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306162f477
### Description This PR removes `ServerConfigCtx` and `HasServerConfigCtx`. Instead, it favours different approaches: - when the code was only using one field, it passes that field explicitly (usually `SQLGenCtx` or `CheckFeatureFlag`) - when the code was using several fields, but in only one function, it inlines - for the cache build, it introduces `CacheStaticConfig` and `CacheDynamicConfig`, which are subsets of `AppEnv` and `AppContext` respectively The main goal of this is to help with the modularization of the engine: as `ServerConfigCtx` had fields whose types were imported from several unrelated parts of the engine, using it tied together parts of the engine that should not be aware of one another (such as tying together `Hasura.LogicalModel` and `Hasura.GraphQL.Schema`). The bulk of this PR is a change to the cache build, as a follow up to #8509: instead of giving the entire `ServerConfigCtx` as a incremental rule argument, we only give the new `CacheDynamicConfig` struct, which has fewer fields. The other required fields, that were coming from the `AppEnv`, are now given via the `HasCacheStaticConfig` constraint, which is a "subset" of `HasAppEnv`. (Some further work could include moving `StringifyNumbers` out of `GraphQL.Schema.Options`, given how it is used all across the codebase, including in `RQL.DML`.) PR-URL: https://github.com/hasura/graphql-engine-mono/pull/8513 GitOrigin-RevId: 818cbcd71494e3cd946b06adbb02ca328a8a298e
486 lines
19 KiB
Haskell
486 lines
19 KiB
Haskell
{-# LANGUAGE QuasiQuotes #-}
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{-# LANGUAGE TemplateHaskell #-}
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-- | Postgres DDL RunSQL
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--
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-- Escape hatch for running raw SQL against a postgres database.
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--
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-- 'runRunSQL' executes the provided raw SQL.
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--
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-- 'isSchemaCacheBuildRequiredRunSQL' checks for known schema-mutating keywords
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-- in the raw SQL text.
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--
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-- See 'Hasura.Server.API.V2Query' and 'Hasura.Server.API.Query'.
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module Hasura.Backends.Postgres.DDL.RunSQL
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( runRunSQL,
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RunSQL (..),
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isReadOnly,
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isSchemaCacheBuildRequiredRunSQL,
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)
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where
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import Control.Monad.Trans.Control (MonadBaseControl)
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import Data.Aeson
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import Data.HashMap.Strict qualified as M
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import Data.HashSet qualified as HS
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import Data.List.NonEmpty qualified as NE
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import Data.Text.Extended
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import Database.PG.Query qualified as PG
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import Hasura.Backends.Postgres.Connection.MonadTx
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import Hasura.Backends.Postgres.DDL.EventTrigger
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import Hasura.Backends.Postgres.DDL.Source
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( FetchFunctionMetadata,
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FetchTableMetadata,
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ToMetadataFetchQuery,
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fetchFunctionMetadata,
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fetchTableMetadata,
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)
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import Hasura.Backends.Postgres.Execute.Types
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import Hasura.Backends.Postgres.SQL.Types hiding (FunctionName, TableName)
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import Hasura.Base.Error
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import Hasura.EncJSON
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import Hasura.Function.Cache
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import Hasura.Prelude
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import Hasura.RQL.DDL.Schema
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import Hasura.RQL.DDL.Schema.Diff qualified as Diff
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import Hasura.RQL.Types.Backend
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import Hasura.RQL.Types.Common
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import Hasura.RQL.Types.ComputedField
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import Hasura.RQL.Types.EventTrigger
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import Hasura.RQL.Types.Metadata hiding
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( tmComputedFields,
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tmTable,
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)
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import Hasura.RQL.Types.Metadata.Backend
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import Hasura.RQL.Types.SchemaCache
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import Hasura.RQL.Types.SchemaCache.Build
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import Hasura.RQL.Types.SchemaCacheTypes
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import Hasura.RQL.Types.Source
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import Hasura.RQL.Types.Table
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import Hasura.SQL.AnyBackend qualified as AB
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import Hasura.SQL.Backend
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import Hasura.Server.Utils (quoteRegex)
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import Hasura.Session
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import Hasura.Tracing qualified as Tracing
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import Text.Regex.TDFA qualified as TDFA
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data RunSQL = RunSQL
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{ rSql :: Text,
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rSource :: SourceName,
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rCascade :: Bool,
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rCheckMetadataConsistency :: Maybe Bool,
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rTxAccessMode :: PG.TxAccess
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}
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deriving (Show, Eq)
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instance FromJSON RunSQL where
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parseJSON = withObject "RunSQL" $ \o -> do
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rSql <- o .: "sql"
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rSource <- o .:? "source" .!= defaultSource
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rCascade <- o .:? "cascade" .!= False
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rCheckMetadataConsistency <- o .:? "check_metadata_consistency"
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readOnly <- o .:? "read_only" .!= False
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let rTxAccessMode = if readOnly then PG.ReadOnly else PG.ReadWrite
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pure RunSQL {..}
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instance ToJSON RunSQL where
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toJSON RunSQL {..} =
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object
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[ "sql" .= rSql,
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"source" .= rSource,
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"cascade" .= rCascade,
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"check_metadata_consistency" .= rCheckMetadataConsistency,
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"read_only"
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.= case rTxAccessMode of
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PG.ReadOnly -> True
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PG.ReadWrite -> False
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]
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-- | Check for known schema-mutating keywords in the raw SQL text.
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--
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-- See Note [Checking metadata consistency in run_sql].
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isSchemaCacheBuildRequiredRunSQL :: RunSQL -> Bool
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isSchemaCacheBuildRequiredRunSQL RunSQL {..} =
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case rTxAccessMode of
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PG.ReadOnly -> False
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PG.ReadWrite -> fromMaybe (containsDDLKeyword rSql) rCheckMetadataConsistency
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where
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containsDDLKeyword =
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TDFA.match
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$$( quoteRegex
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TDFA.defaultCompOpt
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{ TDFA.caseSensitive = False,
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TDFA.multiline = True,
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TDFA.lastStarGreedy = True
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}
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TDFA.defaultExecOpt
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{ TDFA.captureGroups = False
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}
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"\\balter\\b|\\bdrop\\b|\\breplace\\b|\\bcreate function\\b|\\bcomment on\\b"
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)
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isReadOnly :: RunSQL -> Bool
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isReadOnly runsql =
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case rTxAccessMode runsql of
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PG.ReadOnly -> True
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PG.ReadWrite -> False
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{- Note [Checking metadata consistency in run_sql]
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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SQL queries executed by run_sql may change the Postgres schema in arbitrary
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ways. We attempt to automatically update the metadata to reflect those changes
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as much as possible---for example, if a table is renamed, we want to update the
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metadata to track the table under its new name instead of its old one. This
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schema diffing (plus some integrity checking) is handled by withMetadataCheck.
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But this process has overhead---it involves reloading the metadata, diffing it,
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and rebuilding the schema cache---so we don’t want to do it if it isn’t
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necessary. The user can explicitly disable the check via the
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check_metadata_consistency option, and we also skip it if the current
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transaction is in READ ONLY mode, since the schema can’t be modified in that
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case, anyway.
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However, even if neither read_only or check_metadata_consistency is passed, lots
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of queries may not modify the schema at all. As a (fairly stupid) heuristic, we
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check if the query contains any keywords for DDL operations, and if not, we skip
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the metadata check as well. -}
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-- | Fetch metadata of tracked tables/functions and build @'Diff.TableMeta'/@'Diff.FunctionMeta'
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-- to calculate diff later in @'withMetadataCheck'.
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fetchTablesFunctionsMetadata ::
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forall pgKind m.
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( ToMetadataFetchQuery pgKind,
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FetchTableMetadata pgKind,
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FetchFunctionMetadata pgKind,
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BackendMetadata ('Postgres pgKind),
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MonadTx m
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) =>
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TableCache ('Postgres pgKind) ->
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HS.HashSet (TableName ('Postgres pgKind)) ->
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HS.HashSet (FunctionName ('Postgres pgKind)) ->
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m ([Diff.TableMeta ('Postgres pgKind)], [Diff.FunctionMeta ('Postgres pgKind)])
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fetchTablesFunctionsMetadata tableCache tables functions = do
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tableMetaInfos <- fetchTableMetadata tables
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functionMetaInfos <- fetchFunctionMetadata @pgKind functions
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let functionMetas =
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[ functionMeta
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| function <- HS.toList functions,
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functionMeta <- mkFunctionMetas functionMetaInfos function
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]
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let tableMetas =
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[ Diff.TableMeta table tableMetaInfo computedFieldInfos
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| (table, tableMetaInfo) <- M.toList tableMetaInfos,
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let computedFieldInfos =
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[ computedFieldMeta
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| Just tableInfo <- pure (M.lookup table tableCache),
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computedField <- getComputedFields tableInfo,
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computedFieldMeta <-
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[ Diff.ComputedFieldMeta fieldName functionMeta
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| let fieldName = _cfiName computedField
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function = _cffName $ _cfiFunction computedField,
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functionMeta <- mkFunctionMetas functionMetaInfos function
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]
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]
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]
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pure (tableMetas, functionMetas)
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where
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mkFunctionMetas ::
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HashMap QualifiedFunction (FunctionOverloads ('Postgres pgKind)) ->
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QualifiedFunction ->
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[Diff.FunctionMeta ('Postgres pgKind)]
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mkFunctionMetas functionMetaInfos function =
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[ Diff.FunctionMeta (rfiOid rawInfo) function (rfiFunctionType rawInfo)
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| -- It would seem like we could feasibly detect function overloads here already,
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-- But that is handled elsewhere.
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Just overloads <- pure (M.lookup function functionMetaInfos),
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rawInfo <- NE.toList $ getFunctionOverloads overloads
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]
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-- | Used as an escape hatch to run raw SQL against a database.
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runRunSQL ::
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forall (pgKind :: PostgresKind) m.
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( BackendMetadata ('Postgres pgKind),
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ToMetadataFetchQuery pgKind,
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FetchTableMetadata pgKind,
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FetchFunctionMetadata pgKind,
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CacheRWM m,
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MetadataM m,
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MonadBaseControl IO m,
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MonadError QErr m,
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MonadIO m,
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Tracing.MonadTrace m,
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UserInfoM m
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) =>
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SQLGenCtx ->
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RunSQL ->
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m EncJSON
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runRunSQL sqlGen q@RunSQL {..} = do
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sourceConfig <- askSourceConfig @('Postgres pgKind) rSource
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traceCtx <- Tracing.currentContext
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userInfo <- askUserInfo
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let pgExecCtx = _pscExecCtx sourceConfig
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if (isSchemaCacheBuildRequiredRunSQL q)
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then do
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-- see Note [Checking metadata consistency in run_sql]
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withMetadataCheck @pgKind sqlGen rSource rCascade rTxAccessMode $
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withTraceContext traceCtx $
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withUserInfo userInfo $
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execRawSQL rSql
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else do
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runTxWithCtx pgExecCtx (Tx rTxAccessMode Nothing) RunSQLQuery $ execRawSQL rSql
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where
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execRawSQL :: (MonadTx n) => Text -> n EncJSON
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execRawSQL =
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fmap (encJFromJValue @RunSQLRes) . liftTx . PG.multiQE rawSqlErrHandler . PG.fromText
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where
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rawSqlErrHandler txe =
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(err400 PostgresError "query execution failed") {qeInternal = Just $ ExtraInternal $ toJSON txe}
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-- | @'withMetadataCheck' source cascade txAccess runSQLQuery@ executes @runSQLQuery@ and checks if the schema changed as a
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-- result. If it did, it checks to ensure the changes do not violate any integrity constraints, and
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-- if not, incorporates them into the schema cache.
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-- TODO(antoine): shouldn't this be generalized?
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withMetadataCheck ::
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forall (pgKind :: PostgresKind) a m.
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( BackendMetadata ('Postgres pgKind),
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ToMetadataFetchQuery pgKind,
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FetchTableMetadata pgKind,
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FetchFunctionMetadata pgKind,
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CacheRWM m,
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MetadataM m,
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MonadBaseControl IO m,
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MonadError QErr m,
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MonadIO m
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) =>
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SQLGenCtx ->
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SourceName ->
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Bool ->
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PG.TxAccess ->
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PG.TxET QErr m a ->
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m a
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withMetadataCheck sqlGen source cascade txAccess runSQLQuery = do
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SourceInfo _ tableCache functionCache _logicalModels _customReturnTypes sourceConfig _ _ <- askSourceInfo @('Postgres pgKind) source
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-- Run SQL query and metadata checker in a transaction
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(queryResult, metadataUpdater) <- runTxWithMetadataCheck source sourceConfig txAccess tableCache functionCache cascade runSQLQuery
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-- Build schema cache with updated metadata
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withNewInconsistentObjsCheck $
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buildSchemaCacheWithInvalidations mempty {ciSources = HS.singleton source} metadataUpdater
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postRunSQLSchemaCache <- askSchemaCache
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-- Recreate event triggers in hdb_catalog. Event triggers are dropped before executing @'runSQLQuery'.
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recreateEventTriggers sourceConfig postRunSQLSchemaCache
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pure queryResult
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where
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recreateEventTriggers :: PGSourceConfig -> SchemaCache -> m ()
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recreateEventTriggers sourceConfig schemaCache = do
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let tables = fromMaybe mempty $ unsafeTableCache @('Postgres pgKind) source $ scSources schemaCache
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liftEitherM $
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runPgSourceWriteTx sourceConfig RunSQLQuery $
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forM_ (M.elems tables) $ \(TableInfo coreInfo _ eventTriggers _) -> do
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let table = _tciName coreInfo
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columns = getCols $ _tciFieldInfoMap coreInfo
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forM_ (M.toList eventTriggers) $ \(triggerName, EventTriggerInfo {etiOpsDef, etiTriggerOnReplication}) -> do
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flip runReaderT sqlGen $
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mkAllTriggersQ triggerName table etiTriggerOnReplication columns etiOpsDef
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-- | @'runTxWithMetadataCheck source sourceConfig txAccess tableCache functionCache cascadeDependencies tx' checks for
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-- changes in GraphQL Engine metadata when a @'tx' is executed on the database alters Postgres
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-- schema of tables and functions. If any indirect dependencies (Eg. remote table dependence of a relationship) are
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-- found and @'cascadeDependencies' is False, then an exception is raised.
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runTxWithMetadataCheck ::
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forall m a (pgKind :: PostgresKind).
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( BackendMetadata ('Postgres pgKind),
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ToMetadataFetchQuery pgKind,
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FetchTableMetadata pgKind,
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FetchFunctionMetadata pgKind,
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CacheRWM m,
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MonadIO m,
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MonadBaseControl IO m,
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MonadError QErr m
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) =>
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SourceName ->
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SourceConfig ('Postgres pgKind) ->
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PG.TxAccess ->
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TableCache ('Postgres pgKind) ->
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FunctionCache ('Postgres pgKind) ->
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Bool ->
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PG.TxET QErr m a ->
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m (a, MetadataModifier)
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runTxWithMetadataCheck source sourceConfig txAccess tableCache functionCache cascadeDependencies tx =
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liftEitherM $
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runExceptT $
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_pecRunTx (_pscExecCtx sourceConfig) (PGExecCtxInfo (Tx txAccess Nothing) RunSQLQuery) $ do
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-- Running in a transaction helps to rollback the @'tx' execution in case of any exceptions
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-- Before running the @'tx', fetch metadata of existing tables and functions from Postgres.
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let tableNames = M.keysSet tableCache
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computedFieldFunctions = mconcat $ map getComputedFieldFunctions (M.elems tableCache)
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functionNames = M.keysSet functionCache <> computedFieldFunctions
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(preTxTablesMeta, preTxFunctionsMeta) <- fetchTablesFunctionsMetadata tableCache tableNames functionNames
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-- Since the @'tx' may alter table/function names we use the OIDs of underlying tables
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-- (sourced from 'pg_class' for tables and 'pg_proc' for functions), which remain unchanged in the
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-- case if a table/function is renamed.
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let tableOids = HS.fromList $ map (_ptmiOid . Diff.tmInfo) preTxTablesMeta
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functionOids = HS.fromList $ map Diff.fmOid preTxFunctionsMeta
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-- Run the transaction
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txResult <- tx
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(postTxTablesMeta, postTxFunctionMeta) <-
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uncurry (fetchTablesFunctionsMetadata tableCache)
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-- Fetch names of tables and functions using OIDs which also contains renamed items
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=<< fetchTablesFunctionsFromOids tableOids functionOids
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-- Calculate the tables diff (dropped & altered tables)
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let tablesDiff = Diff.getTablesDiff preTxTablesMeta postTxTablesMeta
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-- Calculate the functions diff. For calculating diff for functions, only consider
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-- query/mutation functions and exclude functions underpinning computed fields.
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-- Computed field functions are being processed under each table diff.
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-- See @'getTablesDiff' and @'Diff.processTablesDiff'
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excludeComputedFieldFunctions = filter ((`M.member` functionCache) . Diff.fmFunction)
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functionsDiff =
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Diff.getFunctionsDiff
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(excludeComputedFieldFunctions preTxFunctionsMeta)
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(excludeComputedFieldFunctions postTxFunctionMeta)
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dontAllowFunctionOverloading $
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Diff.getOverloadedFunctions
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(M.keys functionCache)
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(excludeComputedFieldFunctions postTxFunctionMeta)
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-- Update metadata with schema change caused by @'tx'
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metadataUpdater <- execWriterT do
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-- Collect indirect dependencies of altered tables
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tableIndirectDeps <- Diff.getIndirectDependenciesFromTableDiff source tablesDiff
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-- If table indirect dependencies exist and cascading is not enabled then report an exception
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unless (null tableIndirectDeps || cascadeDependencies) $ reportDependentObjectsExist tableIndirectDeps
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-- Purge all the table dependents
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traverse_ purgeSourceAndSchemaDependencies tableIndirectDeps
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-- Collect function names from purged table dependencies
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let purgedFunctions = collectFunctionsInDeps tableIndirectDeps
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Diff.FunctionsDiff droppedFunctions alteredFunctions = functionsDiff
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-- Drop functions in metadata. Exclude functions that were already dropped as part of table indirect dependencies
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purgeFunctionsFromMetadata $ droppedFunctions \\ purgedFunctions
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-- If any function type is altered to VOLATILE then raise an exception
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dontAllowFunctionAlteredVolatile alteredFunctions
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-- Propagate table changes to metadata
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Diff.processTablesDiff source tableCache tablesDiff
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pure (txResult, metadataUpdater)
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where
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dontAllowFunctionOverloading ::
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MonadError QErr n =>
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[FunctionName ('Postgres pgKind)] ->
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n ()
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dontAllowFunctionOverloading overloadedFunctions =
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unless (null overloadedFunctions) $
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throw400 NotSupported $
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"the following tracked function(s) cannot be overloaded: "
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<> commaSeparated overloadedFunctions
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dontAllowFunctionAlteredVolatile ::
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MonadError QErr n =>
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[(FunctionName ('Postgres pgKind), FunctionVolatility)] ->
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n ()
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dontAllowFunctionAlteredVolatile alteredFunctions =
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forM_ alteredFunctions $ \(qf, newTy) -> do
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when (newTy == FTVOLATILE) $
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throw400 NotSupported $
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"type of function " <> qf <<> " is altered to \"VOLATILE\" which is not supported now"
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purgeFunctionsFromMetadata ::
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Monad n =>
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[FunctionName ('Postgres pgKind)] ->
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WriterT MetadataModifier n ()
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purgeFunctionsFromMetadata functions =
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for_ functions $ tell . dropFunctionInMetadata @('Postgres pgKind) source
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collectFunctionsInDeps :: [SchemaObjId] -> [FunctionName ('Postgres pgKind)]
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collectFunctionsInDeps deps =
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flip mapMaybe deps \case
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SOSourceObj _ objectID
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| Just (SOIFunction qf) <- AB.unpackAnyBackend @('Postgres pgKind) objectID ->
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Just qf
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_ -> Nothing
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-- | Fetch list of tables and functions with provided oids
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fetchTablesFunctionsFromOids ::
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(MonadIO m) =>
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HashSet OID ->
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HashSet OID ->
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PG.TxET
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QErr
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m
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( HS.HashSet (TableName ('Postgres pgKind)),
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HS.HashSet (FunctionName ('Postgres pgKind))
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)
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fetchTablesFunctionsFromOids tableOids functionOids =
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((PG.getViaJSON *** PG.getViaJSON) . PG.getRow)
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<$> PG.withQE
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defaultTxErrorHandler
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[PG.sql|
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SELECT
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COALESCE(
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( SELECT
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json_agg(
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row_to_json(
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(
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SELECT e
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FROM ( SELECT "table".relname AS "name",
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"schema".nspname AS "schema"
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) AS e
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)
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)
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) AS "item"
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FROM jsonb_to_recordset($1::jsonb) AS oid_table("oid" int)
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JOIN pg_catalog.pg_class "table" ON ("table".oid = "oid_table".oid)
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JOIN pg_catalog.pg_namespace "schema" ON ("schema".oid = "table".relnamespace)
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),
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'[]'
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) AS "tables",
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COALESCE(
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( SELECT
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json_agg(
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row_to_json(
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(
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SELECT e
|
||
FROM ( SELECT "function".proname AS "name",
|
||
"schema".nspname AS "schema"
|
||
) AS e
|
||
)
|
||
)
|
||
) AS "item"
|
||
FROM jsonb_to_recordset($2::jsonb) AS oid_table("oid" int)
|
||
JOIN pg_catalog.pg_proc "function" ON ("function".oid = "oid_table".oid)
|
||
JOIN pg_catalog.pg_namespace "schema" ON ("schema".oid = "function".pronamespace)
|
||
),
|
||
'[]'
|
||
) AS "functions"
|
||
|]
|
||
(PG.ViaJSON $ map mkOidObject $ HS.toList tableOids, PG.ViaJSON $ map mkOidObject $ HS.toList $ functionOids)
|
||
True
|
||
where
|
||
mkOidObject oid = object ["oid" .= oid]
|
||
|
||
------ helpers ------------
|
||
|
||
getComputedFields :: TableInfo ('Postgres pgKind) -> [ComputedFieldInfo ('Postgres pgKind)]
|
||
getComputedFields = getComputedFieldInfos . _tciFieldInfoMap . _tiCoreInfo
|
||
|
||
getComputedFieldFunctions :: TableInfo ('Postgres pgKind) -> HashSet (FunctionName ('Postgres pgKind))
|
||
getComputedFieldFunctions = HS.fromList . map (_cffName . _cfiFunction) . getComputedFields
|