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https://github.com/hasura/graphql-engine.git
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da8f6981d4
Fixes https://github.com/hasura/graphql-engine-mono/issues/712 Main point of interest: the `Hasura.SQL.Backend` module. This PR creates an `Exists` type indexed by indexed type and packed constraint while hiding all of its complexity by not exporting the constructor. Existential constructors/types which are no longer (directly) existential: - [X] BackendSourceInfo :: BackendSourceInfo - [x] BackendSourceMetadata :: BackendSourceMetadata - [x] MOSourceObjId :: MetadatObjId - [x] SOSourceObj :: SchemaObjId - [x] RFDB :: RootField - [x] LQP :: LiveQueryPlan - [x] ExecutionStep :: ExecStepDB This PR also removes ALL usages of `Typeable.cast` from our codebase. We still need to derive `Typeable` in a few places in order to be able to derive `Data` in one place. I have not dug deeper to see why this is needed. GitOrigin-RevId: bb47e957192e4bb0af4c4116aee7bb92f7983445
520 lines
21 KiB
Haskell
520 lines
21 KiB
Haskell
{-# LANGUAGE AllowAmbiguousTypes #-}
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{-# LANGUAGE Arrows #-}
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-- | Description: Create/delete SQL tables to/from Hasura metadata.
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module Hasura.RQL.DDL.Schema.Table
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( TrackTable(..)
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, runTrackTableQ
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, TrackTableV2(..)
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, runTrackTableV2Q
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, UntrackTable(..)
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, runUntrackTableQ
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, dropTableInMetadata
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, SetTableIsEnum(..)
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, runSetExistingTableIsEnumQ
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, SetTableCustomFields(..)
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, runSetTableCustomFieldsQV2
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, SetTableCustomization(..)
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, runSetTableCustomization
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, buildTableCache
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, checkConflictingNode
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) where
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import Hasura.Prelude
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import qualified Data.HashMap.Strict.Extended as Map
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import qualified Data.HashMap.Strict.InsOrd as OMap
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import qualified Data.HashSet as S
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import qualified Language.GraphQL.Draft.Syntax as G
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import Control.Arrow.Extended
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import Control.Lens.Extended hiding ((.=))
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import Control.Monad.Trans.Control (MonadBaseControl)
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import Data.Aeson
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import Data.Aeson.TH
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import Data.Text.Extended
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import qualified Hasura.Incremental as Inc
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import qualified Hasura.SQL.AnyBackend as AB
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import Hasura.Backends.Postgres.SQL.Types (QualifiedTable)
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import Hasura.EncJSON
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import Hasura.GraphQL.Context
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import Hasura.GraphQL.Schema.Common (textToName)
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import Hasura.RQL.DDL.Deps
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import Hasura.RQL.DDL.Schema.Cache.Common
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import Hasura.RQL.DDL.Schema.Common
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import Hasura.RQL.DDL.Schema.Enum (resolveEnumReferences)
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import Hasura.RQL.Types hiding (fmFunction)
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import Hasura.Server.Utils
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data TrackTable b
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= TrackTable
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{ tSource :: !SourceName
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, tName :: !(TableName b)
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, tIsEnum :: !Bool
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}
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deriving instance (Backend b) => Show (TrackTable b)
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deriving instance (Backend b) => Eq (TrackTable b)
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instance (Backend b) => FromJSON (TrackTable b) where
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parseJSON v = withOptions <|> withoutOptions
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where
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withOptions = flip (withObject "TrackTable") v $ \o -> TrackTable
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<$> o .:? "source" .!= defaultSource
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<*> o .: "table"
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<*> o .:? "is_enum" .!= False
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withoutOptions = TrackTable defaultSource <$> parseJSON v <*> pure False
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instance (Backend b) => ToJSON (TrackTable b) where
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toJSON (TrackTable source name isEnum)
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| isEnum = object [ "source" .= source, "table" .= name, "is_enum" .= isEnum ]
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| otherwise = toJSON name
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data SetTableIsEnum
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= SetTableIsEnum
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{ stieSource :: !SourceName
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, stieTable :: !QualifiedTable
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, stieIsEnum :: !Bool
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} deriving (Show, Eq)
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$(deriveToJSON hasuraJSON ''SetTableIsEnum)
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instance FromJSON SetTableIsEnum where
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parseJSON = withObject "Object" $ \o ->
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SetTableIsEnum
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<$> o .:? "source" .!= defaultSource
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<*> o .: "table"
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<*> o .: "is_enum"
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data UntrackTable b =
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UntrackTable
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{ utSource :: !SourceName
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, utTable :: !(TableName b)
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, utCascade :: !Bool
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} deriving (Generic)
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deriving instance (Backend b) => Show (UntrackTable b)
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deriving instance (Backend b) => Eq (UntrackTable b)
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instance (Backend b) => ToJSON (UntrackTable b) where
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toJSON = genericToJSON hasuraJSON{omitNothingFields=True}
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instance (Backend b) => FromJSON (UntrackTable b) where
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parseJSON = withObject "Object" $ \o ->
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UntrackTable
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<$> o .:? "source" .!= defaultSource
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<*> o .: "table"
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<*> o .:? "cascade" .!= False
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isTableTracked :: forall b. (Backend b) => SourceInfo b -> TableName b -> Bool
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isTableTracked sourceInfo tableName =
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isJust $ Map.lookup tableName $ _siTables sourceInfo
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-- | Track table/view, Phase 1:
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-- Validate table tracking operation. Fails if table is already being tracked,
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-- or if a function with the same name is being tracked.
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trackExistingTableOrViewP1 :: forall m b. (QErrM m, CacheRWM m, Backend b, MetadataM m) => SourceName -> TableName b -> m ()
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trackExistingTableOrViewP1 source tableName = do
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sourceInfo <- askSourceInfo source
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when (isTableTracked sourceInfo tableName) $
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throw400 AlreadyTracked $ "view/table already tracked : " <>> tableName
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let functionName = tableToFunction tableName
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when (isJust $ Map.lookup functionName $ _siFunctions sourceInfo) $
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throw400 NotSupported $ "function with name " <> tableName <<> " already exists"
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-- | Check whether a given name would conflict with the current schema by doing
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-- an internal introspection
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checkConflictingNode
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:: forall m. MonadError QErr m
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=> SchemaCache
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-> Text
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-> m ()
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checkConflictingNode sc tnGQL = do
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let GQLContext queryParser _ = scUnauthenticatedGQLContext sc
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-- {
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-- __schema {
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-- queryType {
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-- fields {
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-- name
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-- }
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-- }
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-- }
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-- }
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introspectionQuery =
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[ G.SelectionField $ G.Field Nothing $$(G.litName "__schema") mempty []
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[ G.SelectionField $ G.Field Nothing $$(G.litName "queryType") mempty []
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[ G.SelectionField $ G.Field Nothing $$(G.litName "fields") mempty []
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[ G.SelectionField $ G.Field Nothing $$(G.litName "name") mempty []
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[]
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]
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]
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]
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]
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case queryParser introspectionQuery of
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Left _ -> pure ()
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Right (results, _reusability) -> do
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case OMap.lookup $$(G.litName "__schema") results of
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Just (RFRaw (Object schema)) -> do
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let names = do
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Object queryType <- Map.lookup "queryType" schema
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Array fields <- Map.lookup "fields" queryType
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traverse (\case Object field -> do
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String name <- Map.lookup "name" field
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pure name
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_ -> Nothing) fields
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case names of
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Nothing -> pure ()
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Just ns ->
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if tnGQL `elem` ns
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then throw400 RemoteSchemaConflicts $
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"node " <> tnGQL <>
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" already exists in current graphql schema"
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else pure ()
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_ -> pure ()
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trackExistingTableOrViewP2
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:: forall m b
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. (MonadError QErr m, CacheRWM m, MetadataM m, BackendMetadata b)
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=> SourceName -> TableName b -> Bool -> TableConfig b -> m EncJSON
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trackExistingTableOrViewP2 source tableName isEnum config = do
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sc <- askSchemaCache
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{-
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The next line does more than what it says on the tin. Removing the following
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call to 'checkConflictingNode' causes memory usage to spike when newly
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tracking a large amount (~100) of tables. The memory usage can be triggered
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by first creating a large amount of tables through SQL, without tracking the
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tables, and then clicking "track all" in the console. Curiously, this high
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memory usage happens even when no substantial GraphQL schema is generated.
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-}
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checkConflictingNode sc $ snakeCaseTableName tableName
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let metadata = mkTableMeta tableName isEnum config
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buildSchemaCacheFor
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(MOSourceObjId source
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$ AB.mkAnyBackend
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$ SMOTable tableName)
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$ MetadataModifier
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$ metaSources.ix source.toSourceMetadata.smTables %~ OMap.insert tableName metadata
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pure successMsg
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runTrackTableQ
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:: (MonadError QErr m, CacheRWM m, MetadataM m, BackendMetadata b) => TrackTable b -> m EncJSON
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runTrackTableQ (TrackTable source qt isEnum) = do
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trackExistingTableOrViewP1 source qt
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trackExistingTableOrViewP2 source qt isEnum emptyTableConfig
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data TrackTableV2 b
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= TrackTableV2
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{ ttv2Table :: !(TrackTable b)
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, ttv2Configuration :: !(TableConfig b)
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} deriving (Show, Eq, Generic)
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instance (Backend b) => ToJSON (TrackTableV2 b) where
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toJSON = genericToJSON hasuraJSON
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instance (Backend b) => FromJSON (TrackTableV2 b) where
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parseJSON = withObject "Object" $ \o -> do
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table <- parseJSON $ Object o
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configuration <- o .:? "configuration" .!= emptyTableConfig
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pure $ TrackTableV2 table configuration
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runTrackTableV2Q
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:: (MonadError QErr m, CacheRWM m, MetadataM m, BackendMetadata b) => TrackTableV2 b -> m EncJSON
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runTrackTableV2Q (TrackTableV2 (TrackTable source qt isEnum) config) = do
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trackExistingTableOrViewP1 source qt
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trackExistingTableOrViewP2 source qt isEnum config
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runSetExistingTableIsEnumQ :: (MonadError QErr m, CacheRWM m, MetadataM m) => SetTableIsEnum -> m EncJSON
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runSetExistingTableIsEnumQ (SetTableIsEnum source tableName isEnum) = do
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void $ askTabInfo source tableName -- assert that table is tracked
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buildSchemaCacheFor
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(MOSourceObjId source $ AB.mkAnyBackend $ SMOTable tableName)
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$ MetadataModifier
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$ tableMetadataSetter source tableName.tmIsEnum .~ isEnum
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return successMsg
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data SetTableCustomization
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= SetTableCustomization
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{ _stcSource :: !SourceName
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, _stcTable :: !QualifiedTable
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, _stcConfiguration :: !(TableConfig 'Postgres)
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} deriving (Show, Eq)
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$(deriveToJSON hasuraJSON ''SetTableCustomization)
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instance FromJSON SetTableCustomization where
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parseJSON = withObject "Object" $ \o ->
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SetTableCustomization
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<$> o .:? "source" .!= defaultSource
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<*> o .: "table"
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<*> o .: "configuration"
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data SetTableCustomFields
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= SetTableCustomFields
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{ _stcfSource :: !SourceName
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, _stcfTable :: !QualifiedTable
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, _stcfCustomRootFields :: !TableCustomRootFields
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, _stcfCustomColumnNames :: !(CustomColumnNames 'Postgres)
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} deriving (Show, Eq)
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$(deriveToJSON hasuraJSON ''SetTableCustomFields)
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instance FromJSON SetTableCustomFields where
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parseJSON = withObject "SetTableCustomFields" $ \o ->
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SetTableCustomFields
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<$> o .:? "source" .!= defaultSource
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<*> o .: "table"
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<*> o .:? "custom_root_fields" .!= emptyCustomRootFields
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<*> o .:? "custom_column_names" .!= Map.empty
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runSetTableCustomFieldsQV2
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:: (QErrM m, CacheRWM m, MetadataM m) => SetTableCustomFields -> m EncJSON
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runSetTableCustomFieldsQV2 (SetTableCustomFields source tableName rootFields columnNames) = do
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void $ askTabInfo source tableName -- assert that table is tracked
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let tableConfig = TableConfig rootFields columnNames Nothing
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buildSchemaCacheFor
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(MOSourceObjId source $ AB.mkAnyBackend $ SMOTable tableName)
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$ MetadataModifier
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$ tableMetadataSetter source tableName.tmConfiguration .~ tableConfig
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return successMsg
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runSetTableCustomization
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:: (QErrM m, CacheRWM m, MetadataM m) => SetTableCustomization -> m EncJSON
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runSetTableCustomization (SetTableCustomization source table config) = do
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void $ askTabInfo source table
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buildSchemaCacheFor
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(MOSourceObjId source $ AB.mkAnyBackend $ SMOTable table)
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$ MetadataModifier
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$ tableMetadataSetter source table.tmConfiguration .~ config
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return successMsg
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unTrackExistingTableOrViewP1
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:: forall m b. (CacheRM m, QErrM m, Backend b) => UntrackTable b -> m ()
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unTrackExistingTableOrViewP1 (UntrackTable source vn _) = do
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schemaCache <- askSchemaCache
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tableInfo <- unsafeTableInfo @b source vn (scSources schemaCache)
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`onNothing` throw400 AlreadyUntracked ("view/table already untracked : " <>> vn)
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when (isSystemDefined $ _tciSystemDefined $ _tiCoreInfo tableInfo) $
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throw400 NotSupported $ vn <<> " is system defined, cannot untrack"
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unTrackExistingTableOrViewP2
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:: forall m b
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. (CacheRWM m, QErrM m, MetadataM m, BackendMetadata b)
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=> UntrackTable b -> m EncJSON
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unTrackExistingTableOrViewP2 (UntrackTable source qtn cascade) = withNewInconsistentObjsCheck do
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sc <- askSchemaCache
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-- Get relational, query template and function dependants
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let allDeps =
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getDependentObjs
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sc
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(SOSourceObj source $ AB.mkAnyBackend $ SOITable qtn)
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indirectDeps = mapMaybe getIndirectDep allDeps
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-- Report bach with an error if cascade is not set
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when (indirectDeps /= [] && not cascade)
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$ reportDepsExt
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(map (SOSourceObj source . AB.mkAnyBackend) indirectDeps)
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[]
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-- Purge all the dependents from state
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metadataModifier <- execWriterT do
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mapM_ (purgeDependentObject source >=> tell) indirectDeps
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tell $ dropTableInMetadata source qtn
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-- delete the table and its direct dependencies
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buildSchemaCache metadataModifier
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pure successMsg
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where
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getIndirectDep :: SchemaObjId -> Maybe (SourceObjId b)
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getIndirectDep = \case
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SOSourceObj s exists ->
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-- If the dependency is to any other source, it automatically is an
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-- indirect dependency, hence the cast is safe here. However, we don't
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-- have these cross source dependencies yet
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AB.unpackAnyBackend exists >>= \case
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v@(SOITableObj dtn _) ->
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if not (s == source && qtn == dtn) then Just v else Nothing
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v -> Just v
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_ -> Nothing
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dropTableInMetadata :: (BackendMetadata b) => SourceName -> TableName b -> MetadataModifier
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dropTableInMetadata source table =
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MetadataModifier $ metaSources.ix source.toSourceMetadata.smTables %~ OMap.delete table
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runUntrackTableQ
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:: (CacheRWM m, QErrM m, MetadataM m, BackendMetadata b)
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=> UntrackTable b -> m EncJSON
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runUntrackTableQ q = do
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unTrackExistingTableOrViewP1 q
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unTrackExistingTableOrViewP2 q
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-- | Builds an initial @'TableCache' 'ColumnInfo'@ from catalog information. Does not fill in
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-- '_tiRolePermInfoMap' or '_tiEventTriggerInfoMap' at all, and '_tiFieldInfoMap' only contains
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-- columns, not relationships; those pieces of information are filled in by later stages.
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buildTableCache
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:: forall arr m b
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. ( ArrowChoice arr, Inc.ArrowDistribute arr, ArrowWriter (Seq CollectedInfo) arr
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, Inc.ArrowCache m arr, MonadIO m, MonadBaseControl IO m, BackendMetadata b
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)
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=> ( SourceName
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, SourceConfig b
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, DBTablesMetadata b
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, [TableBuildInput b]
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, Inc.Dependency Inc.InvalidationKey
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) `arr` Map.HashMap (TableName b) (TableCoreInfoG b (ColumnInfo b) (ColumnInfo b))
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buildTableCache = Inc.cache proc (source, sourceConfig, dbTablesMeta, tableBuildInputs, reloadMetadataInvalidationKey) -> do
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rawTableInfos <-
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(| Inc.keyed (| withTable (\tables -> do
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table <- noDuplicateTables -< tables
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let maybeInfo = Map.lookup (_tbiName table) dbTablesMeta
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buildRawTableInfo -< (table, maybeInfo, sourceConfig, reloadMetadataInvalidationKey)
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)
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|)
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|) (withSourceInKey source $ Map.groupOnNE _tbiName tableBuildInputs)
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let rawTableCache = removeSourceInKey $ Map.catMaybes rawTableInfos
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enumTables = flip Map.mapMaybe rawTableCache \rawTableInfo ->
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(,) <$> _tciPrimaryKey rawTableInfo <*> _tciEnumValues rawTableInfo
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tableInfos <-
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(| Inc.keyed (| withTable (\table -> processTableInfo -< (enumTables, table)) |)
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|) (withSourceInKey source rawTableCache)
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returnA -< removeSourceInKey (Map.catMaybes tableInfos)
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where
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withSourceInKey :: (Eq k, Hashable k) => SourceName -> HashMap k v -> HashMap (SourceName, k) v
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withSourceInKey source = mapKeys (source,)
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removeSourceInKey :: (Eq k, Hashable k) => HashMap (SourceName, k) v -> HashMap k v
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removeSourceInKey = mapKeys snd
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withTable :: ErrorA QErr arr (e, s) a -> arr (e, ((SourceName, TableName b), s)) (Maybe a)
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withTable f = withRecordInconsistency f <<<
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second (first $ arr \(source, name) ->
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MetadataObject
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(MOSourceObjId source
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$ AB.mkAnyBackend
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$ SMOTable name)
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(toJSON name))
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noDuplicateTables = proc tables -> case tables of
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table :| [] -> returnA -< table
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_ -> throwA -< err400 AlreadyExists "duplication definition for table"
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-- Step 1: Build the raw table cache from metadata information.
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buildRawTableInfo
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:: ErrorA QErr arr
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( TableBuildInput b
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, Maybe (DBTableMetadata b)
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, SourceConfig b
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, Inc.Dependency Inc.InvalidationKey
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) (TableCoreInfoG b (RawColumnInfo b) (Column b))
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buildRawTableInfo = Inc.cache proc (tableBuildInput, maybeInfo, sourceConfig, reloadMetadataInvalidationKey) -> do
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let TableBuildInput name isEnum config = tableBuildInput
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metadataTable <-
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(| onNothingA (throwA -<
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err400 NotExists $ "no such table/view exists in source: " <>> name)
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|) maybeInfo
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let columns :: [RawColumnInfo b] = _ptmiColumns metadataTable
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columnMap = mapFromL (FieldName . toTxt . prciName) columns
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primaryKey = _ptmiPrimaryKey metadataTable
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rawPrimaryKey <- liftEitherA -< traverse (resolvePrimaryKeyColumns columnMap) primaryKey
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enumValues <- if isEnum
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then do
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-- We want to make sure we reload enum values whenever someone explicitly calls
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-- `reload_metadata`.
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Inc.dependOn -< reloadMetadataInvalidationKey
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eitherEnums <- bindA -< fetchAndValidateEnumValues sourceConfig name rawPrimaryKey columns
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liftEitherA -< Just <$> eitherEnums
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else returnA -< Nothing
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returnA -< TableCoreInfo
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{ _tciName = name
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, _tciSystemDefined = SystemDefined False
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, _tciFieldInfoMap = columnMap
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, _tciPrimaryKey = primaryKey
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, _tciUniqueConstraints = _ptmiUniqueConstraints metadataTable
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, _tciForeignKeys = S.map unForeignKeyMetadata $ _ptmiForeignKeys metadataTable
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, _tciViewInfo = _ptmiViewInfo metadataTable
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, _tciEnumValues = enumValues
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, _tciCustomConfig = config
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, _tciDescription = _ptmiDescription metadataTable
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}
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-- Step 2: Process the raw table cache to replace Postgres column types with logical column
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-- types.
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processTableInfo
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:: ErrorA QErr arr
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( Map.HashMap (TableName b) (PrimaryKey b (Column b), EnumValues)
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, TableCoreInfoG b (RawColumnInfo b) (Column b)
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) (TableCoreInfoG b (ColumnInfo b) (ColumnInfo b))
|
||
processTableInfo = proc (enumTables, rawInfo) -> liftEitherA -< do
|
||
let columns = _tciFieldInfoMap rawInfo
|
||
enumReferences = resolveEnumReferences enumTables (_tciForeignKeys rawInfo)
|
||
columnInfoMap <-
|
||
alignCustomColumnNames columns (_tcCustomColumnNames $ _tciCustomConfig rawInfo)
|
||
>>= traverse (processColumnInfo enumReferences (_tciName rawInfo))
|
||
assertNoDuplicateFieldNames (Map.elems columnInfoMap)
|
||
|
||
primaryKey <- traverse (resolvePrimaryKeyColumns columnInfoMap) (_tciPrimaryKey rawInfo)
|
||
pure rawInfo
|
||
{ _tciFieldInfoMap = columnInfoMap
|
||
, _tciPrimaryKey = primaryKey
|
||
}
|
||
|
||
resolvePrimaryKeyColumns
|
||
:: forall n a . (QErrM n) => HashMap FieldName a -> PrimaryKey b (Column b) -> n (PrimaryKey b a)
|
||
resolvePrimaryKeyColumns columnMap = traverseOf (pkColumns.traverse) \columnName ->
|
||
Map.lookup (FieldName (toTxt columnName)) columnMap
|
||
`onNothing` throw500 "column in primary key not in table!"
|
||
|
||
alignCustomColumnNames
|
||
:: (QErrM n)
|
||
=> FieldInfoMap (RawColumnInfo b)
|
||
-> CustomColumnNames b
|
||
-> n (FieldInfoMap (RawColumnInfo b, G.Name))
|
||
alignCustomColumnNames columns customNames = do
|
||
let customNamesByFieldName = mapKeys (fromCol @b) customNames
|
||
flip Map.traverseWithKey (align columns customNamesByFieldName) \columnName -> \case
|
||
This column -> (column,) <$> textToName (getFieldNameTxt columnName)
|
||
These column customName -> pure (column, customName)
|
||
That customName -> throw400 NotExists $ "the custom field name " <> customName
|
||
<<> " was given for the column " <> columnName <<> ", but no such column exists"
|
||
|
||
-- | “Processes” a '(RawColumnInfo 'Postgres)' into a 'PGColumnInfo' by resolving its type using a map of
|
||
-- known enum tables.
|
||
processColumnInfo
|
||
:: (QErrM n)
|
||
=> Map.HashMap (Column b) (NonEmpty (EnumReference b))
|
||
-> TableName b -- ^ the table this column belongs to
|
||
-> (RawColumnInfo b, G.Name)
|
||
-> n (ColumnInfo b)
|
||
processColumnInfo tableEnumReferences tableName (rawInfo, name) = do
|
||
resolvedType <- resolveColumnType
|
||
pure ColumnInfo
|
||
{ pgiColumn = pgCol
|
||
, pgiName = name
|
||
, pgiPosition = prciPosition rawInfo
|
||
, pgiType = resolvedType
|
||
, pgiIsNullable = prciIsNullable rawInfo
|
||
, pgiDescription = prciDescription rawInfo
|
||
}
|
||
where
|
||
pgCol = prciName rawInfo
|
||
resolveColumnType =
|
||
case Map.lookup pgCol tableEnumReferences of
|
||
-- no references? not an enum
|
||
Nothing -> pure $ ColumnScalar (prciType rawInfo)
|
||
-- one reference? is an enum
|
||
Just (enumReference:|[]) -> pure $ ColumnEnumReference enumReference
|
||
-- multiple referenced enums? the schema is strange, so let’s reject it
|
||
Just enumReferences -> throw400 ConstraintViolation
|
||
$ "column " <> prciName rawInfo <<> " in table " <> tableName
|
||
<<> " references multiple enum tables ("
|
||
<> commaSeparated (map (dquote . erTable) $ toList enumReferences) <> ")"
|
||
|
||
assertNoDuplicateFieldNames columns =
|
||
flip Map.traverseWithKey (Map.groupOn pgiName columns) \name columnsWithName ->
|
||
case columnsWithName of
|
||
one:two:more -> throw400 AlreadyExists $ "the definitions of columns "
|
||
<> englishList "and" (dquote . pgiColumn <$> (one:|two:more))
|
||
<> " are in conflict: they are mapped to the same field name, " <>> name
|
||
_ -> pure ()
|