diff --git a/CHANGELOG.md b/CHANGELOG.md new file mode 100644 --- /dev/null +++ b/CHANGELOG.md @@ -0,0 +1,12 @@ +# Changelog + +All notable changes to this project will be documented in this file. + +The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), +and this project adheres to the [Haskell Package Versioning Policy](https://pvp.haskell.org/). + +## [1.0.0] - 2026-07-28 + +### Added + +- Initial release. diff --git a/LICENCE b/LICENCE new file mode 100644 --- /dev/null +++ b/LICENCE @@ -0,0 +1,287 @@ + EUROPEAN UNION PUBLIC LICENCE v. 1.2 + EUPL © the European Union 2007, 2016 + +This European Union Public Licence (the ‘EUPL’) applies to the Work (as defined +below) which is provided under the terms of this Licence. 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(State Int :> es) => NamedAPI (AsServer es) +-- > server = +-- > NamedAPI +-- > { helloAPI = HelloAPI{..} +-- > , handleCount = State.get +-- > } +-- > where +-- > hello :: Handler es String +-- > hello = State.modify @Int succ >> pure "Hello!" +-- > +-- > namedHello :: String -> Handler es String +-- > namedHello "teapot" = throwError err418 +-- > namedHello name = do +-- > State.modify @Int succ +-- > pure $ "Hello, " <> name <> "!" +-- +-- Call one of the 'serve' functions to convert the server to a wai 'Application': +-- +-- > app :: (IOE :> es) => Application es +-- > app = serve @API Proxy server +-- +-- Finally, run the 'Application' using +-- @@: +-- +-- > main :: IO () +-- > main = runEff . Warp.run 3000 $ app +module Effectful.Servant + ( -- * Defining APIs + module Effectful.Servant.API + + -- * Implementing servers for APIs + , module Effectful.Servant.Server + + -- * Serving static files + , module Effectful.Servant.Server.StaticFiles + + -- * Useful re-exports + , module Data.Proxy + , module Effectful.Error.Static + ) +where + +import Data.Proxy (Proxy (..)) +import Effectful.Error.Static (throwError) +import Effectful.Servant.API +import Effectful.Servant.Server +import Effectful.Servant.Server.StaticFiles diff --git a/src/Effectful/Servant/API.hs b/src/Effectful/Servant/API.hs new file mode 100644 --- /dev/null +++ b/src/Effectful/Servant/API.hs @@ -0,0 +1,17 @@ +{-# OPTIONS_GHC -Wno-unused-imports #-} + +module Effectful.Servant.API + ( module Effectful.Servant.API + , module Servant.API + ) +where + +import Data.Kind (Type) +import Effectful qualified +import Servant.API hiding ((:>)) +import Servant.API qualified as Servant + +-- | Convenience alias to disambiguate Servant's 'Servant.:>' from Effectful's 'Effectful.:>'. +type (path :: k) :/ (a :: Type) = path Servant.:> a + +infixr 4 :/ diff --git a/src/Effectful/Servant/Server.hs b/src/Effectful/Servant/Server.hs new file mode 100644 --- /dev/null +++ b/src/Effectful/Servant/Server.hs @@ -0,0 +1,146 @@ +module Effectful.Servant.Server + ( -- * Run a wai application from an API + serve + , serveWithContext + , serveWithContextT + , ServerContext + + -- * Handlers for all standard combinators + , HasServer (..) + , Server + , EmptyServer + , emptyServer + , Handler + + -- * Context + , Context (..) + , HasContextEntry (getContextEntry) + , type (.++) + , (.++) + + -- ** NamedContext + , NamedContext (..) + , descendIntoNamedContext + + -- * Basic Authentication + , BasicAuthCheck (BasicAuthCheck, unBasicAuthCheck) + , BasicAuthResult (..) + + -- * Default error type + , ServerError (..) + + -- ** 3XX + , err300 + , err301 + , err302 + , err303 + , err304 + , err305 + , err307 + + -- ** 4XX + , err400 + , err401 + , err402 + , err403 + , err404 + , err405 + , err406 + , err407 + , err409 + , err410 + , err411 + , err412 + , err413 + , err414 + , err415 + , err416 + , err417 + , err418 + , err422 + , err429 + + -- ** 5XX + , err500 + , err501 + , err502 + , err503 + , err504 + , err505 + ) +where + +import Control.Monad.Trans.Except (ExceptT (ExceptT)) +import Data.Kind (Type) +import Data.Proxy (Proxy) +import Effectful +import Effectful.Error.Static (Error, runErrorNoCallStack) +import Effectful.Wai (Application, liftApplication) +import Servant.Server hiding + ( Application + , Handler + , Server + , respond + , serve + , serveWithContext + , serveWithContextT + ) +import Servant.Server qualified as Servant +import Prelude + +-- | Lifted 'Servant.Handler'. +type Handler (es :: [Effect]) = Eff (Error ServerError ': es) + +-- | Lifted 'Servant.Server'. +type Server (api :: Type) (es :: [Effect]) = ServerT api (Handler es) + +-- | Lifted 'Servant.serve'. +serve + :: ( HasServer api ('[] :: [Type]) + , IOE :> es + ) + => Proxy api + -> Server api es + -> Application es +serve p = serveWithContext p EmptyContext + +-- | Lifted 'Servant.serveWithContext'. +serveWithContext + :: ( HasServer api context + , ServerContext context + , IOE :> es + ) + => Proxy api + -> Context context + -> Server api es + -> Application es +serveWithContext p context = serveWithContextT p context id + +-- | Lifted 'Servant.serveWithContextT'. +serveWithContextT + :: ( HasServer api context + , ServerContext context + , IOE :> es + ) + => Proxy api + -> Context context + -> (forall a. m a -> Handler es a) + -> ServerT api m + -> Application es +serveWithContextT p context toHandler server req respond = + withEffToIO SeqUnlift \unlift -> + unlift $ + liftApplication + ( Servant.serveWithContextT + p + context + ( Servant.Handler + . ExceptT + . unlift + . runErrorNoCallStack + . toHandler + ) + server + ) + req + respond diff --git a/src/Effectful/Servant/Server/Generic.hs b/src/Effectful/Servant/Server/Generic.hs new file mode 100644 --- /dev/null +++ b/src/Effectful/Servant/Server/Generic.hs @@ -0,0 +1,80 @@ +module Effectful.Servant.Server.Generic + ( module Effectful.Servant.Server.Generic + , module Servant.Server.Generic + ) +where + +import Data.Kind (Type) +import Data.Proxy (Proxy (..)) +import Effectful +import Effectful.Servant.API +import Effectful.Servant.Server +import Effectful.Wai (Application) +import Servant + ( DefaultErrorFormatters + , ErrorFormatters + , hoistServer + ) +import Servant.Server.Generic (AsServerT, genericServerT) +import Servant.Server.Generic qualified as Servant +import Prelude + +type AsServer (es :: [Effect]) = AsServerT (Handler es) + +-- | Lifted 'Servant.genericServe'. +genericServe + :: forall (routes :: Type -> Type) (es :: [Effect]) + . ( HasServer (ToServantApi routes) '[] + , GenericServant routes (AsServer es) + , Server (ToServantApi routes) es ~ ToServant routes (AsServer es) + , IOE :> es + ) + => routes (AsServer es) -> Application es +genericServe = serve @(ToServantApi routes) Proxy . genericServer + +-- | Lifted 'Servant.genericServeT'. +genericServeT + :: forall (routes :: Type -> Type) (m :: Type -> Type) (es :: [Effect]) + . ( GenericServant routes (AsServerT m) + , HasServer (ToServantApi routes) '[] + , ServerT (ToServantApi routes) m ~ ToServant routes (AsServerT m) + , IOE :> es + ) + => (forall a. m a -> Handler es a) + -- ^ 'hoistServer' argument to come back to 'Handler' + -> routes (AsServerT m) + -- ^ your record full of request handlers + -> Application es +genericServeT f server = serve p $ hoistServer p f (Servant.genericServerT server) + where + p = Proxy @(ToServantApi routes) + +-- | Lifted 'Servant.genericServeTWithContext'. +genericServeTWithContext + :: forall (routes :: Type -> Type) (m :: Type -> Type) (ctx :: [Type]) (es :: [Effect]) + . ( GenericServant routes (AsServerT m) + , HasServer (ToServantApi routes) ctx + , HasContextEntry (ctx .++ DefaultErrorFormatters) ErrorFormatters + , ServerT (ToServantApi routes) m ~ ToServant routes (AsServerT m) + , IOE :> es + ) + => (forall a. m a -> Handler es a) + -- ^ 'hoistServer' argument to come back to 'Handler' + -> routes (AsServerT m) + -- ^ your record full of request handlers + -> Context ctx + -- ^ the 'Context' to serve the application with + -> Application es +genericServeTWithContext f server ctx = + serveWithContext p ctx $ + hoistServerWithContext p pctx f (Servant.genericServerT server) + where + p = Proxy @(ToServantApi routes) + pctx = Proxy @ctx + +-- | Lifted 'Servant.genericServer'. +genericServer + :: (GenericServant routes (AsServer es)) + => routes (AsServer es) + -> ToServant routes (AsServer es) +genericServer = toServant diff --git a/src/Effectful/Servant/Server/StaticFiles.hs b/src/Effectful/Servant/Server/StaticFiles.hs new file mode 100644 --- /dev/null +++ b/src/Effectful/Servant/Server/StaticFiles.hs @@ -0,0 +1,28 @@ +{-# OPTIONS_GHC -Wno-redundant-constraints #-} + +module Effectful.Servant.Server.StaticFiles + ( serveDirectoryWebApp + , serveDirectoryFileServer + , serveDirectoryEmbedded + ) +where + +import Data.ByteString (ByteString) +import Effectful ((:>)) +import Effectful.FileSystem (FileSystem) +import Effectful.Servant.API (Raw) +import Effectful.Servant.Server (Server) +import Servant.Server.StaticFiles qualified as Servant +import Prelude + +-- | Lifted 'Servant.serveDirectoryWebApp'. +serveDirectoryWebApp :: (FileSystem :> es) => FilePath -> Server Raw es +serveDirectoryWebApp = Servant.serveDirectoryWebApp + +-- | Lifted 'Servant.serveDirectoryFileServer'. +serveDirectoryFileServer :: (FileSystem :> es) => FilePath -> Server Raw es +serveDirectoryFileServer = Servant.serveDirectoryFileServer + +-- | Lifted 'Servant.serveDirectoryEmbedded'. +serveDirectoryEmbedded :: [(FilePath, ByteString)] -> Server Raw es +serveDirectoryEmbedded = Servant.serveDirectoryEmbedded diff --git a/test/Main.hs b/test/Main.hs new file mode 100644 --- /dev/null +++ b/test/Main.hs @@ -0,0 +1,54 @@ +module Main where + +import Data.ByteString.Lazy (LazyByteString) +import Data.Kind (Type) +import Effectful +import Effectful.Hspec +import Effectful.HttpClient hiding (Proxy) +import Effectful.Servant +import Effectful.Servant.Server.Generic (AsServer) +import Effectful.Wai (Application) +import Effectful.Wai.Handler.Warp (Port, withApplication) +import GHC.Generics (Generic) +import Network.HTTP.Types qualified as HTTP +import Prelude + +type API = NamedRoutes NamedAPI + +data NamedAPI (mode :: Type) = NamedAPI + { hello :: mode :- Get '[PlainText] String + , helloNamed :: mode :- Capture "name" String :/ Get '[PlainText] String + } + deriving stock (Generic) + +server :: NamedAPI (AsServer es) +server = NamedAPI{..} + where + hello :: Handler es String + hello = pure "Hello!" + + helloNamed :: String -> Handler es String + helloNamed "teapot" = throwError err418 + helloNamed name = pure $ "Hello, " <> name <> "!" + +app :: (IOE :> es) => Application es +app = serve @API Proxy server + +get :: (HttpClient :> es) => String -> Port -> Eff es (Response LazyByteString) +get path port = do + req <- parseRequest $ "http://127.0.0.1:" <> show port <> path + httpLbs req{requestHeaders = [("Connection", "close")]} + +main :: IO () +main = runEff . runHttpClient . runHspec . describe "Servant" $ do + it "says hello" do + resp <- withApplication (pure app) (get "/") + responseBody resp `shouldBe` "Hello!" + + it "says hello to Ueli" do + resp <- withApplication (pure app) (get "/Ueli") + responseBody resp `shouldBe` "Hello, Ueli!" + + it "is a teapot" do + resp <- withApplication (pure app) (get "/teapot") + responseStatus resp `shouldBe` HTTP.status418