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This commit applies ormolu to the whole Haskell code base by running `make format`. For in-flight branches, simply merging changes from `main` will result in merge conflicts. To avoid this, update your branch using the following instructions. Replace `<format-commit>` by the hash of *this* commit. $ git checkout my-feature-branch $ git merge <format-commit>^ # and resolve conflicts normally $ make format $ git commit -a -m "reformat with ormolu" $ git merge -s ours post-ormolu https://github.com/hasura/graphql-engine-mono/pull/2404 GitOrigin-RevId: 75049f5c12f430c615eafb4c6b8e83e371e01c8e
73 lines
2.1 KiB
Haskell
73 lines
2.1 KiB
Haskell
module Hasura.SQL.Backend
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( PostgresKind (..),
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BackendType (..),
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backendShortName,
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supportedBackends,
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)
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where
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import Data.Aeson
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import Data.List.Extended (uniques)
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import Data.Proxy
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import Data.Text (unpack)
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import Data.Text.Extended
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import Hasura.Incremental
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import Hasura.Prelude
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-- | Argument to Postgres; we represent backends which are variations on Postgres as sub-types of
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-- Postgres. This value indicates which "flavour" of Postgres a backend is.
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data PostgresKind
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= Vanilla
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| Citus
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deriving (Show, Eq, Ord)
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-- | An enum that represents each backend we support.
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data BackendType
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= Postgres PostgresKind
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| MSSQL
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| BigQuery
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| MySQL
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deriving (Show, Eq, Ord)
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-- | The name of the backend, as we expect it to appear in our metadata and API.
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instance ToTxt BackendType where
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toTxt (Postgres Vanilla) = "postgres"
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toTxt (Postgres Citus) = "citus"
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toTxt MSSQL = "mssql"
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toTxt BigQuery = "bigquery"
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toTxt MySQL = "mysql"
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-- | The FromJSON instance uses this lookup mechanism to avoid having to duplicate and hardcode the
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-- backend string. We accept both the short form and the long form of the backend's name.
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instance FromJSON BackendType where
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parseJSON = withText "backend type" \name -> do
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let knownBackends =
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supportedBackends >>= \b ->
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[ (toTxt b, b), -- long form
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(backendShortName b, b) -- short form
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]
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uniqueBackends = commaSeparated $ fst <$> uniques knownBackends
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lookup name knownBackends
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`onNothing` fail ("got: " <> unpack name <> ", expected one of: " <> unpack uniqueBackends)
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instance ToJSON BackendType where
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toJSON = String . toTxt
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instance Cacheable (Proxy (b :: BackendType))
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-- | Some generated APIs use a shortened version of the backend's name rather than its full
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-- name. This function returns the "short form" of a backend, if any.
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backendShortName :: BackendType -> Text
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backendShortName = \case
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Postgres Vanilla -> "pg"
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b -> toTxt b
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supportedBackends :: [BackendType]
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supportedBackends =
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[ Postgres Vanilla,
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Postgres Citus,
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MSSQL,
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BigQuery,
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MySQL
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]
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