+{-# LANGUAGE
+ DoAndIfThenElse
+ , OverloadedStrings
+ , UnicodeSyntax
+ #-}
{-# OPTIONS_HADDOCK prune #-}
-- | Repository of the resources in httpd.
, ResTree
, FallbackHandler
- , mkResTree -- [ ([String], ResourceDef) ] -> ResTree
+ , mkResTree
- , findResource -- ResTree -> URI -> Maybe ([String], ResourceDef)
- , runResource -- ResourceDef -> Interaction -> IO ThreadId
+ , findResource
+ , runResource
)
where
-
import Control.Arrow
+import Control.Applicative
+import Data.Ascii (Ascii)
+import qualified Data.Ascii as A
import Control.Concurrent
import Control.Concurrent.STM
import Control.Exception
import Control.Monad
-import qualified Data.ByteString.Char8 as C8
+import Data.Text (Text)
+import qualified Data.Text as T
+import qualified Data.Text.Lazy.Encoding as LT
import Data.List
import qualified Data.Map as M
import Data.Map (Map)
import Data.Maybe
+import Data.Monoid.Unicode
import Network.HTTP.Lucu.Abortion
import Network.HTTP.Lucu.Config
-import Network.HTTP.Lucu.Headers (emptyHeaders, fromHeaders)
+import Network.HTTP.Lucu.Headers (fromHeaders)
import Network.HTTP.Lucu.Request
import Network.HTTP.Lucu.Resource
import Network.HTTP.Lucu.Response
import Network.URI hiding (path)
import System.IO
import Prelude hiding (catch)
+import Prelude.Unicode
-- |'FallbackHandler' is an extra resource handler for resources which
--- can't be statically located somewhere in the resource tree. The
--- Lucu httpd first search for a resource in the tree, and then call
+-- can't be statically located anywhere in the resource tree. The Lucu
+-- httpd first searches for a resource in the tree, and then calls
-- fallback handlers to ask them for a resource. If all of the
--- handlers returned 'Prelude.Nothing', the httpd responds with 404
--- Not Found.
-type FallbackHandler = [String] -> IO (Maybe ResourceDef)
+-- handlers returned 'Nothing', the httpd responds with 404 Not Found.
+type FallbackHandler = [Text] → IO (Maybe ResourceDef)
-- "/aaa/bbb/ccc" にアクセスされた時、もし "/aaa/bbb" に貪欲なリソース
-- "/aaa/bbb" が撰ばれる。"/aaa/bbb" のリソースが貪欲でなければ、それは
-- 無視される。
--- | 'ResourceDef' is basically a set of
--- 'Network.HTTP.Lucu.Resource.Resource' monads for each HTTP methods.
+-- | 'ResourceDef' is basically a set of 'Resource' monads for each
+-- HTTP methods.
data ResourceDef = ResourceDef {
- -- |Whether to run a 'Network.HTTP.Lucu.Resource.Resource' on a
- -- native thread (spawned by 'Control.Concurrent.forkOS') or to
- -- run it on a user thread (spanwed by
- -- 'Control.Concurrent.forkIO'). Generally you don't need to set
- -- this field to 'Prelude.True'.
- resUsesNativeThread :: !Bool
+ -- |Whether to run a 'Resource' on a native thread (spawned by
+ -- 'forkOS') or to run it on a user thread (spanwed by
+ -- 'forkIO'). Generally you don't need to set this field to
+ -- 'True'.
+ resUsesNativeThread ∷ !Bool
-- | Whether to be greedy or not.
--
-- Say a client is trying to access \/aaa\/bbb\/ccc. If there is a
-- there is another resource at \/aaa\/bbb\/ccc. If the resource
-- at \/aaa\/bbb is not greedy, it is just ignored. Greedy
-- resources are like CGI scripts.
- , resIsGreedy :: !Bool
- -- | A 'Network.HTTP.Lucu.Resource.Resource' to be run when a GET
- -- request comes for the resource path. If 'resGet' is Nothing,
- -- the system responds \"405 Method Not Allowed\" for GET
- -- requests.
+ , resIsGreedy ∷ !Bool
+ -- | A 'Resource' to be run when a GET request comes for the
+ -- resource path. If 'resGet' is Nothing, the system responds
+ -- \"405 Method Not Allowed\" for GET requests.
--
-- It also runs for HEAD request if the 'resHead' is Nothing. In
- -- this case 'Network.HTTP.Lucu.Resource.output' and such like
- -- don't actually write a response body.
- , resGet :: !(Maybe (Resource ()))
- -- | A 'Network.HTTP.Lucu.Resource.Resource' to be run when a HEAD
- -- request comes for the resource path. If 'resHead' is Nothing,
- -- the system runs 'resGet' instead. If 'resGet' is also Nothing,
- -- the system responds \"405 Method Not Allowed\" for HEAD
- -- requests.
- , resHead :: !(Maybe (Resource ()))
- -- | A 'Network.HTTP.Lucu.Resource.Resource' to be run when a POST
- -- request comes for the resource path. If 'resPost' is Nothing,
- -- the system responds \"405 Method Not Allowed\" for POST
- -- requests.
- , resPost :: !(Maybe (Resource ()))
- -- | A 'Network.HTTP.Lucu.Resource.Resource' to be run when a PUT
- -- request comes for the resource path. If 'resPut' is Nothing,
- -- the system responds \"405 Method Not Allowed\" for PUT
- -- requests.
- , resPut :: !(Maybe (Resource ()))
- -- | A 'Network.HTTP.Lucu.Resource.Resource' to be run when a
- -- DELETE request comes for the resource path. If 'resDelete' is
- -- Nothing, the system responds \"405 Method Not Allowed\" for
- -- DELETE requests.
- , resDelete :: !(Maybe (Resource ()))
+ -- this case 'output' and such like don't actually write a
+ -- response body.
+ , resGet ∷ !(Maybe (Resource ()))
+ -- | A 'Resource' to be run when a HEAD request comes for the
+ -- resource path. If 'resHead' is Nothing, the system runs
+ -- 'resGet' instead. If 'resGet' is also Nothing, the system
+ -- responds \"405 Method Not Allowed\" for HEAD requests.
+ , resHead ∷ !(Maybe (Resource ()))
+ -- | A 'Resource' to be run when a POST request comes for the
+ -- resource path. If 'resPost' is Nothing, the system responds
+ -- \"405 Method Not Allowed\" for POST requests.
+ , resPost ∷ !(Maybe (Resource ()))
+ -- | A 'Resource' to be run when a PUT request comes for the
+ -- resource path. If 'resPut' is Nothing, the system responds
+ -- \"405 Method Not Allowed\" for PUT requests.
+ , resPut ∷ !(Maybe (Resource ()))
+ -- | A 'Resource' to be run when a DELETE request comes for the
+ -- resource path. If 'resDelete' is Nothing, the system responds
+ -- \"405 Method Not Allowed\" for DELETE requests.
+ , resDelete ∷ !(Maybe (Resource ()))
}
-- |'emptyResource' is a resource definition with no actual
-- , resDelete = Nothing
-- }
-- @
-emptyResource :: ResourceDef
+emptyResource ∷ ResourceDef
emptyResource = ResourceDef {
resUsesNativeThread = False
, resIsGreedy = False
-- |'ResTree' is an opaque structure which is a map from resource path
-- to 'ResourceDef'.
newtype ResTree = ResTree ResNode -- root だから Map ではない
-type ResSubtree = Map String ResNode
+type ResSubtree = Map Text ResNode
data ResNode = ResNode (Maybe ResourceDef) ResSubtree
-- |'mkResTree' converts a list of @(path, def)@ to a 'ResTree' e.g.
-- , ([\"unistd\"], 'Network.HTTP.Lucu.StaticFile.staticFile' \"\/usr\/include\/unistd.h\") -- \/unistd
-- ]
-- @
-mkResTree :: [ ([String], ResourceDef) ] -> ResTree
+mkResTree ∷ [ ([Text], ResourceDef) ] → ResTree
mkResTree = processRoot . map (first canonicalisePath)
where
- canonicalisePath :: [String] -> [String]
- canonicalisePath = filter (/= "")
+ canonicalisePath ∷ [Text] → [Text]
+ canonicalisePath = filter (≢ "")
- processRoot :: [ ([String], ResourceDef) ] -> ResTree
+ processRoot ∷ [ ([Text], ResourceDef) ] → ResTree
processRoot list
- = let (roots, nonRoots) = partition (\ (path, _) -> path == []) list
+ = let (roots, nonRoots) = partition (\ (path, _) → path == []) list
children = processNonRoot nonRoots
in
if null roots then
in
ResTree (ResNode (Just def) children)
- processNonRoot :: [ ([String], ResourceDef) ] -> ResSubtree
+ processNonRoot ∷ [ ([Text], ResourceDef) ] → ResSubtree
processNonRoot list
= let subtree = M.fromList [(name, node name)
- | name <- childNames]
- childNames = [name | (name:_, _) <- list]
- node name = let defs = [def | (path, def) <- list, path == [name]]
+ | name ← childNames]
+ childNames = [name | (name:_, _) ← list]
+ node name = let defs = [def | (path, def) ← list, path == [name]]
in
if null defs then
-- No resources are defined
-- There is a resource here.
ResNode (Just $ last defs) children
children = processNonRoot [(path, def)
- | (_:path, def) <- list]
+ | (_:path, def) ← list]
in
subtree
-findResource :: ResTree -> [FallbackHandler] -> URI -> IO (Maybe ([String], ResourceDef))
+findResource ∷ ResTree → [FallbackHandler] → URI → IO (Maybe ([Text], ResourceDef))
findResource (ResTree (ResNode rootDefM subtree)) fbs uri
- = do let pathStr = uriPath uri
- path = [unEscapeString x | x <- splitBy (== '/') pathStr, x /= ""]
+ = do let path = splitPathInfo uri
haveGreedyRoot = case rootDefM of
- Just def -> resIsGreedy def
- Nothing -> False
- foundInTree = if haveGreedyRoot || null path then
- do def <- rootDefM
+ Just def → resIsGreedy def
+ Nothing → False
+ foundInTree = if haveGreedyRoot ∨ null path then
+ do def ← rootDefM
return ([], def)
else
walkTree subtree path []
if isJust foundInTree then
return foundInTree
- else
+ else
fallback path fbs
where
- walkTree :: ResSubtree -> [String] -> [String] -> Maybe ([String], ResourceDef)
+ walkTree ∷ ResSubtree → [Text] → [Text] → Maybe ([Text], ResourceDef)
walkTree _ [] _
= error "Internal error: should not reach here."
walkTree tree (name:[]) soFar
= case M.lookup name tree of
- Nothing -> Nothing
- Just (ResNode defM _) -> do def <- defM
- return (soFar ++ [name], def)
+ Nothing → Nothing
+ Just (ResNode defM _) → do def ← defM
+ return (soFar ⧺ [name], def)
walkTree tree (x:xs) soFar
= case M.lookup x tree of
- Nothing -> Nothing
- Just (ResNode defM children) -> case defM of
+ Nothing → Nothing
+ Just (ResNode defM children) → case defM of
Just (ResourceDef { resIsGreedy = True })
- -> do def <- defM
- return (soFar ++ [x], def)
- _ -> walkTree children xs (soFar ++ [x])
+ → do def ← defM
+ return (soFar ++ [x], def)
+ _ → walkTree children xs (soFar ++ [x])
- fallback :: [String] -> [FallbackHandler] -> IO (Maybe ([String], ResourceDef))
+ fallback ∷ [Text] → [FallbackHandler] → IO (Maybe ([Text], ResourceDef))
fallback _ [] = return Nothing
- fallback path (x:xs) = do m <- x path
+ fallback path (x:xs) = do m ← x path
case m of
- Just def -> return $! Just ([], def)
- Nothing -> fallback path xs
+ Just def → return $! Just ([], def)
+ Nothing → fallback path xs
-runResource :: ResourceDef -> Interaction -> IO ThreadId
+runResource ∷ ResourceDef → Interaction → IO ThreadId
runResource def itr
= def `seq` itr `seq`
fork
- $! catch ( runRes ( do req <- getRequest
+ $! catch ( runRes ( do req ← getRequest
fromMaybe notAllowed $ rsrc req
driftTo Done
) itr
)
processException
where
- fork :: IO () -> IO ThreadId
+ fork ∷ IO () → IO ThreadId
fork = if resUsesNativeThread def
then forkOS
else forkIO
- rsrc :: Request -> Maybe (Resource ())
+ rsrc ∷ Request → Maybe (Resource ())
rsrc req
= case reqMethod req of
- GET -> resGet def
- HEAD -> case resHead def of
- Just r -> Just r
- Nothing -> resGet def
- POST -> resPost def
- PUT -> resPut def
- DELETE -> resDelete def
- _ -> undefined
+ GET → resGet def
+ HEAD → case resHead def of
+ Just r → Just r
+ Nothing → resGet def
+ POST → resPost def
+ PUT → resPut def
+ DELETE → resDelete def
+ _ → undefined
- notAllowed :: Resource ()
- notAllowed = do setStatus MethodNotAllowed
- setHeader (C8.pack "Allow") (C8.pack $ joinWith ", " allowedMethods)
+ notAllowed ∷ Resource ()
+ notAllowed
+ = setStatus MethodNotAllowed
+ *>
+ (setHeader "Allow" $ A.fromAsciiBuilder
+ $ joinWith ", "
+ $ map A.toAsciiBuilder allowedMethods)
- allowedMethods :: [String]
+ allowedMethods ∷ [Ascii]
allowedMethods = nub $ concat [ methods resGet ["GET"]
, methods resHead ["GET", "HEAD"]
, methods resPost ["POST"]
, methods resDelete ["DELETE"]
]
- methods :: (ResourceDef -> Maybe a) -> [String] -> [String]
+ methods ∷ (ResourceDef → Maybe a) → [Ascii] → [Ascii]
methods f xs = case f def of
- Just _ -> xs
- Nothing -> []
+ Just _ → xs
+ Nothing → []
- toAbortion :: SomeException -> Abortion
- toAbortion e = case fromException e of
- Just abortion -> abortion
- Nothing -> Abortion InternalServerError emptyHeaders (Just (show e))
+ toAbortion ∷ SomeException → Abortion
+ toAbortion e
+ = case fromException e of
+ Just abortion → abortion
+ Nothing → Abortion InternalServerError (∅) (Just $ T.pack $ show e)
- processException :: SomeException -> IO ()
+ processException ∷ SomeException → IO ()
processException exc
= do let abo = toAbortion exc
conf = itrConfig itr
-- まだ DecidingHeader 以前の状態だったら、この途中終了
-- を應答に反映させる餘地がある。さうでなければ stderr
-- にでも吐くしか無い。
- state <- atomically $ readItr itr itrState id
- reqM <- atomically $ readItr itr itrRequest id
- res <- atomically $ readItr itr itrResponse id
- if state <= DecidingHeader then
+ state ← atomically $ readItr itrState id itr
+ reqM ← atomically $ readItr itrRequest id itr
+ res ← atomically $ readItr itrResponse id itr
+ if state ≤ DecidingHeader then
flip runRes itr
$ do setStatus $ aboStatus abo
mapM_ (uncurry setHeader) $ fromHeaders $ aboHeaders abo
- output $ abortPage conf reqM res abo
+ output $ LT.encodeUtf8 $ abortPage conf reqM res abo
else
when (cnfDumpTooLateAbortionToStderr $ itrConfig itr)
$ hPutStrLn stderr $ show abo
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