traefik/pkg/server/router/udp/router.go

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package udp
import (
"context"
"errors"
"sort"
"github.com/traefik/traefik/v2/pkg/config/runtime"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/server/provider"
udpservice "github.com/traefik/traefik/v2/pkg/server/service/udp"
"github.com/traefik/traefik/v2/pkg/udp"
)
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// NewManager Creates a new Manager.
func NewManager(conf *runtime.Configuration,
serviceManager *udpservice.Manager,
) *Manager {
return &Manager{
serviceManager: serviceManager,
conf: conf,
}
}
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// Manager is a route/router manager.
type Manager struct {
serviceManager *udpservice.Manager
conf *runtime.Configuration
}
func (m *Manager) getUDPRouters(ctx context.Context, entryPoints []string) map[string]map[string]*runtime.UDPRouterInfo {
if m.conf != nil {
return m.conf.GetUDPRoutersByEntryPoints(ctx, entryPoints)
}
return make(map[string]map[string]*runtime.UDPRouterInfo)
}
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// BuildHandlers builds the handlers for the given entrypoints.
func (m *Manager) BuildHandlers(rootCtx context.Context, entryPoints []string) map[string]udp.Handler {
entryPointsRouters := m.getUDPRouters(rootCtx, entryPoints)
entryPointHandlers := make(map[string]udp.Handler)
for _, entryPointName := range entryPoints {
entryPointName := entryPointName
routers := entryPointsRouters[entryPointName]
ctx := log.With(rootCtx, log.Str(log.EntryPointName, entryPointName))
if len(routers) > 1 {
log.FromContext(ctx).Warn("Config has more than one udp router for a given entrypoint.")
}
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handlers := m.buildEntryPointHandlers(ctx, routers)
if len(handlers) > 0 {
// As UDP support only one router per entrypoint, we only take the first one.
entryPointHandlers[entryPointName] = handlers[0]
}
}
return entryPointHandlers
}
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func (m *Manager) buildEntryPointHandlers(ctx context.Context, configs map[string]*runtime.UDPRouterInfo) []udp.Handler {
var rtNames []string
for routerName := range configs {
rtNames = append(rtNames, routerName)
}
sort.Slice(rtNames, func(i, j int) bool {
return rtNames[i] > rtNames[j]
})
var handlers []udp.Handler
for _, routerName := range rtNames {
routerConfig := configs[routerName]
ctxRouter := log.With(provider.AddInContext(ctx, routerName), log.Str(log.RouterName, routerName))
logger := log.FromContext(ctxRouter)
if routerConfig.Service == "" {
err := errors.New("the service is missing on the udp router")
routerConfig.AddError(err, true)
logger.Error(err)
continue
}
handler, err := m.serviceManager.BuildUDP(ctxRouter, routerConfig.Service)
if err != nil {
routerConfig.AddError(err, true)
logger.Error(err)
continue
}
handlers = append(handlers, handler)
}
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return handlers
}