From 4060c2c717eeac95dd16f9222184d6b4e998cb7f Mon Sep 17 00:00:00 2001
From: joe <joe@jerkface.net>
Date: Tue, 25 Jul 2017 06:17:46 -0400
Subject: Fixes to IPv4 bootstrap.

---
 src/Network/BitTorrent/DHT/Search.hs | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

(limited to 'src/Network/BitTorrent')

diff --git a/src/Network/BitTorrent/DHT/Search.hs b/src/Network/BitTorrent/DHT/Search.hs
index a9efba89..8c441cb0 100644
--- a/src/Network/BitTorrent/DHT/Search.hs
+++ b/src/Network/BitTorrent/DHT/Search.hs
@@ -6,7 +6,6 @@
 {-# LANGUAGE LambdaCase #-}
 module Network.BitTorrent.DHT.Search where
 
-import Control.Concurrent
 import Control.Concurrent.Async.Pool
 import Control.Concurrent.STM
 import Control.Exception
@@ -28,11 +27,17 @@ import qualified Data.Wrapper.PSQ as PSQ
 import Network.Address hiding (NodeId)
 import Network.DatagramServer.Types
 import Network.DHT.Routing as R
+#ifdef THREAD_DEBUG
+import Control.Concurrent.Lifted.Instrument
+#else
+import Control.Concurrent.Lifted
+import GHC.Conc                  (labelThread)
+#endif
 
 data Search nid addr ni r = Search
     { searchSpace        :: KademliaSpace nid ni
     , searchNodeAddress  :: ni -> addr
-    , searchQuery        :: ni -> IO ([ni], [r])
+    , searchQuery        :: nid -> ni -> IO ([ni], [r])
     }
 
 data SearchState nid addr ni r = SearchState
@@ -89,7 +94,7 @@ newSearch (Search space nAddr qry) target ns = atomically $ do
            ( SearchState c q i v )
 
 searchAlpha :: Int
-searchAlpha = 3
+searchAlpha = 8
 
 searchK :: Int
 searchK = 8
@@ -99,6 +104,7 @@ sendQuery :: forall addr nid ni r.
             , Ord r
             , PSQKey nid
             , PSQKey ni
+            , Show nid
             ) =>
             Search nid addr ni r
             -> nid
@@ -107,8 +113,9 @@ sendQuery :: forall addr nid ni r.
             -> Binding ni nid
             -> IO ()
 sendQuery Search{..} searchTarget searchResult sch@SearchState{..} (ni :-> d) = do
+    myThreadId >>= flip labelThread ("searchQuery." ++ show searchTarget)
     (ns,rs) <- handle (\(SomeException e) -> return ([],[]))
-                      (searchQuery ni)
+                      (searchQuery searchTarget ni)
     atomically $ do
         modifyTVar searchPendingCount pred
         vs <- readTVar searchVisited
@@ -156,11 +163,17 @@ search ::
     , Ord addr
     , PSQKey nid
     , PSQKey ni
-    ) => Search nid addr ni r -> R.BucketList ni -> nid -> (r -> STM Bool) -> IO ()
-search sch@Search{..} buckets target result = withTaskGroup searchAlpha $ \g -> do
+    , Show nid
+    ) => Search nid addr ni r -> R.BucketList ni -> nid -> (r -> STM Bool) -> IO (SearchState nid addr ni r)
+search sch@Search{..} buckets target result = do
     let ns = R.kclosest searchSpace searchK target buckets
-    s@SearchState{..} <- newSearch sch target ns
-    fix $ \again -> do
+    st <- newSearch sch target ns
+    fork $ go st
+    return st
+ where
+  go s@SearchState{..} = do
+    myThreadId >>= flip labelThread ("search."++show target)
+    withTaskGroup searchAlpha $ \g -> fix $ \again -> do
         join $ atomically $ do
             cnt <- readTVar $ searchPendingCount
             informants <- readTVar searchInformant
@@ -170,9 +183,11 @@ search sch@Search{..} buckets target result = withTaskGroup searchAlpha $ \g ->
                   | -- If there's fewer than /k/ informants and there's any
                     -- node we haven't yet got a response from.
                     (MM.size informants < searchK) && (cnt > 0 || not (MM.null q))
+                    -- Or there's no informants yet at all.
+                    || MM.null informants
                     -- Or if the closest scheduled node is nearer than the
                     -- nearest /k/ informants.
-                    || (PSQ.prio (fromJust $ MM.findMax informants) > d)
+                    || (d < PSQ.prio (fromJust $ MM.findMax informants))
                   -> -- Then the search continues, send a query.
                      do writeTVar searchQueued q
                         modifyTVar searchVisited $ Set.insert (searchNodeAddress ni)
-- 
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