Baseline modular DNS sync

dns_sync/registry.py

@@ -0,0 +1,30 @@
+import importlib
+
+
+def _load(kind: str, name: str, config):
+    if not name or not name.replace("_", "").replace("-", "").isalnum():
+        raise RuntimeError(f"Invalid {kind} plugin name: {name!r}")
+
+    module_name = name.replace("-", "_")
+    path = f"dns_sync.plugins.{kind}.{module_name}"
+
+    try:
+        module = importlib.import_module(path)
+    except ModuleNotFoundError as exc:
+        if exc.name == path:
+            raise RuntimeError(f"Unknown {kind[:-1]} plugin: {name}") from exc
+        raise
+
+    plugin_class = getattr(module, "Plugin", None)
+    if plugin_class is None:
+        raise RuntimeError(f"Plugin module {path} does not export Plugin")
+
+    return plugin_class(config)
+
+
+def load_source(name: str, config):
+    return _load("sources", name, config)
+
+
+def load_provider(name: str, config):
+    return _load("providers", name, config)