Add migration

src/tribler/core/upgrade/knowledge_to_triblerdb/migration.py

@@ -0,0 +1,32 @@
+import logging
+import shutil
+
+from tribler.core.utilities.path_util import Path
+from tribler.core.utilities.simpledefs import STATEDIR_DB_DIR
+
+
+class MigrationKnowledgeToTriblerDB:
+    def __init__(self, state_dir: Path):
+        self.logger = logging.getLogger(self.__class__.__name__)
+        self.state_dir = state_dir
+
+        self.knowledge_db_path = self.state_dir / STATEDIR_DB_DIR / 'knowledge.db'
+        self.tribler_db_path = self.state_dir / STATEDIR_DB_DIR / 'tribler.db'
+
+        self.logger.info(f'Knowledge DB path: {self.knowledge_db_path}')
+        self.logger.info(f'Tribler DB path: {self.tribler_db_path}')
+
+    def run(self) -> bool:
+        if not self.knowledge_db_path.exists():
+            self.logger.info("Knowledge DB doesn't exist. Stop procedure.")
+            return False
+
+        try:
+            # move self.knowledge_db_path to self.tribler_db_path
+            shutil.move(str(self.knowledge_db_path), str(self.tribler_db_path))
+        except OSError as e:
+            self.logger.error(f"Failed to move the file: {e}")
+            return False
+        else:
+            self.logger.info("File moved successfully.")
+            return True

src/tribler/core/upgrade/knowledge_to_triblerdb/tests/test_knowledge_to_tribler_db_migration.py

@@ -0,0 +1,56 @@
+from unittest.mock import Mock, patch
+
+import pytest
+
+from tribler.core.upgrade.knowledge_to_triblerdb.migration import MigrationKnowledgeToTriblerDB
+from tribler.core.upgrade.tags_to_knowledge.previous_dbs.knowledge_db import KnowledgeDatabase
+from tribler.core.utilities.path_util import Path
+from tribler.core.utilities.simpledefs import STATEDIR_DB_DIR
+
+
+# pylint: disable=redefined-outer-name
+@pytest.fixture
+def migration(tmp_path: Path):
+    db_dir = tmp_path / STATEDIR_DB_DIR
+    db_dir.mkdir()
+    migration = MigrationKnowledgeToTriblerDB(tmp_path)
+    return migration
+
+
+def test_no_knowledge_db(migration: MigrationKnowledgeToTriblerDB):
+    # test that in the case of missed `knowledge.db`, migration.run() returns False
+    assert not migration.run()
+    assert not migration.knowledge_db_path.exists()
+    assert not migration.tribler_db_path.exists()
+
+
+def test_move_file(migration: MigrationKnowledgeToTriblerDB):
+    # Test that the migration moves the `knowledge.db` to `tribler.db`
+
+    # create DB file
+    KnowledgeDatabase(str(migration.knowledge_db_path)).shutdown()
+
+    assert migration.knowledge_db_path.exists()
+    assert not migration.tribler_db_path.exists()
+
+    # run migration
+    assert migration.run()
+    assert not migration.knowledge_db_path.exists()
+    assert migration.tribler_db_path.exists()
+
+
+@patch('tribler.core.upgrade.knowledge_to_triblerdb.migration.shutil.move', Mock(side_effect=FileNotFoundError))
+def test_exception(migration: MigrationKnowledgeToTriblerDB):
+    # Test that the migration doesn't move the `knowledge.db` to `tribler.db` after unsuccessful migration procedure.
+
+    # create DB file
+    KnowledgeDatabase(str(migration.knowledge_db_path)).shutdown()
+
+    assert migration.knowledge_db_path.exists()
+    assert not migration.tribler_db_path.exists()
+
+    # run migration
+    assert not migration.run()
+
+    assert migration.knowledge_db_path.exists()
+    assert not migration.tribler_db_path.exists()

src/tribler/core/upgrade/upgrade.py

@@ -19,6 +19,7 @@
 )
 from tribler.core.upgrade.config_converter import convert_config_to_tribler76
 from tribler.core.upgrade.db8_to_db10 import PonyToPonyMigration, get_db_version
+from tribler.core.upgrade.knowledge_to_triblerdb.migration import MigrationKnowledgeToTriblerDB
 from tribler.core.upgrade.tags_to_knowledge.migration import MigrationTagsToKnowledge
 from tribler.core.upgrade.tags_to_knowledge.previous_dbs.tags_db import TagDatabase
 from tribler.core.utilities.configparser import CallbackConfigParser
@@ -104,6 +105,7 @@ def run(self):
         self.upgrade_tags_to_knowledge()
         self.remove_old_logs()
         self.upgrade_pony_db_14to15()
+        self.upgrade_knowledge_to_tribler_db()
 
     def remove_old_logs(self) -> Tuple[List[Path], List[Path]]:
         self._logger.info(f'Remove old logs')
@@ -417,3 +419,8 @@ def update_status(self, status_text):
         self._logger.info(status_text)
         if self._update_status_callback:
             self._update_status_callback(status_text)
+
+    def upgrade_knowledge_to_tribler_db(self):
+        self._logger.info('Upgrade knowledge to tribler.db')
+        migration = MigrationKnowledgeToTriblerDB(self.state_dir)
+        migration.run()