Customize bench

[guonaihong]

see #151
压测模式支持回调函数，这样可以生成每次不一样的request请求

package main

import (
    "fmt"
    "github.com/google/uuid"
    "github.com/guonaihong/gout"
    "github.com/guonaihong/gout/filter"
    "sync/atomic"
)

func main() {
    i := int32(0)

    err := filter.NewBench().
        Concurrent(30). //开30个go程
        Number(30000).  //压测30000次
        Loop(func(c *gout.Context) error {

			// 下面的代码，每次生成不一样的http body 用于压测
            uid := uuid.New()  //生成uuid
            id := atomic.AddInt32(&i, 1) //生成id, 可以理解为++i，线程安全版本

            c.POST(":1234").SetJSON(gout.H{"sid": uid.String(),
                "appkey": fmt.Sprintf("ak:%d", id),
                "text":   fmt.Sprintf("test text :%d", id)})
            return nil

        }).Do()

    if err != nil {
        fmt.Printf("err = %v\n", err)
    }
}

[codecov-io]

Codecov Report

Merging #162 into master will increase coverage by 0.64%.
The diff coverage is 90.69%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
+ Coverage   89.46%   90.11%   +0.64%     
==========================================
  Files          40       39       -1     
  Lines        1671     1689      +18     
==========================================
+ Hits         1495     1522      +27     
+ Misses        128      123       -5     
+ Partials       48       44       -4

Impacted Files	Coverage Δ
filter/retry.go	100% <ø> (+3.57%)	⬆️
filter/init.go	100% <ø> (ø)	⬆️
bench/report.go	92.9% <100%> (ø)	⬆️
core/core.go	100% <100%> (ø)	⬆️
filter/bench.go	91.48% <83.33%> (-1.62%)	⬇️
bench/task.go	87.8% <0%> (+1.21%)	⬆️
export/curl.go	100% <0%> (+28.57%)	⬆️

---

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