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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
module Worker (linterThread, Job(..)) where
import Universum
import CheckDir (recursiveCheckDir,
shrinkDirResult)
import Control.Concurrent.Async (async, link)
import Control.Concurrent.STM (writeTChan)
import Control.Concurrent.STM.TQueue
import Control.Exception (IOException, handle)
import Control.Monad.Logger (logError, logErrorN, logInfoN,
runStdoutLoggingT)
import qualified Data.Text as T
import qualified Data.UUID as UUID
import qualified Data.UUID.V4 as UUID
import Fmt ((+|), (|+))
import LintConfig (stuffConfig)
import Server (Config, JobStatus (..),
Org (..),
RealtimeMsg (RelintPending, Reload),
RemoteRef (..), ServerState,
adjustedPath, getJobStatus,
newRealtimeChannel,
setJobStatus, tmpdir, toSha)
import System.Directory (doesDirectoryExist)
import System.Exit (ExitCode (ExitFailure, ExitSuccess))
import System.FilePath ((</>))
import System.Process
import WriteRepo (writeAdjustedRepository)
data Job = Job
{ jobRef :: RemoteRef
, jobOrg :: Org True
}
linterThread :: Config True -> TQueue Job -> MVar ServerState -> IO Void
linterThread config queue done = forever $ do
next <- atomically (readTQueue queue)
-- TODO: this doesn't guard against two jobs running on the same repo!
job <- async $ runJob config next done
-- TODO: is this a good idea? will crash the server if a job thread fails
link job
-- | the actual check function. Calls out to git to update the
-- repository, create a new worktree, lints it, then tells git to
-- delete that tree again.
--
-- May occasionally be brittle (if someone else changed files)
-- TODO: re-add proper fancy (colourful?) logging
runJob :: Config True -> Job -> MVar ServerState -> IO ()
runJob config Job {..} done = do
rand <- UUID.nextRandom
let workdir = "/tmp" </> ("worktree-" <> UUID.toString rand)
handle whoops
$ finally (lint workdir) (cleanup workdir)
where
lintConfig = stuffConfig (orgLintconfig jobOrg) (reponame jobRef)
lint workdir = do
maybeRealtime <- getJobStatus done (orgSlug jobOrg) (toSha jobRef) >>= \case
Nothing -> pure Nothing
Just (org, ref, jobstatus) -> case jobstatus of
Linted res rev (_, realtime) -> do
setJobStatus done org ref (Linted res rev (True, realtime))
pure $ Just realtime
Pending realtime -> pure $ Just realtime
_ -> pure Nothing
whenJust maybeRealtime $ \realtime ->
atomically $ writeTChan realtime RelintPending
ifM (doesDirectoryExist gitdir)
-- TODO: these calls fail for dumb http, add some fallback!
(callgit gitdir
[ "fetch", "origin", toString ref, "--depth", "1" ])
(callProcess "git"
[ "clone", toString url, "--bare"
, "--depth", "1", "-b", toString ref, gitdir])
rev <- map T.strip -- git returns a newline here
$ readgit' gitdir ["rev-parse", toString ref]
let outPath = adjustedPath rev jobOrg
callgit gitdir [ "worktree", "add", "--force", workdir, toString ref ]
res <- recursiveCheckDir lintConfig workdir (orgEntrypoint jobOrg)
>>= evaluateNF
writeAdjustedRepository lintConfig workdir (toString outPath) res
>>= runStdoutLoggingT . \case
ExitSuccess ->
logInfoN $ "linted map "+| (show jobRef :: Text) |+"."
ExitFailure 1 ->
logInfoN $ "linted map "+| (show jobRef :: Text) |+ ", which failed."
ExitFailure 2 ->
-- TODO: shouldn't have linted this map at all
logErrorN $ "outpath "+|outPath|+" already exists!"
ExitFailure _ ->
-- writeAdjustedRepository does not return other codes
$(logError) "wtf, this is impossible"
realtime <- case maybeRealtime of
Just realtime -> do
atomically $ writeTChan realtime Reload
pure realtime
Nothing ->
newRealtimeChannel
setJobStatus done jobOrg jobRef $
Linted (shrinkDirResult res) rev (False, realtime)
cleanup workdir = do
callgit gitdir [ "worktree", "remove", "-f", "-f", workdir ]
whoops (error :: IOException) = runStdoutLoggingT $ do
logErrorN (show error)
liftIO $ setJobStatus done jobOrg jobRef $ Failed (show error)
url = repourl jobRef
ref = reporef jobRef
gitdir = view tmpdir config </> toString hashedname
hashedname = T.map escapeSlash url
where escapeSlash = \case { '/' -> '-'; a -> a }
readgit' :: MonadIO m => FilePath -> [String] -> m Text
readgit' dir args = map toText $
liftIO $ do
print args
readProcess "git" ([ "-C", toString dir ] <> args) ""
callgit :: MonadIO m => FilePath -> [String] -> m ()
callgit dir args =
liftIO $ do
print args
callProcess "git" ([ "-C", toString dir ] <> args)
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