X-Git-Url: https://git.rkrishnan.org/?a=blobdiff_plain;f=src%2FFuncTorrent%2FPeer.hs;h=c833c061bd4285be88f3754e62e5b83774c1d806;hb=08f3238a8162039a1b77f4fb8825a56a34203c02;hp=13c07e3a8e2ab8824670a6af416c824321924e05;hpb=aed979c1918b479dabac7ff0403a20868679c4c2;p=functorrent.git diff --git a/src/FuncTorrent/Peer.hs b/src/FuncTorrent/Peer.hs index 13c07e3..c833c06 100644 --- a/src/FuncTorrent/Peer.hs +++ b/src/FuncTorrent/Peer.hs @@ -1,27 +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(..), - handlePeerMsgs, - bytesDownloaded + (PieceMap, + handlePeerMsgs ) where -import Prelude hiding (lookup, concat, replicate, splitAt, take, filter) +import Prelude hiding (lookup, concat, replicate, splitAt, take, drop) -import System.IO (Handle, BufferMode(..), hSetBuffering) -import System.Directory (doesFileExist) -import Data.ByteString (ByteString, unpack, concat, hGet, hPut, take, 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 qualified Crypto.Hash.SHA1 as SHA1 (hash) -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, createDummyFile, writeFileAtOffset, readFileAtOffset) +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 @@ -30,74 +47,39 @@ 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) - -updatePieceMap :: FilePath -> PieceMap -> IO PieceMap -updatePieceMap filePath pieceMap = do - dfe <- doesFileExist filePath - -- TODO: this is not enough, file should have the same size as well - if dfe - then pieceMapFromFile filePath pieceMap - else return pieceMap - -pieceMapFromFile :: FilePath -> PieceMap -> IO PieceMap -pieceMapFromFile filePath pieceMap = do - 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 :: Handle -> Peer -> ByteString -> String -> IO () -doHandshake h peer infoHash peerid = do - let hs = genHandshakeMsg infoHash peerid +doHandshake :: Bool -> Handle -> Peer -> ByteString -> String -> IO () +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 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 p + let rxInfoHash = take 20 $ drop 28 hsMsg + if rxInfoHash /= infohash + then do + putStrLn "infoHashes does not match" + hClose h + return () + else do + _ <- hPut h hs + putStrLn $ "--> handhake to peer: " ++ show p + return () bitfieldToList :: [Word8] -> [Integer] bitfieldToList bs = go bs 0 @@ -123,47 +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 -> IO () -handlePeerMsgs p peerId m = do +handlePeerMsgs :: Peer -> String -> Metainfo -> PieceMap -> Bool -> FS.MsgChannel -> IO () +handlePeerMsgs p peerId m pieceMap isClient c = do h <- connectToPeer p - doHandshake h p (infoHash m) peerId + doHandshake isClient h p (infoHash m) peerId let pstate = toPeerState h p False False True True - pieceHash = pieces (info m) - pLen = pieceLength (info m) - fileLen = lengthInBytes (info m) - fileName = name (info m) - pieceStatus = initPieceMap pieceHash fileLen pLen - pieceStatus' <- updatePieceMap fileName pieceStatus - createDummyFile fileName (fromIntegral fileLen) - _ <- runStateT (msgLoop pieceStatus' fileName) 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" @@ -173,20 +132,19 @@ msgLoop pieceStatus file = do pBS <- liftIO $ downloadPiece h workPiece pLen if not $ verifyHash pBS (hash (pieceStatus ! workPiece)) then - liftIO $ putStrLn $ "Hash mismatch: " ++ show (hash (pieceStatus ! workPiece)) ++ " vs " ++ show (take 20 (SHA1.hash pBS)) + 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) @@ -195,10 +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 msgchannel + InterestedMsg -> do + modify (\st' -> st' {heInterested = True}) + msgLoop pieceStatus msgchannel + NotInterestedMsg -> do + modify (\st' -> st' {heInterested = False}) + msgLoop pieceStatus msgchannel + CancelMsg {} -> -- check if valid index, begin, length + msgLoop pieceStatus msgchannel + PortMsg _ -> + 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 @@ -218,9 +197,6 @@ downloadPiece h index pieceLength = do ++ show begin return block _ -> do - putStrLn "ignoring irrelevant msg" + putStrLn $ "ignoring irrelevant msg: " ++ show msg return empty) -verifyHash :: ByteString -> ByteString -> Bool -verifyHash bs pieceHash = - take 20 (SHA1.hash bs) == pieceHash