preserve exc_info in logs dict

lite_bootstrap/instruments/logging_instrument.py

@@ -15,6 +15,7 @@
 if import_checker.is_structlog_installed:
     import orjson
     import structlog
+    from structlog.processors import ExceptionRenderer
 
 
 ScopeType = typing.MutableMapping[str, typing.Any]
@@ -96,6 +97,15 @@ class LoggingConfig(BaseConfig):
     )
 
 
+class CustomExceptionRenderer(ExceptionRenderer):
+    def __call__(self, logger: "WrappedLogger", name: str, event_dict: "EventDict") -> "EventDict":
+        exc_info = event_dict.get("exc_info")
+        event_dict = super().__call__(logger=logger, name=name, event_dict=event_dict)
+        if exc_info:
+            event_dict["exc_info"] = exc_info
+        return event_dict
+
+
 @dataclasses.dataclass(kw_only=True, slots=True, frozen=True)
 class LoggingInstrument(BaseInstrument):
     bootstrap_config: LoggingConfig
@@ -111,7 +121,7 @@ def structlog_pre_chain_processors(self) -> list[typing.Any]:
             structlog.stdlib.PositionalArgumentsFormatter(),
             structlog.processors.TimeStamper(fmt="%Y-%m-%d %H:%M:%S"),
             structlog.processors.StackInfoRenderer(),
-            structlog.processors.format_exc_info,
+            CustomExceptionRenderer(),
             structlog.processors.UnicodeDecoder(),
         ]
 

tests/instruments/test_logging_instrument.py

@@ -21,6 +21,11 @@ def test_logging_instrument_simple() -> None:
     try:
         logging_instrument.bootstrap()
         logger.info("testing structlog", key="value")
+        try:
+            msg = "some error"
+            raise ValueError(msg)  # noqa: TRY301
+        except ValueError:
+            logger.exception("logging error")
         std_logger.info("testing std logger", extra={"key": "value"})
     finally:
         logging_instrument.teardown()