eidolon/app/DevelMain.hs

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2014-08-09 18:33:22 +00:00
-- | Development version to be run inside GHCi.
--
-- start this up with:
--
-- cabal repl --ghc-options="-O0 -fobject-code"
--
-- You will need to add these packages to your .cabal file
-- * foreign-store (very light-weight)
-- * warp (you already depend on this, it just isn't in your .cabal file)
--
-- If you don't use cabal repl, you will need
-- to run the following in GHCi or to add it to
-- your .ghci file.
--
-- :set -DDEVELOPMENT
--
-- There is more information about this approach,
-- on the wiki: https://github.com/yesodweb/yesod/wiki/ghci
module DevelMain where
import Application (getApplicationDev)
import Control.Exception (finally)
import Control.Concurrent
import Data.IORef
import Foreign.Store
import Network.Wai.Handler.Warp
-- | Start or restart the server.
update :: IO ()
update = do
mtidStore <- lookupStore tid_1
case mtidStore of
Nothing -> do
done <- newEmptyMVar
_done_0 <- newStore done
tid <- start done
tidRef <- newIORef tid
_tid_1 <- newStore tidRef
return ()
Just tidStore -> do
tidRef <- readStore tidStore
tid <- readIORef tidRef
done <- readStore (Store done_0)
killThread tid
takeMVar done
newTid <- start done
writeIORef tidRef newTid
where tid_1 = 1
done_0 = 0
-- | Start the server in a separate thread.
start :: MVar () -- ^ Written to when the thread is killed.
-> IO ThreadId
start done = do
(port,app) <- getApplicationDev
forkIO (finally (runSettings (setPort port defaultSettings) app)
(putMVar done ()))