traefik/pkg/server/server_entrypoint_udp.go

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package server
import (
"context"
"fmt"
"sync"
"time"
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"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/config/static"
"github.com/traefik/traefik/v3/pkg/logs"
"github.com/traefik/traefik/v3/pkg/udp"
)
// UDPEntryPoints maps UDP entry points by their names.
type UDPEntryPoints map[string]*UDPEntryPoint
// NewUDPEntryPoints returns all the UDP entry points, keyed by name.
func NewUDPEntryPoints(cfg static.EntryPoints) (UDPEntryPoints, error) {
entryPoints := make(UDPEntryPoints)
for entryPointName, entryPoint := range cfg {
protocol, err := entryPoint.GetProtocol()
if err != nil {
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return nil, fmt.Errorf("error while building entryPoint %s: %w", entryPointName, err)
}
if protocol != "udp" {
continue
}
ep, err := NewUDPEntryPoint(entryPoint)
if err != nil {
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return nil, fmt.Errorf("error while building entryPoint %s: %w", entryPointName, err)
}
entryPoints[entryPointName] = ep
}
return entryPoints, nil
}
// Start commences the listening for all the entry points.
func (eps UDPEntryPoints) Start() {
for entryPointName, ep := range eps {
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ctx := log.With().Str(logs.EntryPointName, entryPointName).Logger().WithContext(context.Background())
go ep.Start(ctx)
}
}
// Stop makes all the entry points stop listening, and release associated resources.
func (eps UDPEntryPoints) Stop() {
var wg sync.WaitGroup
for epn, ep := range eps {
wg.Add(1)
go func(entryPointName string, entryPoint *UDPEntryPoint) {
defer wg.Done()
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logger := log.With().Str(logs.EntryPointName, entryPointName).Logger()
entryPoint.Shutdown(logger.WithContext(context.Background()))
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logger.Debug().Msg("Entry point closed")
}(epn, ep)
}
wg.Wait()
}
// Switch swaps out all the given handlers in their associated entrypoints.
func (eps UDPEntryPoints) Switch(handlers map[string]udp.Handler) {
for epName, handler := range handlers {
if ep, ok := eps[epName]; ok {
ep.Switch(handler)
continue
}
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log.Error().Str(logs.EntryPointName, epName).Msg("EntryPoint does not exist")
}
}
// UDPEntryPoint is an entry point where we listen for UDP packets.
type UDPEntryPoint struct {
listener *udp.Listener
switcher *udp.HandlerSwitcher
transportConfiguration *static.EntryPointsTransport
}
// NewUDPEntryPoint returns a UDP entry point.
func NewUDPEntryPoint(cfg *static.EntryPoint) (*UDPEntryPoint, error) {
listenConfig := newListenConfig(cfg)
listener, err := udp.Listen(listenConfig, "udp", cfg.GetAddress(), time.Duration(cfg.UDP.Timeout))
if err != nil {
return nil, err
}
return &UDPEntryPoint{listener: listener, switcher: &udp.HandlerSwitcher{}, transportConfiguration: cfg.Transport}, nil
}
// Start commences the listening for ep.
func (ep *UDPEntryPoint) Start(ctx context.Context) {
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log.Ctx(ctx).Debug().Msg("Start UDP Server")
for {
conn, err := ep.listener.Accept()
if err != nil {
// Only errClosedListener can happen that's why we return
return
}
go ep.switcher.ServeUDP(conn)
}
}
// Shutdown closes ep's listener. It eventually closes all "sessions" and
// releases associated resources, but only after it has waited for a graceTimeout,
// if any was configured.
func (ep *UDPEntryPoint) Shutdown(ctx context.Context) {
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logger := log.Ctx(ctx)
reqAcceptGraceTimeOut := time.Duration(ep.transportConfiguration.LifeCycle.RequestAcceptGraceTimeout)
if reqAcceptGraceTimeOut > 0 {
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logger.Info().Msgf("Waiting %s for incoming requests to cease", reqAcceptGraceTimeOut)
time.Sleep(reqAcceptGraceTimeOut)
}
graceTimeOut := time.Duration(ep.transportConfiguration.LifeCycle.GraceTimeOut)
if err := ep.listener.Shutdown(graceTimeOut); err != nil {
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logger.Error().Err(err).Send()
}
}
// Switch replaces ep's handler with the one given as argument.
func (ep *UDPEntryPoint) Switch(handler udp.Handler) {
ep.switcher.Switch(handler)
}