~ Move HTTP tracker stuff to its own module.

3 files changed, 120 insertions, 108 deletions

diff --git a/src/Network/BitTorrent/Tracker.hs b/src/Network/BitTorrent/Tracker.hs
index 5acaa3cc..75cbdf9b 100644
--- a/src/Network/BitTorrent/Tracker.hs
+++ b/src/Network/BitTorrent/Tracker.hs
@@ -30,11 +30,7 @@ module Network.BitTorrent.Tracker
 
          -- * Re-export
        , defaultPorts
-
-         -- * Scrape
-       , ScrapeInfo(..), Scrape
-       , scrapeURL
-       , scrape, scrapeOne
+       , ScrapeInfo
        ) where
 
 import Control.Applicative
@@ -61,9 +57,10 @@ import Network.HTTP
 import Network.URI
 
 import Data.Torrent
-import Network.BitTorrent.Sessions.Types
 import Network.BitTorrent.Peer
+import Network.BitTorrent.Sessions.Types
 import Network.BitTorrent.Tracker.Protocol
+import Network.BitTorrent.Tracker.HTTP
 
 {-----------------------------------------------------------------------
     Tracker connection
@@ -82,10 +79,10 @@ data TConnection = TConnection {
   , tconnPort     :: PortNumber -- ^ The port number the client is listenning on.
   } deriving Show
 
+-- TODO tconnection :: SwarmSession -> TConnection
 tconnection :: Torrent -> PeerId -> PortNumber -> TConnection
 tconnection t = TConnection (tAnnounce t) (tInfoHash t)
 
-
 -- | used to avoid boilerplate; do NOT export me
 genericReq :: TConnection -> Progress -> AnnounceQuery
 genericReq ses pr =   AnnounceQuery {
@@ -102,7 +99,6 @@ genericReq ses pr =   AnnounceQuery {
   , reqEvent      = Nothing
   }
 
-
 -- | The first request to the tracker that should be created is
 --   'startedReq'. It includes necessary 'Started' event field.
 --
@@ -251,59 +247,3 @@ withTracker initProgress conn action = bracket start end (action . fst)
       killThread tid
       pr <- getProgress se
       leaveTracker (tconnAnnounce conn) (stoppedReq conn pr)
-
-{-----------------------------------------------------------------------
-    Scrape
------------------------------------------------------------------------}
-
--- | Scrape info about a set of torrents.
-type Scrape = Map InfoHash ScrapeInfo
-
--- | Trying to convert /announce/ URL to /scrape/ URL. If 'scrapeURL'
---   gives 'Nothing' then tracker do not support scraping. The info hash
---   list is used to restrict the tracker's report to that particular
---   torrents. Note that scrapping of multiple torrents may not be
---   supported. (Even if scrapping convention is supported)
---
-scrapeURL :: URI -> [InfoHash] -> Maybe URI
-scrapeURL uri ihs = do
-  newPath <- replace (BC.pack (uriPath uri))
-  let newURI = uri { uriPath = BC.unpack newPath }
-  return (foldl addHashToURI newURI ihs)
- where
-    replace :: ByteString -> Maybe ByteString
-    replace p
-      | ps <- BC.splitWith (== '/') p
-      , "announce" `B.isPrefixOf` last ps
-      = let newSuff = "scrape" <> B.drop (B.length "announce") (last ps)
-        in Just (B.intercalate "/" (init ps ++ [newSuff]))
-      | otherwise = Nothing
-
-
--- | For each 'InfoHash' of torrents request scrape info from the tracker.
---   However if the info hash list is 'null', the tracker should list
---   all available torrents.
---   Note that the 'URI' should be /announce/ URI, not /scrape/ URI.
---
-scrape :: URI                -- ^ Announce 'URI'.
-       -> [InfoHash]         -- ^ Torrents to be scrapped.
-       -> IO (Result Scrape) -- ^ 'ScrapeInfo' for each torrent.
-scrape announce ihs
-  | Just uri<- scrapeURL announce ihs = do
-    rawResp  <- simpleHTTP (Request uri GET [] "")
-    respBody <- getResponseBody rawResp
-    return (decoded (BC.pack respBody))
-
-  | otherwise = return (Left "Tracker do not support scraping")
-
--- | More particular version of 'scrape', just for one torrent.
---
-scrapeOne :: URI                     -- ^ Announce 'URI'
-          -> InfoHash                -- ^ Hash of the torrent info.
-          -> IO (Result ScrapeInfo)  -- ^ 'ScrapeInfo' for the torrent.
-scrapeOne uri ih = extract <$> scrape uri [ih]
-  where
-    extract (Right m)
-      | Just s <- M.lookup ih m = Right s
-      | otherwise = Left "unable to find info hash in response dict"
-    extract (Left e) = Left e
diff --git a/src/Network/BitTorrent/Tracker/HTTP.hs b/src/Network/BitTorrent/Tracker/HTTP.hs
new file mode 100644
index 00000000..38388316
--- /dev/null
+++ b/src/Network/BitTorrent/Tracker/HTTP.hs
@@ -0,0 +1,115 @@
+{-# LANGUAGE OverloadedStrings #-}
+module Network.BitTorrent.Tracker.HTTP
+       ( askTracker, leaveTracker
+       , scrapeURL
+       ) where
+
+import Control.Applicative
+import Control.Monad
+import Data.BEncode
+import Data.ByteString as B
+import Data.ByteString.Char8 as BC
+import Data.List as L
+import Data.Map as M
+import Data.Monoid
+import Data.URLEncoded as URL
+import Network.URI
+import Network.HTTP
+
+import Data.Torrent
+import Network.BitTorrent.Tracker.Protocol
+
+{-----------------------------------------------------------------------
+  Announce
+-----------------------------------------------------------------------}
+
+encodeRequest :: URI -> AnnounceQuery -> URI
+encodeRequest announce req = URL.urlEncode req
+                    `addToURI`      announce
+                    `addHashToURI`  reqInfoHash req
+
+mkHTTPRequest :: URI -> Request ByteString
+mkHTTPRequest uri = Request uri GET [] ""
+
+-- TODO rename to something like "announceBlahBlah"
+
+-- | Send request and receive response from the tracker specified in
+-- announce list. This function throws 'IOException' if it couldn't
+-- send request or receive response or decode response.
+--
+askTracker :: URI -> AnnounceQuery -> IO AnnounceInfo
+askTracker announce req = do
+    let r = mkHTTPRequest (encodeRequest announce req)
+
+    rawResp  <- simpleHTTP r
+    respBody <- getResponseBody rawResp
+    checkResult $ decoded respBody
+  where
+    checkResult (Left err)
+      = ioError $ userError $ err ++ " in tracker response"
+    checkResult (Right (Failure err))
+      = ioError $ userError $ show err ++ " in tracker response"
+    checkResult (Right resp)          = return resp
+
+-- | The same as the 'askTracker' but ignore response. Used in
+-- conjunction with 'Stopped'.
+leaveTracker :: URI -> AnnounceQuery -> IO ()
+leaveTracker announce req = do
+  let r = mkHTTPRequest (encodeRequest announce req)
+  void $ simpleHTTP r >>= getResponseBody
+
+{-----------------------------------------------------------------------
+  Scrape
+-----------------------------------------------------------------------}
+
+-- | Scrape info about a set of torrents.
+type Scrape = Map InfoHash ScrapeInfo
+
+-- | Trying to convert /announce/ URL to /scrape/ URL. If 'scrapeURL'
+--   gives 'Nothing' then tracker do not support scraping. The info hash
+--   list is used to restrict the tracker's report to that particular
+--   torrents. Note that scrapping of multiple torrents may not be
+--   supported. (Even if scrapping convention is supported)
+--
+scrapeURL :: URI -> [InfoHash] -> Maybe URI
+scrapeURL uri ihs = do
+  newPath <- replace (BC.pack (uriPath uri))
+  let newURI = uri { uriPath = BC.unpack newPath }
+  return (L.foldl addHashToURI newURI ihs)
+ where
+    replace :: ByteString -> Maybe ByteString
+    replace p
+      | ps <- BC.splitWith (== '/') p
+      , "announce" `B.isPrefixOf` L.last ps
+      = let newSuff = "scrape" <> B.drop (B.length "announce") (L.last ps)
+        in Just (B.intercalate "/" (L.init ps ++ [newSuff]))
+      | otherwise = Nothing
+
+
+-- | For each 'InfoHash' of torrents request scrape info from the tracker.
+--   However if the info hash list is 'null', the tracker should list
+--   all available torrents.
+--   Note that the 'URI' should be /announce/ URI, not /scrape/ URI.
+--
+scrape :: URI                -- ^ Announce 'URI'.
+       -> [InfoHash]         -- ^ Torrents to be scrapped.
+       -> IO (Result Scrape) -- ^ 'ScrapeInfo' for each torrent.
+scrape announce ihs
+  | Just uri<- scrapeURL announce ihs = do
+    rawResp  <- simpleHTTP (Request uri GET [] "")
+    respBody <- getResponseBody rawResp
+    return (decoded (BC.pack respBody))
+
+  | otherwise = return (Left "Tracker do not support scraping")
+
+-- | More particular version of 'scrape', just for one torrent.
+--
+scrapeOne :: URI                     -- ^ Announce 'URI'
+          -> InfoHash                -- ^ Hash of the torrent info.
+          -> IO (Result ScrapeInfo)  -- ^ 'ScrapeInfo' for the torrent.
+scrapeOne uri ih = extract <$> scrape uri [ih]
+  where
+    extract (Right m)
+      | Just s <- M.lookup ih m = Right s
+      | otherwise = Left "unable to find info hash in response dict"
+    extract (Left e) = Left e
diff --git a/src/Network/BitTorrent/Tracker/Protocol.hs b/src/Network/BitTorrent/Tracker/Protocol.hs
index 5ee61185..f5898d36 100644
--- a/src/Network/BitTorrent/Tracker/Protocol.hs
+++ b/src/Network/BitTorrent/Tracker/Protocol.hs
@@ -25,11 +25,8 @@
 {-# LANGUAGE TemplateHaskell            #-}
 module Network.BitTorrent.Tracker.Protocol
        ( Event(..), AnnounceQuery(..), AnnounceInfo(..)
+       , defaultNumWant , defaultPorts
        , ScrapeQuery, ScrapeInfo(..)
-       , askTracker, leaveTracker
-
-         -- * Defaults
-       , defaultPorts, defaultNumWant
        )
        where
 
@@ -44,7 +41,6 @@ import Data.List as L
 import Data.Word
 import Data.Monoid
 import Data.BEncode
-import Data.ByteString as B
 import Data.Text (Text)
 import Data.Text.Encoding
 import Data.Serialize hiding (Result)
@@ -53,7 +49,6 @@ import Data.Torrent
 
 import Network
 import Network.Socket
-import Network.HTTP
 import Network.URI
 
 import Network.BitTorrent.Peer
@@ -216,11 +211,6 @@ instance URLEncode AnnounceQuery where
       ]
     where s :: String -> String;  s = id; {-# INLINE s #-}
 
-encodeRequest :: URI -> AnnounceQuery -> URI
-encodeRequest announce req = URL.urlEncode req
-                    `addToURI`      announce
-                    `addHashToURI`  reqInfoHash req
-
 {-----------------------------------------------------------------------
   Binary announce encoding
 -----------------------------------------------------------------------}
@@ -369,36 +359,3 @@ instance Serialize ScrapeInfo where
       , siIncomplete = fromIntegral leechers
       , siName       = Nothing
       }
-
-{-----------------------------------------------------------------------
-  Tracker
------------------------------------------------------------------------}
-
-mkHTTPRequest :: URI -> Request ByteString
-mkHTTPRequest uri = Request uri GET [] ""
-
--- | Send request and receive response from the tracker specified in
--- announce list. This function throws 'IOException' if it couldn't
--- send request or receive response or decode response.
---
-askTracker :: URI -> AnnounceQuery -> IO AnnounceInfo
-askTracker announce req = do
-    let r = mkHTTPRequest (encodeRequest announce req)
-
-    rawResp  <- simpleHTTP r
-    respBody <- getResponseBody rawResp
-    checkResult $ decoded respBody
-  where
-
-    checkResult (Left err)
-      = ioError $ userError $ err ++ " in tracker response"
-    checkResult (Right (Failure err))
-      = ioError $ userError $ show err ++ " in tracker response"
-    checkResult (Right resp)          = return resp
-
--- | The same as the 'askTracker' but ignore response. Used in
--- conjunction with 'Stopped'.
-leaveTracker :: URI -> AnnounceQuery -> IO ()
-leaveTracker announce req = do
-  let r = mkHTTPRequest (encodeRequest announce req)
-  void $ simpleHTTP r >>= getResponseBody