Initial commit to gerrit repo

[osm/PLA.git] / osm_pla / config / config.py

diff --git a/osm_pla/config/config.py b/osm_pla/config/config.py
new file mode 100644 (file)
index 0000000..114fc5f
--- /dev/null
+++ b/osm_pla/config/config.py
@@ -0,0 +1,65 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 ArctosLabs Scandinavia AB
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Global configuration managed by environment variables."""
+
+import logging
+import os
+
+import pkg_resources
+import yaml
+
+logger = logging.getLogger(__name__)
+
+
+class Config:
+    def __init__(self, config_file: str = ''):
+        self.conf = {}
+        self._read_config_file(config_file)
+        self._read_env()
+
+    def _read_config_file(self, config_file):
+        if not config_file:
+            path = 'pla.yaml'
+            config_file = pkg_resources.resource_filename(__name__, path)
+        with open(config_file) as f:
+            self.conf = yaml.load(f)
+
+    def _read_env(self):
+        for env in os.environ:
+            if not env.startswith("OSMPLA_"):
+                continue
+            elements = env.lower().split("_")
+            if len(elements) < 3:
+                logger.warning(
+                    "Environment variable %s=%s does not comply with required format. Section and/or field missing.",
+                    env, os.getenv(env))
+                continue
+            section = elements[1]
+            field = '_'.join(elements[2:])
+            value = os.getenv(env)
+            if section not in self.conf:
+                self.conf[section] = {}
+            self.conf[section][field] = value
+
+    def get(self, section, field=None):
+        if not field:
+            return self.conf[section]
+        return self.conf[section][field]
+
+    def set(self, section, field, value):
+        if section not in self.conf:
+            self.conf[section] = {}
+        self.conf[section][field] = value