如果想在Gin Web服务中实现限流功能,可以使用ulule/limiter
ulule/limiter是一款支持分布式限流的框架,其可以在Redis中存储和共享限流状态,从而在分布式环境中实现一致的限流逻辑。
1.引用
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| go get github.com/ulule/limiter/v3@v3.11.2
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2.Gin限流中间件
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| package middleware
import ( "github.com/gin-gonic/gin" "github.com/redis/go-redis/v9" "github.com/ulule/limiter/v3" mgin "github.com/ulule/limiter/v3/drivers/middleware/gin" redisstore "github.com/ulule/limiter/v3/drivers/store/redis" "time" )
func RateLimitMiddleWare(rdb *redis.Client) gin.HandlerFunc { // 定义限流规则:1 请求/10秒 rate := limiter.Rate{ Period: 10 * time.Second, Limit: 1, } // 创建限流存储 store, err := redisstore.NewStoreWithOptions(rdb, limiter.StoreOptions{ Prefix: "rate_limiter", // Redis 键的前缀 }) if err != nil { panic(err) } // 创建限流实例 instance := limiter.New(store, rate) middleware := mgin.NewMiddleware(instance) return middleware }
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3.在router中使用限流中间件
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| // ratelimit rateLimitMiddleWare := middleware.RateLimitMiddleWare(redisClient) authGroup.Use(rateLimitMiddleWare)
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4.限流效果,如果限流的话,接口将会返回429的状态码
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| curl -i --request GET 'http://172.17.0.229:18080/api/v1/user/3' \ --header 'Content-Type: application/json' HTTP/1.1 429 Too Many Requests Content-Type: text/plain; charset=utf-8 X-Ratelimit-Limit: 1 X-Ratelimit-Remaining: 0 X-Ratelimit-Reset: 1734772666 Date: Sat, 21 Dec 2024 09:17:38 GMT Content-Length: 14
Limit exceeded
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在redis中会存储限流状态,如下
其中默认的key是prefix+ip,value是API的请求次数