dragon8837
dragon8837
2014-08-25 20:44

Gosk中Flask的@before_first_request相当于什么?

已采纳

We are switching a flask app to golang for performance reasons. In flask, there is "before_first_request" which indicates a function to be run when the app gets started. This function gets run once and only once. I've been reading through the docs but can't find any equivalent in golang....does it exist? (I imagine it doesn't have to be part of the net/http package)

Our flask:

@before_first_request
def before(*args, **kwargs):
    ....
    return
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1条回答

  • dongpu5874 dongpu5874 7年前

    one way to do it is to put your function logic inside the func init() { ... } method of your module.

    Otherwise you could use sync.Once

    http://play.golang.org/p/SEJxEEDnxt

    package main
    
    import (
        "fmt"
        "sync"
    )
    
    func main() {
        var once sync.Once
        onceBody := func() {
            fmt.Println("Only once")
        }
        done := make(chan bool)
        for i := 0; i < 10; i++ {
            go func() {
                once.Do(onceBody)
                done <- true
            }()
        }
        for i := 0; i < 10; i++ {
            <-done
        }
    }
    
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