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// +build go1.9
package main
import (
// VisitController handles the root route.
type VisitController struct {
// the current request session,
// its initialization happens by the dependency function that we've added to the `visitApp`.
Session *sessions.Session
// A time.time which is binded from the MVC,
// order of binded fields doesn't matter.
StartTime time.Time
// Get handles
// Method: GET
// Path: http://localhost:8080
func (c *VisitController) Get() string {
// it increments a "visits" value of integer by one,
// if the entry with key 'visits' doesn't exist it will create it for you.
visits := c.Session.Increment("visits", 1)
// write the current, updated visits.
since := time.Now().Sub(c.StartTime).Seconds()
return fmt.Sprintf("%d visit(s) from my current session in %0.1f seconds of server's up-time",
visits, since)
func newApp() *iris.Application {
app := iris.New()
sess := sessions.New(sessions.Config{Cookie: "mysession_cookie_name"})
visitApp := mvc.New(app.Party("/"))
// bind the current *session.Session, which is required, to the `VisitController.Session`
// and the time.Now() to the `VisitController.StartTime`.
// if dependency is a function which accepts
// a Context and returns a single value
// then the result type of this function is resolved by the controller
// and on each request it will call the function with its Context
// and set the result(the *sessions.Session here) to the controller's field.
// If dependencies are registered without field or function's input arguments as
// consumers then those dependencies are being ignored before the server ran,
// so you can bind many dependecies and use them in different controllers.
return app
func main() {
app := newApp()
// 1. open the browser (no in private mode)
// 2. navigate to http://localhost:8080
// 3. refresh the page some times
// 4. close the browser
// 5. re-open the browser and re-play 2.
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