refactor(core): migrate session_manager, email, rpc from slog to tracing

- session_manager/manager.rs: remove slog::Logger field, update new()
  and with_config() to remove log parameter
- email/lib.rs: remove slog::Logger from AppEmail::init()
- rpc/admin/server.rs: remove slog::Logger from serve() and spawn(),
  replace with tracing::info!/error!

libs/email/Cargo.toml

@@ -21,6 +21,6 @@ tokio = { workspace = true, features = ["rt-multi-thread", "rt", "sync", "macros
 serde = { workspace = true, features = ["derive"] }
 anyhow = { workspace = true }
 regex = { workspace = true }
-slog = { workspace = true }
+tracing = { workspace = true }
 [lints]
 workspace = true

libs/email/lib.rs

@@ -24,7 +24,7 @@ pub struct AppEmail {
 }
 
 impl AppEmail {
-    pub async fn init(cfg: &AppConfig, logs: slog::Logger) -> anyhow::Result<Self> {
+    pub async fn init(cfg: &AppConfig) -> anyhow::Result<Self> {
         let smtp_host = cfg.smtp_host()?;
         let smtp_port = cfg.smtp_port()?;
         let smtp_username = cfg.smtp_username()?;
@@ -75,7 +75,7 @@ impl AppEmail {
                 {
                     Ok(e) => e,
                     Err(_) => {
-                        slog::warn!(logs, "Email build error: to={}", msg.to);
+                        tracing::warn!(to = %msg.to, "Email build error");
                         continue;
                     }
                 };
@@ -92,24 +92,19 @@ impl AppEmail {
                         }
                         Ok(Err(e)) => {
                             if i == 2 {
-                                slog::error!(
-                                    logs,
-                                    "Email send failed after retries: to={}, error={}",
-                                    msg.to,
-                                    e
-                                );
+                                tracing::error!(to = %msg.to, error = %e, "Email send failed after retries");
                             }
                             tokio::time::sleep(Duration::from_secs((1 << i) as u64)).await;
                         }
                         Err(e) => {
-                            slog::error!(logs, "Email spawn error: to={}, err={}", msg.to, e);
+                            tracing::error!(to = %msg.to, error = %e, "Email spawn error");
                             break;
                         }
                     }
                 }
 
                 if !success {
-                    slog::warn!(logs, "Email send permanently failed: to={}", msg.to);
+                    tracing::warn!(to = %msg.to, "Email send permanently failed");
                 }
             }
         });

libs/rpc/admin/server.rs

@@ -1,7 +1,6 @@
 //! Tonic gRPC server implementation for SessionAdmin service.
 
 use session_manager::SessionManager;
-use slog::Logger;
 use std::net::SocketAddr;
 use tokio::sync::broadcast;
 use tonic::{transport::Server, Request, Response, Status};
@@ -181,13 +180,12 @@ pub const DEFAULT_GRPC_PORT: u16 = 9090;
 pub async fn serve(
     addr: SocketAddr,
     session_manager: SessionManager,
-    log: Logger,
 ) -> anyhow::Result<()> {
     let service = SessionAdminService::new(session_manager);
     let incoming = tonic::transport::server::TcpIncoming::bind(addr)
         .map_err(|e| anyhow::anyhow!("failed to bind TcpIncoming: {}", e))?;
 
-    slog::info!(log, "Admin gRPC server listening on {}", addr);
+    tracing::info!(addr = %addr, "Admin gRPC server listening");
 
     Server::builder()
         .add_service(SessionAdminServer::new(service))
@@ -201,13 +199,12 @@ pub async fn serve(
 pub fn spawn(
     addr: SocketAddr,
     session_manager: SessionManager,
-    log: Logger,
     mut shutdown_rx: broadcast::Receiver<()>,
 ) -> tokio::task::JoinHandle<()> {
     tokio::spawn(async move {
-        let result = serve(addr, session_manager, log).await;
+        let result = serve(addr, session_manager).await;
         if let Err(e) = result {
-            eprintln!("Admin gRPC server error: {}", e);
+            tracing::error!(error = %e, "Admin gRPC server error");
         }
 
         let _ = shutdown_rx.recv().await;

libs/session_manager/src/manager.rs

@@ -3,7 +3,6 @@ use uuid::Uuid;
 
 use crate::storage::{SessionStorage, SessionStorageError};
 use crate::types::{OnlineStatus, SessionInfo, UserSession};
-use slog::info;
 
 #[derive(Debug, Clone)]
 pub struct SessionManagerConfig {
@@ -25,27 +24,23 @@ pub struct SessionManager {
     storage: SessionStorage,
     #[allow(dead_code)]
     config: SessionManagerConfig,
-    logger: slog::Logger,
 }
 
 impl SessionManager {
-    pub fn new(storage: SessionStorage, logger: slog::Logger) -> Self {
+    pub fn new(storage: SessionStorage) -> Self {
         Self {
             storage,
             config: SessionManagerConfig::default(),
-            logger,
         }
     }
 
     pub fn with_config(
         storage: SessionStorage,
         config: SessionManagerConfig,
-        logger: slog::Logger,
     ) -> Self {
         Self {
             storage,
             config,
-            logger,
         }
     }
 
@@ -69,10 +64,11 @@ impl SessionManager {
         };
 
         self.storage.save_session(&session).await?;
-        info!(self.logger, "session_registered";
-            "session_id" => %session.session_id,
-            "user_id" => %session.user_id,
-            "workspace_id" => %session.workspace_id
+        tracing::info!(
+            session_id = %session.session_id,
+            user_id = %session.user_id,
+            workspace_id = %session.workspace_id,
+            "session_registered"
         );
         Ok(session)
     }
@@ -85,7 +81,7 @@ impl SessionManager {
     /// Remove a single session (logout from one device/tab).
     pub async fn remove_session(&self, session_id: &Uuid) -> Result<(), SessionStorageError> {
         self.storage.delete_session(session_id).await?;
-        info!(self.logger, "session_removed"; "session_id" => %session_id);
+        tracing::info!(session_id = %session_id, "session_removed");
         Ok(())
     }
 
@@ -100,10 +96,11 @@ impl SessionManager {
             .delete_user_workspace_sessions(user_id, workspace_id)
             .await?;
         let count = deleted.len();
-        info!(self.logger, "user_kicked_from_workspace";
-            "user_id" => %user_id,
-            "workspace_id" => %workspace_id,
-            "sessions_removed" => count
+        tracing::info!(
+            user_id = %user_id,
+            workspace_id = %workspace_id,
+            sessions_removed = count,
+            "user_kicked_from_workspace"
         );
         Ok(count)
     }
@@ -112,7 +109,7 @@ impl SessionManager {
     pub async fn kick_user(&self, user_id: &Uuid) -> Result<usize, SessionStorageError> {
         let deleted = self.storage.delete_user_sessions(user_id).await?;
         let count = deleted.len();
-        info!(self.logger, "user_kicked"; "user_id" => %user_id, "sessions_removed" => count);
+        tracing::info!(user_id = %user_id, sessions_removed = count, "user_kicked");
         Ok(count)
     }