main.go

package main

import "github.com/kataras/iris/v12"

func main() {
	app := iris.New()
	// register the "before" handler as the first handler which will be executed
	// on all domain's routes.
	// Or use the `UseGlobal` to register a middleware which will fire across subdomains.
	// app.Use(before)
	// register the "after" handler as the last handler which will be executed
	// after all domain's routes' handler(s).
	//
	// Or use the `DoneGlobal` to append handlers that will be fired globally.
	// app.Done(after)

	// register our routes.
	app.Get("/", indexHandler)
	app.Get("/contact", contactHandler)

	// Order of those calls doesn't matter, `UseGlobal` and `DoneGlobal`
	// are applied to existing routes and future routes.
	//
	// Remember: the `Use` and `Done` are applied to the current party's and its children,
	// so if we used the `app.Use/Done` before the routes registration
	// it would work like UseGlobal/DoneGlobal in this case, because the `app` is the root party.
	//
	// See `app.Party/PartyFunc` for more.
	app.UseGlobal(before)
	app.DoneGlobal(after)

	app.Listen(":8080")
}

func before(ctx iris.Context) {
	shareInformation := "this is a sharable information between handlers"

	requestPath := ctx.Path()
	println("Before the indexHandler or contactHandler: " + requestPath)

	ctx.Values().Set("info", shareInformation)
	ctx.Next()
}

func after(ctx iris.Context) {
	println("After the indexHandler or contactHandler")
}

func indexHandler(ctx iris.Context) {
	println("Inside indexHandler")

	// take the info from the "before" handler.
	info := ctx.Values().GetString("info")

	// write something to the client as a response.
	ctx.HTML("<h1>Response</h1>")
	ctx.HTML("<br/> Info: " + info)

	ctx.Next() // execute the "after" handler registered via `DoneGlobal`.
}

func contactHandler(ctx iris.Context) {
	println("Inside contactHandler")

	// write something to the client as a response.
	ctx.HTML("<h1>Contact</h1>")

	ctx.Next() // execute the "after" handler registered via `DoneGlobal`.
}