@cyanheads/git-mcp-server
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An MCP (Model Context Protocol) server enabling LLMs and AI agents to interact with Git repositories. Provides tools for comprehensive Git operations including clone, commit, branch, diff, log, status, push, pull, merge, rebase, worktree, tag management,
269 lines • 9.82 kB
JavaScript
import { BaseErrorCode, McpError } from "../../types-global/errors.js"; // Corrected path
import { logger } from "./logger.js";
import { sanitizeInputForLogging } from "../index.js"; // Import from main barrel file
/**
* Simple mapper that maps error types to error codes
*/
const ERROR_TYPE_MAPPINGS = {
SyntaxError: BaseErrorCode.VALIDATION_ERROR,
TypeError: BaseErrorCode.VALIDATION_ERROR,
ReferenceError: BaseErrorCode.INTERNAL_ERROR,
RangeError: BaseErrorCode.VALIDATION_ERROR,
URIError: BaseErrorCode.VALIDATION_ERROR,
EvalError: BaseErrorCode.INTERNAL_ERROR,
};
/**
* Common error patterns for automatic classification
*/
const COMMON_ERROR_PATTERNS = [
// Authentication related errors
{
pattern: /auth|unauthorized|unauthenticated|not.*logged.*in|invalid.*token|expired.*token/i,
errorCode: BaseErrorCode.UNAUTHORIZED,
},
// Permission related errors
{
pattern: /permission|forbidden|access.*denied|not.*allowed/i,
errorCode: BaseErrorCode.FORBIDDEN,
},
// Not found errors
{
pattern: /not.*found|missing|no.*such|doesn't.*exist|couldn't.*find/i,
errorCode: BaseErrorCode.NOT_FOUND,
},
// Validation errors
{
pattern: /invalid|validation|malformed|bad request|wrong format/i,
errorCode: BaseErrorCode.VALIDATION_ERROR,
},
// Conflict errors
{
pattern: /conflict|already.*exists|duplicate|unique.*constraint/i,
errorCode: BaseErrorCode.CONFLICT,
},
// Rate limiting
{
pattern: /rate.*limit|too.*many.*requests|throttled/i,
errorCode: BaseErrorCode.RATE_LIMITED,
},
// Timeout errors
{
pattern: /timeout|timed.*out|deadline.*exceeded/i,
errorCode: BaseErrorCode.TIMEOUT,
},
// External service errors
{
pattern: /service.*unavailable|bad.*gateway|gateway.*timeout/i,
errorCode: BaseErrorCode.SERVICE_UNAVAILABLE,
},
];
/**
* Get a readable name for an error
* @param error Error to get name for
* @returns User-friendly error name
*/
function getErrorName(error) {
if (error instanceof Error) {
return error.name || "Error";
}
if (error === null) {
return "NullError";
}
if (error === undefined) {
return "UndefinedError";
}
return typeof error === "object" ? "ObjectError" : "UnknownError";
}
/**
* Get a message from an error
* @param error Error to get message from
* @returns Error message
*/
function getErrorMessage(error) {
if (error instanceof Error) {
return error.message;
}
if (error === null) {
return "Null error occurred";
}
if (error === undefined) {
return "Undefined error occurred";
}
return typeof error === "string" ? error : String(error);
}
/**
* Error handler utility class with various error handling methods
*/
export class ErrorHandler {
/**
* Determine the appropriate error code for an error based on patterns and type
* @param error The error to classify
* @returns The appropriate error code
*/
static determineErrorCode(error) {
// If it's already an McpError, use its code
if (error instanceof McpError) {
return error.code;
}
const errorName = getErrorName(error);
const errorMessage = getErrorMessage(error);
// Check if the error type has a direct mapping
const mappedError = ERROR_TYPE_MAPPINGS[errorName];
if (mappedError) {
return mappedError;
}
// Check for common error patterns
for (const pattern of COMMON_ERROR_PATTERNS) {
const regex = pattern.pattern instanceof RegExp
? pattern.pattern
: new RegExp(pattern.pattern, "i");
if (regex.test(errorMessage) || regex.test(errorName)) {
return pattern.errorCode;
}
}
// Default to internal error if no pattern matches
return BaseErrorCode.INTERNAL_ERROR;
}
/**
* Handle operation errors with consistent logging and transformation
* @param error The error that occurred
* @param options Error handling options
* @returns The transformed error
*/
static handleError(error, options) {
const { context, operation, input, rethrow = false, errorCode: explicitErrorCode, includeStack = true, critical = false, } = options;
// If it's already an McpError, use it directly but apply additional context
if (error instanceof McpError) {
const existingDetails = typeof error.details === "object" && error.details !== null
? error.details
: {};
const newDetails = { ...existingDetails, ...context };
// Create a new error to avoid mutating a readonly property
const updatedError = new McpError(error.code, error.message, newDetails);
// Log the error with sanitized input
logger.error(`Error in ${operation}: ${updatedError.message}`, {
errorCode: updatedError.code,
requestId: context?.requestId,
input: input ? sanitizeInputForLogging(input) : undefined,
stack: includeStack ? updatedError.stack : undefined,
critical,
...context,
});
if (rethrow) {
throw updatedError;
}
// Ensure the function returns an Error type
return updatedError;
}
// Sanitize input for logging
const sanitizedInput = input ? sanitizeInputForLogging(input) : undefined;
// Log the error with consistent format
logger.error(`Error in ${operation}: ${getErrorMessage(error)}`, {
error: getErrorMessage(error), // Use helper function
errorType: getErrorName(error),
input: sanitizedInput,
requestId: context?.requestId,
stack: includeStack && error instanceof Error ? error.stack : undefined,
critical,
...context,
});
// Choose the error code (explicit > determined > default)
const errorCode = explicitErrorCode ||
ErrorHandler.determineErrorCode(error) ||
BaseErrorCode.INTERNAL_ERROR;
// Transform to appropriate error type
let transformedError;
if (options.errorMapper) {
transformedError = options.errorMapper(error);
}
else {
transformedError = new McpError(errorCode, `Error in ${operation}: ${getErrorMessage(error)}`, // Use helper function
{
originalError: getErrorName(error),
...context,
});
}
// Rethrow if requested
if (rethrow) {
throw transformedError;
}
// Ensure the function returns an Error type
return transformedError;
}
/**
* Map an error to a specific error type based on error message patterns
* @param error The error to map
* @param mappings Array of pattern and factory mappings
* @param defaultFactory Default factory function if no pattern matches
* @returns The mapped error
*/
static mapError(error, mappings, defaultFactory) {
// If it's already the target type and we have a default factory to check against, return it
if (defaultFactory && error instanceof Error) {
const defaultInstance = defaultFactory(error);
if (error.constructor === defaultInstance.constructor) {
return error;
}
}
const errorMessage = getErrorMessage(error);
// Check each pattern and return the first match
for (const mapping of mappings) {
const matches = mapping.pattern instanceof RegExp
? mapping.pattern.test(errorMessage)
: errorMessage.includes(mapping.pattern);
if (matches) {
return mapping.factory(error, mapping.additionalContext);
}
}
// Return default or original error
if (defaultFactory) {
return defaultFactory(error);
}
return error instanceof Error ? error : new Error(String(error));
}
// Removed createErrorMapper method for simplification
/**
* Format an error for consistent response structure
* @param error The error to format
* @returns Formatted error object
*/
static formatError(error) {
if (error instanceof McpError) {
return {
code: error.code,
message: error.message,
// Ensure details is an object
details: typeof error.details === "object" && error.details !== null
? error.details
: {},
};
}
if (error instanceof Error) {
return {
code: ErrorHandler.determineErrorCode(error),
message: error.message,
details: { errorType: error.name },
};
}
return {
code: BaseErrorCode.UNKNOWN_ERROR,
message: String(error),
details: { errorType: "string" },
};
}
/**
* Safely execute a function and handle any errors
* @param fn Function to execute
* @param options Error handling options
* @returns The result of the function or error
*/
static async tryCatch(fn, options) {
try {
return await fn();
}
catch (error) {
throw ErrorHandler.handleError(error, { ...options, rethrow: true });
}
}
}
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