118 lines
3.5 KiB
Haskell
118 lines
3.5 KiB
Haskell
{- git-annex webapp launcher
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Command.WebApp where
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import Common.Annex
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import Command
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import Assistant
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import Assistant.DaemonStatus
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import Assistant.ScanRemotes
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import Assistant.TransferQueue
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import Assistant.Threads.WebApp
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import Utility.WebApp
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import Utility.Daemon (checkDaemon, lockPidFile)
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import Init
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import qualified Git.CurrentRepo
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import qualified Annex
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import Locations.UserConfig
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import System.Posix.Directory
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import Control.Concurrent
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import Control.Concurrent.STM
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def :: [Command]
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def = [oneShot $ noRepo startNoRepo $ dontCheck repoExists $
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command "webapp" paramNothing seek "launch webapp"]
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seek :: [CommandSeek]
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seek = [withNothing start]
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start :: CommandStart
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start = notBareRepo $ do
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ifM (isInitialized) ( go , liftIO startNoRepo )
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stop
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where
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go = do
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f <- liftIO . absPath =<< fromRepo gitAnnexHtmlShim
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ifM (checkpid <&&> checkshim f) $
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( liftIO $ openBrowser f
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, startDaemon True True $ Just $
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const openBrowser
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)
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checkpid = do
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pidfile <- fromRepo gitAnnexPidFile
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liftIO $ isJust <$> checkDaemon pidfile
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checkshim f = liftIO $ doesFileExist f
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{- When run without a repo, see if there is an autoStartFile,
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- and if so, start the first available listed repository.
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- If not, it's our first time being run! -}
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startNoRepo :: IO ()
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startNoRepo = do
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autostartfile <- autoStartFile
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ifM (doesFileExist autostartfile) ( autoStart autostartfile , firstRun )
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autoStart :: FilePath -> IO ()
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autoStart autostartfile = do
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dirs <- lines <$> readFile autostartfile
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edirs <- filterM doesDirectoryExist dirs
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case edirs of
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[] -> firstRun -- what else can I do? Nothing works..
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(d:_) -> do
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changeWorkingDirectory d
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state <- Annex.new =<< Git.CurrentRepo.get
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void $ Annex.eval state $ doCommand start
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{- Run the webapp without a repository, which prompts the user, makes one,
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- changes to it, starts the regular assistant, and redirects the
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- browser to its url.
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-
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- This is a very tricky dance -- The first webapp calls the signaler,
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- which signals the main thread when it's ok to continue by writing to a
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- MVar. The main thread starts the second webapp, and uses its callback
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- to write its url back to the MVar, from where the signaler retrieves it,
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- returning it to the first webapp, which does the redirect.
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-
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- Note that it's important that mainthread never terminates! Much
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- of this complication is due to needing to keep the mainthread running.
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-}
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firstRun :: IO ()
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firstRun = do
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dstatus <- atomically . newTMVar =<< newDaemonStatus
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scanremotes <- newScanRemoteMap
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transferqueue <- newTransferQueue
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v <- newEmptyMVar
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let callback a = Just $ a v
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webAppThread Nothing dstatus scanremotes transferqueue
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(callback signaler) (callback mainthread)
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where
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signaler v = do
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putMVar v ""
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takeMVar v
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mainthread v _url htmlshim = do
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openBrowser htmlshim
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_wait <- takeMVar v
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state <- Annex.new =<< Git.CurrentRepo.get
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Annex.eval state $ do
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dummydaemonize
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startAssistant True id $ Just $ sendurlback v
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sendurlback v url _htmlshim = putMVar v url
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{- Set up the pid file in the new repo. -}
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dummydaemonize = do
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liftIO . lockPidFile =<< fromRepo gitAnnexPidFile
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openBrowser :: FilePath -> IO ()
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openBrowser htmlshim = unlessM (runBrowser url) $
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error $ "failed to start web browser on url " ++ url
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where
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url = fileUrl htmlshim
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fileUrl :: FilePath -> String
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fileUrl file = "file://" ++ file
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