+{-# LANGUAGE OverloadedStrings #-}
module Main where
+import Prelude hiding (log, length, readFile, writeFile)
+import Data.ByteString.Char8 (ByteString, readFile, writeFile, length, unpack)
import System.Environment (getArgs)
-import System.Exit
-import qualified Data.ByteString.Char8 as BC
-import qualified Bencode as Benc
-import qualified Metainfo as MInfo
-import qualified Tracker as T
-import qualified Text.ParserCombinators.Parsec as Parsec
-import qualified Peer as P
-import Data.Functor
-
-printError :: Parsec.ParseError -> IO ()
-printError e = putStrLn $ "parse error: " ++ show e
+import System.Exit (exitSuccess)
+import System.Directory (doesFileExist)
+import Text.ParserCombinators.Parsec (ParseError)
+
+import FuncTorrent.Bencode (decode)
+import FuncTorrent.Logger (initLogger, logMessage, logStop)
+import FuncTorrent.Metainfo (Info(..), Metainfo(..), mkMetaInfo)
+import FuncTorrent.Peer (handShakeMsg)
+import FuncTorrent.Tracker (connect, peers, mkTrackerResponse)
+
+logError :: ParseError -> (String -> IO ()) -> IO ()
+logError e logMsg = logMsg $ "parse error: \n" ++ show e
peerId :: String
peerId = "-HS0001-*-*-20150215"
-exit :: IO BC.ByteString
+exit :: IO ByteString
exit = exitSuccess
usage :: IO ()
usage = putStrLn "usage: functorrent torrent-file"
-parse :: [String] -> IO BC.ByteString
+parse :: [String] -> IO ByteString
parse [] = usage >> exit
-parse [a] = BC.readFile a
+parse [a] = do
+ fileExist <- doesFileExist a
+ if fileExist
+ then readFile a
+ else error "file does not exist"
parse _ = exit
main :: IO ()
main = do
args <- getArgs
+ logR <- initLogger
+ let log = logMessage logR
+ log "Starting up functorrent"
+ log $ "Parsing input file " ++ concat args
torrentStr <- parse args
- case Benc.decode torrentStr of
+ case decode torrentStr of
Right d ->
- case MInfo.mkMetaInfo d of
- Nothing -> putStrLn "parse error"
+ case mkMetaInfo d of
+ Nothing -> log "Unable to make meta info file"
Just m -> do
- let len = MInfo.lengthInBytes (MInfo.info m)
- body <- BC.pack <$> T.connect (MInfo.announce m) (T.prepareRequest d peerId len)
- print (P.getPeers (P.getPeerResponse body))
- Left e -> printError e
- putStrLn "done"
+ log "Input File OK"
+ log $ "Downloading file : " ++ name (info m)
+ log "Trying to fetch peers"
+
+ log $ "Trackers: " ++ head (announceList m)
+ response <- connect m peerId
+
+ let hsMsgLen = show $ length $ handShakeMsg m peerId
+ log $ "Hand-shake message length : " ++ hsMsgLen
+
+ -- TODO: Write to ~/.functorrent/caches
+ writeFile (name (info m) ++ ".cache") response
+
+ case decode response of
+ Right trackerInfo ->
+ case mkTrackerResponse trackerInfo of
+ Right peerResp ->
+ log $ "Peers List : " ++ (show . peers $ peerResp)
+ Left e -> log $ "Error" ++ unpack e
+ Left e -> logError e log
+
+ Left e -> logError e log
+ logStop logR