feat(429 handling): now handles 429 correctly

ts/client/index.ts

@@ -5,7 +5,7 @@ export { SmartRequest } from './smartrequest.js';
 export { CoreResponse } from '../core/index.js';
 
 // Export types
-export type { HttpMethod, ResponseType, FormField, RetryConfig, TimeoutConfig } from './types/common.js';
+export type { HttpMethod, ResponseType, FormField, RetryConfig, TimeoutConfig, RateLimitConfig } from './types/common.js';
 export { 
   PaginationStrategy,
   type TPaginationConfig as PaginationConfig,

ts/client/smartrequest.ts

@@ -3,7 +3,7 @@ import type { ICoreResponse } from '../core_base/types.js';
 import * as plugins from './plugins.js';
 import type { ICoreRequestOptions } from '../core_base/types.js';
 
-import type { HttpMethod, ResponseType, FormField } from './types/common.js';
+import type { HttpMethod, ResponseType, FormField, RateLimitConfig } from './types/common.js';
 import {
   type TPaginationConfig,
   PaginationStrategy,
@@ -14,6 +14,32 @@ import {
 } from './types/pagination.js';
 import { createPaginatedResponse } from './features/pagination.js';
 
+/**
+ * Parse Retry-After header value to milliseconds
+ * @param retryAfter - The Retry-After header value (seconds or HTTP date)
+ * @returns Delay in milliseconds
+ */
+function parseRetryAfter(retryAfter: string | string[]): number {
+  // Handle array of values (take first)
+  const value = Array.isArray(retryAfter) ? retryAfter[0] : retryAfter;
+  
+  if (!value) return 0;
+  
+  // Try to parse as seconds (number)
+  const seconds = parseInt(value, 10);
+  if (!isNaN(seconds)) {
+    return seconds * 1000;
+  }
+  
+  // Try to parse as HTTP date
+  const retryDate = new Date(value);
+  if (!isNaN(retryDate.getTime())) {
+    return Math.max(0, retryDate.getTime() - Date.now());
+  }
+  
+  return 0;
+}
+
 /**
  * Modern fluent client for making HTTP requests
  */
@@ -23,6 +49,7 @@ export class SmartRequest<T = any> {
   private _retries: number = 0;
   private _queryParams: Record<string, string> = {};
   private _paginationConfig?: TPaginationConfig;
+  private _rateLimitConfig?: RateLimitConfig;
 
   /**
    * Create a new SmartRequest instance
@@ -106,6 +133,21 @@ export class SmartRequest<T = any> {
     return this;
   }
 
+  /**
+   * Enable automatic 429 (Too Many Requests) handling with configurable backoff
+   */
+  handle429Backoff(config?: RateLimitConfig): this {
+    this._rateLimitConfig = {
+      maxRetries: config?.maxRetries ?? 3,
+      respectRetryAfter: config?.respectRetryAfter ?? true,
+      maxWaitTime: config?.maxWaitTime ?? 60000,
+      fallbackDelay: config?.fallbackDelay ?? 1000,
+      backoffFactor: config?.backoffFactor ?? 2,
+      onRateLimit: config?.onRateLimit
+    };
+    return this;
+  }
+
   /**
    * Set HTTP headers
    */
@@ -142,6 +184,17 @@ export class SmartRequest<T = any> {
     return this;
   }
 
+  /**
+   * Set additional request options
+   */
+  options(options: Partial<ICoreRequestOptions>): this {
+    this._options = {
+      ...this._options,
+      ...options
+    };
+    return this;
+  }
+
   /**
    * Set the Accept header to indicate what content type is expected
    */
@@ -305,14 +358,55 @@ export class SmartRequest<T = any> {
 
     this._options.queryParams = this._queryParams;
 
-    // Handle retry logic
+    // Track rate limit attempts separately
+    let rateLimitAttempt = 0;
     let lastError: Error;
 
+    // Main retry loop
     for (let attempt = 0; attempt <= this._retries; attempt++) {
       try {
         const request = new CoreRequest(this._url, this._options as any);
-        const response = await request.fire();
-        return response as ICoreResponse<R>;
+        const response = await request.fire() as ICoreResponse<R>;
+        
+        // Check for 429 status if rate limit handling is enabled
+        if (this._rateLimitConfig && response.status === 429) {
+          if (rateLimitAttempt >= this._rateLimitConfig.maxRetries) {
+            // Max rate limit retries reached, return the 429 response
+            return response;
+          }
+
+          let waitTime: number;
+          
+          if (this._rateLimitConfig.respectRetryAfter && response.headers['retry-after']) {
+            // Parse Retry-After header
+            waitTime = parseRetryAfter(response.headers['retry-after']);
+            
+            // Cap wait time to maxWaitTime
+            waitTime = Math.min(waitTime, this._rateLimitConfig.maxWaitTime);
+          } else {
+            // Use exponential backoff
+            waitTime = Math.min(
+              this._rateLimitConfig.fallbackDelay * Math.pow(this._rateLimitConfig.backoffFactor, rateLimitAttempt),
+              this._rateLimitConfig.maxWaitTime
+            );
+          }
+
+          // Call rate limit callback if provided
+          if (this._rateLimitConfig.onRateLimit) {
+            this._rateLimitConfig.onRateLimit(rateLimitAttempt + 1, waitTime);
+          }
+
+          // Wait before retrying
+          await new Promise(resolve => setTimeout(resolve, waitTime));
+          
+          rateLimitAttempt++;
+          // Decrement attempt to retry this attempt
+          attempt--;
+          continue;
+        }
+        
+        // Success or non-429 error response
+        return response;
       } catch (error) {
         lastError = error as Error;
 

ts/client/types/common.ts

@@ -46,4 +46,16 @@ export interface TimeoutConfig {
   connection?: number;      // Connection timeout in ms
   socket?: number;          // Socket idle timeout in ms
   response?: number;        // Response timeout in ms
+}
+
+/**
+ * Rate limit configuration for handling 429 responses
+ */
+export interface RateLimitConfig {
+  maxRetries?: number;           // Maximum number of retries (default: 3)
+  respectRetryAfter?: boolean;   // Respect Retry-After header (default: true)
+  maxWaitTime?: number;          // Max wait time in ms (default: 60000)
+  fallbackDelay?: number;        // Delay when no Retry-After header (default: 1000)
+  backoffFactor?: number;        // Exponential backoff factor (default: 2)
+  onRateLimit?: (attempt: number, waitTime: number) => void; // Callback for rate limit events
 }