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

116 lines
3.3 KiB
Go
Raw Normal View History

package tcp
import (
"context"
"errors"
"fmt"
"math/rand"
"net"
"time"
2022-11-21 17:36:05 +00:00
"github.com/rs/zerolog/log"
2023-02-03 14:24:05 +00:00
"github.com/traefik/traefik/v3/pkg/config/runtime"
"github.com/traefik/traefik/v3/pkg/logs"
"github.com/traefik/traefik/v3/pkg/server/provider"
"github.com/traefik/traefik/v3/pkg/tcp"
)
2020-05-11 10:06:07 +00:00
// Manager is the TCPHandlers factory.
type Manager struct {
dialerManager *tcp.DialerManager
configs map[string]*runtime.TCPServiceInfo
rand *rand.Rand // For the initial shuffling of load-balancers.
}
2020-05-11 10:06:07 +00:00
// NewManager creates a new manager.
func NewManager(conf *runtime.Configuration, dialerManager *tcp.DialerManager) *Manager {
return &Manager{
dialerManager: dialerManager,
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)
2022-11-21 17:36:05 +00:00
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 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 := tcp.NewWRRLoadBalancer()
if len(conf.LoadBalancer.ServersTransport) > 0 {
conf.LoadBalancer.ServersTransport = provider.GetQualifiedName(ctx, conf.LoadBalancer.ServersTransport)
}
2022-11-21 17:36:05 +00:00
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 {
2022-11-21 17:36:05 +00:00
srvLogger.Error().Err(err).Msg("Failed to split host port")
continue
}
dialer, err := m.dialerManager.Get(conf.LoadBalancer.ServersTransport, server.TLS)
if err != nil {
return nil, err
}
handler, err := tcp.NewProxy(server.Address, conf.LoadBalancer.ProxyProtocol, dialer)
if err != nil {
2022-11-21 17:36:05 +00:00
srvLogger.Error().Err(err).Msg("Failed to create server")
continue
}
loadBalancer.AddServer(handler)
2022-11-21 17:36:05 +00:00
logger.Debug().Msg("Creating TCP server")
}
2022-11-21 17:36:05 +00:00
return loadBalancer, nil
2022-11-21 17:36:05 +00:00
case conf.Weighted != nil:
loadBalancer := tcp.NewWRRLoadBalancer()
for _, service := range shuffle(conf.Weighted.Services, m.rand) {
2022-11-21 17:36:05 +00:00
handler, err := m.BuildTCP(ctx, service.Name)
if err != nil {
2022-11-21 17:36:05 +00:00
logger.Error().Err(err).Msg("Failed to build TCP handler")
return nil, err
}
2022-11-21 17:36:05 +00:00
loadBalancer.AddWeightServer(handler, service.Weight)
}
2022-11-21 17:36:05 +00:00
return loadBalancer, nil
2022-11-21 17:36:05 +00:00
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
}