+# 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.
"""
+from typing import Dict, Any, List, Mapping, Optional
+import importlib.util
+import logging
import os
+import sys
+from pathlib import Path
+import json
+import yaml
from dotenv import dotenv_values
+from psycopg2.extensions import parse_dsn
+
+from nominatim.typing import StrPath
+from nominatim.errors import UsageError
+import nominatim.paths
+
+LOG = logging.getLogger()
+CONFIG_CACHE : Dict[str, Any] = {}
+
+def flatten_config_list(content: Any, section: str = '') -> List[Any]:
+ """ 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 dictionary 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: Optional[Path],
+ environ: Optional[Mapping[str, str]] = None) -> None:
+ self.environ = environ or os.environ
self.project_dir = project_dir
- self._config = dotenv_values(str((config_dir / 'env.defaults').resolve()))
- if project_dir is not None:
- self._config.update(dotenv_values(str((project_dir / '.env').resolve())))
+ self.config_dir = nominatim.paths.CONFIG_DIR
+ self._config = dotenv_values(str(self.config_dir / 'env.defaults'))
+ if self.project_dir is not None and (self.project_dir / '.env').is_file():
+ self.project_dir = self.project_dir.resolve()
+ self._config.update(dotenv_values(str(self.project_dir / '.env')))
+
+ class _LibDirs:
+ module: Path
+ osm2pgsql: Path
+ php = nominatim.paths.PHPLIB_DIR
+ sql = nominatim.paths.SQLLIB_DIR
+ data = nominatim.paths.DATA_DIR
- # Add defaults for variables that are left empty to set the default.
- # They may still be overwritten by environment variables.
- if not self._config['NOMINATIM_ADDRESS_LEVEL_CONFIG']:
- self._config['NOMINATIM_ADDRESS_LEVEL_CONFIG'] = \
- str(config_dir / 'address-levels.json')
+ self.lib_dir = _LibDirs()
+ self._private_plugins: Dict[str, object] = {}
- def __getattr__(self, name):
+ def set_libdirs(self, **kwargs: StrPath) -> None:
+ """ Set paths to library functions and data.
+ """
+ for key, value in kwargs.items():
+ setattr(self.lib_dir, key, Path(value))
+
+
+ def __getattr__(self, name: str) -> str:
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] or ''
+
- def get_bool(self, name):
- """ Return the given configuration parameters as a boolean.
+ def get_bool(self, name: str) -> bool:
+ """ 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')
+ return getattr(self, name).lower() in ('1', 'yes', 'true')
+
+
+ def get_int(self, name: str) -> int:
+ """ Return the given configuration parameter as an int.
+ """
+ try:
+ return int(getattr(self, 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_str_list(self, name: str) -> Optional[List[str]]:
+ """ 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 = getattr(self, name)
+
+ return [v.strip() for v in raw.split(',')] if raw else None
+
+
+ def get_path(self, name: str) -> Optional[Path]:
+ """ 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, None is returned.
+ """
+ value = getattr(self, name)
+ if not value:
+ return None
+
+ cfgpath = Path(value)
+
+ if not cfgpath.is_absolute():
+ assert self.project_dir is not None
+ cfgpath = self.project_dir / cfgpath
+
+ return cfgpath.resolve()
- def get_libpq_dsn(self):
+
+ def get_libpq_dsn(self) -> str:
""" Get configured database DSN converted into the key/value format
understood by libpq and psycopg.
"""
dsn = self.DATABASE_DSN
+ def quote_param(param: str) -> str:
+ 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 dsn[6:].replace(';', ' ')
+ return ' '.join([quote_param(p) for p in dsn[6:].split(';')])
return dsn
- def get_os_env(self):
+
+ def get_database_params(self) -> Mapping[str, str]:
+ """ Get the configured parameters for the database connection
+ as a mapping.
+ """
+ dsn = self.DATABASE_DSN
+
+ if dsn.startswith('pgsql:'):
+ return dict((p.split('=', 1) for p in dsn[6:].split(';')))
+
+ return parse_dsn(dsn)
+
+
+ def get_import_style_file(self) -> Path:
+ """ 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 = getattr(self, 'IMPORT_STYLE')
+
+ if style in ('admin', 'street', 'address', 'full', 'extratags'):
+ return self.config_dir / f'import-{style}.lua'
+
+ return self.find_config_file('', 'IMPORT_STYLE')
+
+
+ def get_os_env(self) -> Dict[str, str]:
""" Return a copy of the OS environment with the Nominatim configuration
merged in.
"""
- env = dict(self._config)
- env.update(os.environ)
+ env = {k: v for k, v in self._config.items() if v is not None}
+ env.update(self.environ)
return env
+
+
+ def load_sub_configuration(self, filename: StrPath,
+ config: Optional[str] = None) -> Any:
+ """ 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 directory.
+
+ 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 str(configfile) in CONFIG_CACHE:
+ return CONFIG_CACHE[str(configfile)]
+
+ 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.")
+
+ CONFIG_CACHE[str(configfile)] = result
+ return result
+
+
+ def load_plugin_module(self, module_name: str, internal_path: str) -> Any:
+ """ Load a Python module as a plugin.
+
+ The module_name may have three variants:
+
+ * A name without any '.' is assumed to be an internal module
+ and will be searched relative to `internal_path`.
+ * If the name ends in `.py`, module_name is assumed to be a
+ file name relative to the project directory.
+ * Any other name is assumed to be an absolute module name.
+
+ In either of the variants the module name must start with a letter.
+ """
+ if not module_name or not module_name[0].isidentifier():
+ raise UsageError(f'Invalid module name {module_name}')
+
+ if '.' not in module_name:
+ module_name = module_name.replace('-', '_')
+ full_module = f'{internal_path}.{module_name}'
+ return sys.modules.get(full_module) or importlib.import_module(full_module)
+
+ if module_name.endswith('.py'):
+ if self.project_dir is None or not (self.project_dir / module_name).exists():
+ raise UsageError(f"Cannot find module '{module_name}' in project directory.")
+
+ if module_name in self._private_plugins:
+ return self._private_plugins[module_name]
+
+ file_path = str(self.project_dir / module_name)
+ spec = importlib.util.spec_from_file_location(module_name, file_path)
+ if spec:
+ module = importlib.util.module_from_spec(spec)
+ # Do not add to global modules because there is no standard
+ # module name that Python can resolve.
+ self._private_plugins[module_name] = module
+ assert spec.loader is not None
+ spec.loader.exec_module(module)
+
+ return module
+
+ return sys.modules.get(module_name) or importlib.import_module(module_name)
+
+
+ def find_config_file(self, filename: StrPath,
+ config: Optional[str] = None) -> Path:
+ """ 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_value = getattr(self, config)
+ if cfg_value:
+ cfg_filename = Path(cfg_value)
+
+ 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: Path) -> Any:
+ """ 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: Any, node: yaml.Node) -> Any:
+ """ 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 directory.
+ """
+ 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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