145 lines
4.8 KiB
Haskell
145 lines
4.8 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE ConstraintKinds #-}
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE FunctionalDependencies #-}
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{-# LANGUAGE GADTs #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE PolyKinds #-}
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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE StandaloneDeriving #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE TypeOperators #-}
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{-# LANGUAGE UndecidableInstances #-}
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#if __GLASGOW_HASKELL__ >= 800
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{-# OPTIONS_GHC -freduction-depth=100 #-}
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#else
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{-# OPTIONS_GHC -fcontext-stack=100 #-}
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#endif
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{-# OPTIONS_GHC -fno-warn-orphans #-}
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{-# OPTIONS_GHC -fno-warn-name-shadowing #-}
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#include "overlapping-compat.h"
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module Servant.StreamSpec (spec) where
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import Control.Monad (replicateM_, void)
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import qualified Data.ByteString as BS
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import Data.Proxy
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import qualified Network.HTTP.Client as C
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import Prelude ()
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import Prelude.Compat
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import System.IO (IOMode (ReadMode), withFile)
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import System.IO.Unsafe (unsafePerformIO)
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import Test.Hspec
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import Test.QuickCheck
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import Servant.API ((:<|>) ((:<|>)), (:>), JSON,
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NetstringFraming, NewlineFraming,
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OctetStream, ResultStream (..),
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StreamGenerator (..), StreamGet,
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NoFraming)
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import Servant.Client
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import Servant.ClientSpec (Person (..))
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import qualified Servant.ClientSpec as CS
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import Servant.Server
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#if MIN_VERSION_base(4,10,0)
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import GHC.Stats (gcdetails_mem_in_use_bytes, gc, getRTSStats)
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#else
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import GHC.Stats (currentBytesUsed, getGCStats)
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#endif
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spec :: Spec
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spec = describe "Servant.Stream" $ do
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streamSpec
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type StreamApi f =
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"streamGetNewline" :> StreamGet NewlineFraming JSON (f Person)
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:<|> "streamGetNetstring" :> StreamGet NetstringFraming JSON (f Person)
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:<|> "streamALot" :> StreamGet NoFraming OctetStream (f BS.ByteString)
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capi :: Proxy (StreamApi ResultStream)
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capi = Proxy
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sapi :: Proxy (StreamApi StreamGenerator)
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sapi = Proxy
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getGetNL, getGetNS :: ClientM (ResultStream Person)
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getGetALot :: ClientM (ResultStream BS.ByteString)
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getGetNL :<|> getGetNS :<|> getGetALot = client capi
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alice :: Person
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alice = Person "Alice" 42
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bob :: Person
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bob = Person "Bob" 25
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server :: Application
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server = serve sapi
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$ return (StreamGenerator (\f r -> f alice >> r bob >> r alice))
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:<|> return (StreamGenerator (\f r -> f alice >> r bob >> r alice))
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:<|> return (StreamGenerator lotsGenerator)
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where
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lotsGenerator f r = do
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void $ f ""
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void $ withFile "/dev/urandom" ReadMode $
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\handle -> streamFiveMBNTimes handle 1000 r
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return ()
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streamFiveMBNTimes handle left sink
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| left <= (0 :: Int) = return ()
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| otherwise = do
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msg <- BS.hGet handle (megabytes 5)
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_ <- sink msg
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streamFiveMBNTimes handle (left - 1) sink
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{-# NOINLINE manager' #-}
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manager' :: C.Manager
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manager' = unsafePerformIO $ C.newManager C.defaultManagerSettings
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runClient :: ClientM a -> BaseUrl -> IO (Either ServantError a)
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runClient x baseUrl' = runClientM x (mkClientEnv manager' baseUrl')
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runResultStream :: ResultStream a
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-> IO ( Maybe (Either String a)
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, Maybe (Either String a)
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, Maybe (Either String a)
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, Maybe (Either String a))
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runResultStream (ResultStream k)
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= k $ \act -> (,,,) <$> act <*> act <*> act <*> act
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streamSpec :: Spec
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streamSpec = beforeAll (CS.startWaiApp server) $ afterAll CS.endWaiApp $ do
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it "works with Servant.API.StreamGet.Newline" $ \(_, baseUrl) -> do
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Right res <- runClient getGetNL baseUrl
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let jra = Just (Right alice)
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jrb = Just (Right bob)
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runResultStream res `shouldReturn` (jra, jrb, jra, Nothing)
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it "works with Servant.API.StreamGet.Netstring" $ \(_, baseUrl) -> do
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Right res <- runClient getGetNS baseUrl
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let jra = Just (Right alice)
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jrb = Just (Right bob)
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runResultStream res `shouldReturn` (jra, jrb, jra, Nothing)
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it "streams in constant memory" $ \(_, baseUrl) -> do
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Right (ResultStream res) <- runClient getGetALot baseUrl
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let consumeNChunks n = replicateM_ n (res void)
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consumeNChunks 900
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#if MIN_VERSION_base(4,10,0)
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memUsed <- gcdetails_mem_in_use_bytes . gc <$> getRTSStats
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#else
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memUsed <- currentBytesUsed <$> getGCStats
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#endif
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memUsed `shouldSatisfy` (< megabytes 22)
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megabytes :: Num a => a -> a
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megabytes n = n * (1000 ^ (2 :: Int))
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