实现命令行参数

Flag

flag是Go语言的一个标准包,用来处理命令行参数。

代码

//create: 2017/10/26 22:04:34 change: 2017/12/25 13:38:09 [email protected]
package main

import (
    "flag"
)

type CmdLine struct {
    Help    bool
    Host    string
    APIPath string
    Prefix  string
    Token   string
    SkipTLS bool
}

var cmdline CmdLine

func init() {
    flag.BoolVar(&cmdline.Help, "help", false, "show usage")
    flag.StringVar(&cmdline.Host, "host", "https://127.0.0.1:6443", "kubernetes api host")
    flag.StringVar(&cmdline.APIPath, "apipath", "/", "kubernetes api path")
    flag.StringVar(&cmdline.Prefix, "prefix", "", "kubernetes api prefix")
    flag.StringVar(&cmdline.Token, "token", "", "user's bearer token")
    flag.BoolVar(&cmdline.SkipTLS, "skiptls", false, "don't verify TLS certificate")
}

func main() {
    flag.Parse()
    if cmdline.Help {
        flag.Usage()
        return
    }
    println("Help:", cmdline.Help)
    println("Host:", cmdline.Host)
    println("APIPath:", cmdline.APIPath)
    println("Prefix:", cmdline.Prefix)
    println("Token:", cmdline.Token)
    println("SkipTLS:", cmdline.SkipTLS)
}

运行

查看使用方法:

$ ./k8s-haproxy -h
Usage of ./k8s-haproxy:
  -apipath string
        kubernetes api path (default "/")
  -help
        show usage
  -host string
        kubernetes api host (default "https://127.0.0.1:6443")
  -prefix string
        kubernetes api prefix
  -skiptls
        don't verify TLS certificate
  -token string
        user's bearer token

指定参数值:

$ ./k8s-haproxy -host=192.168.2.1:443 -token="this is my token"
Help: false
Host: 192.168.2.1:443
APIPath: /
Prefix:
Token: this is my token
SkipTLS: false

参考

  1. 李佶澳的博客

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