+# 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.
"""
+import logging
import os
+from pathlib import Path
+import json
+import yaml
from dotenv import dotenv_values
+from nominatim.errors import UsageError
+
+LOG = logging.getLogger()
+
+
+def flatten_config_list(content, section=''):
+ """ Flatten YAML configuration lists that contain include sections
+ which are lists themselves.
+ """
+ if not content:
+ return []
+
+ if not isinstance(content, list):
+ raise UsageError(f"List expected in section '{section}'.")
+
+ output = []
+ for ele in content:
+ if isinstance(ele, list):
+ output.extend(flatten_config_list(ele, section))
+ else:
+ output.append(ele)
+
+ return output
+
+
class Configuration:
""" Load and manage the project configuration.
Nominatim uses dotenv to configure the software. Configuration options
are resolved in the following order:
- * from the OS environment
+ * from the OS environment (or the dirctionary given in `environ`
* from the .env file in the project directory of the installation
* from the default installation in the configuration directory
avoid conflicts with other environment variables.
"""
- def __init__(self, project_dir, config_dir):
+ def __init__(self, project_dir, config_dir, environ=None):
+ self.environ = environ or os.environ
+ self.project_dir = project_dir
+ self.config_dir = config_dir
self._config = dotenv_values(str((config_dir / 'env.defaults').resolve()))
- self._config.update(dotenv_values(str((project_dir / '.env').resolve())))
+ if project_dir is not None and (project_dir / '.env').is_file():
+ self._config.update(dotenv_values(str((project_dir / '.env').resolve())))
+
+ class _LibDirs:
+ pass
+
+ self.lib_dir = _LibDirs()
+
+ def set_libdirs(self, **kwargs):
+ """ Set paths to library functions and data.
+ """
+ for key, value in kwargs.items():
+ setattr(self.lib_dir, key, Path(value).resolve())
def __getattr__(self, name):
name = 'NOMINATIM_' + name
- return os.environ.get(name) or self._config[name]
+ if name in self.environ:
+ return self.environ[name]
+
+ return self._config[name]
+
+ def get_bool(self, name):
+ """ Return the given configuration parameter as a boolean.
+ Values of '1', 'yes' and 'true' are accepted as truthy values,
+ everything else is interpreted as false.
+ """
+ return self.__getattr__(name).lower() in ('1', 'yes', 'true')
+
+
+ def get_int(self, name):
+ """ Return the given configuration parameter as an int.
+ """
+ try:
+ return int(self.__getattr__(name))
+ except ValueError as exp:
+ LOG.fatal("Invalid setting NOMINATIM_%s. Needs to be a number.", name)
+ raise UsageError("Configuration error.") from exp
+
+
+ def get_path(self, name):
+ """ Return the given configuration parameter as a Path.
+ If a relative path is configured, then the function converts this
+ into an absolute path with the project directory as root path.
+ If the configuration is unset, a falsy value is returned.
+ """
+ value = self.__getattr__(name)
+ if value:
+ value = Path(value)
+
+ if not value.is_absolute():
+ value = self.project_dir / value
+
+ value = value.resolve()
+
+ return value
+
+ def get_libpq_dsn(self):
+ """ Get configured database DSN converted into the key/value format
+ understood by libpq and psycopg.
+ """
+ dsn = self.DATABASE_DSN
+
+ def quote_param(param):
+ key, val = param.split('=')
+ val = val.replace('\\', '\\\\').replace("'", "\\'")
+ if ' ' in val:
+ val = "'" + val + "'"
+ return key + '=' + val
+
+ if dsn.startswith('pgsql:'):
+ # Old PHP DSN format. Convert before returning.
+ return ' '.join([quote_param(p) for p in dsn[6:].split(';')])
+
+ return dsn
+
+
+ def get_import_style_file(self):
+ """ Return the import style file as a path object. Translates the
+ name of the standard styles automatically into a file in the
+ config style.
+ """
+ style = self.__getattr__('IMPORT_STYLE')
+
+ if style in ('admin', 'street', 'address', 'full', 'extratags'):
+ return self.config_dir / 'import-{}.style'.format(style)
+
+ return self.find_config_file('', 'IMPORT_STYLE')
+
def get_os_env(self):
""" Return a copy of the OS environment with the Nominatim configuration
merged in.
"""
env = dict(self._config)
- env.update(os.environ)
+ env.update(self.environ)
return env
+
+
+ def load_sub_configuration(self, filename, config=None):
+ """ Load additional configuration from a file. `filename` is the name
+ of the configuration file. The file is first searched in the
+ project directory and then in the global settings dirctory.
+
+ If `config` is set, then the name of the configuration file can
+ be additionally given through a .env configuration option. When
+ the option is set, then the file will be exclusively loaded as set:
+ if the name is an absolute path, the file name is taken as is,
+ if the name is relative, it is taken to be relative to the
+ project directory.
+
+ The format of the file is determined from the filename suffix.
+ Currently only files with extension '.yaml' are supported.
+
+ YAML files support a special '!include' construct. When the
+ directive is given, the value is taken to be a filename, the file
+ is loaded using this function and added at the position in the
+ configuration tree.
+ """
+ configfile = self.find_config_file(filename, config)
+
+ if configfile.suffix in ('.yaml', '.yml'):
+ return self._load_from_yaml(configfile)
+
+ if configfile.suffix == '.json':
+ with configfile.open('r') as cfg:
+ return json.load(cfg)
+
+ raise UsageError(f"Config file '{configfile}' has unknown format.")
+
+
+ def find_config_file(self, filename, config=None):
+ """ Resolve the location of a configuration file given a filename and
+ an optional configuration option with the file name.
+ Raises a UsageError when the file cannot be found or is not
+ a regular file.
+ """
+ if config is not None:
+ cfg_filename = self.__getattr__(config)
+ if cfg_filename:
+ cfg_filename = Path(cfg_filename)
+
+ if cfg_filename.is_absolute():
+ cfg_filename = cfg_filename.resolve()
+
+ if not cfg_filename.is_file():
+ LOG.fatal("Cannot find config file '%s'.", cfg_filename)
+ raise UsageError("Config file not found.")
+
+ return cfg_filename
+
+ filename = cfg_filename
+
+
+ search_paths = [self.project_dir, self.config_dir]
+ for path in search_paths:
+ if path is not None and (path / filename).is_file():
+ return path / filename
+
+ LOG.fatal("Configuration file '%s' not found.\nDirectories searched: %s",
+ filename, search_paths)
+ raise UsageError("Config file not found.")
+
+
+ def _load_from_yaml(self, cfgfile):
+ """ Load a YAML configuration file. This installs a special handler that
+ allows to include other YAML files using the '!include' operator.
+ """
+ yaml.add_constructor('!include', self._yaml_include_representer,
+ Loader=yaml.SafeLoader)
+ return yaml.safe_load(cfgfile.read_text(encoding='utf-8'))
+
+
+ def _yaml_include_representer(self, loader, node):
+ """ Handler for the '!include' operator in YAML files.
+
+ When the filename is relative, then the file is first searched in the
+ project directory and then in the global settings dirctory.
+ """
+ fname = loader.construct_scalar(node)
+
+ if Path(fname).is_absolute():
+ configfile = Path(fname)
+ else:
+ configfile = self.find_config_file(loader.construct_scalar(node))
+
+ if configfile.suffix != '.yaml':
+ LOG.fatal("Format error while reading '%s': only YAML format supported.",
+ configfile)
+ raise UsageError("Cannot handle config file format.")
+
+ return yaml.safe_load(configfile.read_text(encoding='utf-8'))
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