add get_str_list() for config

[nominatim.git] / nominatim / config.py

diff --git a/nominatim/config.py b/nominatim/config.py
index bc3556f3cdf101f722df036730eb7311d88c6474..700af328d093dbf6f145966c21e9f4cb9a79a5f8 100644 (file)
--- a/nominatim/config.py
+++ b/nominatim/config.py
@@ -1,3 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2022 by the Nominatim developer community.
+# For a full list of authors see the git log.
 """
 Nominatim configuration accessor.
 """
@@ -12,7 +18,7 @@ from dotenv import dotenv_values
 from nominatim.errors import UsageError
 
 LOG = logging.getLogger()
-
+CONFIG_CACHE = {}
 
 def flatten_config_list(content, section=''):
     """ Flatten YAML configuration lists that contain include sections
@@ -93,6 +99,17 @@ class Configuration:
             raise UsageError("Configuration error.") from exp
 
 
+    def get_str_list(self, name):
+        """ Return the given configuration parameter as a list of strings.
+            The values are assumed to be given as a comma-sparated list and
+            will be stripped before returning them. On empty values None
+            is returned.
+        """
+        raw = self.__getattr__(name)
+
+        return [v.strip() for v in raw.split(',')] if raw else None
+
+
     def get_path(self, name):
         """ Return the given configuration parameter as a Path.
             If a relative path is configured, then the function converts this
@@ -138,7 +155,7 @@ class Configuration:
         style = self.__getattr__('IMPORT_STYLE')
 
         if style in ('admin', 'street', 'address', 'full', 'extratags'):
-            return self.config_dir / 'import-{}.style'.format(style)
+            return self.config_dir / f'import-{style}.style'
 
         return self.find_config_file('', 'IMPORT_STYLE')
 
@@ -175,14 +192,19 @@ class Configuration:
         """
         configfile = self.find_config_file(filename, config)
 
-        if configfile.suffix in ('.yaml', '.yml'):
-            return self._load_from_yaml(configfile)
+        if str(configfile) in CONFIG_CACHE:
+            return CONFIG_CACHE[str(configfile)]
 
-        if configfile.suffix == '.json':
-            with configfile.open('r') as cfg:
-                return json.load(cfg)
+        if configfile.suffix in ('.yaml', '.yml'):
+            result = self._load_from_yaml(configfile)
+        elif configfile.suffix == '.json':
+            with configfile.open('r', encoding='utf-8') as cfg:
+                result = json.load(cfg)
+        else:
+            raise UsageError(f"Config file '{configfile}' has unknown format.")
 
-        raise UsageError(f"Config file '{configfile}' has unknown format.")
+        CONFIG_CACHE[str(configfile)] = result
+        return result
 
 
     def find_config_file(self, filename, config=None):