add function for parallel execution of SQL scripts

[nominatim.git] / nominatim / config.py

diff --git a/nominatim/config.py b/nominatim/config.py
index f316280bb42bf1dfc71bb5b1e16704bbdfcafa5c..7502aff703ebaaf4610ddc4b591d212957c1229c 100644 (file)
--- a/nominatim/config.py
+++ b/nominatim/config.py
@@ -1,19 +1,30 @@
+# 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 logging
 import os

+import sys

 from pathlib import Path
 from pathlib import Path

+import json

 import yaml
 
 from dotenv import dotenv_values
 
 import yaml
 
 from dotenv import dotenv_values
 

+from nominatim.typing import StrPath

 from nominatim.errors import UsageError
 
 LOG = logging.getLogger()
 from nominatim.errors import UsageError
 
 LOG = logging.getLogger()

+CONFIG_CACHE : Dict[str, Any] = {}

 
 

-
-def flatten_config_list(content, section=''):
+def flatten_config_list(content: Any, section: str = '') -> List[Any]:

     """ Flatten YAML configuration lists that contain include sections
         which are lists themselves.
     """
     """ Flatten YAML configuration lists that contain include sections
         which are lists themselves.
     """


@@ -47,7 +58,8 @@ class Configuration:
         avoid conflicts with other environment variables.
     """
 
         avoid conflicts with other environment variables.
     """
 

-    def __init__(self, project_dir, config_dir, environ=None):
+    def __init__(self, project_dir: Path, config_dir: 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.environ = environ or os.environ
         self.project_dir = project_dir
         self.config_dir = config_dir


@@ -55,56 +67,87 @@ class Configuration:
         if project_dir is not None and (project_dir / '.env').is_file():
             self._config.update(dotenv_values(str((project_dir / '.env').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')
-

         class _LibDirs:
         class _LibDirs:

-            pass
+            module: Path
+            osm2pgsql: Path
+            php: Path
+            sql: Path
+            data: Path

 
         self.lib_dir = _LibDirs()
 
         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())
 
         """ 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):
+
+    def __getattr__(self, name: str) -> str:

         name = 'NOMINATIM_' + name
 
         if name in self.environ:
             return self.environ[name]
 
         name = 'NOMINATIM_' + name
 
         if name in self.environ:
             return self.environ[name]
 

-        return self._config[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.
         """
         """ 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.
         """

-        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.
         """
         try:
         """ Return the given configuration parameter as an int.
         """
         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
 
 
         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. 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():
+            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
 
         """ 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:
             key, val = param.split('=')
             val = val.replace('\\', '\\\\').replace("'", "\\'")
             if ' ' in val:


@@ -118,20 +161,20 @@ class Configuration:
         return dsn
 
 
         return dsn
 
 

-    def get_import_style_file(self):
+    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.
         """
         """ 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'):
 
         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):
+    def get_os_env(self) -> Dict[str, Optional[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.
         """


@@ -141,10 +184,11 @@ class Configuration:
         return env
 
 
         return env
 
 

-    def load_sub_configuration(self, filename, config=None):
+    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
         """ 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.
+            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
 
             If `config` is set, then the name of the configuration file can
             be additionally given through a .env configuration option. When


@@ -161,23 +205,77 @@ class Configuration:
             is loaded using this function and added at the position in the
             configuration tree.
         """
             is loaded using this function and added at the position in the
             configuration tree.
         """

-        assert Path(filename).suffix == '.yaml'
+        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)

 
 

-        configfile = self._find_config_file(filename, config)
+                return module

 
 

-        return self._load_from_yaml(configfile)
+        return sys.modules.get(module_name) or importlib.import_module(module_name)

 
 
 
 

-    def _find_config_file(self, filename, config=None):
+    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:
         """ 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)
+            cfg_value = getattr(self, config)
+            if cfg_value:
+                cfg_filename = Path(cfg_value)

 
                 if cfg_filename.is_absolute():
                     cfg_filename = cfg_filename.resolve()
 
                 if cfg_filename.is_absolute():
                     cfg_filename = cfg_filename.resolve()


@@ -201,7 +299,7 @@ class Configuration:
         raise UsageError("Config file not found.")
 
 
         raise UsageError("Config file not found.")
 
 

-    def _load_from_yaml(self, cfgfile):
+    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.
         """
         """ Load a YAML configuration file. This installs a special handler that
             allows to include other YAML files using the '!include' operator.
         """


@@ -210,18 +308,18 @@ class Configuration:
         return yaml.safe_load(cfgfile.read_text(encoding='utf-8'))
 
 
         return yaml.safe_load(cfgfile.read_text(encoding='utf-8'))
 
 

-    def _yaml_include_representer(self, loader, node):
+    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
         """ 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.
+            project directory and then in the global settings directory.

         """
         fname = loader.construct_scalar(node)
 
         if Path(fname).is_absolute():
             configfile = Path(fname)
         else:
         """
         fname = loader.construct_scalar(node)
 
         if Path(fname).is_absolute():
             configfile = Path(fname)
         else:

-            configfile = self._find_config_file(loader.construct_scalar(node))
+            configfile = self.find_config_file(loader.construct_scalar(node))

 
         if configfile.suffix != '.yaml':
             LOG.fatal("Format error while reading '%s': only YAML format supported.",
 
         if configfile.suffix != '.yaml':
             LOG.fatal("Format error while reading '%s': only YAML format supported.",