traefik/pkg/server/service/tcp/service.go

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package tcp
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/tcp"
)
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// Manager is the TCPHandlers factory.
type Manager struct {
configs map[string]*runtime.TCPServiceInfo
rand *rand.Rand // For the initial shuffling of load-balancers.
}
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// NewManager creates a new manager.
func NewManager(conf *runtime.Configuration) *Manager {
return &Manager{
configs: conf.TCPServices,
rand: rand.New(rand.NewSource(time.Now().UnixNano())),
}
}
// BuildTCP Creates a tcp.Handler for a service configuration.
func (m *Manager) BuildTCP(rootCtx context.Context, serviceName string) (tcp.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 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 := tcp.NewWRRLoadBalancer()
if conf.LoadBalancer.TerminationDelay == nil {
defaultTerminationDelay := 100
conf.LoadBalancer.TerminationDelay = &defaultTerminationDelay
}
duration := time.Duration(*conf.LoadBalancer.TerminationDelay) * time.Millisecond
for name, server := range shuffle(conf.LoadBalancer.Servers, m.rand) {
if _, _, err := net.SplitHostPort(server.Address); err != nil {
logger.Errorf("In service %q: %v", serviceQualifiedName, err)
continue
}
handler, err := tcp.NewProxy(server.Address, duration, conf.LoadBalancer.ProxyProtocol)
if err != nil {
logger.Errorf("In service %q server %q: %v", serviceQualifiedName, server.Address, err)
continue
}
loadBalancer.AddServer(handler)
logger.WithField(log.ServerName, name).Debugf("Creating TCP server %d at %s", name, server.Address)
}
return loadBalancer, nil
case conf.Weighted != nil:
loadBalancer := tcp.NewWRRLoadBalancer()
for _, service := range shuffle(conf.Weighted.Services, m.rand) {
handler, err := m.BuildTCP(rootCtx, service.Name)
if err != nil {
logger.Errorf("In service %q: %v", serviceQualifiedName, err)
return nil, err
}
loadBalancer.AddWeightServer(handler, service.Weight)
}
return loadBalancer, nil
default:
err := fmt.Errorf("the 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
}