fix: Do not raise from None

scripts/find_raise_from_none.py

@@ -42,17 +42,11 @@ def main():
     for module_path in walk_package_modules():
         scan_file(module_path)
 
-    # TODO: Investigate why we suppress exception chains here.
-    ignored_raises = {
-        pathlib.Path("sentry_sdk/integrations/asgi.py"): 2,
-        pathlib.Path("sentry_sdk/integrations/asyncio.py"): 1,
-    }
-
     raise_from_none_count = {
         file: len(occurences)
         for file, occurences in RaiseFromNoneVisitor.line_numbers.items()
     }
-    if raise_from_none_count != ignored_raises:
+    if raise_from_none_count:
         exc = Exception("Detected unexpected raise ... from None.")
         exc.add_note(
             "Raise ... from None suppresses chained exceptions, removing valuable context."

sentry_sdk/integrations/asgi.py

@@ -4,6 +4,7 @@
 Based on Tom Christie's `sentry-asgi <https://github.com/encode/sentry-asgi>`.
 """
 
+import sys
 import asyncio
 import inspect
 from copy import deepcopy
@@ -37,6 +38,8 @@
     logger,
     transaction_from_function,
     _get_installed_modules,
+    capture_internal_exceptions,
+    reraise,
 )
 
 from typing import TYPE_CHECKING
@@ -187,8 +190,10 @@ async def _run_app(
                     return await self.app(scope, receive, send)
 
             except Exception as exc:
-                self._capture_lifespan_exception(exc)
-                raise exc from None
+                exc_info = sys.exc_info()
+                with capture_internal_exceptions():
+                    self._capture_lifespan_exception(exc)
+                reraise(*exc_info)
 
         client = sentry_sdk.get_client()
         span_streaming = has_span_streaming_enabled(client.options)
@@ -323,8 +328,10 @@ async def _sentry_wrapped_send(
                                     scope, receive, _sentry_wrapped_send
                                 )
                         except Exception as exc:
-                            self._capture_request_exception(exc)
-                            raise exc from None
+                            exc_info = sys.exc_info()
+                            with capture_internal_exceptions():
+                                self._capture_request_exception(exc)
+                            reraise(*exc_info)
         finally:
             _asgi_middleware_applied.set(False)
 

sentry_sdk/integrations/asyncio.py

@@ -78,8 +78,8 @@ async def _task_with_sentry_span_creation() -> "Any":
                     ):
                         try:
                             result = await coro
-                        except StopAsyncIteration as e:
-                            raise e from None
+                        except StopAsyncIteration:
+                            raise
                         except Exception:
                             reraise(*_capture_exception())