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qps.go
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/
qps.go
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package middleware
import (
"github.com/gin-gonic/gin"
"github.com/sunist-c/genius-invokation-simulator-backend/model/kv"
"github.com/sunist-c/genius-invokation-simulator-backend/protocol/http/config"
"time"
)
// NewQPSLimiter 生成一个QPS限制器,以IP来源为基础
func NewQPSLimiter(conf config.MiddlewareConfig) func(ctx *gin.Context) {
var limiter = kv.NewSyncMap[time.Time]()
return func(ctx *gin.Context) {
if success, ip := GetIPTrace(ctx, conf); !success {
// 无法成功获取客户端IP,返回BadRequest
ctx.AbortWithStatus(400)
} else {
if limiter.Exists(ip) {
if t := limiter.Get(ip); !t.Add(time.Duration(conf.QPSLimitTime) * time.Second).Before(time.Now()) {
// 请求过快,返回PreconditionFailed
ctx.AbortWithStatus(412)
} else {
// 正常请求,更新访问时间
limiter.Set(ip, time.Now())
}
} else {
// 之前未访问过,记录访问时间
limiter.Set(ip, time.Now())
}
}
}
}