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|
module Network.BitTorrent.Client.Handle
( -- * Handle
Handle
-- * Initialization
, openTorrent
, openMagnet
, closeHandle
-- * Control
, start
, pause
, stop
-- * Query
, getHandle
, getStatus
) where
import Control.Concurrent.Chan.Split
import Control.Concurrent.Lifted as L
import Control.Monad
import Control.Monad.Trans
import Data.Default
import Data.List as L
import Data.HashMap.Strict as HM
import Data.Torrent
import Data.Torrent.InfoHash
import Data.Torrent.Magnet
import Network.BitTorrent.Client.Types as Types
import Network.BitTorrent.DHT as DHT
import Network.BitTorrent.Exchange as Exchange
import Network.BitTorrent.Tracker as Tracker
{-----------------------------------------------------------------------
-- Safe handle set manupulation
-----------------------------------------------------------------------}
allocHandle :: InfoHash -> BitTorrent Handle -> BitTorrent Handle
allocHandle ih m = do
Client {..} <- getClient
(h, added) <- modifyMVar clientTorrents $ \ handles -> do
case HM.lookup ih handles of
Just h -> return (handles, (h, False))
Nothing -> do
h <- m
return (HM.insert ih h handles, (h, True))
when added $ do
liftIO $ send clientEvents (TorrentAdded ih)
return h
freeHandle :: InfoHash -> BitTorrent () -> BitTorrent ()
freeHandle ih finalizer = do
Client {..} <- getClient
modifyMVar_ clientTorrents $ \ handles -> do
case HM.lookup ih handles of
Nothing -> return handles
Just _ -> do
finalizer
return (HM.delete ih handles)
lookupHandle :: InfoHash -> BitTorrent (Maybe Handle)
lookupHandle ih = do
Client {..} <- getClient
handles <- readMVar clientTorrents
return (HM.lookup ih handles)
{-----------------------------------------------------------------------
-- Initialization
-----------------------------------------------------------------------}
newExchangeSession :: FilePath -> Either InfoHash InfoDict -> BitTorrent Exchange.Session
newExchangeSession rootPath source = do
c @ Client {..} <- getClient
liftIO $ Exchange.newSession clientLogger (externalAddr c) rootPath source
-- | Open a torrent in 'stop'ed state. Use 'nullTorrent' to open
-- handle from 'InfoDict'. This operation do not block.
openTorrent :: FilePath -> Torrent -> BitTorrent Handle
openTorrent rootPath t @ Torrent {..} = do
let ih = idInfoHash tInfoDict
allocHandle ih $ do
statusVar <- newMVar Types.Stopped
tses <- liftIO $ Tracker.newSession ih (trackerList t)
eses <- newExchangeSession rootPath (Right tInfoDict)
eventStream <- liftIO newSendPort
return $ Handle
{ handleTopic = ih
, handlePrivate = idPrivate tInfoDict
, handleStatus = statusVar
, handleTrackers = tses
, handleExchange = eses
, handleEvents = eventStream
}
-- | Use 'nullMagnet' to open handle from 'InfoHash'.
openMagnet :: FilePath -> Magnet -> BitTorrent Handle
openMagnet rootPath Magnet {..} = do
allocHandle exactTopic $ do
statusVar <- newMVar Types.Stopped
tses <- liftIO $ Tracker.newSession exactTopic def
eses <- newExchangeSession rootPath (Left exactTopic)
eventStream <- liftIO newSendPort
return $ Handle
{ handleTopic = exactTopic
, handlePrivate = False
, handleStatus = statusVar
, handleTrackers = tses
, handleExchange = eses
, handleEvents = eventStream
}
-- | Stop torrent and destroy all sessions. You don't need to close
-- handles at application exit, all handles will be automatically
-- closed at 'Network.BitTorrent.Client.closeClient'. This operation
-- may block.
closeHandle :: Handle -> BitTorrent ()
closeHandle h @ Handle {..} = do
freeHandle handleTopic $ do
Client {..} <- getClient
stop h
liftIO $ Exchange.closeSession handleExchange
liftIO $ Tracker.closeSession trackerManager handleTrackers
{-----------------------------------------------------------------------
-- Control
-----------------------------------------------------------------------}
modifyStatus :: HandleStatus -> Handle -> (HandleStatus -> BitTorrent ()) -> BitTorrent ()
modifyStatus targetStatus Handle {..} targetAction = do
modifyMVar_ handleStatus $ \ actualStatus -> do
unless (actualStatus == targetStatus) $ do
targetAction actualStatus
return targetStatus
liftIO $ send handleEvents (StatusChanged targetStatus)
-- | Start downloading, uploading and announcing this torrent.
--
-- This operation is blocking, use
-- 'Control.Concurrent.Async.Lifted.async' if needed.
start :: Handle -> BitTorrent ()
start h @ Handle {..} = do
modifyStatus Types.Running h $ \ status -> do
case status of
Types.Running -> return ()
Types.Stopped -> do
Client {..} <- getClient
liftIO $ Tracker.notify trackerManager handleTrackers Tracker.Started
unless handlePrivate $ do
liftDHT $ DHT.insert handleTopic (error "start")
liftIO $ do
peers <- askPeers trackerManager handleTrackers
print $ "got: " ++ show (L.length peers) ++ " peers"
forM_ peers $ \ peer -> do
Exchange.connect peer handleExchange
-- | Stop downloading this torrent.
pause :: Handle -> BitTorrent ()
pause _ = return ()
-- | Stop downloading, uploading and announcing this torrent.
stop :: Handle -> BitTorrent ()
stop h @ Handle {..} = do
modifyStatus Types.Stopped h $ \ status -> do
case status of
Types.Stopped -> return ()
Types.Running -> do
Client {..} <- getClient
unless handlePrivate $ do
liftDHT $ DHT.delete handleTopic (error "stop")
liftIO $ Tracker.notify trackerManager handleTrackers Tracker.Stopped
{-----------------------------------------------------------------------
-- Query
-----------------------------------------------------------------------}
getHandle :: InfoHash -> BitTorrent Handle
getHandle ih = do
mhandle <- lookupHandle ih
case mhandle of
Nothing -> error "should we throw some exception?"
Just h -> return h
getStatus :: Handle -> IO HandleStatus
getStatus Handle {..} = readMVar handleStatus
|
