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semantic/src/GitmonClient.hs

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{-# LANGUAGE RecordWildCards, BangPatterns, DeriveGeneric #-}
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module GitmonClient where
import Data.Aeson
import Data.Aeson.Types
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import Data.ByteString.Lazy (toStrict)
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import Data.Text (pack, unpack, toLower)
import qualified Data.Yaml as Y
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import GHC.Generics
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import Git.Libgit2
import Network.Socket
import Network.Socket.ByteString (sendAll)
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import Prelude
import Prologue hiding (toStrict)
import System.Clock
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import System.Directory (getCurrentDirectory)
import System.Environment
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data ProcIO = ProcIO {
read_bytes :: Integer
, write_bytes :: Integer
} deriving (Show, Generic)
instance FromJSON ProcIO
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data ProcessData =
ProcessUpdateData { gitDir :: String
, program :: String
, realIP :: Maybe String
, repoID :: Maybe String
, repoName :: Maybe String
, userID :: Maybe String
, via :: String }
| ProcessScheduleData
| ProcessFinishData { cpu :: Integer
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, diskReadBytes :: Integer
, diskWriteBytes :: Integer
, resultCode :: Integer } deriving (Generic, Show)
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instance ToJSON ProcessData where
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toJSON = genericToJSON defaultOptions { fieldLabelModifier = camelTo2 '_' }
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data GitmonCommand = Update
| Finish
| Schedule deriving (Generic, Show)
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instance ToJSON GitmonCommand where
toJSON = genericToJSON defaultOptions { constructorTagModifier = unpack . toLower . pack }
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data GitmonMsg = GitmonMsg { command :: GitmonCommand, processData :: ProcessData } deriving (Show)
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instance ToJSON GitmonMsg where
toJSON GitmonMsg{..} = object ["command" .= command, "data" .= processData]
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gitmonSocketAddr :: String
gitmonSocketAddr = "/tmp/gitstats.sock"
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procFileAddr :: String
procFileAddr = "/proc/self/io"
clock :: Clock
clock = Realtime
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processJSON :: GitmonCommand -> ProcessData -> ByteString
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processJSON command processData = (toStrict . encode $ GitmonMsg command processData) <> "\n"
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type ProcInfo = Either Y.ParseException (Maybe ProcIO)
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safeIO :: MonadIO m => IO () -> m ()
safeIO command = liftIO $ command `catch` noop
safeIOValue :: MonadIO m => IO a -> m (Maybe a)
safeIOValue command = liftIO $ (Just <$> command) `catch` noopValue
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noop :: IOException -> IO ()
noop _ = pure ()
noopValue :: IOException -> IO (Maybe a)
noopValue _ = pure Nothing
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reportGitmon :: String -> ReaderT LgRepo IO a -> ReaderT LgRepo IO a
reportGitmon program gitCommand = do
maybeSoc <- safeIOValue $ socket AF_UNIX Stream defaultProtocol
case maybeSoc of
Nothing -> gitCommand
Just soc -> do
safeIO $ connect soc (SockAddrUnix gitmonSocketAddr)
result <- reportGitmon' soc program gitCommand
safeIO $ close soc
pure result
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reportGitmon' :: Socket -> String -> ReaderT LgRepo IO a -> ReaderT LgRepo IO a
reportGitmon' soc program gitCommand = do
(gitDir, realIP, repoID, repoName, userID) <- liftIO loadEnvVars
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safeIO $ sendAll soc (processJSON Update (ProcessUpdateData gitDir program realIP repoID repoName userID "semantic-diff"))
safeIO $ sendAll soc (processJSON Schedule ProcessScheduleData)
(startTime, beforeProcIOContents) <- liftIO collectStats
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!result <- gitCommand
(afterTime, afterProcIOContents) <- liftIO collectStats
let (cpuTime, diskReadBytes', diskWriteBytes', resultCode') = procStats startTime afterTime beforeProcIOContents afterProcIOContents
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safeIO $ sendAll soc (processJSON Finish ProcessFinishData { cpu = cpuTime, diskReadBytes = diskReadBytes', diskWriteBytes = diskWriteBytes', resultCode = resultCode' })
pure result
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where collectStats :: IO (TimeSpec, ProcInfo)
collectStats = do
time <- getTime clock
procIOContents <- Y.decodeFileEither procFileAddr :: IO ProcInfo
pure (time, procIOContents)
procStats :: TimeSpec -> TimeSpec -> ProcInfo -> ProcInfo -> ( Integer, Integer, Integer, Integer )
procStats beforeTime afterTime beforeProcIOContents afterProcIOContents = ( cpuTime, diskReadBytes, diskWriteBytes, resultCode )
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where
cpuTime = toNanoSecs afterTime - toNanoSecs beforeTime
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beforeDiskReadBytes = either (const 0) (maybe 0 read_bytes) beforeProcIOContents
afterDiskReadBytes = either (const 0) (maybe 0 read_bytes) afterProcIOContents
beforeDiskWriteBytes = either (const 0) (maybe 0 write_bytes) beforeProcIOContents
afterDiskWriteBytes = either (const 0) (maybe 0 write_bytes) afterProcIOContents
diskReadBytes = afterDiskReadBytes - beforeDiskReadBytes
diskWriteBytes = afterDiskWriteBytes - beforeDiskWriteBytes
resultCode = 0
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loadEnvVars :: IO (String, Maybe String, Maybe String, Maybe String, Maybe String)
loadEnvVars = do
pwd <- getCurrentDirectory
gitDir <- fromMaybe pwd <$> lookupEnv "GIT_DIR"
realIP <- lookupEnv "GIT_SOCKSTAT_VAR_real_ip"
repoID <- lookupEnv "GIT_SOCKSTAT_VAR_repo_id"
repoName <- lookupEnv "GIT_SOCKSTAT_VAR_repo_name"
userID <- lookupEnv "GIT_SOCKSTAT_VAR_user_id"
pure (gitDir, realIP, repoID, repoName, userID)