104 lines
3.3 KiB
Markdown
104 lines
3.3 KiB
Markdown
To solve the **desynchronization problem** where **Client 2 sees default state instead of current state**, the AI agent needs to implement **state synchronization on join**. Here's a detailed plan for what needs to be done, which you can feed to an AI agent or developer:
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---
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## ✅ Problem Summary
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* **Client 1** changes app state; changes are broadcast via WebSocket.
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* **Client 2** joins a session but does **not receive the current state** of all elements—only the default.
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* When Client 1 makes further changes, Client 2 sees them, but this causes layout inconsistency since Client 2’s other state is outdated.
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* If Client 2 makes changes, it **overwrites** the correct session state.
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---
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## 🧠 What the AI Agent Must Do
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### 1. **Server: Maintain the Current State per Session**
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* In `server.js`, ensure there is a per-session object (e.g., `{ sessionId: stateObject }`) that stores **all element states**.
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* When **Client 1** sends a change message (`{ type: 'update', payload: {...} }`), update that stored session state accordingly.
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#### ✅ Example in `server.js`
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```js
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const sessions = {}; // { [sessionId]: { state: {...}, clients: [] } }
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function handleMessage(message, ws, sessionId) {
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const data = JSON.parse(message);
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if (data.type === 'update') {
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// Update session state
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if (!sessions[sessionId].state) sessions[sessionId].state = {};
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sessions[sessionId].state[data.payload.id] = data.payload;
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// Broadcast to others
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broadcastExcept(ws, sessionId, message);
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}
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}
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```
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---
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### 2. **Client 2: Request the Current Session State on Join**
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* When Client 2 connects via WebSocket, it must send a message like:
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```json
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{ "type": "get_state" }
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```
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---
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### 3. **Server: Respond to `get_state` with Full State Snapshot**
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* On receiving `{ type: 'get_state' }`, send:
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```json
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{ "type": "session_state", "payload": { ...allCurrentState } }
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```
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---
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### 4. **Client 2: Apply the Session State on First Load**
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In `useDrumMachine` (or wherever state is applied), handle a new message type:
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```ts
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if (message.type === 'session_state') {
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applyFullState(message.payload); // update all controls
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}
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```
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---
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### 5. **(Optional) Mark Synchronization Complete**
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* Use a flag like `isSynchronized` on the client to **ignore all inputs** until the full session state is received and applied.
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---
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## 🧩 Where This Fits in Your Code
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* In `App.tsx`, you’re already using a `useWebSocket` hook — you’ll need to modify it so that:
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* On `open`, send `get_state`.
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* On receiving `session_state`, trigger state application.
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* The actual application of state will happen inside `useDrumMachine`.
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---
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## ✅ Summary Checklist
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| Step | Task |
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| ---- | --------------------------------------------------------- |
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| ✅ | Store session state on server per `sessionId` |
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| ✅ | Update session state on every change |
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| ✅ | On new client connect, send `get_state` |
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| ✅ | Server responds with `session_state` |
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| ✅ | Client applies full session state before handling updates |
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| ⛔ | Don't allow local edits before sync is complete |
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---
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Would you like help modifying the specific `useWebSocket` or `useDrumMachine` code to support this logic?
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