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fix: SSE event parsing — use message.part.delta + correct session.status format

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marauder-actual
2026-05-29 18:26:31 +02:00
parent d2638e0650
commit fa018f380c
1 changed files with 24 additions and 25 deletions
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app/main.py
+23 -24
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@@ -286,13 +286,16 @@ async def _stream_opencode(
"""Send a message to opencode and stream the response via SSE.
1. POST /session/:id/prompt_async — fire the prompt (returns 204 immediately)
2. GET /event (SSE) — stream message.part.updated events with text deltas
2. GET /event (SSE) — stream message.part.delta events with text tokens
The SSE stream emits events for ALL sessions. We filter by our session ID
and track the assistant message parts to extract text deltas.
The SSE stream emits events for ALL sessions. We filter by our session ID.
Event types we care about:
message.part.delta — incremental text token (props.delta)
session.status — props.status.type == "idle" means agent finished
session.idle — agent finished (belt-and-suspenders)
"""
full_response = ""
prev_text = "" # track cumulative text to compute deltas
try:
async with httpx.AsyncClient(timeout=5.0) as fire_client:
@@ -312,8 +315,8 @@ async def _stream_opencode(
if resp.status_code not in (200, 204):
raise RuntimeError(f"prompt_async HTTP {resp.status_code}: {resp.text[:200]}")
# Now stream SSE events until the assistant message is done
async with httpx.AsyncClient(timeout=180.0) as sse_client:
# Stream SSE events until the agent goes idle (max 120s)
async with httpx.AsyncClient(timeout=httpx.Timeout(connect=10.0, read=120.0, write=5.0, pool=5.0)) as sse_client:
async with sse_client.stream(
"GET",
f"{OPENCODE_URL}/event",
@@ -342,28 +345,24 @@ async def _stream_opencode(
if props.get("sessionID") != session_id:
continue
# message.part.updated — contains text deltas
if evt_type == "message.part.updated":
part = props.get("part", {})
if part.get("type") == "text":
new_text = part.get("text", "")
if len(new_text) > len(prev_text):
delta = new_text[len(prev_text):]
prev_text = new_text
full_response = new_text
# message.part.delta — real-time text token
if evt_type == "message.part.delta":
if props.get("field") == "text":
delta = props.get("delta", "")
if delta:
full_response += delta
await ws.send_json({"role": "assistant", "delta": delta, "done": False})
# message.updated with role=assistant + completed status = done
if evt_type == "message.updated":
msg = props.get("message", props)
role = msg.get("role", "")
status = msg.get("status", "")
if role == "assistant" and status in ("completed", "done", "error"):
# session.status — status is an object {"type": "idle"|"busy"}
elif evt_type == "session.status":
status = props.get("status", {})
if isinstance(status, dict) and status.get("type") == "idle":
break
elif status == "idle":
break
# session status idle = agent finished
if evt_type == "session.status":
if props.get("status") == "idle":
# session.idle — direct idle signal
elif evt_type == "session.idle":
break
except Exception as e: