mirror of
https://github.com/hasura/graphql-engine.git
synced 2024-12-24 07:52:14 +03:00
335 lines
12 KiB
Haskell
335 lines
12 KiB
Haskell
{-# LANGUAGE FlexibleContexts #-}
|
|
{-# LANGUAGE OverloadedStrings #-}
|
|
{-# LANGUAGE QuasiQuotes #-}
|
|
{-# LANGUAGE ScopedTypeVariables #-}
|
|
{-# LANGUAGE TemplateHaskell #-}
|
|
|
|
module Hasura.Events.Lib
|
|
( initEventEngineCtx
|
|
, processEventQueue
|
|
, unlockAllEvents
|
|
, defaultMaxEventThreads
|
|
, defaultPollingIntervalSec
|
|
, Event(..)
|
|
) where
|
|
|
|
import Control.Concurrent (threadDelay)
|
|
import Control.Concurrent.Async (async, waitAny)
|
|
import Control.Concurrent.STM.TVar
|
|
import Control.Monad.STM (STM, atomically, retry)
|
|
import Data.Aeson
|
|
import Data.Aeson.Casing
|
|
import Data.Aeson.TH
|
|
import Data.Either (isLeft)
|
|
import Data.Has
|
|
import Data.Int (Int64)
|
|
import Data.IORef (IORef, readIORef)
|
|
import Hasura.Events.HTTP
|
|
import Hasura.Prelude
|
|
import Hasura.RQL.Types
|
|
import Hasura.SQL.Types
|
|
|
|
import qualified Control.Concurrent.STM.TQueue as TQ
|
|
import qualified Control.Retry as R
|
|
import qualified Data.ByteString.Lazy as B
|
|
import qualified Data.HashMap.Strict as M
|
|
import qualified Data.TByteString as TBS
|
|
import qualified Data.Text as T
|
|
import qualified Data.Time.Clock as Time
|
|
import qualified Database.PG.Query as Q
|
|
import qualified Hasura.GraphQL.Schema as GS
|
|
import qualified Hasura.Logging as L
|
|
import qualified Network.HTTP.Types as N
|
|
import qualified Network.Wreq as W
|
|
import qualified Network.Wreq.Session as WS
|
|
|
|
|
|
type CacheRef = IORef (SchemaCache, GS.GCtxMap)
|
|
|
|
newtype EventInternalErr
|
|
= EventInternalErr QErr
|
|
deriving (Show, Eq)
|
|
|
|
instance L.ToEngineLog EventInternalErr where
|
|
toEngineLog (EventInternalErr qerr) = (L.LevelError, "event-trigger", toJSON qerr )
|
|
|
|
data TriggerMeta
|
|
= TriggerMeta
|
|
{ tmId :: TriggerId
|
|
, tmName :: TriggerName
|
|
} deriving (Show, Eq)
|
|
|
|
$(deriveJSON (aesonDrop 2 snakeCase){omitNothingFields=True} ''TriggerMeta)
|
|
|
|
data Event
|
|
= Event
|
|
{ eId :: EventId
|
|
, eTable :: QualifiedTable
|
|
, eTrigger :: TriggerMeta
|
|
, eEvent :: Value
|
|
-- , eDelivered :: Bool
|
|
-- , eError :: Bool
|
|
, eTries :: Int
|
|
, eCreatedAt :: Time.UTCTime
|
|
} deriving (Show, Eq)
|
|
|
|
instance ToJSON Event where
|
|
toJSON (Event eid (QualifiedTable sn tn) trigger event _ created)=
|
|
object [ "id" .= eid
|
|
, "table" .= object [ "schema" .= sn
|
|
, "name" .= tn
|
|
]
|
|
, "trigger" .= trigger
|
|
, "event" .= event
|
|
, "created_at" .= created
|
|
]
|
|
|
|
$(deriveFromJSON (aesonDrop 1 snakeCase){omitNothingFields=True} ''Event)
|
|
|
|
data Invocation
|
|
= Invocation
|
|
{ iEventId :: EventId
|
|
, iStatus :: Int64
|
|
, iRequest :: Value
|
|
, iResponse :: TBS.TByteString
|
|
}
|
|
|
|
data EventEngineCtx
|
|
= EventEngineCtx
|
|
{ _eeCtxEventQueue :: TQ.TQueue Event
|
|
, _eeCtxEventThreads :: TVar Int
|
|
, _eeCtxMaxEventThreads :: Int
|
|
, _eeCtxPollingIntervalSec :: Int
|
|
}
|
|
|
|
defaultMaxEventThreads :: Int
|
|
defaultMaxEventThreads = 100
|
|
|
|
defaultPollingIntervalSec :: Int
|
|
defaultPollingIntervalSec = 1
|
|
|
|
initEventEngineCtx :: Int -> Int -> STM EventEngineCtx
|
|
initEventEngineCtx maxT pollI = do
|
|
q <- TQ.newTQueue
|
|
c <- newTVar 0
|
|
return $ EventEngineCtx q c maxT pollI
|
|
|
|
processEventQueue :: L.LoggerCtx -> WS.Session -> Q.PGPool -> CacheRef -> EventEngineCtx -> IO ()
|
|
processEventQueue logctx httpSess pool cacheRef eectx = do
|
|
putStrLn "event_trigger: starting workers"
|
|
threads <- mapM async [pollThread , consumeThread]
|
|
void $ waitAny threads
|
|
where
|
|
pollThread = pollEvents (mkHLogger logctx) pool eectx
|
|
consumeThread = consumeEvents (mkHLogger logctx) httpSess pool cacheRef eectx
|
|
|
|
pollEvents
|
|
:: HLogger -> Q.PGPool -> EventEngineCtx -> IO ()
|
|
pollEvents logger pool eectx = forever $ do
|
|
let EventEngineCtx q _ _ pollI = eectx
|
|
eventsOrError <- runExceptT $ Q.runTx pool (Q.RepeatableRead, Just Q.ReadWrite) fetchEvents
|
|
case eventsOrError of
|
|
Left err -> logger $ L.toEngineLog $ EventInternalErr err
|
|
Right events -> atomically $ mapM_ (TQ.writeTQueue q) events
|
|
threadDelay (pollI * 1000 * 1000)
|
|
|
|
consumeEvents
|
|
:: HLogger -> WS.Session -> Q.PGPool -> CacheRef -> EventEngineCtx -> IO ()
|
|
consumeEvents logger httpSess pool cacheRef eectx = forever $ do
|
|
event <- atomically $ do
|
|
let EventEngineCtx q _ _ _ = eectx
|
|
TQ.readTQueue q
|
|
async $ runReaderT (processEvent pool event) (logger, httpSess, cacheRef, eectx)
|
|
|
|
processEvent
|
|
:: ( MonadReader r m
|
|
, MonadIO m
|
|
, Has WS.Session r
|
|
, Has HLogger r
|
|
, Has CacheRef r
|
|
, Has EventEngineCtx r
|
|
)
|
|
=> Q.PGPool -> Event -> m ()
|
|
processEvent pool e = do
|
|
(logger:: HLogger) <- asks getter
|
|
retryPolicy <- getRetryPolicy e
|
|
res <- R.retrying retryPolicy shouldRetry $ tryWebhook pool e
|
|
liftIO $ either (errorFn logger) (void.return) res
|
|
unlockRes <- liftIO $ runExceptT $ runUnlockQ pool e
|
|
liftIO $ either (logQErr logger) (void.return ) unlockRes
|
|
where
|
|
shouldRetry :: (Monad m ) => R.RetryStatus -> Either HTTPErr a -> m Bool
|
|
shouldRetry _ eitherResp = return $ isLeft eitherResp
|
|
|
|
errorFn :: HLogger -> HTTPErr -> IO ()
|
|
errorFn logger err = do
|
|
logger $ L.toEngineLog err
|
|
errorRes <- runExceptT $ runErrorQ pool e
|
|
case errorRes of
|
|
Left err' -> logQErr logger err'
|
|
Right _ -> return ()
|
|
|
|
logQErr :: HLogger -> QErr -> IO ()
|
|
logQErr logger err = logger $ L.toEngineLog $ EventInternalErr err
|
|
|
|
getRetryPolicy
|
|
:: ( MonadReader r m
|
|
, MonadIO m
|
|
, Has WS.Session r
|
|
, Has HLogger r
|
|
, Has CacheRef r
|
|
, Has EventEngineCtx r
|
|
)
|
|
=> Event -> m (R.RetryPolicyM m)
|
|
getRetryPolicy e = do
|
|
cacheRef::CacheRef <- asks getter
|
|
(cache, _) <- liftIO $ readIORef cacheRef
|
|
let eti = getEventTriggerInfoFromEvent cache e
|
|
retryConfM = etiRetryConf <$> eti
|
|
retryConf = fromMaybe (RetryConf 0 10) retryConfM
|
|
|
|
let remainingRetries = max 0 $ fromIntegral (rcNumRetries retryConf) - getTries
|
|
delay = fromIntegral (rcIntervalSec retryConf) * 1000000
|
|
policy = R.constantDelay delay <> R.limitRetries remainingRetries
|
|
return policy
|
|
where
|
|
getTries :: Int
|
|
getTries = fromIntegral $ eTries e
|
|
|
|
tryWebhook
|
|
:: ( MonadReader r m
|
|
, MonadIO m
|
|
, Has WS.Session r
|
|
, Has HLogger r
|
|
, Has CacheRef r
|
|
, Has EventEngineCtx r
|
|
)
|
|
=> Q.PGPool -> Event -> R.RetryStatus -> m (Either HTTPErr B.ByteString)
|
|
tryWebhook pool e _ = do
|
|
logger:: HLogger <- asks getter
|
|
cacheRef::CacheRef <- asks getter
|
|
(cache, _) <- liftIO $ readIORef cacheRef
|
|
let eti = getEventTriggerInfoFromEvent cache e
|
|
case eti of
|
|
Nothing -> return $ Left $ HOther "table or event-trigger not found"
|
|
Just et -> do
|
|
let webhook = etiWebhook et
|
|
createdAt = eCreatedAt e
|
|
eventId = eId e
|
|
eeCtx <- asks getter
|
|
|
|
-- wait for counter and then increment beforing making http
|
|
liftIO $ atomically $ do
|
|
let EventEngineCtx _ c maxT _ = eeCtx
|
|
countThreads <- readTVar c
|
|
if countThreads >= maxT
|
|
then retry
|
|
else modifyTVar' c (+1)
|
|
eitherResp <- runExceptT $ runHTTP W.defaults (mkAnyHTTPPost (T.unpack webhook) (Just $ toJSON e)) (Just (ExtraContext createdAt eventId))
|
|
|
|
--decrement counter once http is done
|
|
liftIO $ atomically $ do
|
|
let EventEngineCtx _ c _ _ = eeCtx
|
|
modifyTVar' c (\v -> v - 1)
|
|
|
|
finally <- liftIO $ runExceptT $ case eitherResp of
|
|
Left err ->
|
|
case err of
|
|
HClient excp -> runFailureQ pool $ Invocation (eId e) 1000 (toJSON e) (TBS.fromLBS $ encode $ show excp)
|
|
HParse _ detail -> runFailureQ pool $ Invocation (eId e) 1001 (toJSON e) (TBS.fromLBS $ encode detail)
|
|
HStatus status detail -> runFailureQ pool $ Invocation (eId e) (fromIntegral $ N.statusCode status) (toJSON e) detail
|
|
HOther detail -> runFailureQ pool $ Invocation (eId e) 500 (toJSON e) (TBS.fromLBS $ encode detail)
|
|
Right resp -> runSuccessQ pool e $ Invocation (eId e) 200 (toJSON e) (TBS.fromLBS resp)
|
|
case finally of
|
|
Left err -> liftIO $ logger $ L.toEngineLog $ EventInternalErr err
|
|
Right _ -> return ()
|
|
return eitherResp
|
|
|
|
getEventTriggerInfoFromEvent :: SchemaCache -> Event -> Maybe EventTriggerInfo
|
|
getEventTriggerInfoFromEvent sc e = let table = eTable e
|
|
tableInfo = M.lookup table $ scTables sc
|
|
in M.lookup ( tmName $ eTrigger e) =<< (tiEventTriggerInfoMap <$> tableInfo)
|
|
|
|
fetchEvents :: Q.TxE QErr [Event]
|
|
fetchEvents =
|
|
map uncurryEvent <$> Q.listQE defaultTxErrorHandler [Q.sql|
|
|
UPDATE hdb_catalog.event_log
|
|
SET locked = 't'
|
|
WHERE id IN ( SELECT l.id
|
|
FROM hdb_catalog.event_log l
|
|
JOIN hdb_catalog.event_triggers e
|
|
ON (l.trigger_id = e.id)
|
|
WHERE l.delivered ='f' and l.error = 'f' and l.locked = 'f'
|
|
LIMIT 100 )
|
|
RETURNING id, schema_name, table_name, trigger_id, trigger_name, payload::json, tries, created_at
|
|
|] () True
|
|
where uncurryEvent (id', sn, tn, trid, trn, Q.AltJ payload, tries, created) = Event id' (QualifiedTable sn tn) (TriggerMeta trid trn) payload tries created
|
|
|
|
insertInvocation :: Invocation -> Q.TxE QErr ()
|
|
insertInvocation invo = do
|
|
Q.unitQE defaultTxErrorHandler [Q.sql|
|
|
INSERT INTO hdb_catalog.event_invocation_logs (event_id, status, request, response)
|
|
VALUES ($1, $2, $3, $4)
|
|
|] (iEventId invo, iStatus invo, Q.AltJ $ toJSON $ iRequest invo, Q.AltJ $ toJSON $ iResponse invo) True
|
|
Q.unitQE defaultTxErrorHandler [Q.sql|
|
|
UPDATE hdb_catalog.event_log
|
|
SET tries = tries + 1
|
|
WHERE id = $1
|
|
|] (Identity $ iEventId invo) True
|
|
|
|
markDelivered :: Event -> Q.TxE QErr ()
|
|
markDelivered e =
|
|
Q.unitQE defaultTxErrorHandler [Q.sql|
|
|
UPDATE hdb_catalog.event_log
|
|
SET delivered = 't', error = 'f'
|
|
WHERE id = $1
|
|
|] (Identity $ eId e) True
|
|
|
|
markError :: Event -> Q.TxE QErr ()
|
|
markError e =
|
|
Q.unitQE defaultTxErrorHandler [Q.sql|
|
|
UPDATE hdb_catalog.event_log
|
|
SET error = 't'
|
|
WHERE id = $1
|
|
|] (Identity $ eId e) True
|
|
|
|
-- lockEvent :: Event -> Q.TxE QErr ()
|
|
-- lockEvent e =
|
|
-- Q.unitQE defaultTxErrorHandler [Q.sql|
|
|
-- UPDATE hdb_catalog.event_log
|
|
-- SET locked = 't'
|
|
-- WHERE id = $1
|
|
-- |] (Identity $ eId e) True
|
|
|
|
unlockEvent :: Event -> Q.TxE QErr ()
|
|
unlockEvent e =
|
|
Q.unitQE defaultTxErrorHandler [Q.sql|
|
|
UPDATE hdb_catalog.event_log
|
|
SET locked = 'f'
|
|
WHERE id = $1
|
|
|] (Identity $ eId e) True
|
|
|
|
unlockAllEvents :: Q.TxE QErr ()
|
|
unlockAllEvents =
|
|
Q.unitQE defaultTxErrorHandler [Q.sql|
|
|
UPDATE hdb_catalog.event_log
|
|
SET locked = 'f'
|
|
|] () False
|
|
|
|
runFailureQ :: Q.PGPool -> Invocation -> ExceptT QErr IO ()
|
|
runFailureQ pool invo = Q.runTx pool (Q.RepeatableRead, Just Q.ReadWrite) $ insertInvocation invo
|
|
|
|
runSuccessQ :: Q.PGPool -> Event -> Invocation -> ExceptT QErr IO ()
|
|
runSuccessQ pool e invo = Q.runTx pool (Q.RepeatableRead, Just Q.ReadWrite) $ do
|
|
insertInvocation invo
|
|
markDelivered e
|
|
|
|
runErrorQ :: Q.PGPool -> Event -> ExceptT QErr IO ()
|
|
runErrorQ pool e = Q.runTx pool (Q.RepeatableRead, Just Q.ReadWrite) $ markError e
|
|
|
|
-- runLockQ :: Q.PGPool -> Event -> ExceptT QErr IO ()
|
|
-- runLockQ pool e = Q.runTx pool (Q.RepeatableRead, Just Q.ReadWrite) $ lockEvent e
|
|
|
|
runUnlockQ :: Q.PGPool -> Event -> ExceptT QErr IO ()
|
|
runUnlockQ pool e = Q.runTx pool (Q.RepeatableRead, Just Q.ReadWrite) $ unlockEvent e
|