X-Git-Url: https://git.openstreetmap.org/nominatim.git/blobdiff_plain/68bd9c6091521a53206fa2996b26ca26834f8df8..bb2bd76f91ed6e4b1530a7fb66553c7fd92afd9d:/nominatim/config.py diff --git a/nominatim/config.py b/nominatim/config.py index 72aaf0bd..ef261079 100644 --- a/nominatim/config.py +++ b/nominatim/config.py @@ -1,15 +1,44 @@ +# 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() +CONFIG_CACHE = {} + +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. @@ -33,12 +62,6 @@ class Configuration: 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') - class _LibDirs: pass @@ -53,7 +76,10 @@ class Configuration: def __getattr__(self, name): 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] def get_bool(self, name): """ Return the given configuration parameter as a boolean. @@ -68,10 +94,27 @@ class Configuration: """ try: return int(self.__getattr__(name)) - except ValueError: + except ValueError as exp: LOG.fatal("Invalid setting NOMINATIM_%s. Needs to be a number.", name) - raise UsageError("Configuration error.") + 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 @@ -101,9 +144,9 @@ 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 Path(style) + return self.find_config_file('', 'IMPORT_STYLE') def get_os_env(self): @@ -114,3 +157,103 @@ class Configuration: 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 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 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'))