split code into submodules

src/nominatim_db/clicmd/freeze.py

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2024 by the Nominatim developer community.
+# For a full list of authors see the git log.
+"""
+Implementation of the 'freeze' subcommand.
+"""
+import argparse
+
+from nominatim_core.db.connection import connect
+from .args import NominatimArgs
+
+# Do not repeat documentation of subcommand classes.
+# pylint: disable=C0111
+# Using non-top-level imports to avoid eventually unused imports.
+# pylint: disable=E0012,C0415
+
+class SetupFreeze:
+    """\
+    Make database read-only.
+
+    About half of data in the Nominatim database is kept only to be able to
+    keep the data up-to-date with new changes made in OpenStreetMap. This
+    command drops all this data and only keeps the part needed for geocoding
+    itself.
+
+    This command has the same effect as the `--no-updates` option for imports.
+    """
+
+    def add_args(self, parser: argparse.ArgumentParser) -> None:
+        pass # No options
+
+
+    def run(self, args: NominatimArgs) -> int:
+        from ..tools import freeze
+
+        with connect(args.config.get_libpq_dsn()) as conn:
+            freeze.drop_update_tables(conn)
+        freeze.drop_flatnode_file(args.config.get_path('FLATNODE_FILE'))
+
+        return 0