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fix: import ResponsesStreamEvent and DRY up SSE formatting (#1499)

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## Summary
- `ResponsesStreamEvent` was defined in `openai_responses.py` as a union
of all 11 streaming event types but never imported or used anywhere in
the codebase
- Import it in the responses adapter and add a `_format_sse(event:
ResponsesStreamEvent) -> str` helper
- Replace 13 hardcoded `f"event: {type}\ndata:
{event.model_dump_json()}\n\n"` strings with `_format_sse()` calls

## Test plan
- [x] `uv run basedpyright` — 0 errors
- [x] `uv run ruff check` — all checks passed
- [x] `nix fmt` — 0 files changed
- [x] `uv run pytest` — 188 passed, 1 skipped

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Alex Cheema
2026-02-19 05:40:24 -08:00
committed by GitHub
parent 2e29605194
commit aa3f106fb9
1 changed files with 19 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/exo/master/adapters/responses.py
+19 -13
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@@ -31,6 +31,7 @@ from exo.shared.types.openai_responses import (
ResponseOutputText,
ResponsesRequest,
ResponsesResponse,
ResponsesStreamEvent,
ResponseTextDeltaEvent,
ResponseTextDoneEvent,
ResponseUsage,
@@ -38,6 +39,11 @@ from exo.shared.types.openai_responses import (
from exo.shared.types.text_generation import InputMessage, TextGenerationTaskParams
def _format_sse(event: ResponsesStreamEvent) -> str:
"""Format a streaming event as an SSE message."""
return f"event: {event.type}\ndata: {event.model_dump_json()}\n\n"
def _extract_content(content: str | list[ResponseContentPart]) -> str:
"""Extract plain text from a content field that may be a string or list of parts."""
if isinstance(content, str):
@@ -219,13 +225,13 @@ async def generate_responses_stream(
created_event = ResponseCreatedEvent(
sequence_number=next(seq), response=initial_response
)
yield f"event: response.created\ndata: {created_event.model_dump_json()}\n\n"
yield _format_sse(created_event)
# response.in_progress
in_progress_event = ResponseInProgressEvent(
sequence_number=next(seq), response=initial_response
)
yield f"event: response.in_progress\ndata: {in_progress_event.model_dump_json()}\n\n"
yield _format_sse(in_progress_event)
# response.output_item.added
initial_item = ResponseMessageItem(
@@ -236,7 +242,7 @@ async def generate_responses_stream(
item_added = ResponseOutputItemAddedEvent(
sequence_number=next(seq), output_index=0, item=initial_item
)
yield f"event: response.output_item.added\ndata: {item_added.model_dump_json()}\n\n"
yield _format_sse(item_added)
# response.content_part.added
initial_part = ResponseOutputText(text="")
@@ -247,7 +253,7 @@ async def generate_responses_stream(
content_index=0,
part=initial_part,
)
yield f"event: response.content_part.added\ndata: {part_added.model_dump_json()}\n\n"
yield _format_sse(part_added)
accumulated_text = ""
function_call_items: list[ResponseFunctionCallItem] = []
@@ -281,7 +287,7 @@ async def generate_responses_stream(
output_index=next_output_index,
item=fc_item,
)
yield f"event: response.output_item.added\ndata: {fc_added.model_dump_json()}\n\n"
yield _format_sse(fc_added)
# response.function_call_arguments.delta
args_delta = ResponseFunctionCallArgumentsDeltaEvent(
@@ -290,7 +296,7 @@ async def generate_responses_stream(
output_index=next_output_index,
delta=tool.arguments,
)
yield f"event: response.function_call_arguments.delta\ndata: {args_delta.model_dump_json()}\n\n"
yield _format_sse(args_delta)
# response.function_call_arguments.done
args_done = ResponseFunctionCallArgumentsDoneEvent(
@@ -300,7 +306,7 @@ async def generate_responses_stream(
name=tool.name,
arguments=tool.arguments,
)
yield f"event: response.function_call_arguments.done\ndata: {args_done.model_dump_json()}\n\n"
yield _format_sse(args_done)
# response.output_item.done
fc_done_item = ResponseFunctionCallItem(
@@ -315,7 +321,7 @@ async def generate_responses_stream(
output_index=next_output_index,
item=fc_done_item,
)
yield f"event: response.output_item.done\ndata: {fc_item_done.model_dump_json()}\n\n"
yield _format_sse(fc_item_done)
function_call_items.append(fc_done_item)
next_output_index += 1
@@ -331,7 +337,7 @@ async def generate_responses_stream(
content_index=0,
delta=chunk.text,
)
yield f"event: response.output_text.delta\ndata: {delta_event.model_dump_json()}\n\n"
yield _format_sse(delta_event)
# response.output_text.done
text_done = ResponseTextDoneEvent(
@@ -341,7 +347,7 @@ async def generate_responses_stream(
content_index=0,
text=accumulated_text,
)
yield f"event: response.output_text.done\ndata: {text_done.model_dump_json()}\n\n"
yield _format_sse(text_done)
# response.content_part.done
final_part = ResponseOutputText(text=accumulated_text)
@@ -352,7 +358,7 @@ async def generate_responses_stream(
content_index=0,
part=final_part,
)
yield f"event: response.content_part.done\ndata: {part_done.model_dump_json()}\n\n"
yield _format_sse(part_done)
# response.output_item.done
final_message_item = ResponseMessageItem(
@@ -363,7 +369,7 @@ async def generate_responses_stream(
item_done = ResponseOutputItemDoneEvent(
sequence_number=next(seq), output_index=0, item=final_message_item
)
yield f"event: response.output_item.done\ndata: {item_done.model_dump_json()}\n\n"
yield _format_sse(item_done)
# Create usage from usage data if available
usage = None
@@ -388,4 +394,4 @@ async def generate_responses_stream(
completed_event = ResponseCompletedEvent(
sequence_number=next(seq), response=final_response
)
yield f"event: response.completed\ndata: {completed_event.model_dump_json()}\n\n"
yield _format_sse(completed_event)