Extract method loader()

radicale/auth/__init__.py

@@ -28,27 +28,14 @@ Take a look at the class ``BaseAuth`` if you want to implement your own.
 
 """
 
-from importlib import import_module
-
-from radicale.log import logger
+from radicale import utils
 
 INTERNAL_TYPES = ("none", "remote_user", "http_x_remote_user", "htpasswd")
 
 
 def load(configuration):
-    """Load the authentication manager chosen in configuration."""
-    auth_type = configuration.get("auth", "type")
-    if auth_type in INTERNAL_TYPES:
-        module = "radicale.auth.%s" % auth_type
-    else:
-        module = auth_type
-    try:
-        class_ = import_module(module).Auth
-    except Exception as e:
-        raise RuntimeError("Failed to load authentication module %r: %s" %
-                           (module, e)) from e
-    logger.info("Authentication type is %r", auth_type)
-    return class_(configuration)
+    """Load the authentication module chosen in configuration."""
+    return utils.loader(INTERNAL_TYPES, "auth", "Auth", configuration)
 
 
 class BaseAuth:

radicale/rights/__init__.py

@@ -30,27 +30,14 @@ Take a look at the class ``BaseRights`` if you want to implement your own.
 
 """
 
-from importlib import import_module
-
-from radicale.log import logger
+from radicale import utils
 
 INTERNAL_TYPES = ("authenticated", "owner_write", "owner_only", "from_file")
 
 
 def load(configuration):
-    """Load the rights manager chosen in configuration."""
-    rights_type = configuration.get("rights", "type")
-    if rights_type in INTERNAL_TYPES:
-        module = "radicale.rights.%s" % rights_type
-    else:
-        module = rights_type
-    try:
-        class_ = import_module(module).Rights
-    except Exception as e:
-        raise RuntimeError("Failed to load rights module %r: %s" %
-                           (module, e)) from e
-    logger.info("Rights type is %r", rights_type)
-    return class_(configuration)
+    """Load the rights module chosen in configuration."""
+    return utils.loader(INTERNAL_TYPES, "rights", "Rights", configuration)
 
 
 def intersect_permissions(a, b="RrWw"):

radicale/storage/__init__.py

@@ -26,13 +26,12 @@ Take a look at the class ``BaseCollection`` if you want to implement your own.
 import contextlib
 import json
 from hashlib import md5
-from importlib import import_module
 
 import pkg_resources
 import vobject
 
+from radicale import utils
 from radicale.item import filter as radicale_filter
-from radicale.log import logger
 
 INTERNAL_TYPES = ("multifilesystem",)
 
@@ -42,19 +41,8 @@ CACHE_VERSION = (";".join(pkg_resources.get_distribution(pkg).version
 
 
 def load(configuration):
-    """Load the storage manager chosen in configuration."""
-    storage_type = configuration.get("storage", "type")
-    if storage_type in INTERNAL_TYPES:
-        module = "radicale.storage.%s" % storage_type
-    else:
-        module = storage_type
-    try:
-        class_ = import_module(module).Storage
-    except Exception as e:
-        raise RuntimeError("Failed to load storage module %r: %s" %
-                           (module, e)) from e
-    logger.info("Storage type is %r", storage_type)
-    return class_(configuration)
+    """Load the storage module chosen in configuration."""
+    return utils.loader(INTERNAL_TYPES, "storage", "Storage", configuration)
 
 
 class ComponentExistsError(ValueError):

radicale/utils.py

@@ -0,0 +1,36 @@
+# This file is part of Radicale Server - Calendar Server
+# Copyright © 2014 Jean-Marc Martins
+# Copyright © 2012-2017 Guillaume Ayoub
+# Copyright © 2017-2018 Unrud <unrud@outlook.com>
+#
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Radicale.  If not, see <http://www.gnu.org/licenses/>.
+
+from importlib import import_module
+
+from radicale.log import logger
+
+
+def loader(internal_types, module_name, class_name, configuration):
+    type_ = configuration.get(module_name, "type")
+    if type_ in internal_types:
+        module = "radicale.%s.%s" % (module_name, type_)
+    else:
+        module = type_
+    try:
+        class_ = getattr(import_module(module), class_name)
+    except Exception as e:
+        raise RuntimeError("Failed to load %s module %r: %s" %
+                           (module_name, module, e)) from e
+    logger.info("%s type is %r", module_name, module)
+    return class_(configuration)

radicale/web/__init__.py

@@ -21,27 +21,14 @@ Take a look at the class ``BaseWeb`` if you want to implement your own.
 
 """
 
-from importlib import import_module
-
-from radicale.log import logger
+from radicale import utils
 
 INTERNAL_TYPES = ("none", "internal")
 
 
 def load(configuration):
     """Load the web module chosen in configuration."""
-    web_type = configuration.get("web", "type")
-    if web_type in INTERNAL_TYPES:
-        module = "radicale.web.%s" % web_type
-    else:
-        module = web_type
-    try:
-        class_ = import_module(module).Web
-    except Exception as e:
-        raise RuntimeError("Failed to load web module %r: %s" %
-                           (module, e)) from e
-    logger.info("Web type is %r", web_type)
-    return class_(configuration)
+    return utils.loader(INTERNAL_TYPES, "web", "Web", configuration)
 
 
 class BaseWeb: