forked from filipg/gonito
249 lines
8.2 KiB
Haskell
249 lines
8.2 KiB
Haskell
{-# LANGUAGE RecordWildCards #-}
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module Handler.Shared where
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import Import
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import Control.Concurrent.STM
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import Data.IntMap (IntMap)
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import qualified Data.IntMap as IntMap
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import Network.URI
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import qualified Data.Text as T
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import Database.Persist.Sql (ConnectionPool, runSqlPool, fromSqlKey)
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import Control.Concurrent.Lifted (fork, threadDelay)
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import qualified Crypto.Hash.SHA1 as CHS
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import System.Process
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import System.Exit
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import System.Random
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import System.Directory (renameDirectory)
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import PersistSHA1
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import qualified Data.ByteString as BS
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atom = Control.Concurrent.STM.atomically
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type Channel = TChan (Maybe Text)
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arena :: FilePath
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arena = "arena"
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gitPath :: FilePath
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gitPath = "/usr/bin/git"
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runViewProgress :: (Channel -> Handler ()) -> Handler TypedContent
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runViewProgress action = do
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App {..} <- getYesod
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jobId <- randomInt
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chan <- liftIO $ atom $ do
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chan <- newBroadcastTChan
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m <- readTVar jobs
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writeTVar jobs $ IntMap.insert jobId chan m
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return chan
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fork $ do
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liftIO $ threadDelay 1000000
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action chan
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liftIO $ atom $ do
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writeTChan chan $ Just "All done\n"
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writeTChan chan Nothing
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m <- readTVar jobs
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writeTVar jobs $ IntMap.delete jobId m
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redirect $ ViewProgressR jobId
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msg :: Channel -> Text -> Handler ()
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msg chan m = liftIO $ atom $ writeTChan chan $ Just (m ++ "\n")
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err :: Channel -> Text -> Handler ()
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err = msg
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raw :: Channel -> Text -> Handler ()
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raw = msg
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doRepoCloning :: Text -> Text -> Channel -> Handler ()
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doRepoCloning url branch chan = do
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msg chan "Did something"
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_ <- cloneRepo url branch chan
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return ()
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validGitProtocols :: [String]
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validGitProtocols = ["git", "http", "https", "ssh"]
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validGitProtocolsAsText :: Text
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validGitProtocolsAsText = T.pack $ intercalate ", " $ map (++"://") validGitProtocols
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cloneRepo :: Text -> Text -> Channel -> Handler (Maybe (Key Repo))
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cloneRepo url branch chan = do
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maybeRepo <- runDB $ getBy $ UniqueUrlBranch url branch
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case maybeRepo of
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Just _ -> do
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err chan "Repo already there"
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return Nothing
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Nothing -> cloneRepo' url branch chan
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updateRepo :: Key Repo -> Channel -> Handler Bool
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updateRepo repoId chan = do
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repo <- runDB $ get404 repoId
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let repoDir = getRepoDir repoId
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(exitCode, _) <- runProgram (Just repoDir) gitPath ["pull", "--progress"] chan
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case exitCode of
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ExitSuccess -> do
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maybeHeadCommit <- getHeadCommit repoDir chan
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case maybeHeadCommit of
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Just headCommit -> do
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runDB $ update repoId [RepoCurrentCommit =. headCommit]
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return True
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Nothing -> return False
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getHeadCommit :: FilePath -> Channel -> Handler (Maybe SHA1)
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getHeadCommit repoDir chan = do
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(exitCode, out) <- runProgram (Just repoDir) gitPath ["rev-parse", "HEAD"] chan
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case exitCode of
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ExitSuccess -> do
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msg chan $ concat ["HEAD commit is ", commitId]
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return $ Just commitRaw
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where commitId = T.replace "\n" "" out
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commitRaw = fromTextToSHA1 commitId
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ExitFailure _ -> do
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err chan "cannot determine HEAD commit"
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return Nothing
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cloneRepo' :: Text -> Text -> Channel -> Handler (Maybe (Key Repo))
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cloneRepo' url branch chan = do
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msg chan $ concat ["Preparing to clone repo ", url]
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if checkRepoUrl url
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then do
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msg chan "Cloning..."
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r <- randomInt
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let tmpRepoDir = arena </> ("t" ++ show r)
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(exitCode, _) <- runProgram Nothing gitPath ["clone",
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"--progress",
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"--branch",
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T.unpack branch,
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T.unpack url,
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tmpRepoDir] chan
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case exitCode of
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ExitSuccess -> do
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maybeHeadCommit <- getHeadCommit tmpRepoDir chan
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case maybeHeadCommit of
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Just commitRaw -> do
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userId <- requireAuthId
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time <- liftIO getCurrentTime
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repoId <- runDB $ insert $ Repo {
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repoUrl=url,
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repoBranch=branch,
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repoCurrentCommit=commitRaw,
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repoOwner=userId,
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repoReady=True,
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repoStamp=time }
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let repoDir = getRepoDir repoId
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liftIO $ renameDirectory tmpRepoDir repoDir
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msg chan $ concat ["Repo is in ", (T.pack repoDir)]
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return $ Just repoId
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Nothing -> do
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return Nothing
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ExitFailure _ -> do
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err chan "git failed"
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return Nothing
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else do
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err chan $ concat ["Wrong URL to a Git repo (note that one of the following protocols must be specified: ", validGitProtocolsAsText]
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return Nothing
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getRepoDir :: Key Repo -> FilePath
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getRepoDir repoId = arena </> ("r" ++ repoIdAsString)
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where repoIdAsString = show $ fromSqlKey repoId
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checkRepoUrl :: Text -> Bool
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checkRepoUrl url = case parsedURI of
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Just uri -> (uriScheme uri) `elem` (map (++":") validGitProtocols)
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Nothing -> False
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where parsedURI = parseURI $ T.unpack url
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getViewProgressR :: Int -> Handler TypedContent
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getViewProgressR jobId = do
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App {..} <- getYesod
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mchan <- liftIO $ atom $ do
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m <- readTVar jobs
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case IntMap.lookup jobId m of
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Nothing -> return Nothing
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Just chan -> fmap Just $ dupTChan chan
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case mchan of
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Nothing -> notFound
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Just chan -> respondSource typePlain $ do
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let loop = do
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mtext <- liftIO $ atom $ readTChan chan
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case mtext of
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Nothing -> return ()
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Just text -> do
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sendChunkText text
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sendFlush
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loop
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loop
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runProgram :: Maybe FilePath -> FilePath -> [String] -> Channel -> Handler (ExitCode, Text)
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runProgram workingDir programPath args chan = do
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(_, Just hout, Just herr, pid) <-
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liftIO $ createProcess (proc programPath args){ std_out = CreatePipe,
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std_err = CreatePipe,
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cwd = workingDir}
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(code, out) <- gatherOutput pid hout herr chan
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_ <- liftIO $ waitForProcess pid
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return (code, out)
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processOutput :: Text -> ([Text], Text)
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processOutput = processOutput' . lines
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where processOutput' [] = ([], "")
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processOutput' out = (init out, last out)
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init [] = []
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init [x] = []
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init (x:xs) = (x:(init xs))
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last [x] = x
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last (_:xs) = last xs
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gatherOutput :: ProcessHandle -> Handle -> Handle -> Channel -> Handler (ExitCode, Text)
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gatherOutput ph hout herr chan = work mempty mempty
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where
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work accout accerr = do
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-- Read any outstanding input.
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resterr <- takeABit herr accerr
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restout <- takeABit hout accout
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threadDelay 1000000
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-- Check on the process.
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s <- liftIO $ getProcessExitCode ph
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-- Exit or loop.
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case s of
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Nothing -> work restout resterr
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Just ec -> do
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-- Get any last bit written between the read and the status
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-- check.
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_ <- takeFinalBit herr resterr
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all <- takeFinalBit hout restout
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return (ec, all)
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takeABit h acc = do
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bs <- liftIO $ BS.hGetNonBlocking hout (64 * 1024)
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let acc' = acc <> (decodeUtf8 bs)
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let (fullLines, rest) = processOutput acc'
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mapM_ (msg chan) fullLines
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return rest
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takeFinalBit h rest = do
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last <- liftIO $ BS.hGetContents h
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let all = rest <> (decodeUtf8 last)
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mapM_ (msg chan) $ lines all
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return all
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randomInt :: Handler Int
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randomInt = liftIO $ randomIO
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gatherSHA1ForCollectionOfFiles :: [FilePath] -> IO ByteString
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gatherSHA1ForCollectionOfFiles files = do
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contentss <- mapM readFile $ sort files
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return $ CHS.finalize $ foldl' CHS.update CHS.init contentss
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