/
builder.go
74 lines (66 loc) · 1.9 KB
/
builder.go
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// Copyright 2023 ecodeclub
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package redislimit
import (
"fmt"
"net/http"
"github.com/gin-gonic/gin"
"github.com/redis/go-redis/v9"
"go.uber.org/atomic"
)
type RedisActiveLimit struct {
// 最大限制个数
maxActive *atomic.Int64
// 用来记录连接数的key
key string
cmd redis.Cmdable
logFn func(msg any, args ...any)
}
// NewRedisActiveLimit 全局限流
func NewRedisActiveLimit(cmd redis.Cmdable, maxActive int64, key string) *RedisActiveLimit {
return &RedisActiveLimit{
maxActive: atomic.NewInt64(maxActive),
key: key,
cmd: cmd,
logFn: func(msg any, args ...any) {
fmt.Printf("%v 详细信息: %v \n", msg, args)
},
}
}
func (a *RedisActiveLimit) SetLogFunc(fun func(msg any, args ...any)) *RedisActiveLimit {
a.logFn = fun
return a
}
func (a *RedisActiveLimit) Build() gin.HandlerFunc {
return func(ctx *gin.Context) {
currentCount, err := a.cmd.Incr(ctx, a.key).Result()
if err != nil {
// 为了安全性 直接返回异常
a.logFn("redis 加一操作", err)
ctx.AbortWithStatus(http.StatusInternalServerError)
return
}
defer func() {
if err = a.cmd.Decr(ctx, a.key).Err(); err != nil {
a.logFn("redis 减一操作", err)
}
}()
if currentCount <= a.maxActive.Load() {
ctx.Next()
} else {
a.logFn("web server ", "限流中..")
ctx.AbortWithStatus(http.StatusTooManyRequests)
}
}
}