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docs/rfc/implemented/process/2026-07-06-parallel-pre-push-gates.md # docs/rfc/implemented/process/2026-07-12-package-model-experience-contract.md # docs/rfc/implemented/simplification/2026-06-20-remove-agent-boundary-mirror-events.md # docs/rfc/implemented/simplification/2026-07-04-prune-producerless-vocabulary-variants.md # docs/rfc/implemented/testing/2026-06-20-remove-redundant-snapshot-log-goldens.md # docs/rfc/implemented/testing/2026-07-08-shared-acp-snapshot-package.md # docs/rfc/proposed/architecture/2026-06-20-generic-long-running-tool-runtime.md # docs/rfc/proposed/simplification/2026-06-20-unify-agent-and-session-id.md # docs/rfc/proposed/simplification/2026-07-12-simplify-session-log-representation.md # docs/rfc/rejected/simplification/2026-07-04-prune-unimplemented-subagent-vocabulary.md # scripts/translation-pairing.manifest.json
10 KiB
RFC: 共享的超时/截止时间原语,硬终止留给各能力自行实现
Status: implemented
English | 中文
问题
超时处理在各个承载工具的能力之间逐渐分化,而且这种分化并非表面的:同一套逻辑被以三种方式重新实现,各自带有微妙的正确性负担。
- bash(packages/bash/bash-local/src/run.ts)在进程管道内部有一套完整、正确的超时实现:一个经配置钳位的
timeoutMs,两个独立触发器(用于超时的killTimer和用于上游取消的onAbort监听器),各自调用同一个kill()闭包对进程组执行 SIGTERM→宽限期→SIGKILL 升级,以及两个正交的结果布尔值(timedOut、aborted)独立锁存。 - web_fetch(packages/web/web-fetch-local/src/provider.ts)有一套正确但手写的超时:构造一个
AbortController,连接setTimeout(() => controller.abort(new WebError(…, 'WEB_FETCH_TIMEOUT'))),手动添加和移除上游信号监听器,在finally中清除定时器,并在translateAbortOrNetwork辅助函数中从signal.reason恢复超时原因(因为 reader 只抛出裸AbortError)。 - web_search(packages/web/tool-web/src/search.ts)完全没有超时:
WebSearchRequest(packages/web/web/src/types.ts)不携带timeoutMs字段,各提供方的search()只转发exec.signal。(web_search 在本次设计中保持无超时——见「后果」。)
每个新的外部进程或网络工具都要重新推导同样四件事:钳位请求值、启动定时器、将超时与上游取消融合、在出口处区分「超时」与「已取消」。而融合与原因恢复恰恰是最容易出微妙错误的部分(web_fetch 的 signal.reason 处理就是证据)。与此同时,各能力执行的终止操作不可归约地不同:bash 杀死一个 OS 进程组(工作运行在子进程中,在本运行时之外,只能通过信号触达),而 web 中止一个进程内的 fetch(undici 拆除 socket)。不存在一个能停止所有能力工作的单一机制。
决策
@deepseek-ai/dsh-timeout 位于 packages/util/(与 dsh-brand 同级),负责超时的计时与分类这一半;终止那一半——硬终止——留在各能力的实现中。它是一个纯函数库,不是 Cordis 服务或插件:不接收 ctx、不注册任何东西、不持有跨调用状态、不发射事件。这里刻意不设中央「超时服务」,因为那样的服务必须知道如何停止每个能力的工作——而这正是微内核要排除在共享层之外的知识,也是 Codex 将 ExecExpiration 限定于 exec 族所示范的原则。
库的对外接口
三个函数加一个 reason 类型:
/** The internal reason attached to a timeout abort, so consumers can classify it after the fact. */
export class TimeoutReason extends Error {
override name = 'TimeoutReason'
constructor(readonly code: string, readonly timeoutMs: number) {
super(`${code} after ${timeoutMs}ms`)
}
}
/** Validate/fill a caller's optional positive hint from the backend's default, then cap at its max. */
export function clampTimeout(
requested: number | undefined,
def: number,
max: number,
name = 'timeoutMs',
): number
/**
* Build a deadline signal that aborts on upstream cancellation OR on timeout,
* with the timeout carrying a `TimeoutReason`. `timeoutMs <= 0` means "no
* timeout" (background tasks): forward only the upstream signal, arm no timer.
* The returned object's `[Symbol.dispose]` clears the timer — `using` for a
* scope-lifetime consumer, a manual call for an event-lifetime one.
*/
export function deadline(
upstream: AbortSignal | undefined,
timeoutMs: number,
code: string,
): { signal: AbortSignal; [Symbol.dispose](): void }
/** Recover the TimeoutReason from an aborted signal (or error); `code` scopes the match to this deadline's timer. */
export function timeoutOf(x: AbortSignal | { reason?: unknown }, code?: string): TimeoutReason | undefined
deadline 通过 AbortSignal.any 将上游信号与定时器融合,附加一个类型化的 TimeoutReason,并暴露可 dispose(资源释放)的定时器清理。非正数超时是内部的「无超时」哨兵,用于后端拥有的后台任务;外部提示经过 clampTimeout,必须为正有限值。既无定时器也无上游信号时,函数返回一个永不中止的信号,具有相同的 disposal 形状。提供方将超时原因转译为 seam 特定的结果。timeoutOf(signal, code) 限定分类范围,使外层嵌套的 deadline 被视为上游取消而非内层能力自身的超时。
职责划分
| 关注点 | 负责方 |
|---|---|
| 校验请求提示并钳位默认值/最大值 | dsh-timeout(clampTimeout):纯算术加共享的正有限请求契约 |
| 启动定时器、到期中止、携带 reason、与上游取消融合 | dsh-timeout(deadline) |
| 清除定时器 | dsh-timeout([Symbol.dispose]) |
| 中止后对首个 abort reason 进行分类 | dsh-timeout(timeoutOf) |
| 实际终止工作 | 各能力的实现 |
| 默认值/最大值数值 | 各能力的配置 |
超时 code 字符串 |
各能力(WEB_FETCH_TIMEOUT ≠ BASH_TIMEOUT) |
信号只通知;终止始终是监听方的职责,而监听方因能力而异。bash 自行编写 addEventListener('abort', kill),因为 OS 进程存在于本运行时之外,没有别的东西会杀死它;web 将 d.signal 交给 fetch,由 undici 拆除 socket。这也是文件读/写/编辑不接受 timeoutMs 的原因:本地系统调用最多只能尽力中止,超时无法强制 fsync/rename 停止,添加超时将是一个违反「显式优于隐式」的隐式默认值。两个参考 agent 出于同样的原因对文件 I/O 不设超时。
各能力如何消费该库
- web_fetch:工具层保持校验并转发;提供方手写的 controller +
setTimeout+ 手动监听器 +finally+signal.reason恢复被替换为提供方自有的deadline/timeoutOf。已预先中止的上游信号仍然立即抛出WEB_ABORTED;否则fetch使用融合后的d.signal运行,translateAbortOrNetwork根据信号分类抛出的错误(timeoutOf→WEB_FETCH_TIMEOUT,否则已中止 →WEB_ABORTED,否则网络错误 →WEB_PROVIDER_ERROR)。公开的错误码契约不变,TimeoutReason永远不会作为公开错误跨越 web seam。 - bash:
resolve()将请求钳位为显式规格。前台run()创建 deadline 并将其信号传给进程执行,后者既有的 abort 监听器执行进程组 kill。执行器将首个 abort 分类为超时或取消。后台启动保持无超时,仅转发上游取消。
后果
runBash的结果不再独立锁存timedOut和aborted;超时与用户中止在进程关闭前竞争时,现在报告单一的首个 abort 原因,而非两者同时为 true。统一的 SIGTERM→宽限期→SIGKILL 终止路径不变,seam 类型BashRunResult保留两个布尔值(现在互斥),因此dsh-tool-bash的结果渲染不受影响。SpawnSpec.timeoutMs和SpawnOutcome.timedOut/aborted被移除,而非作为始终为零/始终为 false 的残余保留:由于runBash不再拥有定时器且执行器负责分类,这些字段无处被读取。这是与字面提案形状(向runBash传入timeoutMs: 0)的唯一偏差;一个始终为 0 且无处读取的字段在逐文件覆盖率门禁下属于死代码。- web_fetch 去除了其定制的 controller/timer/listener/reason-recovery;分类器现在基于 deadline 信号(
timeoutOf+aborted)而非抛出错误的形状来判断,这在请求阶段的 reject-with-reason 和读取阶段的裸AbortError两种情况下都是健壮的。 AbortSignal.any和using/Symbol.dispose在此首次进入本仓库(Node ≥ 24 基线,已满足)。
以下内容不在本次范围内,列出以标明边界:web_search 可以在其 tool-schema/snapshot 覆盖率规划就绪后获得可选的面向模型的 timeout_ms;未来基于 ripgrep 的文件系统发现工具可以在存在后消费同样的提供方自有 deadline 形状;tools/execute waterfall(瀑布式事件)中间件可以通过驱动 exec.signal 为每次工具调用设置默认 deadline——那将是一个消费本库的插件,仍然只做通知,硬终止仍是各能力自己的事。
曾考虑的替代方案
统一的超时插件 / ctx.timeout 服务。 基于微内核原则否决。一个能停止任何工具工作的服务必须理解每个能力的终止机制(进程组 SIGKILL、socket 拆除、系统调用边界检查),这正是架构所禁止的「内核知道太多」。Codex 的 ExecExpiration 被限定于 exec 族,正是因为它驱动的 kill(killpg)是进程族特有的;MCP 和 model-stream 各自保有自己的。不存在一个连贯的中间层能为所有东西拥有终止权,因此共享部分只能是纯计时/分类那一半——一个库,而非服务。
每个工具各自实现超时,不共享代码(先前的现状,也是 Claude Code 的选择)。 否决,因为它已经在产生分化和重复的正确性负担:web_fetch 手写了与未来网络/进程类工具各自需要重新推导的完全相同的 controller/reason 逻辑,而融合 + signal.reason 恢复正是容易出错的部分。Claude Code 容忍完全重复;本仓库有一个统一的共享 abort 通道(每次 execute 上的 exec.signal),使得一个小型共享原语严格更优,因此成本/收益不同。
用 withTimeout(promise, ms) 包装器代替信号工厂。 否决,因为让 promise 与定时器竞争只是在截止时间到达时 resolve 工具调用的 promise,而不会停止底层工作——子进程或 fetch socket 会泄漏。分发信号并要求能力监听,才能强制一条真实的终止路径存在。这与「dispose 必须达到静止状态,而非仅仅请求它」的防御性规则一致。
保留 bash 独立的超时和取消触发器。 否决,因为一个 deadline 信号移除了定制定时器并标准化了分类。竞争的原因报告先到达的那个 abort,而既有的 SIGTERM→SIGKILL 终止路径保持不变。