From 8d8c1fba62197b71880dd25322e1e118694b7d50 Mon Sep 17 00:00:00 2001
From: Justin Li <jli.justinli@gmail.com>
Date: Tue, 22 Jul 2014 01:59:05 -0400
Subject: [PATCH] Don't write nil compact peer lists

---
 http/writer.go | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/http/writer.go b/http/writer.go
index c83fa48..3d16b61 100644
--- a/http/writer.go
+++ b/http/writer.go
@@ -35,13 +35,15 @@ func (w *Writer) WriteAnnounce(res *models.AnnounceResponse) error {
 		"min interval": res.MinInterval,
 	}
 
-	if res.IPv4Peers != nil || res.IPv6Peers != nil {
-		if res.Compact {
+	if res.Compact {
+		if res.IPv4Peers != nil {
 			dict["peers"] = compactPeers(false, res.IPv4Peers)
-			dict["peers6"] = compactPeers(true, res.IPv6Peers)
-		} else {
-			dict["peers"] = peersList(res.IPv6Peers, res.IPv4Peers)
 		}
+		if res.IPv6Peers != nil {
+			dict["peers6"] = compactPeers(true, res.IPv6Peers)
+		}
+	} else if res.IPv4Peers != nil || res.IPv6Peers != nil {
+		dict["peers"] = peersList(res.IPv6Peers, res.IPv4Peers)
 	}
 
 	bencoder := bencode.NewEncoder(w)