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|
module Job (
Job(..),
JobOutput(..),
JobName(..), stringJobName, textJobName,
ArtifactName(..),
JobStatus(..),
jobStatusFinished, jobStatusFailed,
runJobs,
) where
import Control.Concurrent
import Control.Concurrent.STM
import Control.Monad
import Control.Monad.Catch
import Control.Monad.Except
import Data.List
import Data.Text (Text)
import Data.Text qualified as T
import Data.Text.IO qualified as T
import System.Directory
import System.Exit
import System.FilePath
import System.IO
import System.Process
data Job = Job
{ jobName :: JobName
, jobRecipe :: [CreateProcess]
, jobArtifacts :: [(ArtifactName, CreateProcess)]
, jobUses :: [(JobName, ArtifactName)]
}
data JobOutput = JobOutput
{ outName :: JobName
, outArtifacts :: [ArtifactOutput]
}
deriving (Eq)
data JobName = JobName Text
deriving (Eq, Ord, Show)
stringJobName :: JobName -> String
stringJobName (JobName name) = T.unpack name
textJobName :: JobName -> Text
textJobName (JobName name) = name
data ArtifactName = ArtifactName Text
deriving (Eq, Ord, Show)
data ArtifactOutput = ArtifactOutput
{ aoutName :: ArtifactName
, aoutWorkPath :: FilePath
, aoutStorePath :: FilePath
}
deriving (Eq)
data JobStatus a = JobQueued
| JobWaiting [JobName]
| JobRunning
| JobSkipped
| JobError Text
| JobFailed
| JobDone a
deriving (Eq)
jobStatusFinished :: JobStatus a -> Bool
jobStatusFinished = \case
JobQueued {} -> False
JobWaiting {} -> False
JobRunning {} -> False
_ -> True
jobStatusFailed :: JobStatus a -> Bool
jobStatusFailed = \case
JobError {} -> True
JobFailed {} -> True
_ -> False
textJobStatus :: JobStatus a -> Text
textJobStatus = \case
JobQueued -> "queued"
JobWaiting _ -> "waiting"
JobRunning -> "running"
JobSkipped -> "skipped"
JobError err -> "error\n" <> err
JobFailed -> "failed"
JobDone _ -> "done"
runJobs :: FilePath -> String -> [Job] -> IO [TVar (JobStatus JobOutput)]
runJobs dir cid jobs = do
results <- forM jobs $ \job -> (job,) <$> newTVarIO JobQueued
gitLock <- newMVar ()
forM_ results $ \(job, outVar) -> void $ forkIO $ do
res <- runExceptT $ do
uses <- waitForUsedArtifacts job results outVar
liftIO $ atomically $ writeTVar outVar JobRunning
prepareJob gitLock dir cid job $ \checkoutPath jdir -> do
updateStatusFile (jdir </> "status") outVar
runJob job uses checkoutPath jdir
case res of
Left (JobError err) -> T.putStrLn err
_ -> return ()
atomically $ writeTVar outVar $ either id JobDone res
return $ map snd results
waitForUsedArtifacts :: (MonadIO m, MonadError (JobStatus JobOutput) m) =>
Job -> [(Job, TVar (JobStatus JobOutput))] -> TVar (JobStatus JobOutput) -> m [ArtifactOutput]
waitForUsedArtifacts job results outVar = do
ujobs <- forM (jobUses job) $ \(ujobName@(JobName tjobName), uartName) -> do
case find ((==ujobName) . jobName . fst) results of
Just (_, var) -> return (var, (ujobName, uartName))
Nothing -> throwError $ JobError $ "Job '" <> tjobName <> "' not found"
let loop prev = do
ustatuses <- atomically $ do
ustatuses <- forM ujobs $ \(uoutVar, uartName) -> do
(,uartName) <$> readTVar uoutVar
when (Just (map fst ustatuses) == prev) retry
writeTVar outVar $ JobWaiting $ map (fst . snd) $ filter (not . jobStatusFinished . fst) ustatuses
return ustatuses
if all (jobStatusFinished . fst) ustatuses
then return ustatuses
else loop $ Just $ map fst ustatuses
ustatuses <- liftIO $ loop Nothing
forM ustatuses $ \(ustatus, (JobName tjobName, uartName@(ArtifactName tartName))) -> do
case ustatus of
JobDone out -> case find ((==uartName) . aoutName) $ outArtifacts out of
Just art -> return art
Nothing -> throwError $ JobError $ "Artifact '" <> tjobName <> "." <> tartName <> "' not found"
_ -> throwError JobSkipped
updateStatusFile :: MonadIO m => FilePath -> TVar (JobStatus JobOutput) -> m ()
updateStatusFile path outVar = void $ liftIO $ forkIO $ loop Nothing
where
loop prev = do
status <- atomically $ do
status <- readTVar outVar
when (Just status == prev) retry
return status
T.writeFile path $ textJobStatus status <> "\n"
when (not (jobStatusFinished status)) $ loop $ Just status
prepareJob :: (MonadIO m, MonadMask m, MonadFail m) => MVar () -> FilePath -> String -> Job -> (FilePath -> FilePath -> m a) -> m a
prepareJob gitLock dir cid job inner = do
[checkoutPath] <- fmap lines $ liftIO $
readProcess "mktemp" ["-d", "-t", "minici.XXXXXXXXXX"] ""
flip finally (liftIO $ removeDirectoryRecursive checkoutPath) $ do
tid <- liftIO $ withMVar gitLock $ \_ -> do
"" <- readProcess "git" ["--work-tree=" <> checkoutPath, "restore", "--source=" <> cid, "--", "."] ""
["tree", tid]:_ <- map words . lines <$> readProcess "git" ["cat-file", "-p", cid] ""
return tid
let jdir = dir </> "jobs" </> tid </> stringJobName (jobName job)
liftIO $ createDirectoryIfMissing True jdir
inner checkoutPath jdir
runJob :: Job -> [ArtifactOutput] -> FilePath -> FilePath -> ExceptT (JobStatus JobOutput) IO JobOutput
runJob job uses checkoutPath jdir = do
liftIO $ forM_ uses $ \aout -> do
let target = checkoutPath </> aoutWorkPath aout
createDirectoryIfMissing True $ takeDirectory target
copyFile (aoutStorePath aout) target
bracket (liftIO $ openFile (jdir </> "log") WriteMode) (liftIO . hClose) $ \logs -> do
forM_ (jobRecipe job) $ \p -> do
(Just hin, _, _, hp) <- liftIO $ createProcess_ "" p
{ cwd = Just checkoutPath
, std_in = CreatePipe
, std_out = UseHandle logs
, std_err = UseHandle logs
}
liftIO $ hClose hin
exit <- liftIO $ waitForProcess hp
when (exit /= ExitSuccess) $
throwError JobFailed
let adir = jdir </> "artifacts"
artifacts <- forM (jobArtifacts job) $ \(name@(ArtifactName tname), pathCmd) -> liftIO $ do
[path] <- lines <$> readCreateProcess pathCmd { cwd = Just checkoutPath } ""
let target = adir </> T.unpack tname
createDirectoryIfMissing True adir
copyFile (checkoutPath </> path) target
return $ ArtifactOutput
{ aoutName = name
, aoutWorkPath = path
, aoutStorePath = target
}
return JobOutput
{ outName = jobName job
, outArtifacts = artifacts
}
|