Add network topology APIs

Signed-off-by: Zhengyi Lai <zheng1@yunify.com>

pkg/kapis/network/v1alpha2/handler.go

@@ -0,0 +1,77 @@
+package v1alpha2
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"net/url"
+
+	restful "github.com/emicklei/go-restful"
+)
+
+const ScopeQueryUrl = "http://weave-scope-app.weave.svc/api/topology/services"
+
+func getNamespaceTopology(request *restful.Request, response *restful.Response) {
+	var query = url.Values{
+		"namespace": []string{request.PathParameter("namespace")},
+		"timestamp": request.QueryParameters("timestamp"),
+	}
+	var u = fmt.Sprintf("%s?%s", ScopeQueryUrl, query.Encode())
+
+	resp, err := http.Get(u)
+
+	if err != nil {
+		log.Printf("query scope faile with err %v", err)
+		_ = response.WriteError(http.StatusInternalServerError, err)
+		return
+	}
+
+	body, err := ioutil.ReadAll(resp.Body)
+	defer resp.Body.Close()
+	if err != nil {
+		log.Printf("read response error : %v", err)
+		_ = response.WriteError(http.StatusInternalServerError, err)
+		return
+	}
+
+	// need to set header for proper response
+	response.Header().Set("Content-Type", "application/json")
+	_, err = response.Write(body)
+
+	if err != nil {
+		log.Printf("write response failed %v", err)
+	}
+}
+
+func getNamespaceNodeTopology(request *restful.Request, response *restful.Response) {
+	var query = url.Values{
+		"namespace": []string{request.PathParameter("namespace")},
+		"timestamp": request.QueryParameters("timestamp"),
+	}
+	var u = fmt.Sprintf("%s/%s?%s", ScopeQueryUrl, request.PathParameter("node_id"), query.Encode())
+
+	resp, err := http.Get(u)
+
+	if err != nil {
+		log.Printf("query scope faile with err %v", err)
+		_ = response.WriteError(http.StatusInternalServerError, err)
+		return
+	}
+
+	body, err := ioutil.ReadAll(resp.Body)
+	defer resp.Body.Close()
+	if err != nil {
+		log.Printf("read response error : %v", err)
+		_ = response.WriteError(http.StatusInternalServerError, err)
+		return
+	}
+
+	// need to set header for proper response
+	response.Header().Set("Content-Type", "application/json")
+	_, err = response.Write(body)
+
+	if err != nil {
+		log.Printf("write response failed %v", err)
+	}
+}