hlint

[Lucu.git] / Network / HTTP / Lucu / Httpd.hs

diff --git a/Network/HTTP/Lucu/Httpd.hs b/Network/HTTP/Lucu/Httpd.hs
index 2be87368b4b436d2d16c8e0c43b044b69ecdda67..a5f974978a4c6e5ccc4baad408d61bd5ce69f661 100644 (file)
--- a/Network/HTTP/Lucu/Httpd.hs
+++ b/Network/HTTP/Lucu/Httpd.hs
@@ -1,32 +1,118 @@
+{-# LANGUAGE
+    CPP
+  , UnicodeSyntax
+  #-}
+-- |The entry point of Lucu httpd.
 module Network.HTTP.Lucu.Httpd
-    ( runHttpd        -- Config -> ResTree -> IO ()
+    ( runHttpd
     )
     where
+import Control.Concurrent
+import Control.Exception
+import Control.Monad
+import Control.Monad.Unicode
+import Data.Maybe
+import Network.BSD
+import Network.Socket
+import Network.HTTP.Lucu.Config
+import Network.HTTP.Lucu.Dispatcher
+import Network.HTTP.Lucu.Interaction
+import Network.HTTP.Lucu.RequestReader
+import Network.HTTP.Lucu.ResponseWriter
+import Network.HTTP.Lucu.SocketLike as SL
+import Prelude.Unicode
 
-import           Control.Concurrent
-import           Control.Concurrent.STM
-import qualified Data.ByteString.Lazy.Char8 as B
-import           Data.ByteString.Lazy.Char8 (ByteString)
-import           Network
-import           Network.HTTP.Lucu.Config
-import           Network.HTTP.Lucu.Interaction
-import           Network.HTTP.Lucu.RequestReader
-import           Network.HTTP.Lucu.Resource
-import           Network.HTTP.Lucu.Resource.Tree
-import           Network.HTTP.Lucu.ResponseWriter
-import           System.IO
+-- |This is the entry point of Lucu httpd. It listens to a socket and
+-- waits for clients. 'runHttpd' never stops by itself so the only way
+-- to stop it is to raise an exception in the thread running it.
+--
+-- Example:
+--
+-- @
+--   {-\# LANGUAGE OverloadedStrings \#-}
+--   {-\# LANGUAGE QuasiQuotes \#-}
+--   module Main where
+--   import qualified "Data.Collections" as C
+--   import "Network"
+--   import "Network.HTTP.Lucu"
+--
+--   main :: 'IO' ()
+--   main = let config = 'defaultConfig'
+--              tree   :: 'ResourceTree'
+--              tree   = C.fromList [ ([], 'nonGreedy' helloWorld) ]
+--          in
+--            'Network.withSocketsDo' '.' 'runHttpd' config '$' 'resourceMap' tree
+--
+--   helloWorld :: 'Network.HTTP.Lucu.Resource'
+--   helloWorld = C.fromList
+--                [ ( 'Network.HTTP.Lucu.GET'
+--                  , do 'Network.HTTP.Lucu.setContentType' ['Network.HTTP.Lucu.mimeType'| text/plain |]
+--                       'Network.HTTP.Lucu.putChunk' \"Hello, world!\"
+--                }
+-- @
+runHttpd ∷ HostMapper α ⇒ Config → α → IO ()
+runHttpd cnf hm
+    = do let launchers
+                 = catMaybes
+                   [ do addr ← cnfServerV4Addr cnf
+                        return ( launchListener =≪ listenOn AF_INET addr (cnfServerPort cnf)
+                               )
+                   , do addr ← cnfServerV6Addr cnf
+                        return ( launchListener =≪ listenOn AF_INET6 addr (cnfServerPort cnf)
+                               )
+#if defined(HAVE_SSL)
+                   , do scnf ← cnfSSLConfig    cnf
+                        addr ← cnfServerV4Addr cnf
+                        return ( do so ← listenOn AF_INET addr (sslServerPort scnf)
+                                    launchListener (sslContext scnf, so)
+                               )
+                   , do scnf ← cnfSSLConfig    cnf
+                        addr ← cnfServerV6Addr cnf
+                        return ( do so ← listenOn AF_INET6 addr (sslServerPort scnf)
+                                    launchListener (sslContext scnf, so)
+                               )
+#endif
+                   ]
+         sequence_ launchers
+         waitForever
+    where
+      launchListener ∷ SocketLike s ⇒ s → IO ()
+      launchListener so
+          = do p ← SL.socketPort so
+               -- FIXME: Don't throw away the thread ID as we can't
+               -- kill it later then.
+               void ∘ forkIO $ httpLoop p so
 
+      listenOn ∷ Family → HostName → ServiceName → IO Socket
+      listenOn fam host srv
+          = do proto ← getProtocolNumber "tcp"
+               let hints = defaultHints {
+                             addrFlags      = [AI_PASSIVE]
+                           , addrFamily     = fam
+                           , addrSocketType = Stream
+                           , addrProtocol   = proto
+                           }
+               addrs ← getAddrInfo (Just hints) (Just host) (Just srv)
+               let addr = head addrs
+               bracketOnError
+                   (socket (addrFamily     addr)
+                           (addrSocketType addr)
+                           (addrProtocol   addr))
+                   sClose
+                   (\ sock →
+                        do setSocketOption sock ReuseAddr 1
+                           bindSocket sock (addrAddress addr)
+                           listen sock maxListenQueue
+                           return sock
+                   )
 
-runHttpd :: Config -> ResTree -> IO ()
-runHttpd cnf table
-    = withSocketsDo $
-      do so <- listenOn (cnfServerPort cnf)
-         loop so
-    where
-      loop :: Socket -> IO ()
-      loop so
-          = do (h, host, _) <- accept so
-               tQueue       <- newInteractionQueue
-               readerTID    <- forkIO $ requestReader cnf table h host tQueue
-               writerTID    <- forkIO $ responseWriter cnf h tQueue readerTID
-               loop so
+      httpLoop ∷ SocketLike s ⇒ PortNumber → s → IO ()
+      httpLoop port so
+          = do (h, addr)  ← SL.accept so
+               tQueue     ← mkInteractionQueue
+               readerTID  ← forkIO $ requestReader cnf hm h port addr tQueue
+               _writerTID ← forkIO $ responseWriter cnf h tQueue readerTID
+               httpLoop port so
+
+      waitForever ∷ IO ()
+      waitForever = forever $ threadDelay 1000000