add wsgi entry point for starlette

[nominatim.git] / nominatim / config.py

diff --git a/nominatim/config.py b/nominatim/config.py
index 3f75ce33eecb5e46839984a3df1f700ba0a51fc4..3a4c3a6bed038ec9bb03f27eeb90979fbf675ca9 100644 (file)
--- a/nominatim/config.py
+++ b/nominatim/config.py
@@ -1,9 +1,50 @@
+# 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.
 """
 """
 Nominatim configuration accessor.
 """

+from typing import Dict, Any, List, Mapping, Optional
+import importlib.util
+import logging

 import os
 import os

+import sys
+from pathlib import Path
+import json
+import yaml

 
 from dotenv import dotenv_values
 
 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.
 
 class Configuration:
     """ Load and manage the project configuration.


@@ -11,7 +52,7 @@ class Configuration:
         Nominatim uses dotenv to configure the software. Configuration options
         are resolved in the following order:
 
         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
 
          * from the .env file in the project directory of the installation
          * from the default installation in the configuration directory
 


@@ -19,48 +60,286 @@ class Configuration:
         avoid conflicts with other environment variables.
     """
 
         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.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
 
         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.
         """
             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
 
         """ 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.
         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
 
 
         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.
         """
         """ 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
 
         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'))