mirror of
https://github.com/hasura/graphql-engine.git
synced 2024-12-17 12:31:52 +03:00
244 lines
9.8 KiB
Haskell
244 lines
9.8 KiB
Haskell
{- |
|
|
Description: Create/delete SQL functions to/from Hasura metadata.
|
|
-}
|
|
|
|
module Hasura.RQL.DDL.Schema.Function where
|
|
|
|
import Hasura.Prelude
|
|
|
|
import qualified Control.Monad.Validate as MV
|
|
import qualified Data.HashMap.Strict as M
|
|
import qualified Data.HashMap.Strict.InsOrd as OMap
|
|
import qualified Data.Sequence as Seq
|
|
import qualified Data.Text as T
|
|
import qualified Database.PG.Query as Q
|
|
|
|
import Control.Lens hiding ((.=))
|
|
import Data.Aeson
|
|
import Data.Text.Extended
|
|
|
|
import qualified Language.GraphQL.Draft.Syntax as G
|
|
|
|
import Hasura.Backends.Postgres.SQL.Types
|
|
import Hasura.EncJSON
|
|
import Hasura.RQL.Types
|
|
import Hasura.Server.Utils (englishList, makeReasonMessage)
|
|
|
|
|
|
mkFunctionArgs :: Int -> [QualifiedPGType] -> [FunctionArgName] -> [FunctionArg]
|
|
mkFunctionArgs defArgsNo tys argNames =
|
|
bool withNames withNoNames $ null argNames
|
|
where
|
|
hasDefaultBoolSeq = replicate (length tys - defArgsNo) (HasDefault False)
|
|
-- only last arguments can have default expression
|
|
<> replicate defArgsNo (HasDefault True)
|
|
|
|
tysWithHasDefault = zip tys hasDefaultBoolSeq
|
|
|
|
withNoNames = flip map tysWithHasDefault $ uncurry $ FunctionArg Nothing
|
|
withNames = zipWith mkArg argNames tysWithHasDefault
|
|
|
|
mkArg "" (ty, hasDef) = FunctionArg Nothing ty hasDef
|
|
mkArg n (ty, hasDef) = FunctionArg (Just n) ty hasDef
|
|
|
|
validateFuncArgs :: MonadError QErr m => [FunctionArg] -> m ()
|
|
validateFuncArgs args =
|
|
for_ (nonEmpty invalidArgs) \someInvalidArgs ->
|
|
throw400 NotSupported $
|
|
"arguments: " <> englishList "and" someInvalidArgs
|
|
<> " are not in compliance with GraphQL spec"
|
|
where
|
|
funcArgsText = mapMaybe (fmap getFuncArgNameTxt . faName) args
|
|
invalidArgs = filter (isNothing . G.mkName) funcArgsText
|
|
|
|
data FunctionIntegrityError
|
|
= FunctionNameNotGQLCompliant
|
|
| FunctionVariadic
|
|
| FunctionReturnNotCompositeType
|
|
| FunctionReturnNotSetof
|
|
| FunctionReturnNotSetofTable
|
|
| NonVolatileFunctionAsMutation
|
|
| FunctionSessionArgumentNotJSON !FunctionArgName
|
|
| FunctionInvalidSessionArgument !FunctionArgName
|
|
| FunctionInvalidArgumentNames [FunctionArgName]
|
|
deriving (Show, Eq)
|
|
|
|
mkFunctionInfo
|
|
:: (QErrM m)
|
|
=> QualifiedFunction
|
|
-> SystemDefined
|
|
-> FunctionConfig
|
|
-> RawFunctionInfo
|
|
-> m (FunctionInfo, SchemaDependency)
|
|
mkFunctionInfo qf systemDefined FunctionConfig{..} rawFuncInfo =
|
|
either (throw400 NotSupported . showErrors) pure
|
|
=<< MV.runValidateT validateFunction
|
|
where
|
|
functionArgs = mkFunctionArgs defArgsNo inpArgTyps inpArgNames
|
|
RawFunctionInfo _ hasVariadic funVol retSn retN retTyTyp retSet
|
|
inpArgTyps inpArgNames defArgsNo returnsTab descM
|
|
= rawFuncInfo
|
|
returnType = QualifiedPGType retSn retN retTyTyp
|
|
|
|
throwValidateError = MV.dispute . pure
|
|
|
|
validateFunction = do
|
|
unless (has _Right $ qualifiedObjectToName qf) $
|
|
throwValidateError FunctionNameNotGQLCompliant
|
|
when hasVariadic $ throwValidateError FunctionVariadic
|
|
when (retTyTyp /= PGKindComposite) $ throwValidateError FunctionReturnNotCompositeType
|
|
unless retSet $ throwValidateError FunctionReturnNotSetof
|
|
unless returnsTab $ throwValidateError FunctionReturnNotSetofTable
|
|
-- We mostly take the user at their word here and will, e.g. expose a
|
|
-- function as a query if it is marked VOLATILE (since perhaps the user
|
|
-- is using the function to do some logging, say). But this is also a
|
|
-- footgun we'll need to try to document (since `VOLATILE` is default
|
|
-- when volatility is omitted). See the original approach here:
|
|
-- https://github.com/hasura/graphql-engine/pull/5858
|
|
--
|
|
-- This is the one exception where we do some validation. We're not
|
|
-- commited to this check, and it would be backwards compatible to remove
|
|
-- it, but this seemed like an obvious case:
|
|
when (funVol /= FTVOLATILE && _fcExposedAs == Just FEAMutation) $
|
|
throwValidateError $ NonVolatileFunctionAsMutation
|
|
-- If 'exposed_as' is omitted we'll infer it from the volatility:
|
|
let exposeAs = flip fromMaybe _fcExposedAs $ case funVol of
|
|
FTVOLATILE -> FEAMutation
|
|
_ -> FEAQuery
|
|
|
|
-- validate function argument names
|
|
validateFunctionArgNames
|
|
|
|
inputArguments <- makeInputArguments
|
|
|
|
let retTable = typeToTable returnType
|
|
|
|
pure ( FunctionInfo qf systemDefined funVol exposeAs inputArguments retTable descM
|
|
, SchemaDependency (SOTable retTable) DRTable
|
|
)
|
|
|
|
validateFunctionArgNames = do
|
|
let argNames = mapMaybe faName functionArgs
|
|
invalidArgs = filter (isNothing . G.mkName . getFuncArgNameTxt) argNames
|
|
unless (null invalidArgs) $
|
|
throwValidateError $ FunctionInvalidArgumentNames invalidArgs
|
|
|
|
makeInputArguments =
|
|
case _fcSessionArgument of
|
|
Nothing -> pure $ Seq.fromList $ map IAUserProvided functionArgs
|
|
Just sessionArgName -> do
|
|
unless (any (\arg -> Just sessionArgName == faName arg) functionArgs) $
|
|
throwValidateError $ FunctionInvalidSessionArgument sessionArgName
|
|
fmap Seq.fromList $ forM functionArgs $ \arg ->
|
|
if Just sessionArgName == faName arg then do
|
|
let argTy = _qptName $ faType arg
|
|
if argTy == PGJSON then pure $ IASessionVariables sessionArgName
|
|
else MV.refute $ pure $ FunctionSessionArgumentNotJSON sessionArgName
|
|
else pure $ IAUserProvided arg
|
|
|
|
showErrors allErrors =
|
|
"the function " <> qf <<> " cannot be tracked "
|
|
<> makeReasonMessage allErrors showOneError
|
|
|
|
showOneError = \case
|
|
FunctionNameNotGQLCompliant -> "function name is not a legal GraphQL identifier"
|
|
FunctionVariadic -> "function with \"VARIADIC\" parameters are not supported"
|
|
FunctionReturnNotCompositeType -> "the function does not return a \"COMPOSITE\" type"
|
|
FunctionReturnNotSetof -> "the function does not return a SETOF"
|
|
FunctionReturnNotSetofTable -> "the function does not return a SETOF table"
|
|
NonVolatileFunctionAsMutation ->
|
|
"the function was requested to be exposed as a mutation, but is not marked VOLATILE. " <>
|
|
"Maybe the function was given the wrong volatility when it was defined?"
|
|
FunctionSessionArgumentNotJSON argName ->
|
|
"given session argument " <> argName <<> " is not of type json"
|
|
FunctionInvalidSessionArgument argName ->
|
|
"given session argument " <> argName <<> " not the input argument of the function"
|
|
FunctionInvalidArgumentNames args ->
|
|
let argsText = T.intercalate "," $ map getFuncArgNameTxt args
|
|
in "the function arguments " <> argsText <> " are not in compliance with GraphQL spec"
|
|
|
|
newtype TrackFunction
|
|
= TrackFunction
|
|
{ tfName :: QualifiedFunction}
|
|
deriving (Show, Eq, FromJSON, ToJSON)
|
|
|
|
-- | Track function, Phase 1:
|
|
-- Validate function tracking operation. Fails if function is already being
|
|
-- tracked, or if a table with the same name is being tracked.
|
|
trackFunctionP1
|
|
:: (CacheRM m, QErrM m) => QualifiedFunction -> m ()
|
|
trackFunctionP1 qf = do
|
|
rawSchemaCache <- askSchemaCache
|
|
when (M.member qf $ scFunctions rawSchemaCache) $
|
|
throw400 AlreadyTracked $ "function already tracked : " <>> qf
|
|
let qt = fmap (TableName . getFunctionTxt) qf
|
|
when (M.member qt $ scTables rawSchemaCache) $
|
|
throw400 NotSupported $ "table with name " <> qf <<> " already exists"
|
|
|
|
trackFunctionP2
|
|
:: (MonadError QErr m, CacheRWM m, MetadataM m)
|
|
=> QualifiedFunction -> FunctionConfig -> m EncJSON
|
|
trackFunctionP2 qf config = do
|
|
buildSchemaCacheFor (MOFunction qf)
|
|
$ MetadataModifier
|
|
$ metaFunctions %~ OMap.insert qf (FunctionMetadata qf config)
|
|
pure successMsg
|
|
|
|
handleMultipleFunctions :: (QErrM m) => QualifiedFunction -> [a] -> m a
|
|
handleMultipleFunctions qf = \case
|
|
[] ->
|
|
throw400 NotExists $ "no such function exists in postgres : " <>> qf
|
|
[fi] -> return fi
|
|
_ ->
|
|
throw400 NotSupported $
|
|
"function " <> qf <<> " is overloaded. Overloaded functions are not supported"
|
|
|
|
fetchRawFunctionInfo :: MonadTx m => QualifiedFunction -> m RawFunctionInfo
|
|
fetchRawFunctionInfo qf@(QualifiedObject sn fn) =
|
|
handleMultipleFunctions qf =<< map (Q.getAltJ . runIdentity) <$> fetchFromDatabase
|
|
where
|
|
fetchFromDatabase = liftTx $
|
|
Q.listQE defaultTxErrorHandler [Q.sql|
|
|
SELECT function_info
|
|
FROM hdb_catalog.hdb_function_info_agg
|
|
WHERE function_schema = $1
|
|
AND function_name = $2
|
|
|] (sn, fn) True
|
|
|
|
runTrackFunc
|
|
:: (MonadTx m, CacheRWM m, MetadataM m)
|
|
=> TrackFunction -> m EncJSON
|
|
runTrackFunc (TrackFunction qf)= do
|
|
trackFunctionP1 qf
|
|
trackFunctionP2 qf emptyFunctionConfig
|
|
|
|
runTrackFunctionV2
|
|
:: (QErrM m, CacheRWM m, MetadataM m)
|
|
=> TrackFunctionV2 -> m EncJSON
|
|
runTrackFunctionV2 (TrackFunctionV2 qf config) = do
|
|
trackFunctionP1 qf
|
|
trackFunctionP2 qf config
|
|
|
|
-- | JSON API payload for 'untrack_function':
|
|
--
|
|
-- https://hasura.io/docs/1.0/graphql/core/api-reference/schema-metadata-api/custom-functions.html#untrack-function
|
|
newtype UnTrackFunction
|
|
= UnTrackFunction
|
|
{ utfName :: QualifiedFunction }
|
|
deriving (Show, Eq, FromJSON, ToJSON)
|
|
|
|
runUntrackFunc
|
|
:: (CacheRWM m, MonadError QErr m, MetadataM m)
|
|
=> UnTrackFunction -> m EncJSON
|
|
runUntrackFunc (UnTrackFunction qf) = do
|
|
void $ askFunctionInfo qf
|
|
-- Delete function from metadata
|
|
withNewInconsistentObjsCheck
|
|
$ buildSchemaCache
|
|
$ dropFunctionInMetadata qf
|
|
pure successMsg
|
|
|
|
dropFunctionInMetadata :: QualifiedFunction -> MetadataModifier
|
|
dropFunctionInMetadata function = MetadataModifier $
|
|
metaFunctions %~ OMap.delete function
|