traefik/pkg/server/service/udp/service.go

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package udp
import (
"context"
"errors"
"fmt"
"net"
"github.com/traefik/traefik/v2/pkg/config/runtime"
"github.com/traefik/traefik/v2/pkg/log"
"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
}
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// NewManager creates a new manager.
func NewManager(conf *runtime.Configuration) *Manager {
return &Manager{
configs: conf.UDPServices,
}
}
// 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)
ctx := provider.AddInContext(rootCtx, serviceQualifiedName)
ctx = log.With(ctx, log.Str(log.ServiceName, serviceName))
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
}
logger := log.FromContext(ctx)
switch {
case conf.LoadBalancer != nil:
loadBalancer := udp.NewWRRLoadBalancer()
for name, server := range conf.LoadBalancer.Servers {
if _, _, err := net.SplitHostPort(server.Address); err != nil {
logger.Errorf("In udp service %q: %v", serviceQualifiedName, err)
continue
}
handler, err := udp.NewProxy(server.Address)
if err != nil {
logger.Errorf("In udp service %q server %q: %v", serviceQualifiedName, server.Address, err)
continue
}
loadBalancer.AddServer(handler)
logger.WithField(log.ServerName, name).Debugf("Creating UDP server %d at %s", name, server.Address)
}
return loadBalancer, nil
case conf.Weighted != nil:
loadBalancer := udp.NewWRRLoadBalancer()
for _, service := range conf.Weighted.Services {
handler, err := m.BuildUDP(rootCtx, service.Name)
if err != nil {
logger.Errorf("In udp service %q: %v", serviceQualifiedName, err)
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
}
}