dekun
279 lines
9.1 KiB
Python
279 lines
9.1 KiB
Python
"""随机任务下发与回传校验。
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节点不暴露回调地址时，任务留在待拉取队列，客户端用
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GET /api/v1/node/{sn}/tasks 领取。配置了 callback_url 时，调度器会额外 POST 一次。
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回传必须带上任务里的 nonce，避免未收到任务的客户端直接上报成功。
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"""
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from __future__ import annotations
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import hmac
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import json
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import logging
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import random
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import secrets
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import uuid
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from datetime import datetime, timedelta
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from urllib.error import URLError
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from urllib.request import Request, urlopen
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from sqlalchemy import select
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from sqlalchemy.orm import Session, selectinload
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from app.clock import utcnow
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from app.config import settings
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from app.errors import AppError
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from app.models import ComputeNode, ComputeTask, NodeStatus, PushStatus, TaskStatus
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from app.services.common import get_node_by_sn
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logger = logging.getLogger(__name__)
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ADMIN_TASK_TYPES = {
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"alpha_mining": "量化因子挖掘",
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"llm_inference": "大模型推理",
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"lora_training": "QLoRA 微调",
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"stress_test": "简易压测",
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}
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_BUSY = (TaskStatus.PENDING, TaskStatus.PROCESSING)
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def create_admin_tasks(
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session: Session,
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task_type: str,
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payload: dict | None,
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target_node_sn: str | None = None,
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now: datetime | None = None,
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) -> list[ComputeTask]:
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"""向指定节点或当前全部在线节点各放一条任务。payload 里补上一次性 nonce。"""
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if task_type not in ADMIN_TASK_TYPES:
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raise AppError("不支持的任务类型", 400)
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moment = now or utcnow()
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body = dict(payload or {})
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if len(json.dumps(body, ensure_ascii=False)) > 8000:
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raise AppError("任务参数过长", 400)
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targets = _dispatch_targets(session, target_node_sn, moment)
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deadline = moment + timedelta(minutes=settings.task_deadline_minutes)
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tasks: list[ComputeTask] = []
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for node in targets:
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task_payload = dict(body)
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task_payload["nonce"] = secrets.token_hex(16)
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task = ComputeTask(
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id=str(uuid.uuid4()),
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node_id=node.id,
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task_type=task_type,
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payload=task_payload,
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status=TaskStatus.PENDING,
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push_status=PushStatus.QUEUED,
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dispatched_at=moment,
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deadline_at=deadline,
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)
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session.add(task)
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tasks.append(task)
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session.flush()
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for node, task in zip(targets, tasks):
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_push_task(node, task)
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session.flush()
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return tasks
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def list_admin_tasks(session: Session) -> list[ComputeTask]:
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return list(
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session.scalars(
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select(ComputeTask)
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.options(selectinload(ComputeTask.node))
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.order_by(ComputeTask.dispatched_at.desc(), ComputeTask.id.desc())
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).all()
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)
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def result_preview(result: dict | None) -> str:
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if not result:
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return ""
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for key in ("formula", "alpha", "output", "summary"):
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value = result.get(key)
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if isinstance(value, str) and value.strip():
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return value.strip()[:120]
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for key in ("patch_bytes", "patch_size", "adapter_bytes"):
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if result.get(key) is not None:
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return f"补丁 {result[key]}"
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text = json.dumps(result, ensure_ascii=False)
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return text if len(text) <= 120 else text[:117] + "..."
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def _dispatch_targets(session: Session, target_node_sn: str | None, moment: datetime) -> list[ComputeNode]:
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sn = (target_node_sn or "").strip()
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if sn:
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node = get_node_by_sn(session, sn)
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if node.is_banned:
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raise AppError("节点已封禁，不能下发任务", 409)
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if node.license_expires_at <= moment:
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raise AppError("节点授权已到期，不能下发任务", 409)
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return [node]
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nodes = session.scalars(
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select(ComputeNode).where(
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ComputeNode.status == NodeStatus.ONLINE,
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ComputeNode.license_expires_at > moment,
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ComputeNode.is_banned.is_(False),
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)
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).all()
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if not nodes:
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raise AppError("当前没有可下发的在线节点", 409)
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return list(nodes)
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def dispatch_random_tasks(session: Session, now: datetime | None = None) -> list[ComputeTask]:
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"""向当前在线、授权仍有效、且没有未完成任务的节点随机下发一轮任务。"""
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moment = now or utcnow()
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expire_overdue_tasks(session, moment)
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pending_node_ids = set(
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session.scalars(select(ComputeTask.node_id).where(ComputeTask.status.in_(_BUSY))).all()
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)
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candidates = [
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node
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for node in session.scalars(
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select(ComputeNode).where(
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ComputeNode.status == NodeStatus.ONLINE,
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ComputeNode.license_expires_at > moment,
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)
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).all()
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if node.id not in pending_node_ids
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]
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if not candidates:
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return []
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batch = min(len(candidates), settings.dispatch_batch_size)
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chosen = random.sample(candidates, batch)
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deadline = moment + timedelta(minutes=settings.task_deadline_minutes)
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tasks: list[ComputeTask] = []
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for node in chosen:
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task = ComputeTask(
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id=str(uuid.uuid4()),
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node_id=node.id,
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task_type="simulated_compute",
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payload={
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"op": "simulated_compute",
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"nonce": secrets.token_hex(16),
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"seed": secrets.token_hex(8),
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},
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status=TaskStatus.PENDING,
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push_status=PushStatus.QUEUED,
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dispatched_at=moment,
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deadline_at=deadline,
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)
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session.add(task)
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tasks.append(task)
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session.flush()
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for node, task in zip(chosen, tasks):
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_push_task(node, task)
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session.flush()
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return tasks
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def list_pending_tasks(session: Session, sn: str, now: datetime | None = None) -> list[ComputeTask]:
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moment = now or utcnow()
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node = get_node_by_sn(session, sn.strip())
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tasks = session.scalars(
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select(ComputeTask)
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.where(ComputeTask.node_id == node.id, ComputeTask.status == TaskStatus.PENDING)
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.order_by(ComputeTask.dispatched_at)
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).all()
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visible: list[ComputeTask] = []
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for task in tasks:
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if task.deadline_at < moment:
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task.status = TaskStatus.EXPIRED
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continue
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task.status = TaskStatus.PROCESSING
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visible.append(task)
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session.flush()
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return visible
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def report_task(
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session: Session,
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sn: str,
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task_id: str,
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success: bool,
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nonce: str,
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now: datetime | None = None,
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result: dict | None = None,
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) -> ComputeTask:
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"""校验任务归属、时限和 nonce。只有校验通过且 success 为真才记为有效响应。"""
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moment = now or utcnow()
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node = get_node_by_sn(session, sn.strip())
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task = session.get(ComputeTask, task_id)
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if task is None:
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raise AppError("任务不存在", 404)
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if task.node_id != node.id:
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raise AppError("任务不属于该节点", 403)
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if task.status not in _BUSY:
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raise AppError("任务已结束，不能重复回传", 409)
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if task.deadline_at < moment:
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task.status = TaskStatus.EXPIRED
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session.flush()
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raise AppError("任务已超过回传时限", 409)
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expected = str((task.payload or {}).get("nonce", ""))
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if not _nonce_matches(nonce, expected):
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raise AppError("任务响应校验失败")
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task.responded_at = moment
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task.success = success
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task.result = result or None
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task.status = TaskStatus.COMPLETED if success else TaskStatus.FAILED
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session.flush()
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return task
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def expire_overdue_tasks(session: Session, now: datetime | None = None) -> int:
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moment = now or utcnow()
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tasks = session.scalars(
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select(ComputeTask).where(
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ComputeTask.status.in_(_BUSY),
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ComputeTask.deadline_at < moment,
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)
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).all()
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for task in tasks:
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task.status = TaskStatus.EXPIRED
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if tasks:
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session.flush()
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return len(tasks)
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def _nonce_matches(provided: str, expected: str) -> bool:
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if not expected or len(provided) != len(expected):
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return False
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return hmac.compare_digest(provided, expected)
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def _push_task(node: ComputeNode, task: ComputeTask) -> None:
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if not node.callback_url:
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task.push_status = PushStatus.QUEUED
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return
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body = json.dumps(
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{
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"task_id": task.id,
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"sn": node.sn,
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"task_type": task.task_type,
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"payload": task.payload,
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"deadline_at": task.deadline_at.isoformat(),
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}
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).encode()
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request = Request(
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node.callback_url,
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data=body,
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headers={"Content-Type": "application/json"},
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method="POST",
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)
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try:
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with urlopen(request, timeout=2) as response:
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if 200 <= response.status < 300:
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task.push_status = PushStatus.PUSHED
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task.push_error = None
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return
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task.push_status = PushStatus.FAILED
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task.push_error = f"HTTP {response.status}"
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except (URLError, TimeoutError, OSError) as exc:
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task.push_status = PushStatus.FAILED
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task.push_error = str(exc)[:255]
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logger.warning("task push failed sn=%s task=%s error=%s", node.sn, task.id, exc)
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