X-Git-Url: https://git.rkrishnan.org/?a=blobdiff_plain;f=src%2FFuncTorrent%2FPeer.hs;h=c833c061bd4285be88f3754e62e5b83774c1d806;hb=08f3238a8162039a1b77f4fb8825a56a34203c02;hp=6131a6bb58750d6cf2548c9680b81b822ef5f5ab;hpb=ebc045715374d3418a0c1466f6ae95252603899c;p=functorrent.git diff --git a/src/FuncTorrent/Peer.hs b/src/FuncTorrent/Peer.hs index 6131a6b..c833c06 100644 --- a/src/FuncTorrent/Peer.hs +++ b/src/FuncTorrent/Peer.hs @@ -1,28 +1,44 @@ +{- + - Copyright (C) 2015-2016 Ramakrishnan Muthukrishnan + - + - This file is part of FuncTorrent. + - + - FuncTorrent is free software; you can redistribute it and/or modify + - it under the terms of the GNU General Public License as published by + - the Free Software Foundation; either version 3 of the License, or + - (at your option) any later version. + - + - FuncTorrent is distributed in the hope that it will be useful, + - but WITHOUT ANY WARRANTY; without even the implied warranty of + - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + - GNU General Public License for more details. + - + - You should have received a copy of the GNU General Public License + - along with FuncTorrent; if not, see + -} + {-# LANGUAGE OverloadedStrings #-} + module FuncTorrent.Peer - (Peer(..), - PieceMap, - handlePeerMsgs, - bytesDownloaded, - initPieceMap, - pieceMapFromFile + (PieceMap, + handlePeerMsgs ) where -import Prelude hiding (lookup, concat, replicate, splitAt, take, drop, filter) +import Prelude hiding (lookup, concat, replicate, splitAt, take, drop) -import System.IO (Handle, BufferMode(..), hSetBuffering, hClose) -import Data.ByteString (ByteString, unpack, concat, hGet, hPut, take, drop, empty) -import qualified Data.ByteString.Char8 as BC (length) -import Network (connectTo, PortID(..)) import Control.Monad.State +import Data.ByteString (ByteString, unpack, concat, hGet, hPut, take, drop, empty) import Data.Bits import Data.Word (Word8) -import Data.Map (Map, fromList, toList, (!), mapWithKey, traverseWithKey, adjust, filter) -import Safe (headMay) +import Data.Map ((!), adjust) +import Network (connectTo, PortID(..)) +import System.IO (Handle, BufferMode(..), hSetBuffering, hClose) -import FuncTorrent.Metainfo (Info(..), Metainfo(..)) -import FuncTorrent.Utils (splitN, splitNum, writeFileAtOffset, readFileAtOffset, verifyHash) +import FuncTorrent.Metainfo (Metainfo(..)) import FuncTorrent.PeerMsgs (Peer(..), PeerMsg(..), sendMsg, getMsg, genHandshakeMsg) +import FuncTorrent.Utils (splitNum, verifyHash) +import FuncTorrent.PieceManager (PieceDlState(..), PieceData(..), PieceMap, pickPiece, updatePieceAvailability) +import qualified FuncTorrent.FileSystem as FS (MsgChannel, writePieceToDisk) data PState = PState { handle :: Handle , peer :: Peer @@ -31,80 +47,38 @@ data PState = PState { handle :: Handle , heChoking :: Bool , heInterested :: Bool} -type PeerState = State PState - -data PieceDlState = Pending - | Downloading - | Have - deriving (Show, Eq) - --- todo - map with index to a new data structure (peers who have that piece and state) -data PieceData = PieceData { peers :: [Peer] -- ^ list of peers who have this piece - , dlstate :: PieceDlState -- ^ state of the piece from download perspective. - , hash :: ByteString -- ^ piece hash - , len :: Integer } -- ^ piece length - --- which piece is with which peers -type PieceMap = Map Integer PieceData - - --- Make the initial Piece map, with the assumption that no peer has the --- piece and that every piece is pending download. -initPieceMap :: ByteString -> Integer -> Integer -> PieceMap -initPieceMap pieceHash fileLen pieceLen = fromList kvs - where - numPieces = (toInteger . (`quot` 20) . BC.length) pieceHash - kvs = [(i, PieceData { peers = [] - , dlstate = Pending - , hash = h - , len = pLen }) - | (i, h, pLen) <- zip3 [0..numPieces] hashes pLengths] - hashes = splitN 20 pieceHash - pLengths = splitNum fileLen pieceLen - -pieceMapFromFile :: FilePath -> PieceMap -> IO PieceMap -pieceMapFromFile filePath pieceMap = - traverseWithKey f pieceMap - where - f k v = do - let offset = if k == 0 then 0 else k * len (pieceMap ! (k - 1)) - isHashValid <- flip verifyHash (hash v) <$> readFileAtOffset filePath offset (len v) - if isHashValid - then return $ v { dlstate = Have } - else return v - havePiece :: PieceMap -> Integer -> Bool havePiece pm index = dlstate (pm ! index) == Have connectToPeer :: Peer -> IO Handle -connectToPeer (Peer _ ip port) = do +connectToPeer (Peer ip port) = do h <- connectTo ip (PortNumber (fromIntegral port)) hSetBuffering h LineBuffering return h doHandshake :: Bool -> Handle -> Peer -> ByteString -> String -> IO () -doHandshake True h peer infoHash peerid = do - let hs = genHandshakeMsg infoHash peerid +doHandshake True h p infohash peerid = do + let hs = genHandshakeMsg infohash peerid hPut h hs - putStrLn $ "--> handhake to peer: " ++ show peer + putStrLn $ "--> handhake to peer: " ++ show p _ <- hGet h (length (unpack hs)) - putStrLn $ "<-- handshake from peer: " ++ show peer + putStrLn $ "<-- handshake from peer: " ++ show p return () -doHandshake False h peer infoHash peerid = do - let hs = genHandshakeMsg infoHash peerid +doHandshake False h p infohash peerid = do + let hs = genHandshakeMsg infohash peerid putStrLn "waiting for a handshake" hsMsg <- hGet h (length (unpack hs)) - putStrLn $ "<-- handshake from peer: " ++ show peer + putStrLn $ "<-- handshake from peer: " ++ show p let rxInfoHash = take 20 $ drop 28 hsMsg - if rxInfoHash /= infoHash + if rxInfoHash /= infohash then do putStrLn "infoHashes does not match" hClose h return () else do _ <- hPut h hs - putStrLn $ "--> handhake to peer: " ++ show peer + putStrLn $ "--> handhake to peer: " ++ show p return () bitfieldToList :: [Word8] -> [Integer] @@ -131,41 +105,24 @@ toPeerState h p meCh meIn heCh heIn = , meChoking = meCh , meInterested = meIn } --- simple algorithm to pick piece. --- pick the first piece from 0 that is not downloaded yet. -pickPiece :: PieceMap -> Maybe Integer -pickPiece = - (fst `liftM`) . headMay . toList . filter (\v -> dlstate v == Pending) - -bytesDownloaded :: PieceMap -> Integer -bytesDownloaded = - sum . map (len . snd) . toList . filter (\v -> dlstate v == Have) - -updatePieceAvailability :: PieceMap -> Peer -> [Integer] -> PieceMap -updatePieceAvailability pieceStatus p pieceList = - mapWithKey (\k pd -> if k `elem` pieceList - then (pd { peers = p : peers pd }) - else pd) pieceStatus - -handlePeerMsgs :: Peer -> String -> Metainfo -> PieceMap -> Bool -> IO () -handlePeerMsgs p peerId m pieceMap isClient = do +handlePeerMsgs :: Peer -> String -> Metainfo -> PieceMap -> Bool -> FS.MsgChannel -> IO () +handlePeerMsgs p peerId m pieceMap isClient c = do h <- connectToPeer p doHandshake isClient h p (infoHash m) peerId let pstate = toPeerState h p False False True True - filePath = name (info m) - _ <- runStateT (msgLoop pieceMap filePath) pstate + _ <- runStateT (msgLoop pieceMap c) pstate return () -msgLoop :: PieceMap -> FilePath -> StateT PState IO () -msgLoop pieceStatus file = do +msgLoop :: PieceMap -> FS.MsgChannel -> StateT PState IO () +msgLoop pieceStatus msgchannel = do h <- gets handle st <- get case st of PState { meInterested = False, heChoking = True } -> do liftIO $ sendMsg h InterestedMsg gets peer >>= (\p -> liftIO $ putStrLn $ "--> InterestedMsg to peer: " ++ show p) - modify (\st -> st { meInterested = True }) - msgLoop pieceStatus file + modify (\st' -> st' { meInterested = True }) + msgLoop pieceStatus msgchannel PState { meInterested = True, heChoking = False } -> case pickPiece pieceStatus of Nothing -> liftIO $ putStrLn "Nothing to download" @@ -177,18 +134,17 @@ msgLoop pieceStatus file = do then liftIO $ putStrLn "Hash mismatch" else do - let fileOffset = if workPiece == 0 then 0 else workPiece * len (pieceStatus ! (workPiece - 1)) - liftIO $ putStrLn $ "Write into file at offset: " ++ show fileOffset - liftIO $ writeFileAtOffset file fileOffset pBS - msgLoop (adjust (\pieceData -> pieceData { dlstate = Have }) workPiece pieceStatus) file + liftIO $ putStrLn $ "Write piece: " ++ show workPiece + liftIO $ FS.writePieceToDisk msgchannel workPiece pBS + msgLoop (adjust (\pieceData -> pieceData { dlstate = Have }) workPiece pieceStatus) msgchannel _ -> do msg <- liftIO $ getMsg h - gets peer >>= (\p -> liftIO $ putStrLn $ "<-- " ++ show msg ++ "from peer: " ++ show p) + gets peer >>= (\p -> liftIO $ putStrLn $ "<-- " ++ show msg ++ " from peer: " ++ show p) case msg of KeepAliveMsg -> do liftIO $ sendMsg h KeepAliveMsg gets peer >>= (\p -> liftIO $ putStrLn $ "--> " ++ "KeepAliveMsg to peer: " ++ show p) - msgLoop pieceStatus file + msgLoop pieceStatus msgchannel BitFieldMsg bss -> do p <- gets peer let pieceList = bitfieldToList (unpack bss) @@ -197,25 +153,31 @@ msgLoop pieceStatus file = do -- 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 pieceStatus' file + msgLoop pieceStatus' msgchannel UnChokeMsg -> do - modify (\st -> st {heChoking = False }) - msgLoop pieceStatus file + modify (\st' -> st' {heChoking = False }) + msgLoop pieceStatus msgchannel ChokeMsg -> do - modify (\st -> st {heChoking = True }) - msgLoop pieceStatus file + modify (\st' -> st' {heChoking = True }) + msgLoop pieceStatus msgchannel InterestedMsg -> do - modify (\st -> st {heInterested = True}) - msgLoop pieceStatus file + modify (\st' -> st' {heInterested = True}) + msgLoop pieceStatus msgchannel NotInterestedMsg -> do - modify (\st -> st {heInterested = False}) - msgLoop pieceStatus file - CancelMsg _ _ _ -> -- check if valid index, begin, length - msgLoop pieceStatus file + modify (\st' -> st' {heInterested = False}) + msgLoop pieceStatus msgchannel + CancelMsg {} -> -- check if valid index, begin, length + msgLoop pieceStatus msgchannel PortMsg _ -> - msgLoop pieceStatus file - -- handle RequestMsg, HaveMsg. No need to handle PieceMsg here. - -- also BitFieldMsg + msgLoop pieceStatus msgchannel + HaveMsg idx -> do + p <- gets peer + let pieceStatus' = updatePieceAvailability pieceStatus p [idx] + msgLoop pieceStatus' msgchannel + _ -> do + liftIO $ putStrLn ".. not doing anything with the msg" + msgLoop pieceStatus msgchannel + -- No need to handle PieceMsg and RequestMsg here. downloadPiece :: Handle -> Integer -> Integer -> IO ByteString @@ -235,6 +197,6 @@ downloadPiece h index pieceLength = do ++ show begin return block _ -> do - putStrLn "ignoring irrelevant msg" + putStrLn $ "ignoring irrelevant msg: " ++ show msg return empty)