From 8e155ff0f7cf0fd98c00fc9aa5d36a956ae2afa0 Mon Sep 17 00:00:00 2001
From: drew2a <for.drew@gmail.com>
Date: Thu, 18 Aug 2022 17:17:45 +0200
Subject: [PATCH] Add null check for the `entry.tag_processor_version`

---
 .../restapi/metadata_endpoint_base.py         |  3 +-
 .../restapi/tests/test_metadata_endpoint.py   | 52 +++++++++++++------
 2 files changed, 37 insertions(+), 18 deletions(-)

diff --git a/src/tribler/core/components/metadata_store/restapi/metadata_endpoint_base.py b/src/tribler/core/components/metadata_store/restapi/metadata_endpoint_base.py
index 1e235198f46..e428432bb7f 100644
--- a/src/tribler/core/components/metadata_store/restapi/metadata_endpoint_base.py
+++ b/src/tribler/core/components/metadata_store/restapi/metadata_endpoint_base.py
@@ -76,7 +76,8 @@ def extract_tags(self, entry):
         if not is_torrent or not self.tag_rules_processor:
             return
 
-        is_auto_generated_tags_not_created = entry.tag_processor_version < self.tag_rules_processor.version
+        is_auto_generated_tags_not_created = entry.tag_processor_version is None or \
+                                             entry.tag_processor_version < self.tag_rules_processor.version
         if is_auto_generated_tags_not_created:
             generated = self.tag_rules_processor.process_torrent_title(infohash=entry.infohash, title=entry.title)
             entry.tag_processor_version = self.tag_rules_processor.version
diff --git a/src/tribler/core/components/metadata_store/restapi/tests/test_metadata_endpoint.py b/src/tribler/core/components/metadata_store/restapi/tests/test_metadata_endpoint.py
index 636270b79bd..c0da6e7b886 100644
--- a/src/tribler/core/components/metadata_store/restapi/tests/test_metadata_endpoint.py
+++ b/src/tribler/core/components/metadata_store/restapi/tests/test_metadata_endpoint.py
@@ -1,16 +1,15 @@
 import json
-from unittest.mock import MagicMock
+from unittest.mock import MagicMock, Mock
 
+import pytest
 from aiohttp.web_app import Application
-
 from ipv8.util import succeed
-
 from pony.orm import db_session
 
-import pytest
-
 from tribler.core.components.metadata_store.db.orm_bindings.channel_node import COMMITTED, TODELETE, UPDATED
+from tribler.core.components.metadata_store.db.serialization import REGULAR_TORRENT
 from tribler.core.components.metadata_store.restapi.metadata_endpoint import MetadataEndpoint, TORRENT_CHECK_TIMEOUT
+from tribler.core.components.metadata_store.restapi.metadata_endpoint_base import MetadataEndpointBase
 from tribler.core.components.restapi.rest.base_api_test import do_request
 from tribler.core.components.restapi.rest.rest_manager import error_middleware
 from tribler.core.components.torrent_checker.torrent_checker.torrent_checker import TorrentChecker
@@ -174,18 +173,19 @@ async def test_get_entry(rest_api, metadata_store):
     Test getting an entry with REST API GET request
     """
     for md_type, kwargs in (
-        (
-            metadata_store.TorrentMetadata,
-            {"title": "bla", "infohash": random_infohash(), "tracker_info": "http://sometracker.local/announce"},
-        ),
-        (
-            metadata_store.ChannelDescription,
-            {
-                "text": json.dumps(
-                    {"description_text": "*{{}bla <\\> [)]// /ee2323㋛㋛㋛  ", "channel_thumbnail": "ffffff.jpg"}
-                )
-            },
-        ),
+            (
+                    metadata_store.TorrentMetadata,
+                    {"title": "bla", "infohash": random_infohash(),
+                     "tracker_info": "http://sometracker.local/announce"},
+            ),
+            (
+                    metadata_store.ChannelDescription,
+                    {
+                        "text": json.dumps(
+                            {"description_text": "*{{}bla <\\> [)]// /ee2323㋛㋛㋛  ", "channel_thumbnail": "ffffff.jpg"}
+                        )
+                    },
+            ),
     ):
         with db_session:
             md = md_type(**kwargs)
@@ -244,3 +244,21 @@ async def test_check_torrent_query(rest_api, udp_tracker, metadata_store):
     """
     infohash = b'a' * 20
     await do_request(rest_api, f"metadata/torrents/{infohash}/health?timeout=wrong_value&refresh=1", expected_code=400)
+
+
+def test_extract_tags():
+    # Test that in the case of empty `tag_processor_version` no NPE raise
+    # see: https://github.com/Tribler/tribler/issues/6986
+    mds_endpoint = MetadataEndpointBase(
+        MagicMock(),
+        tags_db=MagicMock(),
+        tag_rules_processor=MagicMock(
+            version=1
+        )
+    )
+    entry = MagicMock(
+        get_type=Mock(return_value=REGULAR_TORRENT),
+        tag_processor_version=None
+    )
+    mds_endpoint.extract_tags(entry)
+    assert entry.tag_processor_version == 1