Start implementing the chat widget for the dashboard

pkg/chatmessagesstorage/sort_and_deduplicate.go

@@ -0,0 +1,56 @@
+package chatmessagesstorage
+
+import (
+	"context"
+	"sort"
+
+	"github.com/facebookincubator/go-belt/tool/logger"
+	"github.com/xaionaro-go/streamctl/pkg/streamd/api"
+)
+
+func msgLess(ctx context.Context, a *api.ChatMessage, b *api.ChatMessage) bool {
+	if a.CreatedAt.Before(b.CreatedAt) {
+		return true
+	}
+	if a.Platform < b.Platform {
+		return true
+	}
+	if a.Username < b.Username {
+		return true
+	}
+	if a.MessageID < b.MessageID {
+		return true
+	}
+	if a.Message < b.Message {
+		return true
+	}
+	if a != b {
+		logger.Errorf(ctx, "msgs A and B look equal, but are not: A:%#+v B:%#+v", a, b)
+	}
+	return false
+}
+
+func (s *ChatMessagesStorage) sortAndDeduplicateAndTruncate(ctx context.Context) {
+	if len(s.Messages) == 0 {
+		return
+	}
+
+	sort.Slice(s.Messages, func(i, j int) bool {
+		return msgLess(ctx, &s.Messages[i], &s.Messages[j])
+	})
+	s.IsSorted = true
+
+	dedup := make([]api.ChatMessage, 0, len(s.Messages))
+	dedup = append(dedup, s.Messages[0])
+	for _, msg := range s.Messages[1:] {
+		if msg == dedup[len(dedup)-1] {
+			continue
+		}
+		dedup = append(dedup, msg)
+	}
+
+	s.Messages = dedup
+	if len(s.Messages) > MaxMessages {
+		s.Messages = s.Messages[len(s.Messages)-MaxMessages:]
+	}
+}