X-Git-Url: https://git.openstreetmap.org/nominatim.git/blobdiff_plain/a5970d75486bae0f0532b4e4bb12e82d625c4750..301cfab970e37ddbe8d5ff7ddb2d207fbc5a014f:/nominatim/config.py diff --git a/nominatim/config.py b/nominatim/config.py index a8436440..3344a425 100644 --- a/nominatim/config.py +++ b/nominatim/config.py @@ -1,85 +1,186 @@ +# 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] = {} -class Configuration: - """ Load and manage the project configuration. +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 - Nominatim uses dotenv to configure the software. Configuration options - are resolved in the following order: - * 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 +class Configuration: + """ This class wraps access to the configuration settings + for the Nominatim instance in use. All Nominatim configuration options are prefixed with 'NOMINATIM_' to - avoid conflicts with other environment variables. + avoid conflicts with other environment variables. All settings can + be accessed as properties of the class under the same name as the + setting but with the `NOMINATIM_` prefix removed. In addition, there + are accessor functions that convert the setting values to types + other than string. """ - def __init__(self, project_dir, config_dir, environ=None): + 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_dir = config_dir - self._config = dotenv_values(str((config_dir / 'env.defaults').resolve())) - if project_dir is not None and (project_dir / '.env').is_file(): - self._config.update(dotenv_values(str((project_dir / '.env').resolve()))) - - # 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.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: - pass + module: Path + osm2pgsql: Path + php = nominatim.paths.PHPLIB_DIR + sql = nominatim.paths.SQLLIB_DIR + data = nominatim.paths.DATA_DIR self.lib_dir = _LibDirs() + self._private_plugins: Dict[str, object] = {} + - def set_libdirs(self, **kwargs): + 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).resolve()) + setattr(self.lib_dir, key, Path(value)) - def __getattr__(self, name): + + def __getattr__(self, name: str) -> str: name = 'NOMINATIM_' + name - return self.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): + + 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. + + Parameters: + name: Name of the configuration parameter with the NOMINATIM_ + prefix removed. + + Returns: + `True` for values of '1', 'yes' and 'true', `False` otherwise. """ - return self.__getattr__(name).lower() in ('1', 'yes', 'true') + return getattr(self, name).lower() in ('1', 'yes', 'true') - def get_int(self, name): + def get_int(self, name: str) -> int: """ Return the given configuration parameter as an int. + + Parameters: + name: Name of the configuration parameter with the NOMINATIM_ + prefix removed. + + Returns: + The configuration value converted to int. + + Raises: + ValueError: when the value is not a number. """ try: - return int(self.__getattr__(name)) + 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_libpq_dsn(self): + 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. + + Parameters: + name: Name of the configuration parameter with the NOMINATIM_ + prefix removed. + + Returns: + (List[str]): The comma-split parameter as a list. The + elements are stripped of leading and final spaces before + being returned. + (None): The configuration parameter was unset or empty. + """ + 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. + + Parameters: + name: Name of the configuration parameter with the NOMINATIM_ + prefix removed. + + Returns: + (Path): A Path object of the parameter value. + If a relative path is configured, then the function converts this + into an absolute path with the project directory as root path. + (None): The configuration parameter was unset or empty. + """ + 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) -> str: """ Get configured database DSN converted into the key/value format understood by libpq and psycopg. """ dsn = self.DATABASE_DSN - def quote_param(param): + def quote_param(param: str) -> str: key, val = param.split('=') val = val.replace('\\', '\\\\').replace("'", "\\'") if ' ' in val: @@ -93,24 +194,181 @@ class Configuration: return dsn - def get_import_style_file(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 = self.__getattr__('IMPORT_STYLE') + style = getattr(self, '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}.lua' - return Path(style) + return self.find_config_file('', 'IMPORT_STYLE') - def get_os_env(self): + 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 = {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'))