From db2a46723d2303093c2470f8409226051d69e3a3 Mon Sep 17 00:00:00 2001
From: Sam Truzjan <pxqr.sta@gmail.com>
Date: Tue, 4 Feb 2014 04:06:07 +0400
Subject: Add protocol independent tracker manager

---
 src/Network/BitTorrent/Tracker/RPC.hs | 142 ++++++++++++++++++++++++++++------
 1 file changed, 120 insertions(+), 22 deletions(-)

(limited to 'src/Network/BitTorrent/Tracker/RPC.hs')

diff --git a/src/Network/BitTorrent/Tracker/RPC.hs b/src/Network/BitTorrent/Tracker/RPC.hs
index 04dbec1b..3fe5157c 100644
--- a/src/Network/BitTorrent/Tracker/RPC.hs
+++ b/src/Network/BitTorrent/Tracker/RPC.hs
@@ -5,39 +5,137 @@
 --   Stability   :  experimental
 --   Portability :  portable
 --
+--   Protocol independent bittorrent tracker API.
+--
 module Network.BitTorrent.Tracker.RPC
-       ( Tracker
-       , Network.BitTorrent.Tracker.RPC.connect
-       , Network.BitTorrent.Tracker.RPC.announce
-       , Network.BitTorrent.Tracker.RPC.scrape
+       ( PeerInfo (..)
+
+         -- * Manager
+       , Options (..)
+       , Manager
+       , newManager
+       , closeManager
+       , withManager
+
+         -- * RPC
+       , announce
+       , scrape
        ) where
 
-import Control.Applicative
 import Control.Exception
 import Control.Monad.Trans.Resource
+import Data.Default
+import Network
 import Network.URI
+import Network.Socket (HostAddress)
+
+import           Data.Torrent.InfoHash
+import           Data.Torrent.Progress
+import           Network.BitTorrent.Core
+import           Network.BitTorrent.Tracker.Message
+import qualified Network.BitTorrent.Tracker.RPC.HTTP as HTTP
+import qualified Network.BitTorrent.Tracker.RPC.UDP  as UDP
+
+
+{-----------------------------------------------------------------------
+--  Simplified announce
+-----------------------------------------------------------------------}
+
+-- | Info to advertise to trackers.
+data PeerInfo = PeerInfo
+  { peerId   :: !PeerId
+  , peerPort :: !PortNumber
+  , peerIP   :: !(Maybe HostAddress)
+  } deriving (Show, Eq)
+
+-- | Simplified announce query.
+data SAnnounceQuery = SAnnounceQuery
+  { sInfoHash :: InfoHash
+  , sProgress :: Progress
+  , sNumWant  :: Maybe Int
+  , sEvent    :: Maybe Event
+  }
+
+fillAnnounceQuery :: PeerInfo  ->  SAnnounceQuery  ->    AnnounceQuery
+fillAnnounceQuery    PeerInfo{..} SAnnounceQuery {..} = AnnounceQuery
+  { reqInfoHash = sInfoHash
+  , reqPeerId   = peerId
+  , reqPort     = peerPort
+  , reqProgress = sProgress
+  , reqIP       = peerIP
+  , reqNumWant  = sNumWant
+  , reqEvent    = sEvent
+  }
 
-import Network.BitTorrent.Tracker.Message
-import Network.BitTorrent.Tracker.RPC.HTTP as HTTP
-import Network.BitTorrent.Tracker.RPC.UDP  as UDP
+{-----------------------------------------------------------------------
+--  RPC manager
+-----------------------------------------------------------------------}
 
+-- | Tracker manager settings.
+data Options = Options
+  { -- | HTTP tracker protocol specific options.
+    optHttpRPC      :: !HTTP.Options
 
-data Tracker
-  = HTracker Connection
-  | UTracker UDPTracker
+    -- | UDP tracker protocol specific options.
+  , optUdpRPC       :: !UDP.Options
 
-connect :: URI -> IO Tracker
-connect uri @ URI {..}
-  | uriScheme == "http:" = HTracker <$> runResourceT (HTTP.connect uri)
-  | uriScheme == "udp:"  = UTracker <$> UDP.connect uri
+    -- | Whether to use multitracker extension.
+  , optMultitracker :: !Bool
+  }
+
+instance Default Options where
+  def = Options
+    { optHttpRPC      = def
+    , optUdpRPC       = def
+    , optMultitracker = True
+    }
+
+-- | Tracker RPC Manager.
+data Manager  = Manager
+  { options  :: !Options
+  , peerInfo :: !PeerInfo
+  , httpMgr  :: !HTTP.Manager
+  , udpMgr   :: !UDP.Manager
+  }
+
+-- | Normally a bittorrent client session need a single RPC manager
+-- only.
+newManager :: Options -> PeerInfo -> IO Manager
+newManager opts info = do
+  h <- HTTP.newManager (optHttpRPC opts)
+  u <-  UDP.newManager (optUdpRPC  opts) `onException` HTTP.closeManager h
+  return $ Manager opts info h u
+
+closeManager :: Manager -> IO ()
+closeManager Manager {..} = do
+  UDP.closeManager udpMgr `finally` HTTP.closeManager httpMgr
+
+withManager :: Options -> PeerInfo -> (Manager -> IO a) -> IO a
+withManager opts info = bracket (newManager opts info) closeManager
+
+{-----------------------------------------------------------------------
+--  RPC calls
+-----------------------------------------------------------------------}
+-- TODO Catch IO exceptions on rpc calls.
+
+dispatch :: URI -> IO a -> IO a -> IO a
+dispatch URI {..} http udp
+  | uriScheme == "http:" = http
+  | uriScheme == "udp:"  = udp
   |       otherwise      = throwIO $ userError msg
   where
-    msg = "unknown tracker protocol scheme: " ++ show uriScheme
+    msg  = "unknown tracker protocol scheme: " ++ show uriScheme
 
-announce :: AnnounceQuery -> Tracker -> IO AnnounceInfo
-announce q (HTracker t) = runResourceT $ HTTP.announce q t
-announce q (UTracker t) = UDP.announce q t
+announce :: Manager -> URI -> SAnnounceQuery -> IO AnnounceInfo
+announce Manager {..} uri simpleQuery
+  = dispatch uri
+      (runResourceT (HTTP.announce httpMgr uri annQ))
+      (UDP.announce udpMgr uri annQ)
+  where
+    annQ = fillAnnounceQuery peerInfo simpleQuery
 
-scrape :: ScrapeQuery -> Tracker -> IO ScrapeInfo
-scrape q (HTracker t) = runResourceT $ HTTP.scrape q t
-scrape q (UTracker t) = UDP.scrape q t
+scrape :: Manager -> URI -> ScrapeQuery -> IO ScrapeInfo
+scrape Manager {..} uri q
+  = dispatch uri
+      (runResourceT (HTTP.scrape httpMgr uri q))
+      (UDP.scrape udpMgr uri q)
-- 
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