103 lines
3.8 KiB
Haskell
103 lines
3.8 KiB
Haskell
module Main where
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import PostgREST.App
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import PostgREST.Config (AppConfig (..),
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minimumPgVersion,
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prettyVersion,
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readOptions)
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import PostgREST.Error (errResponse, PgError)
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import PostgREST.Middleware
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import PostgREST.PgStructure
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import PostgREST.Types
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import Control.Monad (unless)
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import Control.Monad.IO.Class (liftIO)
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import Data.Aeson.Encode.Pretty (encodePretty)
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import Data.Functor.Identity
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import Data.Monoid ((<>))
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import Data.String.Conversions (cs)
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import Data.Text (Text)
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import qualified Hasql as H
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import qualified Hasql.Postgres as P
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import Network.Wai
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import Network.Wai.Handler.Warp hiding (Connection)
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import Network.Wai.Middleware.RequestLogger (logStdout)
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import System.IO (BufferMode (..),
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hSetBuffering, stderr,
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stdin, stdout)
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isServerVersionSupported :: H.Session P.Postgres IO Bool
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isServerVersionSupported = do
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Identity (row :: Text) <- H.tx Nothing $ H.singleEx [H.stmt|SHOW server_version_num|]
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return $ read (cs row) >= minimumPgVersion
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hasqlError :: PgError -> IO a
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hasqlError = error . cs . encodePretty
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main :: IO ()
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main = do
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hSetBuffering stdout LineBuffering
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hSetBuffering stdin LineBuffering
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hSetBuffering stderr NoBuffering
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conf <- readOptions
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let port = configPort conf
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unless (configSecure conf) $
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putStrLn "WARNING, running in insecure mode, auth will be in plaintext"
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unless ("secret" /= configJwtSecret conf) $
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putStrLn "WARNING, running in insecure mode, JWT secret is the default value"
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Prelude.putStrLn $ "Listening on port " ++
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(show $ configPort conf :: String)
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let pgSettings = P.StringSettings $ cs (configDatabase conf)
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appSettings = setPort port
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. setServerName (cs $ "postgrest/" <> prettyVersion)
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$ defaultSettings
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middle = logStdout . defaultMiddle (configSecure conf)
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poolSettings <- maybe (fail "Improper session settings") return $
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H.poolSettings (fromIntegral $ configPool conf) 30
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pool :: H.Pool P.Postgres <- H.acquirePool pgSettings poolSettings
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supportedOrError <- H.session pool isServerVersionSupported
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either hasqlError
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(\supported ->
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unless supported $
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error (
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"Cannot run in this PostgreSQL version, PostgREST needs at least "
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<> show minimumPgVersion)
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) supportedOrError
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roleOrError <- H.session pool $ do
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Identity (role :: Text) <- H.tx Nothing $ H.singleEx
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[H.stmt|SELECT SESSION_USER|]
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return role
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authenticator <- either hasqlError return roleOrError
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let txSettings = Just (H.ReadCommitted, Just True)
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metadata <- H.session pool $ H.tx txSettings $ do
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tabs <- allTables
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rels <- allRelations
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cols <- allColumns rels
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keys <- allPrimaryKeys
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return (tabs, rels, cols, keys)
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dbstructure <- either hasqlError
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(\(tabs, rels, cols, keys) ->
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return DbStructure {
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tables=tabs
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, columns=cols
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, relations=rels
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, primaryKeys=keys
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}
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) metadata
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runSettings appSettings $ middle $ \ req respond -> do
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body <- strictRequestBody req
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resOrError <- liftIO $ H.session pool $ H.tx txSettings $
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authenticated conf authenticator (app dbstructure conf authenticator body) req
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either (respond . errResponse) respond resOrError
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