perf: 优化 Session 支持 duration 字段

apps/terminal/models/session/session.py

@@ -2,6 +2,7 @@ from __future__ import unicode_literals
 
 import os
 import uuid
+from datetime import timedelta
 
 from django.conf import settings
 from django.core.cache import cache
@@ -233,6 +234,14 @@ class Session(OrgModelMixin):
         target_ip = instance.get_target_ip() if instance else ''
         return target_ip
 
+    @property
+    def duration(self):
+        date_end = self.date_end or timezone.now()
+        delta = date_end - self.date_start
+        # 去掉毫秒的显示
+        delta = timedelta(seconds=int(delta.total_seconds()))
+        return str(delta)
+
     @classmethod
     def generate_fake(cls, count=100, is_finished=True):
         import random

apps/terminal/serializers/session.py

@@ -37,13 +37,14 @@ class SessionSerializer(BulkOrgResourceModelSerializer):
             "user", "asset", "user_id", "asset_id", 'account', 'account_id',
             "protocol", 'type', "login_from", "remote_addr",
             "is_success", "is_finished", "has_replay", "has_command",
-            "date_start", "date_end", "comment", "terminal_display", "is_locked",
+            "date_start", "date_end", "duration", "comment", "terminal_display", "is_locked",
             'command_amount', 'error_reason'
         ]
         fields_fk = ["terminal", ]
         fields_custom = ["can_replay", "can_join", "can_terminate"]
         fields = fields_small + fields_fk + fields_custom
         extra_kwargs = {
+            "Duration": {'label': _('Duration')},
             "protocol": {'label': _('Protocol')},
             'user_id': {'label': _('User ID')},
             'asset_id': {'label': _('Asset ID')},