[pull] main from hynek:main

.pre-commit-config.yaml

@@ -4,7 +4,7 @@ ci:
 
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.8.1
+    rev: v0.8.5
     hooks:
       - id: ruff
         args: [--fix, --exit-non-zero-on-fix]

CHANGELOG.md

@@ -43,6 +43,10 @@ You can find our backwards-compatibility policy [here](https://github.com/hynek/
 
   [#677](https://github.com/hynek/structlog/pull/677)
 
+- `structlog.tracebacks.ExceptionDictTransformer` now actually accepts `None` for `locals_max_length` and `locals_max_string`.
+
+  [#675](https://github.com/hynek/structlog/pull/675)
+
 
 ## [24.4.0](https://github.com/hynek/structlog/compare/24.3.0...24.4.0) - 2024-07-17
 

src/structlog/tracebacks.py

@@ -368,6 +368,10 @@ class ExceptionDictTransformer:
     .. versionchanged:: 24.3.0
        Added *locals_max_length*, *locals_hide_sunder*, *locals_hide_dunder*,
        *suppress* and *use_rich* arguments.
+
+    .. versionchanged:: 25.1.0
+       *locals_max_length* and *locals_max_string* may be None to disable
+       truncation.
     """
 
     def __init__(
@@ -382,10 +386,10 @@ def __init__(
         max_frames: int = MAX_FRAMES,
         use_rich: bool = True,
     ) -> None:
-        if locals_max_length < 0:
+        if locals_max_length is not None and locals_max_length < 0:
             msg = f'"locals_max_length" must be >= 0: {locals_max_length}'
             raise ValueError(msg)
-        if locals_max_string < 0:
+        if locals_max_string is not None and locals_max_string < 0:
             msg = f'"locals_max_string" must be >= 0: {locals_max_string}'
             raise ValueError(msg)
         if max_frames < 2:

tests/test_tracebacks.py

@@ -531,6 +531,46 @@ def bar(n):
     ]
 
 
+@pytest.mark.parametrize(
+    ("kwargs", "local_variable"),
+    [
+        (
+            {"locals_max_string": None},
+            "x" * (tracebacks.LOCALS_MAX_STRING + 10),
+        ),
+        (
+            {"locals_max_length": None},
+            list(range(tracebacks.LOCALS_MAX_LENGTH + 10)),
+        ),
+    ],
+)
+def test_exception_dict_transformer_locals_max_accept_none_argument(
+    kwargs, local_variable
+):
+    """
+    ExceptionDictTransformer works when either locals_max_string or
+    locals_max_length is set to None.
+    """
+
+    try:
+        my_local = local_variable
+        1 / 0
+    except Exception as e:
+        format_json = tracebacks.ExceptionDictTransformer(
+            show_locals=True, **kwargs
+        )
+        result = format_json((type(e), e, e.__traceback__))
+
+    _ = my_local
+
+    assert len(result) == 1
+    assert len(result[0]["frames"]) == 1
+
+    frame = result[0]["frames"][0]
+
+    assert frame["locals"]["my_local"].strip("'") == str(local_variable)
+
+
 def test_json_traceback():
     """
     Tracebacks are formatted to JSON with all information.