update examples

admission/example/http/main.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+)
+
+var (
+	port = flag.Int("port", 8000, "The server port")
+)
+
+type admissionRequest struct {
+	Addr string `json:"addr"`
+}
+
+type admissionResponse struct {
+	OK bool `json:"ok"`
+}
+
+func main() {
+	flag.Parse()
+	lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+	log.Printf("server listening at %v", lis.Addr())
+
+	http.HandleFunc("/admission", func(w http.ResponseWriter, r *http.Request) {
+		rb := admissionRequest{}
+		if err := json.NewDecoder(r.Body).Decode(&rb); err != nil {
+			log.Println(err)
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		resp := admissionResponse{}
+
+		host := rb.Addr
+		if v, _, _ := net.SplitHostPort(host); v != "" {
+			host = v
+		}
+		if host == "127.0.0.1" {
+			resp.OK = true
+		}
+		log.Printf("admission: %s, %v", rb.Addr, resp.OK)
+
+		json.NewEncoder(w).Encode(resp)
+	})
+
+	if err := http.Serve(lis, nil); err != nil {
+		log.Fatalf("failed to serve: %v", err)
+	}
+}