                SqlServerVersion version = (SqlServerVersion)Enum.Parse(typeof(SqlServerVersion), Parameters.ModelTargetVersion);
+
+                var model = new TSqlModel(version, options);
+                // read all sql files
+                foreach (string filePath in Parameters.FilePaths)
+                {
+                    string fileContent = System.IO.File.ReadAllText(filePath);
+                    model.AddOrUpdateObjects(fileContent, filePath, null);
+                }
+                return model;
+            }
+            catch (Exception ex)
+            {
+                Logger.Write(TraceEventType.Information, $"Failed to generate model. Error: {ex.Message}");
+                throw;
+            }
+        }
+    }
+}