mirror of
https://github.com/urbit/shrub.git
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318 lines
8.3 KiB
Haskell
318 lines
8.3 KiB
Haskell
module Vere.Worker where
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import ClassyPrelude
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import Control.Lens
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import Data.Void
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import System.Exit (ExitCode)
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import Data.Noun
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import Data.Noun.Atom
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import Data.Noun.Jam
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import Data.Noun.Poet
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import Data.Noun.Pill
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import Vere.Pier.Types
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import System.Process
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import qualified Urbit.Time as Time
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import Data.ByteString (hGet)
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import Data.ByteString.Unsafe (unsafeUseAsCString)
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import Foreign.Ptr (castPtr)
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import Foreign.Storable (peek)
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import qualified Vere.Log as Log
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data Worker = Worker
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{ sendHandle :: Handle
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, recvHandle :: Handle
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, process :: ProcessHandle
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-- , getInput :: STM (Writ ())
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-- , onComputed :: Writ [Effect] -> STM ()
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-- , onExit :: Worker -> IO ()
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-- , task :: Async ()
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}
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--------------------------------------------------------------------------------
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-- Think about how to handle process exit
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-- Tear down subprocess on exit? (terminiteProcess)
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startWorkerProcess :: IO Worker
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startWorkerProcess =
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do
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(Just i, Just o, _, p) <- createProcess pSpec
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pure (Worker i o p)
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where
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pSpec =
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(proc "urbit-worker" []) { std_in = CreatePipe
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, std_out = CreatePipe
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}
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kill :: Worker -> IO ExitCode
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kill w = do
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terminateProcess (process w)
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waitForProcess (process w)
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work :: Word64 -> Jam -> Atom
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work id (Jam a) = jam $ toNoun (Cord "work", id, a)
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newtype Job = Job Void
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deriving newtype (Eq, Show, ToNoun, FromNoun)
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type EventId = Word64
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newtype Ship = Ship Word64 -- @p
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deriving newtype (Eq, Ord, Show, ToNoun, FromNoun)
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newtype ShipId = ShipId (Ship, Bool)
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deriving newtype (Eq, Ord, Show, ToNoun, FromNoun)
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--------------------------------------------------------------------------------
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type Play = Nullable (EventId, Mug, ShipId)
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data Plea
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= Play Play
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| Work EventId Mug Job
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| Done EventId Mug [Eff]
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| Stdr EventId Cord
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| Slog EventId Word32 Tank
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deriving (Eq, Show)
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instance ToNoun Plea where
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toNoun = \case
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Play p -> toNoun (Cord "play", p)
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Work i m j -> toNoun (Cord "work", i, m, j)
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Done i m o -> toNoun (Cord "done", i, m, o)
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Stdr i msg -> toNoun (Cord "stdr", i, msg)
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Slog i p t -> toNoun (Cord "slog", i, p, t)
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instance FromNoun Plea where
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parseNoun n =
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parseNoun n >>= \case
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(Cord "play", p) -> parseNoun p <&> \p -> Play p
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(Cord "work", w) -> parseNoun w <&> \(i, m, j) -> Work i m j
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(Cord "done", d) -> parseNoun d <&> \(i, m, o) -> Done i m o
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(Cord "stdr", r) -> parseNoun r <&> \(i, msg) -> Stdr i msg
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(Cord "slog", s) -> parseNoun s <&> \(i, p, t) -> Slog i p t
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(Cord tag , s) -> fail ("Invalid plea tag: " <> unpack (decodeUtf8 tag))
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--------------------------------------------------------------------------------
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type CompletedEventId = Word64
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type NextEventId = Word64
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type WorkerState = (EventId, Mug)
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type ReplacementEv = (EventId, Mug, Job)
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type WorkResult = (EventId, Mug, [Eff])
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type WorkerResp = (Either ReplacementEv WorkResult)
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-- Exceptions ------------------------------------------------------------------
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data WorkerExn
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= BadComputeId EventId WorkResult
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| BadReplacementId EventId ReplacementEv
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| UnexpectedPlay EventId Play
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| BadPleaAtom Atom
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| BadPleaNoun Noun
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| ReplacedEventDuringReplay EventId ReplacementEv
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| WorkerConnectionClosed
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| UnexpectedPleaOnNewShip Plea
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| InvalidInitialPlea Plea
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deriving (Show)
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instance Exception WorkerExn
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-- Utils -----------------------------------------------------------------------
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printTank :: Word32 -> Tank -> IO ()
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printTank pri t = print "tank"
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guardExn :: Exception e => Bool -> e -> IO ()
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guardExn ok = unless ok . throwIO
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fromJustExn :: Exception e => Maybe a -> e -> IO a
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fromJustExn Nothing exn = throwIO exn
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fromJustExn (Just x) exn = pure x
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--------------------------------------------------------------------------------
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sendAndRecv :: Worker -> EventId -> Atom -> IO WorkerResp
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sendAndRecv w eventId event =
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do
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sendAtom w $ work eventId (Jam event)
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loop
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where
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produce :: WorkResult -> IO WorkerResp
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produce (i, m, o) = do
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guardExn (i /= eventId) (BadComputeId eventId (i, m, o))
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pure $ Right (i, m, o)
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replace :: ReplacementEv -> IO WorkerResp
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replace (i, m, j) = do
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guardExn (i /= eventId) (BadReplacementId eventId (i, m, j))
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pure (Left (i, m, j))
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loop :: IO WorkerResp
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loop = recvPlea w >>= \case
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Play p -> throwIO (UnexpectedPlay eventId p)
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Done i m o -> produce (i, m, o)
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Work i m j -> replace (i, m, j)
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Stdr _ cord -> print cord >> loop
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Slog _ pri t -> printTank pri t >> loop
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sendBootEvent :: LogIdentity -> Worker -> IO ()
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sendBootEvent id w = do
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sendAtom w $ jam $ toNoun (Cord "boot", id)
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-- the ship is booted, but it is behind. shove events to the worker until it is
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-- caught up.
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replay :: Worker
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-> WorkerState
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-> LogIdentity
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-> EventId
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-> (EventId -> Word64 -> IO (Vector (EventId, Atom)))
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-> IO (EventId, Mug)
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replay w (wid, wmug) identity lastCommitedId getEvents = do
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when (wid == 1) (sendBootEvent identity w)
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vLast <- newIORef (wid, wmug)
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loop vLast wid
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readIORef vLast
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where
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-- Replay events in batches of 1000.
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loop vLast curEvent = do
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let toRead = min 1000 (1 + lastCommitedId - curEvent)
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when (toRead > 0) do
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events <- getEvents curEvent toRead
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for_ events $ \(eventId, event) -> do
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sendAndRecv w eventId event >>= \case
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Left ev -> throwIO (ReplacedEventDuringReplay eventId ev)
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Right (id, mug, _) -> writeIORef vLast (id, mug)
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loop vLast (curEvent + toRead)
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bootWorker :: Worker
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-> LogIdentity
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-> Pill
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-> IO ()
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bootWorker w identity pill =
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do
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recvPlea w >>= \case
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Play Nil -> pure ()
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x@(Play _) -> throwIO (UnexpectedPleaOnNewShip x)
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x -> throwIO (InvalidInitialPlea x)
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-- TODO: actually boot the pill
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undefined
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requestSnapshot w
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-- Maybe return the current event id ? But we'll have to figure that out
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-- later.
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pure ()
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resumeWorker :: Worker
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-> LogIdentity
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-> EventId
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-> (EventId -> Word64 -> IO (Vector (EventId, Atom)))
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-> IO (EventId, Mug)
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resumeWorker w identity logLatestEventNumber eventFetcher =
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do
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ws@(eventId, mug) <- recvPlea w >>= \case
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Play Nil -> pure (1, Mug 0)
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Play (NotNil (e, m, _)) -> pure (e, m)
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x -> throwIO (InvalidInitialPlea x)
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r <- replay w ws identity logLatestEventNumber eventFetcher
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requestSnapshot w
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pure r
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workerThread :: Worker -> STM Ovum -> (EventId, Mug) -> IO (Async ())
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workerThread w getEvent (evendId, mug) = async $ forever do
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ovum <- atomically $ getEvent
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currentDate <- Time.now
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let mat = jam (undefined (mug, currentDate, ovum))
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undefined
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-- Writ (eventId + 1) Nothing mat
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-- -- assign a new event id.
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-- -- assign a date
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-- -- get current mug state
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-- -- (jam [mug event])
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-- sendAndRecv
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requestSnapshot :: Worker -> IO ()
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requestSnapshot w = undefined
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-- The flow here is that we start the worker and then we receive a play event
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-- with the current worker state:
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--
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-- <- [%play ...]
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--
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-- Base on this, the main flow is
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--
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-- [%work ] ->
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-- <- [%slog]
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-- <- [%slog]
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-- <- [%slog]
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-- <- [%work crash=tang]
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-- [%work ] -> (replacement)
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-- <- [%slog]
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-- <- [%done]
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-- [%work eventId mat]
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-- response <- recvAtom w
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-- Basic Send and Receive Operations -------------------------------------------
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sendAtom :: Worker -> Atom -> IO ()
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sendAtom w a = hPut (sendHandle w) (unpackAtom a)
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atomBytes :: Iso' Atom ByteString
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atomBytes = pill . pillBS
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packAtom = view (from atomBytes)
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unpackAtom :: Atom -> ByteString
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unpackAtom = view atomBytes
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recvLen :: Worker -> IO Word64
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recvLen w = do
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bs <- hGet (recvHandle w) 8
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case length bs of
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-- This is not big endian safe
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8 -> unsafeUseAsCString bs (peek . castPtr)
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_ -> throwIO WorkerConnectionClosed
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recvBytes :: Worker -> Word64 -> IO ByteString
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recvBytes w = hGet (recvHandle w) . fromIntegral
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recvAtom :: Worker -> IO Atom
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recvAtom w = do
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len <- recvLen w
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bs <- recvBytes w len
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pure (packAtom bs)
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recvPlea :: Worker -> IO Plea
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recvPlea w = do
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a <- recvAtom w
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n <- fromJustExn (cue a) (BadPleaAtom a)
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p <- fromJustExn (fromNoun n) (BadPleaNoun n)
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pure p
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