v0.10.0

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "danom"
-version = "0.9.0"
+version = "0.10.0"
 description = "Functional streams and monads"
 readme = "README.md"
 license = "MIT"

src/danom/_result.py

@@ -12,6 +12,7 @@
 )
 
 import attrs
+from attrs.validators import instance_of
 
 T_co = TypeVar("T_co", covariant=True)
 U_co = TypeVar("U_co", covariant=True)
@@ -181,7 +182,10 @@ def unwrap(self) -> T_co:
 @attrs.define(frozen=True)
 class Err(Result):
     error: Any = attrs.field(default=None)
-    input_args: tuple[()] | SafeArgs | SafeMethodArgs = attrs.field(default=(), repr=False)
+    input_args: tuple[()] | SafeArgs | SafeMethodArgs = attrs.field(
+        default=(), validator=instance_of(tuple), repr=False
+    )
+    traceback: str = attrs.field(default="", validator=instance_of(str))
     details: list[dict[str, Any]] = attrs.field(factory=list, init=False, repr=False)
 
     def __attrs_post_init__(self) -> None:

src/danom/_safe.py

@@ -1,4 +1,5 @@
 import functools
+import traceback
 from collections.abc import Callable
 from typing import ParamSpec
 
@@ -26,7 +27,7 @@ def wrapper(*args: P.args, **kwargs: P.kwargs) -> Result[U, E]:
         try:
             return Ok(func(*args, **kwargs))
         except Exception as e:  # noqa: BLE001
-            return Err(input_args=(args, kwargs), error=e)
+            return Err(error=e, input_args=(args, kwargs), traceback=traceback.format_exc())
 
     return wrapper
 
@@ -54,6 +55,6 @@ def wrapper(self, *args: P.args, **kwargs: P.kwargs) -> Result[U, E]:  # noqa: A
         try:
             return Ok(func(self, *args, **kwargs))
         except Exception as e:  # noqa: BLE001
-            return Err(input_args=(self, args, kwargs), error=e)
+            return Err(error=e, input_args=(self, args, kwargs), traceback=traceback.format_exc())
 
     return wrapper

tests/conftest.py

@@ -3,7 +3,7 @@
 import asyncio
 from multiprocessing.managers import ListProxy
 from pathlib import Path
-from typing import Any, Self
+from typing import Any, Never, Self
 
 from src.danom import safe, safe_method
 from src.danom._result import Err, Ok, Result
@@ -80,6 +80,11 @@ def safe_get_error_type(exception: Exception) -> str:
     return exception.__class__.__name__
 
 
+@safe
+def div_zero(x: int) -> Never:
+    return x / 0
+
+
 class Adder:
     def __init__(self) -> None:
         self.result = 0

tests/test_safe.py

@@ -2,7 +2,14 @@
 
 import pytest
 
-from tests.conftest import Adder, safe_add, safe_get_error_type, safe_raise_type_error
+from tests.conftest import (
+    REPO_ROOT,
+    Adder,
+    div_zero,
+    safe_add,
+    safe_get_error_type,
+    safe_raise_type_error,
+)
 
 
 def test_valid_safe_pipeline():
@@ -50,3 +57,14 @@ def test_invalid_safe_method_pipeline():
     assert not res.is_ok()
     with pytest.raises(ValueError):
         res.unwrap()
+
+
+def test_traceback():
+    err = div_zero()
+    assert err.traceback.replace(str(REPO_ROOT), ".").splitlines() == [
+        "Traceback (most recent call last):",
+        '  File "./src/danom/_safe.py", line 28, in wrapper',
+        "    return Ok(func(*args, **kwargs))",
+        "              ^^^^^^^^^^^^^^^^^^^^^",
+        "TypeError: div_zero() missing 1 required positional argument: 'x'",
+    ]