Initial code upload

src/lavalink_handler.rs

@@ -0,0 +1,85 @@
+// src/lavalink_handler.rs
+
+use serenity::http::Http; // Import Http for sending messages
+use lavalink_rs::gateway::{NodeEvent, LavalinkEventHandler as LavalinkEventHandlerRs};
+use tracing::{error, info, instrument};
+use async_trait::async_trait; // Needed to implement async trait methods
+use std::sync::Arc; // Needed for Arc<Http>
+
+
+// --- lavalink-rs Event Handler ---
+// This handler receives events directly from the connected Lavalink server.
+// It allows reacting to playback events like track start/end.
+pub struct MyLavalinkEventHandlerRs {
+  pub http: Arc<Http>, // Hold the Http client to send messages to Discord
+  // Add state if needed, e.g., channel IDs for announcements per guild.
+}
+
+#[async_trait]
+impl LavalinkEventHandlerRs for MyLavalinkEventHandlerRs {
+  // The main handler function for all Lavalink NodeEvents.
+  #[instrument(skip(self))] // Adds tracing to the handler
+  async fn handle(&self, event: NodeEvent) {
+    // You can uncomment this for verbose logging of all events:
+    // info!("Received LavaLink event: {:?}", event);
+
+    match event {
+      // Handle specific event types
+      NodeEvent::TrackStart { guild_id, track, .. } => {
+        info!(
+          "Track started on guild {}: {}",
+          guild_id,
+          track.info.title
+        );
+        // Example: send a message announcing the track.
+        // This requires knowing which channel to send it to, often
+        // stored per guild in the BotState's announcement_channels.
+        // Accessing BotState would require passing it here or using a global static.
+        // let channel_id = { /* logic to get channel_id from guild_id using self.http or shared state */ };
+        // if let Some(channel_id) = channel_id {
+        //     if let Err(e) = ChannelId(channel_id).say(&self.http,
+        //         format!("Now playing: **{}** by **{}**", track.info.title, track.info.author)
+        //     ).await {
+        //         error!("Failed to send track start message: {}", e);
+        //     }
+        // }
+      }
+      NodeEvent::TrackEnd { guild_id, track, reason, .. } => {
+        info!(
+          "Track ended on guild {}: {}, reason: {:?}",
+          guild_id,
+          track.info.title,
+          reason
+        );
+        // Logic for track end, e.g., cleaning up state if not using Lavalink queues
+      }
+      NodeEvent::TrackException { guild_id, track, error, .. } => {
+        error!(
+          "Track exception on guild {}: {}, error: {}",
+          guild_id,
+          track.info.title,
+          error
+        );
+        // Notify the channel about the exception
+      }
+      NodeEvent::TrackStuck { guild_id, track, threshold_ms, .. } => {
+        error!(
+           "Track stuck on guild {}: {}, threshold: {}ms",
+           guild_id,
+           track.info.title,
+           threshold_ms
+         );
+        // Notify the channel about the stuck track
+      }
+      NodeEvent::WebSocketOpen { node, .. } => {
+        info!("Lavalink WebSocket opened: {}", node);
+      }
+      NodeEvent::WebSocketClosed { node, code, reason, .. } => {
+        error!("Lavalink WebSocket closed: {}, Code: {:?}, Reason: {}", node, code, reason);
+      }
+      // Ignore these common events to avoid log spam
+      NodeEvent::Ready { .. } | NodeEvent::Stats { .. } => { /* Ignore */ }
+      NodeEvent::PlayerUpdate { .. } => { /* Ignore */ }
+    }
+  }
+}