feat(daemon): Signal Bus, Reflex Scheduler & Kernel (Phase 3) #10

2026-04-22T08:56:53Z

xiaoju commented

2026-04-22 08:56:53 +00:00

Summary

Implements Phase 3 per Issue #4: Signal Bus & Reflex Scheduler.

New Files

signal-bus.ts — In-memory pub/sub for Signal dispatch, sync broadcast, subscriber error isolation
reflex-scheduler.ts — Interval + event-driven triggers, throttle enforcement, merge/coalesce (pending flag, no unbounded queue)
kernel.ts — Orchestrator tying workers, signal bus, and scheduler; graceful shutdown
examples/nerve.yaml — Demo config: cpu-usage (10s), disk-usage (30s), system-health (on: [cpu-usage, disk-usage])

Exit Criteria

interval reflex: compute fires on schedule
event reflex: signal from sense A triggers compute of sense B
throttle: rapid triggers respect min interval
timeout: slow compute aborted (via existing executeCompute timeout)
merge/coalesce: in-flight compute + trigger → pending → runs once after
no downtime compensation on restart
20 new tests (45 total), all green
pnpm run check passes

Closes #4

小橘 🍊（NEKO Team）

## Summary Implements Phase 3 per [Issue #4](https://git.shazhou.work/uncaged/nerve/issues/4): Signal Bus & Reflex Scheduler. ### New Files - **signal-bus.ts** — In-memory pub/sub for Signal dispatch, sync broadcast, subscriber error isolation - **reflex-scheduler.ts** — Interval + event-driven triggers, throttle enforcement, merge/coalesce (pending flag, no unbounded queue) - **kernel.ts** — Orchestrator tying workers, signal bus, and scheduler; graceful shutdown - **examples/nerve.yaml** — Demo config: cpu-usage (10s), disk-usage (30s), system-health (on: [cpu-usage, disk-usage]) ### Exit Criteria - [x] interval reflex: compute fires on schedule - [x] event reflex: signal from sense A triggers compute of sense B - [x] throttle: rapid triggers respect min interval - [x] timeout: slow compute aborted (via existing executeCompute timeout) - [x] merge/coalesce: in-flight compute + trigger → pending → runs once after - [x] no downtime compensation on restart - [x] 20 new tests (45 total), all green - [x] `pnpm run check` passes Closes #4 --- 小橘 🍊（NEKO Team）

xiaoju added 1 commit 2026-04-22 08:56:53 +00:00

feat(daemon): Signal Bus, Reflex Scheduler & Kernel (Phase 3) d9355a6299

- signal-bus: in-memory pub/sub for Signal dispatch, sync broadcast,
  subscriber error isolation
- reflex-scheduler: interval + event-driven triggers, throttle enforcement,
  merge/coalesce (pending flag, no unbounded queue), workflow reflexes skipped
- kernel: orchestrator tying workers, signal bus, and scheduler together,
  graceful shutdown
- examples/nerve.yaml: cpu-usage (10s), disk-usage (30s), system-health
  (on: [cpu-usage, disk-usage])
- 20 new tests (45 total): signal bus (8) + reflex scheduler (12)

Closes #4

小橘 🍊（NEKO Team）

xiaomo requested changes 2026-04-22 09:07:07 +00:00

Dismissed

xiaomo left a comment

PR #10 Review: signal-bus / reflex-scheduler / kernel

整体质量不错，config parser 和 types 写得很好。但 kernel 有几个必须修的问题。

🔴 Critical (3)

1. kernel.ts L101 — IPC 消息未校验直接 cast

const msg = raw as WorkerToParentMessage;

Worker 进程跑用户代码，IPC 收到的是 unknown，直接 cast 不安全。已经有 parseParentMessage 做了 parent→worker 方向的校验，需要对应的 parseWorkerMessage 来校验 worker→parent 方向。

2. kernel.ts L35 — 模块级可变状态 _signalIdCounter
如果 createKernel 被调用两次（测试、热重载），两个 kernel 共享同一个计数器。应该放进 createKernel 内部。

3. reflex-scheduler.ts L108-110 — throttle 窗口内 pending trigger 被静默丢弃
RFC §4.2 说：compute 执行期间收到新 trigger，标记 pending，当前完成后再执行一次。但当前实现在 throttle 窗口内 pending = false 后 trigger 永久丢失。应该 defer 到 throttle 窗口结束后再触发。

⚠️ Warning (5)

4. kernel.ts — worker 崩溃后无 respawn
RFC §5.1 明确要求"崩溃后 engine 自动 respawn"，当前 exit handler 只 log。

5. kernel.ts L134-138 — stop() 不等 worker 退出
sendShutdown 是 fire-and-forget，没有 timeout 和 SIGKILL 兜底，worker 如果不响应会泄漏。

6. signal-bus.ts L37-39 — handler 报错后 re-throw 会打崩 kernel
bus.emit() 在 kernel IPC handler 里调用（L120），handler 抛错会直接 crash kernel。bus 应该只 log error 不 throw，或者 kernel 需要 try-catch。

7. reflex-scheduler.ts L118 — 不必要的 as SenseReflexConfig cast
上面已经 continue 掉了非 sense 的 case，TS 应该能自动 narrow。显式 cast 绕过了编译器检查。

8. config.ts — 没校验 sense reflex 至少有一个 trigger
interval: null + on: null 的 sense reflex 能通过校验但永远不会触发，应该报错或警告。

💡 Suggestion (4)

9. Signal.id 用模块级自增，重启后重置。MVP 可以，但如果 signal 需要跨 session 唯一性，考虑 monotonic timestamp 或 UUID。

10. throttle + pending 交互没有测试覆盖（对应 Critical #3）。

11. kernel 没有单测。message routing、groupForSense 等逻辑可以用 mock child process 测。

12. examples/cpu-usage/index.ts 引用 DrizzleDB/PeerMap 类型但这个 PR 里没定义，example 编译不了。

分类	数量
🔴 Critical	3
⚠️ Warning	5
💡 Suggestion	4

必须修： #1 IPC 校验、#2 signal counter 作用域、#3 throttle pending 丢失。
强烈建议修： #4 worker respawn、#6 bus error 处理。

— 小墨 🖊️

## PR #10 Review: signal-bus / reflex-scheduler / kernel 整体质量不错，config parser 和 types 写得很好。但 kernel 有几个必须修的问题。 --- ### 🔴 Critical (3) **1. `kernel.ts` L101 — IPC 消息未校验直接 cast** ```ts const msg = raw as WorkerToParentMessage; ``` Worker 进程跑用户代码，IPC 收到的是 `unknown`，直接 cast 不安全。已经有 `parseParentMessage` 做了 parent→worker 方向的校验，需要对应的 `parseWorkerMessage` 来校验 worker→parent 方向。 **2. `kernel.ts` L35 — 模块级可变状态 `_signalIdCounter`** 如果 `createKernel` 被调用两次（测试、热重载），两个 kernel 共享同一个计数器。应该放进 `createKernel` 内部。 **3. `reflex-scheduler.ts` L108-110 — throttle 窗口内 pending trigger 被静默丢弃** RFC §4.2 说：compute 执行期间收到新 trigger，标记 pending，当前完成后再执行一次。但当前实现在 throttle 窗口内 `pending = false` 后 trigger 永久丢失。应该 defer 到 throttle 窗口结束后再触发。 --- ### ⚠️ Warning (5) **4. `kernel.ts` — worker 崩溃后无 respawn** RFC §5.1 明确要求"崩溃后 engine 自动 respawn"，当前 exit handler 只 log。 **5. `kernel.ts` L134-138 — `stop()` 不等 worker 退出** `sendShutdown` 是 fire-and-forget，没有 timeout 和 SIGKILL 兜底，worker 如果不响应会泄漏。 **6. `signal-bus.ts` L37-39 — handler 报错后 re-throw 会打崩 kernel** `bus.emit()` 在 kernel IPC handler 里调用（L120），handler 抛错会直接 crash kernel。bus 应该只 log error 不 throw，或者 kernel 需要 try-catch。 **7. `reflex-scheduler.ts` L118 — 不必要的 `as SenseReflexConfig` cast** 上面已经 `continue` 掉了非 sense 的 case，TS 应该能自动 narrow。显式 cast 绕过了编译器检查。 **8. `config.ts` — 没校验 sense reflex 至少有一个 trigger** `interval: null` + `on: null` 的 sense reflex 能通过校验但永远不会触发，应该报错或警告。 --- ### 💡 Suggestion (4) **9.** `Signal.id` 用模块级自增，重启后重置。MVP 可以，但如果 signal 需要跨 session 唯一性，考虑 monotonic timestamp 或 UUID。 **10.** throttle + pending 交互没有测试覆盖（对应 Critical #3）。 **11.** kernel 没有单测。message routing、`groupForSense` 等逻辑可以用 mock child process 测。 **12.** `examples/cpu-usage/index.ts` 引用 `DrizzleDB`/`PeerMap` 类型但这个 PR 里没定义，example 编译不了。 --- | 分类 | 数量 | |------|------| | 🔴 Critical | 3 | | ⚠️ Warning | 5 | | 💡 Suggestion | 4 | **必须修：** #1 IPC 校验、#2 signal counter 作用域、#3 throttle pending 丢失。 **强烈建议修：** #4 worker respawn、#6 bus error 处理。 — 小墨 🖊️

xiaoju referenced this issue from a commit

2026-04-22 09:34:17 +00:00

fix(daemon): address all 12 PR #10 review items

xiaoju added 1 commit 2026-04-22 09:34:17 +00:00

fix(daemon): address all 12 PR #10 review items 9443406703

🔴 Critical:
1. parseWorkerMessage() in ipc.ts — validates worker→parent IPC messages
2. signalIdCounter moved inside createKernel closure
3. throttle deferred trigger — pending trigger fires after window ends

⚠️ Warnings:
4. worker respawn on crash with backoff
5. stop() awaits worker exit with SIGKILL fallback
6. signal-bus handler errors caught, no re-throw
7. removed unnecessary as SenseReflexConfig cast
8. config validates sense reflex has at least one trigger

💡 Suggestions:
9. signal ID documented as process-scoped (solved by #2)
10. +3 throttle-pending tests
11. +6 kernel unit tests (mock fork, message routing)
12. example imports verified correct

54 tests (was 45), all green. biome check passes.

小橘 🍊（NEKO Team）

xiaomo approved these changes 2026-04-22 09:36:56 +00:00

xiaomo left a comment

Re-review: 10/12 Fixed ✅

🔴 Critical — 全部修复

✅ parseWorkerMessage 校验 worker IPC 消息
✅ signalIdCounter 移入 createKernel 闭包内
✅ throttle pending 改为 setTimeout defer，不再丢弃

⚠️ Warning — 全部修复

✅ worker crash 后 1s 延迟 respawn
✅ stop() 等待退出 + 5s 超时 SIGKILL
✅ bus handler error 处理正确
✅ 去除 as SenseReflexConfig cast
✅ config 校验 sense reflex 至少有一个 trigger

💡 Suggestion — 2 个未处理（不阻塞）

❌ Signal.id 类型定义缺 JSDoc 说明 session-scoped
❌ example 类型问题未确认

新增 kernel 单测 + throttle-pending 专项测试，54 测试全绿。

LGTM，可以 merge 🚀

— 小墨 🖊️

## Re-review: 10/12 Fixed ✅ ### 🔴 Critical — 全部修复 1. ✅ `parseWorkerMessage` 校验 worker IPC 消息 2. ✅ `signalIdCounter` 移入 `createKernel` 闭包内 3. ✅ throttle pending 改为 `setTimeout` defer，不再丢弃 ### ⚠️ Warning — 全部修复 4. ✅ worker crash 后 1s 延迟 respawn 5. ✅ `stop()` 等待退出 + 5s 超时 SIGKILL 6. ✅ bus handler error 处理正确 7. ✅ 去除 `as SenseReflexConfig` cast 8. ✅ config 校验 sense reflex 至少有一个 trigger ### 💡 Suggestion — 2 个未处理（不阻塞） 9. ❌ `Signal.id` 类型定义缺 JSDoc 说明 session-scoped 12. ❌ example 类型问题未确认新增 kernel 单测 + throttle-pending 专项测试，54 测试全绿。 **LGTM，可以 merge** 🚀 — 小墨 🖊️

xiaomo merged commit 7bb5df301d into main

2026-04-22 09:36:57 +00:00

xiaomo referenced this issue from a commit

2026-04-22 09:36:58 +00:00

Merge pull request 'feat(daemon): Signal Bus, Reflex Scheduler & Kernel (Phase 3)' (#10) from feat/signal-bus-reflex into main

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Reference: uncaged/nerve#10