blasphem/pkg/server/server.go

package server

import (
	"context"
	"net/http"
	"os"
	"os/signal"
	"sync"
	"time"

	"github.com/labstack/echo/v4"
	"github.com/rs/zerolog/log"
	"github.com/ziflex/lecho/v3"

	"dynatron.me/x/blasphem/pkg/blas"
	"dynatron.me/x/blasphem/pkg/frontend"
	conf "dynatron.me/x/blasphem/pkg/server/config"
)

type Server struct {
	blas.Core
	*echo.Echo
	wg sync.WaitGroup
}

type RouteHaver interface {
	InstallRoutes(e *echo.Echo)
}

func (s *Server) installRoutes() {
	s.GET("/api/websocket", s.wsHandler)

	s.Component(frontend.FrontendKey).(RouteHaver).InstallRoutes(s.Echo)

	for _, c := range s.Components() {
		if rh, ok := c.(RouteHaver); ok {
			rh.InstallRoutes(s.Echo)
		}
	}
}

func New(core blas.Core) (s *Server, err error) {
	s = &Server{
		Core: core,
		Echo: echo.New(),
	}

	s.Echo.Debug = true
	s.Echo.HideBanner = true
	logger := lecho.From(log.Logger)
	s.Echo.Logger = logger

	cfg := s.Conf()

	if cfg.Server.LogRequestErrors {
		s.Echo.Use(lecho.Middleware(lecho.Config{
			Logger: logger,
		}))
	}

	s.Echo.HidePort = true

	ipext := map[conf.IPSource]echo.IPExtractor{
		conf.Legacy:        nil,
		conf.Direct:        echo.ExtractIPDirect(),
		conf.XForwardedFor: echo.ExtractIPFromXFFHeader(),
		conf.XRealIP:       echo.ExtractIPFromRealIPHeader(),
	}

	if ipext[cfg.Server.IPSource] == nil {
		log.Warn().Msg("ip_source not explicitly set")
	}

	s.Echo.IPExtractor = ipext[cfg.Server.IPSource]

	s.installRoutes()

	return s, nil
}

func (s *Server) Shutdown(ctx context.Context) error {
	err := s.ShutdownBlas(ctx)
	if err != nil {
		return err
	}

	return s.Echo.Shutdown(ctx)
}

func (s *Server) Go() error {
	s.wg.Add(1)
	go func() {
		log.Info().Str("version", s.Version()).Str("bind", s.Conf().Server.Bind).Msg("Server listening")
		err := s.Start(s.Conf().Server.Bind)
		if err != nil && err != http.ErrServerClosed {
			s.Logger.Fatal(err)
		}

		s.wg.Done()
	}()

	// Wait for interrupt signal to gracefully shutdown the server with a timeout of 10 seconds.
	// Use a buffered channel to avoid missing signals as recommended for signal.Notify
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, os.Interrupt)
	<-quit
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := s.Shutdown(ctx); err != nil {
		s.Logger.Fatal(err)
	}

	s.wg.Wait()
	s.Logger.Info("Shutdown complete")

	return nil
}