ex1-main.go

package main

import (
  "os"
  "gopkg.in/mgo.v2"
  "github.com/gorilla/mux"
  "github.com/myUser/myProject/myProject/somePackage"
)

// This could be into an Example package
type example struct {
  db      *mgo.session
  router  *mux.Router
  someVar string
}


func main () {
  e := example{}
  e.init()
  e.initRouter()
  e.initDB("someDB")
  
}

// This could be in an Example package
func (e *example) init() {
  e.someVar = os.Getenv("SOME_ENV_VAR")
}

// This could be in an Example package
func (e* example) initDB(dbName string) {
	e.db, _ = mgo.Dial(dbName)
	e.db.SetMode(mgo.Monotonic, true)
}

// This could be in an Example package
func (e *example) initRouter() {
  e.router = mux.NewRouter()

	e.router.HandleFunc("/someRoute", func(w http.ResponseWriter, r *http.Request) {
		somePackage.SomeRouteHandler(w, r, e.db, e.somevar)
	}).Methods("POST")
}

ex1-somePackage.go

package somePackage

func SomeRouteHandler(w http.ResponseWriter, r *http.Request, s *mgo.session, var string) {
  // Do something here
  s.DoSomeStuff
  a := var + " hello"
  b := anotherFunc(s, var)
  // Keep doing things
}

func anotherFunc(s *mgo.session, var string) string {
  // Do some other stuff here
  return aString
}

ex2-main.go

package main

import (
  "os"
  "gopkg.in/mgo.v2"
  "github.com/gorilla/mux"
  "github.com/myUser/myProject/myProject/somePackage"
)

// This could be into an Example package
type Example struct {
  DB      *mgo.session
  Router  *mux.Router
  SomeVar string
}


func main () {
  e := Example{}
  e.init()
  e.initRouter()
  e.initDB("someDB")
  
}

// This could be in an Example package
func (e *example) init() {
  e.SomeVar = os.Getenv("SOME_ENV_VAR")
}

// This could be in an Example package
func (e* example) initDB(dbName string) {
	e.DB, _ = mgo.Dial(dbName)
	e.DB.SetMode(mgo.Monotonic, true)
}

// This could be in an Example package
func (e *example) initRouter() {
  e.Router = mux.NewRouter()

	e.Router.HandleFunc("/someRoute", e.SomeRouteHandler).Methods("POST")
}

ex2-somePackage.go

package somePackage

func (e *example) SomeRouteHandler(w http.ResponseWriter, r *http.Request) {
  // Do something here
  e.DB.DoSomeStuff
  a := e.SomeVar + " hello"
  b := anotherFunc(e.DB, e.SomeVar)
  // Keep doing things
}

func anotherFunc(s *mgo.session, var string) string {
  // Do some other stuff here
  return aString
}