1 {-# LANGUAGE OverloadedStrings #-}
3 Copyright (C) 2015-2016 Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
5 This file is part of FuncTorrent.
7 FuncTorrent is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 FuncTorrent is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with FuncTorrent; if not, see <http://www.gnu.org/licenses/>
23 import Prelude hiding (log, length, readFile, getContents)
25 import Control.Concurrent (forkIO, killThread)
26 import Control.Concurrent.MVar (readMVar)
27 import Data.ByteString.Char8 (ByteString, getContents, readFile)
28 import qualified FuncTorrent.FileSystem as FS (createMsgChannel, pieceMapFromFile, run)
29 import FuncTorrent.Logger (initLogger, logMessage, logStop)
30 import FuncTorrent.Metainfo (Info(..), Metainfo(..), torrentToMetainfo)
31 import FuncTorrent.Peer (handlePeerMsgs)
32 import FuncTorrent.PieceManager (initPieceMap)
33 import qualified FuncTorrent.Server as Server
34 import FuncTorrent.Tracker (runTracker, getConnectedPeers, newTracker)
35 import Network (PortID (PortNumber))
36 import System.IO (withFile, IOMode (ReadWriteMode))
37 import System.Directory (doesFileExist)
38 import System.Environment (getArgs)
39 import System.Exit (exitSuccess)
40 import System.Random (getStdGen, randomRs)
42 logError :: String -> (String -> IO ()) -> IO ()
43 logError e logMsg = logMsg $ "parse error: \n" ++ e
49 usage = "usage: functorrent torrent-file"
51 parse :: [String] -> IO ByteString
52 parse [] = getContents
54 fileExist <- doesFileExist a
57 else error "file does not exist"
60 -- peer id is exactly 20 bytes long.
61 -- peer id starts with '-', followed by 2 char client id'
62 -- followed by 4 ascii digits for version number, followed by
63 -- a '-'. Rest are random digits to fill the 20 bytes.
67 let digits = randomRs (0, 9) stdgen :: [Integer]
68 return $ "-HS9001-" ++ (concatMap show $ take (20 - 8) digits)
75 let log = logMessage logR
80 log "Starting up functorrent"
81 log $ "Parsing arguments " ++ concat args
82 torrentStr <- parse args
83 case torrentToMetainfo torrentStr of
84 Left e -> logError e log
86 -- if we had downloaded the file before (partly or completely)
87 -- then we should check the current directory for the existence
88 -- of the file and then update the map of each piece' availability.
89 -- This can be done by reading each piece and verifying the checksum.
90 -- If the checksum does not match, we don't have that piece.
91 let filePath = name (info m) -- really this is just the file name, not file path
92 fileLen = lengthInBytes (info m)
93 pieceHash = pieces (info m)
94 pLen = pieceLength (info m)
96 defaultPieceMap = initPieceMap pieceHash fileLen pLen
97 log $ "create FS msg channel"
98 fsMsgChannel <- FS.createMsgChannel
99 log $ "Downloading file : " ++ filePath
100 pieceMap <- FS.pieceMapFromFile filePath fileLen defaultPieceMap
101 log $ "start filesystem manager thread"
102 fsTid <- forkIO $ withFile filePath ReadWriteMode (FS.run pieceMap fsMsgChannel)
103 log $ "starting server"
104 (serverSock, (PortNumber portnum)) <- Server.start
105 log $ "server started on " ++ show portnum
106 log "Trying to fetch peers"
107 _ <- forkIO $ Server.run serverSock peerId m pieceMap fsMsgChannel
108 log $ "Trackers: " ++ head (announceList m)
109 trackerMsgChan <- newTracker
110 _ <- forkIO $ runTracker trackerMsgChan fsMsgChannel infohash portnum peerId (announceList m) fileLen
111 ps <- getConnectedPeers trackerMsgChan
112 log $ "Peers List : " ++ (show ps)
114 handlePeerMsgs p1 peerId m pieceMap True fsMsgChannel