package udp import ( "context" "errors" "fmt" "math/rand" "net" "time" "github.com/rs/zerolog/log" "github.com/traefik/traefik/v2/pkg/config/runtime" "github.com/traefik/traefik/v2/pkg/logs" "github.com/traefik/traefik/v2/pkg/server/provider" "github.com/traefik/traefik/v2/pkg/udp" ) // Manager handles UDP services creation. type Manager struct { configs map[string]*runtime.UDPServiceInfo rand *rand.Rand // For the initial shuffling of load-balancers. } // NewManager creates a new manager. func NewManager(conf *runtime.Configuration) *Manager { return &Manager{ configs: conf.UDPServices, rand: rand.New(rand.NewSource(time.Now().UnixNano())), } } // BuildUDP creates the UDP handler for the given service name. func (m *Manager) BuildUDP(rootCtx context.Context, serviceName string) (udp.Handler, error) { serviceQualifiedName := provider.GetQualifiedName(rootCtx, serviceName) logger := log.Ctx(rootCtx).With().Str(logs.ServiceName, serviceQualifiedName).Logger() ctx := provider.AddInContext(rootCtx, serviceQualifiedName) conf, ok := m.configs[serviceQualifiedName] if !ok { return nil, fmt.Errorf("the UDP service %q does not exist", serviceQualifiedName) } if conf.LoadBalancer != nil && conf.Weighted != nil { err := errors.New("cannot create service: multi-types service not supported, consider declaring two different pieces of service instead") conf.AddError(err, true) return nil, err } switch { case conf.LoadBalancer != nil: loadBalancer := udp.NewWRRLoadBalancer() for index, server := range shuffle(conf.LoadBalancer.Servers, m.rand) { srvLogger := logger.With(). Int(logs.ServerIndex, index). Str("serverAddress", server.Address).Logger() if _, _, err := net.SplitHostPort(server.Address); err != nil { srvLogger.Error().Err(err).Msg("Failed to split host port") continue } handler, err := udp.NewProxy(server.Address) if err != nil { srvLogger.Error().Err(err).Msg("Failed to create server") continue } loadBalancer.AddServer(handler) srvLogger.Debug().Msg("Creating UDP server") } return loadBalancer, nil case conf.Weighted != nil: loadBalancer := udp.NewWRRLoadBalancer() for _, service := range shuffle(conf.Weighted.Services, m.rand) { handler, err := m.BuildUDP(ctx, service.Name) if err != nil { logger.Error().Err(err).Msg("Failed to build UDP handler") return nil, err } loadBalancer.AddWeightedServer(handler, service.Weight) } return loadBalancer, nil default: err := fmt.Errorf("the UDP service %q does not have any type defined", serviceQualifiedName) conf.AddError(err, true) return nil, err } } func shuffle[T any](values []T, r *rand.Rand) []T { shuffled := make([]T, len(values)) copy(shuffled, values) r.Shuffle(len(shuffled), func(i, j int) { shuffled[i], shuffled[j] = shuffled[j], shuffled[i] }) return shuffled }