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Task Engine — Heart of the Autonomous Agent
Manages task lifecycle, planning, execution, self-healing
"""
import asyncio
import json
import os
import time
import uuid
from typing import Dict, Optional, List
import structlog
from core.models import TaskStatus, TaskPlan, TaskStep, TaskCreateRequest
from api.websocket_manager import WebSocketManager
from memory.db import (
create_task, update_task_status, get_task, save_task_event,
save_memory, get_task_events
)
log = structlog.get_logger()
MAX_RETRIES = 3
MAX_CONCURRENT = 5
class TaskEngine:
def __init__(self, ws_manager: WebSocketManager):
self.ws = ws_manager
self._queue: asyncio.Queue = asyncio.Queue()
self._active: Dict[str, asyncio.Task] = {}
self._running = False
self._workers: List[asyncio.Task] = []
async def start(self):
self._running = True
for i in range(MAX_CONCURRENT):
worker = asyncio.create_task(self._worker(i))
self._workers.append(worker)
log.info("TaskEngine started", workers=MAX_CONCURRENT)
async def stop(self):
self._running = False
for w in self._workers:
w.cancel()
log.info("TaskEngine stopped")
# ─── Public API ────────────────────────────────────────────────────────────
async def submit(self, req: TaskCreateRequest) -> str:
task_id = f"task_{uuid.uuid4().hex[:10]}"
await create_task(
task_id=task_id,
goal=req.goal,
session_id=req.session_id,
project_id=req.project_id,
metadata={**req.metadata, "github_repo": req.github_repo, "auto_commit": req.auto_commit},
)
await self.ws.emit(task_id, "task_created", {
"goal": req.goal,
"session_id": req.session_id,
"stream_url": f"/api/v1/tasks/{task_id}/stream",
"ws_url": f"/ws/tasks/{task_id}",
}, session_id=req.session_id)
await self._queue.put((task_id, req))
await self.ws.emit(task_id, "task_queued", {
"position": self._queue.qsize(),
}, session_id=req.session_id)
log.info("Task submitted", task_id=task_id, goal=req.goal[:60])
return task_id
async def cancel(self, task_id: str, reason: str = "User cancelled"):
if task_id in self._active:
self._active[task_id].cancel()
del self._active[task_id]
await update_task_status(task_id, "cancelled", error=reason)
await self.ws.emit(task_id, "task_failed", {"reason": reason, "status": "cancelled"})
async def retry(self, task_id: str):
task = await get_task(task_id)
if not task:
return
req = TaskCreateRequest(
goal=task["goal"],
session_id=task["session_id"] or "",
project_id=task["project_id"] or "",
metadata=task.get("metadata") or {},
)
retry_count = (task.get("retry_count") or 0) + 1
await update_task_status(task_id, "queued", retry_count=retry_count)
await self.ws.emit(task_id, "retry_attempt", {"count": retry_count})
await self._queue.put((task_id, req))
async def handle_chat_message(self, session_id: str, content: str, websocket=None):
"""Handle real-time chat message with streaming response."""
from core.agent import AgentCore
agent = AgentCore(self.ws)
await agent.stream_chat(session_id=session_id, user_message=content)
# ─── Worker Loop ───────────────────────────────────────────────────────────
async def _worker(self, worker_id: int):
log.info(f"Worker {worker_id} started")
while self._running:
try:
task_id, req = await asyncio.wait_for(self._queue.get(), timeout=1.0)
worker_task = asyncio.create_task(self._execute(task_id, req))
self._active[task_id] = worker_task
await worker_task
self._active.pop(task_id, None)
self._queue.task_done()
except asyncio.TimeoutError:
continue
except asyncio.CancelledError:
break
except Exception as e:
log.error(f"Worker {worker_id} error", error=str(e))
async def _execute(self, task_id: str, req: TaskCreateRequest):
"""Full task execution lifecycle."""
from core.agent import AgentCore
agent = AgentCore(self.ws)
try:
# ── Initializing ────────────────────────────────────────────────
await update_task_status(task_id, "initializing")
await self.ws.emit(task_id, "task_started", {
"goal": req.goal,
"status": "initializing",
}, session_id=req.session_id)
await save_task_event(task_id, "task_started", {"goal": req.goal})
# ── Planning ────────────────────────────────────────────────────
await update_task_status(task_id, "planning")
await self.ws.emit(task_id, "step_started", {
"step": "Planning",
"status": "planning",
"description": "Generating execution plan...",
}, session_id=req.session_id)
plan = await agent.plan(goal=req.goal, task_id=task_id, session_id=req.session_id)
await update_task_status(task_id, "executing", plan=plan.model_dump())
await self.ws.emit(task_id, "plan_generated", {
"steps": [s.model_dump() for s in plan.steps],
"estimated_duration": plan.estimated_duration,
"tools_needed": plan.tools_needed,
}, session_id=req.session_id)
await save_task_event(task_id, "plan_generated", {"steps_count": len(plan.steps)})
# ── Execute Steps ────────────────────────────────────────────────
results = []
for i, step in enumerate(plan.steps):
await self.ws.emit(task_id, "step_started", {
"step": step.name,
"step_id": step.id,
"index": i,
"total": len(plan.steps),
"tool": step.tool,
}, session_id=req.session_id)
step_result = await agent.execute_step(
step=step,
task_id=task_id,
session_id=req.session_id,
context={"goal": req.goal, "previous_results": results},
)
results.append(step_result)
await self.ws.emit(task_id, "step_completed", {
"step": step.name,
"step_id": step.id,
"index": i,
"output": step_result[:500] if isinstance(step_result, str) else str(step_result)[:500],
"status": "completed",
}, session_id=req.session_id)
await save_task_event(task_id, "step_completed", {"step": step.name, "index": i})
# ── Finalize ─────────────────────────────────────────────────────
await update_task_status(task_id, "finalizing")
await self.ws.emit(task_id, "step_started", {
"step": "Finalizing",
"description": "Compiling results...",
}, session_id=req.session_id)
final_result = await agent.finalize(
goal=req.goal,
steps=plan.steps,
results=results,
task_id=task_id,
session_id=req.session_id,
)
await update_task_status(task_id, "completed", result=final_result)
await self.ws.emit(task_id, "task_completed", {
"result": final_result,
"steps_completed": len(plan.steps),
"duration": time.time(),
}, session_id=req.session_id)
# Save to memory
await save_memory(
content=f"Task: {req.goal}\nResult: {final_result}",
memory_type="task",
session_id=req.session_id,
project_id=req.project_id,
key=task_id,
)
await self.ws.emit(task_id, "memory_updated", {
"type": "task",
"key": task_id,
}, session_id=req.session_id)
log.info("Task completed", task_id=task_id)
except asyncio.CancelledError:
await update_task_status(task_id, "cancelled")
await self.ws.emit(task_id, "task_failed", {"reason": "cancelled"})
except Exception as e:
log.error("Task failed", task_id=task_id, error=str(e))
task_data = await get_task(task_id)
retry_count = (task_data or {}).get("retry_count", 0)
await self.ws.emit(task_id, "error", {
"error": str(e),
"retry_count": retry_count,
"will_retry": retry_count < MAX_RETRIES,
}, session_id=req.session_id)
if retry_count < MAX_RETRIES:
await update_task_status(task_id, "retrying", retry_count=retry_count + 1)
await asyncio.sleep(2 ** retry_count)
await self.ws.emit(task_id, "retry_attempt", {"count": retry_count + 1})
await self._execute(task_id, req)
else:
await update_task_status(task_id, "failed", error=str(e))
await self.ws.emit(task_id, "task_failed", {
"error": str(e),
"retry_count": retry_count,
}, session_id=req.session_id)
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