How to store and get a pointer reference in a global scope in GO -

i have got follow code:

package main   func main() {     // create  pointer referece of session of mongo db session := mongodb.createsession()      // question 1 : how store pointer reference in global scope , using anywhere of code    defer session.close()      // note suppose code call handler methods call process in package controller(the last 1 code)  } 

code of creating session of mongodb

package mongodb   func createsession() *mgo.session { session, err := mgo.dial("192.168.0.108:27017/databasename") if err != nil {     panic(err) } session.setmode(mgo.monotonic, true) return session } 

place want use pointer reference store in main

package controller   func process()  {      // question 2 : how can pointer reference store in question 1 if posible collection := mongodb.createcollection(session, "namedatabase", "colectiondata") mongodb.insertdata(collection, "ale", "45646565")  } 

the idea avoid passing reference session(my pointer reference in main function) in every 1 of functions created project.

you can't have controller package import main. not idea (and quite sure not possible). doesn't mean can't have global session variable in controller.

you can try this:

package main  import (     "controller"     "mongodb" )  func main() {     // create  pointer referece of session of mongo db     session := mongodb.createsession()     defer session.close()      controller.setdbsession(session) // or controller.init or whatever      controller.process() } 

and in controller package have:

package controller  import "mongodb"  // global session var package var session mongodb.session  // setdbsession sets mongodb session used controller package. // function must called before calling process() func setdbsession(s mongodb.session) {     session = s }  func process() {     collection := mongodb.createcollection(session, "namedatabase", "colectiondata")     mongodb.insertdata(collection, "ale", "45646565") } 

using solution, have pass session controller package once, letting main take care of creating , closing of session.