golang + gin 异步执行操作

package main

import (
    "context"
    "fmt"
    "time"

    "github.com/gin-gonic/gin"
)

func main() {
    router := gin.Default()
    router.GET("/asy", exec)
    router.Run()
}

func exec(c *gin.Context) {
    go func() {
        message := dowork()
        fmt.Println(message)
    }()
}

func dowork() string {
    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    defer cancel()
    ticker := time.NewTicker(time.Second)
    for {
        select {
        case <-ticker.C:
            fmt.Println("ticker")
        case <-ctx.Done():
            return "finish"
        }
    }
    return ""
}