@@ -1,12 +1,10 @@
1{-# LANGUAGE AllowAmbiguousTypes #-}
1{-# LANGUAGE AllowAmbiguousTypes #-}
2{-# LANGUAGE ConstraintKinds #-}
2{-# LANGUAGE ConstraintKinds #-}
4{-# LANGUAGE DataKinds #-}
3{-# LANGUAGE DataKinds #-}
5{-# LANGUAGE DeriveDataTypeable #-}
4{-# LANGUAGE DeriveDataTypeable #-}
6{-# LANGUAGE FlexibleContexts #-}
5{-# LANGUAGE FlexibleContexts #-}
7{-# LANGUAGE FlexibleInstances #-}
6{-# LANGUAGE FlexibleInstances #-}
8{-# LANGUAGE InstanceSigs #-}
7{-# LANGUAGE InstanceSigs #-}
9−{-# LANGUAGE LambdaCase #-}
10{-# LANGUAGE MultiParamTypeClasses #-}
8{-# LANGUAGE MultiParamTypeClasses #-}
11{-# LANGUAGE OverloadedStrings #-}
9{-# LANGUAGE OverloadedStrings #-}
12{-# LANGUAGE PolyKinds #-}
10{-# LANGUAGE PolyKinds #-}
@@ -36,15 +34,14 @@ module Servant.Server.Internal
36import Control.Monad
34import Control.Monad
37 (join, when)
35 (join, when)
38import Control.Monad.Trans
36import Control.Monad.Trans
39− (liftIO, lift)
37+ (liftIO)
40import Control.Monad.Trans.Resource
38import Control.Monad.Trans.Resource
41− (runResourceT, ReleaseKey)
39+ (runResourceT)
43import qualified Data.ByteString as B
40import qualified Data.ByteString as B
44import qualified Data.ByteString.Builder as BB
41import qualified Data.ByteString.Builder as BB
45import qualified Data.ByteString.Char8 as BC8
42import qualified Data.ByteString.Char8 as BC8
46import qualified Data.ByteString.Lazy as BL
43import qualified Data.ByteString.Lazy as BL
47−import Data.Constraint (Constraint, Dict(..))
44+import Data.Constraint (Dict(..))
48import Data.Either
45import Data.Either
49 (partitionEithers)
46 (partitionEithers)
50import Data.Maybe
47import Data.Maybe
@@ -59,14 +56,14 @@ import qualified Data.Text as T
59import Data.Typeable
56import Data.Typeable
60import GHC.Generics
57import GHC.Generics
61import GHC.TypeLits
58import GHC.TypeLits
62− (KnownNat, KnownSymbol, TypeError, symbolVal)
59+ (KnownNat, KnownSymbol, symbolVal)
63import qualified Network.HTTP.Media as NHM
60import qualified Network.HTTP.Media as NHM
64import Network.HTTP.Types hiding
61import Network.HTTP.Types hiding
65 (Header, ResponseHeaders)
62 (Header, ResponseHeaders)
66import Network.Socket
63import Network.Socket
67 (SockAddr)
64 (SockAddr)
68import Network.Wai
65import Network.Wai
69− (Application, Request, Response, ResponseReceived, httpVersion, isSecure, lazyRequestBody,
66+ (Application, Request, httpVersion, isSecure, lazyRequestBody,
70 queryString, remoteHost, getRequestBodyChunk, requestHeaders,
67 queryString, remoteHost, getRequestBodyChunk, requestHeaders,
71 requestMethod, responseLBS, responseStream, vault)
68 requestMethod, responseLBS, responseStream, vault)
72import Prelude ()
69import Prelude ()
@@ -76,10 +73,10 @@ import Servant.API
76 CaptureAll, Description, EmptyAPI, Fragment,
73 CaptureAll, Description, EmptyAPI, Fragment,
77 FramingRender (..), FramingUnrender (..), FromSourceIO (..),
74 FramingRender (..), FramingUnrender (..), FromSourceIO (..),
78 Header', If, IsSecure (..), NoContentVerb, QueryFlag,
75 Header', If, IsSecure (..), NoContentVerb, QueryFlag,
79− QueryParam', QueryParams, Raw, RawM, ReflectMethod (reflectMethod),
76+ QueryParam', QueryParams, Raw, ReflectMethod (reflectMethod),
80 RemoteHost, ReqBody', SBool (..), SBoolI (..), SourceIO,
77 RemoteHost, ReqBody', SBool (..), SBoolI (..), SourceIO,
81 Stream, StreamBody', Summary, ToSourceIO (..), Vault, Verb,
78 Stream, StreamBody', Summary, ToSourceIO (..), Vault, Verb,
82− WithNamedContext, WithResource, NamedRoutes)
79+ WithNamedContext, NamedRoutes)
83import Servant.API.Generic (GenericMode(..), ToServant, ToServantApi, GServantProduct, toServant, fromServant)
80import Servant.API.Generic (GenericMode(..), ToServant, ToServantApi, GServantProduct, toServant, fromServant)
84import Servant.API.ContentTypes
81import Servant.API.ContentTypes
85 (AcceptHeader (..), AllCTRender (..), AllCTUnrender (..),
82 (AcceptHeader (..), AllCTRender (..), AllCTUnrender (..),
@@ -93,12 +90,9 @@ import Servant.API.ResponseHeaders
93import Servant.API.Status
90import Servant.API.Status
94 (statusFromNat)
91 (statusFromNat)
95import qualified Servant.Types.SourceT as S
92import qualified Servant.Types.SourceT as S
96−import Servant.API.TypeErrors
97import Web.HttpApiData
93import Web.HttpApiData
98 (FromHttpApiData, parseHeader, parseQueryParam, parseUrlPiece,
94 (FromHttpApiData, parseHeader, parseQueryParam, parseUrlPiece,
99 parseUrlPieces)
95 parseUrlPieces)
103import Servant.Server.Internal.BasicAuth
97import Servant.Server.Internal.BasicAuth
104import Servant.Server.Internal.Context
98import Servant.Server.Internal.Context
@@ -117,10 +111,6 @@ import Servant.API.TypeLevel
117 (AtLeastOneFragment, FragmentUnique)
111 (AtLeastOneFragment, FragmentUnique)
119class HasServer api context where
113class HasServer api context where
120− -- | The type of a server for this API, given a monad to run effects in.
122− -- Note that the result kind is @*@, so it is /not/ a monad transformer, unlike
123− -- what the @T@ in the name might suggest.
124 type ServerT api (m :: * -> *) :: *
114 type ServerT api (m :: * -> *) :: *
@@ -182,7 +172,7 @@ instance (HasServer a context, HasServer b context) => HasServer (a :<|> b) cont
182-- > server = getBook
172-- > server = getBook
183-- > where getBook :: Text -> Handler Book
173-- > where getBook :: Text -> Handler Book
184-- > getBook isbn = ...
174-- > getBook isbn = ...
185−instance (KnownSymbol capture, FromHttpApiData a, Typeable a
175+instance (KnownSymbol capture, FromHttpApiData a
186 , HasServer api context, SBoolI (FoldLenient mods)
176 , HasServer api context, SBoolI (FoldLenient mods)
187 , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters
177 , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters
@@ -194,7 +184,7 @@ instance (KnownSymbol capture, FromHttpApiData a, Typeable a
194 hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy :: Proxy api) pc nt . s
184 hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy :: Proxy api) pc nt . s
196 route Proxy context d =
186 route Proxy context d =
197− CaptureRouter [hint] $
187+ CaptureRouter $
198 route (Proxy :: Proxy api)
188 route (Proxy :: Proxy api)
200 (addCapture d $ \ txt -> withRequest $ \ request ->
190 (addCapture d $ \ txt -> withRequest $ \ request ->
@@ -206,7 +196,6 @@ instance (KnownSymbol capture, FromHttpApiData a, Typeable a
207 rep = typeRep (Proxy :: Proxy Capture')
197 rep = typeRep (Proxy :: Proxy Capture')
208 formatError = urlParseErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
198 formatError = urlParseErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
209− hint = CaptureHint (T.pack $ symbolVal $ Proxy @capture) (typeRep (Proxy :: Proxy a))
211-- | If you use 'CaptureAll' in one of the endpoints for your API,
200-- | If you use 'CaptureAll' in one of the endpoints for your API,
212-- this automatically requires your server-side handler to be a
201-- this automatically requires your server-side handler to be a
@@ -225,7 +214,7 @@ instance (KnownSymbol capture, FromHttpApiData a, Typeable a
225-- > server = getSourceFile
214-- > server = getSourceFile
226-- > where getSourceFile :: [Text] -> Handler Book
215-- > where getSourceFile :: [Text] -> Handler Book
227-- > getSourceFile pathSegments = ...
216-- > getSourceFile pathSegments = ...
228−instance (KnownSymbol capture, FromHttpApiData a, Typeable a
217+instance (KnownSymbol capture, FromHttpApiData a
229 , HasServer api context
218 , HasServer api context
230 , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters
219 , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters
@@ -237,7 +226,7 @@ instance (KnownSymbol capture, FromHttpApiData a, Typeable a
237 hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy :: Proxy api) pc nt . s
226 hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy :: Proxy api) pc nt . s
239 route Proxy context d =
228 route Proxy context d =
240− CaptureAllRouter [hint] $
229+ CaptureAllRouter $
241 route (Proxy :: Proxy api)
230 route (Proxy :: Proxy api)
243 (addCapture d $ \ txts -> withRequest $ \ request ->
232 (addCapture d $ \ txts -> withRequest $ \ request ->
@@ -248,43 +237,6 @@ instance (KnownSymbol capture, FromHttpApiData a, Typeable a
249 rep = typeRep (Proxy :: Proxy CaptureAll)
238 rep = typeRep (Proxy :: Proxy CaptureAll)
250 formatError = urlParseErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
239 formatError = urlParseErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
251− hint = CaptureHint (T.pack $ symbolVal $ Proxy @capture) (typeRep (Proxy :: Proxy [a]))
253−-- | If you use 'WithResource' in one of the endpoints for your API Servant
254−-- will provide the handler for this endpoint an argument of the specified type.
255−-- The lifespan of this resource will be automatically managed by Servant. This
256−-- resource will be created before the handler starts and it will be destoyed
257−-- after it ends. A new resource is created for each request to the endpoint.
259−-- The creation and destruction are done using a 'Data.Acquire.Acquire'
260−-- provided via server 'Context'.
264−-- > type MyApi = WithResource Handle :> "writeToFile" :> Post '[JSON] NoContent
266−-- > server :: Server MyApi
267−-- > server = writeToFile
268−-- > where writeToFile :: (ReleaseKey, Handle) -> Handler NoContent
269−-- > writeToFile (_, h) = hPutStrLn h "message"
271−-- In addition to the resource, the handler will also receive a 'ReleaseKey'
272−-- which can be used to deallocate the resource before the end of the request
275−instance (HasServer api ctx, HasContextEntry ctx (Acquire a))
276− => HasServer (WithResource a :> api) ctx where
278− type ServerT (WithResource a :> api) m = (ReleaseKey, a) -> ServerT api m
280− hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy @api) pc nt . s
282− route Proxy context d = route (Proxy @api) context (d `addParameterCheck` allocateResource)
284− allocateResource :: DelayedIO (ReleaseKey, a)
285− allocateResource = DelayedIO $ lift $ allocateAcquire (getContextEntry context)
289allowedMethodHead :: Method -> Request -> Bool
241allowedMethodHead :: Method -> Request -> Bool
290allowedMethodHead method request = method == methodGet && requestMethod request == methodHead
242allowedMethodHead method request = method == methodGet && requestMethod request == methodHead
@@ -653,35 +605,6 @@ instance HasServer Raw context where
653 Fail a -> respond $ Fail a
605 Fail a -> respond $ Fail a
654 FailFatal e -> respond $ FailFatal e
606 FailFatal e -> respond $ FailFatal e
656−-- | Just pass the request to the underlying application and serve its response.
660−-- > type MyApi = "images" :> Raw
662−-- > server :: Server MyApi
663−-- > server = serveDirectory "/var/www/images"
664−instance HasServer RawM context where
665− type ServerT RawM m = Request -> (Response -> IO ResponseReceived) -> m ResponseReceived
670− -> Delayed env (Request -> (Response -> IO ResponseReceived) -> Handler ResponseReceived) -> Router env
671− route _ _ handleDelayed = RawRouter $ \env request respond -> runResourceT $ do
672− routeResult <- runDelayed handleDelayed env request
673− let respond' = liftIO . respond
674− liftIO $ case routeResult of
675− Route handler -> runHandler (handler request (respond . Route)) >>=
677− Left e -> respond' $ FailFatal e
679− Fail e -> respond' $ Fail e
680− FailFatal e -> respond' $ FailFatal e
682− hoistServerWithContext _ _ f srvM = \req respond -> f (srvM req respond)
685-- | If you use 'ReqBody' in one of the endpoints for your API,
608-- | If you use 'ReqBody' in one of the endpoints for your API,
686-- this automatically requires your server-side handler to be a function
609-- this automatically requires your server-side handler to be a function
687-- that takes an argument of the type specified by 'ReqBody'.
610-- that takes an argument of the type specified by 'ReqBody'.
@@ -891,19 +814,38 @@ instance (HasContextEntry context (NamedContext name subContext), HasServer subA
891 hoistServerWithContext _ _ nt s = hoistServerWithContext (Proxy :: Proxy subApi) (Proxy :: Proxy subContext) nt s
814 hoistServerWithContext _ _ nt s = hoistServerWithContext (Proxy :: Proxy subApi) (Proxy :: Proxy subContext) nt s
893-------------------------------------------------------------------------------
816-------------------------------------------------------------------------------
894−-- Custom type errors
817+-- TypeError helpers
895-------------------------------------------------------------------------------
818-------------------------------------------------------------------------------
897−-- Erroring instance for 'HasServer' when a combinator is not fully applied
820+-- | This instance catches mistakes when there are non-saturated
898−instance TypeError (PartialApplication
821+-- type applications on LHS of ':>'.
899−#if __GLASGOW_HASKELL__ >= 904
822+--
900− @(Type -> [Type] -> Constraint)
823+-- >>> serve (Proxy :: Proxy (Capture "foo" :> Get '[JSON] Int)) (error "...")
825+-- ...Expected something of kind Symbol or *, got: k -> l on the LHS of ':>'.
826+-- ...Maybe you haven't applied enough arguments to
827+-- ...Capture' '[] "foo"
830+-- >>> undefined :: Server (Capture "foo" :> Get '[JSON] Int)
832+-- ...Expected something of kind Symbol or *, got: k -> l on the LHS of ':>'.
833+-- ...Maybe you haven't applied enough arguments to
834+-- ...Capture' '[] "foo"
902− HasServer arr) => HasServer ((arr :: a -> b) :> sub) context
837+instance TypeError (HasServerArrowKindError arr) => HasServer ((arr :: k -> l) :> api) context
904− type ServerT (arr :> sub) _ = TypeError (PartialApplication (HasServer :: * -> [*] -> Constraint) arr)
839+ type ServerT (arr :> api) m = TypeError (HasServerArrowKindError arr)
905− route = error "unreachable"
840+ -- it doesn't really matter what sub route we peak
841+ route _ _ _ = error "servant-server panic: impossible happened in HasServer (arr :> api)"
906− hoistServerWithContext _ _ _ _ = error "unreachable"
842+ hoistServerWithContext _ _ _ = id
844+-- Cannot have TypeError here, otherwise use of this symbol will error :)
845+type HasServerArrowKindError arr =
846+ 'Text "Expected something of kind Symbol or *, got: k -> l on the LHS of ':>'."
847+ ':$$: 'Text "Maybe you haven't applied enough arguments to"
908-- | This instance prevents from accidentally using '->' instead of ':>'
850-- | This instance prevents from accidentally using '->' instead of ':>'
@@ -938,19 +880,6 @@ type HasServerArrowTypeError a b =
938 ':$$: 'Text "and"
880 ':$$: 'Text "and"
939 ':$$: 'ShowType b
881 ':$$: 'ShowType b
941−-- Erroring instances for 'HasServer' for unknown API combinators
943−-- XXX: This omits the @context@ parameter, e.g.:
945−-- "There is no instance for HasServer (Bool :> …)". Do we care ?
946−instance {-# OVERLAPPABLE #-} TypeError (NoInstanceForSub
947−#if __GLASGOW_HASKELL__ >= 904
948− @(Type -> [Type] -> Constraint)
950− HasServer ty) => HasServer (ty :> sub) context
952−instance {-# OVERLAPPABLE #-} TypeError (NoInstanceFor (HasServer api context)) => HasServer api context
954-- | Ignore @'Fragment'@ in server handlers.
883-- | Ignore @'Fragment'@ in server handlers.
955-- See <https://ietf.org/rfc/rfc2616.html#section-15.1.3> for more details.
884-- See <https://ietf.org/rfc/rfc2616.html#section-15.1.3> for more details.