59 lines
1.1 KiB
Go
59 lines
1.1 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"os"
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)
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// PortValue 自定义端口类型，实现flag.Value接口
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type PortValue int
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func (p *PortValue) Set(s string) error {
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var port int
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_, err := fmt.Sscanf(s, "%d", &port)
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if err != nil || port < 1 || port > 65535 {
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return fmt.Errorf("非法端口，必须为1-65535整数")
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}
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*p = PortValue(port)
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return nil
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}
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func (p *PortValue) String() string {
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return fmt.Sprintf("%d", *p)
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}
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// EnvValue 枚举环境校验类型
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type EnvValue string
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func (e *EnvValue) Set(s string) error {
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if s != "dev" && s != "prod" {
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return fmt.Errorf("仅支持 dev/prod 环境")
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}
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*e = EnvValue(s)
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return nil
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}
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func (e *EnvValue) String() string {
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return string(*e)
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}
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func main() {
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var port PortValue
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var env EnvValue
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flag.Var(&port, "port", "服务端口 1-65535")
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flag.Var(&env, "env", "运行环境 dev/prod")
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config := flag.String("config", "", "配置文件路径(必填)")
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flag.Parse()
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// 后置非空校验
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if *config == "" {
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fmt.Println("错误：config 参数不能为空")
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flag.Usage()
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os.Exit(1)
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}
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fmt.Printf("环境：%s，端口：%d，配置：%s\n", env, port, *config)
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}
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