merge_config loses nested settings
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| Agent | Cost | Cache read | Cache write | Input | Output |
|---|---|---|---|---|---|
| planner | $0.0006 | 5,720 | 778 | 8 | 982 |
| coder | $0.0066 | 45,494 | 19,437 | 30 | 7,329 |
| tester | $0.0070 | 68,100 | 22,072 | 36 | 7,132 |
| reviewer | $0.0008 | 1,727 | 3,199 | 4 | 747 |
Timeline
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planner iteration 1 Finished 3 calls · 7,488 tokens · $0.0006 · 6.9s
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coder iteration 1 Finished 4 calls · 20.6K tokens · $0.0018 · 13.4s
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tester iteration 1 Finished 4 calls · 26.0K tokens · $0.0018 · 16.2s
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verify iteration 1 Failed 0.5s
.......F [100%] =================================== FAILURES =================================== _____________ test_non_copyable_values_in_base_do_not_break_merge ______________ def test_non_copyable_values_in_base_do_not_break_merge(): lock = threading.Lock() base = {"handle": lock, "db": {"host": "a"}} > result = merge_config(base, {"db": {"port": 2}}) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ test_settings.py:57: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ settings.py:10: in merge_config result = copy.deepcopy(base) ^^^^^^^^^^^^^^^^^^^ /usr/local/lib/python3.12/copy.py:136: in deepcopy y = copier(x, memo) ^^^^^^^^^^^^^^^ /usr/local/lib/python3.12/copy.py:221: in _deepcopy_dict y[deepcopy(key, memo)] = deepcopy(value, memo) ^^^^^^^^^^^^^^^^^^^^^ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ x = <unlocked _thread.lock object at 0x7039f3042e00> memo = {123394192613376: {}}, _nil = [] def deepcopy(x, memo=None, _nil=[]): """Deep copy operation on arbitrary Python objects. See the module's __doc__ string for more info. """ if memo is None: memo = {} d = id(x) y = memo.get(d, _nil) if y is not _nil: return y cls = type(x) copier = _deepcopy_dispatch.get(cls) if copier is not None: y = copier(x, memo) else: if issubclass(cls, type): y = _deepcopy_atomic(x, memo) else: copier = getattr(x, "__deepcopy__", None) if copier is not None: y = copier(memo) else: reductor = dispatch_table.get(cls) if reductor: rv = reductor(x) else: reductor = getattr(x, "__reduce_ex__", None) if reductor is not None: > rv = reductor(4) ^^^^^^^^^^^ E TypeError: cannot pickle '_thread.lock' object /usr/local/lib/python3.12/copy.py:151: TypeError =========================== short test summary info ============================ FAILED test_settings.py::test_non_copyable_values_in_base_do_not_break_merge 1 failed, 7 passed in 0.05s -
coder iteration 2 Finished 3 calls · 20.7K tokens · $0.0013 · 9.3s
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tester iteration 2 Finished 3 calls · 19.3K tokens · $0.0016 · 11.7s
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verify iteration 2 Failed 0.6s
........F.. [100%] =================================== FAILURES =================================== ________________ test_untouched_nested_base_subtree_not_aliased ________________ def test_untouched_nested_base_subtree_not_aliased(): base = {"db": {"host": "a"}, "cache": {"ttl": 5}} result = merge_config(base, {"db": {"port": 2}}) result["cache"]["ttl"] = 99 > assert base["cache"]["ttl"] == 5 E assert 99 == 5 test_settings.py:66: AssertionError =========================== short test summary info ============================ FAILED test_settings.py::test_untouched_nested_base_subtree_not_aliased - ass... 1 failed, 10 passed in 0.06s -
coder iteration 3 Finished 2 calls · 13.7K tokens · $0.0015 · 10.6s
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tester iteration 3 Finished 4 calls · 30.7K tokens · $0.0022 · 18.8s
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verify iteration 3 Failed 0.6s
...........FF [100%] =================================== FAILURES =================================== _____________________ test_base_list_not_aliased_in_result _____________________ def test_base_list_not_aliased_in_result(): base = {"x": [1], "db": {"host": "a"}} result = merge_config(base, {"db": {"port": 2}}) result["x"].append(2) > assert base == {"x": [1], "db": {"host": "a"}} E AssertionError: assert {'x': [1, 2],...{'host': 'a'}} == {'x': [1], 'd...{'host': 'a'}} E E Omitting 1 identical items, use -vv to show E Differing items: E {'x': [1, 2]} != {'x': [1]} E Use -v to get more diff test_settings.py:87: AssertionError _________________ test_non_copyable_override_value_is_accepted _________________ def test_non_copyable_override_value_is_accepted(): lock = threading.Lock() > result = merge_config({}, {"handle": lock}) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ test_settings.py:92: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ settings.py:23: in merge_config result[key] = copy.deepcopy(value) ^^^^^^^^^^^^^^^^^^^^ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ x = <unlocked _thread.lock object at 0x7ec892bd7740>, memo = {}, _nil = [] def deepcopy(x, memo=None, _nil=[]): """Deep copy operation on arbitrary Python objects. See the module's __doc__ string for more info. """ if memo is None: memo = {} d = id(x) y = memo.get(d, _nil) if y is not _nil: return y cls = type(x) copier = _deepcopy_dispatch.get(cls) if copier is not None: y = copier(x, memo) else: if issubclass(cls, type): y = _deepcopy_atomic(x, memo) else: copier = getattr(x, "__deepcopy__", None) if copier is not None: y = copier(memo) else: reductor = dispatch_table.get(cls) if reductor: rv = reductor(x) else: reductor = getattr(x, "__reduce_ex__", None) if reductor is not None: > rv = reductor(4) ^^^^^^^^^^^ E TypeError: cannot pickle '_thread.lock' object /usr/local/lib/python3.12/copy.py:151: TypeError =========================== short test summary info ============================ FAILED test_settings.py::test_base_list_not_aliased_in_result - AssertionErro... FAILED test_settings.py::test_non_copyable_override_value_is_accepted - TypeE... 2 failed, 11 passed in 0.07s -
coder iteration 4 Finished 2 calls · 17.3K tokens · $0.0020 · 10.4s
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tester iteration 4 Finished 3 calls · 21.3K tokens · $0.0015 · 9.8s
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verify iteration 4 Passed 0.5s
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reviewer iteration 4 Finished 1 calls · 5,677 tokens · $0.0008 · 4.2s
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Final diff
diff --git a/settings.py b/settings.py index 8b119fb..e951a35 100644 --- a/settings.py +++ b/settings.py @@ -1,2 +1,29 @@ +def _copy_containers(value): + """Copy dict, list and tuple structure so the result never aliases them. + + Other objects are passed through unchanged, so values that cannot be + deep-copied (such as locks) are still accepted. + """ + if isinstance(value, dict): + return {k: _copy_containers(v) for k, v in value.items()} + if isinstance(value, list): + return [_copy_containers(v) for v in value] + if isinstance(value, tuple): + return tuple(_copy_containers(v) for v in value) + return value + + def merge_config(base: dict, override: dict) -> dict: - return {**base, **override} + """Return a new dict with override merged recursively into base. + + Nested dicts present in both are merged; any other override value + replaces the base value at the same key. Neither input is modified, + and the result shares no mutable containers with either input. + """ + result = {k: _copy_containers(v) for k, v in base.items()} + for key, value in override.items(): + if isinstance(base.get(key), dict) and isinstance(value, dict): + result[key] = merge_config(base[key], value) + else: + result[key] = _copy_containers(value) + return result diff --git a/test_settings.py b/test_settings.py index 52bc84b..9828f4e 100644 --- a/test_settings.py +++ b/test_settings.py @@ -1,3 +1,6 @@ +import copy +import threading + from settings import merge_config @@ -7,3 +10,84 @@ def test_flat_merge(): def test_override_wins(): assert merge_config({"a": 1}, {"a": 2}) == {"a": 2} + + +def test_nested_merge_keeps_base_keys(): + base = {"db": {"host": "a", "port": 1}} + override = {"db": {"port": 2}} + assert merge_config(base, override) == {"db": {"host": "a", "port": 2}} + + +def test_deep_nested_merge_three_levels(): + base = {"a": {"b": {"c": 1, "d": 2}, "e": 3}} + override = {"a": {"b": {"d": 4}}} + assert merge_config(base, override) == {"a": {"b": {"c": 1, "d": 4}, "e": 3}} + + +def test_non_dict_override_replaces_dict_base(): + base = {"db": {"host": "a"}} + assert merge_config(base, {"db": None}) == {"db": None} + assert merge_config(base, {"db": [1, 2]}) == {"db": [1, 2]} + assert merge_config(base, {"db": "x"}) == {"db": "x"} + + +def test_dict_override_replaces_non_dict_base(): + base = {"db": 5} + assert merge_config(base, {"db": {"host": "a"}}) == {"db": {"host": "a"}} + + +def test_inputs_not_mutated_and_result_not_aliased(): + base = {"db": {"host": "a", "port": 1}, "x": [1]} + override = {"db": {"port": 2, "opts": {"ssl": True}}} + base_copy = copy.deepcopy(base) + override_copy = copy.deepcopy(override) + + result = merge_config(base, override) + + assert base == base_copy + assert override == override_copy + assert result is not base + assert result["db"] is not base["db"] + assert result["db"]["opts"] is not override["db"]["opts"] + + +def test_non_copyable_values_in_base_do_not_break_merge(): + lock = threading.Lock() + base = {"handle": lock, "db": {"host": "a"}} + result = merge_config(base, {"db": {"port": 2}}) + assert result["handle"] is lock + assert result["db"] == {"host": "a", "port": 2} + + +def test_untouched_nested_base_subtree_not_aliased(): + base = {"db": {"host": "a"}, "cache": {"ttl": 5}} + result = merge_config(base, {"db": {"port": 2}}) + result["cache"]["ttl"] = 99 + assert base["cache"]["ttl"] == 5 + + +def test_override_list_not_aliased(): + override = {"tags": ["x"]} + result = merge_config({}, override) + result["tags"].append("y") + assert override == {"tags": ["x"]} + + +def test_dict_override_for_missing_key_is_copied(): + override = {"db": {"host": "a"}} + result = merge_config({}, override) + assert result == {"db": {"host": "a"}} + assert result["db"] is not override["db"] + + +def test_base_list_not_aliased_in_result(): + base = {"x": [1], "db": {"host": "a"}} + result = merge_config(base, {"db": {"port": 2}}) + result["x"].append(2) + assert base == {"x": [1], "db": {"host": "a"}} + + +def test_non_copyable_override_value_is_accepted(): + lock = threading.Lock() + result = merge_config({}, {"handle": lock}) + assert result["handle"] is lock