main.go

package main

// Note how the main package is the only one importing
// packages other than the definition package.
import (
    "github.com/myproject/config"
    "github.com/myproject/database"
    "github.com/myproject/definition"
    "github.com/myproject/handler"
    "net/http"
)

func main() {
    // This approach also uses singleton instances, and
    // again it's the initiator's responsibility to make
    // sure they're initialized.
    definition.UserDBInstance = &database.SomeUserDB{}
    definition.ConfigDBInstance = &database.SomeConfigDB{}
    config.InitPermissions()
    http.HandleFunc("/", handler.UserPermissionsByID)
    http.ListenAndServe(":8080", nil)
}