Overflow mode when server exceeds Discord's ratelimiting. Will compact many messages into one embed with timestamps

discord/bridge.go

@@ -22,6 +22,9 @@ import (
 const (
 	MaxAttachments              = 4
 	ProcessedCacheSize          = 250
+	OverflowThreshold           = 10
+	OverflowRecoveryThreshold   = 5
+	OverflowBatchSize           = 15
 	MappingCacheSize            = 1000
 	MappingMaxAge               = 1 * time.Hour
 	MappingCleanupInterval      = 5 * time.Minute
@@ -73,8 +76,10 @@ type Bridge struct {
 	outageMessagesMu    sync.Mutex
 	outageStart         time.Time
 
-	stopCh chan struct{}
-	wg     sync.WaitGroup
+	stopCh     chan struct{}
+	wg         sync.WaitGroup
+	msgQueue   chan map[string]interface{}
+	overflow   bool
 }
 
 func NewBridge(cfg *config.Config, sneedClient *sneed.Client) (*Bridge, error) {
@@ -98,10 +103,11 @@ func NewBridge(cfg *config.Config, sneedClient *sneed.Client) (*Bridge, error) {
 		queuedOutbound: make([]QueuedMessage, 0),
 		outageNotices:  make([]*discordgo.Message, 0),
 		stopCh:         make(chan struct{}),
+		msgQueue:       make(chan map[string]interface{}, 500),
 	}
 
 	// hook Sneed client callbacks
-	sneedClient.OnMessage = b.onSneedMessage
+	sneedClient.OnMessage = b.enqueueSneedMessage
 	sneedClient.OnEdit = b.handleSneedEdit
 	sneedClient.OnDelete = b.handleSneedDelete
 	sneedClient.OnConnect = b.onSneedConnect
@@ -124,8 +130,10 @@ func (b *Bridge) Start() error {
 	if err := b.session.Open(); err != nil {
 		return err
 	}
-	b.wg.Add(1)
+	b.wg.Add(3)
 	go b.cleanupLoop()
+	go b.messageWorker()
+	go b.messageWorker()
 	return nil
 }
 
@@ -315,6 +323,91 @@ func (b *Bridge) onDiscordMessageDelete(s *discordgo.Session, m *discordgo.Messa
 	b.sneed.Send(fmt.Sprintf("/delete %s", sneedUUID))
 }
 
+func (b *Bridge) messageWorker() {
+	defer b.wg.Done()
+	for {
+		select {
+		case <-b.stopCh:
+			return
+		case msg, ok := <-b.msgQueue:
+			if !ok {
+				return
+			}
+			depth := len(b.msgQueue)
+			if !b.overflow && depth >= OverflowThreshold {
+				b.overflow = true
+				log.Printf("⚠️ Message queue overflow (%d pending), switching to batch mode", depth)
+			} else if b.overflow && depth <= OverflowRecoveryThreshold {
+				b.overflow = false
+				log.Printf("✅ Message queue recovered (%d pending), switching to normal mode", depth)
+			}
+			if b.overflow {
+				batch := []map[string]interface{}{msg}
+				for len(batch) < OverflowBatchSize {
+					select {
+					case next, ok := <-b.msgQueue:
+						if !ok {
+							break
+						}
+						batch = append(batch, next)
+					default:
+						goto flushBatch
+					}
+				}
+			flushBatch:
+				b.sendOverflowBatch(batch)
+			} else {
+				b.onSneedMessage(msg)
+			}
+		}
+	}
+}
+
+func (b *Bridge) sendOverflowBatch(batch []map[string]interface{}) {
+	if len(batch) == 0 {
+		return
+	}
+
+	var description strings.Builder
+	for _, msg := range batch {
+		username, _ := msg["username"].(string)
+		rawContent, _ := msg["content"].(string)
+		content := utils.BBCodeToMarkdown(rawContent)
+		content = sneed.ReplaceBridgeMention(content, b.cfg.BridgeUsername, b.cfg.DiscordPingUserID)
+
+		var ts string
+		if raw, ok := msg["raw"].(sneed.SneedMessage); ok && raw.MessageDate > 0 {
+			ts = time.Unix(int64(raw.MessageDate), 0).Format("3:04:05 PM")
+		}
+
+		description.WriteString(fmt.Sprintf("**%s** %s\n%s\n\n", username, ts, content))
+	}
+
+	webhookID, webhookToken := parseWebhookURL(b.cfg.DiscordWebhookURL)
+	embed := &discordgo.MessageEmbed{
+		Title:       "overflow mode",
+		Description: strings.TrimSpace(description.String()),
+		Color:       OutageEmbedColorActive,
+	}
+	params := &discordgo.WebhookParams{
+		Embeds: []*discordgo.MessageEmbed{embed},
+	}
+	_, err := b.session.WebhookExecute(webhookID, webhookToken, false, params)
+	if err != nil {
+		log.Printf("❌ Failed to send overflow batch: %v", err)
+		return
+	}
+	log.Printf("📦 Sent overflow batch of %d messages", len(batch))
+}
+
+func (b *Bridge) enqueueSneedMessage(msg map[string]interface{}) {
+	select {
+	case b.msgQueue <- msg:
+	default:
+		log.Printf("⚠️ Message queue full, dropping message from %s", msg["username"])
+	}
+}
+
 func (b *Bridge) onSneedMessage(msg map[string]interface{}) {
 	username, _ := msg["username"].(string)
 	rawContent, _ := msg["content"].(string)