How to import go interface package in my main.go?

For clarity most of the code is removed to focus more on the question. I have a go-micro server file called main.go with the following code:

package main

import (
    "fmt"
    "strings"

    "github.com/micro/go-micro"
    "github.com/micro/go-micro/server"

    proto "mypkg/proto"
)

const serviceName = "SRV"

func main() {
    service := micro.NewService(
        micro.Name(strings.ToLower(serviceName)),
        micro.Server(
            server.NewServer(
                server.Name(strings.ToLower(serviceName))
            ),
        ),
    )

    service.Init()

    if err := proto.RegisterSRVServiceHandler(service.Server(), new(SRVService)); err != nil {
        panic(err)
    }

    if err := service.Run(); err != nil {
        panic(err)
    }
}

SRVService is in another file called srv_service.go (with the same package name) and I don't know how to import it:

package main

import (
    "context"
    proto "mypkg/proto"
)

type SRVService struct{}

func (g *SRVService) AddUser(ctx context.Context, req *proto.AddUserRequest, rsp *proto.AddUserResponse) error {
    rsp.UserId = "12312331231"
    return nil
}

How should I access SRVService in main.go?

If they're in the same folder, they're part of the same package (their package declaration must reflect that). If they are part of the same package, you don't need to import anything. You can refer to all identifiers (being exported or not) from the package.

The main package is special though. If your main package consists of multiple files, you have to list all when running or building the app, e.g.:

go run srv_service.go main.go