fix: remove unreachable streaming error branch

src/openai/_streaming.py

@@ -63,21 +63,6 @@ def __stream__(self) -> Iterator[_T]:
                 # we have to special case the Assistants `thread.` events since we won't have an "event" key in the data
                 if sse.event and sse.event.startswith("thread."):
                     data = sse.json()
-
-                    if sse.event == "error" and is_mapping(data) and data.get("error"):
-                        message = None
-                        error = data.get("error")
-                        if is_mapping(error):
-                            message = error.get("message")
-                        if not message or not isinstance(message, str):
-                            message = "An error occurred during streaming"
-
-                        raise APIError(
-                            message=message,
-                            request=self.response.request,
-                            body=data["error"],
-                        )
-
                     yield process_data(data={"data": data, "event": sse.event}, cast_to=cast_to, response=response)
                 else:
                     data = sse.json()
@@ -166,21 +151,6 @@ async def __stream__(self) -> AsyncIterator[_T]:
                 # we have to special case the Assistants `thread.` events since we won't have an "event" key in the data
                 if sse.event and sse.event.startswith("thread."):
                     data = sse.json()
-
-                    if sse.event == "error" and is_mapping(data) and data.get("error"):
-                        message = None
-                        error = data.get("error")
-                        if is_mapping(error):
-                            message = error.get("message")
-                        if not message or not isinstance(message, str):
-                            message = "An error occurred during streaming"
-
-                        raise APIError(
-                            message=message,
-                            request=self.response.request,
-                            body=data["error"],
-                        )
-
                     yield process_data(data={"data": data, "event": sse.event}, cast_to=cast_to, response=response)
                 else:
                     data = sse.json()

tests/test_streaming.py

@@ -7,6 +7,7 @@
 
 from openai import OpenAI, AsyncOpenAI
 from openai._streaming import Stream, AsyncStream, ServerSentEvent
+from openai._exceptions import APIError
 
 
 @pytest.mark.asyncio
@@ -104,6 +105,37 @@ def body() -> Iterator[bytes]:
     await assert_empty_iter(iterator)
 
 
+@pytest.mark.asyncio
+@pytest.mark.parametrize("sync", [True, False], ids=["sync", "async"])
+async def test_thread_events_keep_event_wrapper(sync: bool, client: OpenAI, async_client: AsyncOpenAI) -> None:
+    def body() -> Iterator[bytes]:
+        yield b"event: thread.message.delta\n"
+        yield b'data: {"id":"msg_123","delta":{"content":[]}}\n'
+        yield b"\n"
+
+    stream = make_stream(content=body(), sync=sync, client=client, async_client=async_client)
+
+    assert await iter_next(stream) == {
+        "data": {"id": "msg_123", "delta": {"content": []}},
+        "event": "thread.message.delta",
+    }
+    await assert_empty_iter(stream)
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("sync", [True, False], ids=["sync", "async"])
+async def test_error_events_raise_api_error(sync: bool, client: OpenAI, async_client: AsyncOpenAI) -> None:
+    def body() -> Iterator[bytes]:
+        yield b"event: error\n"
+        yield b'data: {"error":{"message":"boom"}}\n'
+        yield b"\n"
+
+    stream = make_stream(content=body(), sync=sync, client=client, async_client=async_client)
+
+    with pytest.raises(APIError, match="boom"):
+        await iter_next(stream)
+
+
 @pytest.mark.asyncio
 @pytest.mark.parametrize("sync", [True, False], ids=["sync", "async"])
 async def test_multiple_data_lines_with_empty_line(sync: bool, client: OpenAI, async_client: AsyncOpenAI) -> None:
@@ -240,9 +272,22 @@ def make_event_iterator(
     client: OpenAI,
     async_client: AsyncOpenAI,
 ) -> Iterator[ServerSentEvent] | AsyncIterator[ServerSentEvent]:
+    response = httpx.Response(200, content=content if sync else to_aiter(content), request=httpx.Request("GET", "https://example.com"))
+    if sync:
+        return Stream(cast_to=object, client=client, response=response)._iter_events()
+
+    return AsyncStream(cast_to=object, client=async_client, response=response)._iter_events()
+
+
+def make_stream(
+    content: Iterator[bytes],
+    *,
+    sync: bool,
+    client: OpenAI,
+    async_client: AsyncOpenAI,
+) -> Iterator[object] | AsyncIterator[object]:
+    response = httpx.Response(200, content=content if sync else to_aiter(content), request=httpx.Request("GET", "https://example.com"))
     if sync:
-        return Stream(cast_to=object, client=client, response=httpx.Response(200, content=content))._iter_events()
+        return iter(Stream(cast_to=object, client=client, response=response))
 
-    return AsyncStream(
-        cast_to=object, client=async_client, response=httpx.Response(200, content=to_aiter(content))
-    )._iter_events()
+    return AsyncStream(cast_to=object, client=async_client, response=response).__stream__()