323 lines
13 KiB
Haskell
323 lines
13 KiB
Haskell
{-# LANGUAGE CPP #-}
|
|
{-# LANGUAGE OverloadedStrings #-}
|
|
{-# LANGUAGE PatternGuards #-}
|
|
{-# LANGUAGE RankNTypes #-}
|
|
{-# LANGUAGE RecordWildCards #-}
|
|
{-# LANGUAGE TemplateHaskell #-}
|
|
{-# LANGUAGE FlexibleContexts #-}
|
|
module Yesod.Core.Internal.Run where
|
|
|
|
import Yesod.Core.Internal.Response
|
|
import Blaze.ByteString.Builder (toByteString)
|
|
import Control.Applicative ((<$>))
|
|
import Control.Exception (fromException, bracketOnError, evaluate)
|
|
import qualified Control.Exception as E
|
|
import Control.Exception.Lifted (catch)
|
|
import Control.Monad (mplus)
|
|
import Control.Monad.IO.Class (MonadIO)
|
|
import Control.Monad.IO.Class (liftIO)
|
|
import Control.Monad.Logger (LogLevel (LevelError), LogSource,
|
|
liftLoc)
|
|
import Control.Monad.Trans.Resource (runResourceT, withInternalState, runInternalState, createInternalState, closeInternalState)
|
|
import qualified Data.ByteString as S
|
|
import qualified Data.ByteString.Char8 as S8
|
|
import qualified Data.IORef as I
|
|
import qualified Data.Map as Map
|
|
import Data.Maybe (isJust)
|
|
import Data.Maybe (fromMaybe)
|
|
import Data.Monoid (appEndo, mempty)
|
|
import Data.Text (Text)
|
|
import qualified Data.Text as T
|
|
import Data.Text.Encoding (encodeUtf8)
|
|
import Data.Text.Encoding (decodeUtf8With)
|
|
import Data.Text.Encoding.Error (lenientDecode)
|
|
import Language.Haskell.TH.Syntax (Loc, qLocation)
|
|
import qualified Network.HTTP.Types as H
|
|
import Network.Wai
|
|
import Network.Wai.Internal
|
|
import Prelude hiding (catch)
|
|
import System.Log.FastLogger (LogStr, toLogStr)
|
|
import System.Random (newStdGen)
|
|
import Yesod.Core.Content
|
|
import Yesod.Core.Class.Yesod
|
|
import Yesod.Core.Types
|
|
import Yesod.Core.Internal.Request (parseWaiRequest,
|
|
tooLargeResponse)
|
|
import Yesod.Routes.Class (Route, renderRoute)
|
|
import Control.DeepSeq (($!!), NFData)
|
|
import Control.Monad (liftM)
|
|
|
|
returnDeepSessionMap :: Monad m => SessionMap -> m SessionMap
|
|
#if MIN_VERSION_bytestring(0, 10, 0)
|
|
returnDeepSessionMap sm = return $!! sm
|
|
#else
|
|
returnDeepSessionMap sm = fmap unWrappedBS `liftM` (return $!! fmap WrappedBS sm)
|
|
|
|
-- | Work around missing NFData instance for bytestring 0.9.
|
|
newtype WrappedBS = WrappedBS { unWrappedBS :: S8.ByteString }
|
|
instance NFData WrappedBS
|
|
#endif
|
|
|
|
-- | Function used internally by Yesod in the process of converting a
|
|
-- 'HandlerT' into an 'Application'. Should not be needed by users.
|
|
runHandler :: ToTypedContent c
|
|
=> RunHandlerEnv site
|
|
-> HandlerT site IO c
|
|
-> YesodApp
|
|
runHandler rhe@RunHandlerEnv {..} handler yreq = withInternalState $ \resState -> do
|
|
let toErrorHandler e =
|
|
case fromException e of
|
|
Just (HCError x) -> x
|
|
_ -> InternalError $ T.pack $ show e
|
|
istate <- liftIO $ I.newIORef GHState
|
|
{ ghsSession = reqSession yreq
|
|
, ghsRBC = Nothing
|
|
, ghsIdent = 1
|
|
, ghsCache = mempty
|
|
, ghsCacheBy = mempty
|
|
, ghsHeaders = mempty
|
|
}
|
|
let hd = HandlerData
|
|
{ handlerRequest = yreq
|
|
, handlerEnv = rhe
|
|
, handlerState = istate
|
|
, handlerToParent = const ()
|
|
, handlerResource = resState
|
|
}
|
|
contents' <- catch (fmap Right $ unHandlerT handler hd)
|
|
(\e -> return $ Left $ maybe (HCError $ toErrorHandler e) id
|
|
$ fromException e)
|
|
state <- liftIO $ I.readIORef istate
|
|
|
|
(finalSession, mcontents1) <- (do
|
|
finalSession <- returnDeepSessionMap (ghsSession state)
|
|
return (finalSession, Nothing)) `E.catch` \e -> return
|
|
(Map.empty, Just $! HCError $! InternalError $! T.pack $! show (e :: E.SomeException))
|
|
|
|
(headers, mcontents2) <- (do
|
|
headers <- return $!! appEndo (ghsHeaders state) []
|
|
return (headers, Nothing)) `E.catch` \e -> return
|
|
([], Just $! HCError $! InternalError $! T.pack $! show (e :: E.SomeException))
|
|
|
|
let contents =
|
|
case mcontents1 `mplus` mcontents2 of
|
|
Just x -> x
|
|
Nothing -> either id (HCContent defaultStatus . toTypedContent) contents'
|
|
let handleError e = flip runInternalState resState $ do
|
|
yar <- rheOnError e yreq
|
|
{ reqSession = finalSession
|
|
}
|
|
case yar of
|
|
YRPlain status' hs ct c sess ->
|
|
let hs' = headers ++ hs
|
|
status
|
|
| status' == defaultStatus = getStatus e
|
|
| otherwise = status'
|
|
in return $ YRPlain status hs' ct c sess
|
|
YRWai _ -> return yar
|
|
let sendFile' ct fp p =
|
|
return $ YRPlain H.status200 headers ct (ContentFile fp p) finalSession
|
|
contents1 <- evaluate contents `E.catch` \e -> return
|
|
(HCError $! InternalError $! T.pack $! show (e :: E.SomeException))
|
|
case contents1 of
|
|
HCContent status (TypedContent ct c) -> do
|
|
ec' <- liftIO $ evaluateContent c
|
|
case ec' of
|
|
Left e -> handleError e
|
|
Right c' -> return $ YRPlain status headers ct c' finalSession
|
|
HCError e -> handleError e
|
|
HCRedirect status loc -> do
|
|
let disable_caching x =
|
|
Header "Cache-Control" "no-cache, must-revalidate"
|
|
: Header "Expires" "Thu, 01 Jan 1970 05:05:05 GMT"
|
|
: x
|
|
hs = (if status /= H.movedPermanently301 then disable_caching else id)
|
|
$ Header "Location" (encodeUtf8 loc) : headers
|
|
return $ YRPlain
|
|
status hs typePlain emptyContent
|
|
finalSession
|
|
HCSendFile ct fp p -> catch
|
|
(sendFile' ct fp p)
|
|
(handleError . toErrorHandler)
|
|
HCCreated loc -> do
|
|
let hs = Header "Location" (encodeUtf8 loc) : headers
|
|
return $ YRPlain
|
|
H.status201
|
|
hs
|
|
typePlain
|
|
emptyContent
|
|
finalSession
|
|
HCWai r -> return $ YRWai r
|
|
HCWaiApp a -> return $ YRWaiApp a
|
|
|
|
safeEh :: (Loc -> LogSource -> LogLevel -> LogStr -> IO ())
|
|
-> ErrorResponse
|
|
-> YesodApp
|
|
safeEh log' er req = do
|
|
liftIO $ log' $(qLocation >>= liftLoc) "yesod-core" LevelError
|
|
$ toLogStr $ "Error handler errored out: " ++ show er
|
|
return $ YRPlain
|
|
H.status500
|
|
[]
|
|
typePlain
|
|
(toContent ("Internal Server Error" :: S.ByteString))
|
|
(reqSession req)
|
|
|
|
-- | Run a 'HandlerT' completely outside of Yesod. This
|
|
-- function comes with many caveats and you shouldn't use it
|
|
-- unless you fully understand what it's doing and how it works.
|
|
--
|
|
-- As of now, there's only one reason to use this function at
|
|
-- all: in order to run unit tests of functions inside 'HandlerT'
|
|
-- but that aren't easily testable with a full HTTP request.
|
|
-- Even so, it's better to use @wai-test@ or @yesod-test@ instead
|
|
-- of using this function.
|
|
--
|
|
-- This function will create a fake HTTP request (both @wai@'s
|
|
-- 'Request' and @yesod@'s 'Request') and feed it to the
|
|
-- @HandlerT@. The only useful information the @HandlerT@ may
|
|
-- get from the request is the session map, which you must supply
|
|
-- as argument to @runFakeHandler@. All other fields contain
|
|
-- fake information, which means that they can be accessed but
|
|
-- won't have any useful information. The response of the
|
|
-- @HandlerT@ is completely ignored, including changes to the
|
|
-- session, cookies or headers. We only return you the
|
|
-- @HandlerT@'s return value.
|
|
runFakeHandler :: (Yesod site, MonadIO m) =>
|
|
SessionMap
|
|
-> (site -> Logger)
|
|
-> site
|
|
-> HandlerT site IO a
|
|
-> m (Either ErrorResponse a)
|
|
runFakeHandler fakeSessionMap logger site handler = liftIO $ do
|
|
ret <- I.newIORef (Left $ InternalError "runFakeHandler: no result")
|
|
let handler' = do liftIO . I.writeIORef ret . Right =<< handler
|
|
return ()
|
|
let yapp = runHandler
|
|
RunHandlerEnv
|
|
{ rheRender = yesodRender site $ resolveApproot site fakeWaiRequest
|
|
, rheRoute = Nothing
|
|
, rheSite = site
|
|
, rheUpload = fileUpload site
|
|
, rheLog = messageLoggerSource site $ logger site
|
|
, rheOnError = errHandler
|
|
}
|
|
handler'
|
|
errHandler err req = do
|
|
liftIO $ I.writeIORef ret (Left err)
|
|
return $ YRPlain
|
|
H.status500
|
|
[]
|
|
typePlain
|
|
(toContent ("runFakeHandler: errHandler" :: S8.ByteString))
|
|
(reqSession req)
|
|
fakeWaiRequest = Request
|
|
{ requestMethod = "POST"
|
|
, httpVersion = H.http11
|
|
, rawPathInfo = "/runFakeHandler/pathInfo"
|
|
, rawQueryString = ""
|
|
, requestHeaderHost = Nothing
|
|
, requestHeaders = []
|
|
, isSecure = False
|
|
, remoteHost = error "runFakeHandler-remoteHost"
|
|
, pathInfo = ["runFakeHandler", "pathInfo"]
|
|
, queryString = []
|
|
, requestBody = return mempty
|
|
, vault = mempty
|
|
, requestBodyLength = KnownLength 0
|
|
}
|
|
fakeRequest =
|
|
YesodRequest
|
|
{ reqGetParams = []
|
|
, reqCookies = []
|
|
, reqWaiRequest = fakeWaiRequest
|
|
, reqLangs = []
|
|
, reqToken = Just "NaN" -- not a nonce =)
|
|
, reqAccept = []
|
|
, reqSession = fakeSessionMap
|
|
}
|
|
_ <- runResourceT $ yapp fakeRequest
|
|
I.readIORef ret
|
|
{-# WARNING runFakeHandler "Usually you should *not* use runFakeHandler unless you really understand how it works and why you need it." #-}
|
|
|
|
yesodRunner :: (ToTypedContent res, Yesod site)
|
|
=> HandlerT site IO res
|
|
-> YesodRunnerEnv site
|
|
-> Maybe (Route site)
|
|
-> Application
|
|
yesodRunner handler' YesodRunnerEnv {..} route req sendResponse
|
|
| Just maxLen <- mmaxLen, KnownLength len <- requestBodyLength req, maxLen < len = sendResponse tooLargeResponse
|
|
| otherwise = do
|
|
let dontSaveSession _ = return []
|
|
(session, saveSession) <- liftIO $ do
|
|
maybe (return (Map.empty, dontSaveSession)) (\sb -> sbLoadSession sb req) yreSessionBackend
|
|
let mkYesodReq = parseWaiRequest req session (isJust yreSessionBackend) mmaxLen
|
|
yreq <-
|
|
case mkYesodReq of
|
|
Left yreq -> return yreq
|
|
Right needGen -> liftIO $ needGen <$> newStdGen
|
|
let ra = resolveApproot yreSite req
|
|
let log' = messageLoggerSource yreSite yreLogger
|
|
-- We set up two environments: the first one has a "safe" error handler
|
|
-- which will never throw an exception. The second one uses the
|
|
-- user-provided errorHandler function. If that errorHandler function
|
|
-- errors out, it will use the safeEh below to recover.
|
|
rheSafe = RunHandlerEnv
|
|
{ rheRender = yesodRender yreSite ra
|
|
, rheRoute = route
|
|
, rheSite = yreSite
|
|
, rheUpload = fileUpload yreSite
|
|
, rheLog = log'
|
|
, rheOnError = safeEh log'
|
|
}
|
|
rhe = rheSafe
|
|
{ rheOnError = runHandler rheSafe . errorHandler
|
|
}
|
|
|
|
E.bracket createInternalState closeInternalState $ \is -> do
|
|
yreq' <- yreq
|
|
yar <- runInternalState (runHandler rhe handler yreq') is
|
|
yarToResponse yar saveSession yreq' req is sendResponse
|
|
where
|
|
mmaxLen = maximumContentLength yreSite route
|
|
handler = yesodMiddleware handler'
|
|
|
|
yesodRender :: Yesod y
|
|
=> y
|
|
-> ResolvedApproot
|
|
-> Route y
|
|
-> [(Text, Text)] -- ^ url query string
|
|
-> Text
|
|
yesodRender y ar url params =
|
|
decodeUtf8With lenientDecode $ toByteString $
|
|
fromMaybe
|
|
(joinPath y ar ps
|
|
$ params ++ params')
|
|
(urlRenderOverride y url)
|
|
where
|
|
(ps, params') = renderRoute url
|
|
|
|
resolveApproot :: Yesod master => master -> Request -> ResolvedApproot
|
|
resolveApproot master req =
|
|
case approot of
|
|
ApprootRelative -> ""
|
|
ApprootStatic t -> t
|
|
ApprootMaster f -> f master
|
|
ApprootRequest f -> f master req
|
|
|
|
stripHandlerT :: HandlerT child (HandlerT parent m) a
|
|
-> (parent -> child)
|
|
-> (Route child -> Route parent)
|
|
-> Maybe (Route child)
|
|
-> HandlerT parent m a
|
|
stripHandlerT (HandlerT f) getSub toMaster newRoute = HandlerT $ \hd -> do
|
|
let env = handlerEnv hd
|
|
($ hd) $ unHandlerT $ f hd
|
|
{ handlerEnv = env
|
|
{ rheSite = getSub $ rheSite env
|
|
, rheRoute = newRoute
|
|
, rheRender = \url params -> rheRender env (toMaster url) params
|
|
}
|
|
, handlerToParent = toMaster
|
|
}
|