mirror of
https://github.com/hasura/graphql-engine.git
synced 2024-12-17 12:31:52 +03:00
367 lines
12 KiB
Haskell
367 lines
12 KiB
Haskell
module Hasura.RQL.DDL.Subscribe
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( CreateEventTriggerQuery
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, runCreateEventTriggerQuery
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, DeleteEventTriggerQuery
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, runDeleteEventTriggerQuery
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, DeliverEventQuery
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, runDeliverEvent
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-- TODO: review
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, delEventTriggerFromCatalog
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, subTableP2
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, subTableP2Setup
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, mkTriggerQ
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) where
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import Data.Aeson
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import Hasura.Prelude
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import Hasura.RQL.DDL.Headers
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import Hasura.RQL.DML.Internal
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import Hasura.RQL.Types
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import Hasura.Server.Utils
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import Hasura.SQL.Types
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import System.Environment (lookupEnv)
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import qualified Hasura.SQL.DML as S
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import qualified Data.FileEmbed as FE
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import qualified Data.HashMap.Strict as HashMap
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import qualified Data.Text as T
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import qualified Database.PG.Query as Q
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data OpVar = OLD | NEW deriving (Show)
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triggerTmplt :: Maybe GingerTmplt
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triggerTmplt = case parseGingerTmplt $(FE.embedStringFile "src-rsr/trigger.sql.j2") of
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Left _ -> Nothing
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Right tmplt -> Just tmplt
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pgIdenTrigger:: Ops -> TriggerName -> T.Text
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pgIdenTrigger op trn = pgFmtIden (qualifyTriggerName op trn)
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where
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qualifyTriggerName op' trn' = "notify_hasura_" <> trn' <> "_" <> T.pack (show op')
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getDropFuncSql :: Ops -> TriggerName -> T.Text
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getDropFuncSql op trn = "DROP FUNCTION IF EXISTS"
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<> " hdb_views." <> pgIdenTrigger op trn <> "()"
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<> " CASCADE"
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getTriggerSql
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:: Ops
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-> TriggerId
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-> TriggerName
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-> QualifiedTable
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-> [PGColInfo]
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-> Bool
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-> Maybe SubscribeOpSpec
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-> Maybe T.Text
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getTriggerSql op trid trn qt allCols strfyNum spec =
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let globalCtx = HashMap.fromList
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[ (T.pack "ID", trid)
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, (T.pack "NAME", trn)
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, (T.pack "QUALIFIED_TRIGGER_NAME", pgIdenTrigger op trn)
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, (T.pack "QUALIFIED_TABLE", toSQLTxt qt)
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]
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opCtx = maybe HashMap.empty (createOpCtx op) spec
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context = HashMap.union globalCtx opCtx
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in
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spec >> renderGingerTmplt context <$> triggerTmplt
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where
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createOpCtx op1 (SubscribeOpSpec columns payload) =
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HashMap.fromList
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[ (T.pack "OPERATION", T.pack $ show op1)
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, (T.pack "OLD_ROW", toSQLTxt $ renderRow OLD columns )
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, (T.pack "NEW_ROW", toSQLTxt $ renderRow NEW columns )
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, (T.pack "OLD_PAYLOAD_EXPRESSION", toSQLTxt $ renderOldDataExp op1 $ fromMaybePayload payload )
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, (T.pack "NEW_PAYLOAD_EXPRESSION", toSQLTxt $ renderNewDataExp op1 $ fromMaybePayload payload )
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]
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renderOldDataExp op2 scs =
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case op2 of
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INSERT -> S.SEUnsafe "NULL"
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UPDATE -> getRowExpression OLD scs
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DELETE -> getRowExpression OLD scs
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renderNewDataExp op2 scs =
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case op2 of
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INSERT -> getRowExpression NEW scs
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UPDATE -> getRowExpression NEW scs
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DELETE -> S.SEUnsafe "NULL"
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getRowExpression opVar scs =
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case scs of
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SubCStar -> applyRowToJson $ S.SEUnsafe $ opToTxt opVar
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SubCArray cols -> applyRowToJson $
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S.mkRowExp $ map (toExtr . mkQId opVar) $
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getColInfos cols allCols
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applyRowToJson e = S.SEFnApp "row_to_json" [e] Nothing
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applyRow e = S.SEFnApp "row" [e] Nothing
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toExtr = flip S.Extractor Nothing
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mkQId opVar colInfo = toJSONableExp strfyNum (pgiType colInfo) $
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S.SEQIden $ S.QIden (opToQual opVar) $ toIden $ pgiName colInfo
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opToQual = S.QualVar . opToTxt
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opToTxt = T.pack . show
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renderRow opVar scs =
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case scs of
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SubCStar -> applyRow $ S.SEUnsafe $ opToTxt opVar
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SubCArray cols -> applyRow $
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S.mkRowExp $ map (toExtr . mkQId opVar) $
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getColInfos cols allCols
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fromMaybePayload = fromMaybe SubCStar
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mkTriggerQ
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:: TriggerId
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-> TriggerName
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-> QualifiedTable
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-> [PGColInfo]
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-> Bool
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-> TriggerOpsDef
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-> Q.TxE QErr ()
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mkTriggerQ trid trn qt allCols strfyNum (TriggerOpsDef insert update delete) = do
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let msql = getTriggerSql INSERT trid trn qt allCols strfyNum insert
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<> getTriggerSql UPDATE trid trn qt allCols strfyNum update
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<> getTriggerSql DELETE trid trn qt allCols strfyNum delete
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case msql of
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Just sql -> Q.multiQE defaultTxErrorHandler (Q.fromText sql)
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Nothing -> throw500 "no trigger sql generated"
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delTriggerQ :: TriggerName -> Q.TxE QErr ()
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delTriggerQ trn = mapM_ (\op -> Q.unitQE
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defaultTxErrorHandler
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(Q.fromText $ getDropFuncSql op trn) () False) [INSERT, UPDATE, DELETE]
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addEventTriggerToCatalog
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:: QualifiedTable
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-> [PGColInfo]
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-> Bool
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-> EventTriggerConf
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-> Q.TxE QErr TriggerId
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addEventTriggerToCatalog qt allCols strfyNum etc = do
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ids <- map runIdentity <$> Q.listQE defaultTxErrorHandler
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[Q.sql|
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INSERT into hdb_catalog.event_triggers
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(name, type, schema_name, table_name, configuration)
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VALUES ($1, 'table', $2, $3, $4)
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RETURNING id
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|] (name, sn, tn, Q.AltJ $ toJSON etc) True
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trid <- getTrid ids
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mkTriggerQ trid name qt allCols strfyNum opsdef
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return trid
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where
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QualifiedObject sn tn = qt
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(EventTriggerConf name opsdef _ _ _ _) = etc
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getTrid [] = throw500 "could not create event-trigger"
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getTrid (x:_) = return x
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delEventTriggerFromCatalog :: TriggerName -> Q.TxE QErr ()
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delEventTriggerFromCatalog trn = do
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Q.unitQE defaultTxErrorHandler [Q.sql|
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DELETE FROM
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hdb_catalog.event_triggers
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WHERE name = $1
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|] (Identity trn) True
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delTriggerQ trn
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updateEventTriggerToCatalog
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:: QualifiedTable
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-> [PGColInfo]
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-> Bool
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-> EventTriggerConf
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-> Q.TxE QErr TriggerId
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updateEventTriggerToCatalog qt allCols strfyNum etc = do
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ids <- map runIdentity <$> Q.listQE defaultTxErrorHandler
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[Q.sql|
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UPDATE hdb_catalog.event_triggers
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SET
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configuration = $1
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WHERE name = $2
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RETURNING id
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|] (Q.AltJ $ toJSON etc, name) True
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trid <- getTrid ids
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delTriggerQ name
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mkTriggerQ trid name qt allCols strfyNum opsdef
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return trid
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where
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EventTriggerConf name opsdef _ _ _ _ = etc
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getTrid [] = throw500 "could not update event-trigger"
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getTrid (x:_) = return x
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fetchEvent :: EventId -> Q.TxE QErr (EventId, Bool)
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fetchEvent eid = do
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events <- Q.listQE defaultTxErrorHandler
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[Q.sql|
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SELECT l.id, l.locked
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FROM hdb_catalog.event_log l
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JOIN hdb_catalog.event_triggers e
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ON l.trigger_id = e.id
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WHERE l.id = $1
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|] (Identity eid) True
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event <- getEvent events
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assertEventUnlocked event
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return event
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where
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getEvent [] = throw400 NotExists "event not found"
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getEvent (x:_) = return x
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assertEventUnlocked (_, locked) = when locked $
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throw400 Busy "event is already being processed"
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markForDelivery :: EventId -> Q.TxE QErr ()
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markForDelivery eid =
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Q.unitQE defaultTxErrorHandler [Q.sql|
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UPDATE hdb_catalog.event_log
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SET
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delivered = 'f',
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error = 'f',
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tries = 0
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WHERE id = $1
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|] (Identity eid) True
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subTableP1 :: (UserInfoM m, QErrM m, CacheRM m) => CreateEventTriggerQuery -> m (QualifiedTable, Bool, EventTriggerConf)
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subTableP1 (CreateEventTriggerQuery name qt insert update delete retryConf webhook webhookFromEnv mheaders replace) = do
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adminOnly
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ti <- askTabInfo qt
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-- can only replace for same table
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when replace $ do
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ti' <- askTabInfoFromTrigger name
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when (tiName ti' /= tiName ti) $ throw400 NotSupported "cannot replace table or schema for trigger"
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assertCols ti insert
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assertCols ti update
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assertCols ti delete
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let rconf = fromMaybe defaultRetryConf retryConf
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return (qt, replace, EventTriggerConf name (TriggerOpsDef insert update delete) webhook webhookFromEnv rconf mheaders)
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where
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assertCols _ Nothing = return ()
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assertCols ti (Just sos) = do
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let cols = sosColumns sos
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case cols of
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SubCStar -> return ()
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SubCArray pgcols -> forM_ pgcols (assertPGCol (tiFieldInfoMap ti) "")
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--(QErrM m, CacheRWM m, MonadTx m, MonadIO m)
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subTableP2Setup
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:: (QErrM m, CacheRWM m, MonadIO m)
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=> QualifiedTable -> TriggerId -> EventTriggerConf -> m ()
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subTableP2Setup qt trid (EventTriggerConf name def webhook webhookFromEnv rconf mheaders) = do
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webhookConf <- case (webhook, webhookFromEnv) of
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(Just w, Nothing) -> return $ WCValue w
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(Nothing, Just wEnv) -> return $ WCEnv wEnv
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_ -> throw500 "expected webhook or webhook_from_env"
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let headerConfs = fromMaybe [] mheaders
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webhookInfo <- getWebhookInfoFromConf webhookConf
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headerInfos <- getHeaderInfosFromConf headerConfs
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let eTrigInfo = EventTriggerInfo trid name def rconf webhookInfo headerInfos
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tabDep = SchemaDependency (SOTable qt) "parent"
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addEventTriggerToCache qt eTrigInfo (tabDep:getTrigDefDeps qt def)
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getTrigDefDeps :: QualifiedTable -> TriggerOpsDef -> [SchemaDependency]
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getTrigDefDeps qt (TriggerOpsDef mIns mUpd mDel) =
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mconcat $ catMaybes [ subsOpSpecDeps <$> mIns
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, subsOpSpecDeps <$> mUpd
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, subsOpSpecDeps <$> mDel
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]
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where
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subsOpSpecDeps :: SubscribeOpSpec -> [SchemaDependency]
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subsOpSpecDeps os =
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let cols = getColsFromSub $ sosColumns os
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colDeps = flip map cols $ \col ->
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SchemaDependency (SOTableObj qt (TOCol col)) "column"
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payload = maybe [] getColsFromSub (sosPayload os)
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payloadDeps = flip map payload $ \col ->
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SchemaDependency (SOTableObj qt (TOCol col)) "payload"
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in colDeps <> payloadDeps
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getColsFromSub sc = case sc of
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SubCStar -> []
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SubCArray pgcols -> pgcols
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subTableP2
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:: (QErrM m, CacheRWM m, MonadTx m, MonadIO m, HasSQLGenCtx m)
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=> QualifiedTable -> Bool -> EventTriggerConf -> m ()
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subTableP2 qt replace etc = do
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allCols <- getCols . tiFieldInfoMap <$> askTabInfo qt
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strfyNum <- stringifyNum <$> askSQLGenCtx
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trid <- if replace
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then do
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delEventTriggerFromCache qt (etcName etc)
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liftTx $ updateEventTriggerToCatalog qt allCols strfyNum etc
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else
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liftTx $ addEventTriggerToCatalog qt allCols strfyNum etc
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subTableP2Setup qt trid etc
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runCreateEventTriggerQuery
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:: (QErrM m, UserInfoM m, CacheRWM m, MonadTx m, MonadIO m, HasSQLGenCtx m)
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=> CreateEventTriggerQuery -> m RespBody
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runCreateEventTriggerQuery q = do
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(qt, replace, etc) <- subTableP1 q
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subTableP2 qt replace etc
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return successMsg
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unsubTableP1
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:: (UserInfoM m, QErrM m, CacheRM m)
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=> DeleteEventTriggerQuery -> m QualifiedTable
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unsubTableP1 (DeleteEventTriggerQuery name) = do
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adminOnly
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ti <- askTabInfoFromTrigger name
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return $ tiName ti
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unsubTableP2
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:: (QErrM m, CacheRWM m, MonadTx m)
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=> DeleteEventTriggerQuery -> QualifiedTable -> m RespBody
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unsubTableP2 (DeleteEventTriggerQuery name) qt = do
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delEventTriggerFromCache qt name
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liftTx $ delEventTriggerFromCatalog name
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return successMsg
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runDeleteEventTriggerQuery
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:: (QErrM m, UserInfoM m, CacheRWM m, MonadTx m)
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=> DeleteEventTriggerQuery -> m RespBody
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runDeleteEventTriggerQuery q =
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unsubTableP1 q >>= unsubTableP2 q
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deliverEvent
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:: (QErrM m, MonadTx m)
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=> DeliverEventQuery -> m RespBody
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deliverEvent (DeliverEventQuery eventId) = do
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_ <- liftTx $ fetchEvent eventId
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liftTx $ markForDelivery eventId
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return successMsg
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runDeliverEvent
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:: (QErrM m, UserInfoM m, MonadTx m)
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=> DeliverEventQuery -> m RespBody
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runDeliverEvent q =
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adminOnly >> deliverEvent q
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getHeaderInfosFromConf
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:: (QErrM m, MonadIO m)
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=> [HeaderConf] -> m [EventHeaderInfo]
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getHeaderInfosFromConf = mapM getHeader
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where
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getHeader :: (QErrM m, MonadIO m) => HeaderConf -> m EventHeaderInfo
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getHeader hconf = case hconf of
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(HeaderConf _ (HVValue val)) -> return $ EventHeaderInfo hconf val
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(HeaderConf _ (HVEnv val)) -> do
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envVal <- getEnv val
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return $ EventHeaderInfo hconf envVal
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getWebhookInfoFromConf
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:: (QErrM m, MonadIO m) => WebhookConf -> m WebhookConfInfo
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getWebhookInfoFromConf wc = case wc of
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WCValue w -> return $ WebhookConfInfo wc w
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WCEnv we -> do
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envVal <- getEnv we
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return $ WebhookConfInfo wc envVal
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getEnv :: (QErrM m, MonadIO m) => T.Text -> m T.Text
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getEnv env = do
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mEnv <- liftIO $ lookupEnv (T.unpack env)
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case mEnv of
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Nothing -> throw400 NotFound $ "environment variable '" <> env <> "' not set"
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Just envVal -> return (T.pack envVal)
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