new modules FileSystem and PieceManager

[functorrent.git] / src / main / Main.hs

diff --git a/src/main/Main.hs b/src/main/Main.hs
index 0a514104703485beda12b9206226fe44acbb6bc5..a75f01c122df050615e645c4ba9f0fb4f55563da 100644 (file)
--- a/src/main/Main.hs
+++ b/src/main/Main.hs
@@ -1,21 +1,24 @@
 {-# LANGUAGE OverloadedStrings #-}
 module Main where
 
-import Prelude hiding (log, length, readFile, getContents)
+import           Prelude hiding (log, length, readFile, getContents)
 
-import Control.Concurrent (forkIO)
-import Data.ByteString.Char8 (ByteString, getContents, readFile, unpack)
-import Network (PortID (PortNumber))
-import System.Environment (getArgs)
-import System.Exit (exitSuccess)
-import System.Directory (doesFileExist)
-import System.Random (getStdGen, randomRs)
-
-import FuncTorrent.Logger (initLogger, logMessage, logStop)
-import FuncTorrent.Metainfo (Info(..), Metainfo(..), torrentToMetainfo)
-import FuncTorrent.Peer (handlePeerMsgs)
+import           Control.Concurrent (forkIO)
+import           Control.Concurrent.MVar (readMVar)
+import           Data.ByteString.Char8 (ByteString, getContents, readFile)
+import qualified FuncTorrent.FileSystem as FS (initFS, pieceMapFromFile, startThread)
+import           FuncTorrent.Logger (initLogger, logMessage, logStop)
+import           FuncTorrent.Metainfo (Info(..), Metainfo(..), torrentToMetainfo)
+import           FuncTorrent.Peer (handlePeerMsgs)
+import           FuncTorrent.PieceManager (initPieceMap)
 import qualified FuncTorrent.Server as Server
-import FuncTorrent.Tracker (peers, getTrackerResponse)
+import           FuncTorrent.Tracker (connectedPeers, initialTrackerState, trackerLoop, udpTrackerLoop)
+import           FuncTorrent.Utils (createDummyFile)
+import           Network (PortID (PortNumber))
+import           System.Directory (doesFileExist)
+import           System.Environment (getArgs)
+import           System.Exit (exitSuccess)
+import           System.Random (getStdGen, randomRs)
 
 logError :: String -> (String -> IO ()) -> IO ()
 logError e logMsg = logMsg $ "parse error: \n" ++ e
@@ -57,20 +60,40 @@ main = do
     case torrentToMetainfo torrentStr of
      Left e -> logError e log
      Right m -> do
-       log "Input File OK"
-       log $ "Downloading file : " ++ name (info m)
-
+       -- if we had downloaded the file before (partly or completely)
+       -- then we should check the current directory for the existence
+       -- of the file and then update the map of each piece' availability.
+       -- This can be done by reading each piece and verifying the checksum.
+       -- If the checksum does not match, we don't have that piece.
+       let filePath = name (info m) -- really this is just the file name, not file path
+           fileLen = lengthInBytes (info m)
+           pieceHash = pieces (info m)
+           pLen = pieceLength (info m)
+           defaultPieceMap = initPieceMap pieceHash fileLen pLen
+       log $ "create FS msg channel"
+       (handle, fsMsgChannel) <- FS.initFS filePath
+       log $ "Downloading file : " ++ filePath
+       dfe <- doesFileExist filePath
+       pieceMap <- if dfe
+                   then
+                     FS.pieceMapFromFile handle defaultPieceMap
+                   else do
+                     -- create a dummy file
+                     createDummyFile filePath (fromIntegral fileLen) >>
+                       return defaultPieceMap
+       log $ "start filesystem manager thread"
+       FS.startThread handle fsMsgChannel pieceMap
        log $ "starting server"
        (serverSock, (PortNumber portnum)) <- Server.start
        log $ "server started on " ++ show portnum
        log "Trying to fetch peers"
-       forkIO $ Server.run serverSock peerId m
+       _ <- forkIO $ Server.run serverSock peerId m pieceMap fsMsgChannel
        log $ "Trackers: " ++ head (announceList m)
-       trackerResp <- getTrackerResponse portnum peerId m
-       case  trackerResp of
-        Left e -> log $ "Error" ++ unpack e
-        Right peerList -> do
-          log $ "Peers List : " ++ (show . peers $ peerList)
-          let p1 = head (peers peerList)
-          handlePeerMsgs p1 peerId m
-    logStop logR
+       -- (tstate, errstr) <- runTracker portnum peerId m
+       tstate <- initialTrackerState $ lengthInBytes $ info m
+       _ <- forkIO $ trackerLoop portnum peerId m tstate >> return ()
+       ps <- readMVar (connectedPeers tstate)
+       log $ "Peers List : " ++ (show ps)
+       let p1 = head ps
+       handlePeerMsgs p1 peerId m pieceMap True fsMsgChannel
+       logStop logR