Documentation

[Lucu.git] / Network / HTTP / Lucu / Resource / Tree.hs

diff --git a/Network/HTTP/Lucu/Resource/Tree.hs b/Network/HTTP/Lucu/Resource/Tree.hs
index 6fc49d477891adfd16b80f37466f21d6d865d6f3..4ed161fafc39c41ed0ed324100042430b674f8a2 100644 (file)
--- a/Network/HTTP/Lucu/Resource/Tree.hs
+++ b/Network/HTTP/Lucu/Resource/Tree.hs
@@ -1,6 +1,8 @@
+-- #prune
+
+-- | Repository of the resources in httpd.
 module Network.HTTP.Lucu.Resource.Tree
     ( ResourceDef(..)
-    , Resource
     , ResTree
     , mkResTree    -- [ ([String], ResourceDef) ] -> ResTree
 
@@ -32,24 +34,71 @@ import           System.IO.Error hiding (catch)
 import           Prelude hiding (catch)
 
 
-{- /aaa/bbb/ccc にアクセスされた時、もし /aaa/bbb に貪欲なリソースがあ
-   れば、假に /aaa/bbb/ccc に何らかのリソースがあったとしても必ず
-   /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。 -}
+-- "/aaa/bbb/ccc" にアクセスされた時、もし "/aaa/bbb" に貪欲なリソース
+-- があれば、假に "/aaa/bbb/ccc" に何らかのリソースがあったとしても必ず
+-- "/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.
 data ResourceDef = ResourceDef {
+    -- | Whether to run a 'Network.HTTP.Lucu.Resource.Resource' on a
+    -- native thread (spawned using @forkOS@) or to run it on a user
+    -- thread (spanwed using @forkIO@). Generally you don't
       resUsesNativeThread :: Bool
+    -- | Whether to be greedy or not.
+    -- 
+    -- Say a client is trying to access \/aaa\/bbb\/ccc. If there is a
+    -- greedy resource at \/aaa\/bbb, it is always chosen even if
+    -- there is another resource at \/aaa\/bbb\/ccc. If the resource
+    -- at \/aaa\/bbb is not greedy, it is just ignored. Greedy
+    -- resource is like a CGI script.
     , 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.
+    -- 
+    -- 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 ())
     }
+
+-- | 'ResTree' is an opaque structure which is a map from resource
+-- path to 'ResourceDef'.
 type ResTree    = ResNode -- root だから Map ではない
 type ResSubtree = Map String ResNode
 data ResNode    = ResNode (Maybe ResourceDef) ResSubtree
 
-
+-- | 'mkResTree' converts a list of @(path, def)@ to a 'ResTree' e.g.
+--
+-- @
+--   mkResTree [ ([]        , 'Network.HTTP.Lucu.StaticFile.staticFile' \"\/usr\/include\/stdio.h\" ) -- \/
+--             , ([\"unistd\"], 'Network.HTTP.Lucu.StaticFile.staticFile' \"\/usr\/include\/unistd.h\") -- \/unistd
+--             ]
+-- @
 mkResTree :: [ ([String], ResourceDef) ] -> ResTree
 mkResTree list = processRoot list
     where
@@ -59,10 +108,10 @@ mkResTree list = processRoot list
                 children = processNonRoot nonRoots
             in
               if null roots then
-                  -- / にリソースが定義されない。/foo とかにはあるかも。
+                  -- "/" にリソースが定義されない。"/foo" とかにはあるかも。
                   ResNode Nothing children
               else
-                  -- / がある。
+                  -- "/" がある。
                   let (_, def) = last roots
                   in 
                     ResNode (Just def) children
@@ -174,17 +223,17 @@ runResource def itr
                -- 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
-               resM  <- atomically $ readItr itr itrResponse id
+               res   <- atomically $ readItr itr itrResponse id
                if state <= DecidingHeader then
                    flip runReaderT itr
                       $ do setStatus $ aboStatus abo
                            -- FIXME: 同じ名前で複數の値があった時は、こ
                            -- れではまずいと思ふ。
                            mapM_ (\ (name, value) -> setHeader name value) $ aboHeaders abo
-                           setContentType ("application" +/+ "xhtml+xml")
-                           output $ abortPage conf reqM resM abo
+                           output $ abortPage conf reqM res abo
                  else
-                   hPutStrLn stderr $ show abo
+                   when (cnfDumpTooLateAbortionToStderr $ itrConfig itr)
+                            $ hPutStrLn stderr $ show abo
 
                flip runReaderT itr $ driftTo Done