baodan/api/insurance/generation/task_service.py

"""统一任务服务：创建、查询、取消任务。"""
import json
import logging
import uuid
from datetime import datetime

logger = logging.getLogger(__name__)


def create_task(user_id: str, artifact_type: str, operation: str,
                workspace_id: str, title: str = "",
                input_snapshot: dict = None, idempotency_key: str = None) -> dict:
    """创建生成任务并提交到 Celery。

    返回 {"code": 0, "data": task_dict} 或错误。
    """
    from insurance.db.compat import db
    from insurance.models.generation_task import GenerationTask

    # 幂等检查
    if idempotency_key:
        existing = GenerationTask.query.filter_by(
            idempotency_key=idempotency_key,
        ).filter(GenerationTask.status.in_(["queued", "running", "done"])).first()
        if existing:
            return {"code": 0, "data": existing.to_dict(), "message": "任务已存在"}

    # 检查同一工作区是否有运行中的任务
    active = GenerationTask.query.filter_by(
        workspace_id=workspace_id,
    ).filter(GenerationTask.status.in_(["queued", "running"])).first()
    if active:
        return {"code": 1001, "message": "该工作区有正在执行的任务，请等待完成", "data": None}

    task = GenerationTask(
        id=uuid.uuid4().hex,
        user_id=user_id,
        artifact_type=artifact_type,
        operation=operation,
        workspace_id=workspace_id,
        title_snapshot=title,
        input_snapshot_json=json.dumps(input_snapshot, ensure_ascii=False) if input_snapshot else None,
        idempotency_key=idempotency_key,
    )
    db.session.add(task)
    db.session.commit()

    # 提交到 Celery
    _dispatch_to_celery(task)

    return {"code": 0, "data": task.to_dict()}


def _dispatch_to_celery(task):
    """根据任务类型分发到对应的 Celery 任务。"""
    from insurance.generation.celery_tasks import (
        parse_ppt_task, generate_ppt_task,
        parse_poster_task, generate_poster_task,
    )

    task_map = {
        ("ppt", "parse"): parse_ppt_task,
        ("ppt", "generate"): generate_ppt_task,
        ("poster", "parse"): parse_poster_task,
        ("poster", "generate"): generate_poster_task,
    }

    celery_task_fn = task_map.get((task.artifact_type, task.operation))
    if not celery_task_fn:
        logger.error(f"未知任务类型: {task.artifact_type}/{task.operation}")
        task.status = "failed"
        task.error_code = "unknown_type"
        task.error_message = f"未知任务类型: {task.artifact_type}/{task.operation}"
        from insurance.db.compat import db
        db.session.commit()
        return

    result = celery_task_fn.delay(task.id)
    task.celery_task_id = result.id
    from insurance.db.compat import db
    db.session.commit()
    logger.info(f"任务 {task.id} 已提交到 Celery: {result.id}")


def list_active_tasks(user_id: str, artifact_type: str = None) -> list:
    """查询用户活跃任务（任务坞用）。"""
    from insurance.models.generation_task import GenerationTask

    query = GenerationTask.query.filter_by(user_id=user_id)
    query = query.filter(GenerationTask.dock_hidden_at.is_(None))
    if artifact_type:
        query = query.filter_by(artifact_type=artifact_type)

    # 只返回活跃和最近完成的任务
    query = query.filter(
        GenerationTask.status.in_(["queued", "running", "done", "failed"])
    )
    query = query.order_by(GenerationTask.created_at.desc())
    tasks = query.limit(20).all()
    return [t.to_dict() for t in tasks]


def list_tasks(user_id: str, artifact_type: str = None,
               status: str = None, page: int = 1, page_size: int = 20) -> dict:
    """查询任务列表（任务中心用）。"""
    from insurance.models.generation_task import GenerationTask

    query = GenerationTask.query.filter_by(user_id=user_id)
    if artifact_type:
        query = query.filter_by(artifact_type=artifact_type)
    if status:
        query = query.filter_by(status=status)
    query = query.order_by(GenerationTask.created_at.desc())

    total = query.count()
    items = query.offset((page - 1) * page_size).limit(page_size).all()
    return {
        "total": total,
        "items": [t.to_dict() for t in items],
    }


def get_task(task_id: str, user_id: str) -> dict:
    """获取任务详情。"""
    from insurance.models.generation_task import GenerationTask

    task = GenerationTask.query.get(task_id)
    if not task or task.user_id != user_id:
        return {"code": 1002, "message": "任务不存在", "data": None}
    return {"code": 0, "data": task.to_dict()}


def cancel_task(task_id: str, user_id: str) -> dict:
    """取消排队中的任务。"""
    from insurance.db.compat import db
    from insurance.models.generation_task import GenerationTask

    task = GenerationTask.query.get(task_id)
    if not task or task.user_id != user_id:
        return {"code": 1002, "message": "任务不存在", "data": None}
    if task.status != "queued":
        return {"code": 1001, "message": "只能取消排队中的任务", "data": None}

    task.status = "cancelled"
    task.finished_at = datetime.now()
    db.session.commit()

    return {"code": 0, "data": task.to_dict()}


def hide_task_from_dock(task_id: str, user_id: str) -> dict:
    """从任务坞隐藏任务。"""
    from insurance.db.compat import db
    from insurance.models.generation_task import GenerationTask

    task = GenerationTask.query.get(task_id)
    if not task or task.user_id != user_id:
        return {"code": 1002, "message": "任务不存在", "data": None}

    task.dock_hidden_at = datetime.now()
    db.session.commit()
    return {"code": 0, "data": task.to_dict()}


# ─── 过期任务恢复 ──────────────────────────────────────────

STALE_TASK_TIMEOUT = 600  # 10 分钟无心跳视为过期


def recover_stale_tasks():
    """启动时恢复过期任务：将长时间无心跳的 running 任务标记为 failed。

    应在应用启动时调用。
    """
    from insurance.db.compat import db
    from insurance.models.generation_task import GenerationTask

    cutoff = datetime.now().timestamp() - STALE_TASK_TIMEOUT

    # 恢复无心跳的 running 任务
    stale_running = GenerationTask.query.filter(
        GenerationTask.status == "running",
        GenerationTask.heartbeat_at < datetime.fromtimestamp(cutoff),
    ).all()
    for task in stale_running:
        task.status = "failed"
        task.error_code = "stale"
        task.error_message = "任务因服务重启而中断，请重新提交"
        task.finished_at = datetime.now()
        logger.warning(f"恢复过期任务: {task.id} (workspace={task.workspace_id})")

    # 恢复长时间 queued 的任务（可能 Celery 未消费）
    stale_queued = GenerationTask.query.filter(
        GenerationTask.status == "queued",
        GenerationTask.created_at < datetime.fromtimestamp(cutoff),
    ).all()
    for task in stale_queued:
        task.status = "failed"
        task.error_code = "queue_timeout"
        task.error_message = "任务排队超时，请重新提交"
        task.finished_at = datetime.now()
        logger.warning(f"恢复排队超时任务: {task.id}")

    if stale_running or stale_queued:
        db.session.commit()
        logger.info(f"已恢复 {len(stale_running)} 个运行过期任务, {len(stale_queued)} 个排队超时任务")