NeteaseUrl/web/routers/tasks.py

# -*- coding: utf-8 -*-
"""任务状态端点（FastAPI 栈）——与 Flask 侧同名端点响应契约逐字段对齐。

已迁移：
- POST/GET /api/v1/topen          ↔ Flask /api/topen（请求统计，无鉴权）
- POST/GET /api/v1/queue          ↔ Flask /api/queue（排队状态，无鉴权）
- POST/GET /api/v1/batch_progress ↔ Flask /api/batch_progress（需登录，仅本人任务）
- POST     /api/v1/task/cancel    ↔ Flask /api/task/cancel（需登录，仅本人任务）
- POST/GET /api/v1/task/heartbeat ↔ Flask /api/task/heartbeat（需登录）
- POST/GET /api/v1/task/list      ↔ Flask /api/task/list（需登录）

这些端点读写 core.state 的共享任务表（与 Flask 同一批对象），因此两栈在迁移期
看到的是同一份任务状态——这是「单进程双框架」能成立的关键。
"""
import time
from typing import Annotated, Any

from fastapi import APIRouter, Depends, Request

from core.state import (
    BATCH_DURATIONS,
    BATCH_DURATIONS_LOCK,
    DEVICE_LAST_SEEN,
    DEVICE_LAST_SEEN_LOCK,
    DOWNLOAD_TASKS,
    DOWNLOAD_TASKS_LOCK,
    REQUEST_STATS,
    STATS_LOCK,
)
from web import ratelimit
from web.deps import SiteUser, require_login
from web.request_utils import (
    request_data as _request_data,
)
from web.response import error, success

router = APIRouter()

LoginUser = Annotated[SiteUser, Depends(require_login)]



def _touch_device(device_id: str) -> None:
    """记录设备心跳（与 Flask _touch_device 同口径，共享 DEVICE_LAST_SEEN）。"""
    device_id = str(device_id or '')[:64]
    if not device_id:
        return
    with DEVICE_LAST_SEEN_LOCK:
        if len(DEVICE_LAST_SEEN) >= 5000:
            for d in sorted(DEVICE_LAST_SEEN, key=lambda k: DEVICE_LAST_SEEN.get(k, 0.0))[:2500]:
                DEVICE_LAST_SEEN.pop(d, None)
        DEVICE_LAST_SEEN[device_id] = time.time()


def _owned_by(task: dict[str, Any], user: SiteUser) -> bool:
    return int(task.get('user_id') or 0) == int(user.id)


def _semaphores():
    """批量打包/下载信号量（Flask 侧对象，懒取以共享同一计数）。"""
    import services.runtime as services
    return services.BATCH_ZIP_SEM, services.api_service.downloader._download_semaphore


@router.api_route('/api/topen', methods=['GET', 'POST'])
async def topen(request: Request):
    """接口请求统计（实时）——锁内快照，避免 total 与明细不一致。"""
    import services.runtime as services
    with STATS_LOCK:
        snapshot = {p: dict(v) for p, v in REQUEST_STATS.items()}
    endpoints = []
    total = sum(v['count'] for v in snapshot.values())
    for path, info in snapshot.items():
        endpoints.append({
            'path': path,
            'name': services.ENDPOINT_NAMES.get(path, path),
            'count': info['count'],
            'percent': round(info['count'] / total * 100, 1) if total else 0,
            'last': info['last'],
        })
    endpoints.sort(key=lambda x: x['count'], reverse=True)
    return success({
        'total': total,
        'endpoint_count': len(endpoints),
        'max_count': endpoints[0]['count'] if endpoints else 0,
        'endpoints': endpoints,
    }, '获取请求统计成功')


@router.api_route('/api/queue', methods=['GET', 'POST'])
async def queue(request: Request):
    """实时排队状态（排队人数 + 预计等待时间）。"""
    batch_sem, dl_sem = _semaphores()
    avg_batch = None
    with BATCH_DURATIONS_LOCK:
        if BATCH_DURATIONS:
            avg_batch = sum(BATCH_DURATIONS) / len(BATCH_DURATIONS)
    return success({
        'batch_capacity': batch_sem.capacity,
        'batch_active': batch_sem.active,
        'batch_waiting': batch_sem.waiting,
        'download_capacity': dl_sem.capacity,
        'download_active': dl_sem.active,
        'download_waiting': dl_sem.waiting,
        'avg_batch_seconds': round(avg_batch, 1) if avg_batch else None,
    }, '获取排队状态成功')


@router.api_route('/api/batch_progress', methods=['GET', 'POST'])
async def batch_progress(user: LoginUser, request: Request):
    """下载任务进度（已处理 X/Y + 百分比 + 预计剩余时间）。"""
    data = await _request_data(request)
    task_id = str(data.get('task_id') or '').strip()
    if not task_id:
        return error('缺少 task_id 参数')
    now = time.time()
    with DOWNLOAD_TASKS_LOCK:
        task = DOWNLOAD_TASKS.get(task_id)
    if not task:
        return error('任务不存在或已过期', 404)
    if not _owned_by(task, user):
        return error('无权查询该任务', 403)

    total = task.get('total', 0)
    done = task.get('done', 0)
    live = task.get('live_percent')
    if task.get('status') == 'running' and isinstance(live, (int, float)):
        percent = round(min(99.0, max(0.0, float(live))), 1)
    elif total:
        percent = round(done / total * 100, 1)
    else:
        percent = 100.0 if task.get('status') in ('done',) else 0.0
    elapsed = now - task.get('start', now)
    eta = None
    if task.get('status') == 'running' and done > 0 and elapsed > 0 and total:
        rate = done / elapsed
        if rate > 0:
            eta = round((total - done) / rate, 1)
    result = task.get('result') or {}
    has_result = bool(result.get('zip_path') or result.get('file_path'))
    return success({
        'total': total,
        'done': done,
        'failed': task.get('failed', 0),
        'percent': percent,
        'status': task.get('status', 'running'),
        'elapsed': round(elapsed, 1),
        'eta': eta,
        'msg': task.get('msg', ''),
        'refunded': task.get('refunded', 0),
        'has_result': has_result,
    }, '获取任务进度成功')


@router.post('/api/task/cancel')
async def task_cancel(user: LoginUser, request: Request):
    """取消下载任务（仅任务本人的站点账号可取消）。"""
    data = await _request_data(request)
    task_id = str(data.get('task_id') or '').strip()
    if not task_id:
        return error('缺少 task_id 参数')
    with DOWNLOAD_TASKS_LOCK:
        task = DOWNLOAD_TASKS.get(task_id)
        if not task:
            return error('任务不存在或已过期', 404)
        if not _owned_by(task, user):
            return error('无权取消该任务', 403)
        if task.get('status') in ('done', 'error', 'canceled'):
            return error(f"任务已结束（{task.get('status')}）", 400)
        task['status'] = 'canceled'
        task['msg'] = '任务已取消'
        task['completed_at'] = time.time()
        task['cancel'].set()
    return success({'task_id': task_id, 'status': 'canceled'}, '已请求取消')


@router.api_route('/api/task/heartbeat', methods=['GET', 'POST'])
async def task_heartbeat(user: LoginUser, request: Request):
    """设备心跳：保持任务活跃；暂停中的任务自动恢复（重新进入排队）。"""
    await ratelimit.guard(request, bucket='hb', limit=60, window=60)
    data = await _request_data(request)
    device_id = str(data.get('device_id') or '').strip()[:64]
    if not device_id:
        return error('缺少 device_id 参数')
    _touch_device(device_id)
    resumed = 0
    with DOWNLOAD_TASKS_LOCK:
        for task in DOWNLOAD_TASKS.values():
            if (task.get('device_id') == device_id
                    and int(task.get('user_id') or 0) == int(user.id)
                    and task.get('status') == 'paused'):
                task['status'] = 'queued'
                task['msg'] = '恢复中...'
                task['pause'].clear()
                resumed += 1
    now = time.time()
    with DEVICE_LAST_SEEN_LOCK:
        stale = [d for d, ts in DEVICE_LAST_SEEN.items() if now - ts > 86400]
        for d in stale:
            DEVICE_LAST_SEEN.pop(d, None)
    return success({'resumed': resumed, 'online': True}, '心跳成功')


@router.api_route('/api/task/list', methods=['GET', 'POST'])
async def task_list(user: LoginUser, request: Request):
    """本设备未结束的任务列表（重新打开网站时恢复任务悬浮窗）。"""
    data = await _request_data(request)
    device_id = str(data.get('device_id') or '').strip()[:64]
    if not device_id:
        return error('缺少 device_id 参数')
    _touch_device(device_id)
    my_tasks = []
    with DOWNLOAD_TASKS_LOCK:
        for tid, task in DOWNLOAD_TASKS.items():
            params = task.get('params') or {}
            if (task.get('device_id') == device_id
                    and int(task.get('user_id') or 0) == int(user.id)
                    and task.get('status') in ('queued', 'running', 'paused')):
                my_tasks.append({
                    'task_id': tid,
                    'type': task.get('type', 'batch'),
                    'kind': ('podcast' if ('program_id' in params
                                           or 'radio_name' in params
                                           or params.get('radio_id'))
                             else 'music'),
                    'total': task.get('total', 0),
                    'done': task.get('done', 0),
                    'status': task.get('status', 'queued'),
                    'msg': task.get('msg', ''),
                })
    return success({'tasks': my_tasks}, '获取任务列表成功')