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Improve context length chat errors #258

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Improve context length chat errors #258

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63 changes: 52 additions & 11 deletions src/app/api/chat/route.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -258,22 +258,20 @@ export async function POST(request: Request) {
console.error("Stream error occurred:", error);

// Check if it's a 402 error and log it specifically
if (error && typeof error === "object") {
const errorStr = JSON.stringify(error);
if (
errorStr.includes("402") ||
errorStr.includes("requires more credits")
) {
console.error(
"OpenRouter credits exhausted - 402 error detected",
);
}
const errorText = getErrorText(error);
if (
errorText.includes("402") ||
errorText.includes("requires more credits")
) {
console.error(
"OpenRouter credits exhausted - 402 error detected",
);
}

// Send error to frontend - this will trigger onStreamError which calls stop()
dataStream.writeData({
type: "error",
message: "An error occurred while processing your request",
message: getStreamErrorMessage(errorText),
});

// Don't throw - just let the stream end naturally after sending error data
Expand Down Expand Up @@ -385,6 +383,49 @@ export async function POST(request: Request) {
}
}

function getStreamErrorMessage(errorText: string) {
if (isContextLengthError(errorText)) {
return "This chat is too long for the selected model's context window. Try starting a new chat, removing older messages, or switching to a model with a larger context window.";
}

return "An error occurred while processing your request";
}

function isContextLengthError(errorText: string) {
return [
"context length",
"context_length",
"context window",
"maximum context",
"max context",
"too many tokens",
"token limit",
"prompt is too long",
"input is too long",
"reduce the length",
].some((message) => errorText.includes(message));
}

function getErrorText(error: unknown): string {
if (error instanceof Error) {
return `${error.name} ${error.message} ${getErrorText(error.cause)}`.toLowerCase();
}

if (typeof error === "string") {
return error.toLowerCase();
}

if (!error) {
return "";
}

try {
return JSON.stringify(error).toLowerCase();
} catch {
return "";
}
}

async function generateTitleFromUserMessage(message: UIMessage) {
const { text: title } = await generateText("openai/gpt-4o-mini", {
system: `\n
Expand Down