dashboard: Use gin-gonic instead of httprouter directly

dashboard/app.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"context"
+	"log"
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+type App struct {
+	router *gin.Engine
+	srv    *http.Server
+	bind   string
+}
+
+func NewApp(baseURL string, bind string) App {
+	gin.ForceConsoleColor()
+	router := gin.Default()
+
+	var baserouter *gin.RouterGroup
+	if len(baseURL) > 1 {
+		router.GET("/", func(c *gin.Context) {
+			c.Redirect(http.StatusFound, baseURL)
+		})
+
+		baserouter = router.Group(baseURL)
+	} else {
+		baserouter = router.Group("")
+	}
+	declareStaticRoutes(baserouter, baseURL)
+
+	app := App{
+		router: router,
+		bind:   bind,
+	}
+
+	return app
+}
+
+func (app *App) Start() {
+	app.srv = &http.Server{
+		Addr:    app.bind,
+		Handler: app.router,
+	}
+
+	log.Printf("Ready, listening on %s\n", app.bind)
+	if err := app.srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		log.Fatalf("listen: %s\n", err)
+	}
+}
+
+func (app *App) Stop() {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	if err := app.srv.Shutdown(ctx); err != nil {
+		log.Fatal("Server Shutdown:", err)
+	}
+}