added final code for implementation of a static template cache and a …

…turn on/off feature

cmd/web/main.go

@@ -22,9 +22,15 @@ func main() {
 	}
 
 	app.TemplateCache = tc
+	app.UseCache = false
 
-	http.HandleFunc("/", handlers.Home)
-	http.HandleFunc("/about", handlers.About)
+	repo := handlers.NewRepo(&app)
+	handlers.NewHandlers(repo)
+
+	render.NewTemplates(&app)
+
+	http.HandleFunc("/", handlers.Repo.Home)
+	http.HandleFunc("/about", handlers.Repo.About)
 
 	fmt.Println(fmt.Sprintf("Starting application on port %s", portNumber))
 	_ = http.ListenAndServe(portNumber, nil)

pkg/config/config.go

@@ -5,4 +5,5 @@ import "html/template"
 // AppConfig is a struct holding die application's configuration
 type AppConfig struct {
 	TemplateCache map[string]*template.Template
+	UseCache      bool
 }

pkg/handlers/handlers.go

@@ -3,15 +3,36 @@ package handlers
 import (
 	"net/http"
 
+	"github.com/jagottsicher/myGoWebApplication/pkg/config"
 	"github.com/jagottsicher/myGoWebApplication/pkg/render"
 )
 
+// Repository is the repository type
+type Repository struct {
+	App *config.AppConfig
+}
+
+// Repo the repository used by the handlers
+var Repo *Repository
+
+// NewRepo creates a new repository
+func NewRepo(a *config.AppConfig) *Repository {
+	return &Repository{
+		App: a,
+	}
+}
+
+// NewHandlers sets the repository for the handlers
+func NewHandlers(r *Repository) {
+	Repo = r
+}
+
 // Home is the handler for the home page
-func Home(w http.ResponseWriter, r *http.Request) {
+func (m *Repository) Home(w http.ResponseWriter, r *http.Request) {
 	render.RenderTemplate(w, "home-page.tpml")
 }
 
 // About is the handler for the about page
-func About(w http.ResponseWriter, r *http.Request) {
+func (m *Repository) About(w http.ResponseWriter, r *http.Request) {
 	render.RenderTemplate(w, "about-page.tpml")
 }

pkg/render/render.go

@@ -6,23 +6,39 @@ import (
 	"log"
 	"net/http"
 	"path/filepath"
+
+	"github.com/jagottsicher/myGoWebApplication/pkg/config"
 )
 
+var app *config.AppConfig
+
+// NewTemplates sets the config for the template package
+func NewTemplates(a *config.AppConfig) {
+	app = a
+}
+
 // rendernTemplate serves as a wrapper and renders
 // a layout and a template from folder /templates to a desired writer
 func RenderTemplate(w http.ResponseWriter, tpml string) {
-	// get the template cache from the app config
+	var tc map[string]*template.Template
+
+	if app.UseCache {
+		// get the template cache from the app config
+		tc = app.TemplateCache
+	} else {
+		tc, _ = CreateTemplateCache()
+	}
 
 	// get the right template from cache
 	t, ok := tc[tpml]
 	if !ok {
-		log.Fatalln("template not in cache for some reason ", err)
+		log.Fatalln("template not in cache for some reason ", ok)
 	}
 
 	// store result in a buffer and double-check if it is a valid value
 	buf := new(bytes.Buffer)
 
-	err = t.Execute(buf, nil)
+	err := t.Execute(buf, nil)
 	if err != nil {
 		log.Println(err)
 	}

templates/about-page.tpml

@@ -5,7 +5,7 @@
         <div class="row">
             <div class="col">
                 <h1>This is the about page</h1>
-                Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sapiente ducimus possimus praesentium quaerat libero omnis rem eius quas qui iure id tenetur autem est eum, commodi ipsa sit labore nam!
+                YYY Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sapiente ducimus possimus praesentium quaerat libero omnis rem eius quas qui iure id tenetur autem est eum, commodi ipsa sit labore nam!
             </div>
         </div>
     </div>