common logging.yaml

kvmd/application.py

@@ -1,10 +1,15 @@
+import os
 import argparse
 import logging
 import logging.config
 
 from typing import Dict
+from typing import IO
+from typing import Any
 
 import yaml
+import yaml.loader
+import yaml.nodes
 
 
 # =====
@@ -13,10 +18,32 @@ def init() -> Dict:
     parser.add_argument("-c", "--config", required=True, metavar="<path>")
     options = parser.parse_args()
 
-    with open(options.config) as config_file:
-        config = yaml.load(config_file)
+    config: Dict = _load_yaml_file(options.config)
 
     logging.captureWarnings(True)
     logging.config.dictConfig(config["logging"])
 
-    return config["kvmd"]
+    return config
+
+
+# =====
+def _load_yaml_file(path: str) -> Any:
+    with open(path) as yaml_file:
+        try:
+            return yaml.load(yaml_file, _YamlLoader)
+        except Exception:
+            # Reraise internal exception as standard ValueError and show the incorrect file
+            raise ValueError("Incorrect YAML syntax in file '{}'".format(path))
+
+
+class _YamlLoader(yaml.loader.Loader):  # pylint: disable=too-many-ancestors
+    def __init__(self, yaml_file: IO) -> None:
+        yaml.loader.Loader.__init__(self, yaml_file)
+        self.__root = os.path.dirname(yaml_file.name)
+
+    def include(self, node: yaml.nodes.Node) -> str:
+        path = os.path.join(self.__root, self.construct_scalar(node))  # pylint: disable=no-member
+        return _load_yaml_file(path)
+
+
+_YamlLoader.add_constructor("!include", _YamlLoader.include)  # pylint: disable=no-member

kvmd/apps/cleanup/__init__.py

@@ -10,7 +10,7 @@ from ... import gpio
 
 # =====
 def main() -> None:
-    config = init()
+    config = init()["kvmd"]
     logger = get_logger(0)
 
     logger.info("Cleaning up ...")

kvmd/apps/kvmd/__init__.py

@@ -17,7 +17,7 @@ from .server import Server
 
 # =====
 def main() -> None:
-    config = init()
+    config = init()["kvmd"]
     with gpio.bcm():
         loop = asyncio.get_event_loop()
         http_session = aiohttp.ClientSession(loop=loop)