{"id":10020792,"date":"2025-05-13T14:35:37","date_gmt":"2025-05-13T06:35:37","guid":{"rendered":"https:\/\/itmax.cn\/?p=10020792"},"modified":"2025-05-13T14:35:37","modified_gmt":"2025-05-13T06:35:37","slug":"gozero%e9%99%90%e6%b5%81%e3%80%81%e7%86%94%e6%96%ad%e3%80%81%e9%99%8d%e7%ba%a7%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%ef%bc%9f%e9%9d%a2%e8%af%95%e7%9a%84%e6%97%b6%e5%80%99%e6%80%8e%e4%b9%88%e5%9b%9e","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10020792","title":{"rendered":"gozero\u9650\u6d41\u3001\u7194\u65ad\u3001\u964d\u7ea7\u5982\u4f55\u5b9e\u73b0\uff1f\u9762\u8bd5\u7684\u65f6\u5019\u600e\u4e48\u56de\u7b54\uff1f"},"content":{"rendered":"

\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u9ad8\u5e76\u53d1<\/strong>\u65e2\u662f\u4e1a\u52a1\u589e\u957f\u7684\u6807\u5fd7\uff0c\u4e5f\u662f\u7cfb\u7edf\u5d29\u6e83\u7684\u5bfc\u706b\u7d22\u3002<\/p>\n

\u4eca\u5929\u6211\u4eec\u805a\u7126Go-zero<\/code>\u8fd9\u4e2a\u6846\u67b6\uff0c\u624b\u628a\u624b\u5e26\u4f60\u638c\u63e1\u9650\u6d41\u3001\u7194\u65ad\u548c\u964d\u7ea7\uff1a<\/p>\n

\u2705 \u9650\u6d41\uff1a\u7528\u4ee4\u724c\u6876\u7b97\u6cd5\u7cbe\u51c6\u63a7\u5236\u6d41\u91cf\uff0c\u9632\u6b62\u5355\u70b9\u8fc7\u8f7d<\/strong><\/p>\n

\u2705 \u7194\u65ad\uff1a\u6784\u5efa\u201c\u65ad\u8def\u5668\u201d\u673a\u5236\uff0c\u907f\u514d\u6545\u969c\u7ea7\u8054\u6269\u6563<\/strong><\/p>\n

\u2705 \u964d\u7ea7\uff1a\u4f18\u96c5\u653e\u5f03\u975e\u6838\u5fc3\u529f\u80fd\uff0c\u5b88\u4f4f\u4e1a\u52a1\u751f\u547d\u7ebf<\/strong><\/p>\n

\u672c\u6587\u4e0d\u4ec5\u9644\u6709\u5b8c\u6574\u4ee3\u7801\u793a\u4f8b<\/strong>\uff0c\u8fd8\u62c6\u89e3\u4e86\u9ad8\u9891\u9762\u8bd5\u95ee\u9898\u53ca\u56de\u7b54\u6280\u5de7<\/strong>\uff0c\u52a9\u4f60\u4ece\u201c\u4f1a\u5199\u4ee3\u7801\u201d\u8fdb\u9636\u4e3a\u201c\u61c2\u7cfb\u7edf\u8bbe\u8ba1\u201d\u7684\u6280\u672f\u4eba\u3002<\/p>\n

\u9650\u6d41\u3001\u7194\u65ad\u793a\u4f8b\uff1a<\/h2>\n

\u9650\u6d41\u793a\u4f8b<\/h3>\n

Go-zero\u4e2d\u53ef\u4ee5\u4f7f\u7528ratelimiter<\/code>\u4e2d\u95f4\u4ef6\u6765\u5b9e\u73b0API\u6d41\u91cf\u63a7\u5236\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

\u9996\u5148\u521b\u5efa\u4e00\u4e2alimiter<\/code>\u5b9e\u4f8b\uff1a<\/p>\n

limiter := rate.NewLimiter(rate.Limit(qps), qps*3)<\/code><\/pre>\n
\u8fd9\u91ccrate.Limit(qps)<\/code>\u7528\u6765\u8bbe\u7f6e\u6bcf\u79d2\u5141\u8bb8\u7684\u8bf7\u6c42\u91cf\uff0cqps*3<\/code>\u7528\u6765\u8bbe\u7f6e\u77ac\u95f4\u6700\u5927\u5e76\u53d1\u6570\u3002<\/p>\n
\u7136\u540e\u5728\u8bf7\u6c42\u5904\u7406\u4e2d\u4f7f\u7528\u8be5limiter<\/code>\uff1a<\/p>\n
if!limiter.Allow() {\n    return http.StatusTooManyRequests, nil\n}<\/code><\/pre>\n
\u901a\u8fc7limiter.Allow()<\/code>\u5224\u65ad\u5f53\u524d\u8bf7\u6c42\u662f\u5426\u5141\u8bb8\u8bbf\u95ee\uff0c\u5982\u679c\u8d85\u8fc7\u4e86\u8bf7\u6c42\u6570\uff0c\u5219\u8fd4\u56dehttp.StatusTooManyRequests<\/code>\u9519\u8bef\u3002<\/p>\n
\u7194\u65ad\u793a\u4f8b<\/h3>\n
Go-zero\u4e2d\u6ca1\u6709\u50cfHystrix\u90a3\u6837\u6709\u975e\u5e38\u6210\u719f\u7684\u3001\u5f00\u7bb1\u5373\u7528\u7684\u7194\u65ad\u7ec4\u4ef6\uff0c\u4f46\u53ef\u4ee5\u53c2\u8003\u4e00\u4e9b\u5f00\u6e90\u7684\u7194\u65ad\u5668\u5b9e\u73b0\u6765\u8fdb\u884c\u81ea\u5b9a\u4e49\u7194\u65ad\u903b\u8f91\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6a21\u62df\u7194\u65ad\u5668\u903b\u8f91\u793a\u4f8b\uff1a<\/p>\n
package main\n\nimport (\n    "fmt"\n    "time"\n)\n\n\/\/ \u7194\u65ad\u5668\u7ed3\u6784\u4f53\ntype CircuitBreaker struct {\n    state       int32 \/\/ \u7194\u65ad\u5668\u72b6\u6001\uff0c0\u8868\u793a\u5173\u95ed\uff0c1\u8868\u793a\u6253\u5f00\uff0c2\u8868\u793a\u534a\u6253\u5f00\n    errorCount  int   \/\/ \u9519\u8bef\u8ba1\u6570\n    totalCount  int   \/\/ \u603b\u8bf7\u6c42\u8ba1\u6570\n    openTime    time.Time \/\/ \u7194\u65ad\u5668\u6253\u5f00\u65f6\u95f4\n    recoveryTime time.Duration \/\/ \u7194\u65ad\u6062\u590d\u65f6\u95f4\n    threshold   float64 \/\/ \u9519\u8bef\u7387\u9608\u503c\n}\n\n\/\/ \u521d\u59cb\u5316\u7194\u65ad\u5668\nfunc NewCircuitBreaker(recoveryTime time.Duration, threshold float64) *CircuitBreaker {\n    return &CircuitBreaker{\n       state: 0,\n       errorCount: 0,\n       totalCount: 0,\n       openTime: time.Time{},\n       recoveryTime: recoveryTime,\n       threshold: threshold,\n    }\n}\n\n\/\/ \u6267\u884c\u8bf7\u6c42\nfunc (cb *CircuitBreaker) Execute(request func() error) error {\n    if atomic.LoadInt32(&cb.state) == 1 {\n       \/\/ \u7194\u65ad\u5668\u6253\u5f00\uff0c\u76f4\u63a5\u8fd4\u56de\u9519\u8bef\n       return fmt.Errorf("service is unavailable")\n    }\n\n    err := request()\n    cb.totalCount++\n    if err!= nil {\n       cb.errorCount++\n       \/\/ \u8ba1\u7b97\u9519\u8bef\u7387\n       errorRate := float64(cb.errorCount) \/ float64(cb.totalCount)\n       if errorRate >= cb.threshold {\n          \/\/ \u8fbe\u5230\u9519\u8bef\u7387\u9608\u503c\uff0c\u6253\u5f00\u7194\u65ad\u5668\n          atomic.StoreInt32(&cb.state, 1)\n          cb.openTime = time.Now()\n       }\n       return err\n    }\n    return nil\n}\n\n\/\/ \u68c0\u67e5\u7194\u65ad\u5668\u72b6\u6001\u5e76\u5c1d\u8bd5\u6062\u590d\nfunc (cb *CircuitBreaker) CheckState() {\n    if atomic.LoadInt32(&cb.state) == 1 && time.Since(cb.openTime) >= cb.recoveryTime {\n       \/\/ \u8fdb\u5165\u534a\u6253\u5f00\u72b6\u6001\uff0c\u5c1d\u8bd5\u5141\u8bb8\u4e00\u4e2a\u8bf7\u6c42\u901a\u8fc7\n       atomic.StoreInt32(&cb.state, 2)\n    } else if atomic.LoadInt32(&cb.state) == 2 {\n       \/\/ \u534a\u6253\u5f00\u72b6\u6001\u4e0b\uff0c\u5982\u679c\u8bf7\u6c42\u6210\u529f\uff0c\u5173\u95ed\u7194\u65ad\u5668\n       atomic.StoreInt32(&cb.state, 0)\n       cb.errorCount = 0\n       cb.totalCount = 0\n    }\n}<\/code><\/pre>\n
\u4f60\u53ef\u4ee5\u8fd9\u6837\u4f7f\u7528\u5b83\uff1a<\/p>\n
func main() {\n    \/\/ \u521d\u59cb\u5316\u7194\u65ad\u5668\uff0c\u8bbe\u7f6e\u7194\u65ad\u6062\u590d\u65f6\u95f4\u4e3a5\u79d2\uff0c\u9519\u8bef\u7387\u9608\u503c\u4e3a0.5\n    cb := NewCircuitBreaker(5*time.Second, 0.5)\n\n    \/\/ \u6a21\u62df\u8bf7\u6c42\n    for i := 0; i < 10; i++ {\n       err := cb.Execute(func() error {\n          \/\/ \u8fd9\u91cc\u6a21\u62df\u670d\u52a1\u8c03\u7528\uff0c\u5047\u8bbe\u524d5\u6b21\u8c03\u7528\u5931\u8d25\n          if i < 5 {\n             return fmt.Errorf("service error")\n          }\n          return nil\n       })\n       if err!= nil {\n          fmt.Println("Request failed:", err)\n       } else {\n          fmt.Println("Request succeeded")\n       }\n       \/\/ \u68c0\u67e5\u7194\u65ad\u5668\u72b6\u6001\u5e76\u5c1d\u8bd5\u6062\u590d\n       cb.CheckState()\n    }\n}<\/code><\/pre>\n
\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cCircuitBreaker<\/code>\u7ed3\u6784\u4f53\u8868\u793a\u7194\u65ad\u5668\uff0c\u5305\u542b\u4e86\u72b6\u6001\u3001\u9519\u8bef\u8ba1\u6570\u3001\u603b\u8bf7\u6c42\u8ba1\u6570\u3001\u6253\u5f00\u65f6\u95f4\u3001\u6062\u590d\u65f6\u95f4\u548c\u9519\u8bef\u7387\u9608\u503c\u7b49\u5b57\u6bb5\u3002Execute<\/code>\u65b9\u6cd5\u7528\u4e8e\u6267\u884c\u8bf7\u6c42\uff0c\u5e76\u6839\u636e\u8bf7\u6c42\u7ed3\u679c\u66f4\u65b0\u7194\u65ad\u5668\u72b6\u6001\u3002CheckState<\/code>\u65b9\u6cd5\u7528\u4e8e\u5b9a\u671f\u68c0\u67e5\u7194\u65ad\u5668\u72b6\u6001\u5e76\u5c1d\u8bd5\u6062\u590d\u3002\u5728main<\/code>\u51fd\u6570\u4e2d\uff0c\u521d\u59cb\u5316\u4e86\u4e00\u4e2a\u7194\u65ad\u5668\uff0c\u5e76\u6a21\u62df\u4e8610\u6b21\u8bf7\u6c42\uff0c\u524d5\u6b21\u8bf7\u6c42\u6a21\u62df\u5931\u8d25\uff0c\u4ee5\u89e6\u53d1\u7194\u65ad\u5668\u7684\u6253\u5f00\u548c\u6062\u590d\u903b\u8f91\u3002<\/p>\n
\u9762\u8bd5\u53ef\u80fd\u4f1a\u95ee\u7684\u95ee\u9898\uff1a<\/h2>\n
\u2460 Go-zero\u7684\u9650\u6d41\u4e2d\u95f4\u4ef6ratelimiter\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/h3>\n
Go-zero\u7684ratelimiter<\/code>\u4e2d\u95f4\u4ef6\u662f\u57fa\u4e8e\u4ee4\u724c\u6876\u7b97\u6cd5\u6765\u5b9e\u73b0\u9650\u6d41\u7684\u3002<\/p>\n
\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd\u5176\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n
\u4ee4\u724c\u6876\u7b97\u6cd5\u57fa\u7840\u6982\u5ff5<\/h3>\n
\u4ee4\u724c\u6876\u7b97\u6cd5\u662f\u4e00\u79cd\u5e38\u7528\u7684\u6d41\u91cf\u63a7\u5236\u7b97\u6cd5\uff0c\u5176\u6838\u5fc3\u601d\u60f3\u662f\u6709\u4e00\u4e2a\u56fa\u5b9a\u5bb9\u91cf\u7684\u6876\uff0c\u7cfb\u7edf\u4f1a\u4ee5\u6052\u5b9a\u7684\u901f\u7387\u5411\u6876\u4e2d\u653e\u5165\u4ee4\u724c\u3002\u5f53\u6709\u8bf7\u6c42\u5230\u6765\u65f6\uff0c\u9700\u8981\u4ece\u6876\u4e2d\u83b7\u53d6\u4e00\u4e2a\u6216\u591a\u4e2a\u4ee4\u724c\uff0c\u5982\u679c\u6876\u4e2d\u6709\u8db3\u591f\u7684\u4ee4\u724c\uff0c\u8bf7\u6c42\u5c31\u4f1a\u88ab\u5904\u7406\uff0c\u540c\u65f6\u76f8\u5e94\u6570\u91cf\u7684\u4ee4\u724c\u4f1a\u4ece\u6876\u4e2d\u79fb\u9664\uff1b\u5982\u679c\u6876\u4e2d\u6ca1\u6709\u8db3\u591f\u7684\u4ee4\u724c\uff0c\u8bf7\u6c42\u5c31\u4f1a\u88ab\u9650\u6d41\uff08\u62d2\u7edd\u6216\u7b49\u5f85\uff09\u3002<\/p>\n
Go-zero\u4e2dratelimiter<\/code>\u7684\u5de5\u4f5c\u6d41\u7a0b<\/h3>\n
1. \u521d\u59cb\u5316<\/h4>\n
\u5728\u4f7f\u7528ratelimiter<\/code>\u65f6\uff0c\u9996\u5148\u9700\u8981\u5bf9\u5176\u8fdb\u884c\u521d\u59cb\u5316\u3002\u901a\u5e38\u4f1a\u6307\u5b9a\u4e24\u4e2a\u91cd\u8981\u7684\u53c2\u6570\uff1a<\/p>\n
    \n
  • \u6bcf\u79d2\u751f\u6210\u7684\u4ee4\u724c\u6570\uff08Rate\uff09<\/strong>\uff1a\u8868\u793a\u7cfb\u7edf\u5411\u4ee4\u724c\u6876\u4e2d\u6dfb\u52a0\u4ee4\u724c\u7684\u901f\u7387\u3002<\/li>\n
  • \u4ee4\u724c\u6876\u7684\u6700\u5927\u5bb9\u91cf\uff08Burst\uff09<\/strong>\uff1a\u5373\u4ee4\u724c\u6876\u80fd\u591f\u5bb9\u7eb3\u7684\u6700\u5927\u4ee4\u724c\u6570\u91cf\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u521d\u59cb\u5316\u793a\u4f8b\uff1a<\/p>\n
    import (\n    "github.com\/zeromicro\/go-zero\/core\/limit"\n    "golang.org\/x\/time\/rate"\n)\n\nfunc main() {\n    \/\/ \u6bcf\u79d2\u751f\u6210100\u4e2a\u4ee4\u724c\uff0c\u4ee4\u724c\u6876\u6700\u5927\u5bb9\u91cf\u4e3a300\n    limiter := limit.NewTokenLimiter(100, 300)\n}<\/code><\/pre>\n
    2. \u4ee4\u724c\u751f\u6210<\/h4>\n
    \u5728\u521d\u59cb\u5316\u5b8c\u6210\u540e\uff0c\u7cfb\u7edf\u4f1a\u6309\u7167\u8bbe\u5b9a\u7684\u901f\u7387\uff08Rate<\/code>\uff09\u5411\u4ee4\u724c\u6876\u4e2d\u6dfb\u52a0\u4ee4\u724c\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u81ea\u52a8\u8fdb\u884c\u7684\uff0c\u5e76\u4e14\u4f1a\u5728\u540e\u53f0\u6301\u7eed\u8fd0\u884c\u3002\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\uff0c\u4ee4\u724c\u6876\u4e2d\u7684\u4ee4\u724c\u6570\u91cf\u4f1a\u9010\u6e10\u589e\u52a0\uff0c\u76f4\u5230\u8fbe\u5230\u6700\u5927\u5bb9\u91cf\uff08Burst<\/code>\uff09\u3002<\/p>\n
    3. \u8bf7\u6c42\u5904\u7406<\/h4>\n
    \u5f53\u6709\u8bf7\u6c42\u5230\u6765\u65f6\uff0cratelimiter<\/code>\u4f1a\u5c1d\u8bd5\u4ece\u4ee4\u724c\u6876\u4e2d\u83b7\u53d6\u6240\u9700\u6570\u91cf\u7684\u4ee4\u724c\uff08\u901a\u5e38\u4e3a1\u4e2a\uff09\u3002\u8fd9\u4e2a\u64cd\u4f5c\u901a\u8fc7\u8c03\u7528Allow()<\/code>\u65b9\u6cd5\u6765\u5b8c\u6210\uff1a<\/p>\n
    if limiter.Allow() {\n    \/\/ \u6709\u8db3\u591f\u7684\u4ee4\u724c\uff0c\u5904\u7406\u8bf7\u6c42\n    \/\/ \u4e1a\u52a1\u903b\u8f91\u4ee3\u7801\n} else {\n    \/\/ \u6ca1\u6709\u8db3\u591f\u7684\u4ee4\u724c\uff0c\u8fdb\u884c\u9650\u6d41\u5904\u7406\n    \/\/ \u53ef\u4ee5\u8fd4\u56de\u9519\u8bef\u4fe1\u606f\u6216\u8005\u8fdb\u884c\u5176\u4ed6\u5904\u7406\n}<\/code><\/pre>\n
    Allow()<\/code>\u65b9\u6cd5\u4f1a\u6839\u636e\u5f53\u524d\u4ee4\u724c\u6876\u4e2d\u7684\u4ee4\u724c\u6570\u91cf\u6765\u5224\u65ad\u662f\u5426\u5141\u8bb8\u8bf7\u6c42\u901a\u8fc7\u3002\u5982\u679c\u6876\u4e2d\u6709\u8db3\u591f\u7684\u4ee4\u724c\uff0c\u5b83\u4f1a\u7acb\u5373\u6263\u9664\u76f8\u5e94\u6570\u91cf\u7684\u4ee4\u724c\uff0c\u5e76\u8fd4\u56detrue<\/code>\uff0c\u8868\u793a\u8bf7\u6c42\u53ef\u4ee5\u88ab\u5904\u7406\uff1b\u5982\u679c\u6876\u4e2d\u6ca1\u6709\u8db3\u591f\u7684\u4ee4\u724c\uff0c\u5b83\u4f1a\u8fd4\u56defalse<\/code>\uff0c\u8868\u793a\u8bf7\u6c42\u88ab\u9650\u6d41\u3002<\/p>\n
    4. \u52a8\u6001\u8c03\u6574<\/h4>\n
    \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u52a8\u6001\u8c03\u6574\u9650\u6d41\u7684\u901f\u7387\u548c\u5bb9\u91cf\u3002ratelimiter<\/code>\u63d0\u4f9b\u4e86\u76f8\u5e94\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u4f8b\u5982SetLimit()<\/code>\u548cSetBurst()<\/code>\u65b9\u6cd5\uff1a<\/p>\n
    \/\/ \u52a8\u6001\u8c03\u6574\u6bcf\u79d2\u751f\u6210\u7684\u4ee4\u724c\u6570\u4e3a200\nlimiter.SetLimit(rate.Limit(200))\n\/\/ \u52a8\u6001\u8c03\u6574\u4ee4\u724c\u6876\u7684\u6700\u5927\u5bb9\u91cf\u4e3a400\nlimiter.SetBurst(400)<\/code><\/pre>\n
    \u4ee3\u7801\u793a\u4f8b<\/h3>\n
    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u4f7f\u7528Go-zero\u7684ratelimiter<\/code>\u4e2d\u95f4\u4ef6\u8fdb\u884c\u9650\u6d41\u7684\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
    package main\n\nimport (\n    "fmt"\n    "github.com\/zeromicro\/go-zero\/core\/limit"\n    "golang.org\/x\/time\/rate"\n    "net\/http"\n)\n\nfunc main() {\n    \/\/ \u6bcf\u79d2\u751f\u621010\u4e2a\u4ee4\u724c\uff0c\u4ee4\u724c\u6876\u6700\u5927\u5bb9\u91cf\u4e3a30\n    limiter := limit.NewTokenLimiter(10, 30)\n\n    http.HandleFunc("\/", func(w http.ResponseWriter, r *http.Request) {\n        if limiter.Allow() {\n            fmt.Fprintf(w, "Request processed successfully")\n        } else {\n            http.Error(w, "Too many requests", http.StatusTooManyRequests)\n        }\n    })\n\n    fmt.Println("Server started on :8080")\n    http.ListenAndServe(":8080", nil)\n}<\/code><\/pre>\n
    \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u7b80\u5355\u7684HTTP\u670d\u52a1\u5668\uff0c\u5e76\u4f7f\u7528ratelimiter<\/code>\u4e2d\u95f4\u4ef6\u5bf9\u6240\u6709\u8bf7\u6c42\u8fdb\u884c\u9650\u6d41\u3002\u5f53\u8bf7\u6c42\u5230\u6765\u65f6\uff0c\u4f1a\u5148\u68c0\u67e5\u4ee4\u724c\u6876\u4e2d\u662f\u5426\u6709\u8db3\u591f\u7684\u4ee4\u724c\uff0c\u5982\u679c\u6709\u5219\u5904\u7406\u8bf7\u6c42\u5e76\u8fd4\u56de\u6210\u529f\u4fe1\u606f\uff0c\u5426\u5219\u8fd4\u56de429 Too Many Requests<\/code>\u9519\u8bef\u3002<\/p>\n
    \u901a\u8fc7\u4ee5\u4e0a\u7684\u5de5\u4f5c\u6d41\u7a0b\uff0cGo-zero\u7684ratelimiter<\/code>\u4e2d\u95f4\u4ef6\u80fd\u591f\u6709\u6548\u5730\u5bf9\u7cfb\u7edf\u7684\u6d41\u91cf\u8fdb\u884c\u63a7\u5236\uff0c\u9632\u6b62\u7cfb\u7edf\u56e0\u8fc7\u591a\u7684\u8bf7\u6c42\u800c\u5d29\u6e83\u3002<\/p>\n
    \u2461\u4f60\u5728\u9879\u76ee\u4e2d\u5177\u4f53\u600e\u4e48\u505a\u9650\u6d41\u3001\u7194\u65ad\u548c\u964d\u7ea7\u3001\u9762\u8bd5\u7684\u65f6\u5019\u600e\u4e48\u56de\u7b54\uff1f\u5177\u4f53\u7684\u4f8b\u5b50\u548c\u56de\u7b54\u6280\u5de7\u3002<\/h3>\n
    \u9650\u6d41<\/h4>\n
    \u5728\u9879\u76ee\u4e2d\uff0c\u9650\u6d41\u662f\u63a7\u5236\u8fdb\u5165\u7cfb\u7edf\u7684\u8bf7\u6c42\u901f\u7387\uff0c\u9632\u6b62\u7cfb\u7edf\u56e0\u8fc7\u8f7d\u800c\u5d29\u6e83\u3002\u4ee5\u4e0b\u4ee5Go\u8bed\u8a00\u7ed3\u5408Go-zero\u6846\u67b6\u4e3a\u4f8b\uff0c\u8bf4\u660e\u5982\u4f55\u8fdb\u884c\u9650\u6d41\u3002<\/p>\n
    \u57fa\u4e8e\u4ee4\u724c\u6876\u7b97\u6cd5\u7684\u9650\u6d41<\/h5>\n
    \u4ee4\u724c\u6876\u7b97\u6cd5\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u9650\u6d41\u7b97\u6cd5\uff0c\u7cfb\u7edf\u4ee5\u56fa\u5b9a\u901f\u7387\u5411\u6876\u4e2d\u6dfb\u52a0\u4ee4\u724c\uff0c\u8bf7\u6c42\u9700\u8981\u4ece\u6876\u4e2d\u83b7\u53d6\u4ee4\u724c\u624d\u80fd\u88ab\u5904\u7406\u3002<\/p>\n
    package main\n\nimport (\n    "github.com\/zeromicro\/go-zero\/core\/limit"\n    "golang.org\/x\/time\/rate"\n    "net\/http"\n)\n\nfunc main() {\n    \/\/ \u6bcf\u79d2\u751f\u6210100\u4e2a\u4ee4\u724c\uff0c\u4ee4\u724c\u6876\u6700\u5927\u5bb9\u91cf\u4e3a300\n    limiter := limit.NewTokenLimiter(100, 300)\n\n    http.HandleFunc("\/", func(w http.ResponseWriter, r *http.Request) {\n        if limiter.Allow() {\n            w.WriteHeader(http.StatusOK)\n            w.Write([]byte("Request processed successfully"))\n        } else {\n            w.WriteHeader(http.StatusTooManyRequests)\n            w.Write([]byte("Too many requests"))\n        }\n    })\n\n    http.ListenAndServe(":8080", nil)\n}<\/code><\/pre>\n
    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528Go-zero\u7684limit.NewTokenLimiter<\/code>\u521b\u5efa\u4e86\u4e00\u4e2a\u4ee4\u724c\u6876\u9650\u6d41\u5668\uff0c\u6bcf\u79d2\u751f\u6210100\u4e2a\u4ee4\u724c\uff0c\u6876\u7684\u6700\u5927\u5bb9\u91cf\u4e3a300\u3002\u5f53\u6709\u8bf7\u6c42\u5230\u8fbe\u65f6\uff0c\u901a\u8fc7limiter.Allow()<\/code>\u65b9\u6cd5\u5224\u65ad\u662f\u5426\u6709\u8db3\u591f\u7684\u4ee4\u724c\uff0c\u5982\u679c\u6709\u5219\u5904\u7406\u8bf7\u6c42\uff0c\u5426\u5219\u8fd4\u56de429 Too Many Requests<\/code>\u9519\u8bef\u3002<\/p>\n
    \u7194\u65ad<\/h4>\n
    \u7194\u65ad\u673a\u5236\u7528\u4e8e\u5728\u670d\u52a1\u51fa\u73b0\u6545\u969c\u6216\u54cd\u5e94\u65f6\u95f4\u8fc7\u957f\u65f6\uff0c\u6682\u65f6\u5207\u65ad\u5bf9\u8be5\u670d\u52a1\u7684\u8c03\u7528\uff0c\u907f\u514d\u6545\u969c\u6269\u6563\u3002<\/p>\n
    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u6a21\u62df\u7194\u65ad\u793a\u4f8b\u3002<\/p>\n
    package main\n\nimport (\n    "errors"\n    "fmt"\n    "sync"\n    "time"\n)\n\n\/\/ CircuitBreaker \u7194\u65ad\u5668\u7ed3\u6784\u4f53\ntype CircuitBreaker struct {\n    state       int32 \/\/ 0: \u5173\u95ed, 1: \u6253\u5f00, 2: \u534a\u5f00\n    errorCount  int\n    totalCount  int\n    openTime    time.Time\n    recoveryTime time.Duration\n    threshold   float64\n    mutex       sync.Mutex\n}\n\n\/\/ NewCircuitBreaker \u521b\u5efa\u65b0\u7684\u7194\u65ad\u5668\nfunc NewCircuitBreaker(recoveryTime time.Duration, threshold float64) *CircuitBreaker {\n    return &CircuitBreaker{\n       state: 0,\n       errorCount: 0,\n       totalCount: 0,\n       openTime: time.Time{},\n       recoveryTime: recoveryTime,\n       threshold: threshold,\n    }\n}\n\n\/\/ Execute \u6267\u884c\u8bf7\u6c42\nfunc (cb *CircuitBreaker) Execute(request func() error) error {\n    cb.mutex.Lock()\n    defer cb.mutex.Unlock()\n\n    if cb.state == 1 {\n       if time.Since(cb.openTime) > cb.recoveryTime {\n          cb.state = 2\n       } else {\n          return errors.New("circuit breaker is open")\n       }\n    }\n\n    err := request()\n    cb.totalCount++\n    if err != nil {\n       cb.errorCount++\n       errorRate := float64(cb.errorCount) \/ float64(cb.totalCount)\n       if errorRate >= cb.threshold {\n          cb.state = 1\n          cb.openTime = time.Now()\n       }\n    } else {\n       if cb.state == 2 {\n          cb.state = 0\n          cb.errorCount = 0\n          cb.totalCount = 0\n       }\n    }\n    return err\n}\n\nfunc main() {\n    cb := NewCircuitBreaker(5*time.Second, 0.5)\n\n    for i := 0; i < 10; i++ {\n       err := cb.Execute(func() error {\n          if i < 5 {\n             return errors.New("simulated error")\n          }\n          return nil\n       })\n       if err != nil {\n          fmt.Println("Request failed:", err)\n       } else {\n          fmt.Println("Request succeeded")\n       }\n    }\n}<\/code><\/pre>\n
    \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2aCircuitBreaker<\/code>\u7ed3\u6784\u4f53\uff0c\u5305\u542b\u4e86\u7194\u65ad\u5668\u7684\u72b6\u6001\u3001\u9519\u8bef\u8ba1\u6570\u3001\u603b\u8bf7\u6c42\u8ba1\u6570\u7b49\u4fe1\u606f\u3002Execute<\/code>\u65b9\u6cd5\u7528\u4e8e\u6267\u884c\u8bf7\u6c42\uff0c\u5e76\u6839\u636e\u8bf7\u6c42\u7ed3\u679c\u66f4\u65b0\u7194\u65ad\u5668\u7684\u72b6\u6001\u3002\u5f53\u9519\u8bef\u7387\u8d85\u8fc7\u9608\u503c\u65f6\uff0c\u7194\u65ad\u5668\u6253\u5f00\uff0c\u4e00\u6bb5\u65f6\u95f4\u540e\u8fdb\u5165\u534a\u5f00\u72b6\u6001\uff0c\u5c1d\u8bd5\u5141\u8bb8\u90e8\u5206\u8bf7\u6c42\u901a\u8fc7\uff0c\u5982\u679c\u8bf7\u6c42\u6210\u529f\u5219\u5173\u95ed\u7194\u65ad\u5668\u3002<\/p>\n
    \u964d\u7ea7<\/h4>\n
    \u964d\u7ea7\u662f\u6307\u5728\u7cfb\u7edf\u8d44\u6e90\u4e0d\u8db3\u6216\u670d\u52a1\u51fa\u73b0\u95ee\u9898\u65f6\uff0c\u653e\u5f03\u4e00\u4e9b\u975e\u6838\u5fc3\u4e1a\u52a1\u529f\u80fd\uff0c\u4fdd\u8bc1\u6838\u5fc3\u4e1a\u52a1\u7684\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n
    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u3002<\/p>\n
    package main\n\nimport (\n    "fmt"\n    "net\/http"\n)\n\n\/\/ \u6838\u5fc3\u4e1a\u52a1\u5904\u7406\u51fd\u6570\nfunc coreHandler(w http.ResponseWriter, r *http.Request) {\n    w.WriteHeader(http.StatusOK)\n    w.Write([]byte("Core business processed successfully"))\n}\n\n\/\/ \u975e\u6838\u5fc3\u4e1a\u52a1\u5904\u7406\u51fd\u6570\nfunc nonCoreHandler(w http.ResponseWriter, r *http.Request) {\n    w.WriteHeader(http.StatusOK)\n    w.Write([]byte("Non-core business processed successfully"))\n}\n\n\/\/ \u964d\u7ea7\u5904\u7406\u51fd\u6570\nfunc degradeHandler(w http.ResponseWriter, r *http.Request) {\n    w.WriteHeader(http.StatusOK)\n    w.Write([]byte("System is under high load, non-core business is degraded"))\n}\n\nfunc main() {\n    \/\/ \u6a21\u62df\u7cfb\u7edf\u8d1f\u8f7d\u8fc7\u9ad8\n    isHighLoad := true\n\n    http.HandleFunc("\/core", coreHandler)\n    if isHighLoad {\n       http.HandleFunc("\/non-core", degradeHandler)\n    } else {\n       http.HandleFunc("\/non-core", nonCoreHandler)\n    }\n\n    http.ListenAndServe(":8080", nil)\n}<\/code><\/pre>\n
    \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u6838\u5fc3\u4e1a\u52a1\u5904\u7406\u51fd\u6570coreHandler<\/code>\u548c\u975e\u6838\u5fc3\u4e1a\u52a1\u5904\u7406\u51fd\u6570nonCoreHandler<\/code>\u3002\u5f53\u7cfb\u7edf\u8d1f\u8f7d\u8fc7\u9ad8\u65f6\uff0c\u5c06\u975e\u6838\u5fc3\u4e1a\u52a1\u7684\u8bf7\u6c42\u8def\u7531\u5230\u964d\u7ea7\u5904\u7406\u51fd\u6570degradeHandler<\/code>\uff0c\u8fd4\u56de\u964d\u7ea7\u63d0\u793a\u4fe1\u606f\u3002<\/p>\n
    \u9762\u8bd5\u56de\u7b54\u6280\u5de7\u548c\u793a\u4f8b\u56de\u7b54<\/h3>\n
    \u56de\u7b54\u6280\u5de7<\/h4>\n