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Task API Routes — CRUD + Streaming + WebSocket
"""
import asyncio
import json
import time
from typing import Optional
from fastapi import APIRouter, HTTPException, Request, Query
from fastapi.responses import StreamingResponse
from core.models import (
TaskCreateRequest, TaskCancelRequest, TaskRetryRequest, TaskResponse, TaskStatus
)
from memory.db import get_task, list_tasks, get_task_events, update_task_status
router = APIRouter()
def get_engine(request: Request):
return request.app.state.task_engine
def get_ws(request: Request):
return request.app.state.ws_manager
# ─── Create Task ───────────────────────────────────────────────────────────────
@router.post("/create", summary="Create & queue a new agent task")
async def create_task(req: TaskCreateRequest, request: Request):
engine = get_engine(request)
task_id = await engine.submit(req)
task = await get_task(task_id)
return {
"task_id": task_id,
"status": "queued",
"goal": req.goal,
"session_id": req.session_id,
"stream_url": f"/api/v1/tasks/{task_id}/stream",
"ws_url": f"/ws/tasks/{task_id}",
"created_at": task["created_at"] if task else time.time(),
}
# ─── Get Task ──────────────────────────────────────────────────────────────────
@router.get("/{task_id}", summary="Get task details")
async def get_task_detail(task_id: str):
task = await get_task(task_id)
if not task:
raise HTTPException(status_code=404, detail=f"Task {task_id} not found")
return task
# ─── Get Task Status ───────────────────────────────────────────────────────────
@router.get("/{task_id}/status", summary="Get task status only")
async def get_task_status(task_id: str):
task = await get_task(task_id)
if not task:
raise HTTPException(status_code=404, detail=f"Task {task_id} not found")
return {
"task_id": task_id,
"status": task["status"],
"retry_count": task.get("retry_count", 0),
"created_at": task.get("created_at"),
"started_at": task.get("started_at"),
"completed_at": task.get("completed_at"),
}
# ─── Cancel Task ───────────────────────────────────────────────────────────────
@router.post("/{task_id}/cancel", summary="Cancel a running task")
async def cancel_task(task_id: str, req: TaskCancelRequest, request: Request):
task = await get_task(task_id)
if not task:
raise HTTPException(status_code=404, detail=f"Task {task_id} not found")
if task["status"] in ("completed", "failed", "cancelled"):
raise HTTPException(status_code=400, detail=f"Task already {task['status']}")
engine = get_engine(request)
await engine.cancel(task_id, req.reason)
return {"task_id": task_id, "status": "cancelled", "reason": req.reason}
# ─── Retry Task ────────────────────────────────────────────────────────────────
@router.post("/{task_id}/retry", summary="Retry a failed task")
async def retry_task(task_id: str, request: Request):
task = await get_task(task_id)
if not task:
raise HTTPException(status_code=404, detail=f"Task {task_id} not found")
if task["status"] not in ("failed", "cancelled"):
raise HTTPException(status_code=400, detail="Only failed/cancelled tasks can be retried")
engine = get_engine(request)
await engine.retry(task_id)
return {"task_id": task_id, "status": "queued", "message": "Task requeued for retry"}
# ─── Stream Task Events (SSE) ──────────────────────────────────────────────────
@router.get("/{task_id}/stream", summary="Stream task events via SSE")
async def stream_task(task_id: str, request: Request):
task = await get_task(task_id)
if not task:
raise HTTPException(status_code=404, detail=f"Task {task_id} not found")
async def event_generator():
# First, replay all stored events
events = await get_task_events(task_id)
for ev in events:
data = json.dumps({
"type": ev["event_type"],
"task_id": task_id,
"timestamp": ev["timestamp"],
"data": json.loads(ev["data"]) if ev.get("data") else {},
})
yield f"data: {data}\n\n"
# Then stream live events via WS manager buffer
ws = get_ws(request)
room = f"task:{task_id}"
last_count = len(events)
# Poll for new events (for SSE fallback)
for _ in range(600): # max 5 minutes
await asyncio.sleep(0.5)
current_task = await get_task(task_id)
if current_task and current_task["status"] in ("completed", "failed", "cancelled"):
yield f"data: {json.dumps({'type': 'stream_end', 'task_id': task_id, 'status': current_task['status']})}\n\n"
break
# heartbeat
yield f"data: {json.dumps({'type': 'heartbeat', 'timestamp': time.time()})}\n\n"
return StreamingResponse(
event_generator(),
media_type="text/event-stream",
headers={
"Cache-Control": "no-cache",
"X-Accel-Buffering": "no",
"Connection": "keep-alive",
},
)
# ─── List Tasks ────────────────────────────────────────────────────────────────
@router.get("/", summary="List tasks")
async def list_all_tasks(
session_id: str = Query(default=""),
limit: int = Query(default=50, le=200),
):
tasks = await list_tasks(session_id=session_id, limit=limit)
return {"tasks": tasks, "total": len(tasks)}
# ─── Task Events History ───────────────────────────────────────────────────────
@router.get("/{task_id}/events", summary="Get all events for a task")
async def task_events(task_id: str):
task = await get_task(task_id)
if not task:
raise HTTPException(status_code=404, detail=f"Task {task_id} not found")
events = await get_task_events(task_id)
return {"task_id": task_id, "events": events, "total": len(events)}
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