huge refactoring

app/app.go

@@ -0,0 +1,59 @@
+package app
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/gulien/gotenberg/app/config"
+	"github.com/gulien/gotenberg/app/handlers"
+	"github.com/gulien/gotenberg/app/handlers/converter/process"
+	"github.com/gulien/gotenberg/app/logger"
+
+	"github.com/gorilla/mux"
+)
+
+type App struct {
+	version string
+	config  *config.AppConfig
+	Server  *http.Server
+}
+
+func NewApp(version string) (*App, error) {
+	c, err := config.NewAppConfig()
+	if err != nil {
+		logger.Error(err)
+		return nil, &appConfigError{}
+	}
+
+	a := &App{}
+	a.version = version
+	a.config = c
+
+	// defines our application logging.
+	logger.SetLevel(a.config.Logs.Level)
+	logger.SetFormatter(a.config.Logs.Formatter)
+
+	// defines our application router.
+	r := mux.NewRouter()
+	r.Handle("/", handlers.GetHandlersChain())
+
+	a.Server = &http.Server{
+		Addr: fmt.Sprintf(":%s", a.config.Port),
+		// good practice to set timeouts to avoid Slowloris attacks.
+		WriteTimeout: time.Second * 15,
+		ReadTimeout:  time.Second * 15,
+		IdleTimeout:  time.Second * 60,
+		Handler:      r,
+	}
+
+	return a, nil
+}
+
+func (a *App) Run() error {
+	process.Load(a.config.CommandsConfig)
+	logger.Infof("Gotenberg %s", a.version)
+	logger.Infof("Application is starting on %s", a.Server.Addr)
+
+	return a.Server.ListenAndServe()
+}