package main
​
import (
    "fmt"
    "time"
​
    "github.com/kataras/iris/v12"
    "github.com/kataras/iris/v12/mvc"
    "github.com/kataras/iris/v12/sessions"
)
​
func main() {
    app := iris.New()
​
    // Configure sessions manager as we used to.
    sess := sessions.New(sessions.Config{Cookie: "mysession_cookie_name"})
    app.Use(sess.Handler())
​
    visitApp := mvc.New(app)
    visitApp.Register(time.Now())
    visitApp.Handle(new(VisitController))
​
    app.Listen(":8080")
}

type VisitController struct {
    Session *sessions.Session
​
    StartTime time.Time
}
​
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)
}

$ go run main.go