Introduce connection API (#598)

Including getCurrentConnection, getActiveConnections, and getCredentials

src/sql/workbench/api/node/extHostConnectionManagement.ts

@@ -0,0 +1,33 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import { IThreadService } from 'vs/workbench/services/thread/common/threadService';
+import { ExtHostConnectionManagementShape, SqlMainContext, MainThreadConnectionManagementShape } from 'sql/workbench/api/node/sqlExtHost.protocol';
+import * as data from 'data';
+
+export class ExtHostConnectionManagement extends ExtHostConnectionManagementShape  {
+
+	private _proxy: MainThreadConnectionManagementShape;
+
+	constructor(
+		threadService: IThreadService
+	) {
+		super();
+		this._proxy = threadService.get(SqlMainContext.MainThreadConnectionManagement);
+	}
+
+	public $getActiveConnections(): Thenable<data.connection.Connection[]> {
+		return this._proxy.$getActiveConnections();
+	}
+
+	public $getCurrentConnection(): Thenable<data.connection.Connection> {
+		return this._proxy.$getCurrentConnection();
+	}
+
+	public $getCredentials(connectionId: string): Thenable<{ [name: string]: string}> {
+		return this._proxy.$getCredentials(connectionId);
+	}
+}