{-# LANGUAGE CPP #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
import Blaze.ByteString.Builder (fromByteString)
import Control.Concurrent (forkIO, killThread, newEmptyMVar,
putMVar, takeMVar, threadDelay)
import Control.Exception (IOException, bracket, onException,
try)
import Control.Monad (forever)
import Control.Monad.IO.Class (liftIO)
import qualified Data.ByteString as S
import qualified Data.ByteString.Char8 as S8
import qualified Data.ByteString.Lazy.Char8 as L8
import Data.Conduit (Flush (..), await, runResourceT,
yield, ($$+-))
import Data.Conduit.Network (HostPreference (HostIPv4, HostAny),
ServerSettings, bindPort,
runTCPServer, serverAfterBind,
serverSettings)
import qualified Data.Conduit.Network
import qualified Data.IORef as I
import qualified Network.HTTP.Conduit as HC
import Network.HTTP.ReverseProxy (ProxyDest (..),
WaiProxyResponse (..),
defaultOnExc, rawProxyTo,
waiProxyTo, waiToRaw)
import Network.HTTP.Types (status200)
import Network.Socket (sClose)
import Network.Wai (Response (ResponseFile, ResponseSource),
rawPathInfo, responseLBS)
import qualified Network.Wai
import Network.Wai.Handler.Warp (defaultSettings, run, runSettings,
settingsBeforeMainLoop,
settingsPort)
import System.IO.Unsafe (unsafePerformIO)
import System.Timeout.Lifted (timeout)
import Test.Hspec (describe, hspec, it, shouldBe)
nextPort :: I.IORef Int
nextPort = unsafePerformIO $ I.newIORef 15452
getPort :: IO Int
getPort = do
port <- I.atomicModifyIORef nextPort $ \p -> (p + 1, p)
esocket <- try $ bindPort port HostIPv4
case esocket of
Left (_ :: IOException) -> getPort
Right socket -> do
sClose socket
return port
withWApp :: Network.Wai.Application -> (Int -> IO ()) -> IO ()
withWApp app f = do
port <- getPort
baton <- newEmptyMVar
bracket
(forkIO $ runSettings defaultSettings
{ settingsPort = port
, settingsBeforeMainLoop = putMVar baton ()
} app `onException` putMVar baton ())
killThread
(const $ takeMVar baton >> f port)
withCApp :: Data.Conduit.Network.Application IO -> (Int -> IO ()) -> IO ()
withCApp app f = do
port <- getPort
baton <- newEmptyMVar
let start = putMVar baton ()
settings :: ServerSettings IO
settings = (serverSettings port HostAny :: ServerSettings IO) { serverAfterBind = const start }
bracket
(forkIO $ runTCPServer settings app `onException` start)
killThread
(const $ takeMVar baton >> f port)
withMan :: (HC.Manager -> IO ()) -> IO ()
withMan = HC.withManager . (liftIO .)
main :: IO ()
main = hspec $ do
describe "http-reverse-proxy" $ do
it "works" $
let content = "mainApp"
in withMan $ \manager ->
withWApp (const $ return $ responseLBS status200 [] content) $ \port1 ->
withWApp (waiProxyTo (const $ return $ WPRProxyDest $ ProxyDest "127.0.0.1" port1) defaultOnExc manager) $ \port2 ->
withCApp (rawProxyTo (const $ return $ Right $ ProxyDest "127.0.0.1" port2)) $ \port3 -> do
lbs <- HC.simpleHttp $ "http://127.0.0.1:" ++ show port3
lbs `shouldBe` content
it "modified path" $
let content = "/somepath"
app req = return $ responseLBS status200 [] $ L8.fromChunks [rawPathInfo req]
modReq pdest req = return $ WPRModifiedRequest
(req { rawPathInfo = content })
pdest
in withMan $ \manager ->
withWApp app $ \port1 ->
withWApp (waiProxyTo (modReq $ ProxyDest "127.0.0.1" port1) defaultOnExc manager) $ \port2 ->
withCApp (rawProxyTo (const $ return $ Right $ ProxyDest "127.0.0.1" port2)) $ \port3 -> do
lbs <- HC.simpleHttp $ "http://127.0.0.1:" ++ show port3
S8.concat (L8.toChunks lbs) `shouldBe` content
it "deals with streaming data" $
let app _ = return $ ResponseSource status200 [] $ forever $ do
yield $ Chunk $ fromByteString "hello"
yield Flush
liftIO $ threadDelay 10000000
in withMan $ \manager ->
withWApp app $ \port1 ->
withWApp (waiProxyTo (const $ return $ WPRProxyDest $ ProxyDest "127.0.0.1" port1) defaultOnExc manager) $ \port2 -> do
req <- HC.parseUrl $ "http://127.0.0.1:" ++ show port2
mbs <- runResourceT $ timeout 1000000 $ do
res <- HC.http req manager
HC.responseBody res $$+- await
mbs `shouldBe` Just (Just "hello")
#if MIN_VERSION_wai(1, 4, 0)
it "passes on body length" $
let app req = return $ responseLBS
status200
[("uplength", show' $ Network.Wai.requestBodyLength req)]
""
body = "some body"
show' Network.Wai.ChunkedBody = "chunked"
show' (Network.Wai.KnownLength i) = S8.pack $ show i
in withMan $ \manager ->
withWApp app $ \port1 ->
withWApp (waiProxyTo (const $ return $ WPRProxyDest $ ProxyDest "127.0.0.1" port1) defaultOnExc manager) $ \port2 -> do
req' <- HC.parseUrl $ "http://127.0.0.1:" ++ show port2
let req = req'
{ HC.requestBody = HC.RequestBodyBS body
}
mlen <- runResourceT $ do
res <- HC.http req manager
return $ lookup "uplength" $ HC.responseHeaders res
mlen `shouldBe` Just (show'
$ Network.Wai.KnownLength
$ fromIntegral
$ S.length body)
#endif
describe "waiToRaw" $ do
it "works" $ do
let content = "waiToRaw"
waiApp = const $ return $ responseLBS status200 [] content
rawApp = waiToRaw waiApp
withCApp (rawProxyTo (const $ return $ Left rawApp)) $ \port -> do
lbs <- HC.simpleHttp $ "http://127.0.0.1:" ++ show port
lbs `shouldBe` content
it "sends files" $ do
let content = "PONG"
fp = "pong"
waiApp = const $ return $ ResponseFile status200 [] fp Nothing
rawApp = waiToRaw waiApp
writeFile fp content
withCApp (rawProxyTo (const $ return $ Left rawApp)) $ \port -> do
lbs <- HC.simpleHttp $ "http://127.0.0.1:" ++ show port
lbs `shouldBe` L8.pack content