001 Counter

Counter

我们可以用这个来监控特定的事情发生了多少次

package main

import (
    "fmt"
    "log"
    "time"

    "github.com/kataras/iris/v12"
    "github.com/rcrowley/go-metrics"
)

func main() {
    app := iris.New()

    c := metrics.NewCounter()
    metrics.GetOrRegister("requests", c)

    // 在单独的协程中打印 c  的信息
    go metrics.Log(metrics.DefaultRegistry, time.Second*3, log.Default())

    app.Get("/", func(ctx iris.Context) {
        name := ctx.URLParamDefault("name", "word")
        ctx.Text("hello-" + name + "  " + fmt.Sprintf("%d", c.Count()))
        // 每发生一次请求就给它 +1 一下
        c.Inc(1)
    })

    app.Listen("127.0.0.1:8080")
}

执行效果

webs % ./webs
Iris Version: 12.2.10

Now listening on: http://127.0.0.1:8080
Application started. Press CTRL+C to shut down.
2024/04/03 20:12:52 counter requests
2024/04/03 20:12:52   count:               0
2024/04/03 20:12:55 counter requests
2024/04/03 20:12:55   count:               1
2024/04/03 20:12:58 counter requests
2024/04/03 20:12:58   count:               2

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