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fix(bedrock): guard _chunk_bytes_to_sse against None in stream decoder #1976

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fix(bedrock): guard _chunk_bytes_to_sse against None in stream decoder #1976

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bfe041a
fix(bedrock): guard _chunk_bytes_to_sse against None and non-bytes pa…
chauvuusvn Oct 5, 2026
02aa9a1
fix(bedrock): guard call-site against empty or missing bytes in strea…
chauvuusvn Oct 16, 2026
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6 changes: 5 additions & 1 deletion src/anthropic/lib/bedrock/_stream_decoder.py
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,11 @@ def _parse_message_from_event(self, event: EventStreamMessage) -> ServerSentEven
if not chunk:
return None

return _chunk_bytes_to_sse(chunk.get("bytes"))
raw = chunk.get("bytes")
if not raw:
return None

return _chunk_bytes_to_sse(raw)


def _chunk_bytes_to_sse(raw: bytes) -> ServerSentEvent | None:
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27 changes: 27 additions & 0 deletions tests/lib/test_bedrock.py
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Original file line number Diff line number Diff line change
Expand Up @@ -424,6 +424,33 @@ async def test_stream_skips_typeless_chunk_async(respx_mock: MockRouter) -> None
assert events[1].to_dict()["amazon-bedrock-invocationMetrics"] == _INVOCATION_METRICS


@pytest.mark.respx()
def test_stream_skips_empty_and_null_bytes_chunk(respx_mock: MockRouter) -> None:
body = (
_eventstream_chunk_frame(_TYPELESS_CHUNK_STREAM[0])
+ _eventstream_frame(
{":message-type": "event", ":event-type": "chunk", ":content-type": "application/json"},
b'{"bytes": ""}',
)
+ _eventstream_frame(
{":message-type": "event", ":event-type": "chunk", ":content-type": "application/json"},
b'{"bytes": null}',
)
+ _eventstream_chunk_frame(_TYPELESS_CHUNK_STREAM[2])
)
respx_mock.post(_STREAM_URL).mock(
return_value=httpx2.Response(
200, content=body, headers={"content-type": "application/vnd.amazon.eventstream"}
)
)
stream = sync_client.messages.create(
max_tokens=8, messages=[{"role": "user", "content": "hi"}], model="anthropic.claude-x", stream=True
)
events = list(stream)

assert [e.type for e in events] == ["message_start", "message_stop"]


_THROTTLING_MESSAGE = "Too many requests, please wait before trying again."
_EXCEPTION_FRAME = _eventstream_frame(
{":message-type": "exception", ":exception-type": "throttlingException", ":content-type": "application/json"},
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