Chat 'ChatTitle(text=Event Emission with Scoped Structs in Rust, isCustom=true)' (a9618904-76eb-486f-94d0-246ebbea4a8c)
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Current date: 2026-07-13
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Messages: 4
=======================================================================================================================

==== UserMessageImpl #1 ====
User: 
J'aimerais emit un event qui transmet une struct avec le {scope, event initial) qui prend le nom du topic et qui ajoute $topic$ (ou un truc comme ça)
Attachments:
Attachment Name: event_bus_throughput.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
#[derive(Clone)]
struct SmallEvent {
    value: u64,
}
Attachment Name: event_bus_throughput.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
#[derive(Clone)]
struct VecEvent {
    id: u64,
    payload: Vec<u8>,
}
Attachment Name: bus.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ScopeValue {
    String(String),
    Uuid(Uuid),
}
Attachment Name: bus.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Scope {
    key: String,
    value: ScopeValue,
}
Attachment Name: bus.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
/// Raw event type: an atomic reference-counted pointer to any value.
pub type AnyEvent = Arc<dyn Any + Send + Sync>;
Attachment Name: event_bus_throughput.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
#[derive(Clone)]
struct StringEvent {
    id: u64,
    name: String,
    message: String,
}
Attachment Name: events.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
#[derive(Serialize)]
pub struct GatewayEvent<T: Serialize> {
    pub namespace: &'static str,
    pub action: &'static str,
    pub content: T,
}
Attachment Name: events.ts
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
export function emitGatewayEvent(namespace: string, action: string, content: any) {
  // On construit le nom de l'événement de manière cohérente : gateway:message
  const eventName = `gateway:${namespace.toLowerCase()}`;
  bus.dispatchEvent(new CustomEvent(eventName, {detail: {action, content}}));
}
Attachment Name: events.ts
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
export function onGatewayEvent(namespace: string, callback: (payload: { action: string, content: any }) => void) {
  const eventName = `gateway:${namespace.toLowerCase()}`;
  const wrapper = (e: Event) => {
    const customEvent = e as CustomEvent;
    callback(customEvent.detail);
  };
  bus.addEventListener(eventName, wrapper);

  // Retourne une fonction pour se désabonner facilement si besoin
  return () => bus.removeEventListener(eventName, wrapper);
}
Attachment Name: Console Selection
Attachments Kind: Visible
Attachments Source: Other / SelectionChatAttachment
Attachments Text:
pub fn emit_scoped<T>(&self, topic: &str, scopes: impl IntoIterator<Item = Scope>, event: T)
    where
        T: Any + Send + Sync + 'static,
    {
        let event: AnyEvent = Arc::new(event);

        // Émission sur le topic général.
        self.emit_arc(topic, Arc::clone(&event));

        // Émission sur chaque topic scoped.
        for scope in scopes {
            let scoped_topic = format!("{}:{}:{}", scope.key, scope.value.into_string(), topic);

            self.emit_arc(&scoped_topic, Arc::clone(&event));
        }
    }
Attachment Name: Project View
Attachments Kind: Visible
Attachments Source: AutoUIPickerContextAttachmentSource / AutoloadedUIPickerVisibleChatAttachment
Attachments Text:
Project View content:
```
oxspeak_server
 .claude
 .junie
  plans
   gateway-event-bus-triggers.md
   migrate-seaorm-2-model-relations.md
   session-store-frontend-refactor.md
 event_bus
  benches
  src
   lib.rs
   bus.rs
   tests.rs
  Cargo.toml
 frontend
 migration
  src
   lib.rs
   main.rs
   m20220101_000001_create_table.rs
  Cargo.toml
  README.md
 src
  auth
  core
   mod.rs
   permission_sync.rs
   state.rs
  database
  http
  metrics
  models
   mod.rs
   attachment.rs
   category.rs
   channel.rs
   channel_role_permission.rs
   channel_user.rs
   channel_user_permission.rs
   computed_permission.rs
   message.rs
   prelude.rs
   role.rs
   role_user.rs
   server.rs
   server_role_permission.rs
   server_user.rs
   server_user_permission.rs
   user.rs
  repositories
   mod.rs
   category.rs
   channel.rs
   computed_permission.rs
   group.rs
   message.rs
   README.md
   server.rs
   types.rs
   user.rs
  routes
   attachment
   auth
   category
   channel
    mod.rs
    domain.rs
    dto.rs
    handlers.rs
    mapper.rs
    routes.rs
    service.rs
   core
   gateway
   group
   message
   server
    mod.rs
    domain.rs
    dto.rs
    handlers.rs
    mapper.rs
    routes.rs
    service.rs
   user
   mod.rs
   openapi.rs
  udp
  lib.rs
  main.rs
  config.rs
  permissions.rs
  permissions_old.rs
 Cargo.lock
 Cargo.toml
 config.toml
 test
External Libraries
Scratches and Consoles
```
Attachment Name: Information about open file in the editor
Attachments Kind: Visible
Attachments Source: CurrentFileRetriever / CurrentFileChatAttachment
Attachments Text:
````rust
use std::any::Any;
use std::future::Future;
use std::sync::Arc;

use parking_lot::RwLock;
use std::collections::HashMap;
use std::iter;
use tokio::sync::broadcast;
use tokio::task::JoinHandle;
// use tracing::log::kv::{Key, Value};
use tracing::{debug, trace, warn};
use uuid::Uuid;

/// Raw event type: an atomic reference-counted pointer to any value.
pub type AnyEvent = Arc<dyn Any + Send + Sync>;

/// Default buffer capacity for each broadcast channel.
const DEFAULT_CAPACITY: usize = 64;

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ScopeValue {
    String(String),
    Uuid(Uuid),
}
impl ScopeValue {
    fn into_string(self) -> String {
        match self {
            Self::String(value) => value,
            Self::Uuid(value) => value.to_string(),
        }
    }
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Scope {
    key: String,
    value: ScopeValue,
}
impl IntoIterator for Scope {
    type Item = Scope;
    type IntoIter = iter::Once<Scope>;

    fn into_iter(self) -> Self::IntoIter {
        iter::once(self)
    }
}

/// The central event bus.
///
/// Share it via `Arc<EventBus>` across modules.
/// Each topic has its own broadcast channel: only subscribers of the matching
/// topic are woken up on `emit` (targeted wake-up).
///
/// # Minimal example — sync callback
/// ```rust,no_run
/// use std::sync::Arc;
/// use oxspeak_server_lib::event_bus::EventBus;
///
/// #[derive(Clone, Debug)]
/// struct User { name: String }
///
/// # tokio_test::block_on(async {
/// let bus = Arc::new(EventBus::new());
///
/// bus.on::<User>("user-connected", |user| {
///     println!("Connected: {:?}", user);
/// });
///
/// bus.emit("user-connected", User { name: "Alice".into() });
/// # tokio::time::sleep(std::time::Duration::from_millis(10)).await;
/// # });
/// ```
///
/// # Example — async callback
/// ```rust,no_run
/// use std::sync::Arc;
/// use oxspeak_server_lib::event_bus::EventBus;
///
/// #[derive(Clone, Debug)]
/// struct User { name: String }
///
/// # tokio_test::block_on(async {
/// let bus = Arc::new(EventBus::new());
///
/// bus.on_async::<User, _, _>("user-connected", |user| async move {
///     println!("(async) Connected: {:?}", user);
/// });
///
/// bus.emit("user-connected", User { name: "Bob".into() });
/// # tokio::time::sleep(std::time::Duration::from_millis(10)).await;
/// # });
/// ```
#[derive(Debug)]
pub struct EventBus {
    /// Channels indexed by exact topic.
    channels: RwLock<HashMap<String, broadcast::Sender<AnyEvent>>>,
    capacity: usize,
}

impl EventBus {
    /// Creates a bus with the default capacity (64 messages per channel).
    pub fn new() -> Self {
        debug!(
            "EventBus created with default capacity ({})",
            DEFAULT_CAPACITY
        );
        Self {
            channels: RwLock::new(HashMap::new()),
            capacity: DEFAULT_CAPACITY,
        }
    }

    /// Creates a bus with a custom buffer capacity.
    pub fn with_capacity(capacity: usize) -> Self {
        debug!("EventBus created with capacity {}", capacity);
        Self {
            channels: RwLock::new(HashMap::new()),
            capacity,
        }
    }

    // ─────────────────────────────────────────────────────────────────────────
    // Internal
    // ─────────────────────────────────────────────────────────────────────────

    fn get_or_create_sender(&self, topic: &str) -> broadcast::Sender<AnyEvent> {
        {
            let channels = self.channels.read();
            if let Some(tx) = channels.get(topic) {
                return tx.clone();
            }
        }
        let mut channels = self.channels.write();
        let created = !channels.contains_key(topic);
        let tx = channels
            .entry(topic.to_string())
            .or_insert_with(|| {
                let (tx, _) = broadcast::channel(self.capacity);
                tx
            })
            .clone();
        if created {
            debug!(topic, "New broadcast channel created");
        }
        tx
    }

    // ─────────────────────────────────────────────────────────────────────────
    // Emission
    // ─────────────────────────────────────────────────────────────────────────

    /// Emits an event on a topic.
    ///
    /// - Pushes the event into the exact-topic channel (if subscribers exist).
    /// - If nobody is listening, the event is silently dropped.
    ///
    /// # Example
    /// ```rust,no_run
    /// # use std::sync::Arc;
    /// # use oxspeak_server_lib::event_bus::EventBus;
    /// # #[derive(Clone)] struct User;
    /// # let bus = Arc::new(EventBus::new());
    /// bus.emit("user-connected", User);
    /// bus.emit("user-deleted", uuid::Uuid::new_v4());
    /// ```
    pub fn emit<T: Any + Send + Sync + 'static>(&self, topic: &str, event: T) {
        trace!(topic, "Emitting event");
        let event: AnyEvent = Arc::new(event);

        self.emit_arc(topic, event);
    }

    // todo : undocumented...
    pub fn emit_scoped<T>(&self, topic: &str, scopes: impl IntoIterator<Item = Scope>, event: T)
    where
        T: Any + Send + Sync + 'static,
    {
        let event: AnyEvent = Arc::new(event);

        // Émission sur le topic général.
        self.emit_arc(topic, Arc::clone(&event));

        // Émission sur chaque topic scoped.
        for scope in scopes {
            let scoped_topic = format!("{}:{}:{}", scope.key, scope.value.into_string(), topic);

            self.emit_arc(&scoped_topic, Arc::clone(&event));
        }
    }

    // todo : undocumented...
    fn emit_arc(&self, topic: &str, event: AnyEvent) {
        trace!(topic, "Emitting event");

        if let Some(tx) = self.channels.read().get(topic) {
            let receiver_count = tx.receiver_count();
            let _ = tx.send(event);

            trace!(topic, receiver_count, "Event delivered to channel");
        }
    }

    // ─────────────────────────────────────────────────────────────────────────
    // Subscription — callbacks (main API)
    // ─────────────────────────────────────────────────────────────────────────

    /// Subscribes to a topic and calls `handler` on each event of type `T`.
    ///
    /// The handler runs in a dedicated Tokio task (fire-and-forget).
    /// Events of a different type are silently ignored.
    /// Returns a [`JoinHandle`] to cancel the subscription if needed.
    ///
    /// # Example
    /// ```rust,no_run
    /// # use std::sync::Arc;
    /// # use oxspeak_server_lib::event_bus::EventBus;
    /// # #[derive(Clone, Debug)] struct User { name: String }
    /// # let bus = Arc::new(EventBus::new());
    /// bus.on::<User>("user-connected", |user| {
    ///     println!("Connected: {:?}", user);
    /// });
    /// ```
    pub fn on<T, F>(&self, topic: &str, handler: F) -> JoinHandle<()>
    where
        T: Any + Send + Sync + Clone + 'static,
        F: Fn(T) + Send + Sync + 'static,
    {
        let mut rx = self.get_or_create_sender(topic).subscribe();
        let topic_owned = topic.to_string();

        debug!(topic, "Sync subscriber registered");

        tokio::spawn(async move {
            loop {
                match rx.recv().await {
                    Ok(evt) => {
                        if let Some(typed) = evt.downcast_ref::<T>() {
                            trace!(topic = topic_owned, "Sync handler invoked");
                            handler(typed.clone());
                        }
                    }
                    Err(broadcast::error::RecvError::Lagged(n)) => {
                        warn!(
                            topic = topic_owned,
                            skipped = n,
                            "Subscriber lagged, messages dropped"
                        );
                    }
                    Err(broadcast::error::RecvError::Closed) => {
                        debug!(
                            topic = topic_owned,
                            "Channel closed, sync subscriber exiting"
                        );
                        break;
                    }
                }
            }
        })
    }

    /// Subscribes to a topic and calls an **async** handler on each event of type `T`.
    ///
    /// Ideal for performing async operations in the handler
    /// (DB query, HTTP call, WebSocket broadcast, …).
    /// Returns a [`JoinHandle`] to cancel the subscription if needed.
    ///
    /// # Example
    /// ```rust,no_run
    /// # use std::sync::Arc;
    /// # use oxspeak_server_lib::event_bus::EventBus;
    /// # #[derive(Clone, Debug)] struct User { name: String }
    /// # let bus = Arc::new(EventBus::new());
    /// bus.on_async::<User, _, _>("user-connected", |user| async move {
    ///     println!("(async) Connected: {:?}", user);
    ///     // async work here: DB query, HTTP, etc.
    /// });
    /// ```
    pub fn on_async<T, F, Fut>(&self, topic: &str, handler: F) -> JoinHandle<()>
    where
        T: Any + Send + Sync + Clone + 'static,
        F: Fn(T) -> Fut + Send + Sync + 'static,
        Fut: Future<Output = ()> + Send + 'static,
    {
        let mut rx = self.get_or_create_sender(topic).subscribe();
        let topic_owned = topic.to_string();

        debug!(topic, "Async subscriber registered");

        tokio::spawn(async move {
            loop {
                match rx.recv().await {
                    Ok(evt) => {
                        if let Some(typed) = evt.downcast_ref::<T>() {
                            trace!(topic = topic_owned, "Async handler invoked");
                            handler(typed.clone()).await;
                        }
                    }
                    Err(broadcast::error::RecvError::Lagged(n)) => {
                        warn!(
                            topic = topic_owned,
                            skipped = n,
                            "Subscriber lagged, messages dropped"
                        );
                    }
                    Err(broadcast::error::RecvError::Closed) => {
                        debug!(
                            topic = topic_owned,
                            "Channel closed, async subscriber exiting"
                        );
                        break;
                    }
                }
            }
        })
    }

    // ─────────────────────────────────────────────────────────────────────────
    // Subscription — low-level access (advanced use cases)
    // ─────────────────────────────────────────────────────────────────────────

    /// Returns a raw [`AnyEvent`] receiver to manage the loop yourself.
    ///
    /// Useful with the [`match_event!`][crate::match_event] macro to handle
    /// multiple different types on the same topic.
    ///
    /// # Example
    /// ```rust,no_run
    /// # use std::sync::Arc;
    /// # use oxspeak_server_lib::event_bus::EventBus;
    /// # use oxspeak_server_lib::match_event;
    /// # #[derive(Clone, Debug)] struct User { name: String }
    /// # #[derive(Clone, Debug)] struct UdpMetric { value: f32 }
    /// # let bus = Arc::new(EventBus::new());
    /// # tokio_test::block_on(async {
    /// let mut rx = bus.on_raw("user-connected");
    /// bus.emit("user-connected", User { name: "Alice".into() });
    ///
    /// if let Ok(evt) = rx.recv().await {
    ///     match_event!(evt,
    ///         User      => |u| println!("User: {:?}", u),
    ///         UdpMetric => |m| println!("Metric: {:?}", m),
    ///     );
    /// }
    /// # });
    /// ```
    pub fn on_raw(&self, topic: &str) -> broadcast::Receiver<AnyEvent> {
        debug!(topic, "Raw subscriber registered");
        self.get_or_create_sender(topic).subscribe()
    }

    // ─────────────────────────────────────────────────────────────────────────
    // Utilities
    // ─────────────────────────────────────────────────────────────────────────

    /// Returns the list of currently registered topics.
    pub fn topics(&self) -> Vec<String> {
        self.channels.read().keys().cloned().collect()
    }
}

impl Default for EventBus {
    fn default() -> Self {
        Self::new()
    }
}

````
Attachment Name: events.ts
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```typescript
export const bus = new EventTarget();

export function emitGatewayEvent(namespace: string, action: string, content: any) {
  // On construit le nom de l'événement de manière cohérente : gateway:message
  const eventName = `gateway:${namespace.toLowerCase()}`;
  bus.dispatchEvent(new CustomEvent(eventName, {detail: {action, content}}));
}

export function onGatewayEvent(namespace: string, callback: (payload: { action: string, content: any }) => void) {
  const eventName = `gateway:${namespace.toLowerCase()}`;
  const wrapper = (e: Event) => {
    const customEvent = e as CustomEvent;
    callback(customEvent.detail);
  };
  bus.addEventListener(eventName, wrapper);

  // Retourne une fonction pour se désabonner facilement si besoin
  return () => bus.removeEventListener(eventName, wrapper);
}
```
Attachment Name: permission_sync.rs
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```rust
use crate::repositories::Repositories;
use event_bus::EventBus;
use std::sync::Arc;

// list of all events :
// server_user_created
// server_user_deleted
//
// role_user_created
// role_user_deleted
//
// server_role_permission_created
// server_role_permission_updated
// server_role_permission_deleted
//
// server_user_permission_created
// server_user_permission_updated
// server_user_permission_deleted
//
// channel_role_permission_created
// channel_role_permission_updated
// channel_role_permission_deleted
//
// channel_user_permission_created
// channel_user_permission_updated
// channel_user_permission_deleted
//
// channel_created
// channel_deleted

#[derive(Debug, Clone)]
pub struct PermissionSyncService {
    repositories: Arc<Repositories>,
    event_bus: Arc<EventBus>,
}

impl PermissionSyncService {
    pub fn new(repositories: Arc<Repositories>, event_bus: Arc<EventBus>) -> Self {
        Self {
            repositories,
            event_bus,
        }
    }

    pub fn listen(&self) {}
}

```
Attachment Name: lib.rs
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
````rust
/// Downcasts an [`AnyEvent`] to one or more concrete types and executes
/// the matching closure if the type matches.
///
/// Non-matching branches are silently ignored.
///
/// # Syntax
/// ```text
/// match_event!(evt, Type1 => |val| { ... }, Type2 => |val| { ... })
/// ```
///
/// # Example
/// ```rust,no_run
/// # use std::sync::Arc;
/// # use oxspeak_server_lib::event_bus::EventBus;
/// # use oxspeak_server_lib::match_event;
/// # #[derive(Clone, Debug)] struct User { name: String }
/// # #[derive(Clone, Debug)] struct UdpMetric { value: f32 }
/// # let bus = Arc::new(EventBus::new());
/// # tokio_test::block_on(async {
/// let mut rx = bus.on_raw("user-connected");
/// bus.emit("user-connected", User { name: "Alice".into() });
///
/// if let Ok(evt) = rx.recv().await {
///     match_event!(evt,
///         User      => |u| println!("User: {:?}", u),
///         UdpMetric => |m| println!("Metric: {:?}", m),
///     );
/// }
/// # });
/// ```
#[macro_export]
macro_rules! match_event {
    ($evt:expr, $($type:ty => $handler:expr),+ $(,)?) => {
        $(
            if let Some(val) = ($evt).downcast_ref::<$type>() {
                ($handler)(val.clone());
            } else
        )+
        {
            // No matching type → silently ignored
        }
    };
}

mod bus;
pub use bus::{AnyEvent, EventBus, Scope, ScopeValue};

#[cfg(test)]
mod tests;

````
Attachment Name: Cargo.toml
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```toml
[package]
name = "oxspeak_server"
version = "0.1.0"
edition = "2024"

[lib]
name = "oxspeak_server_lib"
crate-type = ["rlib"]

[workspace]
members = [".", "migration", "event_bus"]

[dependencies]
tokio = { version = "1.52.3", features = ["full"] }
axum = { version = "0.8", features = ["ws"] }
axum-extra = { version = "0.12.6", features = ["cookie"] }
config = "0.15.25"
sea-orm = { version = "2.0.0-rc.42", features = ["sqlx-sqlite", "sqlx-postgres", "sqlx-mysql", "runtime-tokio", "with-chrono", "with-uuid", "with-json", "schema-sync"] }
migration = { path = "migration" }
event_bus = { path = "event_bus" }
parking_lot = "0.12.5"
serde = "1.0.228"
serde_json = "1.0.150"
toml = "1.1.2"
uuid = { version = "1.23.5", features = ["v4", "v7", "fast-rng", "serde"] }
tracing = "0.1.44"
tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt", "time"] }
thiserror = "2"
utoipa = { version = "5", features = ["uuid", "chrono"] }
utoipa-swagger-ui = { version = "9", features = ["axum"] }
log = "0.4"
bitflags = "2.13.0"
argon2 = { version = "0.6.0-rc.8", features = ["password-hash"] }
jsonwebtoken = { version = "10.4.0", features = ["aws_lc_rs"] }
tower = { version = "0.5", features = ["util"] }
tower-http = { version = "0.7.0", features = ["catch-panic", "cors", "trace"] }
chrono = "0.4.45"
validator = { version = "0.20.0", features = ["derive"] }
async-trait = "0.1.89"
anyhow = "1.0.103"
futures-util = "0.3"
form_urlencoded = "1.2.2"
time = "0.3.53"

```
Attachment Name: message.ts
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```typescript
import {defineStore} from "pinia";
import {useApi} from "@/composables/useApi.ts";
import {onGatewayEvent} from "@/plugins/events.ts";

interface Message {
  id: string;
  channel_id: string;
  user_id: string;
  content: string;
  created_at: string;
  updated_at: string | null;
  reply_to_id: string | null;
}

export const useMessageStore = defineStore("message", {
  state: () => ({
    messages: [] as Message[],
    loading: false,
  }),
  actions: {
    async fetchMessages(channel_id: string) {
      this.loading = true;

      // Query params
      let params = new URLSearchParams();
      params.append("channel_id", channel_id);
      const queryString = params.toString();

      try {
        const api = useApi();
        // Utilisation du paramètre pour cibler le channel
        const response = await api.get(`/messages${queryString ? `?${queryString}` : ""}`);
        this.messages = await response.json();
      } catch (error) {
        console.error("Erreur lors du chargement des messages:", error);
      } finally {
        this.loading = false;
      }
    },
    async sendMessage(channelId: string, content: string) {
      const api = useApi();
      console.log("channelId", channelId);
      try {
        // Envoi au serveur pour persistance
        const response = await api.post('/messages', {
          channel_id: channelId,
          content: content,
          reply_to_id: null
        });
        const newMessage = await response.json();

        // Ajout local immédiat (optimistic update)
        // this.messages.push(newMessage);
      } catch (error) {
        console.error("Erreur lors de l'envoi du message:", error);
        throw error;
      }
    },
    reset() {
      this.messages = [];
    }
  }
});

onGatewayEvent("Message", (payload) => {
  const store = useMessageStore();
  switch (payload.action) {
    case "add":
      const exists = store.messages.some(m => m.id === payload.content.id);
      if (!exists) {
        store.messages.push(payload.content);
      }
      break;
    case "update":
      const updateIndex = store.messages.findIndex(m => m.id === payload.content.id);
      if (updateIndex !== -1) {
        store.messages[updateIndex] = payload.content;
      }
      break;
    case "remove":
      const removeIndex = store.messages.findIndex(m => m.id === payload.content);
      if (removeIndex !== -1) {
        store.messages.splice(removeIndex, 1);
      }
      break;
    default:
      console.warn("Action non gérée :", payload.action);
  }
})
```
Attachment Name: gateway.ts
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```typescript
import {defineStore} from 'pinia';
import {useAppStore} from "@/stores/app.ts";
import {emitGatewayEvent} from "@/plugins/events.ts";

type GatewayStatus = 'disconnected' | 'connecting' | 'connected' | 'error'

export const useGatewayStore = defineStore('gateway', {
  state: () => ({
    socket: null as WebSocket | null,
    status: 'disconnected' as GatewayStatus,
    reconnectAttempts: 0,
    shouldReconnect: false,
    reconnectTimer: null as number | null,
  }),

  actions: {
    async connect() {
      if (this.status === 'connecting' || this.status === 'connected') {
        return
      }

      const appStore = useAppStore()

      this.status = 'connecting'
      this.shouldReconnect = true
      if (this.reconnectTimer) {
        window.clearTimeout(this.reconnectTimer)
        this.reconnectTimer = null
      }

      const apiUri = appStore.baseurl ? new URL(appStore.baseurl) : new URL(window.location.href)
      const wsProtocol = apiUri.protocol === 'https:' ? 'wss:' : 'ws:'
      const wsUrl = `${wsProtocol}//${apiUri.host}/ws/gateway`
      const socket = new WebSocket(wsUrl)

      socket.onopen = () => {
        this.status = 'connected'
        this.reconnectAttempts = 0

      }

      socket.onclose = () => {
        this.status = 'disconnected'
        if (this.socket === socket) {
          this.socket = null
        }
        if (this.shouldReconnect) {
          this.scheduleReconnect()
        }
      }

      socket.onerror = () => {
        this.status = 'error'
      }

      socket.onmessage = event => {
        this.handleMessage(event.data)
      }

      this.socket = socket
    },

    async disconnect() {
      this.shouldReconnect = false
      if (this.reconnectTimer) {
        window.clearTimeout(this.reconnectTimer)
        this.reconnectTimer = null
      }
      this.socket?.close()
      this.socket = null
      this.status = 'disconnected'
      this.reconnectAttempts = 0
    },

    async send(payload: object) {
      if (!this.socket || this.status !== 'connected') {
        console.warn('WebSocket is not connected')
        return
      }

      this.socket.send(JSON.stringify(payload))
    },

    async handleMessage(rawData: string) {
      try {
        const data = JSON.parse(rawData)
        emitGatewayEvent(data.namespace, data.action, data.content)
      } catch (error) {
        console.error('Error parsing WebSocket message:', error)
      }
    },

    async scheduleReconnect() {
      const delay = Math.min(1000 * 2 ** this.reconnectAttempts, 30000)
      this.reconnectAttempts += 1

      this.reconnectTimer = window.setTimeout(() => {
        this.reconnectTimer = null
        this.connect()
      }, delay)
    },
  }
});
```
Attachment Name: handlers.rs
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```rust
use super::dto::{CreateMessageRequest, MessageQueryParams, MessageResponse, UpdateMessageRequest};
use crate::core::state::AppState;
use crate::http::context::CurrentUser;
use crate::http::error::HTTPError;
use crate::routes::message::mapper;
use axum::{
    extract::{Path, Query, State},
    http::StatusCode,
    Json,
};
use uuid::Uuid;

/// Liste tous les messages
#[utoipa::path(
    get,
    path = "/messages",
    responses(
        (status = 200, description = "Liste des messages récupérée avec succès", body = [MessageResponse]),
        (status = 500, description = "Erreur interne du serveur")
    ),
    params(
        MessageQueryParams
    ),
    tag = "Messages"
)]
pub async fn get_all(
    State(state): State<AppState>,
    Query(filters): Query<MessageQueryParams>,
) -> Result<Json<Vec<MessageResponse>>, HTTPError> {
    let params = mapper::query_params_to_message_filter(filters);
    let messages = state.repositories.message.filter(params).await?;
    Ok(Json(
        messages
            .into_iter()
            .map(mapper::message_model_to_message_response)
            .collect(),
    ))
}

/// Récupère un message par son ID
#[utoipa::path(
    get,
    path = "/messages/{id}",
    responses(
        (status = 200, description = "Message trouvé", body = MessageResponse),
        (status = 404, description = "Message non trouvé"),
        (status = 500, description = "Erreur interne du serveur")
    ),
    params(
        ("id" = Uuid, Path, description = "ID du message")
    ),
    tag = "Messages"
)]
pub async fn get_by_id(
    State(state): State<AppState>,
    Path(id): Path<Uuid>,
) -> Result<Json<MessageResponse>, HTTPError> {
    let message = state
        .repositories
        .message
        .get_by_id(id)
        .await?
        .ok_or(HTTPError::NotFound)?;

    Ok(Json(mapper::message_model_to_message_response(message)))
}

/// Crée un nouveau message
#[utoipa::path(
    post,
    path = "/messages",
    request_body = CreateMessageRequest,
    responses(
        (status = 201, description = "Message créé avec succès", body = MessageResponse),
        (status = 400, description = "Données invalides (canal non trouvé)"),
        (status = 500, description = "Erreur interne du serveur")
    ),
    tag = "Messages",
    security(
        ("bearerAuth" = [])
    )
)]
pub async fn create(
    user: CurrentUser,
    State(state): State<AppState>,
    Json(payload): Json<CreateMessageRequest>,
) -> Result<(StatusCode, Json<MessageResponse>), HTTPError> {
    // Vérifier que le canal existe
    state
        .repositories
        .channel
        .get_by_id(payload.channel_id)
        .await?
        .ok_or(HTTPError::BadRequest("Channel not found".to_string()))?;

    // Optionnel: vérifier reply_to_id
    if let Some(reply_id) = payload.reply_to_id {
        state
            .repositories
            .message
            .get_by_id(reply_id)
            .await?
            .ok_or(HTTPError::BadRequest(
                "Parent message not found".to_string(),
            ))?;
    }

    let active_model = mapper::create_request_to_am(user.id, payload);
    let message = state.repositories.message.create(active_model).await?;
    Ok((
        StatusCode::CREATED,
        Json(mapper::message_model_to_message_response(message)),
    ))
}

/// Met à jour un message existant
#[utoipa::path(
    put,
    path = "/messages/{id}",
    request_body = UpdateMessageRequest,
    responses(
        (status = 200, description = "Message mis à jour avec succès", body = MessageResponse),
        (status = 403, description = "Interdit (pas l'auteur)"),
        (status = 404, description = "Message non trouvé"),
        (status = 500, description = "Erreur interne du serveur")
    ),
    params(
        ("id" = Uuid, Path, description = "ID du message")
    ),
    tag = "Messages",
    security(
        ("bearerAuth" = [])
    )
)]
pub async fn update(
    user: CurrentUser,
    State(state): State<AppState>,
    Path(id): Path<Uuid>,
    Json(payload): Json<UpdateMessageRequest>,
) -> Result<Json<MessageResponse>, HTTPError> {
    // Vérifier l'existence
    let message = state
        .repositories
        .message
        .get_by_id(id)
        .await?
        .ok_or(HTTPError::NotFound)?;

    // Vérifier que l'utilisateur est l'auteur
    if message.user_id != user.id && !user.is_superuser {
        return Err(HTTPError::Forbidden);
    }

    let active_model = mapper::update_request_to_am(message, payload);
    let message = state.repositories.message.update(active_model).await?;

    Ok(Json(mapper::message_model_to_message_response(message)))
}

/// Supprime un message
#[utoipa::path(
    delete,
    path = "/messages/{id}",
    responses(
        (status = 204, description = "Message supprimé avec succès"),
        (status = 403, description = "Interdit (pas l'auteur ou admin)"),
        (status = 404, description = "Message non trouvé"),
        (status = 500, description = "Erreur interne du serveur")
    ),
    params(
        ("id" = Uuid, Path, description = "ID du message")
    ),
    tag = "Messages",
    security(
        ("bearerAuth" = [])
    )
)]
pub async fn delete(
    user: CurrentUser,
    State(state): State<AppState>,
    Path(id): Path<Uuid>,
) -> Result<StatusCode, HTTPError> {
    // Vérifier l'existence pour l'autorisation
    let message = state
        .repositories
        .message
        .get_by_id(id)
        .await?
        .ok_or(HTTPError::NotFound)?;

    // Autoriser si auteur ou superuser
    if message.user_id != user.id && !user.is_superuser {
        return Err(HTTPError::Forbidden);
    }

    if state.repositories.message.delete(id).await? {
        Ok(StatusCode::NO_CONTENT)
    } else {
        Err(HTTPError::NotFound)
    }
}

```
Attachment Name: mod.rs
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```rust
use crate::models::category;
use crate::models::channel;
use crate::models::message;
use crate::models::server;
use crate::models::user::Model as User;
use crate::routes::category::mapper::category_model_to_category_response;
use crate::routes::channel::mapper::channel_model_to_channel_response;
use crate::routes::message::mapper::message_model_to_message_response;
use crate::routes::server::mapper::server_model_to_server_response;
use axum::extract::ws::Message;
use event_bus::EventBus;
use events::GatewayEvent;
use parking_lot::RwLock;
use std::collections::HashMap;
use std::sync::Arc;
use tokio::sync::mpsc;
use tokio::task::JoinHandle;
use uuid::Uuid;

pub mod events;
pub mod handlers;
pub mod routes;

#[derive(Debug, Default)]
pub struct GatewayManager {
    // {UserID: {connection_id: GatewayClient}}
    pub clients: RwLock<HashMap<Uuid, HashMap<Uuid, GatewayClient>>>,
}

#[derive(Debug, Clone)]
pub struct GatewayClient {
    user: User,
    connection_id: Uuid,
    pub sender: mpsc::UnboundedSender<Message>,
    pub event_bus: Arc<EventBus>,
    _event_handles: Vec<Arc<JoinHandle<()>>>,
}

impl GatewayManager {
    fn add_client(&self, gateway_client: GatewayClient) {
        let mut clients = self.clients.write();
        let user_id = gateway_client.user.id;
        clients
            .entry(user_id)
            .or_insert_with(HashMap::new)
            .insert(gateway_client.connection_id, gateway_client);
    }

    fn remove_client(&self, gateway_client: GatewayClient) {
        let mut clients = self.clients.write();
        if let Some(client_list) = clients.get_mut(&gateway_client.user.id) {
            client_list.remove(&gateway_client.connection_id);
        }
    }
}

impl GatewayClient {
    pub fn new(
        user: User,
        sender: mpsc::UnboundedSender<Message>,
        event_bus: Arc<EventBus>,
    ) -> Self {
        let connection_id = Uuid::new_v4();
        Self {
            user,
            connection_id,
            sender,
            event_bus,
            _event_handles: Vec::new(),
        }
    }

    fn subscribe_event<T, F, R>(
        &self,
        event_name: &'static str,
        namespace: &'static str,
        action: &'static str,
        mapper: F,
    ) -> Arc<JoinHandle<()>>
    where
        T: Clone + Send + Sync + 'static,
        R: serde::Serialize + Send + 'static,
        F: Fn(T) -> R + Send + Sync + 'static,
    {
        let sender = self.sender.clone();
        Arc::new(
            self.event_bus
                .on_async::<T, _, _>(event_name, move |payload| {
                    let sender = sender.clone();
                    let content = mapper(payload);
                    async move {
                        let event = GatewayEvent {
                            namespace,
                            action,
                            content,
                        };
                        if let Ok(json) = serde_json::to_string(&event) {
                            let _ = sender.send(Message::Text(json.into()));
                        }
                    }
                }),
        )
    }

    pub fn subscribe_to_events(&mut self) {
        let mut handles = Vec::new();

        // Message
        handles.push(self.subscribe_event(
            "message_created",
            "Message",
            "add",
            message_model_to_message_response,
        ));
        handles.push(self.subscribe_event(
            "message_updated",
            "Message",
            "update",
            message_model_to_message_response,
        ));
        handles.push(self.subscribe_event("message_deleted", "Message", "remove", |id: Uuid| id));

        // Channel
        handles.push(self.subscribe_event(
            "channel_created",
            "Channel",
            "add",
            channel_model_to_channel_response,
        ));
        handles.push(self.subscribe_event(
            "channel_updated",
            "Channel",
            "update",
            channel_model_to_channel_response,
        ));
        handles.push(self.subscribe_event("channel_deleted", "Channel", "remove", |id: Uuid| id));

        // Category
        handles.push(self.subscribe_event(
            "category_created",
            "Category",
            "add",
            category_model_to_category_response,
        ));
        handles.push(self.subscribe_event(
            "category_updated",
            "Category",
            "update",
            category_model_to_category_response,
        ));
        handles.push(self.subscribe_event("category_deleted", "Category", "remove", |id: Uuid| id));

        // Server
        handles.push(self.subscribe_event(
            "server_created",
            "Server",
            "add",
            server_model_to_server_response,
        ));
        handles.push(self.subscribe_event(
            "server_updated",
            "Server",
            "update",
            server_model_to_server_response,
        ));
        handles.push(self.subscribe_event("server_deleted", "Server", "remove", |id: Uuid| id));

        self._event_handles = handles;
    }

    pub fn unsubscribe_all(&mut self) {
        for handle in self._event_handles.drain(..) {
            handle.abort();
        }
    }

    async fn on_connect(&mut self) {
        tracing::info!("Client connected: {:?}", self.user);
        self.subscribe_to_events();
    }

    async fn on_disconnect(&mut self) {
        tracing::info!("Client disconnected: {:?}", self.user);
        self.unsubscribe_all();
    }

    async fn on_message(&self, message: Message) {
        match message {
            Message::Binary(content) => {}
            Message::Text(content) => {
                tracing::info!("Received text message: {}", content);
            }
            Message::Ping(_) => {}
            Message::Pong(_) => {}
            Message::Close(_) => {}
        }
    }
}

```
Attachment Name: computed_permission.rs
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```rust
use crate::models::{
    channel, channel_role_permission, channel_user_permission, computed_permission, role_user,
    server_role_permission, server_user, server_user_permission,
};
use crate::permissions::{ChannelPermission, ServerPermission};
use crate::repositories::{AnyResult, RepositoryContext};

use sea_orm::{ColumnTrait, EntityTrait, QueryFilter, QuerySelect, Set, TransactionTrait};
use std::collections::HashMap;
use std::sync::Arc;
use uuid::Uuid;

use crate::models::computed_permission::PermissionScopeType;

#[derive(Clone, Debug)]
pub struct ComputedPermissionRepository {
    pub context: Arc<RepositoryContext>,
}

impl ComputedPermissionRepository {
    pub async fn get_all(&self) -> AnyResult<Vec<computed_permission::Model>> {
        Ok(computed_permission::Entity::find()
            .all(&self.context.db)
            .await?)
    }

    /// Recalcule le cache de permissions pour tous les utilisateurs du serveur.
    pub async fn full_sync_server(&self, server_id: Uuid) -> AnyResult<()> {
        let user_ids = server_user::Entity::find()
            .filter(server_user::Column::ServerId.eq(server_id))
            .select_only()
            .column(server_user::Column::UserId)
            .into_tuple::<Uuid>()
            .all(&self.context.db)
            .await?;

        for user_id in user_ids {
            self.full_sync_user(user_id, server_id).await?;
        }

        Ok(())
    }

    /// Recalcule le cache de permissions d'un utilisateur sur un serveur.
    ///
    /// Les permissions effectives sont composées de :
    ///
    /// - permissions serveur accordées aux rôles de l'utilisateur ;
    /// - permissions serveur accordées directement à l'utilisateur ;
    /// - permissions de canal accordées aux rôles de l'utilisateur ;
    /// - permissions directes de l'utilisateur dans les canaux.
    pub async fn full_sync_user(&self, user_id: Uuid, server_id: Uuid) -> AnyResult<()> {
        // ---------------------------------------------------------------------
        // Rôles de l'utilisateur
        // ---------------------------------------------------------------------

        let role_ids = role_user::Entity::find()
            .filter(role_user::Column::UserId.eq(user_id))
            .select_only()
            .column(role_user::Column::RoleId)
            .into_tuple::<Uuid>()
            .all(&self.context.db)
            .await?;

        // ---------------------------------------------------------------------
        // Permissions serveur des rôles
        // ---------------------------------------------------------------------

        let mut server_permissions = ServerPermission::empty();

        if !role_ids.is_empty() {
            let role_permissions = server_role_permission::Entity::find()
                .filter(server_role_permission::Column::ServerId.eq(server_id))
                .filter(server_role_permission::Column::RoleId.is_in(role_ids.clone()))
                .all(&self.context.db)
                .await?;

            for permission in role_permissions {
                server_permissions |=
                    ServerPermission::from_bits_retain(permission.permissions as u64);
            }
        }

        // ---------------------------------------------------------------------
        // Permissions serveur directes de l'utilisateur
        // ---------------------------------------------------------------------

        if let Some(permission) = server_user_permission::Entity::find()
            .filter(server_user_permission::Column::ServerId.eq(server_id))
            .filter(server_user_permission::Column::UserId.eq(user_id))
            .one(&self.context.db)
            .await?
        {
            server_permissions |= ServerPermission::from_bits_retain(permission.permissions as u64);
        }

        // ---------------------------------------------------------------------
        // Canaux du serveur
        // ---------------------------------------------------------------------

        let channels = channel::Entity::find()
            .filter(channel::Column::ServerId.eq(server_id))
            .all(&self.context.db)
            .await?;

        let channel_ids: Vec<Uuid> = channels.iter().map(|channel| channel.id).collect();

        // ---------------------------------------------------------------------
        // Permissions de rôles pour tous les canaux
        // ---------------------------------------------------------------------

        let role_channel_permissions = if role_ids.is_empty() || channel_ids.is_empty() {
            Vec::new()
        } else {
            channel_role_permission::Entity::find()
                .filter(channel_role_permission::Column::ChannelId.is_in(channel_ids.clone()))
                .filter(channel_role_permission::Column::RoleId.is_in(role_ids))
                .all(&self.context.db)
                .await?
        };

        let mut permissions_by_channel: HashMap<Uuid, ChannelPermission> = HashMap::new();

        for permission in role_channel_permissions {
            permissions_by_channel
                .entry(permission.channel_id)
                .or_default()
                .insert(ChannelPermission::from_bits_retain(
                    permission.permissions as u64,
                ));
        }

        // ---------------------------------------------------------------------
        // Permissions directes de l'utilisateur pour tous les canaux
        // ---------------------------------------------------------------------

        let user_channel_permissions = if channel_ids.is_empty() {
            Vec::new()
        } else {
            channel_user_permission::Entity::find()
                .filter(channel_user_permission::Column::UserId.eq(user_id))
                .filter(channel_user_permission::Column::ChannelId.is_in(channel_ids))
                .all(&self.context.db)
                .await?
        };

        for permission in user_channel_permissions {
            permissions_by_channel
                .entry(permission.channel_id)
                .or_default()
                .insert(ChannelPermission::from_bits_retain(
                    permission.permissions as u64,
                ));
        }

        // ---------------------------------------------------------------------
        // Construction du cache
        // ---------------------------------------------------------------------

        let mut computed_permissions = Vec::with_capacity(channels.len().saturating_add(1));

        // Permissions au niveau serveur.
        computed_permissions.push(computed_permission::ActiveModel {
            user_id: Set(user_id),
            server_id: Set(server_id),
            scope_type: Set(PermissionScopeType::Server),
            resource_id: Set(server_id),
            permissions: Set(server_permissions.bits() as i64),
            ..Default::default()
        });

        // Permissions au niveau canal.
        for channel in channels {
            let channel_permissions = permissions_by_channel
                .remove(&channel.id)
                .unwrap_or_else(ChannelPermission::empty);

            computed_permissions.push(computed_permission::ActiveModel {
                user_id: Set(user_id),
                server_id: Set(server_id),
                scope_type: Set(PermissionScopeType::Channel),
                resource_id: Set(channel.id),
                permissions: Set(channel_permissions.bits() as i64),
                ..Default::default()
            });
        }

        // ---------------------------------------------------------------------
        // Remplacement atomique du cache
        // ---------------------------------------------------------------------

        self.context
            .db
            .transaction::<_, (), anyhow::Error>(|transaction| {
                Box::pin(async move {
                    computed_permission::Entity::delete_many()
                        .filter(computed_permission::Column::UserId.eq(user_id))
                        .filter(computed_permission::Column::ServerId.eq(server_id))
                        .exec(transaction)
                        .await?;

                    if !computed_permissions.is_empty() {
                        computed_permission::Entity::insert_many(computed_permissions)
                            .exec(transaction)
                            .await?;
                    }

                    Ok(())
                })
            })
            .await?;

        Ok(())
    }
}

```


kotlin.Unit

==== SimpleCompletableMessage #2 ====
Assistant: 
Je te conseille de créer une **enveloppe d’événement** qui contient :

- `topic` : le topic initial ;
- `scope` : le scope ayant déclenché l’émission ;
- `event` : l’événement original.

Ainsi, pour un événement initial `message_created` et un scope `channel:123`, le topic diffusé devient par exemple :

```text
channel:123:message_created
```

Et le payload reçu est :

```rust
ScopedEvent {
    topic: "message_created",
    scope: Scope {
        key: "channel",
        value: "123",
    },
    event: Message,
}
```

<llm-snippet-file>event_bus/src/bus.rs</llm-snippet-file>
```rust
// ... existing code ...

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ScopeValue {
    String(String),
    Uuid(Uuid),
}

impl ScopeValue {
    fn into_string(self) -> String {
        match self {
            Self::String(value) => value,
            Self::Uuid(value) => value.to_string(),
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Scope {
    pub key: String,
    pub value: ScopeValue,
}

#[derive(Debug, Clone)]
pub struct ScopedEvent<T> {
    pub topic: String,
    pub scope: Scope,
    pub event: T,
}

// ... existing code ...
```

Puis modifie `emit_scoped` afin que chaque topic scoped reçoive une instance de `ScopedEvent<T>` :

<llm-snippet-file>event_bus/src/bus.rs</llm-snippet-file>
```rust
// ... existing code ...

pub fn emit_scoped<T>(
    &self,
    topic: &str,
    scopes: impl IntoIterator<Item = Scope>,
    event: T,
)
where
    T: Any + Send + Sync + Clone + 'static,
{
    let topic_owned = topic.to_string();

    // Émission sur le topic général avec l'événement initial.
    self.emit(topic, event.clone());

    // Émission sur chaque topic scoped avec une enveloppe.
    for scope in scopes {
        let scoped_topic = format!(
            "{}:{}:{}",
            scope.key,
            scope.value.clone().into_string(),
            topic
        );

        let scoped_event = ScopedEvent {
            topic: topic_owned.clone(),
            scope,
            event: event.clone(),
        };

        self.emit(&scoped_topic, scoped_event);
    }
}

// ... existing code ...
```

Il faut également exporter `ScopedEvent` :

<llm-snippet-file>event_bus/src/lib.rs</llm-snippet-file>
```rust
// ... existing code ...

mod bus;

pub use bus::{
    AnyEvent,
    EventBus,
    Scope,
    ScopeValue,
    ScopedEvent,
};

// ... existing code ...
```

Tu pourras ensuite t’abonner à un événement scoped comme ceci :

```rust
use event_bus::{EventBus, Scope, ScopeValue, ScopedEvent};

let topic = "channel:123:message_created";

event_bus.on::<ScopedEvent<Message>, _, _>(topic, |payload| async move {
    println!("Topic initial : {}", payload.topic);
    println!("Scope : {:?}", payload.scope);
    println!("Message : {:?}", payload.event);
});
```

Pour éviter de devoir reconstruire manuellement les topics, tu peux aussi ajouter une méthode utilitaire à `Scope` :

<llm-snippet-file>event_bus/src/bus.rs</llm-snippet-file>
```rust
// ... existing code ...

impl Scope {
    pub fn topic(&self, topic: &str) -> String {
        format!(
            "{}:{}:{}",
            self.key,
            self.value.clone().into_string(),
            topic
        )
    }
}

impl IntoIterator for Scope {
    type Item = Scope;
    type IntoIter = iter::Once<Scope>;

    fn into_iter(self) -> Self::IntoIter {
        iter::once(self)
    }
}

// ... existing code ...
```

Et `emit_scoped` devient plus lisible :

```rust
for scope in scopes {
    let scoped_topic = scope.topic(topic);

    let scoped_event = ScopedEvent {
        topic: topic.to_string(),
        scope,
        event: event.clone(),
    };

    self.emit(&scoped_topic, scoped_event);
}
```

### Variante recommandée

Si tu veux que **tous les abonnés**, y compris ceux du topic général, reçoivent toujours la même structure, il vaut mieux envelopper également l’événement général :

```rust
pub struct EventEnvelope<T> {
    pub topic: String,
    pub scope: Option<Scope>,
    pub event: T,
}
```

Dans ce cas :

- événement général : `scope: None` ;
- événement scoped : `scope: Some(scope)`.

Cela évite d’avoir deux types différents selon le topic (`Message` sur le topic général et `ScopedEvent<Message>` sur le topic scoped).

kotlin.Unit

==== UserMessageImpl #3 ====
User: 
OOuais nan en fait j'aime pas, je pense que je vais creer un dossier event ou domain avec un ensemble de struct pour les events, ce sera mieux je pense.
Attachments:
Attachment Name: event_bus_throughput.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
#[derive(Clone)]
struct SmallEvent {
    value: u64,
}
Attachment Name: event_bus_throughput.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
#[derive(Clone)]
struct VecEvent {
    id: u64,
    payload: Vec<u8>,
}
Attachment Name: bus.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
/// Raw event type: an atomic reference-counted pointer to any value.
pub type AnyEvent = Arc<dyn Any + Send + Sync>;
Attachment Name: event_bus_throughput.rs
Attachments Kind: Visible
Attachments Source: LocalEmbeddingRetriever / RelatedCodeChatAttachmentWithFile
Attachments Text:
#[derive(Clone)]
struct StringEvent {
    id: u64,
    name: String,
    message: String,
}
Attachment Name: Project View
Attachments Kind: Visible
Attachments Source: AutoUIPickerContextAttachmentSource / AutoloadedUIPickerVisibleChatAttachment
Attachments Text:
Project View content:
```
oxspeak_server
 .claude
 .junie
  plans
   gateway-event-bus-triggers.md
   migrate-seaorm-2-model-relations.md
   session-store-frontend-refactor.md
 event_bus
  benches
  src
   lib.rs
   bus.rs
   tests.rs
  Cargo.toml
 frontend
 migration
  src
   lib.rs
   main.rs
   m20220101_000001_create_table.rs
  Cargo.toml
  README.md
 src
  auth
  core
   mod.rs
   permission_sync.rs
   state.rs
  database
  http
  metrics
  models
   mod.rs
   attachment.rs
   category.rs
   channel.rs
   channel_role_permission.rs
   channel_user.rs
   channel_user_permission.rs
   computed_permission.rs
   message.rs
   prelude.rs
   role.rs
   role_user.rs
   server.rs
   server_role_permission.rs
   server_user.rs
   server_user_permission.rs
   user.rs
  repositories
   mod.rs
   category.rs
   channel.rs
   computed_permission.rs
   group.rs
   message.rs
   README.md
   server.rs
   types.rs
   user.rs
  routes
   attachment
   auth
   category
   channel
    mod.rs
    domain.rs
    dto.rs
    handlers.rs
    mapper.rs
    routes.rs
    service.rs
   core
   gateway
   group
   message
   server
    mod.rs
    domain.rs
    dto.rs
    handlers.rs
    mapper.rs
    routes.rs
    service.rs
   user
   mod.rs
   openapi.rs
  udp
  lib.rs
  main.rs
  config.rs
  permissions.rs
  permissions_old.rs
 Cargo.lock
 Cargo.toml
 config.toml
 test
External Libraries
Scratches and Consoles
```
Attachment Name: events.ts
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```typescript
export const bus = new EventTarget();

export function emitGatewayEvent(namespace: string, action: string, content: any) {
  // On construit le nom de l'événement de manière cohérente : gateway:message
  const eventName = `gateway:${namespace.toLowerCase()}`;
  bus.dispatchEvent(new CustomEvent(eventName, {detail: {action, content}}));
}

export function onGatewayEvent(namespace: string, callback: (payload: { action: string, content: any }) => void) {
  const eventName = `gateway:${namespace.toLowerCase()}`;
  const wrapper = (e: Event) => {
    const customEvent = e as CustomEvent;
    callback(customEvent.detail);
  };
  bus.addEventListener(eventName, wrapper);

  // Retourne une fonction pour se désabonner facilement si besoin
  return () => bus.removeEventListener(eventName, wrapper);
}
```
Attachment Name: permission_sync.rs
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```rust
use crate::repositories::Repositories;
use event_bus::EventBus;
use std::sync::Arc;

// list of all events :
// server_user_created
// server_user_deleted
//
// role_user_created
// role_user_deleted
//
// server_role_permission_created
// server_role_permission_updated
// server_role_permission_deleted
//
// server_user_permission_created
// server_user_permission_updated
// server_user_permission_deleted
//
// channel_role_permission_created
// channel_role_permission_updated
// channel_role_permission_deleted
//
// channel_user_permission_created
// channel_user_permission_updated
// channel_user_permission_deleted
//
// channel_created
// channel_deleted

#[derive(Debug, Clone)]
pub struct PermissionSyncService {
    repositories: Arc<Repositories>,
    event_bus: Arc<EventBus>,
}

impl PermissionSyncService {
    pub fn new(repositories: Arc<Repositories>, event_bus: Arc<EventBus>) -> Self {
        Self {
            repositories,
            event_bus,
        }
    }

    pub fn listen(&self) {}
}

```
Attachment Name: Cargo.toml
Attachments Kind: Visible
Attachments Source: RecentFilesRetriever / FileChatAttachment
Attachments Text:
```toml
[package]
name = "oxspeak_server"
version = "0.1.0"
edition = "2024"

[lib]
name = "oxspeak_server_lib"
crate-type = ["rlib"]

[workspace]
members = [".", "migration", "event_bus"]

[dependencies]
tokio = { version = "1.52.3", features = ["full"] }
axum = { version = "0.8", features = ["ws"] }
axum-extra = { version = "0.12.6", features = ["cookie"] }
config = "0.15.25"
sea-orm = { version = "2.0.0-rc.42", features = ["sqlx-sqlite", "sqlx-postgres", "sqlx-mysql", "runtime-tokio", "with-chrono", "with-uuid", "with-json", "schema-sync"] }
migration = { path = "migration" }
event_bus = { path = "event_bus" }
parking_lot = "0.12.5"
serde = "1.0.228"
serde_json = "1.0.150"
toml = "1.1.2"
uuid = { version = "1.23.5", features = ["v4", "v7", "fast-rng", "serde"] }
tracing = "0.1.44"
tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt", "time"] }
thiserror = "2"
utoipa = { version = "5", features = ["uuid", "chrono"] }
utoipa-swagger-ui = { version = "9", features = ["axum"] }
log = "0.4"
bitflags = "2.13.0"
argon2 = { version = "0.6.0-rc.8", features = ["password-hash"] }
jsonwebtoken = { version = "10.4.0", features = ["aws_lc_rs"] }
tower = { version = "0.5", features = ["util"] }
tower-http = { version = "0.7.0", features = ["catch-panic", "cors", "trace"] }
chrono = "0.4.45"
validator = { version = "0.20.0", features = ["derive"] }
async-trait = "0.1.89"
anyhow = "1.0.103"
futures-util = "0.3"
form_urlencoded = "1.2.2"
time = "0.3.53"

```


kotlin.Unit

==== SimpleCompletableMessage #4 ====
Assistant: 
Oui, c’est probablement une meilleure séparation. Le bus devrait rester **générique** et ne pas connaître la structure métier des événements. Les événements peuvent vivre dans le projet principal, par exemple :

```text
src/
├── events/
│   ├── mod.rs
│   ├── message.rs
│   ├── channel.rs
│   ├── permission.rs
│   └── server.rs
```

Ou, si tu préfères le vocabulaire métier :

```text
src/
├── domain/
│   └── events/
│       ├── mod.rs
│       ├── message.rs
│       ├── channel.rs
│       └── permission.rs
```

Je choisirais plutôt `events/`, car ce dossier représente clairement les événements publiés dans l’application.

### Exemple

<llm-snippet-file>src/events/message.rs</llm-snippet-file>
```rust
use uuid::Uuid;

#[derive(Debug, Clone)]
pub struct MessageCreated {
    pub message_id: Uuid,
    pub channel_id: Uuid,
    pub user_id: Uuid,
}

#[derive(Debug, Clone)]
pub struct MessageUpdated {
    pub message_id: Uuid,
    pub channel_id: Uuid,
}

#[derive(Debug, Clone)]
pub struct MessageDeleted {
    pub message_id: Uuid,
    pub channel_id: Uuid,
}
```

<llm-snippet-file>src/events/channel.rs</llm-snippet-file>
```rust
use uuid::Uuid;

#[derive(Debug, Clone)]
pub struct ChannelCreated {
    pub channel_id: Uuid,
    pub server_id: Uuid,
}

#[derive(Debug, Clone)]
pub struct ChannelUpdated {
    pub channel_id: Uuid,
    pub server_id: Uuid,
}

#[derive(Debug, Clone)]
pub struct ChannelDeleted {
    pub channel_id: Uuid,
    pub server_id: Uuid,
}
```

Puis tu centralises les exports :

<llm-snippet-file>src/events/mod.rs</llm-snippet-file>
```rust
pub mod channel;
pub mod message;
pub mod permission;
pub mod server;

pub use channel::{
    ChannelCreated,
    ChannelDeleted,
    ChannelUpdated,
};

pub use message::{
    MessageCreated,
    MessageDeleted,
    MessageUpdated,
};
```

Et dans `src/lib.rs` :

<llm-snippet-file>src/lib.rs</llm-snippet-file>
```rust
// ... existing code ...

pub mod events;

// ... existing code ...
```

L’émission devient explicite et typée :

```rust
use crate::events::message::MessageCreated;

state.event_bus.emit(
    "message_created",
    MessageCreated {
        message_id: message.id,
        channel_id: message.channel_id,
        user_id: message.user_id,
    },
);
```

Pour les scopes, tu peux garder le système actuel du bus et simplement utiliser les données présentes dans l’événement :

```rust
use event_bus::{Scope, ScopeValue};
use crate::events::message::MessageCreated;

let event = MessageCreated {
    message_id: message.id,
    channel_id: message.channel_id,
    user_id: message.user_id,
};

state.event_bus.emit_scoped(
    "message_created",
    [
        Scope {
            key: "channel".to_string(),
            value: ScopeValue::Uuid(event.channel_id),
        },
        Scope {
            key: "user".to_string(),
            value: ScopeValue::Uuid(event.user_id),
        },
    ],
    event,
);
```

L’intérêt est que :

- le bus ne connaît aucun événement métier ;
- chaque événement possède son propre contrat ;
- les abonnés reçoivent directement un type précis ;
- les événements sont facilement réutilisables par les services, le gateway et la synchronisation des permissions ;
- tu évites une grosse enum centrale qui deviendrait rapidement difficile à maintenir.

Je mettrais uniquement dans `event_bus` les primitives génériques comme `EventBus`, `Scope` et `ScopeValue`. Les structs concrètes comme `MessageCreated`, `ChannelDeleted` ou `ServerUserUpdated` doivent rester dans le crate applicatif.

kotlin.Unit