Files
llm-observability-mcp/src/utils/error.util.ts

133 lines
2.7 KiB
TypeScript

import { Logger } from './logger.util.js';
/**
* Error types for classification
*/
export enum ErrorType {
AUTH_MISSING = 'AUTH_MISSING',
AUTH_INVALID = 'AUTH_INVALID',
API_ERROR = 'API_ERROR',
UNEXPECTED_ERROR = 'UNEXPECTED_ERROR',
}
/**
* Custom error class with type classification
*/
export class McpError extends Error {
type: ErrorType;
statusCode?: number;
originalError?: unknown;
constructor(
message: string,
type: ErrorType,
statusCode?: number,
originalError?: unknown,
) {
super(message);
this.name = 'McpError';
this.type = type;
this.statusCode = statusCode;
this.originalError = originalError;
}
}
/**
* Create an unexpected error
*/
export function createUnexpectedError(
message: string = 'An unexpected error occurred',
originalError?: unknown,
): McpError {
return new McpError(
message,
ErrorType.UNEXPECTED_ERROR,
undefined,
originalError,
);
}
/**
* Ensure an error is an McpError
*/
export function ensureMcpError(error: unknown): McpError {
if (error instanceof McpError) {
return error;
}
if (error instanceof Error) {
return createUnexpectedError(error.message, error);
}
return createUnexpectedError(String(error));
}
/**
* Get the deepest original error from an error chain
* @param error The error to extract the original cause from
* @returns The deepest original error or the error itself
*/
export function getDeepOriginalError(error: unknown): unknown {
if (!error) {
return error;
}
let current = error;
let depth = 0;
const maxDepth = 10; // Prevent infinite recursion
while (
depth < maxDepth &&
current instanceof Error &&
'originalError' in current &&
current.originalError
) {
current = current.originalError;
depth++;
}
return current;
}
/**
* Format error for MCP tool response
*/
export function formatErrorForMcpTool(error: unknown): {
content: Array<{ type: 'text'; text: string }>;
metadata?: {
errorType: ErrorType;
statusCode?: number;
errorDetails?: unknown;
};
} {
const methodLogger = Logger.forContext(
'utils/error.util.ts',
'formatErrorForMcpTool',
);
const mcpError = ensureMcpError(error);
methodLogger.error(`${mcpError.type} error`, mcpError);
// Get the deep original error for additional context
const originalError = getDeepOriginalError(mcpError.originalError);
// Safely extract details from the original error
const errorDetails =
originalError instanceof Error
? { message: originalError.message }
: originalError;
return {
content: [
{
type: 'text' as const,
text: `Error: ${mcpError.message}`,
},
],
metadata: {
errorType: mcpError.type,
statusCode: mcpError.statusCode,
errorDetails,
},
};
}