From cef3eccbe44e4b4d125f94ef87444b5291077288 Mon Sep 17 00:00:00 2001
From: Sam T <pxqr.sta@gmail.com>
Date: Mon, 8 Jul 2013 01:42:45 +0400
Subject: ~ Flush pending queue.

Otherwise we get space leak.
---
 src/Network/BitTorrent/Exchange.hs | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/src/Network/BitTorrent/Exchange.hs b/src/Network/BitTorrent/Exchange.hs
index 3f3346d2..ca82181c 100644
--- a/src/Network/BitTorrent/Exchange.hs
+++ b/src/Network/BitTorrent/Exchange.hs
@@ -121,12 +121,12 @@ yieldMessage :: Message -> P2P ()
 yieldMessage msg =  P2P $ ReaderT $ const $ {-# SCC yieldMessage #-} C.yield msg
 {-# INLINE yieldMessage #-}
 
+-- TODO send vectored
 flushPending :: P2P ()
 flushPending = {-# SCC flushPending #-} do
-  se <- ask
-  q  <- liftIO (getPending se)
-  -- TODO send vectored
-  mapM_ yieldMessage q
+  session <- ask
+  queue   <- liftIO (getPending session)
+  mapM_ yieldMessage queue
 
 {-----------------------------------------------------------------------
     P2P monad
@@ -327,7 +327,9 @@ data Event
 --     forall (Fragment block). isPiece block == True
 --
 awaitEvent :: P2P Event
-awaitEvent = {-# SCC awaitEvent #-} awaitMessage >>= go
+awaitEvent = {-# SCC awaitEvent #-} do
+    flushPending
+    awaitMessage >>= go
   where
     go KeepAlive = awaitEvent
     go Choke     = do
@@ -445,7 +447,9 @@ awaitEvent = {-# SCC awaitEvent #-} awaitMessage >>= go
 --   most likely will be ignored without any network IO.
 --
 yieldEvent  :: Event -> P2P ()
-yieldEvent e = {-# SCC yieldEvent #-} go e
+yieldEvent e = {-# SCC yieldEvent #-} do
+    go e
+    flushPending
   where
     go (Available ixs) = asks swarmSession >>= liftIO . available ixs
     go (Want      bix) = do
@@ -480,7 +484,7 @@ handleEvent action = awaitEvent >>= action >>= yieldEvent
 
 -- | Default P2P action.
 exchange :: Storage -> P2P ()
-exchange storage = {-# SCC exchange #-} (awaitEvent >>= handler)
+exchange storage = {-# SCC exchange #-} awaitEvent >>= handler
   where
     handler (Available bf) = do
       liftIO (print (completeness bf))
-- 
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