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3cef692dd7
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/8649 GitOrigin-RevId: 4bb9311d1d7ab4e8ee641bde5df2babcb1b8b306
58 lines
2.3 KiB
Haskell
58 lines
2.3 KiB
Haskell
{-# LANGUAGE QuasiQuotes #-}
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module Hasura.Backends.BigQuery.Schema.Introspection
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( listAllTables,
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)
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where
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import Data.Aeson (toJSON)
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import Data.HashMap.Strict.InsOrd qualified as InsOrdHashMap
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import Data.String.Interpolate (i)
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import Data.Text.Lazy qualified as LT
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import Hasura.Backends.BigQuery.Execute (BigQuery (..), OutputValue (..), RecordSet (..), ShowDetails (..))
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import Hasura.Backends.BigQuery.Execute qualified as Execute
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import Hasura.Backends.BigQuery.Source (BigQueryDataset (..), BigQuerySourceConfig (..))
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import Hasura.Backends.BigQuery.Types (TableName (..))
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import Hasura.Base.Error (QErr, throw500, throw500WithDetail)
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import Hasura.Prelude
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import Hasura.RQL.Types.Common (SourceName)
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import Hasura.RQL.Types.Metadata (MetadataM)
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import Hasura.RQL.Types.SchemaCache (CacheRM, askSourceConfig)
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import Hasura.SQL.Backend qualified as Backend
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-- | List all tables, tracked or untracked, on a given BigQuery source. All
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-- given datasets' tables will be included.
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listAllTables :: (CacheRM m, MetadataM m, MonadError QErr m, MonadIO m) => env -> SourceName -> m [TableName]
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listAllTables _ sourceName = do
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sourceConfig <- askSourceConfig @'Backend.BigQuery sourceName
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let queryPerDataset :: BigQueryDataset -> LT.Text
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queryPerDataset (BigQueryDataset dataset) =
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[i|
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select table_name, table_schema
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FROM #{dataset}.INFORMATION_SCHEMA.TABLES
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|]
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query :: LT.Text
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query =
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LT.intercalate "union all" $
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map queryPerDataset $
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_scDatasets sourceConfig
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(_, recordSet) <-
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Execute.streamBigQuery (_scConnection sourceConfig) (BigQuery query mempty)
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`onLeftM` \err -> throw500WithDetail (Execute.executeProblemMessage HideDetails err) (toJSON err)
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results <- for (toList (rows recordSet)) \row -> do
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tableName <- case InsOrdHashMap.lookup "table_name" row of
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Just (TextOutputValue tableName) -> pure tableName
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_ -> throw500 "Unexpected BigQuery introspection result (table_name)"
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tableNameSchema <- case InsOrdHashMap.lookup "table_schema" row of
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Just (TextOutputValue tableNameSchema) -> pure tableNameSchema
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_ -> throw500 "Unexpected BigQuery introspection result (table_schema)"
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pure (tableName, tableNameSchema)
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pure [TableName {..} | (tableName, tableNameSchema) <- results]
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