115 lines
3.3 KiB
Go
115 lines
3.3 KiB
Go
package tcp
|
|
|
|
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/tcp"
|
|
)
|
|
|
|
// 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.
|
|
}
|
|
|
|
// 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)
|
|
|
|
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)
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
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 {
|
|
srvLogger.Error().Err(err).Msg("Failed to create server")
|
|
continue
|
|
}
|
|
|
|
loadBalancer.AddServer(handler)
|
|
logger.Debug().Msg("Creating TCP server")
|
|
}
|
|
|
|
return loadBalancer, nil
|
|
|
|
case conf.Weighted != nil:
|
|
loadBalancer := tcp.NewWRRLoadBalancer()
|
|
|
|
for _, service := range shuffle(conf.Weighted.Services, m.rand) {
|
|
handler, err := m.BuildTCP(ctx, service.Name)
|
|
if err != nil {
|
|
logger.Error().Err(err).Msg("Failed to build TCP handler")
|
|
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
|
|
}
|