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builder.go
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builder.go
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package ratelimit
import (
_ "embed"
"fmt"
"github.com/gevinzone/basic-go/week9/webook/pkg/ratelimit"
"github.com/gin-gonic/gin"
"log"
"net/http"
)
type Builder struct {
prefix string
limiter ratelimit.Limiter
}
func NewBuilder(limiter ratelimit.Limiter) *Builder {
return &Builder{
prefix: "ip-limiter",
limiter: limiter,
}
}
func (b *Builder) Prefix(prefix string) *Builder {
b.prefix = prefix
return b
}
func (b *Builder) Build() gin.HandlerFunc {
return func(ctx *gin.Context) {
limited, err := b.limit(ctx)
if err != nil {
log.Println(err)
// 这一步很有意思,就是如果这边出错了
// 要怎么办?
ctx.AbortWithStatus(http.StatusInternalServerError)
return
}
if limited {
log.Println(err)
ctx.AbortWithStatus(http.StatusTooManyRequests)
return
}
ctx.Next()
}
}
func (b *Builder) limit(ctx *gin.Context) (bool, error) {
key := fmt.Sprintf("%s:%s", b.prefix, ctx.ClientIP())
return b.limiter.Limit(ctx, key)
}