wire

• google/wire
  • Compile-time DI
  • 编译时生成 DI 逻辑
    • 逻辑清晰明确
  • 不是 IoC 容器
    • 透明 - IoC 容器是一个不透明的盒子

go install github.com/google/wire/cmd/wire@latest

main.go

package main

func main() {
    e,err := InitializeEvent()
    if err != nil {
        fmt.Printf("failed to create event: %s\n", err)
        os.Exit(2)
    }
    e.Start()
}

wire.go

//+build wireinject

func InitializeEvent() Event {
    wire.Build(NewEvent, NewGreeter, NewMessage)
    return Event{}
}

wire_gen.go

// 生成的内容
func InitializeEvent() Event {
    message := NewMessage()
    greeter := NewGreeter(message)
    event := NewEvent(greeter)
    return event
}