Support "SQL" settings in addition to MSSQL (#398)

* Support "SQL" settings in addition to MSSQL
- Handles having 2 separate configuration definitions and merging / treating them as 1 throughout the app
- If a settings group such as Intellisense is defined on mssql, it will override any generic SQL properties
- Retains backwards compatibility with existing settings.

src/Microsoft.SqlTools.ServiceLayer/Connection/ConnectionService.cs

@@ -709,9 +709,6 @@ namespace Microsoft.SqlTools.ServiceLayer.Connection
             serviceHost.SetRequestHandler(CancelConnectRequest.Type, HandleCancelConnectRequest);
             serviceHost.SetRequestHandler(DisconnectRequest.Type, HandleDisconnectRequest);
             serviceHost.SetRequestHandler(ListDatabasesRequest.Type, HandleListDatabasesRequest);
-
-            // Register the configuration update handler
-            WorkspaceService<SqlToolsSettings>.Instance.RegisterConfigChangeCallback(HandleDidChangeConfigurationNotification);
         }
 
         /// <summary> 
@@ -845,14 +842,6 @@ namespace Microsoft.SqlTools.ServiceLayer.Connection
             }
         }
                 
-        public Task HandleDidChangeConfigurationNotification(
-            SqlToolsSettings newSettings, 
-            SqlToolsSettings oldSettings, 
-            EventContext eventContext)
-        {
-            return Task.FromResult(true);
-        }
-        
         /// <summary>
         /// Build a connection string from a connection details instance
         /// </summary>

src/Microsoft.SqlTools.ServiceLayer/SqlContext/CompoundSqlToolsSettingsValues.cs

@@ -0,0 +1,102 @@
+//
+// 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.Collections.Generic;
+using System.Linq;
+using Microsoft.SqlTools.Utility;
+using Newtonsoft.Json;
+
+namespace Microsoft.SqlTools.ServiceLayer.SqlContext
+{
+    
+    /// <summary>
+    /// Handles backwards compatibility of settings by checking for settings in a priority list. If a settings
+    /// group such as Intellisense is defined on a serialized setting it's used in the order of mssql, then sql, then
+    /// falls back to a default value.
+    /// </summary>
+    public class CompoundToolsSettingsValues: ISqlToolsSettingsValues
+    {
+        private List<ISqlToolsSettingsValues> priorityList = new List<ISqlToolsSettingsValues>();
+        private SqlToolsSettingsValues defaultValues;
+        public CompoundToolsSettingsValues(ISqlToolsSettingsValues mssql, ISqlToolsSettingsValues all)
+        {
+            Validate.IsNotNull(nameof(mssql), mssql);
+            Validate.IsNotNull(nameof(all), all);
+            priorityList.Add(mssql);
+            priorityList.Add(all);
+            // Always add in a fallback which has default values to be used.
+            defaultValues = new SqlToolsSettingsValues(createDefaults: true);
+            priorityList.Add(defaultValues);
+        }
+
+        private T GetSettingOrDefault<T>(Func<ISqlToolsSettingsValues, T> lookup)
+            where T : new()
+        {
+            T value = priorityList.Select( (settings) => lookup(settings)).Where(val => val != null).FirstOrDefault();
+            return value != null ? value : new T();
+        }
+
+        /// <summary>
+        /// Gets or sets the detailed IntelliSense settings
+        /// </summary>
+        public IntelliSenseSettings IntelliSense
+        { 
+            get
+            {
+                return GetSettingOrDefault((settings) => settings.IntelliSense);
+            } 
+            set
+            {
+                priorityList[0].IntelliSense = value;
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the query execution settings
+        /// </summary>
+        public QueryExecutionSettings QueryExecutionSettings
+        { 
+            get
+            {
+                return GetSettingOrDefault((settings) => settings.QueryExecutionSettings);
+            } 
+            set
+            {
+                priorityList[0].QueryExecutionSettings = value;
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the formatter settings
+        /// </summary>
+        public FormatterSettings Format
+        { 
+            get
+            {
+                return GetSettingOrDefault((settings) => settings.Format);
+            } 
+            set
+            {
+                priorityList[0].Format = value;
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the object explorer settings
+        /// </summary>
+        public ObjectExplorerSettings ObjectExplorer
+        { 
+            get
+            {
+                return GetSettingOrDefault((settings) => settings.ObjectExplorer);
+            } 
+            set
+            {
+                priorityList[0].ObjectExplorer = value;
+            }
+        }
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/SqlContext/ISqlToolsSettingsValues.cs

@@ -0,0 +1,33 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.SqlTools.ServiceLayer.SqlContext
+{
+    /// <summary>
+    /// Defines the common settings used by the tools service
+    /// </summary>
+    public interface ISqlToolsSettingsValues
+    {
+        /// <summary>
+        /// Intellisense specific settings
+        /// </summary>
+        IntelliSenseSettings IntelliSense { get; set; }
+
+        /// <summary>
+        /// Query execution specific settings
+        /// </summary>
+        QueryExecutionSettings QueryExecutionSettings { get; set; }
+
+        /// <summary>
+        /// Formatter settings
+        /// </summary>
+        FormatterSettings Format { get; set; }
+
+        /// <summary>
+        /// Object Explorer specific settings
+        /// </summary>
+        ObjectExplorerSettings ObjectExplorer { get; set; }
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/SqlContext/IntelliSenseSettings.cs

@@ -57,6 +57,7 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
         {
             if (settings != null)
             {
+                this.EnableIntellisense = settings.EnableIntellisense;
                 this.EnableSuggestions = settings.EnableSuggestions;
                 this.LowerCaseSuggestions = settings.LowerCaseSuggestions;
                 this.EnableErrorChecking = settings.EnableErrorChecking;

src/Microsoft.SqlTools.ServiceLayer/SqlContext/SqlToolsSettings.cs

@@ -3,6 +3,10 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.SqlTools.Utility;
 using Newtonsoft.Json;
 
 namespace Microsoft.SqlTools.ServiceLayer.SqlContext
@@ -12,19 +16,17 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
     /// </summary>
     public class SqlToolsSettings
     {
-        private SqlToolsSettingsValues sqlTools = null; 
+        private ISqlToolsSettingsValues sqlTools = null; 
+        private SqlToolsSettingsValues mssqlTools = null; 
+        private SqlToolsSettingsValues allSqlTools = null; 
 
-        /// <summary>
+        public ISqlToolsSettingsValues SqlTools 
-        /// Gets or sets the underlying settings value object
-        /// </summary>
-        [JsonProperty("mssql")]
-        public SqlToolsSettingsValues SqlTools 
         { 
             get
             {
                 if (this.sqlTools == null)
                 {
-                    this.sqlTools = new SqlToolsSettingsValues();
+                    this.sqlTools = new CompoundToolsSettingsValues(MssqlTools, AllSqlTools);
                 }
                 return this.sqlTools;
             } 
@@ -34,6 +36,46 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
             }
         }
 
+        /// <summary>
+        /// Gets or sets the underlying settings value object
+        /// </summary>
+        [JsonProperty("mssql")]
+        public SqlToolsSettingsValues MssqlTools 
+        { 
+            get
+            {
+                if (this.mssqlTools == null)
+                {
+                    this.mssqlTools = new SqlToolsSettingsValues(false);
+                }
+                return this.mssqlTools;
+            } 
+            set
+            {
+                this.mssqlTools = value;
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the underlying settings value object
+        /// </summary>
+        [JsonProperty("sql")]
+        public SqlToolsSettingsValues AllSqlTools 
+        { 
+            get
+            {
+                if (this.allSqlTools == null)
+                {
+                    this.allSqlTools = new SqlToolsSettingsValues(false);
+                }
+                return this.allSqlTools;
+            } 
+            set
+            {
+                this.sqlTools = value;
+            }
+        }
+
         /// <summary>
         /// Query excution settings forwarding property
         /// </summary>
@@ -50,7 +92,6 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
         {
             if (settings != null)
             {
-                this.SqlTools.IntelliSense.EnableIntellisense = settings.SqlTools.IntelliSense.EnableIntellisense;
                 this.SqlTools.IntelliSense.Update(settings.SqlTools.IntelliSense);
             }
         }
@@ -102,43 +143,4 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
             }
         }
     }
-
-    /// <summary>
-    /// Class that is used to serialize and deserialize SQL Tools settings
-    /// </summary>
-    public class SqlToolsSettingsValues
-    {
-        /// <summary>
-        /// Initializes the Sql Tools settings values
-        /// </summary>
-        public SqlToolsSettingsValues()
-        {
-            IntelliSense = new IntelliSenseSettings();
-            QueryExecutionSettings = new QueryExecutionSettings();
-            Format = new FormatterSettings();
-        }
-
-        /// <summary>
-        /// Gets or sets the detailed IntelliSense settings
-        /// </summary>
-        public IntelliSenseSettings IntelliSense { get; set; }
-
-        /// <summary>
-        /// Gets or sets the query execution settings
-        /// </summary>
-        [JsonProperty("query")]
-        public QueryExecutionSettings QueryExecutionSettings { get; set; }
-
-        /// <summary>
-        /// Gets or sets the formatter settings
-        /// </summary>
-        [JsonProperty("format")]
-        public FormatterSettings Format { get; set; }
-
-        /// <summary>
-        /// Gets or sets the formatter settings
-        /// </summary>
-        [JsonProperty("objectExplorer")]
-        public ObjectExplorerSettings ObjectExplorer { get; set; }
-    }
 }

src/Microsoft.SqlTools.ServiceLayer/SqlContext/SqlToolsSettingsValues.cs

@@ -0,0 +1,55 @@
+//
+// 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.Collections.Generic;
+using System.Linq;
+using Microsoft.SqlTools.Utility;
+using Newtonsoft.Json;
+
+namespace Microsoft.SqlTools.ServiceLayer.SqlContext
+{
+    /// <summary>
+    /// Class that is used to serialize and deserialize SQL Tools settings
+    /// </summary>
+    public class SqlToolsSettingsValues : ISqlToolsSettingsValues
+    {
+        /// <summary>
+        /// Initializes the Sql Tools settings values
+        /// </summary>
+        public SqlToolsSettingsValues(bool createDefaults = true)
+        {
+            if (createDefaults)
+            {
+                IntelliSense = new IntelliSenseSettings();
+                QueryExecutionSettings = new QueryExecutionSettings();
+                Format = new FormatterSettings();
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the detailed IntelliSense settings
+        /// </summary>
+        public IntelliSenseSettings IntelliSense { get; set; }
+
+        /// <summary>
+        /// Gets or sets the query execution settings
+        /// </summary>
+        [JsonProperty("query")]
+        public QueryExecutionSettings QueryExecutionSettings { get; set; }
+
+        /// <summary>
+        /// Gets or sets the formatter settings
+        /// </summary>
+        [JsonProperty("format")]
+        public FormatterSettings Format { get; set; }
+
+        /// <summary>
+        /// Gets or sets the formatter settings
+        /// </summary>
+        [JsonProperty("objectExplorer")]
+        public ObjectExplorerSettings ObjectExplorer { get; set; }
+    }
+}

test/Microsoft.SqlTools.ServiceLayer.UnitTests/Formatter/FormatterSettingsTests.cs

@@ -3,6 +3,7 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+using System.Globalization;
 using Microsoft.SqlTools.ServiceLayer.Formatter;
 using Microsoft.SqlTools.ServiceLayer.Formatter.Contracts;
 using Microsoft.SqlTools.ServiceLayer.SqlContext;
@@ -28,10 +29,16 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.Formatter
         [Fact]
         public void ValidateFormatSettingsParsedFromJson()
         {
-            const string settingsJson = @"
+            ValidateFormatSettings("mssql");
+            ValidateFormatSettings("sql");
+        }
+
+        private static void ValidateFormatSettings(string settingsPropertyName)
+        {
+            string settingsJson = @"
 {
     ""params"": {
-        ""mssql"": {
+        """ + settingsPropertyName + @""": {
             ""format"": {
                 useBracketForIdentifiers: true,
                 placeCommasBeforeNextStatement: true,

test/Microsoft.SqlTools.ServiceLayer.UnitTests/QueryExecution/SettingsTests.cs

@@ -31,11 +31,17 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution
 
         [Fact]
         public void ValidateSettingsParsedFromJson()
+        {
+            ValidateSettings("mssql");
+            ValidateSettings("sql");
+        }
+
+        private static void ValidateSettings(string settingsPropertyName)
         {
             // NOTE: Only testing displayBitAsNumber for now because it is the only one piped through
-            const string settingsJson = @"{"
+            string settingsJson = @"{"
                                         + @"""params"": {"
-                                        + @"""mssql"": {"
+                                        + @""""+settingsPropertyName+@""": {"
                                         + @"""query"": {"
                                         + @"displayBitAsNumber: false"
                                         + @"}"