使用属于Golang中另一个包的结构

Question

In my package main, I have:

type InfoToSend struct {
    id      string
    field1        string
    field2        string
}

and I call a method send:

err = rpc.SendValue(toSend.id, toSend.field1, toSend.field2)

I would like to refactor it to:

err = rpc.SendValue(toSend)

But in the rpc package, I cannot access the main.InfoToSend struct.

func SendValue(info InfoToSend) error {
...
}

What can do about it ?

Answer 1

Let's look at this logically. What domain does this belong to:

type InfoToSend struct {
    id            string
    field1        string
    field2        string
}

Does it belong to main, or rpc. It's info to be sent, hence its name InfoToSend. Over what is this info going to be sent? Well, it's part of a remote procedure call it seems. Common sense would place this type in the rpc package, then, surely.

The solution, then, is simple, move the type to the rpc package and export the type + fields:

type InfoToSend struct {
    ID            string
    Field1        string
    Field2        string
}

Then, from your main package, simply write this in your main package:

err := rpc.SendValue(InfoToSend{
    ID:     "id",
    Field1: "field 1 value",
    Field2: "field 2 value",
})

Job done.