1 {-# LANGUAGE OverloadedStrings #-}
4 import Prelude hiding (log, length, readFile, getContents)
6 import Control.Concurrent (forkIO, killThread)
7 import Control.Concurrent.MVar (readMVar)
8 import Data.ByteString.Char8 (ByteString, getContents, readFile)
9 import qualified FuncTorrent.FileSystem as FS (createMsgChannel, pieceMapFromFile, run)
10 import FuncTorrent.Logger (initLogger, logMessage, logStop)
11 import FuncTorrent.Metainfo (Info(..), Metainfo(..), torrentToMetainfo)
12 import FuncTorrent.Peer (handlePeerMsgs)
13 import FuncTorrent.PieceManager (initPieceMap)
14 import qualified FuncTorrent.Server as Server
15 import FuncTorrent.Tracker (connectedPeers, initialTrackerState, trackerLoop)
16 import Network (PortID (PortNumber))
17 import System.IO (withFile, IOMode (ReadWriteMode))
18 import System.Directory (doesFileExist)
19 import System.Environment (getArgs)
20 import System.Exit (exitSuccess)
21 import System.Random (getStdGen, randomRs)
23 logError :: String -> (String -> IO ()) -> IO ()
24 logError e logMsg = logMsg $ "parse error: \n" ++ e
30 usage = putStrLn "usage: functorrent torrent-file"
32 parse :: [String] -> IO ByteString
33 parse [] = getContents
35 fileExist <- doesFileExist a
38 else error "file does not exist"
41 -- peer id is exactly 20 bytes long.
42 -- peer id starts with '-', followed by 2 char client id'
43 -- followed by 4 ascii digits for version number, followed by
44 -- a '-'. Rest are random digits to fill the 20 bytes.
48 let digits = randomRs (0, 9) stdgen :: [Integer]
49 return $ "-HS9001-" ++ (concatMap show $ take (20 - 8) digits)
56 let log = logMessage logR
57 log "Starting up functorrent"
58 log $ "Parsing arguments " ++ concat args
59 torrentStr <- parse args
60 case torrentToMetainfo torrentStr of
61 Left e -> logError e log
63 -- if we had downloaded the file before (partly or completely)
64 -- then we should check the current directory for the existence
65 -- of the file and then update the map of each piece' availability.
66 -- This can be done by reading each piece and verifying the checksum.
67 -- If the checksum does not match, we don't have that piece.
68 let filePath = name (info m) -- really this is just the file name, not file path
69 fileLen = lengthInBytes (info m)
70 pieceHash = pieces (info m)
71 pLen = pieceLength (info m)
72 defaultPieceMap = initPieceMap pieceHash fileLen pLen
73 log $ "create FS msg channel"
74 fsMsgChannel <- FS.createMsgChannel
75 log $ "Downloading file : " ++ filePath
76 pieceMap <- FS.pieceMapFromFile filePath fileLen defaultPieceMap
77 log $ "start filesystem manager thread"
78 fsTid <- forkIO $ withFile filePath ReadWriteMode (FS.run pieceMap fsMsgChannel)
79 log $ "starting server"
80 (serverSock, (PortNumber portnum)) <- Server.start
81 log $ "server started on " ++ show portnum
82 log "Trying to fetch peers"
83 _ <- forkIO $ Server.run serverSock peerId m pieceMap fsMsgChannel
84 log $ "Trackers: " ++ head (announceList m)
85 -- (tstate, errstr) <- runTracker portnum peerId m
86 tstate <- initialTrackerState $ lengthInBytes $ info m
87 _ <- forkIO $ trackerLoop portnum peerId m tstate >> return ()
88 ps <- readMVar (connectedPeers tstate)
89 log $ "Peers List : " ++ (show ps)
91 handlePeerMsgs p1 peerId m pieceMap True fsMsgChannel