From: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
Date: Fri, 24 Jul 2015 09:23:05 +0000 (+0530)
Subject: send request msg and get the piecemsg back
X-Git-Url: https://git.rkrishnan.org/Site/Content/Exhibitors/%22news.html/%22file:/cyclelanguage?a=commitdiff_plain;h=6851f654c413b599ba7a71bb059637c1b0579c51;p=functorrent.git

send request msg and get the piecemsg back
---

diff --git a/src/FuncTorrent/Peer.hs b/src/FuncTorrent/Peer.hs
index 4da3d0b..33d72a3 100644
--- a/src/FuncTorrent/Peer.hs
+++ b/src/FuncTorrent/Peer.hs
@@ -194,38 +194,44 @@ createDummyFile path size =
 -- loop1 :: shake hands with all peers, find out the pieces they have, form PieceData.
 -- recvMsg :: Peer -> Handle -> Msg
 msgLoop :: PeerState -> PieceMap -> IO ()
-msgLoop state pieceStatus = do
-  -- if meInterested and he NOT Choking, pick a piece to download
-  -- and send a requestmsg.
-  let isMeInterested = meInterested state
-      isHeChoking = heChoking state
-  if (not isMeInterested && isHeChoking)
-    then
-    do
-      let h = handle state
-      sendMsg h InterestedMsg
-      putStrLn $ "--> InterestedMsg to peer: " ++ show (peer state)
-      msgLoop (state { meInterested = True }) pieceStatus
-    else
-    do
-      msg <- getMsg (handle state)
-      putStrLn $ "<-- " ++ show msg ++ "from peer: " ++ show (peer state)
-      case msg of
-       KeepAliveMsg -> do
-         sendMsg (handle state) KeepAliveMsg
-         msgLoop state pieceStatus
-       BitFieldMsg bss -> do
-         let pieceList = bitfieldToList (unpack bss)
-             pieceStatus' = updatePieceAvailability pieceStatus (peer state) pieceList
-         print pieceList
-         -- for each pieceIndex in pieceList, make an entry in the pieceStatus
-         -- map with pieceIndex as the key and modify the value to add the peer.
-         -- download each of the piece in order
-         msgLoop state pieceStatus'
-       UnChokeMsg -> do
-         msgLoop (state { heChoking = False }) pieceStatus
-       _ -> do
-         msgLoop state pieceStatus
+msgLoop state pieceStatus | meInterested state == False &&
+                            heChoking state == True = do
+                              -- if meInterested and he NOT Choking, pick a piece to download
+                              -- and send a requestmsg.
+                              let h = handle state
+                              sendMsg h InterestedMsg
+                              putStrLn $ "--> InterestedMsg to peer: " ++ show (peer state)
+                              msgLoop (state { meInterested = True }) pieceStatus
+                          | meInterested state == True &&
+                            heChoking state == False =
+                              case pickPiece pieceStatus of
+                               Nothing -> putStrLn "Nothing to download"
+                               Just workPiece -> do
+                                 sendMsg (handle state) (RequestMsg workPiece 0 16384)
+                                 putStrLn $ "--> RequestMsg for Piece " ++ (show workPiece) ++ "to peer: " ++ show (peer state)
+                                 msg <- getMsg (handle state)
+                                 putStrLn $ "<-- " ++ show msg ++ "from peer: " ++ show (peer state)
+                                 -- msgLoop state pieceStatus
+                          | otherwise = do
+                              msg <- getMsg (handle state)
+                              putStrLn $ "<-- " ++ show msg ++ "from peer: " ++ show (peer state)
+                              case msg of
+                               KeepAliveMsg -> do
+                                 sendMsg (handle state) KeepAliveMsg
+                                 putStrLn $ "--> " ++ "KeepAliveMsg to peer: " ++ show (peer state)
+                                 msgLoop state pieceStatus
+                               BitFieldMsg bss -> do
+                                 let pieceList = bitfieldToList (unpack bss)
+                                     pieceStatus' = updatePieceAvailability pieceStatus (peer state) pieceList
+                                 print pieceList
+                                 -- for each pieceIndex in pieceList, make an entry in the pieceStatus
+                                 -- map with pieceIndex as the key and modify the value to add the peer.
+                                 -- download each of the piece in order
+                                 msgLoop state pieceStatus'
+                               UnChokeMsg -> do
+                                 msgLoop (state { heChoking = False }) pieceStatus
+                               _ -> do
+                                 msgLoop state pieceStatus
 
 -- simple algorithm to pick piece.
 -- pick the first piece from 0 that is not downloaded yet.