storkit: merge 396_story_whatsapp_bot_startup_announcement_after_restart

server/src/main.rs

@@ -379,6 +379,43 @@ async fn main() -> Result<(), std::io::Error> {
     let whatsapp_ctx_for_shutdown: Option<Arc<chat::transport::whatsapp::WhatsAppWebhookContext>> =
         whatsapp_ctx.clone();
 
+    // ── Startup announcements (WhatsApp & Slack) ──────────────────────────
+    //
+    // Send "{bot_name} is online." to all known contacts so users know the bot
+    // is ready.  This mirrors the Matrix bot's startup announcement and fires
+    // on every fresh process start — including after a rebuild/re-exec.
+    //
+    // • WhatsApp: send to all phone numbers present in persisted history.
+    // • Slack: send to all configured channel IDs (channel_ids from bot.toml).
+    // • Matrix: handled by spawn_bot() below; no action needed here.
+    if let Some(ref ctx) = whatsapp_ctx {
+        let transport = Arc::clone(&ctx.transport);
+        let bot_name = ctx.bot_name.clone();
+        let history = Arc::clone(&ctx.history);
+        tokio::spawn(async move {
+            let senders: Vec<String> = history.lock().await.keys().cloned().collect();
+            if senders.is_empty() {
+                return;
+            }
+            let notifier =
+                crate::rebuild::BotShutdownNotifier::new(transport, senders, bot_name);
+            notifier.notify_startup().await;
+        });
+    }
+    if let Some(ref ctx) = slack_ctx {
+        let transport = Arc::clone(&ctx.transport) as Arc<dyn crate::chat::ChatTransport>;
+        let bot_name = ctx.bot_name.clone();
+        let channels: Vec<String> = ctx.channel_ids.iter().cloned().collect();
+        tokio::spawn(async move {
+            if channels.is_empty() {
+                return;
+            }
+            let notifier =
+                crate::rebuild::BotShutdownNotifier::new(transport, channels, bot_name);
+            notifier.notify_startup().await;
+        });
+    }
+
     // Watch channel: signals the Matrix bot task to send a shutdown announcement.
     // `None` initial value means "server is running".
     let (matrix_shutdown_tx, matrix_shutdown_rx) =