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## Description This PR is a subset of #3069, that does roughly that #3031 was aiming to do: add the schema cache building phase for relationships from remote servers. This PR does not change any of the code that *uses* remote relationships, meaning we ignore the added schema cache information. It also contains dependency-tracking code, which was originally missing from #3031; in turn, this pulls some of the metadata API as well, since we identify remote relationships by how they were created. PR-URL: https://github.com/hasura/graphql-engine-mono/pull/3540 GitOrigin-RevId: ed962b6d07fd4adbf0a71e0d79736a4e8b422fea
246 lines
12 KiB
Haskell
246 lines
12 KiB
Haskell
module Hasura.RQL.DDL.Schema.Cache.Dependencies
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( resolveDependencies,
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)
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where
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import Control.Arrow.Extended
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import Control.Lens hiding ((.=))
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import Data.Aeson
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import Data.HashMap.Strict.Extended qualified as M
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import Data.HashMap.Strict.InsOrd qualified as OMap
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import Data.HashSet qualified as HS
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import Data.List (nub)
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import Data.Monoid (First)
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import Data.Text.Extended
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import Hasura.Base.Error
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import Hasura.Prelude
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import Hasura.RQL.DDL.Network
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import Hasura.RQL.DDL.Schema.Cache.Common
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import Hasura.RQL.Types
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import Hasura.SQL.AnyBackend qualified as AB
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import Language.GraphQL.Draft.Syntax qualified as G
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-- | Processes collected 'CIDependency' values into a 'DepMap', performing integrity checking to
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-- ensure the dependencies actually exist. If a dependency is missing, its transitive dependents are
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-- removed from the cache, and 'InconsistentMetadata's are returned.
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resolveDependencies ::
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(ArrowKleisli m arr, QErrM m) =>
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( BuildOutputs,
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[(MetadataObject, SchemaObjId, SchemaDependency)]
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)
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`arr` (BuildOutputs, [InconsistentMetadata], DepMap)
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resolveDependencies = arrM \(cache, dependencies) -> do
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let dependencyMap =
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dependencies
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& M.groupOn (view _2)
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& fmap (map \(metadataObject, _, schemaDependency) -> (metadataObject, schemaDependency))
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performIteration 0 cache [] dependencyMap
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-- Processes dependencies using an iterative process that alternates between two steps:
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--
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-- 1. First, pruneDanglingDependents searches for any dependencies that do not exist in the
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-- current cache and removes their dependents from the dependency map, returning an
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-- InconsistentMetadata for each dependent that was removed. This step does not change
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-- the schema cache in any way.
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--
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-- 2. Second, deleteMetadataObject drops the pruned dependent objects from the cache. It does
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-- not alter (or consult) the dependency map, so transitive dependents are /not/ removed.
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--
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-- By iterating the above process until pruneDanglingDependents does not discover any new
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-- inconsistencies, all missing dependencies will eventually be removed, and since dependency
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-- graphs between schema objects are unlikely to be very deep, it will usually terminate in just
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-- a few iterations.
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performIteration ::
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(QErrM m) =>
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Int ->
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BuildOutputs ->
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[InconsistentMetadata] ->
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HashMap SchemaObjId [(MetadataObject, SchemaDependency)] ->
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m (BuildOutputs, [InconsistentMetadata], DepMap)
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performIteration iterationNumber cache inconsistencies dependencies = do
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let (newInconsistencies, prunedDependencies) = pruneDanglingDependents cache dependencies
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case newInconsistencies of
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[] -> pure (cache, inconsistencies, HS.fromList . map snd <$> prunedDependencies)
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_
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| iterationNumber < 100 -> do
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let inconsistentIds = nub $ concatMap imObjectIds newInconsistencies
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prunedCache = foldl' (flip deleteMetadataObject) cache inconsistentIds
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allInconsistencies = inconsistencies <> newInconsistencies
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performIteration (iterationNumber + 1) prunedCache allInconsistencies prunedDependencies
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| otherwise ->
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-- Running for 100 iterations without terminating is (hopefully) enormously unlikely
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-- unless we did something very wrong, so halt the process and abort with some
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-- debugging information.
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throwError
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(err500 Unexpected "schema dependency resolution failed to terminate")
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{ qeInternal =
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Just $
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ExtraInternal $
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object
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[ "inconsistent_objects"
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.= object
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[ "old" .= inconsistencies,
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"new" .= newInconsistencies
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],
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"pruned_dependencies" .= (map snd <$> prunedDependencies)
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]
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}
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pruneDanglingDependents ::
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BuildOutputs ->
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HashMap SchemaObjId [(MetadataObject, SchemaDependency)] ->
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([InconsistentMetadata], HashMap SchemaObjId [(MetadataObject, SchemaDependency)])
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pruneDanglingDependents cache =
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fmap (M.filter (not . null)) . traverse do
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partitionEithers . map \(metadataObject, dependency) -> case resolveDependency dependency of
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Right () -> Right (metadataObject, dependency)
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Left errorMessage -> Left (InconsistentObject errorMessage Nothing metadataObject)
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where
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resolveDependency :: SchemaDependency -> Either Text ()
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resolveDependency (SchemaDependency objectId _) = case objectId of
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SOSource source ->
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void $
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M.lookup source (_boSources cache)
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`onNothing` Left ("no such source exists: " <>> source)
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SORemoteSchema remoteSchemaName ->
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unless (remoteSchemaName `M.member` _boRemoteSchemas cache) $
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Left $ "remote schema " <> remoteSchemaName <<> " is not found"
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SORemoteSchemaPermission remoteSchemaName roleName -> do
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remoteSchema <-
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onNothing (M.lookup remoteSchemaName $ _boRemoteSchemas cache) $
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Left $ "remote schema " <> remoteSchemaName <<> " is not found"
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unless (roleName `M.member` _rscPermissions (fst remoteSchema)) $
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Left $
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"no permission defined on remote schema " <> remoteSchemaName
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<<> " for role " <>> roleName
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SORemoteSchemaRemoteRelationship remoteSchemaName typeName relationshipName -> do
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remoteSchema <-
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fmap fst $
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onNothing (M.lookup remoteSchemaName $ _boRemoteSchemas cache) $
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Left $ "remote schema " <> remoteSchemaName <<> " is not found"
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void $
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onNothing
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(OMap.lookup typeName (_rscRemoteRelationships remoteSchema) >>= OMap.lookup relationshipName)
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$ Left $
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"remote relationship " <> relationshipName
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<<> " on type " <> G.unName typeName <> " on " <> remoteSchemaName
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<<> " is not found"
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SOSourceObj source exists -> do
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AB.dispatchAnyBackend @Backend exists $ \sourceObjId -> do
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sourceInfo <- castSourceInfo source sourceObjId
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case sourceObjId of
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SOITable tableName -> do
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void $ resolveTable sourceInfo tableName
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SOIFunction functionName ->
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void $
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M.lookup functionName (_siFunctions sourceInfo)
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`onNothing` Left ("function " <> functionName <<> " is not tracked")
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SOITableObj tableName tableObjectId -> do
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tableInfo <- resolveTable sourceInfo tableName
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case tableObjectId of
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TOCol columnName ->
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void $ resolveField tableInfo (columnToFieldName tableInfo columnName) _FIColumn "column"
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TORel relName ->
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void $ resolveField tableInfo (fromRel relName) _FIRelationship "relationship"
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TOComputedField fieldName ->
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void $ resolveField tableInfo (fromComputedField fieldName) _FIComputedField "computed field"
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TORemoteRel fieldName ->
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void $ resolveField tableInfo (fromRemoteRelationship fieldName) _FIRemoteRelationship "remote relationship"
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TOForeignKey constraintName -> do
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let foreignKeys = _tciForeignKeys $ _tiCoreInfo tableInfo
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unless (isJust $ find ((== constraintName) . _cName . _fkConstraint) foreignKeys) $
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Left $
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"no foreign key constraint named " <> constraintName <<> " is "
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<> "defined for table " <>> tableName
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TOPerm roleName permType -> withPermType permType \accessor -> do
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let permLens = permAccToLens accessor
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unless (has (tiRolePermInfoMap . ix roleName . permLens . _Just) tableInfo) $
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Left $
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"no " <> permTypeToCode permType <> " permission defined on table "
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<> tableName <<> " for role " <>> roleName
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TOTrigger triggerName ->
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unless (M.member triggerName (_tiEventTriggerInfoMap tableInfo)) $
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Left $
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"no event trigger named " <> triggerName <<> " is defined for table " <>> tableName
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SORole roleName ->
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void $
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(M.lookup roleName (_boRoles cache))
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`onNothing` Left ("parent role " <> roleName <<> " does not exist")
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castSourceInfo ::
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(Backend b) => SourceName -> SourceObjId b -> Either Text (SourceInfo b)
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castSourceInfo sourceName _ =
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-- TODO: if the cast returns Nothing, we should be throwing an internal error
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-- the type of the dependency in sources is not as recorded
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(M.lookup sourceName (_boSources cache) >>= unsafeSourceInfo)
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`onNothing` Left ("no such source found " <>> sourceName)
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resolveTable sourceInfo tableName =
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M.lookup tableName (_siTables sourceInfo)
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`onNothing` Left ("table " <> tableName <<> " is not tracked")
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columnToFieldName :: forall b. (Backend b) => TableInfo b -> Column b -> FieldName
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columnToFieldName _ = fromCol @b
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resolveField ::
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Backend b =>
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TableInfo b ->
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FieldName ->
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Getting (First a) (FieldInfo b) a ->
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Text ->
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Either Text a
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resolveField tableInfo fieldName fieldType fieldTypeName = do
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let coreInfo = _tiCoreInfo tableInfo
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tableName = tableInfoName tableInfo
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fieldInfo <-
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M.lookup fieldName (_tciFieldInfoMap coreInfo)
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`onNothing` Left
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("table " <> tableName <<> " has no field named " <>> fieldName)
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(fieldInfo ^? fieldType)
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`onNothing` Left
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("field " <> fieldName <<> "of table " <> tableName <<> " is not a " <> fieldTypeName)
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deleteMetadataObject ::
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MetadataObjId -> BuildOutputs -> BuildOutputs
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deleteMetadataObject = \case
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MOSource name -> boSources %~ M.delete name
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MOSourceObjId source exists -> AB.dispatchAnyBackend @Backend exists (\sourceObjId -> boSources %~ M.adjust (deleteObjId sourceObjId) source)
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MORemoteSchema name -> boRemoteSchemas %~ M.delete name
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MORemoteSchemaPermissions name role -> boRemoteSchemas . ix name . _1 . rscPermissions %~ M.delete role
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MORemoteSchemaRemoteRelationship remoteSchema typeName relationshipName ->
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boRemoteSchemas . ix remoteSchema . _1 . rscRemoteRelationships . ix typeName %~ OMap.delete relationshipName
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MOCronTrigger name -> boCronTriggers %~ M.delete name
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MOCustomTypes -> boCustomTypes %~ const emptyAnnotatedCustomTypes
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MOAction name -> boActions %~ M.delete name
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MOEndpoint name -> boEndpoints %~ M.delete name
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MOActionPermission name role -> boActions . ix name . aiPermissions %~ M.delete role
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MOInheritedRole name -> boRoles %~ M.delete name
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MOHostTlsAllowlist host -> removeHostFromAllowList host
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where
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removeHostFromAllowList hst bo =
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bo
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{ _boTlsAllowlist = filter (not . checkForHostnameInAllowlistObject hst) (_boTlsAllowlist bo)
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}
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deleteObjId :: forall b. (Backend b) => SourceMetadataObjId b -> BackendSourceInfo -> BackendSourceInfo
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deleteObjId sourceObjId sourceInfo =
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maybe
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sourceInfo
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(AB.mkAnyBackend . deleteObjFn sourceObjId)
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$ unsafeSourceInfo sourceInfo
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deleteObjFn :: (Backend b) => SourceMetadataObjId b -> SourceInfo b -> SourceInfo b
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deleteObjFn = \case
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SMOTable name -> siTables %~ M.delete name
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SMOFunction name -> siFunctions %~ M.delete name
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SMOFunctionPermission functionName role ->
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siFunctions . ix functionName . fiPermissions %~ M.delete role
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SMOTableObj tableName tableObjectId ->
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siTables . ix tableName %~ case tableObjectId of
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MTORel name _ -> tiCoreInfo . tciFieldInfoMap %~ M.delete (fromRel name)
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MTOComputedField name -> tiCoreInfo . tciFieldInfoMap %~ M.delete (fromComputedField name)
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MTORemoteRelationship name -> tiCoreInfo . tciFieldInfoMap %~ M.delete (fromRemoteRelationship name)
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MTOTrigger name -> tiEventTriggerInfoMap %~ M.delete name
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MTOPerm roleName permType -> withPermType permType \accessor ->
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tiRolePermInfoMap . ix roleName . permAccToLens accessor .~ Nothing
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