Drop admission logic. Use a plain controller instead

clitools/pkg/controller/server.go

@@ -0,0 +1,92 @@
+package controller
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"example.com/monok8s/pkg/kube"
+
+	"github.com/emicklei/go-restful/v3"
+	"k8s.io/apiserver/pkg/server/httplog"
+)
+
+var statusesNoTracePred = httplog.StatusIsNot(
+	http.StatusOK,
+	http.StatusFound,
+	http.StatusMovedPermanently,
+	http.StatusTemporaryRedirect,
+	http.StatusBadRequest,
+	http.StatusNotFound,
+	http.StatusSwitchingProtocols,
+)
+
+type Server struct {
+	restfulCont *restful.Container
+
+	ctx       context.Context
+	clients   *kube.Clients
+	namespace string
+	nodeName  string
+	startedAt time.Time
+}
+
+type StatusResponse struct {
+	OK        bool   `json:"ok"`
+	Service   string `json:"service"`
+	Namespace string `json:"namespace,omitempty"`
+	NodeName  string `json:"nodeName,omitempty"`
+	UptimeSec int64  `json:"uptimeSec"`
+}
+
+func NewServer(ctx context.Context, clients *kube.Clients, namespace, nodeName string) *Server {
+	s := &Server{
+		ctx:       ctx,
+		clients:   clients,
+		namespace: namespace,
+		nodeName:  nodeName,
+		startedAt: time.Now(),
+	}
+	s.Initialize()
+	return s
+}
+
+func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	if s == nil {
+		http.Error(w, "server is nil", http.StatusInternalServerError)
+		return
+	}
+	if s.restfulCont == nil {
+		http.Error(w, "server not initialized", http.StatusInternalServerError)
+		return
+	}
+
+	handler := httplog.WithLogging(s.restfulCont, statusesNoTracePred)
+	handler.ServeHTTP(w, req)
+}
+
+func (s *Server) Initialize() {
+	s.restfulCont = restful.NewContainer()
+
+	ws := new(restful.WebService)
+	ws.Path("/")
+	ws.Consumes(restful.MIME_JSON)
+	ws.Produces(restful.MIME_JSON)
+
+	ws.Route(ws.GET("/status").To(s.queryStatus).
+		Doc("Return basic controller status"))
+
+	s.restfulCont.Add(ws)
+}
+
+func (s *Server) queryStatus(request *restful.Request, response *restful.Response) {
+	resp := StatusResponse{
+		OK:        true,
+		Service:   "monok8s-controller",
+		Namespace: s.namespace,
+		NodeName:  s.nodeName,
+		UptimeSec: int64(time.Since(s.startedAt).Seconds()),
+	}
+
+	_ = response.WriteHeaderAndEntity(http.StatusOK, resp)
+}