feat: allow custom logger name for slot exception handler

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Feat: Support custom logger names for `log_if_fails` decorator
+
 ## [0.4.1] - 2024-2-1
 
 - Fix: Fix submodule usage detection when installed as an embedded dependency

tools/decorations.py

@@ -3,35 +3,48 @@
 __email__ = "[email protected]"
 __revision__ = "$Format:%H$"
 
-from typing import Any, Callable
+from typing import Any, Callable, Optional
 
 from .exceptions import QgsPluginException
 from .i18n import tr
-from .messages import MsgBar
+from .messages import MessageBarLogger
 from .tasks import FunctionTask
 
 
-def log_if_fails(fn: Callable) -> Callable:
+def log_if_fails(
+    fn: Optional[Callable] = None, /, *, logger_name: str = __name__
+) -> Callable:
     """
     Use this as a decorator with functions and methods that
     might throw uncaught exceptions.
     """
     from functools import wraps
 
-    @wraps(fn)
-    def wrapper(*args: Any, **kwargs: Any) -> None:  # noqa: ANN001
-        try:
-            # Qt injects False into some signals
-            if args[1:] != (False,):
-                fn(*args, **kwargs)
-            else:
-                fn(*args[:-1], **kwargs)
-        except QgsPluginException as e:
-            MsgBar.exception(e, **e.bar_msg, stack_info=True)
-        except Exception as e:
-            MsgBar.exception(tr("Unhandled exception occurred"), e, stack_info=True)
-
-    return wrapper
+    # caller is at depth 3 (MessageBarLogger log call, this function, actual call)
+    message_bar = MessageBarLogger(logger_name, stack_level=3)
+
+    def decorator(fn: Callable) -> Callable:
+        @wraps(fn)
+        def wrapper(*args: Any, **kwargs: Any) -> None:  # noqa: ANN001
+            try:
+                # Qt injects False into some signals
+                if args[1:] != (False,):
+                    fn(*args, **kwargs)
+                else:
+                    fn(*args[:-1], **kwargs)
+            except QgsPluginException as e:
+                message_bar.exception(e, **e.bar_msg, stack_info=True)
+            except Exception as e:
+                message_bar.exception(
+                    tr("Unhandled exception occurred"), e, stack_info=True
+                )
+
+        return wrapper
+
+    if fn is None:
+        return decorator
+
+    return decorator(fn)
 
 
 def taskify(fn: Callable) -> Callable:

tools/messages.py

@@ -13,12 +13,12 @@ class MessageBarLogger:
     Setup with a logger name that has a message bar set.
     """
 
-    def __init__(self, logger_name: str) -> None:
+    def __init__(self, logger_name: str, stack_level: int = 2) -> None:
         self._logger = logging.getLogger(logger_name)
         self._logger_kwargs: Dict[str, Any] = (
             {}
             if sys.version_info.major == 3 and sys.version_info.minor < 8
-            else {"stacklevel": 2}
+            else {"stacklevel": stack_level}
         )
 
     def info(
@@ -148,10 +148,16 @@ def exception(
         :param exc_info: Exception of handled exception for capturing traceback
         :param stack_info: Whether to include stack info
         """
-        self._logger.exception(
+        # for some reason using logger.exception will essentially have extra stack level
+        # even though its not visible on the printed stack (possibly due to exception
+        # being a simple helper which calls error internally). use plain error here to
+        # have same effective stacklevel on both actual log records. possibly related
+        # https://github.com/python/cpython/issues/89334 has been fixed in 3.11+
+        self._logger.error(
             str(message),
             extra=bar_msg(details, duration, success),
             stack_info=stack_info,
+            exc_info=True,
             **self._logger_kwargs,
         )
         if details != "":