From 0e20eb6683761362ee282e3188fccdab46b02ee4 Mon Sep 17 00:00:00 2001
From: joe <joe@jerkface.net>
Date: Thu, 27 Jul 2017 00:09:36 -0400
Subject: peer search.

---
 src/Network/BitTorrent/DHT/Search.hs | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

(limited to 'src/Network')

diff --git a/src/Network/BitTorrent/DHT/Search.hs b/src/Network/BitTorrent/DHT/Search.hs
index 8c441cb0..b263e339 100644
--- a/src/Network/BitTorrent/DHT/Search.hs
+++ b/src/Network/BitTorrent/DHT/Search.hs
@@ -21,7 +21,7 @@ import qualified Data.Set            as Set
 import System.IO
 
 import qualified Data.MinMaxPSQ   as MM
-         ;import Data.MinMaxPSQ   (MinMaxPSQ)
+         ;import Data.MinMaxPSQ   (MinMaxPSQ, MinMaxPSQ')
 import qualified Data.Wrapper.PSQ as PSQ
          ;import Data.Wrapper.PSQ (pattern (:->), Binding, PSQ, PSQKey)
 import Network.Address hiding (NodeId)
@@ -34,13 +34,13 @@ import Control.Concurrent.Lifted
 import GHC.Conc                  (labelThread)
 #endif
 
-data Search nid addr ni r = Search
+data Search nid addr tok ni r = Search
     { searchSpace        :: KademliaSpace nid ni
     , searchNodeAddress  :: ni -> addr
-    , searchQuery        :: nid -> ni -> IO ([ni], [r])
+    , searchQuery        :: nid -> ni -> IO (Maybe ([ni], [r], tok))
     }
 
-data SearchState nid addr ni r = SearchState
+data SearchState nid addr tok ni r = SearchState
     {-
     { searchParams :: Search nid addr ni r
 
@@ -60,7 +60,7 @@ data SearchState nid addr ni r = SearchState
       -- | Nodes scheduled to be queried.
     , searchQueued       :: TVar (MinMaxPSQ ni nid)
       -- | The nearest K nodes that issued a reply.
-    , searchInformant    :: TVar (MinMaxPSQ ni nid)
+    , searchInformant    :: TVar (MinMaxPSQ' ni nid tok)
       -- | This tracks already-queried addresses so we avoid bothering them
       -- again. XXX: We could probably keep only the pending queries in this
       -- set.  It also can be a bounded 'MinMaxPSQ', although searchAlpha
@@ -79,10 +79,10 @@ newSearch :: ( Ord addr
              -> (r -> STM Bool)        -- receives search results.
              -> nid                    -- target of search
              -}
-             Search nid addr ni r
+             Search nid addr tok ni r
              -> nid
              -> [ni]                   -- Initial nodes to query.
-             -> IO (SearchState nid addr ni r)
+             -> IO (SearchState nid addr tok ni r)
 newSearch (Search space nAddr qry) target ns = atomically $ do
     c <- newTVar 0
     q <- newTVar $ MM.fromList
@@ -99,25 +99,31 @@ searchAlpha = 8
 searchK :: Int
 searchK = 8
 
-sendQuery :: forall addr nid ni r.
+sendQuery :: forall addr nid tok ni r.
             ( Ord addr
             , Ord r
             , PSQKey nid
             , PSQKey ni
             , Show nid
             ) =>
-            Search nid addr ni r
+            Search nid addr tok ni r
             -> nid
             -> (r -> STM Bool)
-            -> SearchState nid addr ni r
+            -> SearchState nid addr tok 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 ([],[]))
+    -- TODO: Should we really be catching ThreadKilled ?
+    reply <- handle (\(SomeException e) -> return Nothing)
                       (searchQuery searchTarget ni)
+    -- (ns,rs)
+    let tok = error "TODO: token"
     atomically $ do
         modifyTVar searchPendingCount pred
+        maybe (return ()) go reply
+ where
+    go (ns,rs,tok) = do
         vs <- readTVar searchVisited
         -- We only queue a node if it is not yet visited
         let insertFoundNode :: ni
@@ -130,7 +136,7 @@ sendQuery Search{..} searchTarget searchResult sch@SearchState{..} (ni :-> d) =
                                                      $ kademliaLocation searchSpace n )
                                                    q
         modifyTVar searchQueued    $ \q -> foldr insertFoundNode q ns
-        modifyTVar searchInformant $ MM.insertTake searchK ni d
+        modifyTVar searchInformant $ MM.insertTake' searchK ni tok d
         flip fix rs $ \loop -> \case
             r:rs' -> do
                 wanting <- searchResult r
@@ -142,7 +148,7 @@ sendQuery Search{..} searchTarget searchResult sch@SearchState{..} (ni :-> d) =
 searchIsFinished :: ( Ord addr
                     , PSQKey nid
                     , PSQKey ni
-                    ) => SearchState nid addr ni r -> STM Bool
+                    ) => SearchState nid addr tok ni r -> STM Bool
 searchIsFinished SearchState{ ..} = do
     q <- readTVar searchQueued
     cnt <- readTVar searchPendingCount
@@ -153,7 +159,7 @@ searchIsFinished SearchState{ ..} = do
                        && ( PSQ.prio (fromJust $ MM.findMax informants)
                             <= PSQ.prio (fromJust $ MM.findMin q))))
 
-searchCancel :: SearchState nid addr ni r -> STM ()
+searchCancel :: SearchState nid addr tok ni r -> STM ()
 searchCancel SearchState{..} = do
     writeTVar searchPendingCount 0
     writeTVar searchQueued MM.empty
@@ -164,7 +170,7 @@ search ::
     , PSQKey nid
     , PSQKey ni
     , Show nid
-    ) => Search nid addr ni r -> R.BucketList ni -> nid -> (r -> STM Bool) -> IO (SearchState nid addr ni r)
+    ) => Search nid addr tok ni r -> R.BucketList ni -> nid -> (r -> STM Bool) -> IO (SearchState nid addr tok ni r)
 search sch@Search{..} buckets target result = do
     let ns = R.kclosest searchSpace searchK target buckets
     st <- newSearch sch target ns
-- 
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