more p2p progress meters

Display progress meter on send and receive from remote.

Added a new hGetMetered that can read an exact number of bytes (or
less), updating a meter as it goes.

This commit was sponsored by Andreas on Patreon.

P2P/IO.hs

@@ -119,8 +119,8 @@ runNet conn runner f = case f of
 		case v of
 			Right True -> runner next
 			_ -> return Nothing
-	ReceiveBytes (Len n) next -> do
-		v <- liftIO $ tryNonAsync $ L.hGet (connIhdl conn) (fromIntegral n)
+	ReceiveBytes len p next -> do
+		v <- liftIO $ tryNonAsync $ receiveExactly len (connIhdl conn) p
 		case v of
 			Left _e -> return Nothing
 			Right b -> runner (next b)
@@ -155,9 +155,12 @@ runNet conn runner f = case f of
 -- If too few bytes are sent, the only option is to give up on this
 -- connection. False is returned to indicate this problem.
 sendExactly :: Len -> L.ByteString -> Handle -> MeterUpdate -> IO Bool
-sendExactly (Len l) b h p = do
-	sent <- meteredWrite' p h (L.take (fromIntegral l) b)
-	return (fromBytesProcessed sent == l)
+sendExactly (Len n) b h p = do
+	sent <- meteredWrite' p h (L.take (fromIntegral n) b)
+	return (fromBytesProcessed sent == n)
+
+receiveExactly :: Len -> Handle -> MeterUpdate -> IO L.ByteString
+receiveExactly (Len n) h p = hGetMetered h (Just n) p
 
 runRelay :: RunProto IO -> RelayHandle -> RelayHandle -> IO (Maybe ExitCode)
 runRelay runner (RelayHandle hout) (RelayHandle hin) = bracket setup cleanup go

P2P/Protocol.hs

@@ -167,7 +167,7 @@ data NetF c
 	| SendBytes Len L.ByteString MeterUpdate c
 	-- ^ Sends exactly Len bytes of data. (Any more or less will
 	-- confuse the receiver.)
-	| ReceiveBytes Len (L.ByteString -> c)
+	| ReceiveBytes Len MeterUpdate (L.ByteString -> c)
 	-- ^ Lazily reads bytes from peer. Stops once Len are read,
 	-- or if connection is lost, and in either case returns the bytes
 	-- that were read. This allows resuming interrupted transfers.
@@ -273,8 +273,8 @@ remove key = do
 	net $ sendMessage (REMOVE key)
 	checkSuccess
 
-get :: FilePath -> Key -> AssociatedFile -> Proto Bool
-get dest key af = receiveContent sizer storer (\offset -> GET offset af key)
+get :: FilePath -> Key -> AssociatedFile -> MeterUpdate -> Proto Bool
+get dest key af p = receiveContent p sizer storer (\offset -> GET offset af key)
   where
 	sizer = fileSize dest
 	storer = storeContentTo dest
@@ -364,7 +364,7 @@ serveAuthed myuuid = void $ serverLoop handler
 			else do
 				let sizer = tmpContentSize key
 				let storer = storeContent key af
-				ok <- receiveContent sizer storer PUT_FROM
+				ok <- receiveContent nullMeterUpdate sizer storer PUT_FROM
 				when ok $
 					local $ setPresent key myuuid
 		return ServerContinue
@@ -385,8 +385,8 @@ sendContent key af offset p = do
 	net $ sendBytes len content p
 	checkSuccess
 
-receiveContent :: Local Len -> (Offset -> Len -> L.ByteString -> Local Bool) -> (Offset -> Message) -> Proto Bool
-receiveContent sizer storer mkmsg = do
+receiveContent :: MeterUpdate -> Local Len -> (Offset -> Len -> L.ByteString -> Local Bool) -> (Offset -> Message) -> Proto Bool
+receiveContent p sizer storer mkmsg = do
 	Len n <- local sizer
 	let offset = Offset n
 	net $ sendMessage (mkmsg offset)
@@ -394,7 +394,7 @@ receiveContent sizer storer mkmsg = do
 	case r of
 		DATA len -> do
 			ok <- local . storer offset len
-				=<< net (receiveBytes len)
+				=<< net (receiveBytes len p)
 			sendSuccess ok
 			return ok
 		_ -> do
@@ -447,7 +447,7 @@ relayFromPeer = do
 	r <- receiveMessage
 	case r of
 		CONNECTDONE exitcode -> return $ RelayDone exitcode
-		DATA len -> RelayFromPeer <$> receiveBytes len
+		DATA len -> RelayFromPeer <$> receiveBytes len nullMeterUpdate
 		_ -> do
 			sendMessage $ ERROR "expected DATA or CONNECTDONE"
 			return $ RelayDone $ ExitFailure 1

Remote/P2P.hs

@@ -24,6 +24,7 @@ import Annex.UUID
 import Config
 import Config.Cost
 import Remote.Helper.Git
+import Messages.Progress
 import Utility.Metered
 import Utility.AuthToken
 import Types.NumCopies
@@ -74,12 +75,14 @@ chainGen addr r u c gc = do
 	return (Just this)
 
 store :: UUID -> P2PAddress -> ConnectionPool -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
-store u addr connpool k af p = fromMaybe False
-	<$> runProto u addr connpool (P2P.put k af p)
+store u addr connpool k af p = 
+	metered (Just p) k $ \p' -> fromMaybe False
+		<$> runProto u addr connpool (P2P.put k af p')
 
 retrieve :: UUID -> P2PAddress -> ConnectionPool -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex (Bool, Verification)
-retrieve u addr connpool k af dest _p = unVerified $ fromMaybe False 
-	<$> runProto u addr connpool (P2P.get dest k af)
+retrieve u addr connpool k af dest p = unVerified $ 
+	metered (Just p) k $ \p' -> fromMaybe False 
+		<$> runProto u addr connpool (P2P.get dest k af p')
 
 remove :: UUID -> P2PAddress -> ConnectionPool -> Key -> Annex Bool
 remove u addr connpool k = fromMaybe False

Remote/S3.hs

@@ -193,7 +193,7 @@ store _r info h = fileStorer $ \k f p -> do
 		uploadid <- S3.imurUploadId <$> sendS3Handle h startreq
 
 		-- The actual part size will be a even multiple of the
-		-- 32k chunk size that hGetUntilMetered uses.
+		-- 32k chunk size that lazy ByteStrings use.
 		let partsz' = (partsz `div` toInteger defaultChunkSize) * toInteger defaultChunkSize
 
 		-- Send parts of the file, taking care to stream each part

Utility/Metered.hs

@@ -1,6 +1,6 @@
 {- Metered IO and actions
  -
- - Copyright 2012-2106 Joey Hess <id@joeyh.name>
+ - Copyright 2012-2016 Joey Hess <id@joeyh.name>
  -
  - License: BSD-2-clause
  -}
@@ -115,24 +115,24 @@ offsetMeterUpdate base offset = \n -> base (offset `addBytesProcessed` n)
  - meter updates, so use caution.
  -}
 hGetContentsMetered :: Handle -> MeterUpdate -> IO L.ByteString
-hGetContentsMetered h = hGetUntilMetered h (const True)
+hGetContentsMetered h = hGetMetered h Nothing
 
-{- Reads from the Handle, updating the meter after each chunk.
+{- Reads from the Handle, updating the meter after each chunk is read.
+ -
+ - Stops at EOF, or when the requested number of bytes have been read.
+ - Closes the Handle at EOF, but otherwise leaves it open.
  -
  - Note that the meter update is run in unsafeInterleaveIO, which means that
  - it can be run at any time. It's even possible for updates to run out
  - of order, as different parts of the ByteString are consumed.
- -
- - Stops at EOF, or when keepgoing evaluates to False.
- - Closes the Handle at EOF, but otherwise leaves it open.
  -}
-hGetUntilMetered :: Handle -> (Integer -> Bool) -> MeterUpdate -> IO L.ByteString
-hGetUntilMetered h keepgoing meterupdate = lazyRead zeroBytesProcessed
+hGetMetered :: Handle -> Maybe Integer -> MeterUpdate -> IO L.ByteString
+hGetMetered h wantsize meterupdate = lazyRead zeroBytesProcessed
   where
 	lazyRead sofar = unsafeInterleaveIO $ loop sofar
 
 	loop sofar = do
-		c <- S.hGet h defaultChunkSize
+		c <- S.hGet h (nextchunksize (fromBytesProcessed sofar))
 		if S.null c
 			then do
 				hClose h
@@ -148,6 +148,18 @@ hGetUntilMetered h keepgoing meterupdate = lazyRead zeroBytesProcessed
 						cs <- lazyRead sofar'
 						return $ L.append (L.fromChunks [c]) cs
 					else return $ L.fromChunks [c]
+	
+	keepgoing n = case wantsize of
+		Nothing -> True
+		Just sz -> n < sz
+	
+	nextchunksize n = case wantsize of
+		Nothing -> defaultChunkSize
+		Just sz -> 
+			let togo = sz - n
+			in if togo < toInteger defaultChunkSize
+				then fromIntegral togo
+				else defaultChunkSize
 
 {- Same default chunk size Lazy ByteStrings use. -}
 defaultChunkSize :: Int