Merge from vscode 05fc61ffb1aee9fd19173c32113daed079f9b7bd (#5074)

* Merge from vscode 05fc61ffb1aee9fd19173c32113daed079f9b7bd

* fix tests

src/vs/platform/remote/common/remoteAuthorityResolver.ts

@@ -13,6 +13,49 @@ export interface ResolvedAuthority {
 	readonly port: number;
 }
 
+export enum RemoteAuthorityResolverErrorCode {
+	Unknown = 'Unknown',
+	NotAvailable = 'NotAvailable',
+	TemporarilyNotAvailable = 'TemporarilyNotAvailable',
+}
+
+export class RemoteAuthorityResolverError extends Error {
+
+	public static isHandledNotAvailable(err: any): boolean {
+		if (err instanceof RemoteAuthorityResolverError) {
+			if (err._code === RemoteAuthorityResolverErrorCode.NotAvailable && err._detail === true) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	public static isTemporarilyNotAvailable(err: any): boolean {
+		if (err instanceof RemoteAuthorityResolverError) {
+			return err._code === RemoteAuthorityResolverErrorCode.TemporarilyNotAvailable;
+		}
+		return false;
+	}
+
+	public readonly _message: string | undefined;
+	public readonly _code: RemoteAuthorityResolverErrorCode;
+	public readonly _detail: any;
+
+	constructor(message?: string, code: RemoteAuthorityResolverErrorCode = RemoteAuthorityResolverErrorCode.Unknown, detail?: any) {
+		super(message);
+
+		this._message = message;
+		this._code = code;
+		this._detail = detail;
+
+		// workaround when extending builtin objects and when compiling to ES5, see:
+		// https://github.com/Microsoft/TypeScript-wiki/blob/master/Breaking-Changes.md#extending-built-ins-like-error-array-and-map-may-no-longer-work
+		if (typeof (<any>Object).setPrototypeOf === 'function') {
+			(<any>Object).setPrototypeOf(this, RemoteAuthorityResolverError.prototype);
+		}
+	}
+}
+
 export interface IRemoteAuthorityResolverService {
 
 	_serviceBrand: any;