Co-authored-by: Mathieu Lonjaret <mathieu.lonjaret@gmail.com> Co-authored-by: Romain <rtribotte@users.noreply.github.com>
94 lines
2.8 KiB
Go
94 lines
2.8 KiB
Go
package udp
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"math/rand"
|
|
"net"
|
|
"time"
|
|
|
|
"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
|
|
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)
|
|
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 shuffle(conf.LoadBalancer.Servers, m.rand) {
|
|
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 shuffle(conf.Weighted.Services, m.rand) {
|
|
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
|
|
}
|
|
}
|
|
|
|
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
|
|
}
|