refactor code structure (#1738)

pkg/models/resources/v1alpha3/interface.go

@@ -1,19 +1,67 @@
 package v1alpha3
 
 import (
+	"k8s.io/apimachinery/pkg/runtime"
+	"kubesphere.io/kubesphere/pkg/api"
 	"kubesphere.io/kubesphere/pkg/apiserver/query"
+	"sort"
 )
 
 type Interface interface {
 	// Get retrieves a single object by its namespace and name
-	Get(namespace, name string) (interface{}, error)
+	Get(namespace, name string) (runtime.Object, error)
 
 	// List retrieves a collection of objects matches given query
-	List(namespace string) ([]interface{}, error)
-
-	//
-	Filter(item interface{}, filter query.Filter) bool
-
-	//
-	Compare(left interface{}, right interface{}, field query.Field) bool
+	List(namespace string, query *query.Query) (*api.ListResult, error)
 }
+
+type CompareFunc func(runtime.Object, runtime.Object, query.Field) bool
+
+type FilterFunc func(runtime.Object, query.Filter) bool
+
+func DefaultList(objects []runtime.Object, query *query.Query, compareFunc CompareFunc, filterFunc FilterFunc) *api.ListResult {
+	// selected matched ones
+	var filtered []runtime.Object
+	for _, object := range objects {
+		selected := true
+		for _, filter := range query.Filters {
+			if !filterFunc(object, filter) {
+				selected = false
+				break
+			}
+		}
+
+		if selected {
+			filtered = append(filtered, object)
+		}
+	}
+
+	start, end := query.Pagination.GetPaginationSettings(len(filtered))
+	if !query.Pagination.IsPageAvailable(len(filtered), start) {
+		return &api.ListResult{
+			Items:      nil,
+			TotalItems: 0,
+		}
+	}
+
+	// sort by sortBy field
+	sort.Slice(filtered, func(i, j int) bool {
+		if !query.Ascending {
+			return !compareFunc(filtered[i], filtered[j], query.SortBy)
+		}
+		return compareFunc(filtered[i], filtered[j], query.SortBy)
+	})
+
+	return &api.ListResult{
+		Items:      objectsToInterfaces(filtered[start:end]),
+		TotalItems: len(filtered),
+	}
+}
+
+func objectsToInterfaces(objs []runtime.Object) []interface{} {
+	var res []interface{}
+	for _, obj := range objs {
+		res = append(res, obj)
+	}
+	return res
+}