+{-
+ - Copyright (C) 2015-2016 Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
+ -
+ - This file is part of FuncTorrent.
+ -
+ - FuncTorrent is free software; you can redistribute it and/or modify
+ - it under the terms of the GNU General Public License as published by
+ - the Free Software Foundation; either version 3 of the License, or
+ - (at your option) any later version.
+ -
+ - FuncTorrent is distributed in the hope that it will be useful,
+ - but WITHOUT ANY WARRANTY; without even the implied warranty of
+ - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ - GNU General Public License for more details.
+ -
+ - You should have received a copy of the GNU General Public License
+ - along with FuncTorrent; if not, see <http://www.gnu.org/licenses/>
+ -}
+
{-# LANGUAGE OverloadedStrings #-}
module FuncTorrent.Tracker
- (TrackerResponse(..),
- mkArgs,
- getTrackerResponse,
- urlEncodeHash
- ) where
-
-import Prelude hiding (lookup, splitAt)
-
-import Data.ByteString (ByteString)
-import Data.ByteString.Char8 as BC (pack, unpack, splitAt)
-import Data.Char (chr)
-import Data.List (intercalate)
-import Data.Map as M (lookup)
-import Network.HTTP.Base (urlEncode)
-import qualified Data.ByteString.Base16 as B16 (encode)
-
-import FuncTorrent.Bencode (BVal(..), decode)
-import FuncTorrent.Metainfo (Info(..), Metainfo(..))
-import FuncTorrent.Network (get)
-import FuncTorrent.Peer (Peer(..))
-import FuncTorrent.Utils (splitN)
+ (runTracker
+ , getConnectedPeers
+ , newTracker
+ ) where
--- | Tracker response
-data TrackerResponse = TrackerResponse {
- interval :: Maybe Integer
- , peers :: [Peer]
- , complete :: Maybe Integer
- , incomplete :: Maybe Integer
- } deriving (Show, Eq)
+import Control.Concurrent(forkIO)
+import Control.Concurrent.Chan (Chan, newChan, readChan, writeChan)
+import Control.Concurrent.MVar (newEmptyMVar, putMVar, readMVar)
+import Control.Monad.State (StateT, liftIO, get, runStateT)
+import Control.Monad (forever)
+import Data.ByteString.Char8 (ByteString, pack, unpack)
+import Data.List (isPrefixOf)
+import Network (PortNumber)
--- | Deserialize tracker response
-mkTrackerResponse :: BVal -> Either ByteString TrackerResponse
-mkTrackerResponse resp =
- case lookup "failure reason" body of
- Just (Bstr err) -> Left err
- Just _ -> Left "Unknown failure"
- Nothing ->
- let (Just (Bint i)) = lookup "interval" body
- (Just (Bstr peersBS)) = lookup "peers" body
- pl = map makePeer (splitN 6 peersBS)
- in Right TrackerResponse {
- interval = Just i
- , peers = pl
- , complete = Nothing
- , incomplete = Nothing
- }
- where
- (Bdict body) = resp
-
- toInt :: String -> Integer
- toInt = read
+import qualified FuncTorrent.Tracker.Http as HT (trackerLoop)
+import qualified FuncTorrent.Tracker.Udp as UT (trackerLoop)
+import FuncTorrent.Tracker.Types (TState(..), TrackerEventState(..), TrackerProtocol(..), TrackerMsg(..))
+import FuncTorrent.Utils (Port, toPort, getHostname)
+import qualified FuncTorrent.FileSystem as FS (MsgChannel)
+import FuncTorrent.PeerMsgs (Peer)
- toPort :: ByteString -> Integer
- toPort = read . ("0x" ++) . unpack . B16.encode
+type MsgChannel = Chan TrackerMsg
- toIP :: ByteString -> String
- toIP = Data.List.intercalate "." .
- map (show . toInt . ("0x" ++) . unpack) .
- splitN 2 . B16.encode
+newTracker :: IO MsgChannel
+newTracker = newChan
- makePeer :: ByteString -> Peer
- makePeer peer = Peer "" (toIP ip') (toPort port')
- where (ip', port') = splitAt 4 peer
+runTracker :: MsgChannel -> FS.MsgChannel -> ByteString -> PortNumber
+ -> String -> [String] -> Integer -> IO ()
+runTracker msgChannel fsChan infohash port peerId announceList sz = do
+ ps <- newEmptyMVar
+ let initialTState = TState { currentState = None
+ , connectedPeers = ps
+ , left = sz }
+ turl = head announceList
+ host = getHostname turl
+ case getTrackerType turl of
+ Http -> do
+ _ <- forkIO $ HT.trackerLoop turl port peerId infohash fsChan initialTState
+ runStateT (msgHandler msgChannel) initialTState
+ return ()
+ Udp -> do
+ _ <- forkIO $ UT.trackerLoop turl (fromIntegral port) peerId infohash fsChan initialTState
+ runStateT (msgHandler msgChannel) initialTState
+ return ()
+ _ ->
+ error "Tracker Protocol unimplemented"
--- | Connect to a tracker and get peer info
-tracker :: String -> Metainfo -> IO ByteString
-tracker peer_id m = get (head . announceList $ m) $ mkArgs peer_id m
+getTrackerType :: String -> TrackerProtocol
+getTrackerType url | "http://" `isPrefixOf` url = Http
+ | "udp://" `isPrefixOf` url = Udp
+ | otherwise = UnknownProtocol
-getTrackerResponse :: String -> Metainfo -> IO (Either ByteString TrackerResponse)
-getTrackerResponse peerId m = do
- resp <- tracker peerId m
- case decode resp of
- Right trackerInfo -> return $ mkTrackerResponse trackerInfo
- Left e -> return $ Left (pack (show e))
---- | URL encode hash as per RFC1738
---- TODO: Add tests
---- REVIEW: Why is this not written in terms of `Network.HTTP.Base.urlEncode` or
---- equivalent library function?
-urlEncodeHash :: ByteString -> String
-urlEncodeHash bs = concatMap (encode' . unpack) (splitN 2 bs)
- where encode' b@[c1, c2] = let c = chr (read ("0x" ++ b))
- in escape c c1 c2
- encode' _ = ""
- escape i c1 c2 | i `elem` nonSpecialChars = [i]
- | otherwise = "%" ++ [c1] ++ [c2]
-
- nonSpecialChars = ['A'..'Z'] ++ ['a'..'z'] ++ ['0'..'9'] ++ "-_.~"
+msgHandler :: MsgChannel -> StateT TState IO ()
+msgHandler c = forever $ do
+ st <- get
+ peers <- liftIO $ readMVar (connectedPeers st)
+ msg <- liftIO recvMsg
+ liftIO $ sendResponse msg peers
+ where
+ recvMsg = readChan c
+ sendResponse msg peers =
+ case msg of
+ GetConnectedPeersMsg var ->
+ putMVar var peers
+ _ ->
+ putStrLn "Unhandled Tracker Msg"
--- | Make arguments that should be posted to tracker.
--- This is a separate pure function for testability.
-mkArgs :: String -> Metainfo -> [(String, ByteString)]
-mkArgs peer_id m = [("info_hash", pack . urlEncodeHash . B16.encode . infoHash $ m),
- ("peer_id", pack . urlEncode $ peer_id),
- ("port", "6881"),
- ("uploaded", "0"),
- ("downloaded", "0"),
- ("left", pack . show . lengthInBytes $ info m),
- ("compact", "1"),
- ("event", "started")]
+getConnectedPeers :: MsgChannel -> IO [Peer]
+getConnectedPeers c = do
+ v <- newEmptyMVar
+ writeChan c (GetConnectedPeersMsg v)
+ readMVar v
projects / functorrent.git / blobdiff