merge branche "@"

sat/tools/config.py

@@ -23,6 +23,7 @@
 import os
 import csv
 import json
+from typing import Any
 from configparser import ConfigParser, DEFAULTSECT, NoOptionError, NoSectionError
 from xdg import BaseDirectory
 from sat.core.log import getLogger
@@ -142,3 +143,29 @@ def getConfig(config, section, name, default=None):
         except ValueError as e:
             raise exceptions.ParsingError("Error while parsing data: {}".format(e))
     return value
+
+
+def getConf(
+    conf: ConfigParser,
+    prefix: str,
+    section: str,
+    name: str,
+    default: Any
+) -> Any:
+    """Get configuration value from environment or config file
+
+    @param str: prefix to use for the varilable name (see `name` below)
+    @param section: config section to use
+    @param name: unsuffixed name.
+        For environment variable, `LIBERVIA_<prefix>_` will be prefixed (and name
+        will be set to uppercase).
+        For config file, `<prefix>_` will be prefixed (and DEFAULT section will be
+        used).
+        Environment variable has priority over config values. If Environment variable
+        is set but empty string, config value will be used.
+    @param default: default value to use if varilable is set neither in environment,
+    nor in config
+    """
+    # XXX: This is a temporary method until parameters are refactored
+    value = os.getenv(f"LIBERVIA_{prefix}_{name}".upper())
+    return value or getConfig(conf, section, f"{prefix}_{name}", default)