Merge from vscode 31e03b8ffbb218a87e3941f2b63a249f061fe0e4 (#4986)

src/vs/workbench/services/extensions/common/extensionHostProtocol.ts

@@ -0,0 +1,46 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { VSBuffer } from 'vs/base/common/buffer';
+
+export interface IExtHostReadyMessage {
+	type: 'VSCODE_EXTHOST_IPC_READY';
+}
+
+export interface IExtHostSocketMessage {
+	type: 'VSCODE_EXTHOST_IPC_SOCKET';
+	initialDataChunk: string;
+}
+
+export const enum MessageType {
+	Initialized,
+	Ready,
+	Terminate
+}
+
+export function createMessageOfType(type: MessageType): VSBuffer {
+	const result = VSBuffer.alloc(1);
+
+	switch (type) {
+		case MessageType.Initialized: result.writeUint8(1, 0); break;
+		case MessageType.Ready: result.writeUint8(2, 0); break;
+		case MessageType.Terminate: result.writeUint8(3, 0); break;
+	}
+
+	return result;
+}
+
+export function isMessageOfType(message: VSBuffer, type: MessageType): boolean {
+	if (message.byteLength !== 1) {
+		return false;
+	}
+
+	switch (message.readUint8(0)) {
+		case 1: return type === MessageType.Initialized;
+		case 2: return type === MessageType.Ready;
+		case 3: return type === MessageType.Terminate;
+		default: return false;
+	}
+}