+{-
+ - 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
- (connect,
- infoHash,
- prepareRequest,
- urlEncodeHash
- ) where
-
-import Prelude hiding (lookup)
-import Crypto.Hash.SHA1 (hash)
-import Data.ByteString.Char8 (ByteString, pack, unpack)
-import Data.Char (chr)
-import Data.List (intercalate)
-import Data.Maybe (fromJust)
-import Data.Map as M (Map, (!))
-import Network.HTTP (simpleHTTP, defaultGETRequest_, getResponseBody)
-import Network.HTTP.Base (urlEncode)
-import Network.URI (parseURI)
-import qualified Data.ByteString.Base16 as B16 (encode)
-
-import FuncTorrent.Bencode (BVal(..), InfoDict, encode)
-import FuncTorrent.Utils (splitN)
-
-type Url = String
-
--- | urlEncodeHash
---
--- >>> urlEncodeHash $ pack "123456789abcdef123456789abcdef123456789a"
--- "%124Vx%9a%bc%de%f1%23Eg%89%ab%cd%ef%124Vx%9a"
-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'] ++ "-_.~"
-
-infoHash :: Map BVal BVal -> ByteString
-infoHash m = let info = m ! Bstr (pack "info")
- in (hash . pack . encode) info
-
-prepareRequest :: InfoDict -> String -> Integer -> String
-prepareRequest d peer_id len =
- let p = [("info_hash", urlEncodeHash ((B16.encode . infoHash) d)),
- ("peer_id", urlEncode peer_id),
- ("port", "6881"),
- ("uploaded", "0"),
- ("downloaded", "0"),
- ("left", show len),
- ("compact", "1"),
- ("event", "started")]
- in intercalate "&" [f ++ "=" ++ s | (f,s) <- p]
-
-connect :: Url -> String -> IO ByteString
-connect baseurl qstr = simpleHTTP (defaultGETRequest_ url) >>= getResponseBody
- where url = fromJust . parseURI $ (baseurl ++ "?" ++ qstr)
+ (runTracker
+ , getConnectedPeers
+ , newTracker
+ ) where
+
+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)
+import Data.List (isPrefixOf)
+import Network (PortNumber)
+
+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 qualified FuncTorrent.FileSystem as FS (MsgChannel)
+import FuncTorrent.PeerMsgs (Peer)
+
+type MsgChannel = Chan TrackerMsg
+
+newTracker :: IO MsgChannel
+newTracker = newChan
+
+runTracker :: MsgChannel -> FS.MsgChannel -> ByteString -> PortNumber
+ -> String -> [String] -> Integer -> IO ()
+runTracker msgChannel fsChan infohash port peerId announceList sz = do
+ let fn = getTrackerLoopFn turl
+ ps <- newEmptyMVar
+ _ <- forkIO $ fn turl port peerId infohash fsChan (initialTState ps)
+ _ <- runStateT (msgHandler msgChannel) (initialTState ps)
+ return ()
+ where getTrackerLoopFn turl' =
+ case getTrackerType turl' of
+ Http -> HT.trackerLoop
+ Udp -> UT.trackerLoop
+ _ -> error "Tracker Protocol unimplemented"
+ initialTState ps' = TState { currentState = None
+ , connectedPeers = ps'
+ , left = sz }
+ turl = head announceList
+
+getTrackerType :: String -> TrackerProtocol
+getTrackerType url | "http://" `isPrefixOf` url = Http
+ | "udp://" `isPrefixOf` url = Udp
+ | otherwise = UnknownProtocol
+
+
+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"
+
+getConnectedPeers :: MsgChannel -> IO [Peer]
+getConnectedPeers c = do
+ v <- newEmptyMVar
+ writeChan c (GetConnectedPeersMsg v)
+ readMVar v