Archived
snowy-yang
a05af4a880
为什么：_podcast_stream_download 是播客单集下载的**唯一落盘路径**（单集 worker 与整台打包的首集都走它），却零测试覆盖；而且它把三段互不相关的职责——全局名额 排队、流式写盘与进度上报、完整性校验与坏文件清理——叠在 try/with/with/for 加四层 if 里，最大嵌套 10 层，是全仓最深的一个。 改法：拆成四个具名函数，主函数只留编排。 _stream_to_part ：拿响应 → 写 .part → 按 0.5s 节流上报进度，返回 (已写, 期望) _report_progress ：把一次进度写进任务表（含单集任务的 live_percent） _verify_downloaded ：完整性判定 + 清掉坏文件（精确相等 / 非空两条口径） _remove_quietly ：删文件并吞掉 OSError（Windows 句柄未释放时 remove 会抛） 复杂度（同口径 AST 实测）： _podcast_stream_download 63 行 / 圈 19 / 嵌套 10 → 21 行 / 圈 3 / 嵌套 1 新增 _stream_to_part 25 行/圈 8/嵌套 4 · _report_progress 22/6/3 · _verify_downloaded 14/3/1 文件内嵌套 ≥5 层 2 → 1（余下那个是本次未动的 _podcast_download_worker） 刻意保留的语义（是决定，不是疏漏）： - 取消时 **.part 留存不删**（改名不发生，下次同名下载直接覆盖）——已用测试固化。 不「顺手」改成删除，那是行为变更。 - 进度 msg 的计算与「是否真有可取的任务」无关：task_id 为空时仍会格式化字符串再 return。这是既有的无害浪费，一并保留。 - 完整性口径原样：已知期望大小要求**精确相等**（放宽到 95% 容差会交付截断的坏文件 还照扣次数），期望未知则退化为非空校验。 等价性证据（两道）： 1. 反向注入验证：把 HEAD 的旧实现换回去，用同一套 tests/test_podcast_stream.py 跑 → 12 例**全过**，证明这批测试忠实编码旧行为、对新实现构成等价性验证。 2. 新增 12 例行为契约（该函数此前零覆盖）：正常落盘与改名、空分块跳过、 Content-Length 兜底、字节数不符清坏文件、空下载报错、已知大小不容忍部分交付、 上游 4xx、开始前取消、中途取消留 .part、running 任务写 msg/live_percent、 终态任务不被覆盖、无 task_id 不报错。 顺带记录一个测试自身的坑：替身响应最初用 list(chunks) 归一化，导致传入生成器的 副作用（中途置取消位）在**构造时刻**就执行，测出来变成「开始前取消」——两条本不 相同的路径被混成一条。已改为保留原 iterable 并写明原因。 验证：ruff 全过 · pyright 0/0 · pytest 245 passed（233→245）· 生产 data/ 未被触碰。
487 lines
20 KiB
Python
487 lines
20 KiB
Python
# -*- coding: utf-8 -*-
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"""播客单集与整台打包 worker。
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整台打包的骨架（状态机 / 暂停 / 名额 / 终态收敛 / 结算）在
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:mod:`services._zipcore`，本模块只保留播客侧策略：清单组装（整台或指定单集）、
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逐集顺序下载、按实际集数补扣、单条目入包（首集附封面）。
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"""
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import os
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import shutil
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import threading
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import time
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import traceback
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import zipfile
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any
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import auth_system
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from core.state import (
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DOWNLOAD_TASKS,
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DOWNLOAD_TASKS_LOCK,
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)
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from music_api import (
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APIException,
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podcast,
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)
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from music_downloader import (
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DownloadCanceled,
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DownloadException,
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fetch_cover_bytes,
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)
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from ._shared import (
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_record_log,
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)
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from ._taskcore import (
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_mark_task_terminal,
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_settle_batch_billing,
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)
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from ._zipcore import (
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ZipContext,
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ZipJob,
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run_zip_job,
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)
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from .api_service import (
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api_service,
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)
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from .streaming import (
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_stream_open,
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)
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def _podcast_safe_name(s: str, fallback: str = 'unknown') -> str:
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"""文件名安全化（去除非法字符）"""
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s = ''.join(c for c in str(s or '') if c not in r'<>:"/\|?*' and ord(c) >= 32).strip()
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return s or fallback
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def _remove_quietly(path: Path) -> None:
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"""删除文件并忽略失败（Windows 上句柄未释放时 os.remove 会抛 OSError）。"""
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try:
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os.remove(str(path))
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except OSError:
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pass
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def _report_progress(task_id: str, progress_label: str, done: int, total: int) -> None:
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"""把一次进度写进任务表；task_id 为空或任务不在 running 时只计算不写。
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msg 的计算与「是否真有可取的任务」无关（历史实现如此），故 task_id 为空时
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仍会格式化字符串——保持这一无害的既有行为，不做「优化」。
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"""
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pct = 0
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if total:
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pct = min(99, int(done / total * 100))
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msg = (f"{progress_label} {pct}% · "
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f"{api_service._format_file_size(done)}/{api_service._format_file_size(total)}")
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else:
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msg = f"{progress_label} 已下载 {api_service._format_file_size(done)}"
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if not task_id:
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return
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with DOWNLOAD_TASKS_LOCK:
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t = DOWNLOAD_TASKS.get(task_id)
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if t and t['status'] == 'running':
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t['msg'] = msg
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# 单集任务的字节级进度（批量任务保持按集数口径）
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if t.get('type') == 'single' and total:
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t['live_percent'] = min(99.0, float(pct))
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def _stream_to_part(url: str, part: Path, total_size: int, cancel_ev: threading.Event,
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task_id: str, progress_label: str) -> tuple[int, int]:
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"""把响应体流式写入 part，返回 (已写字节数, 期望总大小)。
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期望总大小取入参，缺失时回落到 Content-Length（仍可能为 0，表示上游没给）。
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"""
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done = 0
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last_update = 0.0
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with _stream_open(url, timeout=60) as r:
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if r.status >= 400:
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raise DownloadException(f"上游返回 {r.status}")
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total = total_size or int(r.headers.get('Content-Length') or 0)
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with open(part, 'wb') as f:
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for chunk in r.iter_content(chunk_size=256 * 1024):
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if cancel_ev.is_set():
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raise DownloadCanceled("任务已取消")
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if not chunk:
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continue
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f.write(chunk)
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done += len(chunk)
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now = time.time()
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if now - last_update > 0.5:
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last_update = now
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_report_progress(task_id, progress_label, done, total)
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return done, total
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def _verify_downloaded(target: Path, done: int, total_size: int) -> None:
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"""完整性校验：不达标则删掉已落地的文件并抛 DownloadException。
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为什么非要校验：CDN 提前断流时 iter_content 会「正常」结束，文件静默截断。
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已知期望大小时要求**精确相等**（API 报的大小与实际一致；放宽到 95% 容差会
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交付截断的坏文件还照扣次数）；期望未知时退化为非空校验——Content-Length
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兜底值可能是压缩口径，不做精确比对。
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"""
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if total_size and done != total_size:
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_remove_quietly(target)
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raise DownloadException(f"下载不完整（{done}/{total_size} 字节），请重试")
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if not total_size and done <= 0:
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_remove_quietly(target)
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raise DownloadException("下载内容为空，请重试")
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def _podcast_stream_download(url: str, target: Path, total_size: int,
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cancel_ev: threading.Event,
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task_id: str = '', progress_label: str = '') -> int:
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"""流式下载播客音频到 target（先写 .part 再改名），返回实际字节数。
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自动加入全局下载信号量排队；每 0.5s 更新一次任务进度消息。
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取消时 .part 会留存（不删）——下次下载同名文件直接覆盖，是既有行为。
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"""
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part = target.with_name(target.name + '.part')
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# 等待全局下载名额期间可被取消（与音乐批量 BATCH_ZIP_SEM 同语义）
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sem = api_service.downloader._download_semaphore
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if not sem.acquire_cancellable(cancel_ev):
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raise DownloadCanceled("任务已取消")
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try:
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done, _total = _stream_to_part(url, part, total_size, cancel_ev, task_id, progress_label)
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finally:
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sem.release()
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if part.exists():
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part.replace(target)
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_verify_downloaded(target, done, total_size)
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return done
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def _podcast_resolve_audio(program: dict[str, Any], quality: str,
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cookies: dict[str, str]) -> dict[str, Any]:
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"""解析单集音频直链，失败抛 DownloadException"""
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song_id = program.get('main_song_id')
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if not song_id:
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raise DownloadException("该单集缺少音频信息（mainSong）")
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url_info = podcast.resolve_episode_url(song_id, cookies, quality)
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if not url_info or not url_info.get('url'):
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raise DownloadException("未获取到音频直链（单集可能已下架或受版权限制）")
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return url_info
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def _podcast_download_worker(task_id: str) -> None:
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"""后台播客单集下载：解析单集 → 音质降级取直链 → 流式下载（可选 ZIP 打包）
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任务 type 为 'single'，完成后经 /download/result 交付，与单曲下载共用交付通道。
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落盘文件进入任务专属目录且带节目 ID，跨任务永不重名；清理只动本任务目录。
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"""
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import tempfile as _tempfile
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file_path_str: str | None = None
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zip_tmp_path: str | None = None
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task_dir: Path | None = None
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try:
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with DOWNLOAD_TASKS_LOCK:
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task = DOWNLOAD_TASKS[task_id]
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task['status'] = 'running'
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task['msg'] = '解析单集信息...'
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params = task['params']
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cancel_ev = task['cancel']
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program_id = params['program_id']
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quality = params['quality']
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need_zip = params['need_zip']
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cookies = params['cookies']
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remote_ip = params.get('remote_ip') or '-'
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program = podcast.get_program_detail(program_id, cookies)
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url_info = _podcast_resolve_audio(program, quality, cookies)
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serial = int(program.get('serial_num') or 0)
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name = program.get('name') or program.get('main_song_name') or '播客单集'
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prefix = f"{serial:03d} - " if serial else ''
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base = _podcast_safe_name(f"{prefix}{name}")
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ext = (url_info.get('type') or 'mp3').lower().lstrip('.')
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# 磁盘名附节目 ID + 任务目录隔离（两个任务同下载一集互不覆盖、互不删除）
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task_dir = api_service.downloads_path / 'tasks' / task_id
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task_dir.mkdir(parents=True, exist_ok=True)
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disk_name = f"{base} [{program_id}].{ext}"
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target = task_dir / disk_name
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filename = f"{base}.{ext}" # 交付名保持干净（不带 ID）
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with DOWNLOAD_TASKS_LOCK:
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t = DOWNLOAD_TASKS[task_id]
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t['msg'] = '下载中...'
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_podcast_stream_download(url_info['url'], target, url_info.get('size', 0),
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cancel_ev, task_id, '下载中')
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if cancel_ev.is_set():
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raise DownloadCanceled("任务已取消")
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file_path_str = str(target)
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result: dict[str, Any]
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if need_zip:
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fd, zip_tmp_path = _tempfile.mkstemp(prefix='podcast_zip_', suffix='.zip',
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dir=str(task_dir))
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os.close(fd)
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with zipfile.ZipFile(zip_tmp_path, 'w', zipfile.ZIP_DEFLATED) as zf:
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zf.write(file_path_str, arcname=filename)
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cover_url = program.get('cover_url') or ''
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if cover_url:
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try:
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cover = fetch_cover_bytes(cover_url)
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if cover:
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zf.writestr(f"{base}.jpg", cover)
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except Exception:
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pass
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# info.txt 不再写直链（真实 URL 不应随交付文件外泄）
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info_txt = (
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f"单集: {name}\n"
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f"播客: {program.get('radio_name') or ''}\n"
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f"主播: {program.get('dj_name') or ''}\n"
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f"时长: {program.get('duration_text') or ''}\n"
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f"音质: {api_service._get_quality_display_name(url_info.get('level', quality))}\n"
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)
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zf.writestr("info.txt", info_txt)
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# 打包阶段后同样以取消检查收口
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if cancel_ev.is_set():
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raise DownloadCanceled("任务已取消")
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result = {
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'file_path': file_path_str,
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'zip_path': zip_tmp_path,
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'filename': f"{base}.zip",
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'mimetype': 'application/zip',
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'audio_files': [file_path_str],
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}
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else:
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result = {
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'file_path': file_path_str,
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'filename': filename,
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'mimetype': f"audio/{ext}",
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'audio_files': [file_path_str],
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}
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# 最终发布前的取消检查（末段取消不得覆盖为 done）
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if cancel_ev.is_set():
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raise DownloadCanceled("任务已取消")
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with DOWNLOAD_TASKS_LOCK:
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t = DOWNLOAD_TASKS.get(task_id)
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if t is None or t.get('status') in ('canceled', 'error'):
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raise DownloadCanceled("任务已取消")
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t['status'] = 'done'
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t['completed_at'] = time.time()
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t['done'] = 1
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t['msg'] = '下载完成'
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t['result'] = result
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# 交付已落定；结算失败不再把任务改标 error（同单曲）
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try:
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auth_system.ledger_settle(task_id, 1, 'delivered')
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except Exception as _e:
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api_service.logger.error(f"播客单集交付结算失败（重启对账兜底）: {task_id} {_e}")
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try:
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_record_log('下载', remote_ip, f"[播客] {name}")
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except Exception:
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pass
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api_service.logger.info(f"播客单集下载完成: {filename} ({task_id})")
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except DownloadCanceled:
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_mark_task_terminal(task_id, 'canceled', '任务已取消')
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try:
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auth_system.ledger_settle(task_id, 0, 'canceled')
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except Exception:
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pass
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if task_dir is not None:
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shutil.rmtree(str(task_dir), ignore_errors=True)
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api_service.logger.info(f"播客单集下载已取消: {task_id}")
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except DownloadException as e:
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_mark_task_terminal(task_id, 'error', str(e))
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try:
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auth_system.ledger_settle(task_id, 0, 'error')
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except Exception:
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pass
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if task_dir is not None:
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shutil.rmtree(str(task_dir), ignore_errors=True)
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api_service.logger.error(f"播客单集下载失败: {task_id} {e}")
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except Exception as e:
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# 非预期异常原文 logger 先行，用户可见文案泛化（教训）
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api_service.logger.error(f"播客单集下载异常: {task_id} {e}\n{traceback.format_exc()}")
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_mark_task_terminal(task_id, 'error', '下载失败，请稍后重试')
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try:
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auth_system.ledger_settle(task_id, 0, 'error')
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except Exception:
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pass
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if task_dir is not None:
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shutil.rmtree(str(task_dir), ignore_errors=True)
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def _podcast_cleanup_files(paths: list[str | None]) -> None:
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"""清理播客任务产生的临时/残留文件"""
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for p in paths:
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if not p:
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continue
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try:
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os.remove(p)
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except OSError:
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pass
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# 连带清理可能残留的 .part 文件
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try:
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part = Path(str(p) + '.part')
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if part.exists():
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part.unlink()
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except OSError:
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pass
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@dataclass(frozen=True)
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class _EpisodePayload:
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"""一集下载完成后的入包素材（下载线程产出，落包线程消费）。"""
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path: str
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base: str
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ext: str
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class _PodcastZipJob(ZipJob):
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"""整台播客打包：逐集顺序下载（窗口=1）→ 单条目入包，首集附封面。
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并发刻意等于音乐批量：同样占用全局批量名额（BATCH_ZIP_SEM，全局 3），
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逐集 acquire/release——暂停等待/取消时不长期占名额；音频本身仍受全局
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下载信号量约束。原实现不受批量并发控制，多用户同时打包会无限并发。
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"""
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tag = '播客打包'
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noun = '集'
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item_noun = '单集'
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tmp_prefix = 'podcast_batch_'
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start_msg = '解析单集列表...'
|
||
concurrency = 1
|
||
|
||
def __init__(self) -> None:
|
||
self._radio_name = ''
|
||
|
||
def prepare(self, params: dict[str, Any], task_id: str, failed: list[str]) -> list[Any]:
|
||
cookies = params['cookies']
|
||
radio_id = params['radio_id']
|
||
limit = params['limit']
|
||
# 组装单集清单：整台电台（正序全量）或指定单集ID列表
|
||
if radio_id:
|
||
episodes = podcast.list_radio_all_program_ids(radio_id, cookies, max_count=limit)
|
||
if not episodes:
|
||
raise DownloadException("该电台暂无可下载的单集")
|
||
else:
|
||
episodes = []
|
||
for pid in (params.get('ids') or []):
|
||
try:
|
||
prog = podcast.get_program_detail(pid, cookies)
|
||
episodes.append({
|
||
'id': prog['id'],
|
||
'name': prog['name'],
|
||
'main_song_id': prog['main_song_id'],
|
||
'serial_num': prog['serial_num'],
|
||
'cover_url': prog['cover_url'],
|
||
'detail': prog,
|
||
})
|
||
except APIException as ae:
|
||
failed.append(f"{pid}({ae})")
|
||
episodes = episodes[:limit]
|
||
if not episodes:
|
||
raise DownloadException("没有可下载的单集")
|
||
|
||
self._radio_name = _podcast_safe_name(params.get('radio_name') or '', '播客')
|
||
return episodes
|
||
|
||
def supplement(self, task_id: str, params: dict[str, Any], count: int) -> None:
|
||
"""按次计费补扣：整台电台提交时只预扣 1 次，此处按实际单集数补足差额。
|
||
|
||
补扣失败（余额不足/数据库异常）任务必须失败并按账本退费——不允许无账本继续交付。
|
||
"""
|
||
try:
|
||
_buid = params.get('billing_uid')
|
||
_extra = count - int(params.get('billed') or 1)
|
||
if _buid and _extra > 0:
|
||
if not auth_system.ledger_supplement(task_id, _extra):
|
||
raise DownloadException(
|
||
f"补扣下载次数失败（需补扣 {_extra} 次），任务已取消，预扣部分将退回")
|
||
if _buid:
|
||
with DOWNLOAD_TASKS_LOCK:
|
||
DOWNLOAD_TASKS[task_id]['billing_user_id'] = int(_buid)
|
||
DOWNLOAD_TASKS[task_id]['billing_cost'] = count
|
||
except DownloadCanceled:
|
||
raise
|
||
except DownloadException:
|
||
raise
|
||
except Exception as e:
|
||
raise DownloadException(f"补扣下载次数异常: {e}") from e
|
||
|
||
def download_one(self, item: Any, idx: int, ctx: ZipContext) -> _EpisodePayload:
|
||
ep = item
|
||
label = f"[{idx}/{ctx.total}] {ep['name'][:24]}"
|
||
ctx.progress(f"{label} 解析中...")
|
||
cookies = ctx.params['cookies']
|
||
prog = ep.get('detail') or podcast.get_program_detail(ep['id'], cookies)
|
||
url_info = _podcast_resolve_audio(prog, ctx.params['quality'], cookies)
|
||
ctx.progress(f"{label} 下载中...")
|
||
ext = (url_info.get('type') or 'mp3').lower().lstrip('.')
|
||
serial = int(ep.get('serial_num') or 0)
|
||
prefix = f"{serial:03d} - " if serial else ''
|
||
base = _podcast_safe_name(f"{prefix}{ep['name']}")
|
||
# 中间文件移入任务目录——落 downloads 根目录会被缓存清扫按 mtime 打断慢速
|
||
# 单集（Linux 上 unlink 打开中的文件）
|
||
tmp_audio = ctx.work_dir / f"podcast_zip_tmp_{ctx.task_id}_{idx}.{ext}"
|
||
try:
|
||
_podcast_stream_download(url_info['url'], tmp_audio,
|
||
url_info.get('size', 0), ctx.cancel_ev)
|
||
except Exception:
|
||
# 下载失败即清（.part 残片同清）；成功时由 write_entry 的 finally 清
|
||
_podcast_cleanup_files([str(tmp_audio)])
|
||
raise
|
||
return _EpisodePayload(path=str(tmp_audio), base=base, ext=ext)
|
||
|
||
def write_entry(self, item: Any, idx: int, payload: _EpisodePayload, ctx: ZipContext) -> None:
|
||
ep = item
|
||
try:
|
||
# 重名条目自动追加序号（同名单集/同号不同集不得互相覆盖）
|
||
arcname = f"{payload.base}.{payload.ext}"
|
||
k = 2
|
||
while arcname in ctx.used_arcnames:
|
||
arcname = f"{payload.base} ({k}).{payload.ext}"
|
||
k += 1
|
||
ctx.used_arcnames.add(arcname)
|
||
ctx.zf.write(payload.path, arcname=arcname, compress_type=zipfile.ZIP_STORED)
|
||
# 首集附带封面，便于识别
|
||
if idx == 1 and ep.get('cover_url'):
|
||
try:
|
||
cover = fetch_cover_bytes(ep['cover_url'])
|
||
if cover:
|
||
ctx.zf.writestr("cover.jpg", cover, compress_type=zipfile.ZIP_STORED)
|
||
except Exception:
|
||
pass
|
||
finally:
|
||
# finally 连带清理 .part 残片（原实现只删正文，取消/失败时残片要等
|
||
# 1 小时缓存清扫兜底）
|
||
_podcast_cleanup_files([payload.path])
|
||
|
||
def fail_label(self, item: Any) -> str:
|
||
"""失败文案用单集名而非整个条目字典（引擎拼成「单集名(异常)」）。"""
|
||
return str(item.get('name') or '')
|
||
|
||
def done_msg(self, item: Any, idx: int, ctx: ZipContext) -> str:
|
||
return f"[{idx}/{ctx.total}] {item['name'][:24]} 完成"
|
||
|
||
def zip_filename(self, ok_count: int) -> str:
|
||
return f"播客_{self._radio_name or '打包'}_{ok_count}集.zip"
|
||
|
||
def log_label(self) -> str:
|
||
return f"{self._radio_name} "
|
||
|
||
def all_failed_msg(self, failed: list[str], refunded: int) -> str:
|
||
return f"全部单集下载失败: {'; '.join(failed[:3])}" + (
|
||
f"（已退回 {refunded} 次下载次数）" if refunded else '')
|
||
|
||
def on_delivered(self, items: list[Any], task_id: str, params: dict[str, Any]) -> None:
|
||
try:
|
||
first_name = items[0].get('name') if items else ''
|
||
_record_log('下载', params.get('remote_ip') or '-',
|
||
f"[播客打包] {self._radio_name} · {first_name}")
|
||
except Exception:
|
||
pass
|
||
|
||
|
||
def _podcast_zip_worker(task_id: str) -> None:
|
||
"""整台播客打包：逐集 下载→入包即删，支持取消与断线暂停（复用批量任务机制）"""
|
||
run_zip_job(_PodcastZipJob(), task_id, settle=_settle_batch_billing)
|