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idempotency-handling

Implement idempotency keys and handling to ensure operations can be safely retried without duplicate effects. Use when building payment systems, APIs with retries, or distributed transactions.

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集成工具StripeRedis
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包含的文件(8)

  • SKILL.md3.4 KB
  • references/database-based-idempotency.md2.7 KB
  • references/express-idempotency-middleware.md4.3 KB
  • references/message-queue-idempotency.md2.6 KB
  • references/stripe-style-idempotency.md5.1 KB
  • references/upstream.md1.3 KB
  • scripts/validate-api.sh438 B
  • templates/api-scaffold.yaml467 B

SKILL.md(原文)

安装前可以查看交给 AI 代理的指令内容。

This repository (Asymmetric-al/core)

Subordinate to docs/ai/rules/backend.md and docs/guides/architecture/data-access-boundary.md. Pair with Stripe/payment work using ecosystem skills under .agents/skills/ when installed.

Repo touchpoints:

  • Donor API idempotency header validation: packages/api/src/donate/idempotency.ts (idempotency-key / x-idempotency-key).
  • Prefer existing monorepo patterns (Next.js route handlers, Supabase, Stripe) over copying generic Express/Redis examples from this skill verbatim.

Refresh: references/upstream.md.

Idempotency Handling

Table of Contents

Overview

Implement idempotency to ensure operations produce the same result regardless of how many times they're executed.

When to Use

  • Payment processing
  • API endpoints with retries
  • Webhooks and callbacks
  • Message queue consumers
  • Distributed transactions
  • Bank transfers
  • Order creation
  • Email sending
  • Resource creation

Quick Start

Minimal working example:

import express from "express";
import Redis from "ioredis";
import crypto from "crypto";

interface IdempotentRequest {
  key: string;
  status: "processing" | "completed" | "failed";
  response?: any;
  error?: string;
  createdAt: number;
  completedAt?: number;
}

class IdempotencyService {
  private redis: Redis;
  private ttl = 86400; // 24 hours

  constructor(redisUrl: string) {
    this.redis = new Redis(redisUrl);
  }

  async getRequest(key: string): Promise<IdempotentRequest | null> {
    const data = await this.redis.get(`idempotency:${key}`);
    return data ? JSON.parse(data) : null;
  }
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

GuideContents
Express Idempotency MiddlewareExpress Idempotency Middleware
Database-Based IdempotencyDatabase-Based Idempotency
Stripe-Style IdempotencyStripe-Style Idempotency
Message Queue IdempotencyMessage Queue Idempotency

Best Practices

✅ DO

  • Require idempotency keys for mutations
  • Store request and response together
  • Set appropriate TTL for idempotency records
  • Validate request body matches stored request
  • Handle concurrent requests gracefully
  • Return same response for duplicate requests
  • Clean up old idempotency records
  • Use database constraints for atomicity

❌ DON'T

  • Apply idempotency to GET requests
  • Store idempotency data forever
  • Skip validation of request body
  • Use non-unique idempotency keys
  • Process same request concurrently
  • Change response for duplicate requests

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