mirror of
https://github.com/hasura/graphql-engine.git
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457 lines
22 KiB
Haskell
457 lines
22 KiB
Haskell
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{-# LANGUAGE ApplicativeDo #-}
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{-# LANGUAGE ViewPatterns #-}
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module Hasura.Backends.Postgres.Schema.Select
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( selectFunction,
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selectFunctionAggregate,
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selectFunctionConnection,
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computedFieldPG,
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buildFunctionQueryFieldsPG,
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buildFunctionMutationFieldsPG,
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)
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where
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import Control.Lens hiding (index)
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import Data.HashMap.Strict.Extended qualified as Map
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import Data.Sequence qualified as Seq
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import Data.Text.Extended
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import Data.Traversable (mapAccumL)
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import Hasura.Backends.Postgres.SQL.Types qualified as PG
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import Hasura.Backends.Postgres.Types.ComputedField qualified as PG
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import Hasura.Backends.Postgres.Types.Function qualified as PG
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import Hasura.Base.Error
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import Hasura.GraphQL.Parser qualified as P
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import Hasura.GraphQL.Parser.Class
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import Hasura.GraphQL.Schema.Backend
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import Hasura.GraphQL.Schema.Common
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import Hasura.GraphQL.Schema.Parser
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( FieldParser,
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InputFieldsParser,
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)
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import Hasura.GraphQL.Schema.Select
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import Hasura.GraphQL.Schema.Table
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import Hasura.Name qualified as Name
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import Hasura.Prelude
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import Hasura.RQL.IR
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import Hasura.RQL.IR qualified as IR
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import Hasura.RQL.Types.Backend
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import Hasura.RQL.Types.Column
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import Hasura.RQL.Types.Common
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import Hasura.RQL.Types.ComputedField
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import Hasura.RQL.Types.Function
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import Hasura.RQL.Types.SchemaCache hiding (askTableInfo)
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import Hasura.RQL.Types.Source
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import Hasura.RQL.Types.SourceCustomization (mkRootFieldName)
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import Hasura.RQL.Types.Table
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import Hasura.SQL.Backend
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import Language.GraphQL.Draft.Syntax qualified as G
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-- | User-defined function (AKA custom function)
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selectFunction ::
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forall r m n pgKind.
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MonadBuildSchema ('Postgres pgKind) r m n =>
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-- | source name
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SourceInfo ('Postgres pgKind) ->
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-- | SQL function info
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FunctionInfo ('Postgres pgKind) ->
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-- | field description, if any
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Maybe G.Description ->
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m (Maybe (FieldParser n (SelectExp ('Postgres pgKind))))
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selectFunction sourceInfo fi@FunctionInfo {..} description = runMaybeT do
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tableInfo <- lift $ askTableInfo sourceInfo _fiReturnType
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selectPermissions <- MaybeT $ tableSelectPermissions tableInfo
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selectionSetParser <- MaybeT $ returnFunctionParser sourceInfo tableInfo
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lift do
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stringifyNum <- retrieve soStringifyNum
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tableArgsParser <- tableArguments sourceInfo tableInfo
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functionArgsParser <- customSQLFunctionArgs sourceInfo fi _fiGQLName _fiGQLArgsName
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let argsParser = liftA2 (,) functionArgsParser tableArgsParser
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functionFieldName <- mkRootFieldName _fiGQLName
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pure $
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P.subselection functionFieldName description argsParser selectionSetParser
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<&> \((funcArgs, tableArgs'), fields) ->
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IR.AnnSelectG
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{ IR._asnFields = fields,
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IR._asnFrom = IR.FromFunction _fiSQLName funcArgs Nothing,
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IR._asnPerm = tablePermissionsInfo selectPermissions,
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IR._asnArgs = tableArgs',
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IR._asnStrfyNum = stringifyNum
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}
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where
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returnFunctionParser =
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case _fiJsonAggSelect of
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JASSingleObject -> tableSelectionSet
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JASMultipleRows -> tableSelectionList
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selectFunctionAggregate ::
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forall r m n pgKind.
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MonadBuildSchema ('Postgres pgKind) r m n =>
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-- | source name
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SourceInfo ('Postgres pgKind) ->
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-- | SQL function info
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FunctionInfo ('Postgres pgKind) ->
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-- | field description, if any
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Maybe G.Description ->
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m (Maybe (FieldParser n (AggSelectExp ('Postgres pgKind))))
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selectFunctionAggregate sourceInfo fi@FunctionInfo {..} description = runMaybeT do
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targetTableInfo <- askTableInfo sourceInfo _fiReturnType
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selectPermissions <- MaybeT $ tableSelectPermissions targetTableInfo
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guard $ spiAllowAgg selectPermissions
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xNodesAgg <- hoistMaybe $ nodesAggExtension @('Postgres pgKind)
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tableInfo <- askTableInfo sourceInfo _fiReturnType
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nodesParser <- MaybeT $ tableSelectionList sourceInfo tableInfo
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lift do
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stringifyNum <- retrieve soStringifyNum
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tableGQLName <- getTableGQLName tableInfo
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tableArgsParser <- tableArguments sourceInfo tableInfo
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functionArgsParser <- customSQLFunctionArgs sourceInfo fi _fiGQLAggregateName _fiGQLArgsName
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aggregateParser <- tableAggregationFields sourceInfo tableInfo
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selectionName <- P.mkTypename =<< pure (tableGQLName <> Name.__aggregate)
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aggregateFieldName <- mkRootFieldName _fiGQLAggregateName
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let argsParser = liftA2 (,) functionArgsParser tableArgsParser
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aggregationParser =
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fmap (parsedSelectionsToFields IR.TAFExp) $
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P.nonNullableParser $
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P.selectionSet
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selectionName
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Nothing
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[ IR.TAFNodes xNodesAgg <$> P.subselection_ Name._nodes Nothing nodesParser,
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IR.TAFAgg <$> P.subselection_ Name._aggregate Nothing aggregateParser
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]
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pure $
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P.subselection aggregateFieldName description argsParser aggregationParser
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<&> \((funcArgs, tableArgs'), fields) ->
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IR.AnnSelectG
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{ IR._asnFields = fields,
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IR._asnFrom = IR.FromFunction _fiSQLName funcArgs Nothing,
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IR._asnPerm = tablePermissionsInfo selectPermissions,
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IR._asnArgs = tableArgs',
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IR._asnStrfyNum = stringifyNum
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}
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selectFunctionConnection ::
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forall pgKind r m n.
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MonadBuildSchema ('Postgres pgKind) r m n =>
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-- | source name
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SourceInfo ('Postgres pgKind) ->
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-- | SQL function info
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FunctionInfo ('Postgres pgKind) ->
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-- | field description, if any
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Maybe G.Description ->
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-- | primary key columns of the target table
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PrimaryKeyColumns ('Postgres pgKind) ->
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m (Maybe (FieldParser n (ConnectionSelectExp ('Postgres pgKind))))
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selectFunctionConnection sourceInfo fi@FunctionInfo {..} description pkeyColumns = runMaybeT do
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returnTableInfo <- lift $ askTableInfo sourceInfo _fiReturnType
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selectPermissions <- MaybeT $ tableSelectPermissions returnTableInfo
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xRelayInfo <- hoistMaybe $ relayExtension @('Postgres pgKind)
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tableInfo <- lift $ askTableInfo sourceInfo _fiReturnType
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selectionSetParser <- MaybeT $ tableConnectionSelectionSet sourceInfo tableInfo
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lift do
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fieldName <- mkRootFieldName $ _fiGQLName <> Name.__connection
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stringifyNum <- retrieve soStringifyNum
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tableConnectionArgsParser <- tableConnectionArgs pkeyColumns sourceInfo tableInfo
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functionArgsParser <- customSQLFunctionArgs sourceInfo fi _fiGQLName _fiGQLArgsName
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let argsParser = liftA2 (,) functionArgsParser tableConnectionArgsParser
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pure $
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P.subselection fieldName description argsParser selectionSetParser
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<&> \((funcArgs, (args, split, slice)), fields) ->
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IR.ConnectionSelect
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{ IR._csXRelay = xRelayInfo,
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IR._csPrimaryKeyColumns = pkeyColumns,
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IR._csSplit = split,
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IR._csSlice = slice,
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IR._csSelect =
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IR.AnnSelectG
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{ IR._asnFields = fields,
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IR._asnFrom = IR.FromFunction _fiSQLName funcArgs Nothing,
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IR._asnPerm = tablePermissionsInfo selectPermissions,
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IR._asnArgs = args,
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IR._asnStrfyNum = stringifyNum
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}
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}
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-- | Computed field parser
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computedFieldPG ::
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forall pgKind r m n.
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MonadBuildSchema ('Postgres pgKind) r m n =>
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SourceInfo ('Postgres pgKind) ->
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ComputedFieldInfo ('Postgres pgKind) ->
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TableName ('Postgres pgKind) ->
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TableInfo ('Postgres pgKind) ->
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m (Maybe (FieldParser n (AnnotatedField ('Postgres pgKind))))
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computedFieldPG sourceInfo ComputedFieldInfo {..} parentTable tableInfo = runMaybeT do
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selectPermissions <- MaybeT $ tableSelectPermissions tableInfo
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stringifyNum <- retrieve soStringifyNum
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fieldName <- lift $ textToName $ computedFieldNameToText _cfiName
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functionArgsParser <- lift $ computedFieldFunctionArgs _cfiFunction
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case _cfiReturnType of
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PG.CFRScalar scalarReturnType -> do
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caseBoolExpMaybe <-
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hoistMaybe (Map.lookup _cfiName (spiComputedFields selectPermissions))
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let caseBoolExpUnpreparedValue =
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(fmap . fmap) partialSQLExpToUnpreparedValue <$> caseBoolExpMaybe
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fieldArgsParser = do
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args <- functionArgsParser
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colOp <- scalarSelectionArgumentsParser @('Postgres pgKind) $ ColumnScalar scalarReturnType
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pure $
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IR.AFComputedField
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_cfiXComputedFieldInfo
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_cfiName
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( IR.CFSScalar
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( IR.ComputedFieldScalarSelect
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{ IR._cfssFunction = _cffName _cfiFunction,
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IR._cfssType = scalarReturnType,
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IR._cfssScalarArguments = colOp,
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IR._cfssArguments = args
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}
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)
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caseBoolExpUnpreparedValue
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)
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dummyParser <- lift $ columnParser @('Postgres pgKind) (ColumnScalar scalarReturnType) (G.Nullability True)
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pure $ P.selection fieldName fieldDescription fieldArgsParser dummyParser
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PG.CFRSetofTable tableName -> do
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otherTableInfo <- lift $ askTableInfo sourceInfo tableName
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remotePerms <- MaybeT $ tableSelectPermissions otherTableInfo
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selectionSetParser <- MaybeT (fmap (P.multiple . P.nonNullableParser) <$> tableSelectionSet sourceInfo otherTableInfo)
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selectArgsParser <- lift $ tableArguments sourceInfo otherTableInfo
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let fieldArgsParser = liftA2 (,) functionArgsParser selectArgsParser
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pure $
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P.subselection fieldName fieldDescription fieldArgsParser selectionSetParser
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<&> \((functionArgs', args), fields) ->
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IR.AFComputedField _cfiXComputedFieldInfo _cfiName $
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IR.CFSTable JASMultipleRows $
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IR.AnnSelectG
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{ IR._asnFields = fields,
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IR._asnFrom = IR.FromFunction (_cffName _cfiFunction) functionArgs' Nothing,
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IR._asnPerm = tablePermissionsInfo remotePerms,
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IR._asnArgs = args,
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IR._asnStrfyNum = stringifyNum
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}
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where
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fieldDescription :: Maybe G.Description
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fieldDescription = G.Description <$> _cfiDescription
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computedFieldFunctionArgs ::
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ComputedFieldFunction ('Postgres pgKind) ->
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m (InputFieldsParser n (FunctionArgsExp ('Postgres pgKind) (IR.UnpreparedValue ('Postgres pgKind))))
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computedFieldFunctionArgs ComputedFieldFunction {..} =
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functionArgs sourceInfo (FTAComputedField _cfiName (_siName sourceInfo) parentTable) (IAUserProvided <$> _cffInputArgs)
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<&> fmap addTableAndSessionArgument
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where
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addTableAndSessionArgument args@(FunctionArgsExp positional named) =
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let withTable = case PG._cffaTableArgument _cffComputedFieldImplicitArgs of
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PG.FTAFirst -> FunctionArgsExp (PG.AETableRow : positional) named
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PG.FTANamed argName index -> IR.insertFunctionArg argName index PG.AETableRow args
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sessionArgVal = PG.AESession IR.UVSession
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in case PG._cffaSessionArgument _cffComputedFieldImplicitArgs of
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Nothing -> withTable
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Just (PG.FunctionSessionArgument argName index) ->
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IR.insertFunctionArg argName index sessionArgVal withTable
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-- | The custom SQL functions' input "args" field parser
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-- > function_name(args: function_args)
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customSQLFunctionArgs ::
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MonadBuildSchema ('Postgres pgKind) r m n =>
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SourceInfo ('Postgres pgKind) ->
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FunctionInfo ('Postgres pgKind) ->
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G.Name ->
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G.Name ->
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m (InputFieldsParser n (FunctionArgsExp ('Postgres pgKind) (IR.UnpreparedValue ('Postgres pgKind))))
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customSQLFunctionArgs sourceInfo FunctionInfo {..} functionName functionArgsName =
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functionArgs
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sourceInfo
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( FTACustomFunction $
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CustomFunctionNames
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{ cfnFunctionName = functionName,
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cfnArgsName = functionArgsName
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}
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)
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_fiInputArgs
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-- | Parses the arguments to the underlying sql function of a computed field or
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-- a custom function. All arguments to the underlying sql function are parsed
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-- as an "args" object. Named arguments are expected in a field with the same
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-- name, while positional arguments are expected in an field named "arg_$n".
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-- Note that collisions are possible, but ignored for now, if a named argument
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-- is also named "arg_$n". (FIXME: link to an issue?)
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--
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-- If the function requires no argument, or if its only argument is not
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-- user-provided (the session argument in the case of custom functions, the
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-- table row argument in the case of computed fields), the args object will
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-- be omitted.
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functionArgs ::
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forall r m n pgKind.
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MonadBuildSchema ('Postgres pgKind) r m n =>
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SourceInfo ('Postgres pgKind) ->
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FunctionTrackedAs ('Postgres pgKind) ->
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Seq.Seq (FunctionInputArgument ('Postgres pgKind)) ->
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m (InputFieldsParser n (FunctionArgsExp ('Postgres pgKind) (IR.UnpreparedValue ('Postgres pgKind))))
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functionArgs sourceInfo functionTrackedAs (toList -> inputArgs) = do
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-- First, we iterate through the original sql arguments in order, to find the
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-- corresponding graphql names. At the same time, we create the input field
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-- parsers, in three groups: session argument, optional arguments, and
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-- mandatory arguments. Optional arguments have a default value, mandatory
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-- arguments don't.
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let (names, session, optional, mandatory) = mconcat $ snd $ mapAccumL splitArguments 1 inputArgs
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defaultArguments = FunctionArgsExp (snd <$> session) Map.empty
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if
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| length session > 1 ->
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-- We somehow found more than one session argument; this should never
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-- happen and is an error on our side.
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throw500 "there shouldn't be more than one session argument"
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| null optional && null mandatory ->
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-- There are no user-provided arguments to the function: there will be
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-- no args field.
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pure $ pure defaultArguments
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| otherwise -> do
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-- There are user-provided arguments: we need to parse an args object.
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argumentParsers <- sequenceA $ optional <> mandatory
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objectName <-
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P.mkTypename
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=<< case functionTrackedAs of
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FTAComputedField computedFieldName _sourceName tableName -> do
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tableInfo <- askTableInfo sourceInfo tableName
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computedFieldGQLName <- textToName $ computedFieldNameToText computedFieldName
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tableGQLName <- getTableGQLName @('Postgres pgKind) tableInfo
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pure $ computedFieldGQLName <> Name.__ <> tableGQLName <> Name.__args
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FTACustomFunction (CustomFunctionNames {cfnArgsName}) ->
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pure cfnArgsName
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let fieldName = Name._args
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fieldDesc =
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case functionTrackedAs of
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FTAComputedField computedFieldName _sourceName tableName ->
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G.Description $
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"input parameters for computed field "
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<> computedFieldName <<> " defined on table " <>> tableName
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FTACustomFunction (CustomFunctionNames {cfnFunctionName}) ->
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G.Description $ "input parameters for function " <>> cfnFunctionName
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objectParser =
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P.object objectName Nothing (sequenceA argumentParsers) `P.bind` \arguments -> do
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-- After successfully parsing, we create a dictionary of the parsed fields
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-- and we re-iterate through the original list of sql arguments, now with
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-- the knowledge of their graphql name.
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let foundArguments = Map.fromList $ catMaybes arguments <> session
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argsWithNames = zip names inputArgs
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-- All elements (in the orignal sql order) that are found in the result map
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-- are treated as positional arguments, whether they were originally named or
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-- not.
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(positional, left) <- spanMaybeM (\(name, _) -> pure $ Map.lookup name foundArguments) argsWithNames
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-- If there are arguments left, it means we found one that was not passed
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-- positionally. As a result, any remaining argument will have to be passed
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-- by name. We fail with a parse error if we encounter a positional sql
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-- argument (that does not have a name in the sql function), as:
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-- * only the last positional arguments can be omitted;
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-- * it has no name we can use.
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-- We also fail if we find a mandatory argument that was not
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-- provided by the user.
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named <- Map.fromList . catMaybes <$> traverse (namedArgument foundArguments) left
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pure $ FunctionArgsExp positional named
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pure $ P.field fieldName (Just fieldDesc) objectParser
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where
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sessionPlaceholder :: PG.ArgumentExp (IR.UnpreparedValue b)
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sessionPlaceholder = PG.AEInput IR.UVSession
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splitArguments ::
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Int ->
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FunctionInputArgument ('Postgres pgKind) ->
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( Int,
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( [Text], -- graphql names, in order
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[(Text, PG.ArgumentExp (IR.UnpreparedValue ('Postgres pgKind)))], -- session argument
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[m (InputFieldsParser n (Maybe (Text, PG.ArgumentExp (IR.UnpreparedValue ('Postgres pgKind)))))], -- optional argument
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[m (InputFieldsParser n (Maybe (Text, PG.ArgumentExp (IR.UnpreparedValue ('Postgres pgKind)))))] -- mandatory argument
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)
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)
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splitArguments positionalIndex (IASessionVariables name) =
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let argName = getFuncArgNameTxt name
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in (positionalIndex, ([argName], [(argName, sessionPlaceholder)], [], []))
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splitArguments positionalIndex (IAUserProvided arg) =
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let (argName, newIndex) = case PG.faName arg of
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Nothing -> ("arg_" <> tshow positionalIndex, positionalIndex + 1)
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Just name -> (getFuncArgNameTxt name, positionalIndex)
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in if PG.unHasDefault $ PG.faHasDefault arg
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then (newIndex, ([argName], [], [parseArgument arg argName], []))
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else (newIndex, ([argName], [], [], [parseArgument arg argName]))
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parseArgument :: FunctionArgument ('Postgres pgKind) -> Text -> m (InputFieldsParser n (Maybe (Text, PG.ArgumentExp (IR.UnpreparedValue ('Postgres pgKind)))))
|
||
|
parseArgument arg name = do
|
||
|
typedParser <- columnParser (ColumnScalar $ PG.mkFunctionArgScalarType $ PG.faType arg) (G.Nullability True)
|
||
|
fieldName <- textToName name
|
||
|
|
||
|
-- Since all postgres function arguments are nullable, we define the
|
||
|
-- GraphQL fields in nullable types. As explained in Note [When are fields
|
||
|
-- optional?], this implies that they can be omitted. For backwards
|
||
|
-- compatibility reasons, and also to avoid surprises, we prefer to reject
|
||
|
-- the query if a mandatory argument is missing rather than filling the
|
||
|
-- blanks for the user.
|
||
|
--
|
||
|
-- As explained in Note [The value of omitted fields], we can still reject
|
||
|
-- queries when such nullable fields are omitted, and accept them when an
|
||
|
-- explicit value of `null` is used, as long as we don't set a default
|
||
|
-- value, not even `null`.
|
||
|
let argParser = P.fieldOptional fieldName Nothing typedParser
|
||
|
pure $ argParser `mapField` ((name,) . PG.AEInput . IR.mkParameter)
|
||
|
|
||
|
namedArgument ::
|
||
|
HashMap Text (PG.ArgumentExp (IR.UnpreparedValue ('Postgres pgKind))) ->
|
||
|
(Text, FunctionInputArgument ('Postgres pgKind)) ->
|
||
|
n (Maybe (Text, PG.ArgumentExp (IR.UnpreparedValue ('Postgres pgKind))))
|
||
|
namedArgument dictionary (name, inputArgument) = case inputArgument of
|
||
|
IASessionVariables _ -> pure $ Just (name, sessionPlaceholder)
|
||
|
IAUserProvided arg -> case Map.lookup name dictionary of
|
||
|
Just parsedValue -> case PG.faName arg of
|
||
|
Just _ -> pure $ Just (name, parsedValue)
|
||
|
Nothing -> parseErrorWith NotSupported "Only last set of positional arguments can be omitted"
|
||
|
Nothing ->
|
||
|
whenMaybe (not $ PG.unHasDefault $ PG.faHasDefault arg) $
|
||
|
parseErrorWith NotSupported "Non default arguments cannot be omitted"
|
||
|
|
||
|
buildFunctionQueryFieldsPG ::
|
||
|
forall r m n pgKind.
|
||
|
MonadBuildSchema ('Postgres pgKind) r m n =>
|
||
|
SourceInfo ('Postgres pgKind) ->
|
||
|
FunctionName ('Postgres pgKind) ->
|
||
|
FunctionInfo ('Postgres pgKind) ->
|
||
|
TableName ('Postgres pgKind) ->
|
||
|
m [FieldParser n (QueryDB ('Postgres pgKind) (RemoteRelationshipField UnpreparedValue) (UnpreparedValue ('Postgres pgKind)))]
|
||
|
buildFunctionQueryFieldsPG sourceInfo functionName functionInfo tableName = do
|
||
|
let -- select function
|
||
|
funcDesc =
|
||
|
Just . G.Description $
|
||
|
flip fromMaybe (_fiComment functionInfo) $ "execute function " <> functionName <<> " which returns " <>> tableName
|
||
|
-- select function agg
|
||
|
|
||
|
funcAggDesc = Just $ G.Description $ "execute function " <> functionName <<> " and query aggregates on result of table type " <>> tableName
|
||
|
|
||
|
queryResultType =
|
||
|
case _fiJsonAggSelect functionInfo of
|
||
|
JASMultipleRows -> QDBMultipleRows
|
||
|
JASSingleObject -> QDBSingleRow
|
||
|
|
||
|
catMaybes
|
||
|
<$> sequenceA
|
||
|
[ optionalFieldParser (queryResultType) $ selectFunction sourceInfo functionInfo funcDesc,
|
||
|
optionalFieldParser (QDBAggregation) $ selectFunctionAggregate sourceInfo functionInfo funcAggDesc
|
||
|
]
|
||
|
|
||
|
buildFunctionMutationFieldsPG ::
|
||
|
forall r m n pgKind.
|
||
|
MonadBuildSchema ('Postgres pgKind) r m n =>
|
||
|
SourceInfo ('Postgres pgKind) ->
|
||
|
FunctionName ('Postgres pgKind) ->
|
||
|
FunctionInfo ('Postgres pgKind) ->
|
||
|
TableName ('Postgres pgKind) ->
|
||
|
m [FieldParser n (MutationDB ('Postgres pgKind) (RemoteRelationshipField UnpreparedValue) (UnpreparedValue ('Postgres pgKind)))]
|
||
|
buildFunctionMutationFieldsPG sourceInfo functionName functionInfo tableName = do
|
||
|
let funcDesc = Just $ G.Description $ "execute VOLATILE function " <> functionName <<> " which returns " <>> tableName
|
||
|
jsonAggSelect = _fiJsonAggSelect functionInfo
|
||
|
catMaybes
|
||
|
<$> sequenceA
|
||
|
[ optionalFieldParser (MDBFunction jsonAggSelect) $ selectFunction sourceInfo functionInfo funcDesc
|
||
|
-- TODO: do we want aggregate mutation functions?
|
||
|
]
|