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4e7fbbc2d6
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/7920 Co-authored-by: Rakesh Emmadi <12475069+rakeshkky@users.noreply.github.com> GitOrigin-RevId: 6ebc4d0429fdfecf93950879b69e8b5f8f56b502
359 lines
14 KiB
Haskell
359 lines
14 KiB
Haskell
-- TODO(SOLOMON): Should this be moved into `Data.Environment`?
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module Hasura.Server.Init.Env
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( -- * WithEnv
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WithEnvT (..),
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WithEnv,
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runWithEnvT,
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runWithEnv,
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withOption,
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withOptionDefault,
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withOptions,
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withOptionSwitch,
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withOptionSwitch',
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considerEnv,
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considerEnvs,
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-- * FromEnv
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FromEnv (..),
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)
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where
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--------------------------------------------------------------------------------
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import Control.Monad.Morph qualified as Morph
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import Data.Aeson qualified as Aeson
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import Data.ByteString.Lazy.UTF8 qualified as BLU
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import Data.Char qualified as Char
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import Data.HashSet qualified as HashSet
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import Data.String qualified as String
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import Data.Text qualified as Text
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import Data.Time qualified as Time
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import Data.URL.Template qualified as Template
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import Database.PG.Query qualified as Query
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import Hasura.Backends.Postgres.Connection.MonadTx (ExtensionsSchema)
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import Hasura.Backends.Postgres.Connection.MonadTx qualified as MonadTx
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import Hasura.Cache.Bounded qualified as Cache
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import Hasura.GraphQL.Execute.Subscription.Options qualified as Subscription.Options
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import Hasura.GraphQL.Schema.NamingCase (NamingCase)
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import Hasura.GraphQL.Schema.NamingCase qualified as NamingCase
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import Hasura.GraphQL.Schema.Options qualified as Options
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import Hasura.Logging qualified as Logging
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import Hasura.Prelude
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import Hasura.RQL.Types.Metadata (Metadata, MetadataDefaults (..))
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import Hasura.Server.Auth qualified as Auth
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import Hasura.Server.Cors qualified as Cors
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import Hasura.Server.Init.Config qualified as Config
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import Hasura.Server.Logging qualified as Server.Logging
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import Hasura.Server.Types qualified as Server.Types
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import Hasura.Server.Utils qualified as Utils
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import Hasura.Session qualified as Session
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import Network.Wai.Handler.Warp qualified as Warp
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import Refined (NonNegative, Positive, Refined, refineFail, unrefine)
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--------------------------------------------------------------------------------
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-- | Lookup a key in the application environment then parse the value
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-- with a 'FromEnv' instance'
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considerEnv :: (Monad m, FromEnv a) => String -> WithEnvT m (Maybe a)
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considerEnv envVar = do
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env <- ask
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case lookup envVar env of
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Nothing -> pure Nothing
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Just val -> either throwErr (pure . Just) $ fromEnv val
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where
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throwErr s =
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throwError $
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"Fatal Error:- Environment variable " ++ envVar ++ ": " ++ s
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-- | Lookup a list of keys with 'considerEnv' and return the first
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-- value to parse successfully.
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considerEnvs :: (Monad m, FromEnv a) => [String] -> WithEnvT m (Maybe a)
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considerEnvs envVars = foldl1 (<|>) <$> mapM considerEnv envVars
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-- | Lookup a list of keys with 'withOption' and return the first
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-- value to parse successfully.
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withOptions :: (Monad m, FromEnv option) => Maybe option -> [Config.Option ()] -> WithEnvT m (Maybe option)
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withOptions parsed options = foldl1 (<|>) <$> traverse (withOption parsed) options
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-- | Given the parse result for an option and the 'Option' record
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-- for that option, query the environment, and then merge the results
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-- from the parser and environment.
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withOption :: (Monad m, FromEnv option) => Maybe option -> Config.Option () -> WithEnvT m (Maybe option)
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withOption parsed option =
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let option' = option {Config._default = Nothing}
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in withOptionDefault (fmap Just parsed) option'
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-- | Given the parse result for an option and the 'Option' record for
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-- that option, query the environment, and then merge the results from
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-- the parser, environment, and the default.
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withOptionDefault :: (Monad m, FromEnv option) => Maybe option -> Config.Option option -> WithEnvT m option
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withOptionDefault parsed Config.Option {..} =
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onNothing parsed (fromMaybe _default <$> considerEnv _envVar)
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-- | Switches in 'optparse-applicative' have different semantics then
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-- ordinary flags. They are always optional and produce a 'False' when
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-- absent rather then a 'Nothing'.
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--
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-- In HGE we give Env Vars a higher precedence then an absent Switch
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-- but the ordinary 'withEnv' operation expects a 'Nothing' for an
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-- absent arg parser result.
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--
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-- This function executes with 'withOption Nothing' when the Switch is
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-- absent, otherwise it returns 'True'.
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--
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-- NOTE: An alternative solution might be to make Switches return
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-- 'Maybe _', where '_' is an option specific sum type. This would
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-- allow us to use 'withOptionDefault' directly. Additionally, all
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-- fields of 'ServeOptionsRaw' would become 'Maybe' or 'First' values
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-- which would allow us to write a 'Monoid ServeOptionsRaw' instance
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-- for combing different option sources.
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--
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-- A 'Monoid' instance would be super valuable to cleanup arg/env
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-- parsing but this solution feels somewhat unsatisfying.
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withOptionSwitch :: Monad m => Bool -> Config.Option Bool -> WithEnvT m Bool
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withOptionSwitch parsed option = withOptionSwitch' parsed (id, id) option
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-- | Given an 'Iso a Bool' we can apply the same boolean env merging
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-- semantics as we do for 'Bool' in `withOptionsSwitch' to @a@.
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withOptionSwitch' :: Monad m => a -> (a -> Bool, Bool -> a) -> Config.Option a -> WithEnvT m a
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withOptionSwitch' parsed (fwd, bwd) option =
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if fwd parsed
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then pure (bwd True)
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else fmap bwd $ withOptionDefault Nothing (fmap fwd option)
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--------------------------------------------------------------------------------
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-- | A 'Read' style parser used for consuming Env Vars and building
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-- 'ReadM' parsers for 'optparse-applicative'.
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class FromEnv a where
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fromEnv :: String -> Either String a
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type WithEnv = WithEnvT Identity
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-- NOTE: Should we use `Data.Environment.Environment` for context?
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-- | The monadic context for querying Env Vars.
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newtype WithEnvT m a = WithEnvT {unWithEnvT :: ReaderT [(String, String)] (ExceptT String m) a}
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deriving newtype (Functor, Applicative, Monad, MonadReader [(String, String)], MonadError String, MonadIO)
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instance MonadTrans WithEnvT where
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lift = WithEnvT . lift . lift
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instance Morph.MFunctor WithEnvT where
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hoist f (WithEnvT m) = WithEnvT $ Morph.hoist (Morph.hoist f) m
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-- | Given an environment run a 'WithEnv' action producing either a
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-- parse error or an @a@.
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runWithEnv :: [(String, String)] -> WithEnv a -> Either String a
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runWithEnv env (WithEnvT m) = runIdentity $ runExceptT $ runReaderT m env
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-- | Given an environment run a 'WithEnvT' action producing either a
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-- parse error or an @a@.
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runWithEnvT :: [(String, String)] -> WithEnvT m a -> m (Either String a)
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runWithEnvT env (WithEnvT m) = runExceptT $ runReaderT m env
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--------------------------------------------------------------------------------
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-- Deserialize from seconds, in the usual way
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instance FromEnv Time.NominalDiffTime where
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fromEnv s =
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case (readMaybe s :: Maybe Double) of
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Nothing -> Left "could not parse as a Double"
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Just i -> Right $ realToFrac i
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instance FromEnv Time.DiffTime where
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fromEnv s =
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case (readMaybe s :: Maybe Seconds) of
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Nothing -> Left "could not parse as a Double"
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Just i -> Right $ seconds i
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instance FromEnv String where
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fromEnv = Right
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instance FromEnv Warp.HostPreference where
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fromEnv = Right . String.fromString
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instance FromEnv Text where
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fromEnv = Right . Text.pack
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instance FromEnv a => FromEnv (Maybe a) where
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fromEnv = fmap Just . fromEnv
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instance FromEnv Auth.AuthHookType where
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fromEnv = \case
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"GET" -> Right Auth.AHTGet
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"POST" -> Right Auth.AHTPost
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_ -> Left "Only expecting GET / POST"
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instance FromEnv Int where
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fromEnv s =
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case readMaybe s of
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Nothing -> Left "Expecting Int value"
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Just m -> Right m
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instance FromEnv Auth.AdminSecretHash where
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fromEnv = Right . Auth.hashAdminSecret . Text.pack
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instance FromEnv Session.RoleName where
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fromEnv string =
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case Session.mkRoleName (Text.pack string) of
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Nothing -> Left "empty string not allowed"
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Just roleName -> Right roleName
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instance FromEnv Bool where
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fromEnv t
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| map Char.toLower t `elem` truthVals = Right True
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| map Char.toLower t `elem` falseVals = Right False
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| otherwise = Left errMsg
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where
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truthVals = ["true", "t", "yes", "y"]
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falseVals = ["false", "f", "no", "n"]
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errMsg =
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" Not a valid boolean text. True values are "
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++ show truthVals
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++ " and False values are "
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++ show falseVals
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++ ". All values are case insensitive"
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instance FromEnv Config.TelemetryStatus where
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fromEnv = fmap (bool Config.TelemetryDisabled Config.TelemetryEnabled) . fromEnv
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instance FromEnv Config.AdminInternalErrorsStatus where
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fromEnv = fmap (bool Config.AdminInternalErrorsDisabled Config.AdminInternalErrorsEnabled) . fromEnv
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instance FromEnv Config.WsReadCookieStatus where
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fromEnv = fmap (bool Config.WsReadCookieDisabled Config.WsReadCookieEnabled) . fromEnv
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instance FromEnv Aeson.Value where
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fromEnv = Aeson.eitherDecode . BLU.fromString
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instance FromEnv MetadataDefaults where
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fromEnv = Aeson.eitherDecode . BLU.fromString
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instance FromEnv Metadata where
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fromEnv = Aeson.eitherDecode . BLU.fromString
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instance FromEnv Options.StringifyNumbers where
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fromEnv = fmap (bool Options.Don'tStringifyNumbers Options.StringifyNumbers) . fromEnv @Bool
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instance FromEnv Options.RemoteSchemaPermissions where
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fromEnv = fmap (bool Options.DisableRemoteSchemaPermissions Options.EnableRemoteSchemaPermissions) . fromEnv @Bool
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instance FromEnv Options.DangerouslyCollapseBooleans where
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fromEnv = fmap (bool Options.Don'tDangerouslyCollapseBooleans Options.DangerouslyCollapseBooleans) . fromEnv @Bool
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instance FromEnv Options.InferFunctionPermissions where
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fromEnv = fmap (bool Options.Don'tInferFunctionPermissions Options.InferFunctionPermissions) . fromEnv @Bool
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instance FromEnv (Server.Types.MaintenanceMode ()) where
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fromEnv = fmap (bool Server.Types.MaintenanceModeDisabled (Server.Types.MaintenanceModeEnabled ())) . fromEnv @Bool
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instance FromEnv Server.Logging.MetadataQueryLoggingMode where
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fromEnv = fmap (bool Server.Logging.MetadataQueryLoggingDisabled Server.Logging.MetadataQueryLoggingEnabled) . fromEnv @Bool
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instance FromEnv Query.TxIsolation where
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fromEnv = Utils.readIsoLevel
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instance FromEnv Cors.CorsConfig where
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fromEnv = Cors.readCorsDomains
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instance FromEnv (HashSet Config.API) where
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fromEnv = fmap HashSet.fromList . traverse readAPI . Text.splitOn "," . Text.pack
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where
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readAPI si = case Text.toUpper $ Text.strip si of
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"METADATA" -> Right Config.METADATA
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"GRAPHQL" -> Right Config.GRAPHQL
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"PGDUMP" -> Right Config.PGDUMP
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"DEVELOPER" -> Right Config.DEVELOPER
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"CONFIG" -> Right Config.CONFIG
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"METRICS" -> Right Config.METRICS
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_ -> Left "Only expecting list of comma separated API types metadata,graphql,pgdump,developer,config,metrics"
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instance FromEnv NamingCase where
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fromEnv = NamingCase.parseNamingConventionFromText . Text.pack
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instance FromEnv (HashSet Server.Types.ExperimentalFeature) where
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fromEnv = fmap HashSet.fromList . traverse readAPI . Text.splitOn "," . Text.pack
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where
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readAPI si = case Text.toLower $ Text.strip si of
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key | Just (_, ef) <- find ((== key) . fst) experimentalFeatures -> Right ef
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_ ->
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Left $
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"Only expecting list of comma separated experimental features, options are:"
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++ intercalate ", " (map (Text.unpack . fst) experimentalFeatures)
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experimentalFeatures :: [(Text, Server.Types.ExperimentalFeature)]
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experimentalFeatures = [(Server.Types.experimentalFeatureKey ef, ef) | ef <- [minBound .. maxBound]]
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instance FromEnv Subscription.Options.BatchSize where
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fromEnv s = do
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val <- readEither s
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maybeToEither "batch size should be a non negative integer" $ Subscription.Options.mkBatchSize val
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instance FromEnv Subscription.Options.RefetchInterval where
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fromEnv x = do
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val <- fmap (milliseconds . fromInteger) . readEither $ x
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maybeToEither "refetch interval should be a non negative integer" $ Subscription.Options.mkRefetchInterval val
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instance FromEnv Milliseconds where
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fromEnv = readEither
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instance FromEnv Config.OptionalInterval where
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fromEnv x = do
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i <- fromEnv @(Refined NonNegative Milliseconds) x
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if unrefine i == 0
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then pure $ Config.Skip
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else pure $ Config.Interval i
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instance FromEnv Seconds where
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fromEnv = fmap fromInteger . readEither
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instance FromEnv Config.WSConnectionInitTimeout where
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fromEnv s = do
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seconds <- fromIntegral @_ @Seconds <$> fromEnv @Int s
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nonNegative <- maybeToEither "WebSocket Connection Timeout must not be negative" $ refineFail seconds
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pure $ Config.WSConnectionInitTimeout nonNegative
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instance FromEnv Config.KeepAliveDelay where
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fromEnv =
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fmap Config.KeepAliveDelay . fromEnv @(Refined NonNegative Seconds)
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instance FromEnv Auth.JWTConfig where
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fromEnv = readJson
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instance FromEnv [Auth.JWTConfig] where
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fromEnv = readJson
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instance Logging.EnabledLogTypes impl => FromEnv (HashSet (Logging.EngineLogType impl)) where
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fromEnv = fmap HashSet.fromList . Logging.parseEnabledLogTypes
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instance FromEnv Logging.LogLevel where
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fromEnv s = case Text.toLower $ Text.strip $ Text.pack s of
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"debug" -> Right Logging.LevelDebug
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"info" -> Right Logging.LevelInfo
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"warn" -> Right Logging.LevelWarn
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"error" -> Right Logging.LevelError
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_ -> Left "Valid log levels: debug, info, warn or error"
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instance FromEnv Template.URLTemplate where
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fromEnv = Template.parseURLTemplate . Text.pack
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instance (Num a, Ord a, FromEnv a) => FromEnv (Refined NonNegative a) where
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fromEnv s =
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fmap (maybeToEither "Only expecting a non negative numeric") refineFail =<< fromEnv s
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instance FromEnv (Refined Positive Int) where
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fromEnv s =
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maybeToEither "Only expecting a positive integer" (refineFail =<< readMaybe s)
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instance FromEnv Config.Port where
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fromEnv s =
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maybeToEither "Only expecting a value between 0 and 65535" (Config.mkPort =<< readMaybe s)
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instance FromEnv Cache.CacheSize where
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fromEnv = Cache.parseCacheSize
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instance FromEnv ExtensionsSchema where
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fromEnv = Right . MonadTx.ExtensionsSchema . Text.pack
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