X-Git-Url: https://git.rkrishnan.org/?a=blobdiff_plain;f=src%2FFuncTorrent%2FTracker.hs;h=8090feb99ea868eb328dc1811332b550984e277c;hb=9beb0fb9814b33725f6adfa5adabb3225a54277b;hp=a2dc48b65b46e10e0f93af76b2b7a5114dbab49a;hpb=721aeee745cc308014b80594b4c6b7b403d4ef1f;p=functorrent.git

diff --git a/src/FuncTorrent/Tracker.hs b/src/FuncTorrent/Tracker.hs
index a2dc48b..8090feb 100644
--- a/src/FuncTorrent/Tracker.hs
+++ b/src/FuncTorrent/Tracker.hs
@@ -1,103 +1,94 @@
+{-
+ - 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(..),
-     getTrackerResponse
-    ) 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)
-
--- | Tracker response
-data TrackerResponse = TrackerResponse {
-      interval :: Maybe Integer
-    , peers :: [Peer]
-    , complete :: Maybe Integer
-    , incomplete :: Maybe Integer
-    } deriving (Show, Eq)
-
--- | 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
-                 }
+       (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, pack, unpack)
+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 FuncTorrent.Utils (Port, toPort, getHostname)
+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
+  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"
+
+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
-      (Bdict body) = resp
-
-      toInt :: String -> Integer
-      toInt = read
-
-      toPort :: ByteString -> Integer
-      toPort = read . ("0x" ++) . unpack . B16.encode
-
-      toIP :: ByteString -> String
-      toIP = Data.List.intercalate "." .
-             map (show . toInt . ("0x" ++) . unpack) .
-                 splitN 2 . B16.encode
-
-      makePeer :: ByteString -> Peer
-      makePeer peer = Peer "" (toIP ip') (toPort port')
-          where (ip', port') = splitAt 4 peer
-
--- | Connect to a tracker and get peer info
-tracker :: String -> Metainfo -> IO ByteString
-tracker peer_id m = do
-  get (head . announceList $ m) $ mkArgs peer_id m
-
-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'] ++ "-_.~"
-
--- | 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")]
-
-
+      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