From 7d0a9f4e021dd15463659a115610df6d60f973a0 Mon Sep 17 00:00:00 2001
From: joe <joe@jerkface.net>
Date: Thu, 27 Jul 2017 03:40:27 -0400
Subject: More verbose reporting of parse errors.

---
 Mainline.hs | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/Mainline.hs b/Mainline.hs
index 921bea0f..93393c40 100644
--- a/Mainline.hs
+++ b/Mainline.hs
@@ -389,12 +389,21 @@ encodeAny tid key val aux = toDict $
         .: "y" .=! key
         .: endDict
 
+showParseError bs addr err = L8.unpack $ L8.unlines es
+ where
+    es = map (L8.append prefix) (L8.pack err : L8.lines pp)
+
+    prefix = L8.pack (show addr) <> " --> "
+
+    pp = either L8.pack showBEncode $ BE.decode bs
+
 parsePacket :: ByteString -> SockAddr -> Either String (Message BValue, NodeInfo)
-parsePacket bs addr = do pkt <- BE.decode bs
-                         -- TODO: Error packets do not inclucde a valid msgOrigin.
-                         --       The BE.decode method is using 'zeroID' as a placeholder.
-                         ni <- nodeInfo (msgOrigin pkt) addr
-                         return (pkt, ni)
+parsePacket bs addr = left (showParseError bs addr) $ do
+    pkt <- BE.decode bs
+    -- TODO: Error packets do not inclucde a valid msgOrigin.
+    --       The BE.decode method is using 'zeroID' as a placeholder.
+    ni <- nodeInfo (msgOrigin pkt) addr
+    return (pkt, ni)
 
 encodePacket :: Message BValue -> NodeInfo -> (ByteString, SockAddr)
 encodePacket msg ni = ( toStrict $ BE.encode msg
@@ -623,8 +632,7 @@ mainlineKademlia client committee var sched
                         return $ do
                             io1 >> io2
                             hPutStrLn stderr $ unwords
-                                [ "Buckets: "
-                                , show (transitionedTo tr)
+                                [ show (transitionedTo tr)
                                 , show (transitioningNode tr)
                                 ]
                    }
-- 
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