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-rw-r--r--bittorrent/src/System/Torrent/FileMap.hs163
-rw-r--r--bittorrent/src/System/Torrent/Storage.hs221
-rw-r--r--bittorrent/src/System/Torrent/Tree.hs83
3 files changed, 0 insertions, 467 deletions
diff --git a/bittorrent/src/System/Torrent/FileMap.hs b/bittorrent/src/System/Torrent/FileMap.hs
deleted file mode 100644
index 38c475e8..00000000
--- a/bittorrent/src/System/Torrent/FileMap.hs
+++ /dev/null
@@ -1,163 +0,0 @@
1{-# LANGUAGE RecordWildCards #-}
2{-# LANGUAGE ViewPatterns #-}
3{-# OPTIONS -fno-warn-orphans #-}
4module System.Torrent.FileMap
5 ( FileMap
6
7 -- * Construction
8 , Mode (..)
9 , def
10 , mmapFiles
11 , unmapFiles
12
13 -- * Query
14 , System.Torrent.FileMap.size
15
16 -- * Modification
17 , readBytes
18 , writeBytes
19 , unsafeReadBytes
20
21 -- * Unsafe conversions
22 , fromLazyByteString
23 , toLazyByteString
24 ) where
25
26import Control.Applicative
27import Control.Monad as L
28import Data.ByteString as BS
29import Data.ByteString.Internal as BS
30import Data.ByteString.Lazy as BL
31import Data.ByteString.Lazy.Internal as BL
32import Data.Default
33import Data.Vector as V -- TODO use unboxed vector
34import Foreign
35import System.IO.MMap
36
37import Data.Torrent
38
39
40data FileEntry = FileEntry
41 { filePosition :: {-# UNPACK #-} !FileOffset
42 , fileBytes :: {-# UNPACK #-} !BS.ByteString -- XXX: mutable buffer (see 'writeBytes').
43 } deriving (Show, Eq)
44
45type FileMap = Vector FileEntry
46
47instance Default Mode where
48 def = ReadWriteEx
49
50mmapFiles :: Mode -> FileLayout FileSize -> IO FileMap
51mmapFiles mode layout = V.fromList <$> L.mapM mkEntry (accumPositions layout)
52 where
53 mkEntry (path, (pos, expectedSize)) = do
54 let esize = fromIntegral expectedSize -- FIXME does this safe?
55 (fptr, moff, msize) <- mmapFileForeignPtr path mode $ Just (0, esize)
56 if msize /= esize
57 then error "mmapFiles" -- TODO unmap mapped files on exception
58 else return $ FileEntry pos (PS fptr moff msize)
59
60unmapFiles :: FileMap -> IO ()
61unmapFiles = V.mapM_ unmapEntry
62 where
63 unmapEntry (FileEntry _ (PS fptr _ _)) = finalizeForeignPtr fptr
64
65-- Unsafe: FileMap 'writeBytes' will modify supplied bytestrings in place.
66fromLazyByteString :: BL.ByteString -> FileMap
67fromLazyByteString lbs = V.unfoldr f (0, lbs)
68 where
69 f (_, Empty ) = Nothing
70 f (pos, Chunk x xs) = Just (FileEntry pos x, ((pos + chunkSize), xs))
71 where chunkSize = fromIntegral $ BS.length x
72
73-- | /O(n)/.
74--
75-- Unsafe: mutable buffers are returned without copy.
76toLazyByteString :: FileMap -> BL.ByteString
77toLazyByteString = V.foldr f Empty
78 where
79 f FileEntry {..} bs = Chunk fileBytes bs
80
81-- | /O(1)/.
82size :: FileMap -> FileOffset
83size m
84 | V.null m = 0
85 | FileEntry {..} <- V.unsafeLast m
86 = filePosition + fromIntegral (BS.length fileBytes)
87
88-- | Find the file number for a particular byte offset within a torrent.
89bsearch :: FileOffset -> FileMap -> Maybe Int
90bsearch x m
91 | V.null m = Nothing
92 | otherwise = branch (V.length m `div` 2)
93 where
94 branch c @ ((m !) -> FileEntry {..})
95 | x < filePosition = bsearch x (V.take c m)
96 | x >= filePosition + fileSize = do
97 ix <- bsearch x (V.drop (succ c) m)
98 return $ succ c + ix
99 | otherwise = Just c
100 where
101 fileSize = fromIntegral (BS.length fileBytes)
102
103-- | /O(log n)/.
104drop :: FileOffset -> FileMap -> (FileSize, FileMap)
105drop off m
106 | Just ix <- bsearch off m
107 , FileEntry {..} <- m ! ix = (off - filePosition, V.drop ix m)
108 | otherwise = (0 , V.empty)
109
110-- | /O(log n)/.
111take :: FileSize -> FileMap -> (FileMap, FileSize)
112take len m
113 | len >= s = (m , 0)
114 | Just ix <- bsearch (pred len) m = let m' = V.take (succ ix) m
115 in (m', System.Torrent.FileMap.size m' - len)
116 | otherwise = (V.empty , 0)
117 where
118 s = System.Torrent.FileMap.size m
119
120-- | /O(log n + m)/. Do not use this function with 'unmapFiles'.
121--
122-- The returned bytestring points directly into an area memory mapped from a
123-- file.
124unsafeReadBytes :: FileOffset -> FileSize -> FileMap -> BL.ByteString
125unsafeReadBytes off s m
126 | (l , m') <- System.Torrent.FileMap.drop off m
127 , (m'', _ ) <- System.Torrent.FileMap.take (off + s) m'
128 = BL.take (fromIntegral s) $ BL.drop (fromIntegral l) $ toLazyByteString m''
129
130-- The returned bytestring is copied and safe to use after the file is
131-- unmapped.
132readBytes :: FileOffset -> FileSize -> FileMap -> IO BL.ByteString
133readBytes off s m = do
134 let bs_copy = BL.copy $ unsafeReadBytes off s m
135 forceLBS bs_copy
136 return bs_copy
137 where
138 forceLBS Empty = return ()
139 forceLBS (Chunk _ x) = forceLBS x
140
141-- UNSAFE: Uses the first byte string as a pointer to mutable data and writes
142-- the contents of the second bytestring there.
143bscpy :: BL.ByteString -> BL.ByteString -> IO ()
144bscpy (PS _ _ 0 `Chunk` dest_rest) src = bscpy dest_rest src
145bscpy dest (PS _ _ 0 `Chunk` src_rest) = bscpy dest src_rest
146bscpy (PS dest_fptr dest_off dest_size `Chunk` dest_rest)
147 (PS src_fptr src_off src_size `Chunk` src_rest)
148 = do let csize = min dest_size src_size
149 withForeignPtr dest_fptr $ \dest_ptr ->
150 withForeignPtr src_fptr $ \src_ptr ->
151 memcpy (dest_ptr `advancePtr` dest_off)
152 (src_ptr `advancePtr` src_off)
153 (fromIntegral csize) -- TODO memmove?
154 bscpy (PS dest_fptr (dest_off + csize) (dest_size - csize) `Chunk` dest_rest)
155 (PS src_fptr (src_off + csize) (src_size - csize) `Chunk` src_rest)
156bscpy _ _ = return ()
157
158-- UNSAFE: Mutates bytestring contents within the provided FileMap.
159writeBytes :: FileOffset -> BL.ByteString -> FileMap -> IO ()
160writeBytes off lbs m = bscpy dest src
161 where
162 src = BL.take (fromIntegral (BL.length dest)) lbs
163 dest = unsafeReadBytes off (fromIntegral (BL.length lbs)) m
diff --git a/bittorrent/src/System/Torrent/Storage.hs b/bittorrent/src/System/Torrent/Storage.hs
deleted file mode 100644
index 1d77e55d..00000000
--- a/bittorrent/src/System/Torrent/Storage.hs
+++ /dev/null
@@ -1,221 +0,0 @@
1-- |
2-- Copyright : (c) Sam Truzjan 2013
3-- License : BSD3
4-- Maintainer : pxqr.sta@gmail.com
5-- Stability : experimental
6-- Portability : portable
7--
8-- This module implements mapping from single continious piece space
9-- to file storage. Storage can be used in two modes:
10--
11-- * As in memory storage - in this case we don't touch filesystem.
12--
13-- * As ordinary mmaped file storage - when we need to store
14-- data in the filesystem.
15--
16{-# LANGUAGE RecordWildCards #-}
17{-# LANGUAGE DeriveDataTypeable #-}
18module System.Torrent.Storage
19 ( -- * Storage
20 Storage
21 , StorageFailure (..)
22
23 -- * Construction
24 , Mode (..)
25 , def
26 , open
27 , openInfoDict
28 , close
29 , withStorage
30
31 -- * Query
32 , totalPieces
33 , verifyPiece
34 , genPieceInfo
35 , getBitfield
36
37 -- * Modification
38 , writePiece
39 , readPiece
40 , hintRead
41 , unsafeReadPiece
42
43 -- * Streaming
44 , sourceStorage
45 , sinkStorage
46 ) where
47
48import Control.Applicative
49import Control.Exception
50import Control.Monad as M
51import Control.Monad.Trans
52import Data.ByteString.Lazy as BL
53import Data.Conduit as C
54import Data.Conduit.Binary as C
55import Data.Conduit.List as C
56import Data.Typeable
57
58import Data.Torrent
59import Network.BitTorrent.Exchange.Bitfield as BF
60import System.Torrent.FileMap as FM
61
62
63-- | Some storage operations may throw an exception if misused.
64data StorageFailure
65 -- | Occurs on a write operation if the storage has been opened
66 -- using 'ReadOnly' mode.
67 = StorageIsRO
68
69 -- | Piece index is out of bounds.
70 | InvalidIndex PieceIx
71
72 -- | Piece size do not match with one passed to the 'open'
73 -- function.
74 | InvalidSize PieceSize
75 deriving (Show, Eq, Typeable)
76
77instance Exception StorageFailure
78
79-- | Pieces store.
80data Storage = Storage
81 { mode :: !Mode
82 , pieceLen :: {-# UNPACK #-} !PieceSize
83 , fileMap :: {-# UNPACK #-} !FileMap
84 }
85
86-- | Map torrent files:
87--
88-- * when torrent first created use 'ReadWriteEx' mode;
89--
90-- * when seeding, validation 'ReadOnly' mode.
91--
92open :: Mode -> PieceSize -> FileLayout FileSize -> IO Storage
93open mode s l
94 | s <= 0 = throwIO (InvalidSize s)
95 | otherwise = Storage mode s <$> mmapFiles mode l
96
97-- | Like 'open', but use 'InfoDict' file layout.
98openInfoDict :: Mode -> FilePath -> InfoDict -> IO Storage
99openInfoDict mode rootPath InfoDict {..} =
100 open mode (piPieceLength idPieceInfo) (flatLayout rootPath idLayoutInfo)
101
102-- | Unmaps all files forcefully. It is recommended but not required.
103close :: Storage -> IO ()
104close Storage {..} = unmapFiles fileMap
105
106-- | Normally you need to use 'Control.Monad.Trans.Resource.allocate'.
107withStorage :: Mode -> PieceSize -> FileLayout FileSize
108 -> (Storage -> IO ()) -> IO ()
109withStorage m s l = bracket (open m s l) close
110
111-- TODO allocateStorage?
112
113-- | Count of pieces in the storage.
114totalPieces :: Storage -> PieceCount
115totalPieces Storage {..} = FM.size fileMap `sizeInBase` pieceLen
116
117isValidIx :: PieceIx -> Storage -> Bool
118isValidIx i s = 0 <= i && i < totalPieces s
119
120-- | Put piece data at the piece index by overwriting existing
121-- data.
122--
123-- This operation may throw 'StorageFailure'.
124--
125writePiece :: Piece BL.ByteString -> Storage -> IO ()
126writePiece p @ Piece {..} s @ Storage {..}
127 | mode == ReadOnly = throwIO StorageIsRO
128 | isNotValidIx pieceIndex = throwIO (InvalidIndex pieceIndex)
129 | isNotValidSize pieceIndex (pieceSize p)
130 = throwIO (InvalidSize (pieceSize p))
131 | otherwise = writeBytes offset pieceData fileMap
132 where
133 isNotValidSize pix psize
134 | succ pix == pcount = psize /= lastPieceLen -- last piece may be shorter
135 | otherwise = psize /= pieceLen
136 where
137 lastPieceLen = fromIntegral (FM.size fileMap `rem` fromIntegral pieceLen)
138 {-# INLINE isNotValidSize #-}
139
140 isNotValidIx i = i < 0 || i >= pcount
141 {-# INLINE isNotValidIx #-}
142
143 pcount = totalPieces s
144 offset = fromIntegral pieceIndex * fromIntegral pieceLen
145
146-- | Read specific piece from storage.
147--
148-- This operation may throw 'StorageFailure'.
149--
150readPiece :: PieceIx -> Storage -> IO (Piece BL.ByteString)
151readPiece pix s @ Storage {..}
152 | not (isValidIx pix s) = throwIO (InvalidIndex pix)
153 | otherwise = Piece pix <$> readBytes offset sz fileMap
154 where
155 offset = fromIntegral pix * fromIntegral pieceLen
156 sz = fromIntegral pieceLen
157
158-- | Hint about the coming 'readPiece'. Ignores invalid indexes, for e.g.:
159--
160-- @forall s. hindRead (-1) s == return ()@
161--
162hintRead :: PieceIx -> Storage -> IO ()
163hintRead _pix Storage {..} = return ()
164
165-- | Zero-copy version of readPiece. Can be used only with 'ReadOnly'
166-- storages.
167unsafeReadPiece :: PieceIx -> Storage -> IO (Piece BL.ByteString)
168unsafeReadPiece pix s @ Storage {..}
169 | not (isValidIx pix s) = throwIO (InvalidIndex pix)
170 | otherwise = return $ Piece pix (unsafeReadBytes offset sz fileMap)
171 where
172 offset = fromIntegral pix * fromIntegral pieceLen
173 sz = fromIntegral pieceLen
174
175-- | Stream storage pieces from first to the last.
176sourceStorage :: Storage -> Source IO (Piece BL.ByteString)
177sourceStorage s = go 0
178 where
179 go pix
180 | pix < totalPieces s = do
181 piece <- liftIO $ readPiece pix s
182 liftIO $ hintRead (succ pix) s
183 yield piece
184 go (succ pix)
185 | otherwise = return ()
186
187-- | Write stream of pieces to the storage. Fail if storage is 'ReadOnly'.
188sinkStorage :: Storage -> Sink (Piece BL.ByteString) IO ()
189sinkStorage s = do
190 awaitForever $ \ piece ->
191 liftIO $ writePiece piece s
192
193-- | This function can be used to generate 'InfoDict' from a set of
194-- opened files.
195genPieceInfo :: Storage -> IO PieceInfo
196genPieceInfo s = do
197 hashes <- sourceStorage s $= C.map hashPiece $$ C.sinkLbs
198 return $ PieceInfo (pieceLen s) (HashList (BL.toStrict hashes))
199
200-- | Verify specific piece using infodict hash list.
201verifyPiece :: Storage -> PieceInfo -> PieceIx -> IO Bool
202verifyPiece s pinfo pix = do
203 piece <- unsafeReadPiece pix s
204 return $! checkPieceLazy pinfo piece
205
206-- | Verify storage.
207--
208-- Throws 'InvalidSize' if piece info size do not match with storage
209-- piece size.
210--
211getBitfield :: Storage -> PieceInfo -> IO Bitfield
212getBitfield s @ Storage {..} pinfo @ PieceInfo {..}
213 | pieceLen /= piPieceLength = throwIO (InvalidSize piPieceLength)
214 | otherwise = M.foldM checkPiece (BF.haveNone total) [0..total - 1]
215 where
216 total = totalPieces s
217
218 checkPiece :: Bitfield -> PieceIx -> IO Bitfield
219 checkPiece bf pix = do
220 valid <- verifyPiece s pinfo pix
221 return $ if valid then BF.insert pix bf else bf
diff --git a/bittorrent/src/System/Torrent/Tree.hs b/bittorrent/src/System/Torrent/Tree.hs
deleted file mode 100644
index 41cfb360..00000000
--- a/bittorrent/src/System/Torrent/Tree.hs
+++ /dev/null
@@ -1,83 +0,0 @@
1-- |
2-- Copyright : (c) Sam Truzjan 2013
3-- License : BSD3
4-- Maintainer : pxqr.sta@gmail.com
5-- Stability : experimental
6-- Portability : portable
7--
8-- Directory tree can be used to easily manipulate file layout info.
9--
10{-# LANGUAGE FlexibleInstances #-}
11{-# LANGUAGE TemplateHaskell #-}
12{-# LANGUAGE DeriveDataTypeable #-}
13module System.Torrent.Tree
14 ( -- * Directory tree
15 DirTree (..)
16
17 -- * Construction
18 , build
19
20 -- * Query
21 , System.Torrent.Tree.lookup
22 , lookupDir
23 , fileNumber
24 , dirNumber
25 ) where
26
27import Data.ByteString as BS
28import Data.ByteString.Char8 as BC
29import Data.Foldable
30import Data.List as L
31import Data.Map as M
32import Data.Monoid
33
34import Data.Torrent
35
36
37-- | 'DirTree' is more convenient form of 'LayoutInfo'.
38data DirTree a = Dir { children :: Map ByteString (DirTree a) }
39 | File { node :: FileInfo a }
40 deriving Show
41
42-- | Build directory tree from a list of files.
43build :: LayoutInfo -> DirTree ()
44build SingleFile {liFile = FileInfo {..}} = Dir
45 { children = M.singleton fiName (File fi) }
46 where
47 fi = FileInfo fiLength fiMD5Sum ()
48build MultiFile {..} = Dir $ M.singleton liDirName files
49 where
50 files = Dir $ M.fromList $ L.map mkFileEntry liFiles
51 mkFileEntry FileInfo {..} = (L.head fiName, ent) -- TODO FIXME
52 where
53 ent = File $ FileInfo fiLength fiMD5Sum ()
54
55--decompress :: DirTree () -> [FileInfo ()]
56--decompress = undefined
57
58-- TODO pretty print
59
60-- | Lookup file by path.
61lookup :: [FilePath] -> DirTree a -> Maybe (DirTree a)
62lookup [] t = Just t
63lookup (p : ps) (Dir m) | Just subTree <- M.lookup (BC.pack p) m
64 = System.Torrent.Tree.lookup ps subTree
65lookup _ _ = Nothing
66
67-- | Lookup directory by path.
68lookupDir :: [FilePath] -> DirTree a -> Maybe [(ByteString, DirTree a)]
69lookupDir ps d = do
70 subTree <- System.Torrent.Tree.lookup ps d
71 case subTree of
72 File _ -> Nothing
73 Dir es -> Just $ M.toList es
74
75-- | Get total count of files in directory and subdirectories.
76fileNumber :: DirTree a -> Sum Int
77fileNumber File {..} = Sum 1
78fileNumber Dir {..} = foldMap fileNumber children
79
80-- | Get total count of directories in the directory and subdirectories.
81dirNumber :: DirTree a -> Sum Int
82dirNumber File {..} = Sum 0
83dirNumber Dir {..} = Sum 1 <> foldMap dirNumber children
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 14:25:19 +0000