Add error messaging for 429 errors (#1316)

packages/cli/src/ui/utils/errorParsing.ts

@@ -4,6 +4,11 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import { StructuredError } from '@gemini-cli/core';
+
+const RATE_LIMIT_ERROR_MESSAGE =
+  '\nPlease wait and try again later. To increase your limits, upgrade to a plan with higher limits, or use /auth to switch to using a paid API key from AI Studio at https://aistudio.google.com/apikey';
+
 export interface ApiError {
   error: {
     code: number;
@@ -23,34 +28,57 @@ function isApiError(error: unknown): error is ApiError {
   );
 }
 
-export function parseAndFormatApiError(errorMessage: string): string {
-  // The error message might be prefixed with some text, like "[Stream Error: ...]".
-  // We want to find the start of the JSON object.
-  const jsonStart = errorMessage.indexOf('{');
-  if (jsonStart === -1) {
-    return errorMessage; // Not a JSON error, return as is.
-  }
-
-  const jsonString = errorMessage.substring(jsonStart);
-
-  try {
-    const error = JSON.parse(jsonString) as unknown;
-    if (isApiError(error)) {
-      let finalMessage = error.error.message;
-      try {
-        // See if the message is a stringified JSON with another error
-        const nestedError = JSON.parse(finalMessage) as unknown;
-        if (isApiError(nestedError)) {
-          finalMessage = nestedError.error.message;
-        }
-      } catch (_e) {
-        // It's not a nested JSON error, so we just use the message as is.
-      }
-      return `API Error: ${finalMessage} (Status: ${error.error.status})`;
-    }
-  } catch (_e) {
-    // Not a valid JSON, fall through and return the original message.
-  }
-
-  return errorMessage;
+function isStructuredError(error: unknown): error is StructuredError {
+  return (
+    typeof error === 'object' &&
+    error !== null &&
+    'message' in error &&
+    typeof (error as StructuredError).message === 'string'
+  );
+}
+
+export function parseAndFormatApiError(error: unknown): string {
+  if (isStructuredError(error)) {
+    let text = `[API Error: ${error.message}]`;
+    if (error.status === 429) {
+      text += RATE_LIMIT_ERROR_MESSAGE;
+    }
+    return text;
+  }
+
+  // The error message might be a string containing a JSON object.
+  if (typeof error === 'string') {
+    const jsonStart = error.indexOf('{');
+    if (jsonStart === -1) {
+      return `[API Error: ${error}]`; // Not a JSON error, return as is.
+    }
+
+    const jsonString = error.substring(jsonStart);
+
+    try {
+      const parsedError = JSON.parse(jsonString) as unknown;
+      if (isApiError(parsedError)) {
+        let finalMessage = parsedError.error.message;
+        try {
+          // See if the message is a stringified JSON with another error
+          const nestedError = JSON.parse(finalMessage) as unknown;
+          if (isApiError(nestedError)) {
+            finalMessage = nestedError.error.message;
+          }
+        } catch (_e) {
+          // It's not a nested JSON error, so we just use the message as is.
+        }
+        let text = `[API Error: ${finalMessage} (Status: ${parsedError.error.status})]`;
+        if (parsedError.error.code === 429) {
+          text += RATE_LIMIT_ERROR_MESSAGE;
+        }
+        return text;
+      }
+    } catch (_e) {
+      // Not a valid JSON, fall through and return the original message.
+    }
+    return `[API Error: ${error}]`;
+  }
+
+  return '[API Error: An unknown error occurred.]';
 }