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{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
------------------------------------------------------------------------------
module Snap.Test.Common where
------------------------------------------------------------------------------
import Control.DeepSeq (deepseq)
import Control.Exception.Lifted (SomeException (..), catch, evaluate, finally, try)
import Control.Monad (liftM, replicateM)
import Control.Monad.IO.Class (MonadIO (..))
import Control.Monad.Trans.Control (MonadBaseControl)
import Data.ByteString.Builder (byteString, toLazyByteString)
import Data.ByteString.Char8 (ByteString)
import qualified Data.ByteString.Char8 as S
import qualified Data.ByteString.Lazy as L
import Data.Monoid (Monoid (mappend, mempty))
import Data.Typeable (Typeable, typeOf)
import Network.Socket (Socket)
import qualified Network.Socket as N hiding (recv)
import System.Timeout (timeout)
import Test.HUnit (assertFailure)
import Test.QuickCheck (Arbitrary (arbitrary), choose)
import qualified Network.Socket.ByteString as N
#if !(MIN_VERSION_base(4,6,0))
import Prelude hiding (catch)
#endif
------------------------------------------------------------------------------
instance Arbitrary S.ByteString where
arbitrary = liftM S.pack arbitrary
instance Arbitrary L.ByteString where
arbitrary = do
n <- choose(0,5)
chunks <- replicateM n arbitrary
return $! L.fromChunks chunks
------------------------------------------------------------------------------
expectException :: IO a -> IO ()
expectException m = do
e <- try m
case e of
Left (z::SomeException) -> length (show z) `seq` return ()
Right _ -> assertFailure "expected exception, didn't get it"
------------------------------------------------------------------------------
expectExceptionBeforeTimeout :: IO a -- ^ action to run
-> Int -- ^ number of seconds to expect
-- exception by
-> IO Bool
expectExceptionBeforeTimeout act nsecs = do
x <- timeout (nsecs * (10::Int)^(6::Int)) f
case x of
Nothing -> return False
(Just y) -> return y
where
f = (act >> return False) `catch` \(e::SomeException) -> do
if show e == "<<timeout>>"
then return False
else return True
------------------------------------------------------------------------------
withSock :: Int -> (Socket -> IO a) -> IO a
withSock port go = do
addr <- liftM (N.addrAddress . Prelude.head) $
N.getAddrInfo (Just myHints)
(Just "127.0.0.1")
(Just $ show port)
sock <- N.socket N.AF_INET N.Stream N.defaultProtocol
N.connect sock addr
go sock `finally` close sock
where
#if MIN_VERSION_network(2,7,0)
close = N.close
#else
close = N.sClose
#endif
myHints = N.defaultHints { N.addrFlags = [ N.AI_NUMERICHOST ] }
------------------------------------------------------------------------------
recvAll :: Socket -> IO ByteString
recvAll sock = do
b <- f mempty sock
return $! S.concat $ L.toChunks $ toLazyByteString b
where
f b sk = do
s <- N.recv sk 100000
if S.null s
then return b
else f (b `mappend` byteString s) sk
------------------------------------------------------------------------------
ditchHeaders :: [ByteString] -> [ByteString]
ditchHeaders ("":xs) = xs
ditchHeaders ("\r":xs) = xs
ditchHeaders (_:xs) = ditchHeaders xs
ditchHeaders [] = []
------------------------------------------------------------------------------
forceSameType :: a -> a -> a
forceSameType _ a = a
------------------------------------------------------------------------------
-- | Kill the false negative on derived show instances.
coverShowInstance :: (Monad m, Show a) => a -> m ()
coverShowInstance x = a `deepseq` b `deepseq` c `deepseq` return ()
where
a = showsPrec 0 x ""
b = show x
c = showList [x] ""
------------------------------------------------------------------------------
coverReadInstance :: (MonadIO m, Read a) => a -> m ()
coverReadInstance x = do
liftIO $ eatException $ evaluate $ forceSameType [(x,"")] $ readsPrec 0 ""
liftIO $ eatException $ evaluate $ forceSameType [([x],"")] $ readList ""
------------------------------------------------------------------------------
coverEqInstance :: (Monad m, Eq a) => a -> m ()
coverEqInstance x = a `seq` b `seq` return ()
where
a = x == x
b = x /= x
------------------------------------------------------------------------------
coverOrdInstance :: (Monad m, Ord a) => a -> m ()
coverOrdInstance x = a `deepseq` b `deepseq` return ()
where
a = [ x < x
, x >= x
, x > x
, x <= x
, compare x x == EQ ]
b = min a $ max a a
------------------------------------------------------------------------------
coverTypeableInstance :: (Monad m, Typeable a) => a -> m ()
coverTypeableInstance a = typeOf a `seq` return ()
------------------------------------------------------------------------------
eatException :: (MonadBaseControl IO m) => m a -> m ()
eatException a = (a >> return ()) `catch` handler
where
handler :: (MonadBaseControl IO m) => SomeException -> m ()
handler _ = return ()
------------------------------------------------------------------------------
timeoutIn :: Int -> IO a -> IO a
timeoutIn n m = timeout (n * 1000000) m >>= maybe (fail "timeout") return
|
