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06b284cf33
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/7476 Co-authored-by: Tom Harding <6302310+i-am-tom@users.noreply.github.com> GitOrigin-RevId: 781c29666e92004dc82918c2292fdacc27fded4c
394 lines
17 KiB
Haskell
394 lines
17 KiB
Haskell
{-# LANGUAGE TemplateHaskell #-}
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-- | Migrations for the Hasura catalog.
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--
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-- To add a new migration:
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--
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-- 1. Bump the catalog version number in @src-rsr/catalog_version.txt@.
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-- 2. Add a migration script in the @src-rsr/migrations/@ directory with the name
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-- @<old version>_to_<new version>.sql@.
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-- 3. Create a downgrade script in the @src-rsr/migrations/@ directory with the name
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-- @<new version>_to_<old version>.sql@.
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-- 4. If making a new release, add the mapping from application version to catalog
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-- schema version in @src-rsr/catalog_versions.txt@.
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-- 5. If appropriate, add the change to @server/src-rsr/initialise.sql@ for fresh installations
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-- of hasura.
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--
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-- The Template Haskell code in this module will automatically compile the new migration script into
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-- the @graphql-engine@ executable.
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--
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-- NOTE: Please have a look at the `server/documentation/migration-guidelines.md` before adding any new migration
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-- if you haven't already looked at it
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module Hasura.Server.Migrate
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( MigrationResult (..),
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migrateCatalog,
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latestCatalogVersion,
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downgradeCatalog,
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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 qualified as A
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import Data.FileEmbed (makeRelativeToProject)
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import Data.HashMap.Strict.InsOrd qualified as OMap
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import Data.Text qualified as T
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import Data.Text.IO qualified as TIO
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import Data.Time.Clock (UTCTime)
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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.Execute.Types
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import Hasura.Backends.Postgres.SQL.Types
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import Hasura.Base.Error
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import Hasura.Logging (Hasura, LogLevel (..), ToEngineLog (..))
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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.LegacyCatalog
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import Hasura.RQL.Types.ApiLimit
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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.CustomTypes
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import Hasura.RQL.Types.Metadata
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import Hasura.RQL.Types.Network
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import Hasura.RQL.Types.OpenTelemetry (emptyOpenTelemetryConfig)
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import Hasura.RQL.Types.SourceCustomization
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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.Init (DowngradeOptions (..), databaseUrlOption, _envVar)
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import Hasura.Server.Logging (StartupLog (..))
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import Hasura.Server.Migrate.Internal
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import Hasura.Server.Migrate.LatestVersion
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import Hasura.Server.Migrate.Version
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import Hasura.Server.Types (MaintenanceMode (..))
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import Language.Haskell.TH.Lib qualified as TH
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import Language.Haskell.TH.Syntax qualified as TH
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import System.Directory (doesFileExist)
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data MigrationResult
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= MRNothingToDo
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| MRInitialized
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| -- | old catalog version
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MRMigrated Text
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| MRMaintanenceMode
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deriving (Show, Eq)
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instance ToEngineLog MigrationResult Hasura where
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toEngineLog result =
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toEngineLog $
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StartupLog
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{ slLogLevel = LevelInfo,
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slKind = "catalog_migrate",
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slInfo = A.toJSON $ case result of
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MRNothingToDo ->
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"Already at the latest catalog version ("
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<> latestCatalogVersionString
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<> "); nothing to do."
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MRInitialized ->
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"Successfully initialized the catalog (at version " <> latestCatalogVersionString <> ")."
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MRMigrated oldVersion ->
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"Successfully migrated from catalog version "
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<> oldVersion
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<> " to version "
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<> latestCatalogVersionString
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<> "."
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MRMaintanenceMode ->
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"Catalog migrations are skipped because the graphql-engine is in maintenance mode"
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}
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-- A migration and (hopefully) also its inverse if we have it.
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-- Polymorphic because `m` can be any `MonadTx`, `MonadIO` when
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-- used in the `migrations` function below.
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data MigrationPair m = MigrationPair
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{ mpMigrate :: m (),
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mpDown :: Maybe (m ())
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}
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migrateCatalog ::
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forall m.
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( MonadTx m,
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MonadIO m,
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MonadBaseControl IO m
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) =>
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Maybe (SourceConnConfiguration ('Postgres 'Vanilla)) ->
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ExtensionsSchema ->
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MaintenanceMode () ->
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UTCTime ->
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m (MigrationResult, Metadata)
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migrateCatalog maybeDefaultSourceConfig extensionsSchema maintenanceMode migrationTime = do
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catalogSchemaExists <- doesSchemaExist (SchemaName "hdb_catalog")
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versionTableExists <- doesTableExist (SchemaName "hdb_catalog") (TableName "hdb_version")
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metadataTableExists <- doesTableExist (SchemaName "hdb_catalog") (TableName "hdb_metadata")
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migrationResult <-
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if
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| maintenanceMode == (MaintenanceModeEnabled ()) -> do
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if
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| not catalogSchemaExists ->
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throw500 "unexpected: hdb_catalog schema not found in maintenance mode"
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| not versionTableExists ->
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throw500 "unexpected: hdb_catalog.hdb_version table not found in maintenance mode"
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| not metadataTableExists ->
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throw500 $
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"the \"hdb_catalog.hdb_metadata\" table is expected to exist and contain"
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<> " the metadata of the graphql-engine"
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| otherwise -> pure MRMaintanenceMode
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| otherwise -> case catalogSchemaExists of
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False -> initialize True
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True -> case versionTableExists of
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False -> initialize False
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True -> migrateFrom =<< liftTx getCatalogVersion
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metadata <- liftTx fetchMetadataFromCatalog
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pure (migrationResult, metadata)
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where
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-- initializes the catalog, creating the schema if necessary
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initialize :: Bool -> m MigrationResult
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initialize createSchema = do
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liftTx $
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PG.catchE defaultTxErrorHandler $
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when createSchema $
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PG.unitQ "CREATE SCHEMA hdb_catalog" () False
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enablePgcryptoExtension extensionsSchema
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multiQ $(makeRelativeToProject "src-rsr/initialise.sql" >>= PG.sqlFromFile)
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updateCatalogVersion
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let emptyMetadata' = case maybeDefaultSourceConfig of
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Nothing -> emptyMetadata
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Just defaultSourceConfig ->
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-- insert metadata with default source
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let defaultSourceMetadata =
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AB.mkAnyBackend $
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SourceMetadata
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@('Postgres 'Vanilla)
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defaultSource
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PostgresVanillaKind
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mempty
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mempty
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mempty
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defaultSourceConfig
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Nothing
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emptySourceCustomization
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Nothing
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sources = OMap.singleton defaultSource $ BackendSourceMetadata defaultSourceMetadata
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in emptyMetadata {_metaSources = sources}
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liftTx $ insertMetadataInCatalog emptyMetadata'
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pure MRInitialized
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-- migrates an existing catalog to the latest version from an existing verion
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migrateFrom :: MetadataCatalogVersion -> m MigrationResult
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migrateFrom previousVersion
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| previousVersion == latestCatalogVersion = pure MRNothingToDo
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| otherwise = do
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let upMigrations = migrations maybeDefaultSourceConfig False maintenanceMode
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case neededMigrations previousVersion upMigrations of
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[] ->
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throw400 NotSupported $
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"Cannot use database previously used with a newer version of graphql-engine (expected"
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<> " a catalog version <="
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<> latestCatalogVersionString
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<> ", but the current version"
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<> " is "
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<> tshow previousVersion
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<> ")."
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migrationsToBeApplied -> do
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traverse_ (mpMigrate . snd) migrationsToBeApplied
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updateCatalogVersion
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pure . MRMigrated $ tshow previousVersion
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where
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neededMigrations prevVersion upMigrations =
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dropWhile ((< prevVersion) . fst) upMigrations
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updateCatalogVersion = setCatalogVersion latestCatalogVersionString migrationTime
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downgradeCatalog ::
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forall m.
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(MonadIO m, MonadTx m) =>
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Maybe (SourceConnConfiguration ('Postgres 'Vanilla)) ->
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DowngradeOptions ->
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UTCTime ->
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m MigrationResult
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downgradeCatalog defaultSourceConfig opts time = do
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currentCatalogVersion <- liftTx getCatalogVersion
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targetVersionFloat :: MetadataCatalogVersion <-
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onLeft (readEither (T.unpack $ dgoTargetVersion opts)) $ \err ->
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throw500 $ "Unexpected: couldn't convert " <> dgoTargetVersion opts <> " to a float, error: " <> tshow err
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downgradeFrom currentCatalogVersion targetVersionFloat
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where
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-- downgrades an existing catalog to the specified version
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downgradeFrom :: MetadataCatalogVersion -> MetadataCatalogVersion -> m MigrationResult
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downgradeFrom previousVersion targetVersion
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| previousVersion == targetVersion = pure MRNothingToDo
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| otherwise =
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case neededDownMigrations targetVersion of
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Left reason ->
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throw400 NotSupported $
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"This downgrade path (from "
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<> tshow previousVersion
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<> " to "
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<> dgoTargetVersion opts
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<> ") is not supported, because "
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<> reason
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Right path -> do
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sequence_ path
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unless (dgoDryRun opts) do
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setCatalogVersion (dgoTargetVersion opts) time
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pure (MRMigrated (dgoTargetVersion opts))
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where
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neededDownMigrations newVersion =
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downgrade
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previousVersion
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newVersion
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(reverse (migrations defaultSourceConfig (dgoDryRun opts) MaintenanceModeDisabled))
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downgrade ::
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MetadataCatalogVersion ->
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MetadataCatalogVersion ->
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[(MetadataCatalogVersion, MigrationPair m)] ->
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Either Text [m ()]
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downgrade lower upper = skipFutureDowngrades
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where
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-- We find the list of downgrade scripts to run by first
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-- dropping any downgrades which correspond to newer versions
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-- of the schema than the one we're running currently.
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-- Then we take migrations as needed until we reach the target
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-- version, dropping any remaining migrations from the end of the
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-- (reversed) list.
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skipFutureDowngrades, dropOlderDowngrades :: [(MetadataCatalogVersion, MigrationPair m)] -> Either Text [m ()]
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skipFutureDowngrades xs | previousVersion == lower = dropOlderDowngrades xs
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skipFutureDowngrades [] = Left "the starting version is unrecognized."
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skipFutureDowngrades ((x, _) : xs)
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| x == lower = dropOlderDowngrades xs
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| otherwise = skipFutureDowngrades xs
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dropOlderDowngrades [] = Left "the target version is unrecognized."
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dropOlderDowngrades ((x, MigrationPair {mpDown = Nothing}) : _) =
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Left $ "there is no available migration back to version " <> tshow x <> "."
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dropOlderDowngrades ((x, MigrationPair {mpDown = Just y}) : xs)
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| x == upper = Right [y]
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| otherwise = (y :) <$> dropOlderDowngrades xs
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migrations ::
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forall m.
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(MonadIO m, MonadTx m) =>
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Maybe (SourceConnConfiguration ('Postgres 'Vanilla)) ->
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Bool ->
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MaintenanceMode () ->
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[(MetadataCatalogVersion, MigrationPair m)]
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migrations maybeDefaultSourceConfig dryRun maintenanceMode =
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-- We need to build the list of migrations at compile-time so that we can compile the SQL
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-- directly into the executable using `Q.sqlFromFile`. The GHC stage restriction makes
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-- doing this a little bit awkward (we can’t use any definitions in this module at
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-- compile-time), but putting a `let` inside the splice itself is allowed.
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$( let migrationFromFile from to =
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let path = "src-rsr/migrations/" <> from <> "_to_" <> to <> ".sql"
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in [|runTxOrPrint $(makeRelativeToProject path >>= PG.sqlFromFile)|]
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migrationFromFileMaybe from to = do
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path <- makeRelativeToProject $ "src-rsr/migrations/" <> from <> "_to_" <> to <> ".sql"
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exists <- TH.runIO (doesFileExist path)
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if exists
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then [|Just (runTxOrPrint $(PG.sqlFromFile path))|]
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else [|Nothing|]
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migrationsFromFile = map $ \(to :: MetadataCatalogVersion) ->
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let from = pred to
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in [|
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( $(TH.lift from),
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MigrationPair
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$(migrationFromFile (show from) (show to))
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$(migrationFromFileMaybe (show to) (show from))
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)
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|]
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in TH.listE
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-- version 0.8 is the only non-integral catalog version
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-- The 40_to_41 migration is consciously omitted from below because its contents
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-- have been moved to the `0_to_1.sql` because the `40_to_41` migration only contained
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-- source catalog changes and we'd like to keep source catalog migrations in a different
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-- path than metadata catalog migrations.
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$
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[|(MetadataCatalogVersion08, MigrationPair $(migrationFromFile "08" "1") Nothing)|]
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: migrationsFromFile [MetadataCatalogVersion 2 .. MetadataCatalogVersion 3]
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++ [|(MetadataCatalogVersion 3, MigrationPair from3To4 Nothing)|]
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: (migrationsFromFile [MetadataCatalogVersion 5 .. MetadataCatalogVersion 40] ++ migrationsFromFile [MetadataCatalogVersion 42])
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++ [|(MetadataCatalogVersion 42, MigrationPair from42To43 (Just from43To42))|]
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: migrationsFromFile [MetadataCatalogVersion 44 .. latestCatalogVersion]
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)
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where
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runTxOrPrint :: PG.Query -> m ()
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runTxOrPrint
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| dryRun =
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liftIO . TIO.putStrLn . PG.getQueryText
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| otherwise = multiQ
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from42To43 = do
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when (maintenanceMode == MaintenanceModeEnabled ()) $
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throw500 "cannot migrate to catalog version 43 in maintenance mode"
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let query = $(makeRelativeToProject "src-rsr/migrations/42_to_43.sql" >>= PG.sqlFromFile)
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if dryRun
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then (liftIO . TIO.putStrLn . PG.getQueryText) query
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else do
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metadataV2 <- fetchMetadataFromHdbTables
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multiQ query
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defaultSourceConfig <-
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onNothing maybeDefaultSourceConfig $
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throw400 NotSupported $
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"cannot migrate to catalog version 43 without --database-url or env var " <> tshow (_envVar databaseUrlOption)
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let metadataV3 =
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let MetadataNoSources {..} = metadataV2
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defaultSourceMetadata =
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BackendSourceMetadata $
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AB.mkAnyBackend $
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SourceMetadata defaultSource PostgresVanillaKind _mnsTables _mnsFunctions mempty defaultSourceConfig Nothing emptySourceCustomization Nothing
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in Metadata
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(OMap.singleton defaultSource defaultSourceMetadata)
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_mnsRemoteSchemas
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_mnsQueryCollections
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_mnsAllowlist
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_mnsCustomTypes
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_mnsActions
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_mnsCronTriggers
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mempty
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emptyApiLimit
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emptyMetricsConfig
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mempty
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mempty
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emptyNetwork
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mempty
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emptyOpenTelemetryConfig
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liftTx $ insertMetadataInCatalog metadataV3
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from43To42 = do
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let query = $(makeRelativeToProject "src-rsr/migrations/43_to_42.sql" >>= PG.sqlFromFile)
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if dryRun
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then (liftIO . TIO.putStrLn . PG.getQueryText) query
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else do
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Metadata {..} <- liftTx fetchMetadataFromCatalog
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multiQ query
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let emptyMetadataNoSources =
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MetadataNoSources mempty mempty mempty mempty mempty emptyCustomTypes mempty mempty
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metadataV2 <- case OMap.toList _metaSources of
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[] -> pure emptyMetadataNoSources
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[(_, BackendSourceMetadata exists)] ->
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pure $ case AB.unpackAnyBackend exists of
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Nothing -> emptyMetadataNoSources
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Just SourceMetadata {..} ->
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MetadataNoSources
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_smTables
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_smFunctions
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_metaRemoteSchemas
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_metaQueryCollections
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_metaAllowlist
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_metaCustomTypes
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_metaActions
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_metaCronTriggers
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_ -> throw400 NotSupported "Cannot downgrade since there are more than one source"
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liftTx $ do
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flip runReaderT (SystemDefined False) $ saveMetadataToHdbTables metadataV2
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-- when the graphql-engine is migrated from v1 to v2, we drop the foreign key
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-- constraint of the `hdb_catalog.hdb_cron_event` table because the cron triggers
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-- in v2 are saved in the `hdb_catalog.hdb_metadata` table. So, when a downgrade
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-- happens, we need to delay adding the foreign key constraint until the
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-- cron triggers are added in the `hdb_catalog.hdb_cron_triggers`
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addCronTriggerForeignKeyConstraint
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recreateSystemMetadata
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multiQ :: (MonadTx m) => PG.Query -> m ()
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multiQ = liftTx . PG.multiQE defaultTxErrorHandler
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