feat(m193): 下载并发/重试/gh-proxy 真接进引擎(schema 与引擎同源常量)
- download.concurrency / download.retry_limit 以前引擎侧零消费者(恒用 EngineConfig::default() 的 64,而 schema 说 8)。现在默认值与硬上限收成 download/config.rs 的常量,schema、EngineConfig::default()、Semaphore 容量 三处同源;宿主把三个键翻译成 DownloadTuning 后经 shared::set_tuning(按数据根) 灌进装配点,改了设置下一次取引擎就生效。 - download.gh_proxy 三态(留空=跟随内置默认 / off=关 / 前缀=覆盖)下沉到 shared::build,所有走共享引擎的下载路径(内容库/版本清单/字体/安装)一致。 - 删掉 MirrorTable::set_gh_proxy 与 default_gh_proxy 两个改了没用的入口。 - 下载设置页把三条假演示值换成说语义的中文行(含三态说明与 1~64 硬上限)。 - 守卫:探针读 Semaphore 真实许可数(不是读配置),每条配变异证明。 - docs/download-settings.md 记下取证表(另四个键仍零消费,已立 finding)。
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//! 设置页「下载」分组 + 下载调优的**宿主侧翻译**(M193)。
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//!
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//! ## 为什么单开一个文件
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//!
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//! 同 `host/settings_tests.rs` 的理由:`host/settings.rs` 正好顶在 400 行硬线上,而本轮要往这一组加
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//! 「`download.gh_proxy` 三态行 + 并发硬上限说明 + 调优翻译」约 24 行。不拆就得砍 `settings.rs` 里
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//! 那些**留着防复发**的论证注释(`ai_group` 的 M174 回归说明、`parse_value` 的 P1-1 浮点键事故)
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//! ——那比多一个文件糟得多。搬出来还有一个附带好处:这一组是**唯一**要往 core 灌下载调优的一组,
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//! 代码与它的守卫(`settings_tests.rs`)现在挨在一起。
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//!
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//! ## 谁在读 / 谁在写
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//!
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//! ```text
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//! config/launcher.json ←── store.set(`settings::set`,本模块只读)
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//! download.concurrency ─┐
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//! download.retry_limit ─┼─→ DownloadTuning(core 决定默认值与夹取)─→ shared::set_tuning
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//! download.gh_proxy ───┘ (引擎重建时生效)
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//! ```
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//!
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//! **调优的同步点是显式的**:`host/engine.rs` 每次取引擎前、`dispatch.rs` 的 `SetSetting` 分支里,
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//! 都调 [`apply_tuning`](幂等:值没变就什么都不做)。它**不是**藏在某个读函数里的副作用——
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//! 「读起来是纯读、实际改全局状态」正是本仓吃过亏的那类形状。
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use unlucky_core::download::config::{
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DownloadTuning, DEFAULT_MAX_ATTEMPTS_PER_SOURCE, DEFAULT_MAX_CONCURRENCY,
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};
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use unlucky_core::download::shared;
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use crate::dto::{SettingGroupView, SettingRowView};
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use super::super::env::HostEnv;
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use super::{int, selected, text};
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/// 并发数的推荐档位(`selected()` 找不到时回 0;手改出来的非档位值会被插进选项表,见 [`group`])。
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const CONCURRENCY_LADDER: [&str; 5] = ["4", "8", "16", "32", "64"];
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/// 单源尝试次数的推荐档位。
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const RETRY_LADDER: [&str; 5] = ["1", "2", "3", "5", "10"];
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/// 下载(D7):并发/重试/地区/镜像偏好/代理/GitHub 加速前缀。
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pub(super) fn group(env: &HostEnv) -> SettingGroupView {
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let concurrency = int(
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env,
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unlucky_core::download::config::KEY_CONCURRENCY,
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DEFAULT_MAX_CONCURRENCY as i64,
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)
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.to_string();
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let retry = int(
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env,
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unlucky_core::download::config::KEY_RETRY_LIMIT,
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i64::from(DEFAULT_MAX_ATTEMPTS_PER_SOURCE),
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)
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.to_string();
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let concurrency_options = ladder(&CONCURRENCY_LADDER, &concurrency);
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let retry_options = ladder(&RETRY_LADDER, &retry);
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let concurrency_options: Vec<&str> = concurrency_options.iter().map(String::as_str).collect();
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let retry_options: Vec<&str> = retry_options.iter().map(String::as_str).collect();
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let regions = ["auto", "cn", "global"];
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let mirrors = ["auto", "official", "mirror"];
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let proxies = ["none", "system", "manual"];
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let region_value = text(env, "download.region");
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let mirror_value = text(env, "download.mirror_preference");
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let proxy_value = text(env, "download.proxy_mode");
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SettingGroupView::new("download", "下载与镜像(D7)")
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.with(SettingRowView::choice(
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unlucky_core::download::config::KEY_CONCURRENCY,
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"并发数",
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"同时下载的文件数:出厂 8,可调 1~64(引擎硬上限 64,防止填 9999 把机器拖死);越界或手改坏值按出厂值生效",
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&concurrency_options,
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selected(&concurrency_options, &concurrency),
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))
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.with(SettingRowView::choice(
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unlucky_core::download::config::KEY_RETRY_LIMIT,
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"单源尝试次数",
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"同一个源最多试几次(含首次;出厂 3)。换源不受此限:候选链上有几个源就各给几次",
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&retry_options,
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selected(&retry_options, &retry),
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))
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.with(SettingRowView::choice(
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"download.region",
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"地区判定",
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"auto = 时区+语言+探测;决定是否优先国内镜像",
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®ions,
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selected(
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®ions,
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if region_value.is_empty() {
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"auto"
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} else {
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®ion_value
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},
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),
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))
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.with(SettingRowView::choice(
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"download.mirror_preference",
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"镜像偏好",
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"auto = 按健康度评分;official = 官方源优先",
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&mirrors,
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selected(
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&mirrors,
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if mirror_value.is_empty() {
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"auto"
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} else {
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&mirror_value
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},
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),
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))
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.with(SettingRowView::choice(
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"download.proxy_mode",
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"代理模式",
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"none / system(跟随系统)/ manual(下面填地址)",
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&proxies,
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selected(
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&proxies,
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if proxy_value.is_empty() {
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"none"
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} else {
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&proxy_value
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},
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),
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))
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.with(SettingRowView::text(
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"download.proxy_url",
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"HTTP 代理",
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"manual 模式生效;留空则用系统代理",
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&text(env, "download.proxy_url"),
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))
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// M193:gh-proxy 三态。**留空与 off 是两件事**,描述里必须都写出来——用户最容易把
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// 「我还没决定」当成「我不要加速」,于是以为自己关掉了、实际还在套前缀。
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.with(SettingRowView::text(
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unlucky_core::download::config::KEY_GH_PROXY,
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"GitHub 加速前缀(gh-proxy)",
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"留空 = 跟随内置默认(镜像优先/国内判定时自动套 gh-proxy.com);填 off = 关闭(不生成任何 gh-proxy 候选);填一个 URL 前缀 = 覆盖它",
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&text(env, unlucky_core::download::config::KEY_GH_PROXY),
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))
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.with(SettingRowView::action(
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super::super::engine::DETECT_REGION_ACTION,
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"重新检测地区",
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"清掉 24h 地区缓存,下次下载重新判定",
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"detect_region",
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))
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}
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/// 推荐档位 + 「当前值不在档位里就把它插进去」(否则这一行会把 2 显示成 4 —— 又一个假值)。
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fn ladder(ladder: &[&str], current: &str) -> Vec<String> {
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let mut options: Vec<String> = ladder.iter().map(|item| (*item).to_string()).collect();
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if !current.is_empty() && !options.iter().any(|option| option == current) {
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options.push(current.to_string());
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options.sort_by_key(|option| option.parse::<i64>().unwrap_or(i64::MAX));
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}
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options
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}
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/// 从 `launcher.json` 读出下载调优(默认值与夹取口径在 core,本函数只做「取原始值」)。
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#[must_use]
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pub(crate) fn tuning_of(env: &HostEnv) -> DownloadTuning {
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use unlucky_core::download::config::{KEY_CONCURRENCY, KEY_GH_PROXY, KEY_RETRY_LIMIT};
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let store = env.store();
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let doc = store.doc();
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let gh = doc
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.effective_str(KEY_GH_PROXY)
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.map(str::to_string)
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.unwrap_or_default();
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DownloadTuning::from_settings(
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doc.effective_i64(KEY_CONCURRENCY),
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doc.effective_i64(KEY_RETRY_LIMIT),
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Some(gh.as_str()),
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)
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}
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/// 把当前设置灌进 core 的下载调优(按数据根),返回**是否真的变了**(变了就失效该根的引擎)。
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///
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/// 幂等:值没变时 `shared::set_tuning` 一行不动,所以「每次取引擎前都调」是安全的。
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pub(crate) fn apply_tuning(env: &HostEnv) -> bool {
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shared::set_tuning(env.layout.cache(), tuning_of(env))
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}
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