From e9607a7392e67e4bb508c570313cb6688e9c283c Mon Sep 17 00:00:00 2001
From: Sam Truzjan <pxqr.sta@gmail.com>
Date: Fri, 13 Dec 2013 06:04:46 +0400
Subject: Remove old exchange session

---
 src/Network/BitTorrent/Exchange/Session.hs | 110 ++++-------------------------
 1 file changed, 14 insertions(+), 96 deletions(-)

diff --git a/src/Network/BitTorrent/Exchange/Session.hs b/src/Network/BitTorrent/Exchange/Session.hs
index c24e2b0b..d455ec65 100644
--- a/src/Network/BitTorrent/Exchange/Session.hs
+++ b/src/Network/BitTorrent/Exchange/Session.hs
@@ -20,109 +20,27 @@ import Network.BitTorrent.Exchange.Message
 import Network.BitTorrent.Exchange.Status
 
 
-type Extension = ()
-
 data ExchangeError
   = InvalidPieceIx PieceIx
   | InvalidBlock   BlockIx
   | CorruptedPiece PieceIx
 
--- | Peer session contain all data necessary for peer to peer
--- communication.
-data ExchangeSession = ExchangeSession
-  { -- | Used as unique identifier of the session.
-    connectedPeerAddr :: !PeerAddr
-
-    -- | Extensions such that both peer and client support.
-  , enabledExtensions :: [Extension]
-
-    -- | Broadcast messages waiting to be sent to peer.
-  , pendingMessages    :: !(TChan   Message)
-
-    -- | Dymanic P2P data.
-  , sessionState       :: !(IORef  SessionState)
+data Session = Session
+  { storage   :: Storage
+  , bitfield  :: Bitfield
+  , assembler :: Assembler
+  , peerId    :: PeerId
   }
 
-instance Eq ExchangeSession where
-  (==) = (==) `on` connectedPeerAddr
-  {-# INLINE (==) #-}
-
-instance Ord ExchangeSession where
-  compare = comparing connectedPeerAddr
-  {-# INLINE compare #-}
-
-enqueueBroadcast :: ExchangeSession -> Message -> IO ()
-enqueueBroadcast = undefined
-
-dequeueBroadcast :: ExchangeSession -> IO Message
-dequeueBroadcast = undefined
-
-{-----------------------------------------------------------------------
---  Session state
------------------------------------------------------------------------}
-
-data SessionState = SessionState
-  { _bitfield :: !Bitfield      -- ^ Other peer Have bitfield.
-  , _status   :: !SessionStatus -- ^ Status of both peers.
-  } deriving (Show, Eq)
-
-$(makeLenses ''SessionState)
-
---initialSessionState :: PieceCount -> SessionState
---initialSessionState pc = SessionState (haveNone pc) def
-
---getSessionState :: PeerSession -> IO SessionState
---getSessionState PeerSession {..} = readIORef sessionState
-
-{-
-{-----------------------------------------------------------------------
---  Broadcasting: Have, Cancel, Bitfield, SuggestPiece
------------------------------------------------------------------------}
-{-
-Here we should enqueue broadcast messages and keep in mind that:
-  * We should enqueue broadcast events as they are appear.
-  * We should yield broadcast messages as fast as we get them.
-
-these 2 phases might differ in time significantly
-
-**TODO**: do this; but only when it'll be clean which other broadcast
-messages & events we should send.
-
-1. Update client have bitfield --\____ in one transaction;
-2. Update downloaded stats     --/
-3. Signal to the all other peer about this.
--}
-
-available :: Bitfield -> SwarmSession -> STM ()
-available bf SwarmSession {..} = {-# SCC available #-} do
-    updateProgress >> broadcast
-  where
-    updateProgress = do
-      let piLen = ciPieceLength $ tInfo $ torrentMeta
-      let bytes = piLen * BF.haveCount bf
-      modifyTVar' (currentProgress clientSession) (downloadedProgress bytes)
-
-    broadcast = mapM_ (writeTChan broadcastMessages . Have) (BF.toList bf)
-
--- TODO compute size of messages: if it's faster to send Bitfield
--- instead many Have do that
+type Exchange = StateT Session (ReaderT Connection IO)
 
--- Also if there is single Have message in queue then the
--- corresponding piece is likely still in memory or disc cache,
--- when we can send SuggestPiece.
+--runExchange :: Exchange () -> [PeerAddr] -> IO ()
+--runExchange exchange peers = do
+--  forM_ peers $ \ peer -> do
+--    forkIO $ runReaderT (runStateT exchange session )
 
-readAvail :: TChan a -> STM [a]
-readAvail chan = do
-  m <- tryReadTChan chan
-  case m of
-    Just a  -> (:) <$> pure a <*> readAvail chan
-    Nothing -> return []
+awaitEvent :: Exchange Event
+awaitEvent = undefined
 
--- | Get pending messages queue appeared in result of asynchronously
---   changed client state. Resulting queue should be sent to a peer
--- immediately.
---
-getPending :: PeerSession -> IO [Message]
-getPending PeerSession {..} = {-# SCC getPending #-} do
-  atomically (readAvail pendingMessages)
--}
\ No newline at end of file
+yieldEvent :: Exchange Event
+yieldEvent = undefined
-- 
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