[#135] Add method uptime service

Signed-off-by: Dmitriy Zayakin <d.zayakin@yadro.com>

src/frostfs_testlib/storage/dataclasses/node_base.py

@@ -1,8 +1,10 @@
 from abc import abstractmethod
 from dataclasses import dataclass
+from datetime import datetime, timezone
 from typing import Optional, TypedDict, TypeVar
 
 import yaml
+from dateutil import parser
 
 from frostfs_testlib.hosting.config import ServiceConfig
 from frostfs_testlib.hosting.interfaces import Host
@@ -164,6 +166,15 @@ class NodeBase(HumanReadableABC):
     def _get_service_config(self) -> ServiceConfig:
         return self.host.get_service_config(self.name)
 
+    def get_service_uptime(self, service: str) -> datetime:
+        result = self.host.get_shell().exec(
+            f"systemctl show {service} --property ActiveEnterTimestamp | cut -d '=' -f 2"
+        )
+        start_time = parser.parse(result.stdout.strip())
+        current_time = datetime.now(tz=timezone.utc)
+        active_time = current_time - start_time
+        return active_time
+
 
 ServiceClass = TypeVar("ServiceClass", bound=NodeBase)