package server import ( "context" "os" "os/signal" "time" "github.com/traefik/traefik/v2/pkg/log" "github.com/traefik/traefik/v2/pkg/metrics" "github.com/traefik/traefik/v2/pkg/middlewares/accesslog" "github.com/traefik/traefik/v2/pkg/safe" "github.com/traefik/traefik/v2/pkg/server/middleware" ) // Server is the reverse-proxy/load-balancer engine. type Server struct { watcher *ConfigurationWatcher tcpEntryPoints TCPEntryPoints udpEntryPoints UDPEntryPoints chainBuilder *middleware.ChainBuilder accessLoggerMiddleware *accesslog.Handler signals chan os.Signal stopChan chan bool routinesPool *safe.Pool } // NewServer returns an initialized Server. func NewServer(routinesPool *safe.Pool, entryPoints TCPEntryPoints, entryPointsUDP UDPEntryPoints, watcher *ConfigurationWatcher, chainBuilder *middleware.ChainBuilder, accessLoggerMiddleware *accesslog.Handler) *Server { srv := &Server{ watcher: watcher, tcpEntryPoints: entryPoints, chainBuilder: chainBuilder, accessLoggerMiddleware: accessLoggerMiddleware, signals: make(chan os.Signal, 1), stopChan: make(chan bool, 1), routinesPool: routinesPool, udpEntryPoints: entryPointsUDP, } srv.configureSignals() return srv } // Start starts the server and Stop/Close it when context is Done. func (s *Server) Start(ctx context.Context) { go func() { <-ctx.Done() logger := log.FromContext(ctx) logger.Info("I have to go...") logger.Info("Stopping server gracefully") s.Stop() }() s.tcpEntryPoints.Start() s.udpEntryPoints.Start() s.watcher.Start() s.routinesPool.GoCtx(s.listenSignals) } // Wait blocks until the server shutdown. func (s *Server) Wait() { <-s.stopChan } // Stop stops the server. func (s *Server) Stop() { defer log.WithoutContext().Info("Server stopped") s.tcpEntryPoints.Stop() s.udpEntryPoints.Stop() s.stopChan <- true } // Close destroys the server. func (s *Server) Close() { ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) go func(ctx context.Context) { <-ctx.Done() if ctx.Err() == context.Canceled { return } else if ctx.Err() == context.DeadlineExceeded { panic("Timeout while stopping traefik, killing instance ✝") } }(ctx) stopMetricsClients() s.routinesPool.Stop() signal.Stop(s.signals) close(s.signals) close(s.stopChan) s.chainBuilder.Close() cancel() } func stopMetricsClients() { metrics.StopDatadog() metrics.StopStatsd() metrics.StopInfluxDB() }