New Context.SetLogoutFunc/Logout and SetFunc/CallFunc methods

Read HISTORY.md

_examples/routing/writing-a-middleware/share-services/main.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
+
+func main() {
+	app := newApp()
+
+	// GET: http://localhost:8080
+	app.Listen(":8080")
+}
+
+func newApp() *iris.Application {
+	app := iris.New()
+	app.Use(middleware)
+	// OR app.UseRouter(middleware)
+	// to register it everywhere,
+	// including the HTTP errors.
+
+	app.Get("/", handler)
+
+	return app
+}
+
+func middleware(ctx iris.Context) {
+	service := &helloService{
+		Greeting: "Hello",
+	}
+	setService(ctx, service)
+
+	ctx.Next()
+}
+
+func handler(ctx iris.Context) {
+	service, ok := getService(ctx)
+	if !ok {
+		ctx.StopWithStatus(iris.StatusInternalServerError)
+		return
+	}
+
+	response := service.Greet("Gophers")
+	ctx.WriteString(response)
+}
+
+/*
+| ---------------------- |
+| service implementation |
+| ---------------------- |
+*/
+
+const serviceContextKey = "app.service"
+
+func setService(ctx iris.Context, service GreetService) {
+	ctx.Values().Set(serviceContextKey, service)
+}
+
+func getService(ctx iris.Context) (GreetService, bool) {
+	v := ctx.Values().Get(serviceContextKey)
+	if v == nil {
+		return nil, false
+	}
+
+	service, ok := v.(GreetService)
+	if !ok {
+		return nil, false
+	}
+
+	return service, true
+}
+
+// A GreetService example.
+type GreetService interface {
+	Greet(name string) string
+}
+
+type helloService struct {
+	Greeting string
+}
+
+func (m *helloService) Greet(name string) string {
+	return fmt.Sprintf("%s, %s!", m.Greeting, name)
+}