perf(assets): 优化节点树

修改树策略，做读优化，写的速度降低

apps/perms/pagination.py

@@ -0,0 +1,26 @@
+from rest_framework.pagination import LimitOffsetPagination
+from rest_framework.request import Request
+
+
+class GrantedAssetLimitOffsetPagination(LimitOffsetPagination):
+    def get_count(self, queryset):
+        exclude_query_params = {
+            self.limit_query_param,
+            self.offset_query_param,
+            'key', 'all', 'show_current_asset',
+            'cache_policy', 'display', 'draw'
+        }
+        has_filter = False
+        for k, v in self._request.query_params.items():
+            if k not in exclude_query_params and v is not None:
+                has_filter = True
+                break
+        if has_filter:
+            return super().get_count(queryset)
+        node = self._view.node
+        return node.assets_amount
+
+    def paginate_queryset(self, queryset, request: Request, view=None):
+        self._request = request
+        self._view = view
+        return super().paginate_queryset(queryset, request, view=None)