docs(phase-3): research hook server domain
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.planning/phases/03-hook-server/03-RESEARCH.md
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.planning/phases/03-hook-server/03-RESEARCH.md
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# Phase 3: Hook Server - Research
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**Researched:** 2026-03-23
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**Domain:** Claude Code hooks HTTP, Go net/http server, state detection push
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**Confidence:** HIGH
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## Summary
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Claude Code supporte nativement les hooks HTTP (type `"http"`) dans `settings.json`. vmuxd doit exposer un serveur HTTP local qui recoit les events POST de Claude Code. Chaque event contient `session_id`, `cwd`, `transcript_path`, et `hook_event_name`. Les events pertinents pour vmux sont : **Notification** (avec `notification_type` : `permission_prompt`, `idle_prompt`), **Stop** (session terminee), **PostToolUse** (session active), et **PreToolUse** (session active).
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Le format est simple : Claude Code POST du JSON sur l'URL configuree, attend une reponse 2xx. Le serveur vmuxd parse le payload, met a jour le registre, et repond 200 OK. Pas besoin de lib externe, `net/http` stdlib suffit.
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**Primary recommendation:** Ajouter un `http.Server` dans le Daemon qui ecoute sur `localhost:3119`, configurer les hooks HTTP dans `~/.claude/settings.json`, et mapper les events vers des mises a jour imm du registre avec le nouveau champ `WaitType`.
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<user_constraints>
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## User Constraints (from CONTEXT.md)
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### Locked Decisions
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- **D-01:** Hooks comme source primaire. Le poll reste actif mais ralenti (15-30s) comme filet de securite pour les sessions sans hooks configures ou en cas d'event rate.
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- **D-02:** Quand un hook event arrive, le registre est mis a jour immediatement (pas besoin d'attendre le prochain cycle de poll).
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### Claude's Discretion
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- Port HTTP pour le hook server (ex: localhost:3119 ou port dynamique)
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- Format exact des requetes hook Claude Code (consulter la doc officielle)
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- Mapping events hook vers types d'attente (permission_prompt, idle_prompt, etc.)
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- Comment les hooks Claude Code sont configures (fichier .claude/settings.json ou equivalent)
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- Intervalle du poll fallback ralenti (entre 15s et 30s)
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### Deferred Ideas (OUT OF SCOPE)
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None
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</user_constraints>
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<phase_requirements>
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## Phase Requirements
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| ID | Description | Research Support |
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|----|-------------|------------------|
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| STATE-03 | vmux distingue le type d'attente (permission prompt, question utilisateur, idle prompt) | Les hooks Notification fournissent `notification_type` avec valeurs `permission_prompt` et `idle_prompt`. Le hook Stop + `last_assistant_message` permet de detecter `end_turn` (question utilisateur). PostToolUse confirme "Working". |
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</phase_requirements>
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## Standard Stack
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### Core
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| Library | Version | Purpose | Why Standard |
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|---------|---------|---------|--------------|
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| net/http (stdlib) | Go 1.25 | HTTP server | Suffisant pour un serveur local simple. Pas besoin de framework. |
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| encoding/json (stdlib) | Go 1.25 | JSON parsing | Deja utilise partout dans le projet. |
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### Supporting
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| Library | Version | Purpose | When to Use |
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|---------|---------|---------|-------------|
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| net/http/httptest (stdlib) | Go 1.25 | Test HTTP handlers | Pour les tests unitaires du hook server sans ouvrir de port. |
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### Alternatives Considered
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| Recommended | Alternative | When to Use Alternative |
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|-------------|-------------|-------------------------|
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| net/http stdlib | chi / gin / echo | Jamais pour ce cas. Un seul endpoint POST, zero besoin de routing avance. |
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| Port fixe 3119 | Port dynamique (port 0) | Si conflit de port. Mais le port dynamique compliquerait la configuration hooks dans settings.json (il faudrait un script qui decouvre le port). |
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## Architecture Patterns
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### Hook Server Integration dans le Daemon
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Le hook server est une goroutine supplementaire dans le Daemon existant, comme pollLoop et acceptLoop.
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```
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Daemon
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|-- acceptLoop() (Unix socket, deja existant)
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|-- pollLoop() (scan /proc, deja existant, sera ralenti)
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|-- hookServerLoop() (NEW: HTTP server localhost:3119)
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```
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### Payload Claude Code (verifie avec la doc officielle)
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Tous les events recoivent ces champs communs :
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```json
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{
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"session_id": "abc123",
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"transcript_path": "/home/pierre/.claude/projects/.../uuid.jsonl",
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"cwd": "/home/pierre/Code/vibe/vmux",
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"hook_event_name": "Notification"
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}
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```
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**Notification** ajoute :
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```json
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{
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"notification_type": "permission_prompt",
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"message": "Claude needs your permission to use Bash",
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"title": "Permission needed"
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}
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```
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**Stop** ajoute :
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```json
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{
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"stop_hook_active": true,
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"last_assistant_message": "I've completed..."
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}
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```
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**PostToolUse** ajoute :
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```json
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{
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"tool_name": "Bash",
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"tool_input": { "command": "..." }
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}
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```
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### Mapping Events vers WaitType
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| Hook Event | notification_type | WaitType dans vmux | SessionState |
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|------------|------------------|-------------------|--------------|
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| Notification | `permission_prompt` | `"permission"` | NeedsInput |
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| Notification | `idle_prompt` | `"idle"` | NeedsInput |
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| Stop | - | `"question"` | NeedsInput |
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| PostToolUse | - | `""` (clear) | Working |
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| PreToolUse | - | `""` (clear) | Working |
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Le champ `WaitType` est ajoute a `SessionInfo` :
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```go
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type SessionInfo struct {
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// ... champs existants ...
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WaitType string `json:"wait_type,omitempty"` // "permission", "question", "idle", ""
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}
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```
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### Configuration hooks dans settings.json
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Ajouter dans `~/.claude/settings.json` :
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```json
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{
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"hooks": {
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"Notification": [
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{
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"matcher": "permission_prompt|idle_prompt",
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"hooks": [
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{
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"type": "http",
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"url": "http://localhost:3119/hook",
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"timeout": 5
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}
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]
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}
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],
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"Stop": [
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{
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"hooks": [
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{
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"type": "http",
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"url": "http://localhost:3119/hook",
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"timeout": 5
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}
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]
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}
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],
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"PostToolUse": [
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{
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"hooks": [
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{
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"type": "http",
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"url": "http://localhost:3119/hook",
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"timeout": 5
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}
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]
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}
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]
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}
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}
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```
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Un seul endpoint `/hook` suffit. Le `hook_event_name` dans le payload permet de router.
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### Cohabitation Poll / Hooks (D-01)
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```go
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// Quand un hook event arrive, reset le timer de poll pour eviter le double scan
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type Daemon struct {
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// ... existant ...
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hookPort int
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httpServer *http.Server
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pollInterval time.Duration // passe de 5s a 20s quand hooks actifs
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lastHookTime time.Time // pour savoir si les hooks fonctionnent
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}
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```
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Strategie : si `lastHookTime` < 60s, le poll est en mode fallback (20s). Sinon, revenir au poll rapide (5s) pour couvrir les sessions sans hooks.
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### Pattern du Handler HTTP
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```go
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func (d *Daemon) handleHook(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodPost {
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http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
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return
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}
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var event HookEvent
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if err := json.NewDecoder(r.Body).Decode(&event); err != nil {
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http.Error(w, "bad request", http.StatusBadRequest)
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return
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}
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d.processHookEvent(event)
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w.WriteHeader(http.StatusOK)
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}
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```
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### Anti-Patterns to Avoid
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- **Over-engineering le routing**: Un seul endpoint `/hook` avec dispatch sur `hook_event_name`. Pas de router, pas de middleware.
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- **Bloquer sur le hook**: Le handler doit repondre vite (< 100ms). La mise a jour du registre est un lock rapide, pas de I/O.
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- **Ignorer le timeout**: Claude Code attend max 30s (defaut HTTP hooks). Repondre en < 100ms elimine ce risque.
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## Don't Hand-Roll
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| Problem | Don't Build | Use Instead | Why |
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|---------|-------------|-------------|-----|
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| HTTP server | Framework (chi, gin) | net/http stdlib | Un seul endpoint, zero routing complexe |
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| JSON parsing du payload | Struct generique + reflection | Structs Go typees par event | Plus simple, plus rapide, testable |
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| Settings.json generation | Script qui modifie settings.json | Documentation manuelle + `vmux setup` futur | Modifier settings.json d'un utilisateur est dangereux |
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## Common Pitfalls
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### Pitfall 1: Port deja occupe
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**What goes wrong:** Le daemon ne demarre pas si le port 3119 est deja pris.
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**Why it happens:** Autre instance de vmuxd, ou autre service local.
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**How to avoid:** Essayer de bind, si erreur logger un warning et continuer sans hooks (fallback poll uniquement). Ne pas crasher le daemon.
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**Warning signs:** `listen tcp 127.0.0.1:3119: bind: address already in use`
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### Pitfall 2: Session ID mismatch entre hooks et poll
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**What goes wrong:** Le hook envoie un `session_id` que le registre ne connait pas encore (session pas encore scannee par le poll).
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**Why it happens:** Le hook arrive avant le premier scan du poll pour cette session.
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**How to avoid:** Le hook handler doit creer une entree dans le registre meme si la session n'existe pas encore. Le poll la completera au prochain cycle.
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**Warning signs:** Hook events ignores silencieusement.
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### Pitfall 3: Hooks pas configures
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**What goes wrong:** Le serveur HTTP tourne mais ne recoit aucun event.
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**Why it happens:** L'utilisateur n'a pas ajoute les hooks dans `~/.claude/settings.json`.
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**How to avoid:** Commande `vmux setup` ou documentation claire. Logger un warning si aucun hook recu apres 60s de fonctionnement avec des sessions actives.
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**Warning signs:** `vmux list` montre des etats avec le delai du poll (5-20s) au lieu du temps reel.
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### Pitfall 4: Hook settings.json ecrase les hooks existants
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**What goes wrong:** L'utilisateur a deja des hooks PostToolUse (comme rtk-rewrite.sh, piaire-post.sh). Ajouter vmux ne doit pas les supprimer.
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**Why it happens:** Chaque event dans settings.json est un tableau. vmux ajoute un element, pas un remplacement.
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**How to avoid:** La config vmux s'ajoute au tableau existant. Le matcher `"*"` ou absent capte tous les events.
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**Warning signs:** Les hooks existants (RTK, piaire) cessent de fonctionner.
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### Pitfall 5: Body trop grand / request malformee
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**What goes wrong:** Le handler panic ou bloque sur un body de taille illimitee.
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**Why it happens:** Pas de limit reader sur le body.
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**How to avoid:** `http.MaxBytesReader(w, r.Body, 64*1024)` (64KB largement suffisant).
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**Warning signs:** Memory spike sur le daemon.
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## Code Examples
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### HookEvent struct
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```go
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// HookEvent represents the JSON payload sent by Claude Code hooks.
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type HookEvent struct {
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SessionID string `json:"session_id"`
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TranscriptPath string `json:"transcript_path"`
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Cwd string `json:"cwd"`
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HookEventName string `json:"hook_event_name"`
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// Notification-specific
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NotificationType string `json:"notification_type,omitempty"`
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Message string `json:"message,omitempty"`
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Title string `json:"title,omitempty"`
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// Stop-specific
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LastAssistantMsg string `json:"last_assistant_message,omitempty"`
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StopHookActive bool `json:"stop_hook_active,omitempty"`
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// PostToolUse-specific
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ToolName string `json:"tool_name,omitempty"`
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}
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```
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### processHookEvent
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```go
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func (d *Daemon) processHookEvent(event HookEvent) {
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if event.SessionID == "" {
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return
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}
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var state string
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var waitType string
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switch event.HookEventName {
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case "Notification":
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state = "Needs Input"
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switch event.NotificationType {
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case "permission_prompt":
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waitType = "permission"
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case "idle_prompt":
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waitType = "idle"
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default:
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waitType = "question"
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}
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case "Stop":
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state = "Needs Input"
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waitType = "question"
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case "PostToolUse", "PreToolUse":
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state = "Working"
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waitType = ""
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default:
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return
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}
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d.registry.UpdateFromHook(event.SessionID, state, waitType, event.Cwd)
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d.lastHookTime = time.Now()
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}
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```
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### Registry.UpdateFromHook
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```go
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// UpdateFromHook updates a session from a hook event.
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// Creates the entry if it doesn't exist yet (hook can arrive before first poll).
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func (r *SessionRegistry) UpdateFromHook(sessionID, state, waitType, cwd string) {
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r.mu.Lock()
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defer r.mu.Unlock()
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existing, ok := r.sessions[sessionID]
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if !ok {
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existing = &TrackedSession{}
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r.sessions[sessionID] = existing
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}
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prevState := existing.PrevState
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existing.Info.SessionID = sessionID
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existing.Info.State = state
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existing.Info.WaitType = waitType
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if cwd != "" {
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existing.Info.Cwd = cwd
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}
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// WaitingSince transition
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isWaiting := state == "Needs Input"
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wasWaiting := prevState == "Needs Input"
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if isWaiting && !wasWaiting {
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now := time.Now()
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existing.Info.WaitingSince = &now
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} else if !isWaiting {
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existing.Info.WaitingSince = nil
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}
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existing.PrevState = state
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}
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```
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### HTTP Server startup dans Daemon
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```go
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func (d *Daemon) startHookServer() error {
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mux := http.NewServeMux()
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mux.HandleFunc("/hook", d.handleHook)
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d.httpServer = &http.Server{
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Addr: fmt.Sprintf("127.0.0.1:%d", d.hookPort),
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Handler: mux,
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ReadTimeout: 5 * time.Second,
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WriteTimeout: 5 * time.Second,
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}
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ln, err := net.Listen("tcp", d.httpServer.Addr)
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if err != nil {
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log.Printf("Warning: hook server unavailable on port %d: %v (poll-only mode)", d.hookPort, err)
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return nil // graceful degradation
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}
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|
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go d.httpServer.Serve(ln)
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log.Printf("Hook server listening on %s", d.httpServer.Addr)
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return nil
|
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}
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```
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|
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### Test pattern avec httptest
|
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|
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```go
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func TestHandleHookNotification(t *testing.T) {
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d := newTestDaemon(t)
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d.hookPort = 0 // not used in direct handler test
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body := `{
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"session_id": "sess-1",
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"hook_event_name": "Notification",
|
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"notification_type": "permission_prompt",
|
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"cwd": "/home/user/project"
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}`
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req := httptest.NewRequest(http.MethodPost, "/hook", strings.NewReader(body))
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w := httptest.NewRecorder()
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|
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d.handleHook(w, req)
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|
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if w.Code != http.StatusOK {
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t.Fatalf("status = %d, want 200", w.Code)
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}
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list := d.registry.List()
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if len(list) != 1 {
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t.Fatalf("registry len = %d, want 1", len(list))
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}
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if list[0].WaitType != "permission" {
|
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t.Errorf("WaitType = %q, want %q", list[0].WaitType, "permission")
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}
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if list[0].State != "Needs Input" {
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t.Errorf("State = %q, want %q", list[0].State, "Needs Input")
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}
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}
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```
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## Validation Architecture
|
||||
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||||
### Test Framework
|
||||
| Property | Value |
|
||||
|----------|-------|
|
||||
| Framework | Go testing (stdlib) |
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||||
| Config file | Makefile (target `test`) |
|
||||
| Quick run command | `nix-shell --run "go test -v -run TestHook ./..."` |
|
||||
| Full suite command | `nix-shell --run "go test -v -race ./..."` |
|
||||
|
||||
### Phase Requirements to Test Map
|
||||
| Req ID | Behavior | Test Type | Automated Command | File Exists? |
|
||||
|--------|----------|-----------|-------------------|-------------|
|
||||
| STATE-03a | Hook event Notification/permission_prompt met a jour WaitType="permission" | unit | `nix-shell --run "go test -v -run TestHandleHookNotification ./..."` | Wave 0 |
|
||||
| STATE-03b | Hook event Notification/idle_prompt met a jour WaitType="idle" | unit | `nix-shell --run "go test -v -run TestHandleHookIdle ./..."` | Wave 0 |
|
||||
| STATE-03c | Hook event Stop met a jour WaitType="question" | unit | `nix-shell --run "go test -v -run TestHandleHookStop ./..."` | Wave 0 |
|
||||
| STATE-03d | Hook event PostToolUse met a jour State="Working" et clear WaitType | unit | `nix-shell --run "go test -v -run TestHandleHookPostToolUse ./..."` | Wave 0 |
|
||||
| STATE-03e | WaitType visible dans `vmux list` (SessionInfo JSON) | unit | `nix-shell --run "go test -v -run TestSessionInfoWaitType ./..."` | Wave 0 |
|
||||
| STATE-03f | Poll ralenti a 20s quand hooks actifs | unit | `nix-shell --run "go test -v -run TestPollSlowdown ./..."` | Wave 0 |
|
||||
| STATE-03g | Graceful degradation si port occupe | unit | `nix-shell --run "go test -v -run TestHookServerPortBusy ./..."` | Wave 0 |
|
||||
|
||||
### Sampling Rate
|
||||
- **Per task commit:** `nix-shell --run "go test -v -run TestHook ./..."`
|
||||
- **Per wave merge:** `nix-shell --run "go test -v -race ./..."`
|
||||
- **Phase gate:** Full suite green before `/gsd:verify-work`
|
||||
|
||||
### Wave 0 Gaps
|
||||
- [ ] `hook_test.go` -- tests du hook HTTP handler (STATE-03a/b/c/d)
|
||||
- [ ] `protocol_test.go` -- test du champ WaitType dans SessionInfo (STATE-03e)
|
||||
- [ ] `daemon_test.go` -- test poll slowdown et graceful degradation (STATE-03f/g)
|
||||
|
||||
## State of the Art
|
||||
|
||||
| Old Approach | Current Approach | When Changed | Impact |
|
||||
|--------------|------------------|--------------|--------|
|
||||
| Hooks command-only | Hooks HTTP natif | Claude Code 2025-Q4 | Plus besoin de scripts shell intermediaires |
|
||||
| 12 hook events | 22 hook events (mars 2026) | Mars 2026 | SessionEnd, PreCompact, PostCompact, ConfigChange, etc. |
|
||||
| Pas de notification_type | Matcher par notification_type | 2026 | Permet de filtrer permission_prompt vs idle_prompt |
|
||||
|
||||
## Open Questions
|
||||
|
||||
1. **Faut-il un `vmux setup` qui modifie settings.json automatiquement ?**
|
||||
- Ce qu'on sait : settings.json est un fichier partage avec les hooks existants (RTK, piaire, GSD). Le modifier programmatiquement risque d'ecraser des configurations.
|
||||
- Recommandation : Phase 3 fournit la documentation de la configuration. Un `vmux setup` automatique peut etre ajoute plus tard (pas dans le scope STATE-03).
|
||||
|
||||
2. **Le `idle_prompt` se declenche quand exactement ?**
|
||||
- Ce qu'on sait : quand Claude Code affiche le prompt apres avoir fini de repondre (l'utilisateur n'a pas encore tape de message). C'est equivalent au `end_turn` + idle.
|
||||
- Ce qui n'est pas clair : la difference exacte entre `idle_prompt` et `Stop`. En pratique, `Stop` fire quand Claude finit de repondre, `idle_prompt` fire quand le prompt attend depuis un moment.
|
||||
- Recommandation : traiter les deux. `Stop` = `"question"`, `idle_prompt` = `"idle"`.
|
||||
|
||||
## Environment Availability
|
||||
|
||||
| Dependency | Required By | Available | Version | Fallback |
|
||||
|------------|------------|-----------|---------|----------|
|
||||
| Go | Build | Oui (nix-shell) | 1.25.7 | -- |
|
||||
| net/http (stdlib) | Hook server | Oui | Go 1.25 | -- |
|
||||
| Claude Code hooks HTTP | Push events | Oui (settings.json) | 22 events (mars 2026) | Poll-only (5s) |
|
||||
| Port 3119 TCP | Hook server | A verifier au runtime | -- | Log warning, poll-only |
|
||||
|
||||
## Sources
|
||||
|
||||
### Primary (HIGH confidence)
|
||||
- [Claude Code Hooks Reference](https://code.claude.com/docs/en/hooks) - Documentation officielle complete des 22 events, format payload HTTP, configuration settings.json
|
||||
- `~/.claude/settings.json` sur la machine locale - Verification directe du format existant des hooks command
|
||||
- Code existant vmux (daemon.go, state.go, protocol.go) - Architecture actuelle du daemon
|
||||
|
||||
### Secondary (MEDIUM confidence)
|
||||
- [Algo Insights - Claude Code HTTP Hooks](https://algoinsights.medium.com/claude-code-just-got-http-hooks-heres-why-that-changes-everything-6938ffaae1f6) - Confirmation des HTTP hooks
|
||||
- Hooks existants (rtk-rewrite.sh, piaire-post.sh, gsd-context-monitor.js) - Format stdin/stdout des hooks command verifie, confirme les champs JSON
|
||||
|
||||
## Metadata
|
||||
|
||||
**Confidence breakdown:**
|
||||
- Standard stack: HIGH - stdlib Go, pas de dependance externe
|
||||
- Architecture: HIGH - Pattern hook HTTP verifie dans la doc officielle, integration daemon existante claire
|
||||
- Pitfalls: HIGH - Verifies par inspection du code existant et des hooks deja configures
|
||||
|
||||
**Research date:** 2026-03-23
|
||||
**Valid until:** 2026-04-23 (stable, pas de breaking changes attendus)
|
||||
Reference in New Issue
Block a user