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https://github.com/hasura/graphql-engine.git
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24592a516b
* Pass environment variables around as a data structure, via @sordina * Resolving build error * Adding Environment passing note to changelog * Removing references to ILTPollerLog as this seems to have been reintroduced from a bad merge * removing commented-out imports * Language pragmas already set by project * Linking async thread * Apply suggestions from code review Use `runQueryTx` instead of `runLazyTx` for queries. * remove the non-user facing entry in the changelog Co-authored-by: Phil Freeman <paf31@cantab.net> Co-authored-by: Phil Freeman <phil@hasura.io> Co-authored-by: Vamshi Surabhi <0x777@users.noreply.github.com>
41 lines
1.5 KiB
Haskell
41 lines
1.5 KiB
Haskell
module Hasura.Eventing.Common where
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import Control.Concurrent.STM.TVar
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import Control.Monad.STM
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import Hasura.Prelude
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import Hasura.RQL.Types.EventTrigger (EventId)
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import Hasura.RQL.Types.ScheduledTrigger (CronEventId, StandAloneScheduledEventId)
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import qualified Data.Set as Set
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data LockedEventsCtx
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= LockedEventsCtx
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{ leCronEvents :: TVar (Set.Set CronEventId)
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, leStandAloneEvents :: TVar (Set.Set StandAloneScheduledEventId)
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, leEvents :: TVar (Set.Set EventId)
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}
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initLockedEventsCtx :: STM LockedEventsCtx
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initLockedEventsCtx = do
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leCronEvents <- newTVar Set.empty
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leStandAloneEvents <- newTVar Set.empty
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leEvents <- newTVar Set.empty
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return $ LockedEventsCtx{..}
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-- | After the events are fetched from the DB, we store the locked events
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-- in a hash set(order doesn't matter and look ups are faster) in the
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-- event engine context
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saveLockedEvents :: (MonadIO m) => [Text] -> TVar (Set.Set Text) -> m ()
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saveLockedEvents eventIds lockedEvents =
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liftIO $ atomically $ do
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lockedEventsVals <- readTVar lockedEvents
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writeTVar lockedEvents $!
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Set.union lockedEventsVals $ Set.fromList eventIds
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-- | Remove an event from the 'LockedEventsCtx' after it has been processed
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removeEventFromLockedEvents :: MonadIO m => Text -> TVar (Set.Set Text) -> m ()
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removeEventFromLockedEvents eventId lockedEvents =
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liftIO $ atomically $ do
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lockedEventsVals <- readTVar lockedEvents
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writeTVar lockedEvents $! Set.delete eventId lockedEventsVals
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