From ab9137ae8ac88a7dc0d15593a9754704e4058a52 Mon Sep 17 00:00:00 2001
From: Sam T <pxqr.sta@gmail.com>
Date: Sun, 7 Jul 2013 01:15:57 +0400
Subject: ~ Move exchange function to Exchange module.

---
 src/Network/BitTorrent.hs          | 40 --------------------------------
 src/Network/BitTorrent/Exchange.hs | 47 ++++++++++++++++++++++++++++++++++----
 2 files changed, 43 insertions(+), 44 deletions(-)

diff --git a/src/Network/BitTorrent.hs b/src/Network/BitTorrent.hs
index ef144f1f..c72498d0 100644
--- a/src/Network/BitTorrent.hs
+++ b/src/Network/BitTorrent.hs
@@ -115,43 +115,3 @@ discover swarm @ SwarmSession {..} action = {-# SCC discover #-} do
       addr <- getPeerAddr tses
       spawnP2P swarm addr $ do
         action
-
--- Event translation table looks like:
---
---   Available -> Want
---   Want      -> Fragment
---   Fragment  -> Available
---
--- If we join the chain we get the event loop:
---
---   Available -> Want -> Fragment --\
---      /|\                           |
---       \---------------------------/
---
-
-
--- | Default P2P action.
-exchange :: Storage -> P2P ()
-exchange storage = {-# SCC exchange #-} (awaitEvent >>= handler)
-  where
-    handler (Available bf) = do
-      liftIO (print (completeness bf))
-      ixs <- selBlk (findMin bf) storage
-      mapM_ (yieldEvent . Want) ixs -- TODO yield vectored
-
-    handler (Want     bix) = do
-      blk <- liftIO $ getBlk bix storage
-      yieldEvent (Fragment blk)
-
-    handler (Fragment blk @ Block {..}) = do
-      liftIO $ print (ppBlock blk)
-      done <- liftIO $ putBlk blk storage
-      when done $ do
-        yieldEvent $ Available $ singleton blkPiece (succ blkPiece)
-
-        -- WARN this is not reliable: if peer do not return all piece
-        -- block we could slow don't until some other event occured
-        offer <- peerOffer
-        if BF.null offer
-          then return ()
-          else handler (Available offer)
diff --git a/src/Network/BitTorrent/Exchange.hs b/src/Network/BitTorrent/Exchange.hs
index b0a94853..3f3346d2 100644
--- a/src/Network/BitTorrent/Exchange.hs
+++ b/src/Network/BitTorrent/Exchange.hs
@@ -60,6 +60,7 @@ module Network.BitTorrent.Exchange
        , awaitEvent
        , yieldEvent
        , handleEvent
+       , exchange
 
          -- * Exceptions
        , disconnect
@@ -85,16 +86,14 @@ import Data.Conduit.Network
 import Data.Serialize as S
 import Text.PrettyPrint as PP hiding (($$))
 
-
 import Network
 
-
+import Data.Bitfield as BF
 import Network.BitTorrent.Internal
 import Network.BitTorrent.Extension
 import Network.BitTorrent.Peer
 import Network.BitTorrent.Exchange.Protocol
-import Data.Bitfield as BF
-
+import System.Torrent.Storage
 
 {-----------------------------------------------------------------------
     Peer wire
@@ -464,3 +463,43 @@ yieldEvent e = {-# SCC yieldEvent #-} go e
 
 handleEvent :: (Event -> P2P Event) -> P2P ()
 handleEvent action = awaitEvent >>= action >>= yieldEvent
+
+-- Event translation table looks like:
+--
+--   Available -> Want
+--   Want      -> Fragment
+--   Fragment  -> Available
+--
+-- If we join the chain we get the event loop:
+--
+--   Available -> Want -> Fragment --\
+--      /|\                           |
+--       \---------------------------/
+--
+
+
+-- | Default P2P action.
+exchange :: Storage -> P2P ()
+exchange storage = {-# SCC exchange #-} (awaitEvent >>= handler)
+  where
+    handler (Available bf) = do
+      liftIO (print (completeness bf))
+      ixs <- selBlk (findMin bf) storage
+      mapM_ (yieldEvent . Want) ixs -- TODO yield vectored
+
+    handler (Want     bix) = do
+      blk <- liftIO $ getBlk bix storage
+      yieldEvent (Fragment blk)
+
+    handler (Fragment blk @ Block {..}) = do
+      liftIO $ print (ppBlock blk)
+      done <- liftIO $ putBlk blk storage
+      when done $ do
+        yieldEvent $ Available $ singleton blkPiece (succ blkPiece)
+
+        -- WARN this is not reliable: if peer do not return all piece
+        -- block we could slow don't until some other event occured
+        offer <- peerOffer
+        if BF.null offer
+          then return ()
+          else handler (Available offer)
-- 
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