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134
servant-client-core/src/Servant/Client/Core/ResponseUnrender.hs
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| {-# LANGUAGE ApplicativeDo #-} | ||
| module Servant.Client.Core.ResponseUnrender where | ||
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| import Control.Applicative | ||
| import Control.Monad | ||
| import Data.Kind (Type) | ||
| import Data.SOP | ||
| import Data.Typeable | ||
| import GHC.TypeLits | ||
| import Network.HTTP.Types.Status (Status) | ||
| import qualified Data.ByteString.Lazy as BSL | ||
| import qualified Network.HTTP.Media as M | ||
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| import Servant.API.ContentTypes | ||
| import Servant.API.MultiVerb | ||
| import Servant.API.Status | ||
| import Servant.API.UVerb.Union (Union) | ||
| import Servant.Client.Core.Response (ResponseF(..)) | ||
| import qualified Servant.Client.Core.Response as Response | ||
| import Servant.API.Stream (SourceIO) | ||
| import Data.ByteString (ByteString) | ||
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| data SomeClientResponse = forall a. Typeable a => SomeClientResponse (ResponseF a) | ||
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| fromSomeClientResponse | ||
| :: forall a m. (Alternative m, Typeable a) | ||
| => SomeClientResponse | ||
| -> m (ResponseF a) | ||
| fromSomeClientResponse (SomeClientResponse Response {..}) = do | ||
| body <- maybe empty pure $ cast @_ @a responseBody | ||
| pure $ | ||
| Response | ||
| { responseBody = body, | ||
| .. | ||
| } | ||
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| class ResponseUnrender cs a where | ||
| type ResponseBody a :: Type | ||
| type ResponseStatus a :: Nat | ||
| responseUnrender | ||
| :: M.MediaType | ||
| -> ResponseF (ResponseBody a) | ||
| -> UnrenderResult (ResponseType a) | ||
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| -- | ||
| -- FIXME: Move this to the client in its own module | ||
| class (Typeable as) => ResponseListUnrender cs as where | ||
| responseListUnrender | ||
| :: M.MediaType | ||
| -> SomeClientResponse | ||
| -> UnrenderResult (Union (ResponseTypes as)) | ||
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| responseListStatuses :: [Status] | ||
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| instance ResponseListUnrender cs '[] where | ||
| responseListUnrender _ _ = StatusMismatch | ||
| responseListStatuses = [] | ||
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| instance | ||
| ( Typeable a, | ||
| Typeable (ResponseBody a), | ||
| ResponseUnrender cs a, | ||
| ResponseListUnrender cs as, | ||
| KnownStatus (ResponseStatus a) | ||
| ) => | ||
| ResponseListUnrender cs (a ': as) | ||
| where | ||
| responseListUnrender c output = | ||
| Z . I <$> (responseUnrender @cs @a c =<< fromSomeClientResponse output) | ||
| <|> S <$> responseListUnrender @cs @as c output | ||
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| responseListStatuses = statusVal (Proxy @(ResponseStatus a)) : responseListStatuses @cs @as | ||
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| instance | ||
| ( KnownStatus s, | ||
| MimeUnrender ct a | ||
| ) => | ||
| ResponseUnrender cs (RespondAs (ct :: Type) s desc a) | ||
| where | ||
| type ResponseStatus (RespondAs ct s desc a) = s | ||
| type ResponseBody (RespondAs ct s desc a) = BSL.ByteString | ||
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| responseUnrender _ output = do | ||
| guard (responseStatusCode output == statusVal (Proxy @s)) | ||
| either UnrenderError UnrenderSuccess $ | ||
| mimeUnrender (Proxy @ct) (Response.responseBody output) | ||
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| instance (KnownStatus s) => ResponseUnrender cs (RespondAs '() s desc ()) where | ||
| type ResponseStatus (RespondAs '() s desc ()) = s | ||
| type ResponseBody (RespondAs '() s desc ()) = () | ||
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| responseUnrender _ output = | ||
| guard (responseStatusCode output == statusVal (Proxy @s)) | ||
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| instance | ||
| (KnownStatus s) | ||
| => ResponseUnrender cs (RespondStreaming s desc framing ct) | ||
| where | ||
| type ResponseStatus (RespondStreaming s desc framing ct) = s | ||
| type ResponseBody (RespondStreaming s desc framing ct) = SourceIO ByteString | ||
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| responseUnrender _ resp = do | ||
| guard (Response.responseStatusCode resp == statusVal (Proxy @s)) | ||
| pure $ Response.responseBody resp | ||
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| instance | ||
| (AllMimeUnrender cs a, KnownStatus s) | ||
| => ResponseUnrender cs (Respond s desc a) where | ||
| type ResponseStatus (Respond s desc a) = s | ||
| type ResponseBody (Respond s desc a) = BSL.ByteString | ||
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| responseUnrender c output = do | ||
| guard (responseStatusCode output == statusVal (Proxy @s)) | ||
| let results = allMimeUnrender (Proxy @cs) | ||
| case lookup c results of | ||
| Nothing -> empty | ||
| Just f -> either UnrenderError UnrenderSuccess (f (responseBody output)) | ||
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| instance | ||
| ( AsHeaders xs (ResponseType r) a, | ||
| ServantHeaders hs xs, | ||
| ResponseUnrender cs r | ||
| ) => | ||
| ResponseUnrender cs (WithHeaders hs a r) | ||
| where | ||
| type ResponseStatus (WithHeaders hs a r) = ResponseStatus r | ||
| type ResponseBody (WithHeaders hs a r) = ResponseBody r | ||
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| responseUnrender c output = do | ||
| x <- responseUnrender @cs @r c output | ||
| case extractHeaders @hs (responseHeaders output) of | ||
| Nothing -> UnrenderError "Failed to parse headers" | ||
| Just hs -> pure $ fromHeaders @xs (hs, x) |
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