@juspay/neurolink/dist/context/errorDetection.js

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/**
 * Context Overflow Error Detection
 *
 * Cross-provider regex patterns to detect context window overflow errors.
 * Modeled on Cline + pi-mono patterns.
 */
/**
 * Provider-specific error patterns for context overflow.
 *
 * IMPORTANT: Order matters for getContextOverflowProvider - more specific
 * patterns should be checked first. OpenAI patterns are very specific
 * (e.g., "This model's maximum context length is") so they come first.
 */
const OVERFLOW_PATTERNS = [
    {
        provider: "openai",
        patterns: [
            /This model's maximum context length is/i,
            /tokens\. However, (?:your messages|you requested)/i,
            /reduce the length of the messages/i,
            /Please reduce the length/i,
        ],
    },
    {
        provider: "azure",
        patterns: [/content_length_exceeded/i],
    },
    {
        provider: "google",
        patterns: [
            /RESOURCE_EXHAUSTED/i,
            /exceeds the maximum number of tokens/i,
            /content is too long/i,
            /request payload size exceeds/i,
            /input token limit/i,
        ],
    },
    {
        provider: "bedrock",
        patterns: [
            /ValidationException.*token/i,
            /Input is too long/i,
            /exceeds the model's maximum/i,
        ],
    },
    {
        provider: "mistral",
        patterns: [/context length exceeded/i, /maximum number of tokens/i],
    },
    {
        provider: "openrouter",
        patterns: [/context_length_exceeded/i],
    },
    {
        provider: "anthropic",
        patterns: [
            /prompt is too long/i,
            /input is too long/i,
            /too many tokens/i,
            /maximum context length/i,
        ],
    },
];
/**
 * Check if an error is a context overflow error from any provider.
 */
export function isContextOverflowError(error) {
    const errorMessage = extractErrorMessage(error);
    if (!errorMessage) {
        return false;
    }
    return OVERFLOW_PATTERNS.some(({ patterns }) => patterns.some((pattern) => pattern.test(errorMessage)));
}
/**
 * Identify which provider produced the context overflow error.
 */
export function getContextOverflowProvider(error) {
    const errorMessage = extractErrorMessage(error);
    if (!errorMessage) {
        return null;
    }
    for (const { provider, patterns } of OVERFLOW_PATTERNS) {
        if (patterns.some((pattern) => pattern.test(errorMessage))) {
            return provider;
        }
    }
    return null;
}
/**
 * Extract actual token counts from provider overflow error messages.
 *
 * Many providers include the actual/max token counts in their error messages:
 * - OpenAI: "This model's maximum context length is 128000 tokens. However, your messages resulted in 145000 tokens."
 * - Anthropic: "prompt is too long: 180000 tokens > 200000 token limit"
 * - Google: "exceeds the maximum number of tokens (180000 > 100000)"
 */
export function parseProviderOverflowDetails(error) {
    const message = extractErrorMessage(error);
    if (!message) {
        return null;
    }
    // Guard against excessively long inputs that could slow regex matching
    if (message.length > 2000) {
        return null;
    }
    // OpenAI pattern: "resulted in X tokens" + "maximum context length is Y"
    // Use single character-class number groups to prevent ReDoS (CodeQL: js/polynomial-redos)
    const openaiActual = message.match(/resulted\s+in\s+(\d[\d,]{0,19})\s*tokens/i);
    const openaiMax = message.match(/maximum\s+context\s+length\s+is\s+(\d[\d,]{0,19})/i);
    if (openaiActual && openaiMax) {
        return {
            actualTokens: parseInt(openaiActual[1].replace(/,/g, ""), 10),
            budgetTokens: parseInt(openaiMax[1].replace(/,/g, ""), 10),
        };
    }
    // Anthropic pattern: "X tokens > Y token limit" or "X tokens, limit Y"
    // Use single character-class number groups to prevent ReDoS (CodeQL: js/polynomial-redos)
    const anthropicMatch = message.match(/(\d[\d,]{0,19})\s*tokens?\s*[>:]\s*(\d[\d,]{0,19})/i);
    if (anthropicMatch) {
        return {
            actualTokens: parseInt(anthropicMatch[1].replace(/,/g, ""), 10),
            budgetTokens: parseInt(anthropicMatch[2].replace(/,/g, ""), 10),
        };
    }
    // Google pattern: "X > Y" or "X exceeds Y"
    // Use single character-class number groups to prevent ReDoS (CodeQL: js/polynomial-redos)
    const googleMatch = message.match(/(\d[\d,]{0,19})\s*(?:>|exceeds)\s*(\d[\d,]{0,19})/i);
    if (googleMatch) {
        return {
            actualTokens: parseInt(googleMatch[1].replace(/,/g, ""), 10),
            budgetTokens: parseInt(googleMatch[2].replace(/,/g, ""), 10),
        };
    }
    return null;
}
/**
 * Extract error message from various error formats.
 */
export function extractErrorMessage(error) {
    if (!error) {
        return null;
    }
    if (typeof error === "string") {
        return error;
    }
    if (error instanceof Error) {
        // Check nested error messages too
        const msg = error.message;
        const cause = error?.cause;
        if (cause instanceof Error) {
            return `${msg} ${cause.message}`;
        }
        return msg;
    }
    if (typeof error === "object") {
        const obj = error;
        if (typeof obj.message === "string") {
            return obj.message;
        }
        if (typeof obj.error === "string") {
            return obj.error;
        }
        if (typeof obj.error === "object" && obj.error !== null) {
            const nested = obj.error;
            if (typeof nested.message === "string") {
                return nested.message;
            }
        }
    }
    return null;
}