queue Uploads of newly added files to remotes

Added knownRemotes to DaemonStatus. This list is not entirely trivial to
calculate, and having it here should make it easier to add/remove remotes
on the fly later on. It did require plumbing the daemonstatus through to
some more threads.

Assistant.hs

@@ -21,7 +21,8 @@
  -	until this is complete.
  - Thread 5: committer
  - 	Waits for changes to occur, and runs the git queue to update its
- - 	index, then commits.
+ - 	index, then commits. Also queues Transfer events to send added
+ - 	files to other remotes.
  - Thread 6: pusher
  - 	Waits for commits to be made, and pushes updated branches to remotes,
  - 	in parallel. (Forks a process for each git push.)
@@ -73,6 +74,7 @@ import Assistant.DaemonStatus
 import Assistant.Changes
 import Assistant.Commits
 import Assistant.Pushes
+import Assistant.TransferQueue
 import Assistant.Threads.Watcher
 import Assistant.Threads.Committer
 import Assistant.Threads.Pusher
@@ -103,9 +105,10 @@ startDaemon assistant foreground
 			changechan <- newChangeChan
 			commitchan <- newCommitChan
 			pushmap <- newFailedPushMap
+			transferqueue <- newTransferQueue
 			mapM_ (void . forkIO)
-				[ commitThread st changechan commitchan
-				, pushThread st commitchan pushmap
+				[ commitThread st changechan commitchan transferqueue dstatus
+				, pushThread st dstatus commitchan pushmap
 				, pushRetryThread st pushmap
 				, mergeThread st
 				, transferWatcherThread st dstatus

Assistant/DaemonStatus.hs

@@ -11,13 +11,14 @@ import Common.Annex
 import Assistant.ThreadedMonad
 import Utility.ThreadScheduler
 import Utility.TempFile
+import Logs.Transfer
+import qualified Command.Sync
 
 import Control.Concurrent
 import System.Posix.Types
 import Data.Time.Clock.POSIX
 import Data.Time
 import System.Locale
-import Logs.Transfer
 import qualified Data.Map as M
 
 data DaemonStatus = DaemonStatus
@@ -31,6 +32,8 @@ data DaemonStatus = DaemonStatus
 	, lastSanityCheck :: Maybe POSIXTime
 	-- Currently running file content transfers
 	, currentTransfers :: M.Map Transfer TransferInfo
+	-- Ordered list of remotes to talk to.
+	, knownRemotes :: [Remote]
 	}
 	deriving (Show)
 
@@ -43,6 +46,7 @@ newDaemonStatus = DaemonStatus
 	, sanityCheckRunning = False
 	, lastSanityCheck = Nothing
 	, currentTransfers = M.empty
+	, knownRemotes = []
 	}
 
 getDaemonStatus :: DaemonStatusHandle -> Annex DaemonStatus
@@ -59,10 +63,12 @@ startDaemonStatus = do
 	status <- liftIO $
 		catchDefaultIO (readDaemonStatusFile file) newDaemonStatus
 	transfers <- M.fromList <$> getTransfers
+	remotes <- Command.Sync.syncRemotes []
 	liftIO $ newMVar status
 		{ scanComplete = False
 		, sanityCheckRunning = False
 		, currentTransfers = transfers
+		, knownRemotes = remotes
 		}
 
 {- This thread wakes up periodically and writes the daemon status to disk. -}

Assistant/Threads/Committer.hs

@@ -12,6 +12,9 @@ import Assistant.Changes
 import Assistant.Commits
 import Assistant.ThreadedMonad
 import Assistant.Threads.Watcher
+import Assistant.TransferQueue
+import Assistant.DaemonStatus
+import Logs.Transfer
 import qualified Annex
 import qualified Annex.Queue
 import qualified Git.Command
@@ -29,8 +32,8 @@ import qualified Data.Set as S
 import Data.Either
 
 {- This thread makes git commits at appropriate times. -}
-commitThread :: ThreadState -> ChangeChan -> CommitChan -> IO ()
-commitThread st changechan commitchan = runEvery (Seconds 1) $ do
+commitThread :: ThreadState -> ChangeChan -> CommitChan -> TransferQueue -> DaemonStatusHandle -> IO ()
+commitThread st changechan commitchan transferqueue dstatus = runEvery (Seconds 1) $ do
 	-- We already waited one second as a simple rate limiter.
 	-- Next, wait until at least one change is available for
 	-- processing.
@@ -39,7 +42,7 @@ commitThread st changechan commitchan = runEvery (Seconds 1) $ do
 	time <- getCurrentTime
 	if shouldCommit time changes
 		then do
-			readychanges <- handleAdds st changechan changes
+			readychanges <- handleAdds st changechan transferqueue dstatus changes
 			if shouldCommit time readychanges
 				then do
 					void $ tryIO $ runThreadState st commitStaged
@@ -97,8 +100,8 @@ shouldCommit now changes
  - Any pending adds that are not ready yet are put back into the ChangeChan,
  - where they will be retried later.
  -}
-handleAdds :: ThreadState -> ChangeChan -> [Change] -> IO [Change]
-handleAdds st changechan cs = returnWhen (null pendingadds) $ do
+handleAdds :: ThreadState -> ChangeChan -> TransferQueue -> DaemonStatusHandle -> [Change] -> IO [Change]
+handleAdds st changechan transferqueue dstatus cs = returnWhen (null pendingadds) $ do
 	(postponed, toadd) <- partitionEithers <$>
 		safeToAdd st pendingadds
 
@@ -110,7 +113,7 @@ handleAdds st changechan cs = returnWhen (null pendingadds) $ do
 		if (DirWatcher.eventsCoalesce || null added)
 			then return $ added ++ otherchanges
 			else do
-				r <- handleAdds st changechan
+				r <- handleAdds st changechan transferqueue dstatus
 					=<< getChanges changechan
 				return $ r ++ added ++ otherchanges
 	where
@@ -121,12 +124,12 @@ handleAdds st changechan cs = returnWhen (null pendingadds) $ do
 			| otherwise = a
 
 		add :: Change -> IO (Maybe Change)
-		add change@(PendingAddChange { keySource = ks }) = do
-			r <- catchMaybeIO $ sanitycheck ks $ runThreadState st $ do
-				showStart "add" $ keyFilename ks
-				handle (finishedChange change) (keyFilename ks)
-					=<< Command.Add.ingest ks
-			return $ maybeMaybe r
+		add change@(PendingAddChange { keySource = ks }) =
+			liftM maybeMaybe $ catchMaybeIO $
+				sanitycheck ks $ runThreadState st $ do
+					showStart "add" $ keyFilename ks
+					key <- Command.Add.ingest ks
+					handle (finishedChange change) (keyFilename ks) key
 		add _ = return Nothing
 
 		maybeMaybe (Just j@(Just _)) = j
@@ -141,6 +144,7 @@ handleAdds st changechan cs = returnWhen (null pendingadds) $ do
 				sha <- inRepo $
 					Git.HashObject.hashObject BlobObject link
 				stageSymlink file sha
+			queueTransfers transferqueue dstatus key (Just file) Upload
 			showEndOk
 			return $ Just change
 

Assistant/Threads/Pusher.hs

@@ -10,6 +10,7 @@ module Assistant.Threads.Pusher where
 import Common.Annex
 import Assistant.Commits
 import Assistant.Pushes
+import Assistant.DaemonStatus
 import Assistant.ThreadedMonad
 import Assistant.Threads.Merger
 import qualified Command.Sync
@@ -32,9 +33,8 @@ pushRetryThread st pushmap = runEvery (Seconds halfhour) $ do
 		halfhour = 1800
 
 {- This thread pushes git commits out to remotes soon after they are made. -}
-pushThread :: ThreadState -> CommitChan -> FailedPushMap -> IO ()
-pushThread st commitchan pushmap = do
-	remotes <- runThreadState st $ Command.Sync.syncRemotes []
+pushThread :: ThreadState -> DaemonStatusHandle -> CommitChan -> FailedPushMap -> IO ()
+pushThread st daemonstatus commitchan pushmap = do
 	runEvery (Seconds 2) $ do
 		-- We already waited two seconds as a simple rate limiter.
 		-- Next, wait until at least one commit has been made
@@ -42,7 +42,10 @@ pushThread st commitchan pushmap = do
 		-- Now see if now's a good time to push.
 		now <- getCurrentTime
 		if shouldPush now commits
-			then pushToRemotes now st pushmap remotes
+			then do
+				remotes <- runThreadState st $
+					knownRemotes <$> getDaemonStatus daemonstatus
+				pushToRemotes now st pushmap remotes
 			else refillCommits commitchan commits
 
 {- Decide if now is a good time to push to remotes.

Assistant/TransferQueue.hs

@@ -8,9 +8,10 @@
 module Assistant.TransferQueue where
 
 import Common.Annex
-import Utility.TSet
+import Assistant.DaemonStatus
 import Logs.Transfer
 import Types.Remote
+import qualified Remote
 
 import Control.Concurrent.STM
 
@@ -28,15 +29,29 @@ stubInfo f = TransferInfo
 	, associatedFile = f
 	}
 
+{- Adds pending transfers to the end of the queue for some of the known
+ - remotes. (TBD: a smaller set of remotes that are sufficient to transfer to,
+ - rather than transferring to all.) -}
+queueTransfers :: TransferQueue -> DaemonStatusHandle -> Key -> AssociatedFile -> Direction -> Annex ()
+queueTransfers q daemonstatus k f direction =
+	mapM_ (liftIO . queueTransfer q f . gentransfer)
+		=<< knownRemotes <$> getDaemonStatus daemonstatus
+	where
+		gentransfer r = Transfer
+			{ transferDirection = direction
+			, transferKey = k
+			, transferRemote = Remote.uuid r
+			}
+
 {- Adds a pending transfer to the end of the queue. -}
-queueTransfer :: TransferQueue -> Transfer -> AssociatedFile -> IO ()
-queueTransfer q transfer f = void $ atomically $
-	writeTChan q (transfer, stubInfo f)
+queueTransfer :: TransferQueue -> AssociatedFile -> Transfer -> IO ()
+queueTransfer q f t = void $ atomically $
+	writeTChan q (t, stubInfo f)
 
 {- Adds a pending transfer to the start of the queue, to be processed next. -}
-queueNextTransfer :: TransferQueue -> Transfer -> AssociatedFile -> IO ()
-queueNextTransfer q transfer f = void $ atomically $
-	unGetTChan q (transfer, stubInfo f)
+queueNextTransfer :: TransferQueue -> AssociatedFile -> Transfer -> IO ()
+queueNextTransfer q f t = void $ atomically $
+	unGetTChan q (t, stubInfo f)
 
 {- Blocks until a pending transfer is available in the queue. -}
 getNextTransfer :: TransferQueue -> IO (Transfer, TransferInfo)