Code cleanup and formatting

cmd/app/handler/handler.go

@@ -0,0 +1,57 @@
+package handler
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/kjannette/go_http_server/internal/config"
+	"github.com/labstack/echo/v4"
+	"github.com/pkg/errors"
+	"go.uber.org/zap"
+)
+
+// Handler has services that are required by the handler.
+type Handler struct {
+	logger *zap.Logger
+}
+
+// New creates a new Handler instance.
+func New(logger *zap.Logger) (*echo.Echo, Handler) {
+	h := Handler{
+		logger: logger,
+	}
+
+	e := echo.New()
+	h.setupHealthCheckRoutes(e)
+
+	return e, h
+}
+
+// RunServer runs http server and listens until context is canceled.
+func (h *Handler) RunServer(ctx context.Context, conf *config.Config, e *echo.Echo) error {
+	server := &http.Server{
+		Addr:         fmt.Sprintf(":%d", conf.API.Port),
+		ReadTimeout:  time.Duration(conf.API.ReadTimeout) * time.Second,
+		WriteTimeout: time.Duration(conf.API.WriteTimeout) * time.Second,
+		IdleTimeout:  time.Duration(conf.API.IdleTimeout) * time.Second,
+	}
+
+	go func() {
+		<-ctx.Done()
+
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), time.Duration(conf.API.ReadTimeout)*time.Second)
+		defer cancel()
+
+		if err := server.Shutdown(shutdownCtx); err != nil {
+			h.logger.Warn("graceful shutdown failed", zap.Error(err))
+		}
+	}()
+
+	if err := e.StartServer(server); err != nil && !errors.Is(err, http.ErrServerClosed) {
+		return errors.Wrap(err, "server error")
+	}
+
+	return nil
+}