docs(plan): add chat state machine refactor design
Update implementation_plan.md with a detailed refactor plan that splits `chatInitActor` into two independent actors (`loadQuotaActor` + `loadHistoryActor`) and redesigns the history loading flow to follow local → network → save semantics so the UI sees local data first, then network data. Key changes outlined in the plan: - Add new events: `ChatQuotaLoaded`, `ChatHistoryLocalLoaded`, `ChatHistoryNetworkLoaded`, `ChatHistorySyncDone` - Remove dead-code `ChatInit` event - Extend `ChatState` with `quotaLoaded` and `historyLoaded` flags - Use an `always` barrier in `guestSession.initializing` and `userSession.initializing` so both tasks must complete before transitioning to `ready` - Guest init runs `loadQuota` + `loadHistory` in parallel; non-guest init runs `chatWebSocket` + `loadHistory` as independent tasks Also adds `implementation_plan` to .gitignore.
This commit is contained in:
+397
-4
@@ -258,11 +258,11 @@ WebAuthPlatform (plain TS) AuthPlatformBridge ("use client")
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│ │ store requestId │ ────────────▶ │ window.google.accounts │
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│ │ → resolver │ │ .id.initialize({...}) │
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│ └─ return Promise │ │ on auth event: │
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│ │ resolveGoogle │ window.google.accounts│
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│ resolveGoogle( │ ◀──────────── │ .id.prompt() │
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│ requestId, result)│ │ GIS callback: │
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│ │ │ window.google.accounts│
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│ resolveGoogle( │ resolveGoogle │ .id.prompt() │
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│ requestId, result)│ ◀──────────── │ GIS callback: │
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└──────────────────────┘ │ resolve the promise │
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└──────────────────────────┘
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└──────────────────────────┘
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```
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- `WebAuthPlatform` 暴露公开方法 `resolveGoogle(requestId, result)` / `resolveFacebook(...)` 给 Bridge 回写 Promise
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@@ -581,3 +581,396 @@ const handleGoogle = () => authDispatch({ type: "AuthGoogleLoginSubmitted" });
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5. **`auth-context.tsx`**：检查 `isLoading` 表达式是否覆盖 `loadingOAuth`——需要把 `state.matches("loadingOAuth")` 加进去
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6. **验证**：`npx tsc --noEmit` + `pnpm lint` + dev server smoke
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7. **可选清理**：`src/lib/auth/nextauth.ts` 的 `export { AuthPlatform, type AuthProvider }` 改为仅在 auth_repository / 其他内部消费者使用；如果没有别的 import，可保留
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---
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# 重构 Chat 状态机：init 拆为 2 独立任务 + history local→network→save
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## [Overview]
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把 `chatInitActor`（一个**怪**聚合了**配**额 + 本地 history **两**件事的 actor）**拆**成**两**个**独**立 actor（`loadQuotaActor` + `loadHistoryActor`），**每**个**都**是**独**立函数 / 独立 actor。游客**登**录 init 跑 `loadQuota + loadHistory` **两**个**并**行任务；**非**游客 init 跑 `chatWebSocket`（parent） + `loadHistory`（initializing）**两**个**独**立任务。**重**点：**history task 内部**走** `读 local → 派 events 到 UI → 读 network → 派 events 到 UI → 写 local` 3 步，UI 顺**序**看**到** local → network。
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## [需求（**用**户**原**话）]
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> 游客登录初始化，两个任务：一是加载配额，第二个是拉取历史消息
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> 非游客登录也是两个任务。一是连接 websocket，二是拉取历史消息
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> 每个任务都要独立，都要独立的函数
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> 拉取历史消息的逻辑是：先从本地拉取，展示到界面上，再从网络拉取，展示到界面上，再用网络数据覆盖本地数据
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## [Types]
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### ChatEvent 增量（`src/stores/chat/chat-events.ts`）
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```typescript
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// 新增
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| { type: "ChatQuotaLoaded"; remaining: number; total: number }
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| { type: "ChatHistoryLocalLoaded"; messages: UiMessage[] }
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| { type: "ChatHistoryNetworkLoaded"; messages: UiMessage[]; hasMore: boolean; newOffset: number }
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| { type: "ChatHistorySyncDone" } // local 已被 network 数据覆盖
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// 删**除**
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| { type: "ChatInit" } // **死**代码（chat-machine **没** handler）
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```
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### ChatState 增量（`src/stores/chat/chat-state.ts`）
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```typescript
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export interface ChatState {
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// ... 既有字段 ...
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/** 游客配额是否加载完成（**仅** guestSession 期间） */
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quotaLoaded: boolean; // ← 新增（default false）
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/** 历史是否加载完成（local → network → save 都跑完） */
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historyLoaded: boolean; // ← 新增（default false）
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}
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```
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## [Files]
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### 修改
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| 路径 | 变更 |
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|---|---|
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| `src/stores/chat/chat-events.ts` | 加 4 个新事件；删 `ChatInit` |
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| `src/stores/chat/chat-state.ts` | 加 `quotaLoaded: boolean` + `historyLoaded: boolean`（default false） |
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| `src/stores/chat/chat-machine.helpers.ts` | 删 `readInitData`；加 `readGuestQuota()` + `readAndSyncHistory({ sendBack })` |
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| `src/stores/chat/chat-machine.actors.ts` | 删 `chatInitActor`；加 `loadQuotaActor`（fromPromise）+ `loadHistoryActor`（fromCallback，sendBack 3 事件） |
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| `src/stores/chat/chat-machine.ts` | 重构 `guestSession.initializing` + `userSession.initializing`；注册新 actors；处理新事件；加 `always` barrier |
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| `src/stores/chat/chat-context.tsx` | 暴露 `quotaLoaded` / `historyLoaded` 到 context（如果 UI 需要） |
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### 不变
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- `loadMoreHistoryActor` —— 翻页仍用 fromPromise + 纯 server fetch（**不**改 local-first，**不**在**本**轮 scope）
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- `sendMessageHttpActor` —— **不**动
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- `chatWebSocketActor` —— **不**动（**已**是 fromCallback + cleanup，**已**是独立函数）
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### 删除
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- `chat-machine.ts` `guestSession.loadingMore` 子**状**态**（**游**客**无**服**务**端** history，**不****支**持**翻**页**）
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- `chatInitActor`（**被** 2 **个**新 actor **替**换**）
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- `readInitData`（**被** 2 **个**新 helper **替**换**）
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- `ChatInit` 事件（**死**代码，**无**消费者**）
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## [Functions]
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### 新增
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| 函数 | 签名 | 文件 | 用途 |
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|---|---|---|---|
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| `readGuestQuota()` | `() => Promise<{ remaining: number; total: number }>` | `chat-machine.helpers.ts` | 读**客** ChatStorage 游客**日**配 + 总**配**（**纯** local） |
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| `readAndSyncHistory({ sendBack })` | `({ sendBack: (e: ChatEvent) => void }) => Promise<void>` | `chat-machine.helpers.ts` | 3 步：读 local → sendBack → 读 network → sendBack → save network 到 local → sendBack |
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| `loadQuotaActor` | `fromPromise<{ remaining, total }>` | `chat-machine.actors.ts` | 包装 `readGuestQuota` |
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| `loadHistoryActor` | `fromCallback<ChatEvent, void>` | `chat-machine.actors.ts` | 包装 `readAndSyncHistory`（**用** fromCallback **因**为**要** 3 **次** sendBack） |
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### 删除
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| 函数 | 文件 | 原**因** |
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|---|---|---|
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| `chatInitActor` | `chat-machine.actors.ts` | **被** `loadQuotaActor` + `loadHistoryActor` **替**换** |
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| `readInitData` | `chat-machine.helpers.ts` | **被** 2 **个**新 helper **替**换** |
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### 修改
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| 函数 | 位置 | 改**动** |
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|---|---|---|
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| `chatInitActor` actor **注**册 | `chat-machine.ts` actors | 改**为** `loadQuota` + `loadHistory` |
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| `guestSession.initializing` | `chat-machine.ts` | 用 `invoke: [loadQuota, loadHistory]` 并行；`always` + guard **进** `ready` |
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| `userSession.initializing` | `chat-machine.ts` | invoke `loadHistory`（**保**留 parent `chatWebSocket`）；`always` + guard **进** `ready` |
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| `guestSession.loadingMore` | `chat-machine.ts` | **删** |
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| `guestSession.ready.on.ChatLoadMoreHistory` | `chat-machine.ts` | **删** |
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## [Classes]
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**无** class 变更（store 全部**走** setup + createMachine 函**数**式 API）。
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## [Dependencies]
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**无**新增依赖。
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## [State Machine 设计]
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### guestSession.initializing（游客 init：2 **并**行任务）
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```typescript
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guestSession: {
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initial: "initializing",
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states: {
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initializing: {
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// "always" barrier —— 两**个**任务**都**完**成**才**进** ready
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always: [
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{
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target: "ready",
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guard: ({ context }) => context.quotaLoaded && context.historyLoaded,
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},
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],
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invoke: [
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// 任务 1：加载配额（fromPromise，**返**结果 + onDone 设 flag）
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{
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id: "loadQuota",
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src: "loadQuota",
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onDone: {
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actions: assign(({ event }) => ({
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guestRemainingQuota: event.output.remaining,
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guestTotalQuota: event.output.total,
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quotaLoaded: true,
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})),
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},
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onError: {
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// 失败**也**标 loaded，**不**卡 init（**游**客**可**能 quota 服务**不**可**用**，**让** UI **进** ready）
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actions: assign({ quotaLoaded: true }),
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},
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},
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// 任务 2：拉 history（fromCallback，3 **步** sendBack）
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{
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id: "loadHistory",
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src: "loadHistory",
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},
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],
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},
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ready: {
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on: {
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ChatSendMessage: { /* ... 不变 ... */ },
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ChatSendImage: { /* ... 不变 ... */ },
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// 删**除** ChatLoadMoreHistory handler（游**客****无**翻**页**）
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ChatLogout: "#chat.idle",
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ChatNonGuestLogin: "#chat.userSession",
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// 新**增**：处理 history actor 派**回**的 3 **个**事件
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ChatHistoryLocalLoaded: { actions: assign({ messages: ({ event }) => event.messages }) },
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ChatHistoryNetworkLoaded: {
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actions: assign(({ event }) => ({
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messages: event.messages,
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hasMore: event.hasMore,
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historyOffset: event.newOffset,
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historyLoaded: true,
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})),
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},
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ChatHistorySyncDone: { /* no-op，**只**用**于**日**志** */ },
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ChatQuotaLoaded: { actions: assign(({ event }) => ({
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guestRemainingQuota: event.remaining,
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guestTotalQuota: event.total,
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quotaLoaded: true,
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})) },
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// 既有
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ChatAISentenceReceived: { actions: "appendOrUpdateAISentence" },
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ChatWebSocketError: { actions: "appendSocketErrorMessage" },
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ChatWebSocketConnected: { actions: "setWsConnected" },
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ChatQuotaExceeded: { actions: "incrementQuotaExceeded" },
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},
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},
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// 删**除** sending、loadingMore **里**和 ChatLoadMoreHistory **有**关**的**部**分**
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sending: { /* ... 保持 ... */ },
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},
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},
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```
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**注**：游客 init 中 `loadHistory` 的 3 步事件（`ChatHistoryLocalLoaded` / `ChatHistoryNetworkLoaded` / `ChatHistorySyncDone`）由 `fromCallback` 内部**派**到 machine，而 machine **只**在 `ready` 状态**才**能收到事件（initializing **处**于**入**口，**收**到**的**事件**会**被 XState 排**队**？**或**丢**失**）。**解**决**方**案**：
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- **方**案 A：`loadHistory` actor **不**用 fromCallback，**改**用 fromPromise，**内**部 sendBack 改**为** await **返**回**单**个**值**，**值**里**包**含 local + network + hasMore + newOffset
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- **方**案 B：把 `loadHistory` actor **移**到 `ready` 状态 invoke，**在** initializing 阶**段**只 invoke `loadQuota`；ready **触**发**后**再 invoke `loadHistory`
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- **方**案 C：**用** XState v5 **的** `defer` API，initializing 阶**段** 收到**的**事件**延**后**到 ready 处理
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**采**用**方**案 A**（**最**简**）—— fromPromise + 单**一**返**回**值**。**这**意**味**着** UI **会**一次**性**看**到** network **结**果**（**不**会**分**两**步**看**到** local → network），**但** local → network → save **的**内部**顺**序**仍**然**走**。**如**果**用**户**强**调** UI **必**须**分**两**步**看**到**，**改**用**方**案 B（ready **后**再**触**发** history actor）。
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### userSession.initializing（非游客 init：WS 父级 + history 子级）
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```typescript
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userSession: {
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initial: "initializing",
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exit: "clearWsConnected",
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invoke: { // 父级：WS 长**连**接
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src: "chatWebSocket",
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input: ({ event }) => ({
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token: event.type === "ChatNonGuestLogin" ? event.token : "",
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}),
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},
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states: {
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initializing: {
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// barrier：WS **连**上** + history **加**载**完**成**
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always: [
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{
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target: "ready",
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guard: ({ context }) => context.wsConnected && context.historyLoaded,
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},
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],
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invoke: {
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// 任务 2：拉 history
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src: "loadHistory",
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},
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},
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ready: {
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on: {
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ChatSendMessage: { /* ... */ },
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ChatSendImage: { /* ... */ },
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ChatLoadMoreHistory: { /* 翻**页**（**保**留**） */ },
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ChatLogout: "#chat.idle",
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ChatGuestLogin: "#chat.guestSession",
|
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// 新**增**：处理 history actor 派**回**的 3 **个**事件（同 guestSession）
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ChatHistoryLocalLoaded: { actions: assign({ messages: ({ event }) => event.messages }) },
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ChatHistoryNetworkLoaded: { actions: assign({ /* messages + hasMore + historyOffset + historyLoaded */ }) },
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ChatHistorySyncDone: { /* no-op */ },
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// 既有
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ChatAISentenceReceived: { actions: "appendOrUpdateAISentence" },
|
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ChatWebSocketError: { actions: "appendSocketErrorMessage" },
|
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ChatWebSocketConnected: { actions: "setWsConnected" },
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ChatQuotaExceeded: { actions: "incrementQuotaExceeded" },
|
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},
|
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},
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sending: { /* ... 保持 ... */ },
|
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loadingMore: { /* ... 保持（**保**留** loadMoreHistory） ... */ },
|
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},
|
||||
},
|
||||
```
|
||||
|
||||
## [Actors 设计]
|
||||
|
||||
### `loadQuotaActor`（fromPromise）
|
||||
|
||||
```typescript
|
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// chat-machine.actors.ts
|
||||
export const loadQuotaActor = fromPromise<{ remaining: number; total: number }>(
|
||||
async () => readGuestQuota(),
|
||||
);
|
||||
```
|
||||
|
||||
### `loadHistoryActor`（fromPromise，**单**一**返**回**值**）
|
||||
|
||||
```typescript
|
||||
// chat-machine.actors.ts
|
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/**
|
||||
* 拉 history：**内**部**走** local → network → save network to local
|
||||
* **返**回**最**终**的 network messages + local 被覆盖**后**的**状**态**
|
||||
*
|
||||
* **如**要 UI **两**步**看**到** local → network：**改**用** fromCallback + sendBack
|
||||
* （**本**轮**先**用** fromPromise **简**化**）
|
||||
*/
|
||||
export const loadHistoryActor = fromPromise<{
|
||||
messages: UiMessage[]; // network **返**回**的**最**终** messages
|
||||
hasMore: boolean;
|
||||
newOffset: number;
|
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localOverwritten: boolean; // true = local **已**被 network **覆**盖
|
||||
}>(async () => {
|
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// 1. **读** local
|
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const localResult = await chatRepo.getLocalMessages();
|
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const localMessages = (Result.isOk(localResult) && localResult.data)
|
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? localMessagesToUi(localResult.data)
|
||||
: [];
|
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console.log("[chat-machine] loadHistoryActor LOCAL DONE", { count: localMessages.length });
|
||||
|
||||
// 2. **读** network
|
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const networkResult = await chatRepo.getHistory(PAGE_SIZE, 0);
|
||||
if (!Result.isOk(networkResult)) {
|
||||
console.error("[chat-machine] loadHistoryActor NETWORK FAILED", { error: networkResult.success ? null : (networkResult as any).error });
|
||||
// **返**空 messages（**不**崩）
|
||||
return { messages: localMessages, hasMore: false, newOffset: 0, localOverwritten: false };
|
||||
}
|
||||
const networkUi = localMessagesToUi(networkResult.data.messages);
|
||||
console.log("[chat-machine] loadHistoryActor NETWORK DONE", { count: networkUi.length });
|
||||
|
||||
// 3. **用** network 覆**盖** local（"**再**用**网**络**数**据**覆**盖**本**地**数**据"）
|
||||
const saveResult = await chatRepo.saveMessagesToLocal(networkResult.data.messages);
|
||||
const localOverwritten = Result.isOk(saveResult);
|
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console.log("[chat-machine] loadHistoryActor SAVE TO LOCAL DONE", { localOverwritten });
|
||||
|
||||
// 4. **返** network 结果（**不**返** local —— network **是** authorititative）
|
||||
return {
|
||||
messages: networkUi,
|
||||
hasMore: networkUi.length >= PAGE_SIZE,
|
||||
newOffset: networkUi.length,
|
||||
localOverwritten,
|
||||
};
|
||||
});
|
||||
```
|
||||
|
||||
## [Helpers 设计]
|
||||
|
||||
### `readGuestQuota`
|
||||
|
||||
```typescript
|
||||
// chat-machine.helpers.ts
|
||||
export async function readGuestQuota(): Promise<{ remaining: number; total: number }> {
|
||||
const chatStorage = ChatStorage.getInstance();
|
||||
const [dailyResult, totalResult] = await Promise.all([
|
||||
chatStorage.getGuestDailyChatQuota(),
|
||||
chatStorage.getGuestTotalQuota(),
|
||||
]);
|
||||
return {
|
||||
remaining: mapQuotaResult(dailyResult as Result<{ remaining: number } | null>, 0),
|
||||
total: mapTotalQuotaResult(totalResult as Result<number | null>, 0),
|
||||
};
|
||||
}
|
||||
```
|
||||
|
||||
### `readAndSyncHistory`（**可**选，**如** actors **内**联**也** OK）
|
||||
|
||||
```typescript
|
||||
// chat-machine.helpers.ts
|
||||
/**
|
||||
* 拉 history 3 步流（**纯** async，**无** sendBack）：
|
||||
* 1. **读** local
|
||||
* 2. **读** network
|
||||
* 3. **用** network 覆**盖** local
|
||||
*
|
||||
* **返**回**最**终** network messages（**给** UI **用**），**不**返**回** local messages
|
||||
* （**因**为 network **是** authorititative）
|
||||
*/
|
||||
export async function readAndSyncHistory(): Promise<{
|
||||
messages: UiMessage[];
|
||||
hasMore: boolean;
|
||||
newOffset: number;
|
||||
localOverwritten: boolean;
|
||||
}> {
|
||||
// ... 3 步实**现** ...
|
||||
}
|
||||
```
|
||||
|
||||
## [History 事件的**消**费**位**置]
|
||||
|
||||
**两**种**选**择**（**前**面**提**到**的**方**案 A vs B）：
|
||||
|
||||
| **方**案 | UI **分**两**步**看**到** local → network | **代**码**复**杂**度** | **推**荐** |
|
||||
|---|---|---|---|
|
||||
| **A. fromPromise** | **否**（**直**接**看**到** network） | 低 | **本**轮**首**选**（**满**足**用**户**"内**部**走** local → network → save"**的**核**心**要**求**）|
|
||||
| **B. fromCallback** | **是** | 高 | **后**续**可**选** |
|
||||
|
||||
**采**用**方**案 A**。**用**户**说**的**"展示**到**界**面**上"**可**以**理**解**为**"**最**终**展**示**"**（**即** network **的**结**果**），**不**一**定**要**求** UI **有**中间态**（local）。**如**果**后**续** UI **测**试**反**馈**需**要**中**间**态**，**升**级**到**方**案 B**。
|
||||
|
||||
## [Helpers 删除]
|
||||
|
||||
`readInitData` **被** `readGuestQuota` + `readAndSyncHistory` **替**换**。**新**增**到** `chat-machine.helpers.ts`，**旧**的** `readInitData` **以**及**其**导**入**（`AuthStorage`, `LocalChatStorage`, `chatRepo.getLocalMessages`）**都**可**移**除**（**改**在** `readAndSyncHistory` **里**面**按**需**导入**）。
|
||||
|
||||
## [Testing]
|
||||
|
||||
### 验**证**策略
|
||||
|
||||
- `npx tsc --noEmit`：0 **错**误**
|
||||
- `pnpm lint`：**通**过**
|
||||
- **手**动 smoke：
|
||||
- **游**客**进** /chat：看到 messages（**先** local **如**果**有**缓存**，**后**被 network **覆**盖**）
|
||||
- **非**游客**进** /chat：WS **连**接** + messages **显**示
|
||||
- 退**出** → 重**进** → local **有**缓存**（**上**次** network **已**存**入**）
|
||||
- **日**志**检**查**：loadHistoryActor **的** `[chat-machine] loadHistoryActor LOCAL/NETWORK/SAVE TO LOCAL DONE` **三**条**日**志**顺**序**出**现**
|
||||
|
||||
### 测**试**要**点**
|
||||
|
||||
1. **独**立**性**：loadQuota **失**败**不**影**响** loadHistory，**反**之**亦**然**
|
||||
2. **always barrier**：两**个** flag **都** true **才**进** ready**
|
||||
3. **local overwrite**：loadHistory onDone **后** ChatStorage **里**是** network **的**数**据**
|
||||
4. **WS + history 并**行**（userSession）：WS **连**接** + history **同**时**跑**，**都**完**了**才** ready**
|
||||
|
||||
## [Trade-offs]
|
||||
|
||||
- ✅ **每**个**任务**独**立** actor（**满**足**用**户**"**独**立**函**数"**要**求**）
|
||||
- ✅ local → network → save **内**部**走**（**满**足**用**户** history **逻**辑**要**求**）
|
||||
- ✅ 并**行**（**不**是**串**行**）—— UX **更**快**
|
||||
- ✅ **兼**容**旧**接口**（ChatLoadMoreHistory 翻**页** 仍**然**走 loadMoreHistoryActor，**不**变**）
|
||||
- ⚠️ **方**案 A：UI **不**会**看**到** local 中**间**态**（**只**看**到** network **最**终**）—— **如**果** UI **测**试**反**馈**需**要**中**间**态**，**改**为** fromCallback
|
||||
- ⚠️ `guestSession.loadingMore` **被**删**（**游**客**无**翻**页**）—— **如**果**以**后**要** local 翻**页**（**本**地**缓**存**很**多**），**重**新**加**回
|
||||
|
||||
## [Implementation Order]
|
||||
|
||||
1. **chat-events.ts**：加 4 个新事件，删 `ChatInit`
|
||||
2. **chat-state.ts**：加 `quotaLoaded` + `historyLoaded` 字段（default false）
|
||||
3. **chat-machine.helpers.ts**：删 `readInitData`；加 `readGuestQuota` + `readAndSyncHistory`
|
||||
4. **chat-machine.actors.ts**：删 `chatInitActor`；加 `loadQuotaActor` + `loadHistoryActor`（fromPromise 方案 A）
|
||||
5. **chat-machine.ts**：注册新 actors；加 actions `setQuotaLoaded` / `setHistoryLoaded`；重构 `guestSession.initializing` + `userSession.initializing`（`always` + guard）；处理新事件；删 `guestSession.loadingMore`
|
||||
6. **chat-context.tsx**：暴露新字段（如果 UI 需要）
|
||||
7. **验证**：`pnpm tsc --noEmit` + `pnpm lint` + dev server smoke
|
||||
|
||||
Reference in New Issue
Block a user