traefik/pkg/server/service/internalhandler.go

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package service
import (
"context"
"errors"
"fmt"
"net/http"
"strings"
"github.com/containous/traefik/v2/pkg/config/runtime"
)
type serviceManager interface {
BuildHTTP(rootCtx context.Context, serviceName string, responseModifier func(*http.Response) error) (http.Handler, error)
LaunchHealthCheck()
}
// InternalHandlers is the internal HTTP handlers builder.
type InternalHandlers struct {
api http.Handler
dashboard http.Handler
rest http.Handler
prometheus http.Handler
ping http.Handler
serviceManager
}
// NewInternalHandlers creates a new InternalHandlers.
func NewInternalHandlers(api func(configuration *runtime.Configuration) http.Handler, configuration *runtime.Configuration, rest http.Handler, metricsHandler http.Handler, pingHandler http.Handler, dashboard http.Handler, next serviceManager) *InternalHandlers {
var apiHandler http.Handler
if api != nil {
apiHandler = api(configuration)
}
return &InternalHandlers{
api: apiHandler,
dashboard: dashboard,
rest: rest,
prometheus: metricsHandler,
ping: pingHandler,
serviceManager: next,
}
}
// BuildHTTP builds an HTTP handler.
func (m *InternalHandlers) BuildHTTP(rootCtx context.Context, serviceName string, responseModifier func(*http.Response) error) (http.Handler, error) {
if strings.HasSuffix(serviceName, "@internal") {
return m.get(serviceName)
}
return m.serviceManager.BuildHTTP(rootCtx, serviceName, responseModifier)
}
func (m *InternalHandlers) get(serviceName string) (http.Handler, error) {
switch serviceName {
case "noop@internal":
return http.HandlerFunc(func(rw http.ResponseWriter, _ *http.Request) {
rw.WriteHeader(http.StatusTeapot)
}), nil
case "api@internal":
if m.api == nil {
return nil, errors.New("api is not enabled")
}
return m.api, nil
case "dashboard@internal":
if m.dashboard == nil {
return nil, errors.New("dashboard is not enabled")
}
return m.dashboard, nil
case "rest@internal":
if m.rest == nil {
return nil, errors.New("rest is not enabled")
}
return m.rest, nil
case "ping@internal":
if m.ping == nil {
return nil, errors.New("ping is not enabled")
}
return m.ping, nil
case "prometheus@internal":
if m.prometheus == nil {
return nil, errors.New("prometheus is not enabled")
}
return m.prometheus, nil
default:
return nil, fmt.Errorf("unknown internal service %s", serviceName)
}
}