Track namespaces in options property

Now, identifies and assigns namespaces. Prior, the
backend listed items belongng to all namespaces in
all projects no matter what because they were not
being tracked. This led to longer request times
for projects that contained a fraction of total
resources. Now, rancher can filter project
resource requests; times are improved and
largely dependent on resource amount for the given
project.

store/proxy/proxy_store.go

@@ -17,6 +17,7 @@ import (
 	"github.com/rancher/norman/types/convert/merge"
 	"github.com/rancher/norman/types/values"
 	"github.com/sirupsen/logrus"
+	"golang.org/x/sync/errgroup"
 	"k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -192,11 +193,41 @@ func (s *Store) Context() types.StorageContext {
 }
 
 func (s *Store) List(apiContext *types.APIContext, schema *types.Schema, opt *types.QueryOptions) ([]map[string]interface{}, error) {
-	namespace := getNamespace(apiContext, opt)
+	var resultList unstructured.UnstructuredList
 
-	resultList, err := s.retryList(namespace, apiContext)
-	if err != nil {
-		return nil, err
+	// if there are no namespaces field in options, a single request is made
+	if opt.Namespaces == nil {
+		ns := getNamespace(apiContext, opt)
+		list, err := s.retryList(ns, apiContext)
+		if err != nil {
+			return nil, err
+		}
+		resultList = *list
+	} else {
+		var (
+			errGroup errgroup.Group
+			mux      sync.Mutex
+		)
+
+		allNS := *opt.Namespaces
+		for _, ns := range allNS {
+			nsCopy := ns
+			errGroup.Go(func() error {
+				list, err := s.retryList(nsCopy, apiContext)
+				if err != nil {
+					return err
+				}
+
+				mux.Lock()
+				resultList.Items = append(resultList.Items, list.Items...)
+				mux.Unlock()
+
+				return nil
+			})
+		}
+		if err := errGroup.Wait(); err != nil {
+			return nil, err
+		}
 	}
 
 	var result []map[string]interface{}

types/server_types.go

@@ -184,6 +184,8 @@ type QueryOptions struct {
 	Pagination *Pagination
 	Conditions []*QueryCondition
 	Options    map[string]string
+	// Set namespaces to an empty array will result in an empty response
+	Namespaces *[]string
 }
 
 type ReferenceValidator interface {