Archived
snowy-yang
69a50c2c31
拆掉「同步调异步 / 异步桥同步」两类垫片的第二半（HTTP 线 B2 见前序提交）。 worker 侧此前是「起线程跑同步函数、函数体内部再用 asyncio.to_thread 把活塞给 另一条循环」——线程与协程互等，取消/暂停只能靠轮询。本轮把 worker 自身变成 协程，由 _start_task 直接挂到应用事件循环上，桥接层随之失去存在理由。 改动（按子系统）： - music_downloader：downloader / _aria2 / _concurrency / cover / _http / __main__ 全链路协程化。per-file 锁改 asyncio.Lock；计数闸改 「active 计数 + await asyncio.sleep(0.5)」的可取消等待（原阻塞式 with 会让 已取消任务仍要等全局名额腾出，卡死并拖后腿退款）；aria2p 的同步 RPC 仍经 to_thread，轮询改 asyncio.sleep；新增 core.http_client.iter_chunks，把**流式 读取期**的 aiohttp.ClientError 收敛成 UpstreamNetworkError（请求建立阶段早已 有这条路径，读取阶段此前没有，断流会绕过调用方的 UpstreamError 分类）。 删除 get_http_session / _SESSION_LOCAL。 models._RetryFromScratch 不再继承 requests.RequestException 而继承 Exception： 它是「续传起点失效、残片已清、从头重下」，既不是确定性失败 (DownloadException)，也不是残片已保留的网络失败(UpstreamError)，必须独立 成类且在 except 链中先于二者捕获。 - music_api：podcast.py 全部函数协程化（直链解析内部改 await NeteaseAPI.get_song_url）；compat.py 删除——16 个死掉的同步门面早已 清空，文件只剩空壳。 - services：_taskcore / _zipcore / batch / downloads / podcast / tasks 协程化。 threading.Thread → loop.create_task（任务句柄字段 worker_thread → worker_task），ThreadPoolExecutor → asyncio.gather + asyncio.Semaphore， 终态函数与结算回调全部改 await；监控线程里「worker 已死」判定改 task.done()。 删除 services/streaming.py（同步流垫片，唯一消费者已迁到 core.http_client.open）。zipfile 实例仍非线程安全，故「下载」并行、 「入包」严格串行。 - web：路由层 130+ 处 to_thread 拆除——被包住的目标自己已是协程，再包一层只是 把协程丢进线程里跑一圈。tasks_registry.start_task 直接 create_task。 web/app.py 关闭段去掉 async_bridge.shutdown()（不再有第二条约循环）。 web/routers/download.py 的播客端点补上 3 处漏掉的 await （extract_podcast_ref / get_radio_detail）——漏掉时不报错、只静默返回协程对象， 靠 pyright 抓出来后修正。 留在 to_thread 上的都是**正当的阻塞卸载**：同步 SQLite 落库与账本结算、 mutagen 全量重写标签、zipfile 整段拷贝、shutil.rmtree、aria2p 的同步 RPC、 PBKDF2 的 10 万次迭代。ruff 对残留的本地元数据操作（exists/stat/os.replace/ 往 .part 顺序写分块）按「微秒级、卸载的调度开销大于操作本身」放行，pyproject 逐条注明理由。 取消/暂停仍由 threading.Event 承载：置位方是请求线程/监控线程，读取方是 worker 协程，只有「置位」与「轮询读取」两种操作，既不需要跨循环唤醒也不会卡住事件 循环——比 asyncio.Event 更省心（ASYNC110 同理按此豁免）。 测试：10 个文件的替身边界同步迁移——网络替身从 core.sync_http 的 get_http_session 换成 downloader/服务模块的 _http.open + **真实** iter_chunks （顺带钉住读取期异常收敛）；`_run` 改为在独立线程里 asyncio.run(worker(...))； aria2 的假时钟从 time.sleep 换成 _POLL_INTERVAL=0；monitor 的线程句柄替身换成 done() 可控的轻量替身（asyncio.Task 的构造需要运行中的事件循环，而监控循环跑在 常驻线程里）；podcast / 封面 / 结算包装等替身一律改 async。 门禁：ruff 全过 / pyright 0-0 / pytest 383 项全绿（0 失败）。 下一步 B2：auth_system 12 个模块改 aiosqlite 背板、web 层剩余 to_thread 收尾； B3：删 core/sync_http.py、core/async_bridge.py、core/http_errors.py（现仅 sync_http 自用）。
619 lines
21 KiB
Python
619 lines
21 KiB
Python
# -*- coding: utf-8 -*-
|
||
"""MusicDownloader.download_music_file 的行为契约测试（沙箱，不触碰生产 data/）。
|
||
|
||
为什么：download_music_file 是**唯一**的音频落盘路径——单曲 worker 与音乐批量
|
||
ZIP 都经它，约 205 行 / 圈复杂度 47，此前**零直接测试覆盖**（test_zip_workers 里
|
||
只有一个 stub）。它同时承担缓存校验、断点续传、内容嗅探、体积上限、取消语义、
|
||
重试退避与元数据写入，任何一条被拆坏都不会有测试报警。
|
||
|
||
断言只依赖「调用后世界里发生了什么」——返回值、磁盘上的文件、发往网络的请求——
|
||
不引用任何内部函数名，因此本文件可作为后续拆分的等价性验证器。
|
||
|
||
替身约定（均为模块级符号，替换点在 downloader 模块命名空间）：
|
||
- 网络：``_http``（core.http_client 的进程级异步客户端）——替身提供
|
||
``async open(method, url, **kw)``，返回带 ``status``/``headers``/``content``
|
||
的未关闭响应；分块读取走**真实的** ``iter_chunks``，顺带钉住「读取期异常
|
||
收敛为 UpstreamNetworkError」这条边界。
|
||
- aria2：``get_backend``（返回 None = 强制走内置 HTTP 通道）
|
||
- 内容嗅探：``_sniff_audio_header``（默认放行，按需置 False）
|
||
- 元数据写入：``MusicDownloader._write_metadata``（不真跑 mutagen）
|
||
"""
|
||
from __future__ import annotations
|
||
|
||
import threading
|
||
from pathlib import Path
|
||
from typing import Any
|
||
|
||
import aiohttp
|
||
import pytest
|
||
|
||
from music_downloader import DownloadCanceled, DownloadException, MusicInfo
|
||
from music_downloader.downloader import MusicDownloader
|
||
|
||
# ============ 替身 ============
|
||
|
||
|
||
class _FakeContent:
|
||
"""``aiohttp.ClientResponse.content`` 的替身。
|
||
|
||
chunks 保留原始 iterable（**不要** list() 归一化）：生成器的副作用
|
||
（如中途置取消位）若在构造时刻就求值，「中途取消」会被悄悄测成
|
||
「开始前取消」——两条不同的路径混成一条，而测试仍是绿的。
|
||
|
||
元素约定：可调用对象 → 调用一次（注入副作用，如 cancel.set）；
|
||
异常实例 → 抛出（模拟读取期断流）；其余 → 作为分块产出。
|
||
"""
|
||
|
||
def __init__(self, chunks):
|
||
self._chunks = chunks
|
||
|
||
async def iter_chunked(self, chunk_size=0):
|
||
for item in self._chunks:
|
||
if callable(item):
|
||
item()
|
||
continue
|
||
if isinstance(item, BaseException):
|
||
raise item
|
||
yield item
|
||
|
||
|
||
class _FakeResponse:
|
||
"""``core.http_client.open`` 返回的未关闭流式响应替身。"""
|
||
|
||
def __init__(self, chunks, status=200, headers=None, reason=''):
|
||
self.status = status
|
||
self.reason = reason
|
||
self.headers = dict(headers or {})
|
||
self.content = _FakeContent(chunks)
|
||
self.closed = False
|
||
|
||
def close(self):
|
||
self.closed = True
|
||
|
||
|
||
class _FakeClient:
|
||
"""记录每次 open（含 kw）并按序产出响应；responder 可随用例重装。"""
|
||
|
||
def __init__(self):
|
||
self._responder = None
|
||
self.calls: list[tuple[str, dict[str, Any]]] = []
|
||
|
||
def set_responder(self, responder):
|
||
self._responder = responder
|
||
|
||
async def open(self, method, url, **kw):
|
||
self.calls.append((url, kw))
|
||
assert self._responder is not None, '本用例未安装网络替身'
|
||
return self._responder(len(self.calls), url, kw)
|
||
|
||
|
||
def _body(size, status=200, content_range=None):
|
||
"""固定返回 size 字节的响应工厂（每次调用产出新响应对象）。"""
|
||
|
||
def _mk(_attempt, _url, _kw):
|
||
headers = {'Content-Range': content_range} if content_range else {}
|
||
return _FakeResponse([b'x' * size], status=status, headers=headers)
|
||
|
||
return _mk
|
||
|
||
|
||
def _headers(kw) -> dict[str, str]:
|
||
"""取一次调用的请求头——没带 Range 时 downloader 传的是 None。"""
|
||
return kw.get('headers') or {}
|
||
|
||
|
||
def _info(mid=101, size=20, file_type='mp3'):
|
||
return MusicInfo(
|
||
id=mid, name='测试曲', artists='歌手', album='专辑', pic_url='',
|
||
duration=180, track_number=1, download_url='http://cdn.test/a.mp3',
|
||
file_type=file_type, file_size=size, quality='standard',
|
||
)
|
||
|
||
|
||
def _paths(dl, info):
|
||
"""按生产同一函数推算落盘路径与 .part 路径（纯函数，可直接复用）。"""
|
||
fp = dl._build_file_path(info)
|
||
return fp, fp.with_name(fp.name + '.part')
|
||
|
||
|
||
@pytest.fixture()
|
||
def env(tmp_path, monkeypatch):
|
||
"""返回 (downloader, state, install)。
|
||
|
||
- state['sniff']：内容嗅探结果，默认 True
|
||
- state['meta']：_write_metadata 的调用记录 [(文件路径, fields), ...]
|
||
- install(responder) -> _FakeClient：安装网络替身，返回它以便断言
|
||
"""
|
||
state: dict[str, Any] = {'sniff': True, 'meta': []}
|
||
client = _FakeClient()
|
||
|
||
def install(responder):
|
||
client.set_responder(responder)
|
||
return client
|
||
|
||
async def _record_meta(self, file_path, music_info, fields=None):
|
||
state['meta'].append((str(file_path), fields))
|
||
return True
|
||
|
||
monkeypatch.setattr('music_downloader.downloader._http', client)
|
||
monkeypatch.setattr('music_downloader.downloader.get_backend', lambda: None)
|
||
monkeypatch.setattr('music_downloader.downloader._sniff_audio_header',
|
||
lambda _p: state['sniff'])
|
||
monkeypatch.setattr(MusicDownloader, '_write_metadata', _record_meta)
|
||
|
||
install(lambda *a: pytest.fail('本用例不应发出网络请求'))
|
||
dl = MusicDownloader(download_dir=str(tmp_path))
|
||
return dl, state, install
|
||
|
||
|
||
# ============ 正常落盘 ============
|
||
|
||
|
||
async def test_success_promotes_part_to_final(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, part = _paths(dl, info)
|
||
install(_body(20))
|
||
|
||
r = await dl.download_music_file(101, music_info=info)
|
||
|
||
assert r.success and r.error_message == ''
|
||
assert Path(r.file_path or '') == fp
|
||
assert r.file_size == 20 and fp.read_bytes() == b'x' * 20
|
||
assert not part.exists(), '完成后 .part 应改名转正'
|
||
|
||
|
||
async def test_empty_chunks_skipped(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, _ = _paths(dl, info)
|
||
install(lambda a, u, kw: _FakeResponse([b'', b'x' * 20, b'']))
|
||
seen: list[int] = []
|
||
|
||
r = await dl.download_music_file(101, music_info=info,
|
||
progress_cb=lambda w, _t: seen.append(w))
|
||
|
||
assert r.success and fp.stat().st_size == 20
|
||
assert seen == [0, 20], '空分块不写盘也不触发进度回调'
|
||
|
||
|
||
async def test_progress_reports_resume_start_then_each_chunk(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
install(lambda a, u, kw: _FakeResponse([b'a' * 8, b'b' * 12]))
|
||
seen: list[tuple[int, int]] = []
|
||
|
||
r = await dl.download_music_file(101, music_info=info,
|
||
progress_cb=lambda w, t: seen.append((w, t)))
|
||
|
||
assert r.success
|
||
assert seen == [(0, 20), (8, 20), (20, 20)], '起始回调带续传起点，此后每块一次'
|
||
|
||
|
||
async def test_progress_callback_exception_never_breaks_download(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
install(_body(20))
|
||
|
||
def _boom(_w, _t):
|
||
raise RuntimeError('回调炸了')
|
||
|
||
r = await dl.download_music_file(101, music_info=info, progress_cb=_boom)
|
||
|
||
assert r.success, '进度回调异常绝不影响下载主流程'
|
||
|
||
|
||
async def test_music_info_fetched_when_not_provided(env, monkeypatch):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
seen: list[tuple] = []
|
||
|
||
async def _fake_info(mid, q, c=None):
|
||
seen.append((mid, q))
|
||
return info
|
||
|
||
monkeypatch.setattr(dl, 'get_music_info', _fake_info)
|
||
install(_body(20))
|
||
|
||
r = await dl.download_music_file(101, 'lossless')
|
||
|
||
assert r.success and seen == [(101, 'lossless')]
|
||
|
||
|
||
# ============ 缓存校验 ============
|
||
|
||
|
||
async def test_cache_hit_skips_network(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, _ = _paths(dl, info)
|
||
fp.write_bytes(b'c' * 20)
|
||
session = install(lambda *a: pytest.fail('缓存命中不应发网络请求'))
|
||
|
||
r = await dl.download_music_file(101, music_info=info)
|
||
|
||
assert r.success and r.file_size == 20
|
||
assert session.calls == []
|
||
|
||
|
||
async def test_cache_size_mismatch_triggers_redownload(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, _ = _paths(dl, info)
|
||
fp.write_bytes(b'c' * 15) # 与本次期望不符 = 缓存 miss
|
||
session = install(_body(20))
|
||
|
||
r = await dl.download_music_file(101, music_info=info)
|
||
|
||
assert r.success and fp.read_bytes() == b'x' * 20
|
||
assert len(session.calls) == 1, '坏缓存应被删除并重下，而不是当结果交付'
|
||
|
||
|
||
async def test_zero_byte_cache_rejected_when_expected_size_unknown(env):
|
||
dl, _state, install = env
|
||
info = _info(size=0)
|
||
fp, _ = _paths(dl, info)
|
||
fp.write_bytes(b'')
|
||
session = install(lambda a, u, kw: _FakeResponse([b'good']))
|
||
|
||
r = await dl.download_music_file(101, music_info=info)
|
||
|
||
assert r.success and fp.read_bytes() == b'good'
|
||
assert len(session.calls) == 1, '期望未知时至少拒绝 0 字节坏文件'
|
||
|
||
|
||
# ============ 断点续传 ============
|
||
|
||
|
||
async def test_resume_sends_range_and_appends(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, part = _paths(dl, info)
|
||
part.write_bytes(b'p' * 10)
|
||
session = install(lambda a, u, kw: _FakeResponse(
|
||
[b'q' * 10], status=206, headers={'Content-Range': 'bytes 10-19/20'}))
|
||
seen: list[tuple[int, int]] = []
|
||
|
||
r = await dl.download_music_file(101, music_info=info,
|
||
progress_cb=lambda w, t: seen.append((w, t)))
|
||
|
||
assert r.success
|
||
assert _headers(session.calls[0][1]).get('Range') == 'bytes=10-'
|
||
assert fp.read_bytes() == b'p' * 10 + b'q' * 10, '续传应追加而非覆盖'
|
||
assert seen[0] == (10, 20), '起始进度应带续传起点'
|
||
|
||
|
||
async def test_server_ignoring_range_rewrites_from_zero(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, part = _paths(dl, info)
|
||
part.write_bytes(b'p' * 10)
|
||
install(lambda a, u, kw: _FakeResponse([b'r' * 20], status=200))
|
||
|
||
r = await dl.download_music_file(101, music_info=info)
|
||
|
||
assert r.success and fp.read_bytes() == b'r' * 20, '服务器返回 200 须从头重写'
|
||
|
||
|
||
async def test_complete_part_promoted_without_network(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, part = _paths(dl, info)
|
||
part.write_bytes(b'z' * 20) # 已下完但未改名
|
||
session = install(lambda *a: pytest.fail('完整残片不应发网络请求'))
|
||
|
||
r = await dl.download_music_file(101, music_info=info)
|
||
|
||
assert r.success and r.file_size == 20
|
||
assert session.calls == []
|
||
assert fp.read_bytes() == b'z' * 20 and not part.exists()
|
||
|
||
|
||
async def test_oversized_part_discarded_starts_from_zero(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
_fp, part = _paths(dl, info)
|
||
part.write_bytes(b'o' * 30) # 超尺寸残片没有续传价值
|
||
session = install(_body(20))
|
||
|
||
r = await dl.download_music_file(101, music_info=info)
|
||
|
||
assert r.success
|
||
assert 'Range' not in _headers(session.calls[0][1])
|
||
|
||
|
||
async def test_zero_byte_part_discarded(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
_fp, part = _paths(dl, info)
|
||
part.write_bytes(b'')
|
||
session = install(_body(20))
|
||
|
||
r = await dl.download_music_file(101, music_info=info)
|
||
|
||
assert r.success and 'Range' not in _headers(session.calls[0][1])
|
||
|
||
|
||
async def test_content_range_offset_mismatch_restarts_from_scratch(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, part = _paths(dl, info)
|
||
part.write_bytes(b'p' * 10)
|
||
|
||
def responder(n, _url, _kw):
|
||
if n == 1:
|
||
return _FakeResponse([b'q' * 5], status=206,
|
||
headers={'Content-Range': 'bytes 3-7/20'})
|
||
return _FakeResponse([b'f' * 20], status=200)
|
||
|
||
session = install(responder)
|
||
|
||
r = await dl.download_music_file(101, music_info=info, retries=1)
|
||
|
||
assert r.success and len(session.calls) == 2
|
||
assert 'Range' not in _headers(session.calls[1][1]), '清残片后应从头下'
|
||
assert fp.read_bytes() == b'f' * 20
|
||
|
||
|
||
async def test_206_without_content_range_restarts_from_scratch(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
_fp, part = _paths(dl, info)
|
||
part.write_bytes(b'p' * 10)
|
||
|
||
def responder(n, _url, _kw):
|
||
if n == 1:
|
||
return _FakeResponse([b'q' * 5], status=206) # 头被中间层剥离
|
||
return _FakeResponse([b'f' * 20], status=200)
|
||
|
||
session = install(responder)
|
||
|
||
r = await dl.download_music_file(101, music_info=info, retries=1)
|
||
|
||
assert r.success and len(session.calls) == 2
|
||
assert 'Range' not in _headers(session.calls[1][1])
|
||
|
||
|
||
async def test_http_416_restarts_from_scratch(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, part = _paths(dl, info)
|
||
part.write_bytes(b'p' * 10)
|
||
|
||
def responder(n, _url, _kw):
|
||
if n == 1:
|
||
return _FakeResponse([], status=416)
|
||
return _FakeResponse([b'f' * 20], status=200)
|
||
|
||
session = install(responder)
|
||
|
||
r = await dl.download_music_file(101, music_info=info, retries=1)
|
||
|
||
assert r.success and len(session.calls) == 2
|
||
assert 'Range' not in _headers(session.calls[1][1])
|
||
assert fp.read_bytes() == b'f' * 20
|
||
|
||
|
||
# ============ 失败与重试 ============
|
||
|
||
|
||
async def test_cdn_4xx_is_deterministic_and_not_retried(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
session = install(lambda a, u, kw: _FakeResponse([], status=403))
|
||
|
||
with pytest.raises(DownloadException) as ei:
|
||
await dl.download_music_file(101, music_info=info, retries=2)
|
||
|
||
assert 'HTTP 403' in str(ei.value)
|
||
assert len(session.calls) == 1, '确定性失败对同一失效直链白重试毫无意义'
|
||
|
||
|
||
async def test_408_is_retried_then_reported_as_failure(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
session = install(lambda a, u, kw: _FakeResponse([], status=408))
|
||
|
||
r = await dl.download_music_file(101, music_info=info, retries=1)
|
||
|
||
assert not r.success
|
||
assert '下载请求失败' in r.error_message
|
||
assert len(session.calls) == 2, '408 请求超时应保留可重试'
|
||
|
||
|
||
async def test_5xx_is_retried_and_keeps_part(env):
|
||
"""5xx 是服务端瞬时故障（非确定性失败）：应可重试，且保留 .part 供续传。
|
||
|
||
与 4xx 的分界在这里钉住：error 分类只看 400<=status<500，5xx 落回裸重抛，
|
||
由外层 UpstreamError 分支退避重试。此前这条路径无测试覆盖。
|
||
"""
|
||
dl, _state, install = env
|
||
info = _info(size=100)
|
||
fp, part = _paths(dl, info)
|
||
part.write_bytes(b'p' * 10)
|
||
session = install(lambda a, u, kw: _FakeResponse([], status=500))
|
||
|
||
r = await dl.download_music_file(101, music_info=info, retries=1)
|
||
|
||
assert not r.success and '下载请求失败' in r.error_message
|
||
assert len(session.calls) == 2, '5xx 非确定性失败，应重试'
|
||
assert not fp.exists(), '未交付不得留下最终文件'
|
||
assert part.stat().st_size == 10, '.part 应保留供下轮续传'
|
||
|
||
|
||
async def test_incomplete_size_keeps_part_and_reports(env):
|
||
dl, _state, install = env
|
||
info = _info(size=100)
|
||
fp, part = _paths(dl, info)
|
||
install(_body(10))
|
||
|
||
r = await dl.download_music_file(101, music_info=info, retries=0)
|
||
|
||
assert not r.success and '下载不完整' in r.error_message
|
||
assert part.exists() and part.stat().st_size == 10, '.part 应保留以供续传'
|
||
assert not fp.exists(), '不完整的下载不得转正交付'
|
||
|
||
|
||
async def test_incomplete_then_resumes_on_next_attempt(env):
|
||
dl, _state, install = env
|
||
info = _info(size=100)
|
||
_fp, part = _paths(dl, info)
|
||
|
||
def responder(n, _url, _kw):
|
||
if n == 1:
|
||
return _FakeResponse([b'a' * 10], status=200)
|
||
return _FakeResponse([b'b' * 5], status=206,
|
||
headers={'Content-Range': 'bytes 10-14/100'})
|
||
|
||
session = install(responder)
|
||
|
||
r = await dl.download_music_file(101, music_info=info, retries=1)
|
||
|
||
assert not r.success and '下载不完整' in r.error_message
|
||
assert _headers(session.calls[1][1]).get('Range') == 'bytes=10-', '下轮应续传'
|
||
assert part.stat().st_size == 15
|
||
|
||
|
||
async def test_network_error_keeps_part_for_resume(env):
|
||
"""读取期断流：真实的 iter_chunks 把 aiohttp.ClientError 收敛成
|
||
UpstreamNetworkError，外层据此保留 .part 供续传。"""
|
||
dl, _state, install = env
|
||
info = _info(size=100)
|
||
fp, part = _paths(dl, info)
|
||
|
||
install(lambda a, u, kw: _FakeResponse(
|
||
[b'a' * 10, aiohttp.ClientPayloadError('连接中断')]))
|
||
|
||
r = await dl.download_music_file(101, music_info=info, retries=0)
|
||
|
||
assert not r.success and '下载请求失败' in r.error_message
|
||
assert part.exists() and part.stat().st_size == 10, '网络错误应保留 .part'
|
||
assert not fp.exists()
|
||
|
||
|
||
# ============ 内容校验与体积上限 ============
|
||
|
||
|
||
async def test_unknown_size_non_audio_content_rejected(env):
|
||
dl, state, install = env
|
||
info = _info(size=0)
|
||
fp, part = _paths(dl, info)
|
||
state['sniff'] = False
|
||
install(lambda a, u, kw: _FakeResponse([b'<html>blocked</html>']))
|
||
|
||
with pytest.raises(DownloadException) as ei:
|
||
await dl.download_music_file(101, music_info=info)
|
||
|
||
assert '非音频数据' in str(ei.value)
|
||
assert not part.exists() and not fp.exists()
|
||
|
||
|
||
async def test_unknown_size_audio_content_accepted(env):
|
||
dl, state, install = env
|
||
info = _info(size=0)
|
||
fp, _ = _paths(dl, info)
|
||
state['sniff'] = True
|
||
install(lambda a, u, kw: _FakeResponse([b'ID3audio']))
|
||
|
||
r = await dl.download_music_file(101, music_info=info)
|
||
|
||
assert r.success and fp.read_bytes() == b'ID3audio'
|
||
|
||
|
||
async def test_size_limit_discards_part_and_fails(env, monkeypatch):
|
||
dl, _state, install = env
|
||
monkeypatch.setattr('music_downloader.downloader._MAX_DOWNLOAD_BYTES', 16)
|
||
info = _info(size=0)
|
||
fp, part = _paths(dl, info)
|
||
install(lambda a, u, kw: _FakeResponse([b'x' * 100]))
|
||
|
||
with pytest.raises(DownloadException) as ei:
|
||
await dl.download_music_file(101, music_info=info)
|
||
|
||
assert '大小上限' in str(ei.value)
|
||
assert not part.exists() and not fp.exists(), '超限残片无续传价值，须清理'
|
||
|
||
|
||
# ============ 取消 ============
|
||
|
||
|
||
async def test_cancel_before_transfer_clears_part_and_skips_network(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
_fp, part = _paths(dl, info)
|
||
part.write_bytes(b'p' * 5)
|
||
cancel = threading.Event()
|
||
cancel.set()
|
||
session = install(lambda *a: pytest.fail('已取消不应发网络请求'))
|
||
|
||
with pytest.raises(DownloadCanceled):
|
||
await dl.download_music_file(101, music_info=info, cancel_event=cancel)
|
||
|
||
assert session.calls == []
|
||
assert not part.exists(), '取消须清掉 .part'
|
||
|
||
|
||
async def test_cancel_midway_clears_half_written_file(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, part = _paths(dl, info)
|
||
cancel = threading.Event()
|
||
|
||
# 第二块产出**之前**置取消位：取消发生在迭代过程中（.part 已建立）
|
||
install(lambda a, u, kw: _FakeResponse([b'a' * 5, cancel.set, b'b' * 15]))
|
||
|
||
with pytest.raises(DownloadCanceled):
|
||
await dl.download_music_file(101, music_info=info, cancel_event=cancel)
|
||
|
||
assert not part.exists() and not fp.exists()
|
||
|
||
|
||
async def test_network_error_while_canceled_reports_canceled(env):
|
||
dl, _state, install = env
|
||
info = _info(size=20)
|
||
fp, part = _paths(dl, info)
|
||
cancel = threading.Event()
|
||
|
||
install(lambda a, u, kw: _FakeResponse([b'a' * 5, cancel.set, OSError('句柄异常')]))
|
||
|
||
with pytest.raises(DownloadCanceled):
|
||
await dl.download_music_file(101, music_info=info, cancel_event=cancel, retries=2)
|
||
|
||
assert not part.exists() and not fp.exists(), '已取消时残片没有续传价值'
|
||
|
||
|
||
async def test_cancel_after_promote_keeps_file_but_skips_metadata(env):
|
||
dl, state, install = env
|
||
info = _info(size=20)
|
||
fp, part = _paths(dl, info)
|
||
cancel = threading.Event()
|
||
|
||
def cb(written, _total):
|
||
if written >= 20:
|
||
cancel.set()
|
||
|
||
install(_body(20))
|
||
|
||
with pytest.raises(DownloadCanceled):
|
||
await dl.download_music_file(101, music_info=info, cancel_event=cancel,
|
||
progress_cb=cb)
|
||
|
||
assert fp.exists() and not part.exists(), '已转正的文件不回滚'
|
||
assert state['meta'] == [], '取消后不应再写元数据'
|
||
|
||
|
||
# ============ 元数据 ============
|
||
|
||
|
||
async def test_metadata_written_only_when_requested(env):
|
||
dl, state, install = env
|
||
install(_body(20))
|
||
|
||
await dl.download_music_file(101, music_info=_info(mid=101), write_meta=False)
|
||
assert state['meta'] == [], 'write_meta=False 不应写元数据'
|
||
|
||
r = await dl.download_music_file(102, music_info=_info(mid=102), write_meta=True,
|
||
meta_fields=['title'])
|
||
assert r.success
|
||
assert [f for _p, f in state['meta']] == [['title']], 'fields 应原样透传'
|