fix: Infinite recursion when capturing event during serialization (#470)

* fix: Infinite recursion when capturing event during serialization

* fix: Actually have "working" repr

* fix: Add original test

Author: untitaker

sentry_sdk/client.py

@@ -31,6 +31,7 @@
 
 
 _client_init_debug = ContextVar("client_init_debug")
+_client_in_capture_event = ContextVar("client_in_capture_event")
 
 
 def _get_options(*args, **kwargs):
@@ -240,20 +241,29 @@ def capture_event(
 
         :returns: An event ID. May be `None` if there is no DSN set or of if the SDK decided to discard the event for other reasons. In such situations setting `debug=True` on `init()` may help.
         """
-        if self.transport is None:
+        is_recursive = _client_in_capture_event.get(False)
+        if is_recursive:
             return None
-        if hint is None:
-            hint = {}
-        rv = event.get("event_id")
-        if rv is None:
-            event["event_id"] = rv = uuid.uuid4().hex
-        if not self._should_capture(event, hint, scope):
-            return None
-        event = self._prepare_event(event, hint, scope)
-        if event is None:
-            return None
-        self.transport.capture_event(event)
-        return rv
+
+        _client_in_capture_event.set(True)
+
+        try:
+            if self.transport is None:
+                return None
+            if hint is None:
+                hint = {}
+            event_id = event.get("event_id")
+            if event_id is None:
+                event["event_id"] = event_id = uuid.uuid4().hex
+            if not self._should_capture(event, hint, scope):
+                return None
+            event_opt = self._prepare_event(event, hint, scope)
+            if event_opt is None:
+                return None
+            self.transport.capture_event(event_opt)
+            return event_id
+        finally:
+            _client_in_capture_event.set(False)
 
     def close(
         self,

tests/test_client.py

@@ -560,6 +560,68 @@ def __repr__(self):
     )
 
 
+def test_mapping_sends_exception(sentry_init, capture_events):
+    sentry_init()
+    events = capture_events()
+
+    class C(Mapping):
+        def __iter__(self):
+            try:
+                1 / 0
+            except ZeroDivisionError:
+                capture_exception()
+            yield "hi"
+
+        def __len__(self):
+            """List length"""
+            return 1
+
+        def __getitem__(self, ii):
+            """Get a list item"""
+            if ii == "hi":
+                return "hi"
+
+            raise KeyError()
+
+    try:
+        a = C()  # noqa
+        1 / 0
+    except Exception:
+        capture_exception()
+
+    event, = events
+
+    assert event["exception"]["values"][0]["stacktrace"]["frames"][0]["vars"]["a"] == {
+        "hi": "'hi'"
+    }
+
+
+def test_object_sends_exception(sentry_init, capture_events):
+    sentry_init()
+    events = capture_events()
+
+    class C(object):
+        def __repr__(self):
+            try:
+                1 / 0
+            except ZeroDivisionError:
+                capture_exception()
+            return "hi, i am a repr"
+
+    try:
+        a = C()  # noqa
+        1 / 0
+    except Exception:
+        capture_exception()
+
+    event, = events
+
+    assert (
+        event["exception"]["values"][0]["stacktrace"]["frames"][0]["vars"]["a"]
+        == "hi, i am a repr"
+    )
+
+
 def test_errno_errors(sentry_init, capture_events):
     sentry_init()
     events = capture_events()