init

frontend/src/stores/emoji.ts

@@ -1,5 +1,6 @@
 import {defineStore} from "pinia";
 import {useApi} from "@/composables/useApi.ts";
+import {onGatewayEvent} from "@/plugins/events.ts";
 
 export interface Emoji {
   id: string;
@@ -65,3 +66,22 @@ export const useEmojiStore = defineStore("emoji", {
     },
   },
 });
+
+onGatewayEvent("Emoji", (payload) => {
+  const store = useEmojiStore();
+  const emoji = payload.content as Emoji;
+  if (!emoji?.id) return;
+
+  // The store is scoped to the currently displayed server. Global emojis are
+  // always relevant; server emojis are relevant only for the active server.
+  if (emoji.server_id !== null && emoji.server_id !== store.activeServerId) return;
+
+  if (payload.action === "add" || payload.action === "update") {
+    store.emojis = [
+      ...store.emojis.filter(item => item.id !== emoji.id),
+      emoji,
+    ];
+  } else if (payload.action === "remove") {
+    store.emojis = store.emojis.filter(item => item.id !== emoji.id);
+  }
+});

frontend/src/stores/server.ts

@@ -2,6 +2,7 @@ import {defineStore} from "pinia";
 import {useApi} from "@/composables/useApi.ts";
 import {useChannelStore} from "@/stores/channel.ts";
 import {useCategoryStore} from "@/stores/category.ts";
+import {onGatewayEvent} from "@/plugins/events.ts";
 
 export interface Server {
   id: string
@@ -153,3 +154,17 @@ export const useServerStore = defineStore("server", {
     }
   }
 });
+
+onGatewayEvent("Channel", (payload) => {
+  const channel = payload.content as { server_id?: string | null };
+  if (channel?.server_id) {
+    void useServerStore().fetchServerTree(channel.server_id);
+  }
+});
+
+onGatewayEvent("Category", (payload) => {
+  const category = payload.content as { server_id?: string | null };
+  if (category?.server_id) {
+    void useServerStore().fetchServerTree(category.server_id);
+  }
+});

src/core/mod.rs

@@ -5,7 +5,7 @@ use crate::database::Database;
 use crate::http::server::HttpServer;
 use crate::metrics::{AppMetrics, reporter};
 use crate::repositories::Repositories;
-use crate::routes::gateway::GatewayManager;
+use crate::routes::gateway::{GatewayManager, RealtimeRouter};
 use crate::services::Services;
 use crate::udp::server::UdpServer;
 use event_bus::EventBus;
@@ -72,8 +72,13 @@ impl App {
         services
             .realtime_registry
             .start_listening(repositories.clone(), event_bus.clone());
-        let gateway = Arc::new(GatewayManager::new(services.clone(), repositories.clone()));
-        gateway.start(event_bus.clone());
+        let gateway = Arc::new(GatewayManager::new());
+        Arc::new(RealtimeRouter::new(
+            gateway.clone(),
+            services.clone(),
+            repositories.clone(),
+        ))
+        .start(event_bus.clone());
 
         let state = AppState {
             db,

src/domain/events/channel.rs

@@ -1,20 +1,17 @@
 use crate::models::channel;
-use uuid::Uuid;
 
 #[derive(Debug, Clone)]
 pub struct ChannelCreatedEvent {
-    pub server_id: Uuid,
     pub channel: channel::Model,
 }
 
 #[derive(Debug, Clone)]
 pub struct ChannelUpdatedEvent {
-    pub server_id: Uuid,
+    pub previous: channel::Model,
     pub channel: channel::Model,
 }
 
 #[derive(Debug, Clone)]
 pub struct ChannelDeletedEvent {
-    pub server_id: Uuid,
     pub channel: channel::Model,
 }

src/domain/events/emoji.rs

@@ -0,0 +1,17 @@
+use crate::models::emoji;
+
+#[derive(Debug, Clone)]
+pub struct EmojiCreatedEvent {
+    pub emoji: emoji::Model,
+}
+
+#[derive(Debug, Clone)]
+pub struct EmojiUpdatedEvent {
+    pub previous: emoji::Model,
+    pub emoji: emoji::Model,
+}
+
+#[derive(Debug, Clone)]
+pub struct EmojiDeletedEvent {
+    pub emoji: emoji::Model,
+}

src/domain/events/mod.rs

@@ -1,3 +1,4 @@
 pub mod channel;
+pub mod emoji;
 pub mod message;
 pub mod server;

src/routes/conversation/handlers.rs

@@ -3,6 +3,7 @@ use crate::domain::dto::conversation::{
     ConversationParticipantResponse, ConversationResponse, CreateConversationRequest,
     ForkConversationRequest,
 };
+use crate::domain::events::channel::ChannelCreatedEvent;
 use crate::http::context::CurrentUser;
 use crate::http::error::HTTPError;
 use crate::models::{channel, channel_user, message, user};
@@ -107,7 +108,12 @@ async fn create_channel(state: &AppState, ids: &[Uuid]) -> Result<channel::Model
         .services
         .realtime_registry
         .set_channel_users(channel.id, ids.iter().copied());
-    state.event_bus.emit("channel_created", channel.clone());
+    state.event_bus.emit(
+        "channel_created",
+        ChannelCreatedEvent {
+            channel: channel.clone(),
+        },
+    );
     Ok(channel)
 }
 

src/routes/emoji/handlers.rs

@@ -1,3 +1,5 @@
+use crate::domain::events::emoji::{EmojiCreatedEvent, EmojiDeletedEvent, EmojiUpdatedEvent};
+use crate::services::media;
 use crate::{
     core::state::AppState,
     domain::dto::emoji::{EmojiQueryParams, UpdateEmojiRequest},
@@ -6,7 +8,6 @@ use crate::{
     routes::emoji::mapper,
     services::emoji::EmojiService,
 };
-use crate::services::media;
 use axum::{
     Json,
     body::Body,
@@ -129,8 +130,12 @@ pub async fn create(
             .ok_or_else(|| HTTPError::BadRequest("Unsupported or invalid image format".into()))?;
         let extension = media::extension_from_mime(&detected);
         mime = Some(detected);
-        let (p, h) =
-            EmojiService::save_asset(std::path::Path::new(&state.config.media.root), id, &bytes, extension)
+        let (p, h) = EmojiService::save_asset(
+            std::path::Path::new(&state.config.media.root),
+            id,
+            &bytes,
+            extension,
+        )
         .await?;
         path = Some(p);
         sha = Some(h);
@@ -150,6 +155,12 @@ pub async fn create(
         ..Default::default()
     };
     let created = state.services.emoji.create(model, name).await?;
+    state.event_bus.emit(
+        "emoji_created",
+        EmojiCreatedEvent {
+            emoji: created.clone(),
+        },
+    );
     Ok((StatusCode::CREATED, Json(mapper::response(created))))
 }
 
@@ -172,6 +183,7 @@ pub async fn update(
         .emoji
         .name_available(target_name, target_server_id, Some(id))
         .await?;
+    let previous = existing.clone();
     let mut active: emoji::ActiveModel = existing.into();
     if let Some(server_id) = payload.server_id {
         state
@@ -189,6 +201,13 @@ pub async fn update(
         active.name = Set(EmojiService::normalize_name(&name)?);
     }
     let updated = state.repositories.emoji.update(active).await?;
+    state.event_bus.emit(
+        "emoji_updated",
+        EmojiUpdatedEvent {
+            previous,
+            emoji: updated.clone(),
+        },
+    );
     Ok(Json(mapper::response(updated)))
 }
 
@@ -222,6 +241,9 @@ pub async fn delete(
             model.file_path.as_deref(),
         )
         .await;
+        state
+            .event_bus
+            .emit("emoji_deleted", EmojiDeletedEvent { emoji: model });
         Ok(StatusCode::NO_CONTENT)
     } else {
         Err(HTTPError::NotFound)

src/routes/gateway/handlers.rs

@@ -41,7 +41,7 @@ async fn handle_socket(socket: WebSocket, state: AppState, user: User) {
     let (mut sender, mut receiver) = socket.split();
     let (tx, mut rx) = mpsc::unbounded_channel::<Message>();
 
-    let mut client = GatewayClient::new(user, tx, state.event_bus.clone());
+    let mut client = GatewayClient::new(user, tx);
     client.on_connect().await;
     state.gateway.add_client(client.clone());
 

src/routes/gateway/mod.rs

@@ -1,37 +1,40 @@
+use crate::domain::events::channel::{
+    ChannelCreatedEvent, ChannelDeletedEvent, ChannelUpdatedEvent,
+};
+use crate::domain::events::emoji::{EmojiCreatedEvent, EmojiDeletedEvent, EmojiUpdatedEvent};
 use crate::domain::events::message::{
     MessageCreatedEvent, MessageDeletedEvent, MessageReactionAddedEvent,
     MessageReactionRemovedEvent, MessageUpdatedEvent,
 };
-use crate::models::user::Model as User;
+use crate::models::{category, server, server_user, user};
+use crate::repositories::Repositories;
 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_with_data,
-    message_model_to_message_response_with_reactions,
+    message_model_to_message_response_with_data, message_model_to_message_response_with_reactions,
     reaction_model_to_response,
 };
 use crate::routes::server::mapper::server_model_to_server_response;
 use crate::services::Services;
-use crate::repositories::Repositories;
 use axum::extract::ws::Message;
 use event_bus::EventBus;
 use events::GatewayEvent;
 use parking_lot::RwLock;
-use std::collections::HashMap;
+use sea_orm::{ColumnTrait, EntityTrait, QueryFilter, QuerySelect};
+use serde::Serialize;
+use std::collections::{HashMap, HashSet};
 use std::sync::Arc;
 use tokio::sync::mpsc;
-use tokio::task::JoinHandle;
 use uuid::Uuid;
 
 pub mod events;
 pub mod handlers;
 pub mod routes;
 
+/// Couche de transport WebSocket. Elle ne connaît pas les permissions.
 #[derive(Debug)]
 pub struct GatewayManager {
     pub clients: RwLock<HashMap<ConnectionKey, GatewayClient>>,
-    services: Arc<Services>,
-    repositories: Arc<Repositories>,
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -42,59 +45,119 @@ pub struct ConnectionKey {
 
 #[derive(Debug, Clone)]
 pub struct GatewayClient {
-    user: User,
+    user: crate::models::user::Model,
     connection_id: Uuid,
     pub sender: mpsc::UnboundedSender<Message>,
-    pub event_bus: Arc<EventBus>,
-    _event_handles: Vec<Arc<JoinHandle<()>>>,
 }
 
 impl GatewayManager {
-    pub fn new(services: Arc<Services>, repositories: Arc<Repositories>) -> Self {
+    pub fn new() -> Self {
         Self {
             clients: RwLock::new(HashMap::new()),
+        }
+    }
+
+    pub(crate) fn add_client(&self, client: GatewayClient) {
+        self.clients.write().insert(client.key(), client);
+    }
+
+    pub(crate) fn remove_client(&self, client: &GatewayClient) {
+        self.clients.write().remove(&client.key());
+    }
+
+    pub(crate) fn send_to_users<T: Serialize>(
+        &self,
+        users: impl IntoIterator<Item = Uuid>,
+        namespace: &'static str,
+        action: &'static str,
+        content: T,
+    ) {
+        let Ok(json) = serde_json::to_string(&GatewayEvent {
+            namespace,
+            action,
+            content,
+        }) else {
+            return;
+        };
+        let users: HashSet<_> = users.into_iter().collect();
+        for (key, client) in self.clients.read().iter() {
+            if users.contains(&key.user_id) {
+                let _ = client.sender.send(Message::Text(json.clone().into()));
+            }
+        }
+    }
+}
+
+/// Résout les audiences puis délègue l'envoi au transport WebSocket.
+pub struct RealtimeRouter {
+    gateway: Arc<GatewayManager>,
+    services: Arc<Services>,
+    repositories: Arc<Repositories>,
+}
+
+impl RealtimeRouter {
+    pub fn new(
+        gateway: Arc<GatewayManager>,
+        services: Arc<Services>,
+        repositories: Arc<Repositories>,
+    ) -> Self {
+        Self {
+            gateway,
             services,
             repositories,
         }
     }
-    /// Démarre les routeurs centraux des événements de messages.
+
     pub fn start(self: &Arc<Self>, event_bus: Arc<EventBus>) {
-        let manager = Arc::clone(self);
+        let router = Arc::clone(self);
         event_bus.on_async::<MessageCreatedEvent, _, _>("message_created", move |event| {
-            let manager = Arc::clone(&manager);
+            let router = Arc::clone(&router);
             async move {
-                let message_id = event.message.id;
-                let attachments = manager
+                let attachments = router
                     .repositories
                     .message
-                    .attachments_for_messages(&[message_id])
+                    .attachments_for_messages(&[event.message.id])
                     .await
                     .ok()
-                    .and_then(|mut items| items.remove(&message_id))
+                    .and_then(|mut items| items.remove(&event.message.id))
                     .unwrap_or_default();
-                manager.broadcast_message(
-                    event.channel_id,
+                let users = router
+                    .services
+                    .realtime_registry
+                    .users_for_channel(event.channel_id);
+                router.gateway.send_to_users(
+                    users,
+                    "Message",
                     "add",
-                    message_model_to_message_response_with_data(event.message, event.server_id, Vec::new(), attachments),
+                    message_model_to_message_response_with_data(
+                        event.message,
+                        event.server_id,
+                        Vec::new(),
+                        attachments,
+                    ),
                 );
             }
         });
 
-        let manager = Arc::clone(self);
+        let router = Arc::clone(self);
         event_bus.on_async::<MessageUpdatedEvent, _, _>("message_updated", move |event| {
-            let manager = Arc::clone(&manager);
+            let router = Arc::clone(&router);
             async move {
-                let message_id = event.message.id;
-                let reactions = manager
+                let reactions = router
                     .services
                     .message_reaction
-                    .grouped_for_messages(&[message_id])
+                    .grouped_for_messages(&[event.message.id])
                     .await
                     .ok()
-                    .and_then(|mut groups| groups.remove(&message_id))
+                    .and_then(|mut groups| groups.remove(&event.message.id))
                     .unwrap_or_default();
-                manager.broadcast_message(
-                    event.channel_id,
+                let users = router
+                    .services
+                    .realtime_registry
+                    .users_for_channel(event.channel_id);
+                router.gateway.send_to_users(
+                    users,
+                    "Message",
                     "update",
                     message_model_to_message_response_with_reactions(
                         event.message,
@@ -105,22 +168,33 @@ impl GatewayManager {
             }
         });
 
-        let manager = Arc::clone(self);
+        let router = Arc::clone(self);
         event_bus.on_async::<MessageDeletedEvent, _, _>("message_deleted", move |event| {
-            let manager = Arc::clone(&manager);
+            let router = Arc::clone(&router);
             async move {
-                manager.broadcast_message(event.channel_id, "remove", event.message.id);
+                let users = router
+                    .services
+                    .realtime_registry
+                    .users_for_channel(event.channel_id);
+                router
+                    .gateway
+                    .send_to_users(users, "Message", "remove", event.message.id);
             }
         });
 
-        let manager = Arc::clone(self);
+        let router = Arc::clone(self);
         event_bus.on_async::<MessageReactionAddedEvent, _, _>(
             "message_reaction_added",
             move |event| {
-                let manager = Arc::clone(&manager);
+                let router = Arc::clone(&router);
                 async move {
-                    manager.broadcast_reaction(
-                        event.channel_id,
+                    let users = router
+                        .services
+                        .realtime_registry
+                        .users_for_channel(event.channel_id);
+                    router.gateway.send_to_users(
+                        users,
+                        "Reaction",
                         "add",
                         reaction_model_to_response(event.reaction),
                     );
@@ -128,99 +202,248 @@ impl GatewayManager {
             },
         );
 
-        let manager = Arc::clone(self);
+        let router = Arc::clone(self);
         event_bus.on_async::<MessageReactionRemovedEvent, _, _>(
             "message_reaction_removed",
             move |event| {
-                let manager = Arc::clone(&manager);
+                let router = Arc::clone(&router);
                 async move {
-                    manager.broadcast_reaction(
-                        event.channel_id,
+                    let users = router
+                        .services
+                        .realtime_registry
+                        .users_for_channel(event.channel_id);
+                    router.gateway.send_to_users(
+                        users,
+                        "Reaction",
                         "remove",
                         reaction_model_to_response(event.reaction),
                     );
                 }
             },
         );
-    }
 
-    pub(crate) fn add_client(&self, gateway_client: GatewayClient) {
-        let key = gateway_client.key();
-        self.clients.write().insert(key, gateway_client);
-    }
-
-    pub(crate) fn remove_client(&self, gateway_client: &GatewayClient) {
-        let key = gateway_client.key();
-        self.clients.write().remove(&key);
-    }
-
-    fn broadcast_message<T: serde::Serialize>(
-        &self,
-        channel_id: Uuid,
-        action: &'static str,
-        content: T,
-    ) {
-        let event = GatewayEvent {
-            namespace: "Message",
-            action,
-            content,
-        };
-        let Ok(json) = serde_json::to_string(&event) else {
-            return;
-        };
-
-        let users = self
+        let router = Arc::clone(self);
+        event_bus.on_async::<ChannelCreatedEvent, _, _>("channel_created", move |event| {
+            let router = Arc::clone(&router);
+            async move {
+                if let Err(error) = router
                     .services
                     .realtime_registry
-            .users_for_channel(channel_id);
-        let clients = self.clients.read();
-        for (key, client) in clients.iter() {
-            if users.contains(&key.user_id) {
-                let _ = client.sender.send(Message::Text(json.clone().into()));
-            }
-        }
-    }
-
-    fn broadcast_reaction<T: serde::Serialize>(
-        &self,
-        channel_id: Uuid,
-        action: &'static str,
-        content: T,
-    ) {
-        let event = GatewayEvent {
-            namespace: "Reaction",
-            action,
-            content,
-        };
-        let Ok(json) = serde_json::to_string(&event) else {
+                    .refresh_channel(&router.repositories, event.channel.id)
+                    .await
+                {
+                    tracing::error!(channel_id = %event.channel.id, ?error, "Unable to refresh channel audience");
                     return;
-        };
-
-        let users = self
+                }
+                let users = router
                     .services
                     .realtime_registry
-            .users_for_channel(channel_id);
-        let clients = self.clients.read();
-        for (key, client) in clients.iter() {
-            if users.contains(&key.user_id) {
-                let _ = client.sender.send(Message::Text(json.clone().into()));
+                    .users_for_channel(event.channel.id);
+                router.gateway.send_to_users(
+                    users,
+                    "Channel",
+                    "add",
+                    channel_model_to_channel_response(event.channel),
+                );
             }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<ChannelUpdatedEvent, _, _>("channel_updated", move |event| {
+            let router = Arc::clone(&router);
+            async move {
+                let mut users = router
+                    .services
+                    .realtime_registry
+                    .users_for_channel(event.channel.id);
+                users.extend(
+                    router
+                        .services
+                        .realtime_registry
+                        .users_for_channel(event.previous.id),
+                );
+                router.gateway.send_to_users(
+                    users,
+                    "Channel",
+                    "update",
+                    channel_model_to_channel_response(event.channel),
+                );
+            }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<ChannelDeletedEvent, _, _>("channel_deleted", move |event| {
+            let router = Arc::clone(&router);
+            async move {
+                let users = router
+                    .services
+                    .realtime_registry
+                    .users_for_channel(event.channel.id);
+                router
+                    .gateway
+                    .send_to_users(users, "Channel", "remove", event.channel.id);
+                router
+                    .services
+                    .realtime_registry
+                    .remove_channel(event.channel.id);
+            }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<category::Model, _, _>("category_created", move |category| {
+            let router = Arc::clone(&router);
+            async move {
+                let users = router.server_users(category.server_id).await;
+                router.gateway.send_to_users(
+                    users,
+                    "Category",
+                    "add",
+                    category_model_to_category_response(category),
+                );
+            }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<category::Model, _, _>("category_updated", move |category| {
+            let router = Arc::clone(&router);
+            async move {
+                let users = router.server_users(category.server_id).await;
+                router.gateway.send_to_users(
+                    users,
+                    "Category",
+                    "update",
+                    category_model_to_category_response(category),
+                );
+            }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<category::Model, _, _>("category_deleted", move |category| {
+            let router = Arc::clone(&router);
+            async move {
+                let users = router.server_users(category.server_id).await;
+                router
+                    .gateway
+                    .send_to_users(users, "Category", "remove", category.id);
+            }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<server::Model, _, _>("server_created", move |server| {
+            let router = Arc::clone(&router);
+            async move {
+                let users = router.server_users(server.id).await;
+                router.gateway.send_to_users(
+                    users,
+                    "Server",
+                    "add",
+                    server_model_to_server_response(server),
+                );
+            }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<server::Model, _, _>("server_updated", move |server| {
+            let router = Arc::clone(&router);
+            async move {
+                let users = router.server_users(server.id).await;
+                router.gateway.send_to_users(
+                    users,
+                    "Server",
+                    "update",
+                    server_model_to_server_response(server),
+                );
+            }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<(server::Model, Vec<Uuid>), _, _>(
+            "server_deleted",
+            move |(server, users)| {
+                let router = Arc::clone(&router);
+                async move {
+                    router
+                        .gateway
+                        .send_to_users(users, "Server", "remove", server.id);
+                }
+            },
+        );
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<EmojiCreatedEvent, _, _>("emoji_created", move |event| {
+            let router = Arc::clone(&router);
+            async move {
+                let users = router.emoji_users(event.emoji.server_id).await;
+                router.gateway.send_to_users(
+                    users,
+                    "Emoji",
+                    "add",
+                    crate::routes::emoji::mapper::response(event.emoji),
+                );
+            }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<EmojiUpdatedEvent, _, _>("emoji_updated", move |event| {
+            let router = Arc::clone(&router);
+            async move {
+                let mut users = router.emoji_users(event.emoji.server_id).await;
+                users.extend(router.emoji_users(event.previous.server_id).await);
+                router.gateway.send_to_users(
+                    users,
+                    "Emoji",
+                    "update",
+                    crate::routes::emoji::mapper::response(event.emoji),
+                );
+            }
+        });
+
+        let router = Arc::clone(self);
+        event_bus.on_async::<EmojiDeletedEvent, _, _>("emoji_deleted", move |event| {
+            let router = Arc::clone(&router);
+            async move {
+                let users = router.emoji_users(event.emoji.server_id).await;
+                router.gateway.send_to_users(
+                    users,
+                    "Emoji",
+                    "remove",
+                    crate::routes::emoji::mapper::response(event.emoji),
+                );
+            }
+        });
+    }
+
+    async fn server_users(&self, server_id: Uuid) -> Vec<Uuid> {
+        server_user::Entity::find()
+            .filter(server_user::Column::ServerId.eq(server_id))
+            .select_only()
+            .column(server_user::Column::UserId)
+            .into_tuple::<Uuid>()
+            .all(&self.repositories.server.context.db)
+            .await
+            .unwrap_or_default()
+    }
+
+    async fn emoji_users(&self, server_id: Option<Uuid>) -> Vec<Uuid> {
+        match server_id {
+            Some(server_id) => self.server_users(server_id).await,
+            None => user::Entity::find()
+                .select_only()
+                .column(user::Column::Id)
+                .into_tuple::<Uuid>()
+                .all(&self.repositories.server.context.db)
+                .await
+                .unwrap_or_default(),
         }
     }
 }
 
 impl GatewayClient {
-    pub fn new(
-        user: User,
-        sender: mpsc::UnboundedSender<Message>,
-        event_bus: Arc<EventBus>,
-    ) -> Self {
+    pub fn new(user: crate::models::user::Model, sender: mpsc::UnboundedSender<Message>) -> Self {
         Self {
             user,
             connection_id: Uuid::new_v4(),
             sender,
-            event_bus,
-            _event_handles: Vec::new(),
         }
     }
 
@@ -231,113 +454,16 @@ impl GatewayClient {
         }
     }
 
-    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();
-
-        // Les messages sont routés par GatewayManager selon le channel_id.
-
-        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));
-
-        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));
-
-        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!(user_id = %self.user.id, "Client connected");
-        self.subscribe_to_events();
     }
-
     async fn on_disconnect(&mut self) {
         tracing::info!(user_id = %self.user.id, "Client disconnected");
-        self.unsubscribe_all();
     }
 
     async fn on_message(&self, message: Message) {
-        match message {
-            Message::Binary(_) => {}
-            Message::Text(content) => {
+        if let Message::Text(content) = message {
             tracing::info!(user_id = %self.user.id, "Received text message: {}", content);
         }
-            Message::Ping(_) => {}
-            Message::Pong(_) => {}
-            Message::Close(_) => {}
-        }
     }
 }

src/routes/gateway/routes.rs

@@ -1,7 +1,7 @@
 use super::handlers;
 use crate::core::AppState;
-use axum::routing::get;
 use axum::Router;
+use axum::routing::get;
 
 pub fn router() -> Router<AppState> {
     Router::new().route("/gateway", get(handlers::ws_handler))

src/services/category.rs

@@ -87,6 +87,11 @@ impl CategoryService {
 
         let txn = db.begin().await?;
 
+        let existing = category::Entity::find_by_id(id)
+            .one(&txn)
+            .await?
+            .ok_or_else(|| anyhow::anyhow!("Category not found"))?;
+
         self.service_context
             .services
             .get()
@@ -102,7 +107,7 @@ impl CategoryService {
         txn.commit().await?;
 
         if deleted {
-            event_bus.emit("category_deleted", id);
+            event_bus.emit("category_deleted", existing);
         }
 
         Ok(deleted)

src/services/channel.rs

@@ -1,4 +1,7 @@
 use crate::domain::dto::channel::{CreateChannelRequest, UpdateChannelRequest};
+use crate::domain::events::channel::{
+    ChannelCreatedEvent, ChannelDeletedEvent, ChannelUpdatedEvent,
+};
 use crate::models::server_item_order::OrderedResourceType;
 use crate::models::{channel, role};
 use crate::permissions::PermissionSet;
@@ -88,7 +91,12 @@ impl ChannelService {
             .await?;
 
         // Post-commit event emission
-        event_bus.emit("channel_created", channel.clone());
+        event_bus.emit(
+            "channel_created",
+            ChannelCreatedEvent {
+                channel: channel.clone(),
+            },
+        );
 
         Ok(channel)
     }
@@ -108,6 +116,7 @@ impl ChannelService {
             .await?
             .ok_or_else(|| anyhow::anyhow!("Channel not found"))?;
 
+        let previous = existing.clone();
         let mut active: channel::ActiveModel = existing.into();
         active.server_id = Set(payload.server_id);
         active.category_id = Set(payload.category_id);
@@ -132,7 +141,13 @@ impl ChannelService {
 
         txn.commit().await?;
 
-        event_bus.emit("channel_updated", channel.clone());
+        event_bus.emit(
+            "channel_updated",
+            ChannelUpdatedEvent {
+                previous,
+                channel: channel.clone(),
+            },
+        );
 
         Ok(channel)
     }
@@ -143,6 +158,11 @@ impl ChannelService {
 
         let txn = db.begin().await?;
 
+        let existing = channel::Entity::find_by_id(id)
+            .one(&txn)
+            .await?
+            .ok_or_else(|| anyhow::anyhow!("Channel not found"))?;
+
         self.service_context
             .services
             .get()
@@ -158,7 +178,7 @@ impl ChannelService {
         txn.commit().await?;
 
         if deleted {
-            event_bus.emit("channel_deleted", id);
+            event_bus.emit("channel_deleted", ChannelDeletedEvent { channel: existing });
         }
 
         Ok(deleted)

src/services/permission_sync.rs

@@ -1,3 +1,5 @@
+use crate::domain::events::channel::{ChannelCreatedEvent, ChannelDeletedEvent};
+use crate::models::server;
 use crate::repositories::Repositories;
 use crate::services::ServicesContext;
 use std::sync::Arc;
@@ -71,8 +73,8 @@ impl PermissionSyncService {
         event_bus.on_async_with(
             "server_created",
             repositories.clone(),
-            move |repositories, server_id: Uuid| async move {
-                Self::sync_server(repositories, server_id).await;
+            move |repositories, server: server::Model| async move {
+                Self::sync_server(repositories, server.id).await;
             },
         );
 
@@ -139,16 +141,20 @@ impl PermissionSyncService {
         event_bus.on_async_with(
             "channel_created",
             repositories.clone(),
-            move |repositories, server_id: Uuid| async move {
+            move |repositories, event: ChannelCreatedEvent| async move {
+                if let Some(server_id) = event.channel.server_id {
                     Self::sync_server(repositories, server_id).await;
+                }
             },
         );
 
         event_bus.on_async_with(
             "channel_deleted",
             repositories.clone(),
-            move |repositories, server_id: Uuid| async move {
+            move |repositories, event: ChannelDeletedEvent| async move {
+                if let Some(server_id) = event.channel.server_id {
                     Self::sync_server(repositories, server_id).await;
+                }
             },
         );
 
@@ -167,6 +173,42 @@ impl PermissionSyncService {
                 Self::sync_user(repositories, user_id, server_id).await;
             },
         );
+
+        event_bus.on_async_with(
+            "channel_user_permission_created",
+            repositories.clone(),
+            move |repositories, (channel_id, user_id, _permissions): (Uuid, Uuid, u64)| async move {
+                if let Some(channel) = repositories
+                    .channel
+                    .get_by_id(channel_id)
+                    .await
+                    .ok()
+                    .flatten()
+                {
+                    if let Some(server_id) = channel.server_id {
+                        Self::sync_user(repositories, user_id, server_id).await;
+                    }
+                }
+            },
+        );
+
+        event_bus.on_async_with(
+            "channel_user_permission_deleted",
+            repositories,
+            move |repositories, (channel_id, user_id): (Uuid, Uuid)| async move {
+                if let Some(channel) = repositories
+                    .channel
+                    .get_by_id(channel_id)
+                    .await
+                    .ok()
+                    .flatten()
+                {
+                    if let Some(server_id) = channel.server_id {
+                        Self::sync_user(repositories, user_id, server_id).await;
+                    }
+                }
+            },
+        );
     }
 
     // -------------------------------------------------------------------------

src/services/realtime_registry.rs

@@ -3,10 +3,10 @@ use crate::permissions::ChannelPermission;
 use crate::repositories::Repositories;
 use event_bus::EventBus;
 use parking_lot::RwLock;
+use sea_orm::{ColumnTrait, EntityTrait, QueryFilter};
 use std::collections::{HashMap, HashSet};
 use std::sync::Arc;
 use uuid::Uuid;
-use sea_orm::{ColumnTrait, EntityTrait, QueryFilter};
 
 /// In-memory index of the users that can receive events for each channel.
 #[derive(Debug, Default)]
@@ -16,6 +16,58 @@ pub struct RealtimeRegistry {
 }
 
 impl RealtimeRegistry {
+    /// Rebuilds one channel audience after a committed structural change.
+    pub async fn refresh_channel(
+        &self,
+        repositories: &Repositories,
+        channel_id: Uuid,
+    ) -> anyhow::Result<()> {
+        let channel = channel::Entity::find_by_id(channel_id)
+            .one(&repositories.channel.context.db)
+            .await?
+            .ok_or_else(|| anyhow::anyhow!("Channel not found"))?;
+
+        if channel.channel_type == channel::ChannelType::DM {
+            let users = channel_user::Entity::find()
+                .filter(channel_user::Column::ChannelId.eq(channel_id))
+                .all(&repositories.channel.context.db)
+                .await?
+                .into_iter()
+                .map(|member| member.user_id);
+            self.set_channel_users(channel_id, users);
+        } else {
+            let permissions = repositories.computed_permission.get_all().await?;
+            self.set_channel_users(
+                channel_id,
+                permissions.into_iter().filter_map(|permission| {
+                    (permission.scope_type == PermissionScopeType::Channel
+                        && permission.resource_id == channel_id
+                        && ChannelPermission::from_bits_retain(permission.permissions as u64)
+                            .contains(ChannelPermission::READ_CHANNEL))
+                    .then_some(permission.user_id)
+                }),
+            );
+        }
+        Ok(())
+    }
+
+    async fn refresh_user(&self, repositories: &Repositories, user_id: Uuid) -> anyhow::Result<()> {
+        let channels = repositories
+            .computed_permission
+            .get_all()
+            .await?
+            .into_iter()
+            .filter(|permission| {
+                permission.user_id == user_id
+                    && permission.scope_type == PermissionScopeType::Channel
+                    && ChannelPermission::from_bits_retain(permission.permissions as u64)
+                        .contains(ChannelPermission::READ_CHANNEL)
+            })
+            .map(|permission| permission.resource_id);
+        self.set_user_channels(user_id, channels);
+        Ok(())
+    }
+
     pub async fn initialize(&self, repositories: &Repositories) -> anyhow::Result<()> {
         let permissions = repositories.computed_permission.get_all().await?;
         let mut channel_users = HashMap::<Uuid, HashSet<Uuid>>::new();
@@ -51,8 +103,14 @@ impl RealtimeRegistry {
                 .all(&repositories.channel.context.db)
                 .await?;
             for member in members {
-                channel_users.entry(member.channel_id).or_default().insert(member.user_id);
-                user_channels.entry(member.user_id).or_default().insert(member.channel_id);
+                channel_users
+                    .entry(member.channel_id)
+                    .or_default()
+                    .insert(member.user_id);
+                user_channels
+                    .entry(member.user_id)
+                    .or_default()
+                    .insert(member.channel_id);
             }
         }
 
@@ -73,13 +131,17 @@ impl RealtimeRegistry {
         let users: HashSet<_> = users.into_iter().collect();
         let old = {
             let mut by_channel = self.channel_users.write();
-            by_channel.insert(channel_id, users.clone()).unwrap_or_default()
+            by_channel
+                .insert(channel_id, users.clone())
+                .unwrap_or_default()
         };
         let mut by_user = self.user_channels.write();
         for user_id in old.difference(&users) {
             if let Some(channels) = by_user.get_mut(user_id) {
                 channels.remove(&channel_id);
-                if channels.is_empty() { by_user.remove(user_id); }
+                if channels.is_empty() {
+                    by_user.remove(user_id);
+                }
             }
         }
         for user_id in users {
@@ -148,22 +210,37 @@ impl RealtimeRegistry {
             move |repositories, (_channel_id, user_id, _permissions): (Uuid, Uuid, u64)| {
                 let registry = Arc::clone(&registry);
                 async move {
-                    match repositories.computed_permission.get_all().await {
-                        Ok(all) => registry.set_user_channels(
-                            user_id,
-                            all.into_iter()
-                                .filter(|p| {
-                                    p.user_id == user_id
-                                        && p.scope_type == PermissionScopeType::Channel
-                                        && ChannelPermission::from_bits_retain(p.permissions as u64)
-                                            .contains(ChannelPermission::READ_CHANNEL)
-                                })
-                                .map(|p| p.resource_id),
-                        ),
-                        Err(error) => {
+                    if let Err(error) = registry.refresh_user(&repositories, user_id).await {
                         tracing::error!(%user_id, ?error, "Unable to refresh realtime registry")
                     }
                 }
+            },
+        );
+
+        let registry = Arc::clone(self);
+        event_bus.on_async_with(
+            "channel_user_permission_created",
+            repositories.clone(),
+            move |repositories, (_channel_id, user_id, _permissions): (Uuid, Uuid, u64)| {
+                let registry = Arc::clone(&registry);
+                async move {
+                    if let Err(error) = registry.refresh_user(&repositories, user_id).await {
+                        tracing::error!(%user_id, ?error, "Unable to refresh realtime registry")
+                    }
+                }
+            },
+        );
+
+        let registry = Arc::clone(self);
+        event_bus.on_async_with(
+            "channel_user_permission_deleted",
+            repositories.clone(),
+            move |repositories, (_channel_id, user_id): (Uuid, Uuid)| {
+                let registry = Arc::clone(&registry);
+                async move {
+                    if let Err(error) = registry.refresh_user(&repositories, user_id).await {
+                        tracing::error!(%user_id, ?error, "Unable to refresh realtime registry")
+                    }
                 }
             },
         );
@@ -176,18 +253,8 @@ impl RealtimeRegistry {
             move |repositories, (_server_id, user_id): (Uuid, Uuid)| {
                 let registry = Arc::clone(&registry);
                 async move {
-                    if let Ok(all) = repositories.computed_permission.get_all().await {
-                        registry.set_user_channels(
-                            user_id,
-                            all.into_iter()
-                                .filter(|p| {
-                                    p.user_id == user_id
-                                        && p.scope_type == PermissionScopeType::Channel
-                                        && ChannelPermission::from_bits_retain(p.permissions as u64)
-                                            .contains(ChannelPermission::READ_CHANNEL)
-                                })
-                                .map(|p| p.resource_id),
-                        );
+                    if let Err(error) = registry.refresh_user(&repositories, user_id).await {
+                        tracing::error!(%user_id, ?error, "Unable to refresh realtime registry")
                     }
                 }
             },
@@ -210,8 +277,22 @@ mod tests {
         registry.set_channel_users(channel_id, [first, second]);
 
         assert_eq!(registry.users_for_channel(channel_id).len(), 2);
-        assert!(registry.user_channels.read().get(&first).unwrap().contains(&channel_id));
-        assert!(registry.user_channels.read().get(&second).unwrap().contains(&channel_id));
+        assert!(
+            registry
+                .user_channels
+                .read()
+                .get(&first)
+                .unwrap()
+                .contains(&channel_id)
+        );
+        assert!(
+            registry
+                .user_channels
+                .read()
+                .get(&second)
+                .unwrap()
+                .contains(&channel_id)
+        );
 
         registry.set_channel_users(channel_id, [second]);
         assert!(!registry.user_channels.read().contains_key(&first));

src/services/server.rs

@@ -1,4 +1,4 @@
-use crate::models::{role, server};
+use crate::models::{role, server, server_user};
 use crate::repositories::Repositories;
 use crate::services::ServicesContext;
 use sea_orm::{
@@ -85,6 +85,18 @@ impl ServerService {
 
         let txn = db.begin().await?;
 
+        let existing = server::Entity::find_by_id(id)
+            .one(&txn)
+            .await?
+            .ok_or_else(|| anyhow::anyhow!("Server not found"))?;
+        let audience = server_user::Entity::find()
+            .filter(server_user::Column::ServerId.eq(id))
+            .all(&txn)
+            .await?
+            .into_iter()
+            .map(|member| member.user_id)
+            .collect::<Vec<_>>();
+
         let res = server::Entity::delete_by_id(id).exec(&txn).await?;
 
         let deleted = res.rows_affected > 0;
@@ -92,7 +104,7 @@ impl ServerService {
         txn.commit().await?;
 
         if deleted {
-            event_bus.emit("server_deleted", id);
+            event_bus.emit("server_deleted", (existing, audience));
         }
 
         Ok(deleted)

src/utils/mod.rs

@@ -13,10 +13,14 @@ pub struct ScopedGuard<'a, K: Eq + Hash + Clone> {
 
 impl<'a, K: Eq + Hash + Clone> Drop for ScopedGuard<'a, K> {
     fn drop(&mut self) {
-        // Optionnel : Nettoyage des Mutex orphelins dans la HashMap scopée
-        let mut map = self.manager.scopes.blocking_lock();
-        if let Some(weak) = map.get(&self.key) {
-            if weak.strong_count() == 0 {
+        // `Drop` peut être exécuté sur une tâche Tokio. `blocking_lock` y
+        // panique ; le nettoyage est opportuniste et sera retenté au prochain
+        // `lock_scope` si le mutex de la table est momentanément occupé.
+        if let Ok(mut map) = self.manager.scopes.try_lock() {
+            if map
+                .get(&self.key)
+                .is_some_and(|weak| weak.strong_count() <= 1)
+            {
                 map.remove(&self.key);
             }
         }