postgres version

server/reloader.py

@@ -0,0 +1,49 @@
+import importlib
+import os
+import threading
+import importlib.util
+
+from __init__ import app
+
+
+_config_mtime = None
+_reload_lock = threading.RLock()
+
+if "CONFIG" in os.environ:
+    config_path = os.environ["CONFIG"]
+else:
+    config_path = os.path.join(app.root_path, 'config.py')
+
+config_spec = importlib.util.spec_from_file_location("server.config", config_path)
+config_module = importlib.util.module_from_spec(config_spec)
+config_spec.loader.exec_module(config_module)
+_cur_config = config_module.CONFIG
+
+
+def get_config():
+    """
+    Returns CONFIG dictionary from config.py module.
+
+    If config.py file was updated since the last call, get_config() reloads
+    the dictionary. If an error happens during reloading, get_config() returns
+    the old dictionary.
+
+    :returns: the newest valid version of the CONFIG dictionary
+    """
+
+    global _config_mtime, _cur_config
+
+    cur_mtime = os.stat(config_path).st_mtime_ns
+    if cur_mtime != _config_mtime:
+        with _reload_lock:
+            if cur_mtime != _config_mtime:
+                try:
+                    config_spec.loader.exec_module(config_module)
+                    _cur_config = config_module.CONFIG
+                    app.logger.info('New config loaded')
+                except Exception as e:
+                    app.logger.error('Failed to reload config: %s', e)
+
+                _config_mtime = cur_mtime
+
+    return _cur_config