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PR-URL: https://github.com/hasura/graphql-engine-mono/pull/5362 GitOrigin-RevId: 5e246c3af3bdf2a7b5b2a66e2e09f40abcdfd9c9
247 lines
7.6 KiB
Haskell
247 lines
7.6 KiB
Haskell
{-# LANGUAGE QuasiQuotes #-}
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{-# OPTIONS_GHC -fno-warn-orphans #-}
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-- | Postgres Connection MonadTx
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--
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-- This module contains 'MonadTx' and related combinators.
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--
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-- 'MonadTx', a class which abstracts the 'QErr' in 'Q.TxE' via 'MonadError'.
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--
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-- The combinators are used for running, tracing, or otherwise perform database
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-- related tasks. Please consult the individual documentation for more
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-- information.
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module Hasura.Backends.Postgres.Connection.MonadTx
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( MonadTx (..),
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runTx,
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runTxWithCtx,
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runQueryTx,
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withUserInfo,
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withTraceContext,
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setHeadersTx,
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setTraceContextInTx,
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sessionInfoJsonExp,
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checkDbConnection,
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doesSchemaExist,
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doesTableExist,
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enablePgcryptoExtension,
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dropHdbCatalogSchema,
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ExtensionsSchema (..),
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)
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where
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import Control.Monad.Morph (hoist)
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import Control.Monad.Trans.Control (MonadBaseControl (..))
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import Control.Monad.Validate
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import Data.Aeson
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import Data.Aeson.Extended
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import Data.Time.Clock.Compat ()
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import Database.PG.Query qualified as Q
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import Database.PG.Query.Connection qualified as Q
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import Hasura.Backends.Postgres.Execute.Types as ET
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import Hasura.Backends.Postgres.SQL.DML qualified as S
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import Hasura.Backends.Postgres.SQL.Types
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import Hasura.Base.Error
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import Hasura.Base.Instances ()
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import Hasura.Prelude
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import Hasura.SQL.Types
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import Hasura.Session
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import Hasura.Tracing qualified as Tracing
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import Test.QuickCheck.Instances.Semigroup ()
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import Test.QuickCheck.Instances.Time ()
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class (MonadError QErr m) => MonadTx m where
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liftTx :: Q.TxE QErr a -> m a
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instance (MonadTx m) => MonadTx (StateT s m) where
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liftTx = lift . liftTx
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instance (MonadTx m) => MonadTx (ReaderT s m) where
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liftTx = lift . liftTx
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instance (Monoid w, MonadTx m) => MonadTx (WriterT w m) where
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liftTx = lift . liftTx
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instance (MonadTx m) => MonadTx (ValidateT e m) where
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liftTx = lift . liftTx
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instance (MonadTx m) => MonadTx (Tracing.TraceT m) where
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liftTx = lift . liftTx
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instance (MonadIO m) => MonadTx (Q.TxET QErr m) where
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liftTx = hoist liftIO
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-- | Executes the given query in a transaction of the specified
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-- mode, within the provided PGExecCtx.
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runTx ::
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( MonadIO m,
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MonadBaseControl IO m
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) =>
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PGExecCtx ->
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Q.TxAccess ->
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Q.TxET QErr m a ->
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ExceptT QErr m a
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runTx pgExecCtx = \case
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Q.ReadOnly -> _pecRunReadOnly pgExecCtx
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Q.ReadWrite -> _pecRunReadWrite pgExecCtx
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runTxWithCtx ::
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( MonadIO m,
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MonadBaseControl IO m,
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MonadError QErr m,
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Tracing.MonadTrace m,
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UserInfoM m
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) =>
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PGExecCtx ->
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Q.TxAccess ->
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Q.TxET QErr m a ->
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m a
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runTxWithCtx pgExecCtx txAccess tx = do
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traceCtx <- Tracing.currentContext
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userInfo <- askUserInfo
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liftEitherM $
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runExceptT $
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runTx pgExecCtx txAccess $
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withTraceContext traceCtx $
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withUserInfo userInfo tx
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-- | This runs the given set of statements (Tx) without wrapping them in BEGIN
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-- and COMMIT. This should only be used for running a single statement query!
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runQueryTx ::
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( MonadIO m,
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MonadError QErr m
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) =>
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PGExecCtx ->
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Q.TxET QErr IO a ->
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m a
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runQueryTx pgExecCtx tx =
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liftEither =<< liftIO (runExceptT $ _pecRunReadNoTx pgExecCtx tx)
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setHeadersTx :: (MonadIO m) => SessionVariables -> Q.TxET QErr m ()
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setHeadersTx session = do
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Q.unitQE defaultTxErrorHandler setSess () False
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where
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setSess =
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Q.fromText $
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"SET LOCAL \"hasura.user\" = " <> toSQLTxt (sessionInfoJsonExp session)
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sessionInfoJsonExp :: SessionVariables -> S.SQLExp
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sessionInfoJsonExp = S.SELit . encodeToStrictText
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withUserInfo :: (MonadIO m) => UserInfo -> Q.TxET QErr m a -> Q.TxET QErr m a
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withUserInfo uInfo tx = setHeadersTx (_uiSession uInfo) >> tx
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setTraceContextInTx :: (MonadIO m) => Tracing.TraceContext -> Q.TxET QErr m ()
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setTraceContextInTx traceCtx = Q.unitQE defaultTxErrorHandler sql () False
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where
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sql =
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Q.fromText $
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"SET LOCAL \"hasura.tracecontext\" = "
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<> toSQLTxt (S.SELit . encodeToStrictText . Tracing.injectEventContext $ traceCtx)
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-- | Inject the trace context as a transaction-local variable,
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-- so that it can be picked up by any triggers (including event triggers).
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withTraceContext ::
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(MonadIO m) =>
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Tracing.TraceContext ->
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Q.TxET QErr m a ->
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Q.TxET QErr m a
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withTraceContext ctx tx = setTraceContextInTx ctx >> tx
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deriving instance Tracing.MonadTrace m => Tracing.MonadTrace (Q.TxET e m)
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checkDbConnection :: MonadTx m => m ()
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checkDbConnection = do
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Q.Discard () <- liftTx $ Q.withQE defaultTxErrorHandler [Q.sql| SELECT 1; |] () False
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pure ()
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doesSchemaExist :: MonadTx m => SchemaName -> m Bool
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doesSchemaExist schemaName =
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liftTx $
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(runIdentity . Q.getRow)
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<$> Q.withQE
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defaultTxErrorHandler
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[Q.sql|
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SELECT EXISTS
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( SELECT 1 FROM information_schema.schemata
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WHERE schema_name = $1
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) |]
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(Identity schemaName)
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False
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doesTableExist :: MonadTx m => SchemaName -> TableName -> m Bool
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doesTableExist schemaName tableName =
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liftTx $
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(runIdentity . Q.getRow)
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<$> Q.withQE
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defaultTxErrorHandler
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[Q.sql|
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SELECT EXISTS
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( SELECT 1 FROM pg_tables
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WHERE schemaname = $1 AND tablename = $2
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) |]
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(schemaName, tableName)
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False
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isExtensionAvailable :: MonadTx m => Text -> m Bool
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isExtensionAvailable extensionName =
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liftTx $
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(runIdentity . Q.getRow)
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<$> Q.withQE
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defaultTxErrorHandler
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[Q.sql|
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SELECT EXISTS
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( SELECT 1 FROM pg_catalog.pg_available_extensions
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WHERE name = $1
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) |]
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(Identity extensionName)
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False
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-- | The name of the schema in which the graphql-engine will install database extensions.
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newtype ExtensionsSchema = ExtensionsSchema {_unExtensionsSchema :: Text}
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deriving (Eq, FromJSON, ToJSON)
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enablePgcryptoExtension :: forall m. MonadTx m => ExtensionsSchema -> m ()
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enablePgcryptoExtension (ExtensionsSchema extensionsSchema) = do
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pgcryptoAvailable <- isExtensionAvailable "pgcrypto"
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if pgcryptoAvailable
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then createPgcryptoExtension
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else
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throw400 Unexpected $
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"pgcrypto extension is required, but could not find the extension in the "
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<> "PostgreSQL server. Please make sure this extension is available."
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where
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createPgcryptoExtension :: m ()
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createPgcryptoExtension =
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liftTx $
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Q.unitQE
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needsPGCryptoError
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(Q.fromText $ "CREATE EXTENSION IF NOT EXISTS pgcrypto SCHEMA " <> extensionsSchema)
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()
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False
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where
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needsPGCryptoError e@(Q.PGTxErr _ _ _ err) =
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case err of
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Q.PGIUnexpected _ -> requiredError
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Q.PGIStatement pgErr -> case Q.edStatusCode pgErr of
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Just "42501" -> err500 PostgresError permissionsMessage
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_ -> requiredError
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where
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requiredError =
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(err500 PostgresError requiredMessage) {qeInternal = Just $ ExtraInternal $ toJSON e}
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requiredMessage =
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"pgcrypto extension is required, but it could not be created;"
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<> " encountered unknown postgres error"
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permissionsMessage =
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"pgcrypto extension is required, but the current user doesn’t have permission to"
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<> " create it. Please grant superuser permission, or setup the initial schema via"
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<> " https://hasura.io/docs/latest/graphql/core/deployment/postgres-permissions.html"
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dropHdbCatalogSchema :: (MonadTx m) => m ()
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dropHdbCatalogSchema =
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liftTx $
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Q.catchE defaultTxErrorHandler $
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-- This is where
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-- 1. Metadata storage:- Metadata and its stateful information stored
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-- 2. Postgres source:- Table event trigger related stuff & insert permission check function stored
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Q.unitQ "DROP SCHEMA IF EXISTS hdb_catalog CASCADE" () False
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