+-- #prune
+
+-- |This is the Resource Monad; monadic actions to define the behavior
+-- of each resources. The 'Resource' Monad is a kind of 'Prelude.IO'
+-- Monad thus it implements 'Control.Monad.Trans.MonadIO' class. It is
+-- also a state machine.
+--
+-- Request Processing Flow:
+--
+-- 1. A client issues an HTTP request.
+--
+-- 2. If the URI of it matches to any resource, the corresponding
+-- 'Resource' Monad starts running on a newly spawned thread.
+--
+-- 3. The 'Resource' Monad looks at the request header, find (or not
+-- find) an entity, receive the request body (if any), decide the
+-- response header, and decide the response body. This process
+-- will be discussed later.
+--
+-- 4. The 'Resource' Monad and its thread stops running. The client
+-- may or may not be sending us the next request at this point.
+--
+-- 'Resource' Monad takes the following states. The initial state is
+-- /Examining Request/ and the final state is /Done/.
+--
+-- [/Examining Request/] In this state, a 'Resource' looks at the
+-- request header and thinks about an entity for it. If there is a
+-- suitable entity, the 'Resource' tells the system an entity tag
+-- and its last modification time ('foundEntity'). If it found no
+-- entity, it tells the system so ('foundNoEntity'). In case it is
+-- impossible to decide the existence of entity, which is a typical
+-- case for POST requests, 'Resource' does nothing in this state.
+--
+-- [/Getting Body/] A 'Resource' asks the system to receive a
+-- request body from client. Before actually reading from the
+-- socket, the system sends \"100 Continue\" to the client if need
+-- be. When a 'Resource' transits to the next state without
+-- receiving all or part of request body, the system still reads it
+-- and just throws it away.
+--
+-- [/Deciding Header/] A 'Resource' makes a decision of status code
+-- and response header. When it transits to the next state, the
+-- system checks the validness of response header and then write
+-- them to the socket.
+--
+-- [/Deciding Body/] In this state, a 'Resource' asks the system to
+-- write some response body to the socket. When it transits to the
+-- next state without writing any response body, the system
+-- completes it depending on the status code.
+--
+-- [/Done/] Everything is over. A 'Resource' can do nothing for the
+-- HTTP interaction anymore.
+--
+-- Note that the state transition is one-way: for instance, it is an
+-- error to try to read a request body after writing some
+-- response. This limitation is for efficiency. We don't want to read
+-- the entire request before starting 'Resource', nor we don't want to
+-- postpone writing the entire response till the end of 'Resource'
+-- computation.
+
module Network.HTTP.Lucu.Resource
- ( Resource
-
- , getConfig -- Resource Config
- , getRequest -- Resource Request
- , getMethod -- Resource Method
- , getRequestURI -- Resource URI
- , getResourcePath -- Resource [String]
- , getPathInfo -- Resource [String]
-
- , getHeader -- String -> Resource (Maybe String)
- , getAccept -- Resource [MIMEType]
- , getContentType -- Resource (Maybe MIMEType)
-
- , foundEntity -- ETag -> ClockTime -> Resource ()
- , foundETag -- ETag -> Resource ()
- , foundTimeStamp -- ClockTime -> Resource ()
- , foundNoEntity -- Maybe String -> Resource ()
-
- , input -- Int -> Resource String
- , inputChunk -- Int -> Resource String
- , inputBS -- Int -> Resource ByteString
- , inputChunkBS -- Int -> Resource ByteString
- , defaultLimit -- Int
-
- , setStatus -- StatusCode -> Resource ()
- , setHeader -- String -> String -> Resource ()
- , redirect -- StatusCode -> URI -> Resource ()
- , setETag -- ETag -> Resource ()
- , setLastModified -- ClockTime -> Resource ()
- , setContentType -- MIMEType -> Resource ()
-
- , output -- String -> Resource ()
- , outputChunk -- String -> Resource ()
- , outputBS -- ByteString -> Resource ()
- , outputChunkBS -- ByteString -> Resource ()
-
- , driftTo -- InteractionState -> Resource ()
+ (
+ -- * Monad
+ Resource
+ , runRes -- private
+
+ -- * Actions
+
+ -- ** Getting request header
+
+ -- |These actions can be computed regardless of the current state,
+ -- and they don't change the state.
+ , getConfig
+ , getRemoteAddr
+ , getRemoteAddr'
+ , getRequest
+ , getMethod
+ , getRequestURI
+ , getRequestVersion
+ , getResourcePath
+ , getPathInfo
+ , getQueryForm
+ , getHeader
+ , getAccept
+ , getAcceptEncoding
+ , isEncodingAcceptable
+ , getContentType
+
+ -- ** Finding an entity
+
+ -- |These actions can be computed only in the /Examining Request/
+ -- state. After the computation, the 'Resource' transits to
+ -- /Getting Body/ state.
+ , foundEntity
+ , foundETag
+ , foundTimeStamp
+ , foundNoEntity
+
+ -- ** Getting a request body
+
+ -- |Computation of these actions changes the state to /Getting
+ -- Body/.
+ , input
+ , inputChunk
+ , inputLBS
+ , inputChunkLBS
+ , inputForm
+ , defaultLimit
+
+ -- ** Setting response headers
+
+ -- |Computation of these actions changes the state to /Deciding
+ -- Header/.
+ , setStatus
+ , setHeader
+ , redirect
+ , setContentType
+ , setLocation
+ , setContentEncoding
+
+ -- ** Writing a response body
+
+ -- |Computation of these actions changes the state to /Deciding
+ -- Body/.
+ , output
+ , outputChunk
+ , outputLBS
+ , outputChunkLBS
+
+ , driftTo
)
where
import Control.Concurrent.STM
import Control.Monad.Reader
+import Data.Bits
+import Data.ByteString.Base (LazyByteString)
import qualified Data.ByteString.Lazy.Char8 as B
-import Data.ByteString.Lazy.Char8 (ByteString)
import Data.List
import Data.Maybe
-import GHC.Conc (unsafeIOToSTM)
import Network.HTTP.Lucu.Abortion
import Network.HTTP.Lucu.Config
+import Network.HTTP.Lucu.ContentCoding
import Network.HTTP.Lucu.DefaultPage
import Network.HTTP.Lucu.ETag
import qualified Network.HTTP.Lucu.Headers as H
import Network.HTTP.Lucu.Response
import Network.HTTP.Lucu.MIMEType
import Network.HTTP.Lucu.Utils
+import Network.Socket
import Network.URI
import System.Time
+-- |The 'Resource' monad. This monad implements
+-- 'Control.Monad.Trans.MonadIO' so it can do any 'Prelude.IO'
+-- actions.
+newtype Resource a = Resource { unRes :: ReaderT Interaction IO a }
-type Resource a = ReaderT Interaction IO a
+instance Functor Resource where
+ fmap f c = Resource (fmap f (unRes c))
+instance Monad Resource where
+ c >>= f = Resource (unRes c >>= unRes . f)
+ return = Resource . return
+ fail = Resource . fail
-getConfig :: Resource Config
-getConfig = do itr <- ask
- return $ itrConfig itr
+instance MonadIO Resource where
+ liftIO = Resource . liftIO
-getRequest :: Resource Request
-getRequest = do itr <- ask
- return $ fromJust $ itrRequest itr
+runRes :: Resource a -> Interaction -> IO a
+runRes r itr
+ = runReaderT (unRes r) itr
+
+getInteraction :: Resource Interaction
+getInteraction = Resource ask
+
+-- |Get the 'Network.HTTP.Lucu.Config.Config' value which is used for
+-- the httpd.
+getConfig :: Resource Config
+getConfig = do itr <- getInteraction
+ return $! itrConfig itr
+
+
+-- |Get the 'Network.Socket.SockAddr' of the remote host. If you want
+-- a string representation instead of 'Network.Socket.SockAddr', use
+-- 'getRemoteAddr''.
+getRemoteAddr :: Resource SockAddr
+getRemoteAddr = do itr <- getInteraction
+ return $! itrRemoteAddr itr
+
+
+-- |Get the string representation of the address of remote host. If
+-- you want a 'Network.Socket.SockAddr' instead of String, use
+-- 'getRemoteAddr'.
+getRemoteAddr' :: Resource String
+getRemoteAddr' = do addr <- getRemoteAddr
+ case addr of
+ -- Network.Socket は IPv6 を考慮してゐないやうだ…
+ (SockAddrInet _ v4addr)
+ -> let b1 = (v4addr `shiftR` 24) .&. 0xFF
+ b2 = (v4addr `shiftR` 16) .&. 0xFF
+ b3 = (v4addr `shiftR` 8) .&. 0xFF
+ b4 = v4addr .&. 0xFF
+ in
+ return $ concat $ intersperse "." $ map show [b1, b2, b3, b4]
+ (SockAddrUnix path)
+ -> return path
+
+
+-- |Get the 'Network.HTTP.Lucu.Request.Request' value which represents
+-- the request header. In general you don't have to use this action.
+getRequest :: Resource Request
+getRequest = do itr <- getInteraction
+ req <- liftIO $! atomically $! readItr itr itrRequest fromJust
+ return req
+
+-- |Get the 'Network.HTTP.Lucu.Request.Method' value of the request.
getMethod :: Resource Method
getMethod = do req <- getRequest
- return $ reqMethod req
-
+ return $! reqMethod req
+-- |Get the URI of the request.
getRequestURI :: Resource URI
getRequestURI = do req <- getRequest
- return $ reqURI req
-
-
+ return $! reqURI req
+
+-- |Get the HTTP version of the request.
+getRequestVersion :: Resource HttpVersion
+getRequestVersion = do req <- getRequest
+ return $! reqVersion req
+
+-- |Get the path of this 'Resource' (to be exact,
+-- 'Network.HTTP.Lucu.Resource.Tree.ResourceDef') in the
+-- 'Network.HTTP.Lucu.Resource.Tree.ResTree'. The result of this
+-- action is the exact path in the tree even if the
+-- 'Network.HTTP.Lucu.Resource.Tree.ResourceDef' is greedy.
+--
+-- Example:
+--
+-- > main = let tree = mkResTree [ (["foo"], resFoo) ]
+-- > in runHttpd defaultConfig tree
+-- >
+-- > resFoo = ResourceDef {
+-- > resIsGreedy = True
+-- > , resGet = Just $ do requestURI <- getRequestURI
+-- > resourcePath <- getResourcePath
+-- > pathInfo <- getPathInfo
+-- > -- uriPath requestURI == "/foo/bar/baz"
+-- > -- resourcePath == ["foo"]
+-- > -- pathInfo == ["bar", "baz"]
+-- > ...
+-- > , ...
+-- > }
getResourcePath :: Resource [String]
-getResourcePath = do itr <- ask
- return $ fromJust $ itrResourcePath itr
+getResourcePath = do itr <- getInteraction
+ return $! fromJust $! itrResourcePath itr
+-- |This is an analogy of CGI PATH_INFO. Its result is always @[]@ if
+-- the 'Network.HTTP.Lucu.Resource.Tree.ResourceDef' is not
+-- greedy. See 'getResourcePath'.
getPathInfo :: Resource [String]
getPathInfo = do rsrcPath <- getResourcePath
reqURI <- getRequestURI
-- る。rsrcPath は全部一致してゐるに決まってゐる（でな
-- ければこの Resource が撰ばれた筈が無い）ので、
-- rsrcPath の長さの分だけ削除すれば良い。
- return $ drop (length rsrcPath) reqPath
-
-
+ return $! drop (length rsrcPath) reqPath
+
+-- | Assume the query part of request URI as
+-- application\/x-www-form-urlencoded, and parse it. This action
+-- doesn't parse the request body. See 'inputForm'.
+getQueryForm :: Resource [(String, String)]
+getQueryForm = do reqURI <- getRequestURI
+ return $! parseWWWFormURLEncoded $ uriQuery reqURI
+
+-- |Get a value of given request header. Comparison of header name is
+-- case-insensitive. Note that this action is not intended to be used
+-- so frequently: there should be actions like 'getContentType' for
+-- every common headers.
getHeader :: String -> Resource (Maybe String)
-getHeader name = do itr <- ask
- return $ H.getHeader name $ fromJust $ itrRequest itr
-
+getHeader name = name `seq`
+ do req <- getRequest
+ return $! H.getHeader name req
+-- |Get a list of 'Network.HTTP.Lucu.MIMEType.MIMEType' enumerated on
+-- header \"Accept\".
getAccept :: Resource [MIMEType]
-getAccept = do accept <- getHeader "Accept"
- if accept == Nothing then
- return []
- else
- case parseStr mimeTypeListP $ fromJust accept of
- (Success xs, _) -> return xs
- _ -> return []
-
-
+getAccept = do acceptM <- getHeader "Accept"
+ case acceptM of
+ Nothing
+ -> return []
+ Just accept
+ -> case parseStr mimeTypeListP accept of
+ (# Success xs, _ #) -> return xs
+ (# _ , _ #) -> abort BadRequest []
+ (Just $ "Unparsable Accept: " ++ accept)
+
+-- |Get a list of @(contentCoding, qvalue)@ enumerated on header
+-- \"Accept-Encoding\". The list is sorted in descending order by
+-- qvalue.
+getAcceptEncoding :: Resource [(String, Maybe Double)]
+getAcceptEncoding
+ = do accEncM <- getHeader "Accept-Encoding"
+ case accEncM of
+ Nothing
+ -- HTTP/1.0 には Accept-Encoding が無い場合の規定が無い
+ -- ので安全の爲 identity が指定された事にする。HTTP/1.1
+ -- の場合は何でも受け入れて良い事になってゐるので "*" が
+ -- 指定された事にする。
+ -> do ver <- getRequestVersion
+ case ver of
+ HttpVersion 1 0 -> return [("identity", Nothing)]
+ HttpVersion 1 1 -> return [("*" , Nothing)]
+ Just ""
+ -- identity のみが許される。
+ -> return [("identity", Nothing)]
+ Just accEnc
+ -> case parseStr acceptEncodingListP accEnc of
+ (# Success x, _ #) -> return $ reverse $ sortBy orderAcceptEncodings x
+ (# _ , _ #) -> abort BadRequest []
+ (Just $ "Unparsable Accept-Encoding: " ++ accEnc)
+
+-- |Check whether a given content-coding is acceptable.
+isEncodingAcceptable :: String -> Resource Bool
+isEncodingAcceptable coding
+ = do accList <- getAcceptEncoding
+ return (flip any accList $ \ (c, q) ->
+ (c == "*" || c `noCaseEq` coding) && q /= Just 0)
+
+
+-- |Get the header \"Content-Type\" as
+-- 'Network.HTTP.Lucu.MIMEType.MIMEType'.
getContentType :: Resource (Maybe MIMEType)
-getContentType = do cType <- getHeader "Content-Type"
- if cType == Nothing then
- return Nothing
- else
- case parseStr mimeTypeP $ fromJust cType of
- (Success t, _) -> return $ Just t
- _ -> return Nothing
-
+getContentType
+ = do cTypeM <- getHeader "Content-Type"
+ case cTypeM of
+ Nothing
+ -> return Nothing
+ Just cType
+ -> case parseStr mimeTypeP cType of
+ (# Success t, _ #) -> return $ Just t
+ (# _ , _ #) -> abort BadRequest []
+ (Just $ "Unparsable Content-Type: " ++ cType)
{- ExaminingRequest 時に使用するアクション群 -}
+-- |Tell the system that the 'Resource' found an entity for the
+-- request URI. If this is a GET or HEAD request, a found entity means
+-- a datum to be replied. If this is a PUT or DELETE request, it means
+-- a datum which was stored for the URI up to now. It is an error to
+-- compute 'foundEntity' if this is a POST request.
+--
+-- Computation of 'foundEntity' performs \"If-Match\" test or
+-- \"If-None-Match\" test if possible. When those tests fail, the
+-- computation of 'Resource' immediately aborts with status \"412
+-- Precondition Failed\" or \"304 Not Modified\" depending on the
+-- situation.
+--
+-- If this is a GET or HEAD request, 'foundEntity' automatically puts
+-- \"ETag\" and \"Last-Modified\" headers into the response.
foundEntity :: ETag -> ClockTime -> Resource ()
foundEntity tag timeStamp
- = do driftTo ExaminingRequest
+ = tag `seq` timeStamp `seq`
+ do driftTo ExaminingRequest
method <- getMethod
when (method == GET || method == HEAD)
- $ setHeader' "Last-Modified" $ formatHTTPDateTime timeStamp
+ $ setHeader' "Last-Modified" $! formatHTTPDateTime timeStamp
+ when (method == POST)
+ $ abort InternalServerError []
+ (Just "Illegal computation of foundEntity for POST request.")
foundETag tag
driftTo GettingBody
-
+-- |Tell the system that the 'Resource' found an entity for the
+-- request URI. The only difference from 'foundEntity' is that
+-- 'foundETag' doesn't (and can't) put \"Last-Modified\" header into
+-- the response.
+--
+-- This action is not preferred. You should use 'foundEntity' whenever
+-- possible.
foundETag :: ETag -> Resource ()
foundETag tag
- = do driftTo ExaminingRequest
+ = tag `seq`
+ do driftTo ExaminingRequest
method <- getMethod
when (method == GET || method == HEAD)
- $ setHeader' "ETag" $ show tag
+ $ setHeader' "ETag" $! show tag
+ when (method == POST)
+ $ abort InternalServerError []
+ (Just "Illegal computation of foundETag for POST request.")
-- If-Match があればそれを見る。
ifMatch <- getHeader "If-Match"
Nothing -> return ()
Just "*" -> return ()
Just list -> case parseStr eTagListP list of
- (Success tags, _)
+ (# Success tags, _ #)
-- tags の中に一致するものが無ければ
-- PreconditionFailed で終了。
-> when (not $ any (== tag) tags)
$ abort PreconditionFailed []
- $ Just ("The entity tag doesn't match: " ++ list)
- _ -> abort BadRequest [] $ Just ("Unparsable If-Match: " ++ fromJust ifMatch)
+ $! Just ("The entity tag doesn't match: " ++ list)
+ (# _, _ #)
+ -> abort BadRequest [] $! Just ("Unparsable If-Match: " ++ fromJust ifMatch)
let statusForNoneMatch = if method == GET || method == HEAD then
NotModified
ifNoneMatch <- getHeader "If-None-Match"
case ifNoneMatch of
Nothing -> return ()
- Just "*" -> abort statusForNoneMatch [] $ Just ("The entity tag matches: *")
+ Just "*" -> abort statusForNoneMatch [] $! Just ("The entity tag matches: *")
Just list -> case parseStr eTagListP list of
- (Success tags, _)
+ (# Success tags, _ #)
-> when (any (== tag) tags)
- $ abort statusForNoneMatch [] $ Just ("The entity tag matches: " ++ list)
- _ -> abort BadRequest [] $ Just ("Unparsable If-None-Match: " ++ list)
+ $ abort statusForNoneMatch [] $! Just ("The entity tag matches: " ++ list)
+ (# _, _ #)
+ -> abort BadRequest [] $! Just ("Unparsable If-None-Match: " ++ list)
driftTo GettingBody
-
+-- |Tell the system that the 'Resource' found an entity for the
+-- request URI. The only difference from 'foundEntity' is that
+-- 'foundTimeStamp' performs \"If-Modified-Since\" test or
+-- \"If-Unmodified-Since\" test instead of \"If-Match\" test or
+-- \"If-None-Match\" test. Be aware that any tests based on last
+-- modification time are unsafe because it is possible to mess up such
+-- tests by modifying the entity twice in a second.
+--
+-- This action is not preferred. You should use 'foundEntity' whenever
+-- possible.
foundTimeStamp :: ClockTime -> Resource ()
foundTimeStamp timeStamp
- = do driftTo ExaminingRequest
+ = timeStamp `seq`
+ do driftTo ExaminingRequest
method <- getMethod
when (method == GET || method == HEAD)
- $ setHeader' "Last-Modified" $ formatHTTPDateTime timeStamp
+ $ setHeader' "Last-Modified" $! formatHTTPDateTime timeStamp
+ when (method == POST)
+ $ abort InternalServerError []
+ (Just "Illegal computation of foundTimeStamp for POST request.")
let statusForIfModSince = if method == GET || method == HEAD then
NotModified
Just lastTime
-> when (timeStamp <= lastTime)
$ abort statusForIfModSince []
- $ Just ("The entity has not been modified since " ++ str)
+ $! Just ("The entity has not been modified since " ++ str)
Nothing
-> return () -- 不正な時刻は無視
Nothing -> return ()
Just lastTime
-> when (timeStamp > lastTime)
$ abort PreconditionFailed []
- $ Just ("The entity has not been modified since " ++ str)
+ $! Just ("The entity has not been modified since " ++ str)
Nothing
-> return () -- 不正な時刻は無視
Nothing -> return ()
driftTo GettingBody
-
+-- | Computation of @'foundNoEntity' mStr@ tells the system that the
+-- 'Resource' found no entity for the request URI. @mStr@ is an
+-- optional error message to be replied to the client.
+--
+-- If this is a PUT request, 'foundNoEntity' performs \"If-Match\"
+-- test and aborts with status \"412 Precondition Failed\" when it
+-- failed. If this is a GET, HEAD, POST or DELETE request,
+-- 'foundNoEntity' always aborts with status \"404 Not Found\".
foundNoEntity :: Maybe String -> Resource ()
foundNoEntity msgM
- = do driftTo ExaminingRequest
+ = msgM `seq`
+ do driftTo ExaminingRequest
method <- getMethod
when (method /= PUT)
- $ abort NotFound [] msgM
+ $ abort NotFound [] msgM
-- エンティティが存在しないと云ふ事は、"*" も含めたどのやうな
-- If-Match: 條件も滿たさない。
{- GettingBody 時に使用するアクション群 -}
+-- | Computation of @'input' limit@ attempts to read the request body
+-- up to @limit@ bytes, and then make the 'Resource' transit to
+-- /Deciding Header/ state. When the actual size of body is larger
+-- than @limit@ bytes, computation of 'Resource' immediately aborts
+-- with status \"413 Request Entity Too Large\". When the request has
+-- no body, 'input' returns an empty string.
+--
+-- @limit@ may be less than or equal to zero. In this case, the
+-- default limitation value
+-- ('Network.HTTP.Lucu.Config.cnfMaxEntityLength') is used. See
+-- 'defaultLimit'.
+--
+-- Note that 'inputLBS' is more efficient than 'input' so you should
+-- use it whenever possible.
input :: Int -> Resource String
-input limit = inputBS limit >>= return . B.unpack
-
-
--- 多くとも limit バイトまでのリクエストボディ全體を受信する。limit が
--- 零以下なら Config で設定されたデフォルトのボディ長により制限される。
-inputBS :: Int -> Resource ByteString
-inputBS limit
- = do driftTo GettingBody
- itr <- ask
- hasBody <- liftIO $ atomically $ readItr itr itrRequestHasBody id
+input limit = limit `seq`
+ inputLBS limit >>= return . B.unpack
+
+
+-- | This is mostly the same as 'input' but is more
+-- efficient. 'inputLBS' returns a
+-- 'Data.ByteString.Base.LazyByteString' but it's not really lazy:
+-- reading from the socket just happens at the computation of
+-- 'inputLBS', not at the evaluation of the
+-- 'Data.ByteString.Base.LazyByteString'. The same goes for
+-- 'inputChunkLBS'.
+inputLBS :: Int -> Resource LazyByteString
+inputLBS limit
+ = limit `seq`
+ do driftTo GettingBody
+ itr <- getInteraction
+ hasBody <- liftIO $! atomically $! readItr itr itrRequestHasBody id
chunk <- if hasBody then
askForInput itr
else
return B.empty
return chunk
where
- askForInput :: Interaction -> Resource ByteString
+ askForInput :: Interaction -> Resource LazyByteString
askForInput itr
- = do let defaultLimit = cnfMaxEntityLength $ itrConfig itr
+ = itr `seq`
+ do let defaultLimit = cnfMaxEntityLength $ itrConfig itr
actualLimit = if limit <= 0 then
defaultLimit
else
limit
when (actualLimit <= 0)
- $ fail ("inputBS: limit must be positive: " ++ show actualLimit)
+ $ fail ("inputLBS: limit must be positive: " ++ show actualLimit)
-- Reader にリクエスト
- liftIO $ atomically
- $ do chunkLen <- readItr itr itrReqChunkLength id
- writeItr itr itrWillReceiveBody True
- if fmap (> actualLimit) chunkLen == Just True then
- -- 受信前から多過ぎる事が分かってゐる
- tooLarge actualLimit
- else
- writeItr itr itrReqBodyWanted $ Just actualLimit
+ liftIO $! atomically
+ $! do chunkLen <- readItr itr itrReqChunkLength id
+ writeItr itr itrWillReceiveBody True
+ if fmap (> actualLimit) chunkLen == Just True then
+ -- 受信前から多過ぎる事が分かってゐる
+ tooLarge actualLimit
+ else
+ writeItr itr itrReqBodyWanted $ Just actualLimit
-- 應答を待つ。トランザクションを分けなければ當然デッドロック。
- chunk <- liftIO $ atomically
- $ do chunk <- readItr itr itrReceivedBody id
- chunkIsOver <- readItr itr itrReqChunkIsOver id
- if B.length chunk < fromIntegral actualLimit then
- -- 要求された量に滿たなくて、まだ殘り
- -- があるなら再試行。
- unless chunkIsOver
- $ retry
- else
- -- 制限値一杯まで讀むやうに指示したの
- -- にまだ殘ってゐるなら、それは多過ぎ
- -- る。
- unless chunkIsOver
- $ tooLarge actualLimit
- -- 成功。itr 内にチャンクを置いたままにす
- -- るとメモリの無駄になるので除去。
- writeItr itr itrReceivedBody B.empty
- return chunk
+ chunk <- liftIO $! atomically
+ $! do chunk <- readItr itr itrReceivedBody id
+ chunkIsOver <- readItr itr itrReqChunkIsOver id
+ if B.length chunk < fromIntegral actualLimit then
+ -- 要求された量に滿たなくて、まだ殘り
+ -- があるなら再試行。
+ unless chunkIsOver
+ $ retry
+ else
+ -- 制限値一杯まで讀むやうに指示したの
+ -- にまだ殘ってゐるなら、それは多過ぎ
+ -- る。
+ unless chunkIsOver
+ $ tooLarge actualLimit
+ -- 成功。itr 内にチャンクを置いたままにす
+ -- るとメモリの無駄になるので除去。
+ writeItr itr itrReceivedBody B.empty
+ return chunk
driftTo DecidingHeader
return chunk
tooLarge :: Int -> STM ()
- tooLarge lim = abortSTM RequestEntityTooLarge []
- $ Just ("Request body must be smaller than "
- ++ show lim ++ " bytes.")
+ tooLarge lim = lim `seq`
+ abortSTM RequestEntityTooLarge []
+ $! Just ("Request body must be smaller than "
+ ++ show lim ++ " bytes.")
-
+-- | Computation of @'inputChunk' limit@ attempts to read a part of
+-- request body up to @limit@ bytes. You can read any large request by
+-- repeating computation of this action. When you've read all the
+-- request body, 'inputChunk' returns an empty string and then make
+-- the 'Resource' transit to /Deciding Header/ state.
+--
+-- @limit@ may be less than or equal to zero. In this case, the
+-- default limitation value
+-- ('Network.HTTP.Lucu.Config.cnfMaxEntityLength') is used. See
+-- 'defaultLimit'.
+--
+-- Note that 'inputChunkLBS' is more efficient than 'inputChunk' so you
+-- should use it whenever possible.
inputChunk :: Int -> Resource String
-inputChunk limit = inputChunkBS limit >>= return . B.unpack
+inputChunk limit = limit `seq`
+ inputChunkLBS limit >>= return . B.unpack
--- 多くとも limit バイトまでのリクエストボディの一部を受信する。limit
--- が 0 以下なら Config で設定されたデフォルトのボディ長により制限され
--- る。これ以上ボディが殘ってゐなければ空文字列を返す。
-inputChunkBS :: Int -> Resource ByteString
-inputChunkBS limit
- = do driftTo GettingBody
- itr <- ask
+-- | This is mostly the same as 'inputChunk' but is more
+-- efficient. See 'inputLBS'.
+inputChunkLBS :: Int -> Resource LazyByteString
+inputChunkLBS limit
+ = limit `seq`
+ do driftTo GettingBody
+ itr <- getInteraction
hasBody <- liftIO $ atomically $ readItr itr itrRequestHasBody id
chunk <- if hasBody then
askForInput itr
return B.empty
return chunk
where
- askForInput :: Interaction -> Resource ByteString
+ askForInput :: Interaction -> Resource LazyByteString
askForInput itr
- = do let defaultLimit = cnfMaxEntityLength $ itrConfig itr
+ = itr `seq`
+ do let defaultLimit = cnfMaxEntityLength $! itrConfig itr
actualLimit = if limit < 0 then
defaultLimit
else
limit
when (actualLimit <= 0)
- $ fail ("inputChunkBS: limit must be positive: " ++ show actualLimit)
+ $ fail ("inputChunkLBS: limit must be positive: " ++ show actualLimit)
-- Reader にリクエスト
- liftIO $ atomically
- $ do writeItr itr itrReqBodyWanted $ Just actualLimit
- writeItr itr itrWillReceiveBody True
+ liftIO $! atomically
+ $! do writeItr itr itrReqBodyWanted $! Just actualLimit
+ writeItr itr itrWillReceiveBody True
-- 應答を待つ。トランザクションを分けなければ當然デッドロック。
- chunk <- liftIO $ atomically
+ chunk <- liftIO $! atomically
$ do chunk <- readItr itr itrReceivedBody id
-- 要求された量に滿たなくて、まだ殘りがあ
-- るなら再試行。
$ driftTo DecidingHeader
return chunk
+-- | Computation of @'inputForm' limit@ attempts to read the request
+-- body with 'input' and parse it as
+-- application\/x-www-form-urlencoded. If the request header
+-- \"Content-Type\" is not application\/x-www-form-urlencoded,
+-- 'inputForm' makes 'Resource' abort with status \"415 Unsupported
+-- Media Type\". If the request has no \"Content-Type\", it aborts
+-- with \"400 Bad Request\".
+--
+-- This action should also support multipart\/form-data somehow, but
+-- it is not (yet) done.
+inputForm :: Int -> Resource [(String, String)]
+inputForm limit
+ = limit `seq`
+ do cTypeM <- getContentType
+ case cTypeM of
+ Nothing
+ -> abort BadRequest [] (Just "Missing Content-Type")
+ Just (MIMEType "application" "x-www-form-urlencoded" _)
+ -> readWWWFormURLEncoded
+ Just (MIMEType "multipart" "form-data" _)
+ -> readMultipartFormData
+ Just cType
+ -> abort UnsupportedMediaType [] (Just $! "Unsupported media type: "
+ ++ show cType)
+ where
+ readWWWFormURLEncoded
+ = do src <- input limit
+ return $ parseWWWFormURLEncoded src
+
+ readMultipartFormData -- FIXME: 未對應
+ = abort UnsupportedMediaType []
+ (Just $! "Sorry, inputForm does not currently support multipart/form-data.")
+-- | This is just a constant @-1@. It's better to say @'input'
+-- 'defaultLimit'@ than to say @'input' (-1)@ but these are exactly
+-- the same.
defaultLimit :: Int
defaultLimit = (-1)
{- DecidingHeader 時に使用するアクション群 -}
+-- | Set the response status code. If you omit to compute this action,
+-- the status code will be defaulted to \"200 OK\".
setStatus :: StatusCode -> Resource ()
setStatus code
- = do driftTo DecidingHeader
- itr <- ask
- liftIO $ atomically $ updateItr itr itrResponse
- $ \ resM -> case resM of
- Nothing -> Just $ Response {
- resVersion = HttpVersion 1 1
- , resStatus = code
- , resHeaders = []
- }
- Just res -> Just $ res {
- resStatus = code
- }
-
-
+ = code `seq`
+ do driftTo DecidingHeader
+ itr <- getInteraction
+ liftIO $! atomically $! updateItr itr itrResponse
+ $! \ res -> res {
+ resStatus = code
+ }
+
+-- | Set a value of given resource header. Comparison of header name
+-- is case-insensitive. Note that this action is not intended to be
+-- used so frequently: there should be actions like 'setContentType'
+-- for every common headers.
+--
+-- Some important headers (especially \"Content-Length\" and
+-- \"Transfer-Encoding\") may be silently dropped or overwritten by
+-- the system not to corrupt the interaction with client at the
+-- viewpoint of HTTP protocol layer. For instance, if we are keeping
+-- the connection alive, without this process it causes a catastrophe
+-- to send a header \"Content-Length: 10\" and actually send a body of
+-- 20 bytes long. In this case the client shall only accept the first
+-- 10 bytes of response body and thinks that the residual 10 bytes is
+-- a part of header of the next response.
setHeader :: String -> String -> Resource ()
setHeader name value
- = driftTo DecidingHeader >> setHeader' name value
+ = name `seq` value `seq`
+ driftTo DecidingHeader >> setHeader' name value
-setHeader' :: String -> String -> Resource()
+setHeader' :: String -> String -> Resource ()
setHeader' name value
- = do itr <- ask
- liftIO $ atomically $ updateItr itr itrResponse
- $ \ resM -> case resM of
- Nothing -> Just $ Response {
- resVersion = HttpVersion 1 1
- , resStatus = Ok
- , resHeaders = [ (name, value) ]
- }
- Just res -> Just $ H.setHeader name value res
-
-
+ = name `seq` value `seq`
+ do itr <- getInteraction
+ liftIO $ atomically
+ $ updateItr itr itrResponse
+ $ H.setHeader name value
+
+-- | Computation of @'redirect' code uri@ sets the response status to
+-- @code@ and \"Location\" header to @uri@. The @code@ must satisfy
+-- 'Network.HTTP.Lucu.Response.isRedirection' or it causes an error.
redirect :: StatusCode -> URI -> Resource ()
redirect code uri
- = do when (code == NotModified || not (isRedirection code))
+ = code `seq` uri `seq`
+ do when (code == NotModified || not (isRedirection code))
$ abort InternalServerError []
- $ Just ("Attempted to redirect with status " ++ show code)
+ $! Just ("Attempted to redirect with status " ++ show code)
setStatus code
- setHeader "Location" (uriToString id uri $ "")
-
-
-setETag :: ETag -> Resource ()
-setETag tag
- = setHeader "ETag" $ show tag
-
-
-setLastModified :: ClockTime -> Resource ()
-setLastModified lastmod
- = setHeader "Last-Modified" $ formatHTTPDateTime lastmod
+ setLocation uri
+{-# INLINE redirect #-}
+-- | Computation of @'setContentType' mType@ sets the response header
+-- \"Content-Type\" to @mType@.
setContentType :: MIMEType -> Resource ()
setContentType mType
- = setHeader "Content-Type" $ show mType
-
-
-{- DecidingBody 時に使用するアクション群 -}
+ = setHeader "Content-Type" $! show mType
-output :: String -> Resource ()
-output = outputBS . B.pack
+-- | Computation of @'setLocation' uri@ sets the response header
+-- \"Location\" to @uri@.
+setLocation :: URI -> Resource ()
+setLocation uri
+ = setHeader "Location" $ uriToString id uri $ ""
+-- |Computation of @'setContentEncoding' codings@ sets the response
+-- header \"Content-Encoding\" to @codings@.
+setContentEncoding :: [String] -> Resource ()
+setContentEncoding codings
+ = do ver <- getRequestVersion
+ let tr = case ver of
+ HttpVersion 1 0 -> unnormalizeCoding
+ HttpVersion 1 1 -> id
+ setHeader "Content-Encoding" $ joinWith ", " $ map tr codings
-outputBS :: ByteString -> Resource ()
-outputBS str = do outputChunkBS str
- driftTo Done
+{- DecidingBody 時に使用するアクション群 -}
+-- | Computation of @'output' str@ writes @str@ as a response body,
+-- and then make the 'Resource' transit to /Done/ state. It is safe to
+-- apply 'output' to an infinite string, such as a lazy stream of
+-- \/dev\/random.
+--
+-- Note that 'outputLBS' is more efficient than 'output' so you should
+-- use it whenever possible.
+output :: String -> Resource ()
+output str = outputLBS $! B.pack str
+{-# INLINE output #-}
+
+-- | This is mostly the same as 'output' but is more efficient.
+outputLBS :: LazyByteString -> Resource ()
+outputLBS str = do outputChunkLBS str
+ driftTo Done
+{-# INLINE outputLBS #-}
+
+-- | Computation of @'outputChunk' str@ writes @str@ as a part of
+-- response body. You can compute this action multiple times to write
+-- a body little at a time. It is safe to apply 'outputChunk' to an
+-- infinite string.
+--
+-- Note that 'outputChunkLBS' is more efficient than 'outputChunk' so
+-- you should use it whenever possible.
outputChunk :: String -> Resource ()
-outputChunk = outputChunkBS . B.pack
-
-
-{- チャンクの大きさは Config で制限されてゐる。もし例へば /dev/zero を
- B.readFile して作った ByteString をそのまま ResponseWriter に渡した
- りすると大變な事が起こる。何故なら ResponseWriter は
- Transfer-Encoding: chunked の時、ヘッダを書く爲にチャンクの大きさを
- 測るから、その時に起こるであらう事は言ふまでも無い。 -}
-
-outputChunkBS :: ByteString -> Resource ()
-outputChunkBS str
- = do driftTo DecidingBody
- itr <- ask
+outputChunk str = outputChunkLBS $! B.pack str
+{-# INLINE outputChunk #-}
+
+-- | This is mostly the same as 'outputChunk' but is more efficient.
+outputChunkLBS :: LazyByteString -> Resource ()
+outputChunkLBS str
+ = str `seq`
+ do driftTo DecidingBody
+ itr <- getInteraction
let limit = cnfMaxOutputChunkLength $ itrConfig itr
when (limit <= 0)
$ liftIO $ atomically $
writeItr itr itrBodyIsNull False
where
- sendChunks :: ByteString -> Int -> Resource ()
+ -- チャンクの大きさは Config で制限されてゐる。もし例へば
+ -- "/dev/zero" を B.readFile して作った LazyByteString をそのまま
+ -- ResponseWriter に渡したりすると大變な事が起こる。何故なら
+ -- ResponseWriter は Transfer-Encoding: chunked の時、ヘッダを書
+ -- く爲にチャンクの大きさを測る。
+ sendChunks :: LazyByteString -> Int -> Resource ()
sendChunks str limit
| B.null str = return ()
| otherwise = do let (chunk, remaining) = B.splitAt (fromIntegral limit) str
- itr <- ask
+ itr <- getInteraction
liftIO $ atomically $
do buf <- readItr itr itrBodyToSend id
if B.null buf then
[Done に遷移する時]
bodyIsNull が False ならば何もしない。True だった場合は出力補完す
- る。Content-Type も變はる。但し（デフォルトのまま）Status が 200 OK
- だった場合は、補完の代はりに 204 No Content に變へる。
+ る。
-}
driftTo :: InteractionState -> Resource ()
driftTo newState
- = do itr <- ask
+ = newState `seq`
+ do itr <- getInteraction
liftIO $ atomically $ do oldState <- readItr itr itrState id
if newState < oldState then
throwStateError oldState newState
drift itr _ Done
= do bodyIsNull <- readItr itr itrBodyIsNull id
when bodyIsNull
- $ do status <- readStatus itr
- if status == Ok then
- do updateItrF itr itrResponse
- $ \ res -> res { resStatus = NoContent }
- updateItrF itr itrResponse
- $ H.deleteHeader "Content-Type"
- updateItrF itr itrResponse
- $ H.deleteHeader "ETag"
- updateItrF itr itrResponse
- $ H.deleteHeader "Last-Modified"
- else
- writeDefaultPage itr
-
+ $ writeDefaultPage itr
drift _ _ _
= return ()
-
-
- readStatus :: Interaction -> STM StatusCode
- readStatus itr = readItr itr itrResponse (resStatus . fromJust)
\ No newline at end of file
projects / Lucu.git / blobdiff