traefik/pkg/server/router/router.go
2019-05-09 14:30:06 +02:00

197 lines
5.7 KiB
Go

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