169 lines
5.1 KiB
Go
169 lines
5.1 KiB
Go
package router
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import (
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"context"
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"errors"
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"net/http"
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"github.com/containous/alice"
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"github.com/containous/traefik/v2/pkg/config/runtime"
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"github.com/containous/traefik/v2/pkg/log"
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"github.com/containous/traefik/v2/pkg/middlewares/accesslog"
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"github.com/containous/traefik/v2/pkg/middlewares/recovery"
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"github.com/containous/traefik/v2/pkg/middlewares/tracing"
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"github.com/containous/traefik/v2/pkg/responsemodifiers"
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"github.com/containous/traefik/v2/pkg/rules"
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"github.com/containous/traefik/v2/pkg/server/internal"
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"github.com/containous/traefik/v2/pkg/server/middleware"
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"github.com/containous/traefik/v2/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(conf *runtime.Configuration,
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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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) *Manager {
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return &Manager{
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routerHandlers: make(map[string]http.Handler),
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serviceManager: serviceManager,
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middlewaresBuilder: middlewaresBuilder,
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modifierBuilder: modifierBuilder,
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conf: conf,
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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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serviceManager *service.Manager
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middlewaresBuilder *middleware.Builder
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modifierBuilder *responsemodifiers.Builder
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conf *runtime.Configuration
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}
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func (m *Manager) getHTTPRouters(ctx context.Context, entryPoints []string, tls bool) map[string]map[string]*runtime.RouterInfo {
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if m.conf != nil {
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return m.conf.GetRoutersByEntryPoints(ctx, entryPoints, tls)
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}
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return make(map[string]map[string]*runtime.RouterInfo)
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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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entryPointHandlers := make(map[string]http.Handler)
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for entryPointName, routers := range m.getHTTPRouters(rootCtx, entryPoints, tls) {
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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 (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string]*runtime.RouterInfo) (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(internal.AddProviderInContext(ctx, routerName), log.Str(log.RouterName, routerName))
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logger := log.FromContext(ctxRouter)
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handler, err := m.buildRouterHandler(ctxRouter, routerName, routerConfig)
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if err != nil {
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routerConfig.AddError(err, true)
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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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routerConfig.AddError(err, true)
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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, routerConfig *runtime.RouterInfo) (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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handler, err := m.buildHTTPHandler(ctx, routerConfig, 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 *runtime.RouterInfo, routerName string) (http.Handler, error) {
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var qualifiedNames []string
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for _, name := range router.Middlewares {
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qualifiedNames = append(qualifiedNames, internal.GetQualifiedName(ctx, name))
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}
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router.Middlewares = qualifiedNames
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rm := m.modifierBuilder.Build(ctx, qualifiedNames)
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if router.Service == "" {
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return nil, errors.New("the service is missing on the router")
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}
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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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