X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/fb3353b854f40b8fd97ea942d3d9814e80e14779..85d65a2fd27cc5bc47685e7759a1895e1f9f2236:/nominatim/config.py diff --git a/nominatim/config.py b/nominatim/config.py index d4645b93..785f4acd 100644 --- a/nominatim/config.py +++ b/nominatim/config.py @@ -1,9 +1,17 @@ +# 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 @@ -11,6 +19,27 @@ 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. @@ -30,20 +59,27 @@ class Configuration: 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: + 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 + + 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 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. @@ -58,10 +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 @@ -93,7 +146,7 @@ class Configuration: if style in ('admin', 'street', 'address', 'full', 'extratags'): return self.config_dir / 'import-{}.style'.format(style) - return Path(style) + return self.find_config_file('', 'IMPORT_STYLE') def get_os_env(self): @@ -104,3 +157,98 @@ 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 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'))