introuce networkError as a new type for CAPI errors (#500)

* introuce networkError as a new type for CAPI errors

Fixes microsoft/vscode-internalbacklog/issues/5687

* fix errors

Author: isidorn

src/extension/prompt/node/chatMLFetcher.ts

@@ -654,14 +654,14 @@ export class ChatMLFetcherImpl extends AbstractChatMLFetcher {
 		// this.logger.exception(err, `Error on conversation request`);
 		if (fetcher.isInternetDisconnectedError(err)) {
 			return {
-				type: ChatFetchResponseType.Failed,
+				type: ChatFetchResponseType.NetworkError,
 				reason: `It appears you're not connected to the internet, please check your network connection and try again.`,
 				requestId: requestId,
 				serverRequestId: undefined,
 			};
 		} else if (fetcher.isFetcherError(err)) {
 			return {
-				type: ChatFetchResponseType.Failed,
+				type: ChatFetchResponseType.NetworkError,
 				reason: fetcher.getUserMessageForFetcherError(err),
 				requestId: requestId,
 				serverRequestId: undefined,

src/extension/prompt/node/defaultIntentRequestHandler.ts

@@ -457,6 +457,7 @@ export class DefaultIntentRequestHandler {
 				return chatResult;
 			}
 			case ChatFetchResponseType.BadRequest:
+			case ChatFetchResponseType.NetworkError:
 			case ChatFetchResponseType.Failed: {
 				const errorDetails = getErrorDetailsFromChatFetchError(fetchResult, (await this._authenticationService.getCopilotToken()).copilotPlan);
 				const chatResult = { errorDetails, metadata: metadataFragment };

src/extension/xtab/node/xtabProvider.ts

@@ -809,6 +809,7 @@ export class XtabProvider extends ChainedStatelessNextEditProvider {
 			case ChatFetchResponseType.BadRequest:
 			case ChatFetchResponseType.NotFound:
 			case ChatFetchResponseType.Failed:
+			case ChatFetchResponseType.NetworkError:
 			case ChatFetchResponseType.Unknown:
 				return new NoNextEditReason.FetchFailure(errors.fromUnknown(fetchError));
 		}

src/platform/chat/common/commonTypes.ts

@@ -97,6 +97,7 @@ export enum ChatFetchResponseType {
 	NotFound = 'notFound',
 	Failed = 'failed',
 	Unknown = 'unknown',
+	NetworkError = 'networkError',
 	AgentUnauthorized = 'agent_unauthorized',
 	AgentFailedDependency = 'agent_failed_dependency',
 	InvalidStatefulMarker = 'invalid_stateful_marker',
@@ -156,6 +157,10 @@ export type ChatFetchError =
 	 * unexpected went wrong.
 	 */
 	| { type: ChatFetchResponseType.Failed; reason: string; requestId: string; serverRequestId: string | undefined; streamError?: APIErrorResponse }
+	/**
+	 * We requested conversation, but didn't come up with any results because of a network error
+	 */
+	| { type: ChatFetchResponseType.NetworkError; reason: string; requestId: string; serverRequestId: string | undefined; streamError?: APIErrorResponse }
 	/**
 	 * We requested conversation, but didn't come up with any results for some "unknown"
 	 * reason, such as slur redaction or snippy.
@@ -274,6 +279,8 @@ export function getErrorDetailsFromChatFetchError(fetchResult: ChatFetchError, c
 		case ChatFetchResponseType.BadRequest:
 		case ChatFetchResponseType.Failed:
 			return { message: l10n.t(`Sorry, your request failed. Please try again. Request id: {0}\n\nReason: {1}`, fetchResult.requestId, fetchResult.reason) };
+		case ChatFetchResponseType.NetworkError:
+			return { message: l10n.t(`Sorry, there was a network error. Please try again later. Request id: {0}\n\nReason: {1}`, fetchResult.requestId, fetchResult.reason) };
 		case ChatFetchResponseType.Filtered:
 		case ChatFetchResponseType.PromptFiltered:
 			return {