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Remote relationships are now supported on SQL Server and BigQuery. The major change though is the re-architecture of remote join execution logic. Prior to this PR, each backend is responsible for processing the remote relationships that are part of their AST. This is not ideal as there is nothing specific about a remote join's execution that ties it to a backend. The only backend specific part is whether or not the specification of the remote relationship is valid (i.e, we'll need to validate whether the scalars are compatible). The approach now changes to this: 1. Before delegating the AST to the backend, we traverse the AST, collect all the remote joins while modifying the AST to add necessary join fields where needed. 1. Once the remote joins are collected from the AST, the database call is made to fetch the response. The necessary data for the remote join(s) is collected from the database's response and one or more remote schema calls are constructed as necessary. 1. The remote schema calls are then executed and the data from the database and from the remote schemas is joined to produce the final response. ### Known issues 1. Ideally the traversal of the IR to collect remote joins should return an AST which does not include remote join fields. This operation can be type safe but isn't taken up as part of the PR. 1. There is a lot of code duplication between `Transport/HTTP.hs` and `Transport/Websocket.hs` which needs to be fixed ASAP. This too hasn't been taken up by this PR. 1. The type which represents the execution plan is only modified to handle our current remote joins and as such it will have to be changed to accommodate general remote joins. 1. Use of lenses would have reduced the boilerplate code to collect remote joins from the base AST. 1. The current remote join logic assumes that the join columns of a remote relationship appear with their names in the database response. This however is incorrect as they could be aliased. This can be taken up by anyone, I've left a comment in the code. ### Notes to the reviewers I think it is best reviewed commit by commit. 1. The first one is very straight forward. 1. The second one refactors the remote join execution logic but other than moving things around, it doesn't change the user facing functionality. This moves Postgres specific parts to `Backends/Postgres` module from `Execute`. Some IR related code to `Hasura.RQL.IR` module. Simplifies various type class function signatures as a backend doesn't have to handle remote joins anymore 1. The third one fixes partial case matches that for some weird reason weren't shown as warnings before this refactor 1. The fourth one generalizes the validation logic of remote relationships and implements `scalarTypeGraphQLName` function on SQL Server and BigQuery which is used by the validation logic. This enables remote relationships on BigQuery and SQL Server. https://github.com/hasura/graphql-engine-mono/pull/1497 GitOrigin-RevId: 77dd8eed326602b16e9a8496f52f46d22b795598
109 lines
3.6 KiB
Haskell
109 lines
3.6 KiB
Haskell
module Hasura.RQL.DML.Delete
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( validateDeleteQWith
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, validateDeleteQ
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, AnnDelG(..)
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, traverseAnnDel
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, AnnDel
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, execDeleteQuery
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, runDelete
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) where
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import Hasura.Prelude
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import qualified Data.Sequence as DS
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import qualified Database.PG.Query as Q
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import Control.Monad.Trans.Control (MonadBaseControl)
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import Data.Aeson
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import qualified Hasura.Backends.Postgres.SQL.DML as S
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import qualified Hasura.Tracing as Tracing
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import Hasura.Backends.Postgres.Connection
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import Hasura.Backends.Postgres.Execute.Mutation
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import Hasura.Backends.Postgres.Translate.Returning
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import Hasura.Backends.Postgres.Types.Table
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import Hasura.Base.Error
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import Hasura.EncJSON
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import Hasura.RQL.DML.Internal
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import Hasura.RQL.DML.Types
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import Hasura.RQL.IR.Delete
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import Hasura.RQL.Types
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import Hasura.RQL.Types.Run
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import Hasura.Session
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validateDeleteQWith
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:: (UserInfoM m, QErrM m, TableInfoRM ('Postgres 'Vanilla) m)
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=> SessVarBldr ('Postgres 'Vanilla) m
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-> (ColumnType ('Postgres 'Vanilla) -> Value -> m S.SQLExp)
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-> DeleteQuery
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-> m (AnnDel ('Postgres 'Vanilla))
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validateDeleteQWith sessVarBldr prepValBldr
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(DeleteQuery tableName _ rqlBE mRetCols) = do
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tableInfo <- askTabInfoSource tableName
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let coreInfo = _tiCoreInfo tableInfo
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-- If table is view then check if it deletable
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mutableView tableName viIsDeletable
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(_tciViewInfo coreInfo) "deletable"
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-- Check if the role has delete permissions
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delPerm <- askDelPermInfo tableInfo
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-- Check if all dependent headers are present
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validateHeaders $ dpiRequiredHeaders delPerm
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-- Check if select is allowed
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selPerm <- modifyErr (<> selNecessaryMsg) $
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askSelPermInfo tableInfo
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let fieldInfoMap = _tciFieldInfoMap coreInfo
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allCols = getCols fieldInfoMap
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-- convert the returning cols into sql returing exp
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mAnnRetCols <- forM mRetCols $ \retCols ->
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withPathK "returning" $ checkRetCols fieldInfoMap selPerm retCols
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-- convert the where clause
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annSQLBoolExp <- withPathK "where" $
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convBoolExp fieldInfoMap selPerm rqlBE sessVarBldr tableName (valueParserWithCollectableType prepValBldr)
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resolvedDelFltr <- convAnnBoolExpPartialSQL sessVarBldr $
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dpiFilter delPerm
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return $ AnnDel tableName
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(resolvedDelFltr, annSQLBoolExp)
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(mkDefaultMutFlds mAnnRetCols) allCols
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where
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selNecessaryMsg =
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"; \"delete\" is only allowed if the role "
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<> "has \"select\" permission as \"where\" can't be used "
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<> "without \"select\" permission on the table"
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validateDeleteQ
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:: (QErrM m, UserInfoM m, CacheRM m)
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=> DeleteQuery -> m (AnnDel ('Postgres 'Vanilla), DS.Seq Q.PrepArg)
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validateDeleteQ query = do
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let source = doSource query
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tableCache :: TableCache ('Postgres 'Vanilla) <- askTableCache source
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flip runTableCacheRT (source, tableCache) $ runDMLP1T $
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validateDeleteQWith sessVarFromCurrentSetting binRHSBuilder query
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runDelete
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:: ( QErrM m, UserInfoM m, CacheRM m
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, HasServerConfigCtx m, MonadIO m
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, Tracing.MonadTrace m, MonadBaseControl IO m
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, MetadataM m
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)
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=> DeleteQuery
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-> m EncJSON
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runDelete q = do
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sourceConfig <- askSourceConfig @('Postgres 'Vanilla) (doSource q)
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strfyNum <- stringifyNum . _sccSQLGenCtx <$> askServerConfigCtx
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userInfo <- askUserInfo
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validateDeleteQ q
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>>= runQueryLazyTx (_pscExecCtx sourceConfig) Q.ReadWrite
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. execDeleteQuery strfyNum userInfo
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