mirror of
https://github.com/hasura/graphql-engine.git
synced 2024-12-18 04:51:35 +03:00
133 lines
4.4 KiB
Haskell
133 lines
4.4 KiB
Haskell
{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE MultiWayIf #-}
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{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TupleSections #-}
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module Hasura.GraphQL.Resolve.Select
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( convertSelect
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, convertSelectByPKey
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, fromSelSet
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, fieldAsPath
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) where
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import Data.Has
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import Hasura.Prelude
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import qualified Data.HashMap.Strict as Map
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import qualified Language.GraphQL.Draft.Syntax as G
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import qualified Hasura.RQL.DML.Select as RS
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import qualified Hasura.SQL.DML as S
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import Hasura.GraphQL.Resolve.BoolExp
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import Hasura.GraphQL.Resolve.Context
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import Hasura.GraphQL.Resolve.InputValue
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import Hasura.GraphQL.Validate.Field
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import Hasura.GraphQL.Validate.Types
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import Hasura.RQL.DML.Internal (onlyPositiveInt)
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import Hasura.RQL.Types
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import Hasura.SQL.Types
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import Hasura.SQL.Value
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fromSelSet
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:: G.NamedType
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-> SelSet
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-> Convert [(FieldName, RS.AnnFld)]
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fromSelSet fldTy flds =
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forM (toList flds) $ \fld -> do
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let fldName = _fName fld
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let rqlFldName = FieldName $ G.unName $ G.unAlias $ _fAlias fld
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(rqlFldName,) <$> case fldName of
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"__typename" -> return $ RS.FExp $ G.unName $ G.unNamedType fldTy
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_ -> do
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fldInfo <- getFldInfo fldTy fldName
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case fldInfo of
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Left colInfo -> return $ RS.FCol colInfo
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Right (relInfo, tableFilter, tableLimit, _) -> do
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let relTN = riRTable relInfo
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relSelData <- fromField relTN tableFilter tableLimit fld
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let annRel = RS.AnnRel (riName relInfo) (riType relInfo)
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(riMapping relInfo) relSelData
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return $ RS.FRel annRel
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fieldAsPath :: (MonadError QErr m) => Field -> m a -> m a
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fieldAsPath fld = nameAsPath $ _fName fld
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parseTableArgs
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:: QualifiedTable -> ArgsMap -> Convert RS.TableArgs
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parseTableArgs tn args = do
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whereExpM <- withArgM args "where" $ convertBoolExp tn
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ordByExpM <- withArgM args "order_by" parseOrderBy
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limitExpM <- withArgM args "limit" parseLimit
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offsetExpM <- withArgM args "offset" $ asPGColVal >=> prepare
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return $ RS.TableArgs whereExpM ordByExpM limitExpM offsetExpM
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fromField
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:: QualifiedTable -> S.BoolExp -> Maybe Int -> Field -> Convert RS.AnnSel
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fromField tn permFilter permLimitM fld = fieldAsPath fld $ do
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tableArgs <- parseTableArgs tn args
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annFlds <- fromSelSet (_fType fld) $ _fSelSet fld
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return $ RS.AnnSel annFlds tn Nothing permFilter permLimitM tableArgs
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where
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args = _fArguments fld
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getEnumInfo
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:: ( MonadError QErr m
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, MonadReader r m
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, Has OrdByResolveCtx r
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)
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=> G.NamedType -> G.EnumValue -> m OrdByResolveCtxElem
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getEnumInfo nt v = do
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-- fldMap <- _gcFieldMap <$> ask
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ordByCtx <- asks getter
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onNothing (Map.lookup (nt,v) ordByCtx) $
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throw500 $ "could not lookup " <> showName (G.unEnumValue v) <> " in " <>
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showNamedTy nt
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parseOrderBy
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:: (MonadError QErr m
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, MonadReader r m
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, Has OrdByResolveCtx r
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)
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=> AnnGValue -> m [RS.AnnOrderByItem]
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parseOrderBy v = do
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enums <- withArray (const $ mapM asEnumVal) v
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mapM (uncurry getEnumInfo) enums
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parseLimit :: ( MonadError QErr m ) => AnnGValue -> m Int
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parseLimit v = do
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(_, pgColVal) <- asPGColVal v
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limit <- maybe noIntErr return $ pgColValueToInt pgColVal
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-- validate int value
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onlyPositiveInt limit
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return limit
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where
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noIntErr = throw400 Unexpected "expecting Integer value for \"limit\""
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fromFieldByPKey
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:: QualifiedTable -> S.BoolExp -> Field -> Convert RS.AnnSel
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fromFieldByPKey tn permFilter fld = fieldAsPath fld $ do
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boolExp <- pgColValToBoolExp tn $ _fArguments fld
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annFlds <- fromSelSet (_fType fld) $ _fSelSet fld
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return $ RS.AnnSel annFlds tn Nothing permFilter Nothing $
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RS.noTableArgs { RS._taWhere = Just boolExp}
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convertSelect
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:: QualifiedTable -> S.BoolExp -> Maybe Int -> Field -> Convert RespTx
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convertSelect qt permFilter permLimit fld = do
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selData <- withPathK "selectionSet" $
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fromField qt permFilter permLimit fld
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prepArgs <- get
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return $ RS.selectP2 False (selData, prepArgs)
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convertSelectByPKey
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:: QualifiedTable -> S.BoolExp -> Field -> Convert RespTx
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convertSelectByPKey qt permFilter fld = do
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selData <- withPathK "selectionSet" $
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fromFieldByPKey qt permFilter fld
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prepArgs <- get
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return $ RS.selectP2 True (selData, prepArgs)
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