109 lines
3.3 KiB
Haskell
109 lines
3.3 KiB
Haskell
{-# LANGUAGE DataKinds #-}
|
|
{-# LANGUAGE OverloadedStrings #-}
|
|
{-# LANGUAGE ScopedTypeVariables #-}
|
|
{-# LANGUAGE TupleSections #-}
|
|
{-# LANGUAGE TypeOperators #-}
|
|
|
|
-- | This module tests whether streaming works from client to server
|
|
-- with a server implemented with servant-server.
|
|
module Servant.Server.StreamingSpec where
|
|
|
|
import Control.Concurrent
|
|
import Control.Exception hiding
|
|
(Handler)
|
|
import Control.Monad.IO.Class
|
|
import qualified Data.ByteString as Strict
|
|
import qualified Data.ByteString.Lazy as Lazy
|
|
import Network.HTTP.Types
|
|
import Network.Wai
|
|
import Network.Wai.Internal
|
|
import Prelude ()
|
|
import Prelude.Compat
|
|
import Servant
|
|
import qualified System.Timeout
|
|
import Test.Hspec
|
|
|
|
type TestAPI =
|
|
ReqBody '[OctetStream] Lazy.ByteString :> Get '[JSON] NoContent
|
|
|
|
testAPI :: Proxy TestAPI
|
|
testAPI = Proxy
|
|
|
|
spec :: Spec
|
|
spec = do
|
|
-- The idea of this test is this:
|
|
--
|
|
-- - The mock client will
|
|
-- - send some data in the request body, but not all,
|
|
-- - wait for the server to acknowledge (outside of http, through an MVar)
|
|
-- that the server received some data,
|
|
-- - send the rest of the request body.
|
|
-- - The mock server will
|
|
-- - receive some data,
|
|
-- - notify the client that it received some data,
|
|
-- - receive the rest of the data,
|
|
-- - respond with an empty result.
|
|
it "client to server can stream lazy ByteStrings" $ timeout $ do
|
|
serverReceivedFirstChunk <- newWaiter
|
|
|
|
-- - streams some test data
|
|
-- - waits for serverReceivedFirstChunk
|
|
-- - streams some more test data
|
|
streamTestData <- do
|
|
mvar :: MVar [IO Strict.ByteString] <- newMVar $
|
|
map return (replicate 1000 "foo") ++
|
|
(waitFor serverReceivedFirstChunk >> return "foo") :
|
|
map return (replicate 1000 "foo")
|
|
return $ modifyMVar mvar $ \ actions -> case actions of
|
|
(a : r) -> (r, ) <$> a
|
|
[] -> return ([], "")
|
|
|
|
let request = defaultRequest {
|
|
requestBody = streamTestData,
|
|
requestBodyLength = ChunkedBody
|
|
}
|
|
|
|
-- - receives the first chunk
|
|
-- - notifies serverReceivedFirstChunk
|
|
-- - receives the rest of the request
|
|
let handler :: Lazy.ByteString -> Handler NoContent
|
|
handler input = liftIO $ do
|
|
let prefix = Lazy.take 3 input
|
|
prefix `shouldBe` "foo"
|
|
notify serverReceivedFirstChunk ()
|
|
input `shouldBe` mconcat (replicate 2001 "foo")
|
|
return NoContent
|
|
|
|
app = serve testAPI handler
|
|
response <- executeRequest app request
|
|
statusCode (responseStatus response) `shouldBe` 200
|
|
|
|
executeRequest :: Application -> Request -> IO Response
|
|
executeRequest app request = do
|
|
responseMVar <- newEmptyMVar
|
|
let respond response = do
|
|
putMVar responseMVar response
|
|
return ResponseReceived
|
|
ResponseReceived <- app request respond
|
|
takeMVar responseMVar
|
|
|
|
timeout :: IO a -> IO a
|
|
timeout action = do
|
|
result <- System.Timeout.timeout 1000000 action
|
|
maybe (throwIO $ ErrorCall "timeout") return result
|
|
|
|
-- * waiter
|
|
|
|
data Waiter a
|
|
= Waiter {
|
|
notify :: a -> IO (),
|
|
waitFor :: IO a
|
|
}
|
|
|
|
newWaiter :: IO (Waiter a)
|
|
newWaiter = do
|
|
mvar <- newEmptyMVar
|
|
return $ Waiter {
|
|
notify = putMVar mvar,
|
|
waitFor = readMVar mvar
|
|
}
|