mirror of
https://github.com/osm-search/Nominatim.git
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e65913d376
Reading the YAML files is fairly expensive and slows down the BDD tests significantly. Therefore cache the results from reading the file.
260 lines
8.9 KiB
Python
260 lines
8.9 KiB
Python
# SPDX-License-Identifier: GPL-2.0-only
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#
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# This file is part of Nominatim. (https://nominatim.org)
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#
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# Copyright (C) 2022 by the Nominatim developer community.
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# For a full list of authors see the git log.
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"""
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Nominatim configuration accessor.
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"""
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import logging
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import os
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from pathlib import Path
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import json
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import yaml
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from dotenv import dotenv_values
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from nominatim.errors import UsageError
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LOG = logging.getLogger()
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CONFIG_CACHE = {}
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def flatten_config_list(content, section=''):
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""" Flatten YAML configuration lists that contain include sections
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which are lists themselves.
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"""
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if not content:
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return []
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if not isinstance(content, list):
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raise UsageError(f"List expected in section '{section}'.")
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output = []
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for ele in content:
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if isinstance(ele, list):
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output.extend(flatten_config_list(ele, section))
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else:
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output.append(ele)
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return output
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class Configuration:
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""" Load and manage the project configuration.
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Nominatim uses dotenv to configure the software. Configuration options
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are resolved in the following order:
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* from the OS environment (or the dirctionary given in `environ`
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* from the .env file in the project directory of the installation
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* from the default installation in the configuration directory
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All Nominatim configuration options are prefixed with 'NOMINATIM_' to
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avoid conflicts with other environment variables.
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"""
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def __init__(self, project_dir, config_dir, environ=None):
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self.environ = environ or os.environ
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self.project_dir = project_dir
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self.config_dir = config_dir
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self._config = dotenv_values(str((config_dir / 'env.defaults').resolve()))
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if project_dir is not None and (project_dir / '.env').is_file():
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self._config.update(dotenv_values(str((project_dir / '.env').resolve())))
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class _LibDirs:
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pass
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self.lib_dir = _LibDirs()
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def set_libdirs(self, **kwargs):
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""" Set paths to library functions and data.
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"""
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for key, value in kwargs.items():
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setattr(self.lib_dir, key, Path(value).resolve())
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def __getattr__(self, name):
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name = 'NOMINATIM_' + name
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if name in self.environ:
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return self.environ[name]
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return self._config[name]
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def get_bool(self, name):
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""" Return the given configuration parameter as a boolean.
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Values of '1', 'yes' and 'true' are accepted as truthy values,
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everything else is interpreted as false.
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"""
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return self.__getattr__(name).lower() in ('1', 'yes', 'true')
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def get_int(self, name):
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""" Return the given configuration parameter as an int.
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"""
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try:
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return int(self.__getattr__(name))
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except ValueError as exp:
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LOG.fatal("Invalid setting NOMINATIM_%s. Needs to be a number.", name)
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raise UsageError("Configuration error.") from exp
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def get_path(self, name):
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""" Return the given configuration parameter as a Path.
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If a relative path is configured, then the function converts this
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into an absolute path with the project directory as root path.
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If the configuration is unset, a falsy value is returned.
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"""
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value = self.__getattr__(name)
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if value:
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value = Path(value)
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if not value.is_absolute():
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value = self.project_dir / value
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value = value.resolve()
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return value
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def get_libpq_dsn(self):
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""" Get configured database DSN converted into the key/value format
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understood by libpq and psycopg.
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"""
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dsn = self.DATABASE_DSN
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def quote_param(param):
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key, val = param.split('=')
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val = val.replace('\\', '\\\\').replace("'", "\\'")
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if ' ' in val:
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val = "'" + val + "'"
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return key + '=' + val
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if dsn.startswith('pgsql:'):
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# Old PHP DSN format. Convert before returning.
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return ' '.join([quote_param(p) for p in dsn[6:].split(';')])
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return dsn
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def get_import_style_file(self):
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""" Return the import style file as a path object. Translates the
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name of the standard styles automatically into a file in the
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config style.
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"""
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style = self.__getattr__('IMPORT_STYLE')
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if style in ('admin', 'street', 'address', 'full', 'extratags'):
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return self.config_dir / 'import-{}.style'.format(style)
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return self.find_config_file('', 'IMPORT_STYLE')
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def get_os_env(self):
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""" Return a copy of the OS environment with the Nominatim configuration
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merged in.
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"""
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env = dict(self._config)
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env.update(self.environ)
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return env
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def load_sub_configuration(self, filename, config=None):
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""" Load additional configuration from a file. `filename` is the name
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of the configuration file. The file is first searched in the
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project directory and then in the global settings dirctory.
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If `config` is set, then the name of the configuration file can
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be additionally given through a .env configuration option. When
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the option is set, then the file will be exclusively loaded as set:
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if the name is an absolute path, the file name is taken as is,
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if the name is relative, it is taken to be relative to the
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project directory.
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The format of the file is determined from the filename suffix.
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Currently only files with extension '.yaml' are supported.
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YAML files support a special '!include' construct. When the
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directive is given, the value is taken to be a filename, the file
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is loaded using this function and added at the position in the
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configuration tree.
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"""
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configfile = self.find_config_file(filename, config)
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if str(configfile) in CONFIG_CACHE:
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return CONFIG_CACHE[str(configfile)]
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if configfile.suffix in ('.yaml', '.yml'):
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result = self._load_from_yaml(configfile)
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elif configfile.suffix == '.json':
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with configfile.open('r') as cfg:
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result = json.load(cfg)
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else:
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raise UsageError(f"Config file '{configfile}' has unknown format.")
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CONFIG_CACHE[str(configfile)] = result
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return result
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def find_config_file(self, filename, config=None):
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""" Resolve the location of a configuration file given a filename and
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an optional configuration option with the file name.
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Raises a UsageError when the file cannot be found or is not
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a regular file.
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"""
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if config is not None:
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cfg_filename = self.__getattr__(config)
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if cfg_filename:
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cfg_filename = Path(cfg_filename)
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if cfg_filename.is_absolute():
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cfg_filename = cfg_filename.resolve()
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if not cfg_filename.is_file():
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LOG.fatal("Cannot find config file '%s'.", cfg_filename)
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raise UsageError("Config file not found.")
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return cfg_filename
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filename = cfg_filename
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search_paths = [self.project_dir, self.config_dir]
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for path in search_paths:
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if path is not None and (path / filename).is_file():
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return path / filename
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LOG.fatal("Configuration file '%s' not found.\nDirectories searched: %s",
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filename, search_paths)
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raise UsageError("Config file not found.")
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def _load_from_yaml(self, cfgfile):
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""" Load a YAML configuration file. This installs a special handler that
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allows to include other YAML files using the '!include' operator.
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"""
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yaml.add_constructor('!include', self._yaml_include_representer,
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Loader=yaml.SafeLoader)
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return yaml.safe_load(cfgfile.read_text(encoding='utf-8'))
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def _yaml_include_representer(self, loader, node):
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""" Handler for the '!include' operator in YAML files.
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When the filename is relative, then the file is first searched in the
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project directory and then in the global settings dirctory.
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"""
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fname = loader.construct_scalar(node)
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if Path(fname).is_absolute():
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configfile = Path(fname)
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else:
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configfile = self.find_config_file(loader.construct_scalar(node))
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if configfile.suffix != '.yaml':
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LOG.fatal("Format error while reading '%s': only YAML format supported.",
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configfile)
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raise UsageError("Cannot handle config file format.")
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return yaml.safe_load(configfile.read_text(encoding='utf-8'))
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