traefik/pkg/server/router/router.go
2023-10-11 17:33:55 +02:00

216 lines
6.9 KiB
Go

package router
import (
"context"
"errors"
"fmt"
"net/http"
"github.com/containous/alice"
"github.com/rs/zerolog/log"
"github.com/traefik/traefik/v3/pkg/config/runtime"
"github.com/traefik/traefik/v3/pkg/logs"
"github.com/traefik/traefik/v3/pkg/metrics"
"github.com/traefik/traefik/v3/pkg/middlewares/accesslog"
metricsMiddle "github.com/traefik/traefik/v3/pkg/middlewares/metrics"
"github.com/traefik/traefik/v3/pkg/middlewares/recovery"
"github.com/traefik/traefik/v3/pkg/middlewares/tracing"
httpmuxer "github.com/traefik/traefik/v3/pkg/muxer/http"
"github.com/traefik/traefik/v3/pkg/server/middleware"
"github.com/traefik/traefik/v3/pkg/server/provider"
"github.com/traefik/traefik/v3/pkg/tls"
)
type middlewareBuilder interface {
BuildChain(ctx context.Context, names []string) *alice.Chain
}
type serviceManager interface {
BuildHTTP(rootCtx context.Context, serviceName string) (http.Handler, error)
LaunchHealthCheck(ctx context.Context)
}
// Manager A route/router manager.
type Manager struct {
routerHandlers map[string]http.Handler
serviceManager serviceManager
metricsRegistry metrics.Registry
middlewaresBuilder middlewareBuilder
chainBuilder *middleware.ChainBuilder
conf *runtime.Configuration
tlsManager *tls.Manager
}
// NewManager creates a new Manager.
func NewManager(conf *runtime.Configuration, serviceManager serviceManager, middlewaresBuilder middlewareBuilder, chainBuilder *middleware.ChainBuilder, metricsRegistry metrics.Registry, tlsManager *tls.Manager) *Manager {
return &Manager{
routerHandlers: make(map[string]http.Handler),
serviceManager: serviceManager,
metricsRegistry: metricsRegistry,
middlewaresBuilder: middlewaresBuilder,
chainBuilder: chainBuilder,
conf: conf,
tlsManager: tlsManager,
}
}
func (m *Manager) getHTTPRouters(ctx context.Context, entryPoints []string, tls bool) map[string]map[string]*runtime.RouterInfo {
if m.conf != nil {
return m.conf.GetRoutersByEntryPoints(ctx, entryPoints, tls)
}
return make(map[string]map[string]*runtime.RouterInfo)
}
// BuildHandlers Builds handler for all entry points.
func (m *Manager) BuildHandlers(rootCtx context.Context, entryPoints []string, tls bool) map[string]http.Handler {
entryPointHandlers := make(map[string]http.Handler)
for entryPointName, routers := range m.getHTTPRouters(rootCtx, entryPoints, tls) {
entryPointName := entryPointName
logger := log.Ctx(rootCtx).With().Str(logs.EntryPointName, entryPointName).Logger()
ctx := logger.WithContext(rootCtx)
handler, err := m.buildEntryPointHandler(ctx, routers)
if err != nil {
logger.Error().Err(err).Send()
continue
}
handlerWithAccessLog, err := alice.New(func(next http.Handler) (http.Handler, error) {
return accesslog.NewFieldHandler(next, logs.EntryPointName, entryPointName, accesslog.InitServiceFields), nil
}).Then(handler)
if err != nil {
logger.Error().Err(err).Send()
entryPointHandlers[entryPointName] = handler
} else {
entryPointHandlers[entryPointName] = handlerWithAccessLog
}
}
for _, entryPointName := range entryPoints {
logger := log.Ctx(rootCtx).With().Str(logs.EntryPointName, entryPointName).Logger()
ctx := logger.WithContext(rootCtx)
handler, ok := entryPointHandlers[entryPointName]
if !ok || handler == nil {
handler = BuildDefaultHTTPRouter()
}
handlerWithMiddlewares, err := m.chainBuilder.Build(ctx, entryPointName).Then(handler)
if err != nil {
logger.Error().Err(err).Send()
continue
}
entryPointHandlers[entryPointName] = handlerWithMiddlewares
}
return entryPointHandlers
}
func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string]*runtime.RouterInfo) (http.Handler, error) {
muxer, err := httpmuxer.NewMuxer()
if err != nil {
return nil, err
}
for routerName, routerConfig := range configs {
logger := log.Ctx(ctx).With().Str(logs.RouterName, routerName).Logger()
ctxRouter := logger.WithContext(provider.AddInContext(ctx, routerName))
if routerConfig.Priority == 0 {
routerConfig.Priority = httpmuxer.GetRulePriority(routerConfig.Rule)
}
handler, err := m.buildRouterHandler(ctxRouter, routerName, routerConfig)
if err != nil {
routerConfig.AddError(err, true)
logger.Error().Err(err).Send()
continue
}
if err = muxer.AddRoute(routerConfig.Rule, routerConfig.Priority, handler); err != nil {
routerConfig.AddError(err, true)
logger.Error().Err(err).Send()
continue
}
}
chain := alice.New()
chain = chain.Append(func(next http.Handler) (http.Handler, error) {
return recovery.New(ctx, next)
})
return chain.Then(muxer)
}
func (m *Manager) buildRouterHandler(ctx context.Context, routerName string, routerConfig *runtime.RouterInfo) (http.Handler, error) {
if handler, ok := m.routerHandlers[routerName]; ok {
return handler, nil
}
if routerConfig.TLS != nil {
// Don't build the router if the TLSOptions configuration is invalid.
tlsOptionsName := tls.DefaultTLSConfigName
if len(routerConfig.TLS.Options) > 0 && routerConfig.TLS.Options != tls.DefaultTLSConfigName {
tlsOptionsName = provider.GetQualifiedName(ctx, routerConfig.TLS.Options)
}
if _, err := m.tlsManager.Get(tls.DefaultTLSStoreName, tlsOptionsName); err != nil {
return nil, fmt.Errorf("building router handler: %w", err)
}
}
handler, err := m.buildHTTPHandler(ctx, routerConfig, routerName)
if err != nil {
return nil, err
}
handlerWithAccessLog, err := alice.New(func(next http.Handler) (http.Handler, error) {
return accesslog.NewFieldHandler(next, accesslog.RouterName, routerName, nil), nil
}).Then(handler)
if err != nil {
log.Ctx(ctx).Error().Err(err).Send()
m.routerHandlers[routerName] = handler
} else {
m.routerHandlers[routerName] = handlerWithAccessLog
}
return m.routerHandlers[routerName], nil
}
func (m *Manager) buildHTTPHandler(ctx context.Context, router *runtime.RouterInfo, routerName string) (http.Handler, error) {
var qualifiedNames []string
for _, name := range router.Middlewares {
qualifiedNames = append(qualifiedNames, provider.GetQualifiedName(ctx, name))
}
router.Middlewares = qualifiedNames
if router.Service == "" {
return nil, errors.New("the service is missing on the router")
}
sHandler, err := m.serviceManager.BuildHTTP(ctx, router.Service)
if err != nil {
return nil, err
}
mHandler := m.middlewaresBuilder.BuildChain(ctx, router.Middlewares)
tHandler := func(next http.Handler) (http.Handler, error) {
return tracing.NewForwarder(ctx, routerName, router.Service, next), nil
}
chain := alice.New()
if m.metricsRegistry != nil && m.metricsRegistry.IsRouterEnabled() {
chain = chain.Append(metricsMiddle.WrapRouterHandler(ctx, m.metricsRegistry, routerName, provider.GetQualifiedName(ctx, router.Service)))
}
return chain.Extend(*mHandler).Append(tHandler).Then(sHandler)
}
// BuildDefaultHTTPRouter creates a default HTTP router.
func BuildDefaultHTTPRouter() http.Handler {
return http.NotFoundHandler()
}