main: remove redundant import

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

diff --git a/src/main/Main.hs b/src/main/Main.hs
index b82d27a5f859acbc60c5fdb75d703cda80ab068a..623fe318e6ea6c8f856d79136edaa6b4ed84400e 100644 (file)
--- a/src/main/Main.hs
+++ b/src/main/Main.hs
@@ -1,25 +1,28 @@
 {-# LANGUAGE OverloadedStrings #-}
 module Main where
 
-import Prelude hiding (log, length, readFile, getContents)
+import           Prelude hiding (log, length, readFile, getContents)
 
-import Control.Monad.Reader(runReaderT)
-import Data.ByteString.Char8 (ByteString, getContents, readFile, unpack)
-import System.Environment (getArgs)
-import System.Exit (exitSuccess)
-import System.Directory (doesFileExist)
-
-import FuncTorrent.Logger (initLogger, logMessage, logStop)
-import FuncTorrent.Metainfo (Info(..), Metainfo(..), torrentToMetainfo)
-import FuncTorrent.Peer (handlePeerMsgs)
-import FuncTorrent.Tracker (peers, getTrackerResponse)
+import           Control.Concurrent (forkIO, killThread)
+import           Control.Concurrent.MVar (readMVar)
+import           Data.ByteString.Char8 (ByteString, getContents, readFile)
+import qualified FuncTorrent.FileSystem as FS (createMsgChannel, pieceMapFromFile, run)
+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 (connectedPeers, initialTrackerState, trackerLoop, udpTrackerLoop)
+import           Network (PortID (PortNumber))
+import           System.IO (withFile, IOMode (ReadWriteMode))
+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
 
-peerId :: String
-peerId = "-HS0001-*-*-20150215"
-
 exit :: IO ByteString
 exit = exitSuccess
 
@@ -35,10 +38,21 @@ parse [a] = do
     else error "file does not exist"
 parse _ = exit
 
+-- peer id is exactly 20 bytes long.
+-- peer id starts with '-', followed by 2 char client id'
+-- followed by 4 ascii digits for version number, followed by
+-- a '-'. Rest are random digits to fill the 20 bytes.
+mkPeerID :: IO String
+mkPeerID = do
+  stdgen <- getStdGen
+  let digits = randomRs (0, 9) stdgen :: [Integer]
+  return $ "-HS9001-" ++ (concatMap show $ take (20 - 8) digits)
+
 main :: IO ()
 main = do
     args <- getArgs
     logR <- initLogger
+    peerId <- mkPeerID    
     let log = logMessage logR
     log "Starting up functorrent"
     log $ "Parsing arguments " ++ concat args
@@ -46,16 +60,34 @@ 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"
+       fsMsgChannel <- FS.createMsgChannel
+       log $ "Downloading file : " ++ filePath
+       pieceMap <- FS.pieceMapFromFile filePath fileLen defaultPieceMap
+       log $ "start filesystem manager thread"
+       fsTid <- forkIO $ withFile filePath ReadWriteMode (FS.run pieceMap fsMsgChannel)
+       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 pieceMap fsMsgChannel
        log $ "Trackers: " ++ head (announceList m)
-       trackerResp <- runReaderT (getTrackerResponse 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
+       killThread fsTid