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|
module Network.BitTorrent.Client.Handle
( -- * Handle
Handle
-- * Initialization
, openTorrent
, openMagnet
, closeHandle
-- * Control
, start
, pause
, stop
-- * Query
, getHandle
, HandleState
, getState
) where
import Control.Applicative
import Control.Concurrent
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
import Network.BitTorrent.DHT as DHT
import Network.BitTorrent.Exchange as Exchange
import Network.BitTorrent.Tracker as Tracker
{-----------------------------------------------------------------------
-- Safe handle set manupulation
-----------------------------------------------------------------------}
-- | Guarantees that we newer allocate the same handle twice.
allocHandle :: InfoHash -> BitTorrent Handle -> BitTorrent Handle
allocHandle ih m = do
c @ Client {..} <- getClient
liftIO $ modifyMVar clientTorrents $ \ handles -> do
case HM.lookup ih handles of
Just h -> return (handles, h)
Nothing -> do
h <- runBitTorrent c m
return (HM.insert ih h handles, h)
-- |
freeHandle :: InfoHash -> BitTorrent () -> BitTorrent ()
freeHandle ih finalizer = do
c @ Client {..} <- getClient
liftIO $ modifyMVar_ clientTorrents $ \ handles -> do
case HM.lookup ih handles of
Nothing -> return handles
Just _ -> do
runBitTorrent c finalizer
return (HM.delete ih handles)
-- |
lookupHandle :: InfoHash -> BitTorrent (Maybe Handle)
lookupHandle ih = do
Client {..} <- getClient
handles <- liftIO $ readMVar clientTorrents
return (HM.lookup ih handles)
{-----------------------------------------------------------------------
-- Initialization
-----------------------------------------------------------------------}
newExchangeSession :: FilePath -> InfoDict -> BitTorrent Exchange.Session
newExchangeSession rootPath dict = do
c @ Client {..} <- getClient
liftIO $ Exchange.newSession clientLogger (externalAddr c) rootPath dict
-- | 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
tses <- liftIO $ Tracker.newSession ih (trackerList t)
eses <- newExchangeSession rootPath tInfoDict
return $ Handle
{ handleTopic = ih
, handlePrivate = idPrivate tInfoDict
, handleTrackers = tses
, handleExchange = eses
}
-- | Use 'nullMagnet' to open handle from 'InfoHash'.
openMagnet :: FilePath -> Magnet -> BitTorrent Handle
openMagnet rootPath uri @ Magnet {..} = do
allocHandle exactTopic $ do
tses <- liftIO $ Tracker.newSession exactTopic def
eses <- newExchangeSession rootPath (error "openMagnet" exactTopic)
return $ Handle
{ handleTopic = exactTopic
, handlePrivate = False
, handleTrackers = tses
, handleExchange = eses
}
-- | 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
-----------------------------------------------------------------------}
-- | Start downloading, uploading and announcing this torrent.
--
-- This operation is blocking, use
-- 'Control.Concurrent.Async.Lifted.async' if needed.
start :: Handle -> BitTorrent ()
start Handle {..} = 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 Handle {..} = do
Client {..} <- getClient
unless handlePrivate $ do
liftDHT $ DHT.delete handleTopic (error "stop")
liftIO $ Tracker.notify trackerManager handleTrackers Tracker.Stopped
{-----------------------------------------------------------------------
-- Query
-----------------------------------------------------------------------}
data HandleState
= Running
| Paused
| Stopped
getHandle :: InfoHash -> BitTorrent Handle
getHandle ih = do
mhandle <- lookupHandle ih
case mhandle of
Nothing -> error "should we throw some exception?"
Just h -> return h
getState :: Handle -> IO HandleState
getState = undefined
|
