1 files changed, 18 insertions, 0 deletions

diff --git a/src/Network/DatagramServer/Mainline.hs b/src/Network/DatagramServer/Mainline.hs
index 7f97739c..dd3c8bcd 100644
--- a/src/Network/DatagramServer/Mainline.hs
+++ b/src/Network/DatagramServer/Mainline.hs
@@ -68,6 +68,7 @@ import qualified Data.ByteString.Char8 as Char8
 import qualified Data.ByteString.Lazy  as L
 import Data.Default
 import Data.LargeWord
+import Data.Monoid
 import qualified Data.Serialize as S
 import Data.Serialize (Serialize, get, put, remaining, getBytes, putByteString)
 import Data.String
@@ -314,3 +315,20 @@ instance WireFormat BValue KMessageOf where
 
     encodeHeaders _ kmsg = L.toStrict $ BE.encode kmsg
     encodePayload msg = fmap BE.toBEncode msg
+
+-- | KRPC 'compact list' compatible encoding: contact information for
+-- nodes is encoded as a 26-byte string. Also known as "Compact node
+-- info" the 20-byte Node ID in network byte order has the compact
+-- IP-address/port info concatenated to the end.
+instance Serialize a => Serialize (NodeInfo KMessageOf a ()) where
+  get = (\a b -> NodeInfo a b ()) <$> get <*> get
+  put NodeInfo {..} = put nodeId >> put nodeAddr
+
+instance Pretty ip => Pretty (NodeInfo KMessageOf ip ()) where
+  pPrint NodeInfo {..} = pPrint nodeId <> "@(" <> pPrint nodeAddr <> ")"
+
+instance Pretty ip => Pretty [NodeInfo KMessageOf ip ()] where
+  pPrint = PP.vcat . PP.punctuate "," . map pPrint
+
+
+