199 lines
5.7 KiB
Go
199 lines
5.7 KiB
Go
package router
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import (
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"context"
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"fmt"
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"net/http"
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"github.com/containous/alice"
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"github.com/containous/traefik/pkg/config"
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"github.com/containous/traefik/pkg/log"
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"github.com/containous/traefik/pkg/middlewares/accesslog"
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"github.com/containous/traefik/pkg/middlewares/recovery"
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"github.com/containous/traefik/pkg/middlewares/tracing"
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"github.com/containous/traefik/pkg/responsemodifiers"
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"github.com/containous/traefik/pkg/rules"
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"github.com/containous/traefik/pkg/server/internal"
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"github.com/containous/traefik/pkg/server/middleware"
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"github.com/containous/traefik/pkg/server/service"
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)
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const (
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recoveryMiddlewareName = "traefik-internal-recovery"
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)
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// NewManager Creates a new Manager
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func NewManager(routers map[string]*config.Router,
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serviceManager *service.Manager, middlewaresBuilder *middleware.Builder, modifierBuilder *responsemodifiers.Builder,
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) *Manager {
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return &Manager{
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routerHandlers: make(map[string]http.Handler),
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configs: routers,
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serviceManager: serviceManager,
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middlewaresBuilder: middlewaresBuilder,
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modifierBuilder: modifierBuilder,
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}
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}
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// Manager A route/router manager
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type Manager struct {
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routerHandlers map[string]http.Handler
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configs map[string]*config.Router
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serviceManager *service.Manager
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middlewaresBuilder *middleware.Builder
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modifierBuilder *responsemodifiers.Builder
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}
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// BuildHandlers Builds handler for all entry points
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func (m *Manager) BuildHandlers(rootCtx context.Context, entryPoints []string, tls bool) map[string]http.Handler {
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entryPointsRouters := m.filteredRouters(rootCtx, entryPoints, tls)
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entryPointHandlers := make(map[string]http.Handler)
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for entryPointName, routers := range entryPointsRouters {
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entryPointName := entryPointName
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ctx := log.With(rootCtx, log.Str(log.EntryPointName, entryPointName))
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handler, err := m.buildEntryPointHandler(ctx, routers)
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if err != nil {
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log.FromContext(ctx).Error(err)
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continue
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}
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handlerWithAccessLog, err := alice.New(func(next http.Handler) (http.Handler, error) {
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return accesslog.NewFieldHandler(next, log.EntryPointName, entryPointName, accesslog.AddOriginFields), nil
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}).Then(handler)
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if err != nil {
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log.FromContext(ctx).Error(err)
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entryPointHandlers[entryPointName] = handler
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} else {
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entryPointHandlers[entryPointName] = handlerWithAccessLog
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}
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}
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m.serviceManager.LaunchHealthCheck()
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return entryPointHandlers
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}
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func contains(entryPoints []string, entryPointName string) bool {
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for _, name := range entryPoints {
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if name == entryPointName {
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return true
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}
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}
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return false
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}
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func (m *Manager) filteredRouters(ctx context.Context, entryPoints []string, tls bool) map[string]map[string]*config.Router {
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entryPointsRouters := make(map[string]map[string]*config.Router)
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for rtName, rt := range m.configs {
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if (tls && rt.TLS == nil) || (!tls && rt.TLS != nil) {
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continue
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}
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eps := rt.EntryPoints
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if len(eps) == 0 {
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eps = entryPoints
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}
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for _, entryPointName := range eps {
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if !contains(entryPoints, entryPointName) {
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log.FromContext(log.With(ctx, log.Str(log.EntryPointName, entryPointName))).
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Errorf("entryPoint %q doesn't exist", entryPointName)
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continue
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}
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if _, ok := entryPointsRouters[entryPointName]; !ok {
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entryPointsRouters[entryPointName] = make(map[string]*config.Router)
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}
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entryPointsRouters[entryPointName][rtName] = rt
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}
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}
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return entryPointsRouters
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}
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func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string]*config.Router) (http.Handler, error) {
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router, err := rules.NewRouter()
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if err != nil {
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return nil, err
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}
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for routerName, routerConfig := range configs {
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ctxRouter := log.With(ctx, log.Str(log.RouterName, routerName))
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logger := log.FromContext(ctxRouter)
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ctxRouter = internal.AddProviderInContext(ctxRouter, routerName)
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handler, err := m.buildRouterHandler(ctxRouter, routerName)
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if err != nil {
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logger.Error(err)
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continue
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}
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err = router.AddRoute(routerConfig.Rule, routerConfig.Priority, handler)
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if err != nil {
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logger.Error(err)
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continue
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}
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}
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router.SortRoutes()
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chain := alice.New()
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chain = chain.Append(func(next http.Handler) (http.Handler, error) {
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return recovery.New(ctx, next, recoveryMiddlewareName)
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})
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return chain.Then(router)
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}
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func (m *Manager) buildRouterHandler(ctx context.Context, routerName string) (http.Handler, error) {
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if handler, ok := m.routerHandlers[routerName]; ok {
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return handler, nil
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}
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configRouter, ok := m.configs[routerName]
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if !ok {
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return nil, fmt.Errorf("no configuration for %s", routerName)
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}
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handler, err := m.buildHTTPHandler(ctx, configRouter, routerName)
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if err != nil {
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return nil, err
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}
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handlerWithAccessLog, err := alice.New(func(next http.Handler) (http.Handler, error) {
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return accesslog.NewFieldHandler(next, accesslog.RouterName, routerName, nil), nil
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}).Then(handler)
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if err != nil {
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log.FromContext(ctx).Error(err)
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m.routerHandlers[routerName] = handler
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} else {
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m.routerHandlers[routerName] = handlerWithAccessLog
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}
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return m.routerHandlers[routerName], nil
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}
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func (m *Manager) buildHTTPHandler(ctx context.Context, router *config.Router, routerName string) (http.Handler, error) {
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qualifiedNames := make([]string, len(router.Middlewares))
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for i, name := range router.Middlewares {
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qualifiedNames[i] = internal.GetQualifiedName(ctx, name)
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}
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rm := m.modifierBuilder.Build(ctx, qualifiedNames)
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sHandler, err := m.serviceManager.BuildHTTP(ctx, router.Service, rm)
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if err != nil {
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return nil, err
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}
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mHandler := m.middlewaresBuilder.BuildChain(ctx, router.Middlewares)
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tHandler := func(next http.Handler) (http.Handler, error) {
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return tracing.NewForwarder(ctx, routerName, router.Service, next), nil
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}
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return alice.New().Extend(*mHandler).Append(tHandler).Then(sHandler)
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}
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