如何处理多个配置

Question

Is there a good way to reuse the code to read different configurations?

btw: I used config lib is configor

the code maybe like,

type Config1 struct {
    //some config items
}
type Config2 struct {
    //some config items
}

func LoadConfig1() Config1 {
    var c Config1
    configor.Load(&c, "MY/CONFIG1/PATH")
    return c
}

func LoadConfig1() Config2 {
    var c Config2
    configor.Load(&c, "MY/CONFIG2/PATH")
    return c
}

1. Can I reuse LoadConfig with Config1/Config2?
2. Can I design an object like singleton to create Config1/Config2 just once.

Answer 1

Use the sync package to make sure config is only loaded once.

Example:

import "sync"

var (
    c Config1
    once sync.Once
    loadFunc = func() {
        configor.Load(&c, "MY/CONFIG1/PATH")
    }
)

func LoadConfig() Config1 {
    once.Do(loadFunc)
    return c
}

Any subsequent calls to LoadConfig will be ignored. For example:

func main() {
    c1 := LoadConfig() // Loaded, returns the value
    c2 := LoadConfig() // Not loaded, returns the first loaded value
    c3 := LoadConfig() // Not loaded, returns the first loaded value
}