remote - use etag-check to prevent repeated loading

Author: jrieken

src/vs/workbench/services/files/electron-browser/fileService.ts

@@ -35,7 +35,7 @@ export class FileService implements IFileService {
 	private static readonly NET_VERSION_ERROR = 'System.MissingMethodException';
 	private static readonly NET_VERSION_ERROR_IGNORE_KEY = 'ignoreNetVersionError';
 
-	private raw: IFileService;
+	private raw: NodeFileService;
 
 	private toUnbind: IDisposable[];
 

src/vs/workbench/services/files/electron-browser/remoteFileService.ts

@@ -233,6 +233,15 @@ export class RemoteFileService extends FileService {
 		return this._withProvider(resource).then(provider => {
 
 			return this.resolveFile(resource).then(fileStat => {
+
+				if (options.etag === fileStat.etag) {
+					throw new FileOperationError(
+						localize('fileNotModifiedError', "File not modified since"),
+						FileOperationResult.FILE_NOT_MODIFIED_SINCE,
+						options
+					);
+				}
+
 				const guessEncoding = options.autoGuessEncoding;
 				const count = maxBufferLen(options);
 				const chunks: Buffer[] = [];