update

ts/errors/index.ts

@@ -0,0 +1,193 @@
+/**
+ * Platform Service Error System
+ * 
+ * This module provides a comprehensive error handling system for the Platform Service,
+ * with structured error types, error codes, and consistent patterns for logging and recovery.
+ */
+
+// Export error codes and types
+export * from './error.codes.js';
+
+// Export base error classes
+export * from './base.errors.js';
+
+// Export domain-specific error classes
+export * from './email.errors.js';
+export * from './mta.errors.js';
+export * from './reputation.errors.js';
+
+// Export utility function to create specific error types based on the error category
+import { getErrorClassForCategory } from './base.errors.js';
+export { getErrorClassForCategory };
+
+/**
+ * Create a typed error from a standard Error
+ * Useful for converting errors from external libraries or APIs
+ * 
+ * @param error Standard error to convert
+ * @param code Error code to assign
+ * @param contextData Additional context data
+ * @returns Typed PlatformError
+ */
+export function fromError(
+  error: Error,
+  code: string,
+  contextData: Record<string, any> = {}
+) {
+  // Import and use PlatformError
+  const { PlatformError } = require('./base.errors.js');
+  const { ErrorSeverity, ErrorCategory, ErrorRecoverability } = require('./error.codes.js');
+  
+  return new PlatformError(
+    error.message,
+    code,
+    ErrorSeverity.MEDIUM,
+    ErrorCategory.OPERATION,
+    ErrorRecoverability.NON_RECOVERABLE,
+    {
+      data: {
+        ...contextData,
+        originalError: {
+          name: error.name,
+          message: error.message,
+          stack: error.stack
+        }
+      }
+    }
+  );
+}
+
+/**
+ * Determine if an error is retryable
+ * 
+ * @param error Error to check
+ * @returns Boolean indicating if the error should be retried
+ */
+export function isRetryable(error: any): boolean {
+  // If it's our platform error, use its recoverability property
+  if (error && typeof error === 'object' && 'recoverability' in error) {
+    const { ErrorRecoverability } = require('./error.codes.js');
+    return error.recoverability === ErrorRecoverability.RECOVERABLE ||
+           error.recoverability === ErrorRecoverability.MAYBE_RECOVERABLE ||
+           error.recoverability === ErrorRecoverability.TRANSIENT;
+  }
+  
+  // Check if it's a network error (these are often transient)
+  if (error && typeof error === 'object' && error.code) {
+    const networkErrors = [
+      'ECONNRESET', 'ECONNREFUSED', 'ETIMEDOUT', 'EHOSTUNREACH',
+      'ENETUNREACH', 'ENOTFOUND', 'EPROTO', 'ECONNABORTED'
+    ];
+    
+    return networkErrors.includes(error.code);
+  }
+  
+  // By default, we can't determine if the error is retryable
+  return false;
+}
+
+/**
+ * Create a wrapped version of a function that catches errors
+ * and converts them to typed PlatformErrors
+ * 
+ * @param fn Function to wrap
+ * @param errorCode Default error code to use
+ * @param contextData Additional context data
+ * @returns Wrapped function
+ */
+export function withErrorHandling<T extends (...args: any[]) => Promise<any>>(
+  fn: T,
+  errorCode: string,
+  contextData: Record<string, any> = {}
+): T {
+  return (async function(...args: Parameters<T>): Promise<ReturnType<T>> {
+    try {
+      return await fn(...args);
+    } catch (error) {
+      if (error && typeof error === 'object' && 'code' in error) {
+        // Already a typed error, rethrow
+        throw error;
+      }
+      
+      throw fromError(
+        error instanceof Error ? error : new Error(String(error)),
+        errorCode,
+        {
+          ...contextData,
+          fnName: fn.name,
+          args: args.map(arg => 
+            typeof arg === 'object' 
+              ? '[Object]' 
+              : String(arg).substring(0, 100)
+          )
+        }
+      );
+    }
+  }) as T;
+}
+
+/**
+ * Retry a function with exponential backoff
+ * 
+ * @param fn Function to retry
+ * @param options Retry options
+ * @returns Function result or throws after max retries
+ */
+export async function retry<T>(
+  fn: () => Promise<T>,
+  options: {
+    maxRetries?: number;
+    initialDelay?: number;
+    maxDelay?: number;
+    backoffFactor?: number;
+    retryableErrors?: Array<string | RegExp>;
+  } = {}
+): Promise<T> {
+  const {
+    maxRetries = 3,
+    initialDelay = 1000,
+    maxDelay = 30000,
+    backoffFactor = 2,
+    retryableErrors = []
+  } = options;
+  
+  let lastError: Error;
+  
+  for (let attempt = 0; attempt <= maxRetries; attempt++) {
+    try {
+      return await fn();
+    } catch (error) {
+      lastError = error instanceof Error 
+        ? error 
+        : new Error(String(error));
+      
+      // Check if we should retry
+      const shouldRetry = attempt < maxRetries && (
+        isRetryable(error) ||
+        retryableErrors.some(pattern => {
+          if (typeof pattern === 'string') {
+            return lastError.message.includes(pattern);
+          }
+          return pattern.test(lastError.message);
+        })
+      );
+      
+      if (!shouldRetry) {
+        throw lastError;
+      }
+      
+      // Calculate delay with exponential backoff
+      const delay = Math.min(initialDelay * Math.pow(backoffFactor, attempt), maxDelay);
+      
+      // Add jitter to prevent thundering herd problem (±20%)
+      const jitter = 0.8 + Math.random() * 0.4;
+      const actualDelay = Math.floor(delay * jitter);
+      
+      // Wait before next retry
+      await new Promise(resolve => setTimeout(resolve, actualDelay));
+    }
+  }
+  
+  // This should never happen, but TypeScript needs it
+  throw lastError!;
+}