mcp-search-tools/dist/utils/retry.js

MCP server and client for web search and page viewing tools - DuckDuckGo search and web scraping

/**
 * Exponential backoff with jitter for retry operations
 * @param fn - Function to execute with retries
 * @param maxRetries - Maximum number of retry attempts
 * @param retryDelay - Base delay between attempts in milliseconds
 * @returns Result of the function execution
 */
export async function withRetry(fn, maxRetries = 3, retryDelay = 1000) {
    let attempt = 0;
    let lastError;
    while (attempt < maxRetries) {
        try {
            return await fn();
        }
        catch (error) {
            lastError = error;
            attempt++;
            // Skip retries for fatal errors
            if (isFatalError(error)) {
                break;
            }
            // Exponential backoff with jitter
            const delay = retryDelay * Math.pow(2, attempt) * (0.5 + Math.random());
            await new Promise((resolve) => setTimeout(resolve, delay));
        }
    }
    throw lastError;
}
/**
 * Checks if an error is fatal (should not be retried)
 * @param error - Error object
 */
function isFatalError(error) {
    // Check if error has statusCode property
    if (typeof error === 'object' && error !== null && 'statusCode' in error) {
        const statusCode = error.statusCode;
        // Fatal errors: 4xx (except 429), validation errors
        return (statusCode !== undefined &&
            statusCode >= 400 &&
            statusCode < 500 &&
            statusCode !== 429);
    }
    return false;
}
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