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<!doctype html> <html lang="en"> <head> <title>Code coverage report for src/utils/internal/error-handler/errorHandler.ts</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../../../../prettify.css" /> <link rel="stylesheet" href="../../../../base.css" /> <link rel="shortcut icon" type="image/x-icon" href="../../../../favicon.png" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <style type='text/css'> .coverage-summary .sorter { background-image: url(../../../../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1><a href="../../../../index.html">All files</a> / <a href="index.html">src/utils/internal/error-handler</a> errorHandler.ts</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 60.62% Statements 234/386 </div> <div class='fl pad1y space-right2'> 82.71% Branches 67/81 </div> <div class='fl pad1y space-right2'> 41.66% Functions 5/12 </div> <div class='fl pad1y space-right2'> 60.62% Lines 234/386 </div> </div> Press n or j to go to the next uncovered block, b, p or k for the previous block. <template id="filterTemplate"> <div class="quiet"> Filter: <input type="search" id="fileSearch"> </div> </template> </div> <div class='status-line medium'></div> <pre><table class="coverage"> <tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a> <a name='L2'></a><a href='#L2'>2</a> <a name='L3'></a><a href='#L3'>3</a> <a name='L4'></a><a href='#L4'>4</a> <a name='L5'></a><a href='#L5'>5</a> <a name='L6'></a><a href='#L6'>6</a> <a name='L7'></a><a href='#L7'>7</a> <a name='L8'></a><a href='#L8'>8</a> <a name='L9'></a><a href='#L9'>9</a> <a name='L10'></a><a href='#L10'>10</a> <a name='L11'></a><a href='#L11'>11</a> <a name='L12'></a><a href='#L12'>12</a> <a name='L13'></a><a href='#L13'>13</a> <a name='L14'></a><a href='#L14'>14</a> <a name='L15'></a><a href='#L15'>15</a> <a name='L16'></a><a href='#L16'>16</a> <a name='L17'></a><a href='#L17'>17</a> <a 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href='#L599'>599</a> <a name='L600'></a><a href='#L600'>600</a> <a name='L601'></a><a href='#L601'>601</a> <a name='L602'></a><a href='#L602'>602</a> <a name='L603'></a><a href='#L603'>603</a> <a name='L604'></a><a href='#L604'>604</a> <a name='L605'></a><a href='#L605'>605</a> <a name='L606'></a><a href='#L606'>606</a> <a name='L607'></a><a href='#L607'>607</a> <a name='L608'></a><a href='#L608'>608</a> <a name='L609'></a><a href='#L609'>609</a> <a name='L610'></a><a href='#L610'>610</a> <a name='L611'></a><a href='#L611'>611</a> <a name='L612'></a><a href='#L612'>612</a> <a name='L613'></a><a href='#L613'>613</a> <a name='L614'></a><a href='#L614'>614</a> <a name='L615'></a><a href='#L615'>615</a> <a name='L616'></a><a href='#L616'>616</a> <a name='L617'></a><a href='#L617'>617</a> <a name='L618'></a><a href='#L618'>618</a> <a name='L619'></a><a href='#L619'>619</a> <a name='L620'></a><a href='#L620'>620</a> <a name='L621'></a><a href='#L621'>621</a> <a name='L622'></a><a href='#L622'>622</a> <a name='L623'></a><a href='#L623'>623</a> <a name='L624'></a><a href='#L624'>624</a> <a name='L625'></a><a href='#L625'>625</a> <a name='L626'></a><a href='#L626'>626</a></td><td class="line-coverage quiet">            1x   1x 1x 1x     1x         1x                                 1x                 1x 34x 1x 1x   33x 33x     33x 33x 33x 34x 6x 6x     33x 540x 540x 540x 540x     540x     33x 249x 249x 245x 249x 4x 4x 249x   23x 23x 22x 22x 21x 34x 1x 1x 22x 34x                 1x 50x 50x 50x   50x 50x 9x 9x 9x 9x 9x 9x 9x 9x     50x 50x 50x 50x 50x 50x 50x 50x 50x 50x   50x 50x 50x 50x 50x   50x 50x   50x 50x 23x 5x 5x 45x   50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 49x 49x   50x     50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x     50x 50x 50x       50x       50x 23x 23x   23x 23x 23x 50x 27x 27x 27x 27x 7x 20x 20x 20x 27x   50x 50x 50x 50x 50x 1x 50x 1x 1x   50x 50x 45x 5x   50x 50x 41x 9x   50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 48x 2x 50x 50x   50x 50x 50x 50x   50x 18x 18x 32x 50x                     1x 7x 7x 7x 7x 7x 7x   7x 4x 4x   4x 4x 4x   7x 1x 1x 7x 7x             1x 11x 1x 1x 1x 1x 1x 1x   1x 1x   10x 2x 2x 2x 2x 2x 2x   8x 8x 8x 8x 8x 11x                     1x 195x 195x 195x 195x 195x 195x   7x 7x 7x 7x 7x 195x                                               1x                                                           1x                                                                         1x                                                 1x                                                   1x                                                                                   1x                                                                                                                                                   1x                                                       1x  </td><td class="text"><pre class="prettyprint lang-js">/** * @fileoverview Main ErrorHandler implementation with logging and telemetry integration. * Enhanced with Result types, breadcrumb tracking, error sanitization, and retry logic. * @module src/utils/internal/error-handler/errorHandler */   import { SpanStatusCode, trace } from '@opentelemetry/api';   import { JsonRpcErrorCode, McpError } from '@/types-global/errors.js'; import { generateUUID, sanitizeInputForLogging } from '@/utils/index.js'; import { logger } from '@/utils/internal/logger.js'; import type { RequestContext } from '@/utils/internal/requestContext.js';   import { COMPILED_ERROR_PATTERNS, COMPILED_PROVIDER_PATTERNS, ERROR_TYPE_MAPPINGS, } from './mappings.js'; import { createSafeRegex, extractErrorCauseChain, getErrorMessage, getErrorName, } from './helpers.js'; import type { EnhancedErrorContext, ErrorHandlerOptions, ErrorMapping, ErrorRecoveryStrategy, Result, } from './types.js';   /** * A utility class providing static methods for comprehensive error handling. */ export class ErrorHandler { /** * Determines an appropriate `JsonRpcErrorCode` for a given error. * Checks `McpError` instances, `ERROR_TYPE_MAPPINGS`, and pre-compiled error patterns. * Now includes provider-specific patterns for better external service error classification. * Defaults to `JsonRpcErrorCode.InternalError`. * @param error - The error instance or value to classify. * @returns The determined error code. */ public static determineErrorCode(error: unknown): JsonRpcErrorCode { if (error instanceof McpError) { return error.code; }   const errorName = getErrorName(error); const errorMessage = getErrorMessage(error);   // Check against standard JavaScript error types const mappedFromType = ( ERROR_TYPE_MAPPINGS as Record<string, JsonRpcErrorCode> )[errorName]; if (mappedFromType) { return mappedFromType; }   // Check provider-specific patterns first (more specific) for (const mapping of COMPILED_PROVIDER_PATTERNS) { if ( mapping.compiledPattern.test(errorMessage) || mapping.compiledPattern.test(errorName) ) { return mapping.errorCode; } }   // Then check common error patterns (using pre-compiled patterns for performance) for (const mapping of COMPILED_ERROR_PATTERNS) { if ( mapping.compiledPattern.test(errorMessage) || mapping.compiledPattern.test(errorName) ) { return mapping.errorCode; } } // Special-case common platform errors if ( typeof error === 'object' && error !== null && 'name' in error && (error as { name?: string }).name === 'AbortError' ) { return JsonRpcErrorCode.Timeout; } return JsonRpcErrorCode.InternalError; }   /** * Handles an error with consistent logging and optional transformation. * Sanitizes input, determines error code, logs details, and can rethrow. * @param error - The error instance or value that occurred. * @param options - Configuration for handling the error. * @returns The handled (and potentially transformed) error instance. */ public static handleError( error: unknown, options: ErrorHandlerOptions, ): Error { // --- OpenTelemetry Integration --- const activeSpan = trace.getActiveSpan(); if (activeSpan) { if (error instanceof Error) { activeSpan.recordException(error); } activeSpan.setStatus({ code: SpanStatusCode.ERROR, message: error instanceof Error ? error.message : String(error), }); } // --- End OpenTelemetry Integration ---   const { context = {}, operation, input, rethrow = false, errorCode: explicitErrorCode, includeStack = true, critical = false, errorMapper, } = options;   const sanitizedInput = input !== undefined ? sanitizeInputForLogging(input) : undefined; const originalErrorName = getErrorName(error); const originalErrorMessage = getErrorMessage(error); const originalStack = error instanceof Error ? error.stack : undefined;   let finalError: Error; let loggedErrorCode: JsonRpcErrorCode;   const errorDataSeed = error instanceof McpError && typeof error.data === 'object' && error.data !== null ? { ...error.data } : {};   const consolidatedData: Record<string, unknown> = { ...errorDataSeed, ...context, originalErrorName, originalMessage: originalErrorMessage, }; if ( originalStack && !(error instanceof McpError && error.data?.originalStack) ) { consolidatedData.originalStack = originalStack; }   const cause = error instanceof Error ? error : undefined;   // Extract full cause chain with circular reference detection const causeChain = extractErrorCauseChain(error); if (causeChain.length > 0) { const rootCause = causeChain[causeChain.length - 1]; if (rootCause) { consolidatedData['rootCause'] = { name: rootCause.name, message: rootCause.message, }; } consolidatedData['causeChain'] = causeChain; }   // Add breadcrumbs from enhanced context if present if ( context && 'metadata' in context && context.metadata && typeof context.metadata === 'object' && 'breadcrumbs' in context.metadata ) { consolidatedData['breadcrumbs'] = context.metadata.breadcrumbs; }   if (error instanceof McpError) { loggedErrorCode = error.code; finalError = errorMapper ? errorMapper(error) : new McpError(error.code, error.message, consolidatedData, { cause, }); } else { loggedErrorCode = explicitErrorCode || ErrorHandler.determineErrorCode(error); const message = `Error in ${operation}: ${originalErrorMessage}`; finalError = errorMapper ? errorMapper(error) : new McpError(loggedErrorCode, message, consolidatedData, { cause, }); }   if ( finalError !== error && error instanceof Error && finalError instanceof Error && !finalError.stack && error.stack ) { finalError.stack = error.stack; }   const logRequestId = typeof context.requestId === 'string' && context.requestId ? context.requestId : generateUUID();   const logTimestamp = typeof context.timestamp === 'string' && context.timestamp ? context.timestamp : new Date().toISOString();   const stack = finalError instanceof Error ? finalError.stack : originalStack; const logContext: RequestContext = { requestId: logRequestId, timestamp: logTimestamp, operation, input: sanitizedInput, critical, errorCode: loggedErrorCode, originalErrorType: originalErrorName, finalErrorType: getErrorName(finalError), ...Object.fromEntries( Object.entries(context).filter( ([key]) => key !== 'requestId' && key !== 'timestamp', ), ), errorData: finalError instanceof McpError && finalError.data ? finalError.data : consolidatedData, ...(includeStack && stack ? { stack } : {}), };   logger.error( `Error in ${operation}: ${finalError.message || originalErrorMessage}`, logContext, );   if (rethrow) { throw finalError; } return finalError; }   /** * Maps an error to a specific error type `T` based on `ErrorMapping` rules. * Returns original/default error if no mapping matches. * @template T The target error type, extending `Error`. * @param error - The error instance or value to map. * @param mappings - An array of mapping rules to apply. * @param defaultFactory - Optional factory for a default error if no mapping matches. * @returns The mapped error of type `T`, or the original/defaulted error. */ public static mapError<T extends Error>( error: unknown, mappings: ReadonlyArray<ErrorMapping<T>>, defaultFactory?: (error: unknown, context?: Record<string, unknown>) => T, ): T | Error { const errorMessage = getErrorMessage(error); const errorName = getErrorName(error);   for (const mapping of mappings) { const regex = createSafeRegex(mapping.pattern); if (regex.test(errorMessage) || regex.test(errorName)) { // c8 ignore next return mapping.factory(error, mapping.additionalContext); } }   if (defaultFactory) { return defaultFactory(error); } return error instanceof Error ? error : new Error(String(error)); }   /** * Formats an error into a consistent object structure for API responses or structured logging. * @param error - The error instance or value to format. * @returns A structured representation of the error. */ public static formatError(error: unknown): Record<string, unknown> { if (error instanceof McpError) { return { code: error.code, message: error.message, data: typeof error.data === 'object' && error.data !== null ? error.data : {}, }; }   if (error instanceof Error) { return { code: ErrorHandler.determineErrorCode(error), message: error.message, data: { errorType: error.name || 'Error' }, }; }   return { code: JsonRpcErrorCode.UnknownError, message: getErrorMessage(error), data: { errorType: getErrorName(error) }, }; }   /** * Safely executes a function (sync or async) and handles errors using `ErrorHandler.handleError`. * The error is always rethrown. * @template T The expected return type of the function `fn`. * @param fn - The function to execute. * @param options - Error handling options (excluding `rethrow`). * @returns A promise resolving with the result of `fn` if successful. * @throws {McpError | Error} The error processed by `ErrorHandler.handleError`. */ public static async tryCatch<T>( fn: () => Promise<T> | T, options: Omit<ErrorHandlerOptions, 'rethrow'>, ): Promise<T> { try { return await Promise.resolve(fn()); } catch (caughtError) { // ErrorHandler.handleError will return the error to be thrown. throw ErrorHandler.handleError(caughtError, { ...options, rethrow: true, }); } }   /** * Executes a function and returns a Result type instead of throwing. * Enables functional error handling following Railway Oriented Programming pattern. * @template T The expected return type * @param fn - The function to execute * @param options - Error handling options (excluding `rethrow`) * @returns Result<T, McpError> - Success or error wrapped in Result type * * @example * ```typescript * const result = await ErrorHandler.tryAsResult( * () => dangerousOperation(), * { operation: 'dangerousOp', context } * ); * * if (result.ok) { * console.log('Success:', result.value); * } else { * console.error('Error:', result.error.message); * } * ``` */ public static async tryAsResult<T>( fn: () => Promise<T> | T, options: Omit<ErrorHandlerOptions, 'rethrow'>, ): Promise<Result<T, McpError>> { try { const value = await Promise.resolve(fn()); return { ok: true, value }; } catch (caughtError) { const error = ErrorHandler.handleError(caughtError, { ...options, rethrow: false, }) as McpError; return { ok: false, error }; } }   /** * Helper to map a Result value through a transformation function. * @template T Input type * @template U Output type * @param result - The result to map * @param fn - Transformation function * @returns Mapped result * * @example * ```typescript * const userResult = await getUserById(id); * const nameResult = ErrorHandler.mapResult(userResult, user => user.name); * ``` */ public static mapResult<T, U>( result: Result<T, McpError>, fn: (value: T) => U, ): Result<U, McpError> { if (result.ok) { try { return { ok: true, value: fn(result.value) }; } catch (error) { return { ok: false, error: new McpError( JsonRpcErrorCode.InternalError, `Error mapping result: ${getErrorMessage(error)}`, ), }; } } return result; }   /** * Helper to chain Result-returning operations (flatMap / bind). * @template T Input type * @template U Output type * @param result - The result to chain * @param fn - Function that returns a new Result * @returns Chained result * * @example * ```typescript * const userResult = await getUserById(id); * const postsResult = ErrorHandler.flatMapResult( * userResult, * user => getPostsByUserId(user.id) * ); * ``` */ public static flatMapResult<T, U>( result: Result<T, McpError>, fn: (value: T) => Result<U, McpError>, ): Result<U, McpError> { if (result.ok) { return fn(result.value); } return result; }   /** * Provides a fallback value if Result is an error. * @template T Value type * @param result - The result to recover from * @param fallback - Fallback value or function * @returns T value (either success value or fallback) * * @example * ```typescript * const user = ErrorHandler.recoverResult( * userResult, * { id: 'guest', name: 'Guest User' } * ); * ``` */ public static recoverResult<T>( result: Result<T, McpError>, fallback: T | ((error: McpError) => T), ): T { if (result.ok) { return result.value; } return typeof fallback === 'function' ? (fallback as (error: McpError) => T)(result.error) : fallback; }   /** * Adds a breadcrumb to the error context for tracking execution path. * @param context - The request context to add breadcrumb to * @param operation - Operation name * @param additionalData - Optional additional context * @returns Updated context with breadcrumb * * @example * ```typescript * let context = requestContextService.createRequestContext({ operation: 'initial' }); * context = ErrorHandler.addBreadcrumb(context as EnhancedErrorContext, 'step1'); * context = ErrorHandler.addBreadcrumb(context, 'step2', { userId: '123' }); * ``` */ public static addBreadcrumb( context: EnhancedErrorContext, operation: string, additionalData?: Record<string, unknown>, ): EnhancedErrorContext { const breadcrumbs = context.metadata?.breadcrumbs || [];   breadcrumbs.push({ timestamp: new Date().toISOString(), operation, // Only include context if it exists (exact optional property types) ...(additionalData !== undefined ? { context: additionalData } : {}), });   return { ...context, metadata: { ...context.metadata, breadcrumbs, }, }; }   /** * Executes a function with automatic retry logic and exponential backoff. * Implements resilience patterns for distributed systems. * @template T Return type * @param fn - Function to execute * @param options - Error handling options * @param strategy - Retry strategy configuration * @returns Promise resolving to result or throwing after exhausting retries * * @example * ```typescript * const strategy = ErrorHandler.createExponentialBackoffStrategy(3); * const result = await ErrorHandler.tryCatchWithRetry( * () => fetchFromUnreliableAPI(), * { operation: 'fetchAPI', context }, * strategy * ); * ``` */ public static async tryCatchWithRetry<T>( fn: () => Promise<T> | T, options: Omit<ErrorHandlerOptions, 'rethrow'>, strategy: ErrorRecoveryStrategy, ): Promise<T> { let lastError: Error | undefined;   for (let attempt = 1; attempt <= strategy.maxAttempts; attempt++) { try { return await Promise.resolve(fn()); } catch (caughtError) { lastError = caughtError instanceof Error ? caughtError : new Error(String(caughtError));   if ( attempt < strategy.maxAttempts && strategy.shouldRetry(lastError, attempt) ) { const delay = strategy.getRetryDelay(attempt);   const retryContext: RequestContext = { ...options.context, requestId: (options.context?.requestId as string) || generateUUID(), timestamp: new Date().toISOString(), operation: options.operation, error: lastError.message, attempt, };   logger.warning( `Retry attempt ${attempt}/${strategy.maxAttempts} after ${delay}ms`, retryContext, );   strategy.onRetry?.(lastError, attempt);   // Wait before retry await new Promise((resolve) => setTimeout(resolve, delay)); } else { // Max attempts reached or error not retryable throw ErrorHandler.handleError(lastError, { ...options, rethrow: true, context: { ...options.context, retryAttempts: attempt, finalAttempt: true, }, }); } } }   // Should never reach here, but TypeScript requires it throw ErrorHandler.handleError(lastError!, { ...options, rethrow: true, }); }   /** * Creates a default exponential backoff retry strategy. * @param maxAttempts - Maximum retry attempts (default: 3) * @param baseDelay - Base delay in ms (default: 1000) * @param maxDelay - Maximum delay in ms (default: 30000) * @returns ErrorRecoveryStrategy * * @example * ```typescript * const strategy = ErrorHandler.createExponentialBackoffStrategy(5, 500, 10000); * ``` */ public static createExponentialBackoffStrategy( maxAttempts = 3, baseDelay = 1000, maxDelay = 30000, ): ErrorRecoveryStrategy { return { maxAttempts, shouldRetry: (error: Error) => { // Don't retry on validation errors or unauthorized if (error instanceof McpError) { const nonRetryableCodes = [ JsonRpcErrorCode.ValidationError, JsonRpcErrorCode.Unauthorized, JsonRpcErrorCode.Forbidden, JsonRpcErrorCode.NotFound, ]; return !nonRetryableCodes.includes(error.code); } return true; }, getRetryDelay: (attemptNumber: number) => { // Exponential backoff: baseDelay * 2^(attempt - 1) with jitter const exponentialDelay = baseDelay * Math.pow(2, attemptNumber - 1); const jitter = Math.random() * 0.3 * exponentialDelay; // 30% jitter return Math.min(exponentialDelay + jitter, maxDelay); }, }; } }  </pre></td></tr></table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a> at 2025-10-15T17:09:47.939Z </div> <script src="../../../../prettify.js"></script> <script> window.onload = function () { prettyPrint(); }; </script> <script src="../../../../sorter.js"></script> <script src="../../../../block-navigation.js"></script> </body> </html>

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