| """Flatten / unflatten helpers shared by all backends.""" |
|
|
| import json |
| import logging |
| from typing import Any |
|
|
| _log = logging.getLogger(__name__) |
|
|
|
|
| def flatten(nested: dict[str, Any], prefix: str = "") -> dict[str, str]: |
| """Recursively flatten *nested* to ``{"section.key": json_value, ...}``.""" |
| out: dict[str, str] = {} |
| for k, v in nested.items(): |
| full = f"{prefix}.{k}" if prefix else k |
| if isinstance(v, dict): |
| out.update(flatten(v, full)) |
| else: |
| out[full] = json.dumps(v, ensure_ascii=False) |
| return out |
|
|
|
|
| def unflatten(flat: dict[str, str]) -> dict[str, Any]: |
| """Rebuild a nested dict from ``{"section.key": json_value, ...}``.""" |
| result: dict[str, Any] = {} |
| for dotted, json_val in flat.items(): |
| parts = dotted.split(".") |
| node = result |
| for part in parts[:-1]: |
| node = node.setdefault(part, {}) |
| try: |
| node[parts[-1]] = json.loads(json_val) |
| except (json.JSONDecodeError, ValueError): |
| _log.warning("config: failed to deserialize key %r, treating as string", dotted) |
| node[parts[-1]] = json_val |
| return result |
|
|
