gameServer/OfficialServer/DBInteraction.hs
author unc0rr
Mon, 25 May 2009 17:33:39 +0000
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Add caching for accounts information (entries are stored in memory forever)
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{-# LANGUAGE CPP #-}
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module OfficialServer.DBInteraction
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(
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	startDBConnection
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) where
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import Prelude hiding (catch);
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import System.Process
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import System.IO
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import Control.Concurrent
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import Control.Exception
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import Control.Monad
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import qualified Data.Map as Map
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import Monad
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import Maybe
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import System.Log.Logger
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------------------------
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import CoreTypes
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import Utils
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localAddressList = ["127.0.0.1", "0:0:0:0:0:0:0:1", "0:0:0:0:0:ffff:7f00:1"]
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fakeDbConnection serverInfo = do
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	q <- readChan $ dbQueries serverInfo
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	case q of
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		CheckAccount clUid _ clHost -> do
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			writeChan (coreChan serverInfo) $ ClientAccountInfo (clUid,
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				if clHost `elem` localAddressList then Admin else Guest)
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	fakeDbConnection serverInfo
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#if defined(OFFICIAL_SERVER)
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-------------------------------------------------------------------
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-- borrowed from base 4.0.0 ---------------------------------------
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onException :: IO a -> IO b -> IO a                              --
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onException io what = io `catch` \e -> do what                   --
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                                          throw (e :: Exception) --
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-- to be deleted --------------------------------------------------
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-------------------------------------------------------------------
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pipeDbConnectionLoop queries coreChan hIn hOut accountsCache = do
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	q <- readChan queries
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	updatedCache <- case q of
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		CheckAccount clUid clNick _ -> do
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			let cacheEntry = clNick `Map.lookup` accountsCache
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			if isNothing cacheEntry then
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				do
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					hPutStrLn hIn $ show q
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					hFlush hIn
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					(clId, accountInfo) <- hGetLine hOut >>= (maybeException . maybeRead)
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					writeChan coreChan $ ClientAccountInfo (clId, accountInfo)
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					return $ Map.insert clNick accountInfo accountsCache
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				`onException`
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					(unGetChan queries q)
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				else
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				do
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					writeChan coreChan $ ClientAccountInfo (clUid, fromJust cacheEntry)
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					return accountsCache
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	return updatedCache
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	where
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		maybeException (Just a) = return a
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		maybeException Nothing = ioError (userError "Can't read")
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pipeDbConnection accountsCache serverInfo = do
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	updatedCache <-
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		Control.Exception.handle (\e -> warningM "Database" (show e) >> return accountsCache) $ do
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			(Just hIn, Just hOut, _, _) <-
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				createProcess (proc "./OfficialServer/extdbinterface" []) {std_in = CreatePipe, std_out = CreatePipe}
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			hSetBuffering hIn LineBuffering
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			hSetBuffering hOut LineBuffering
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			hPutStrLn hIn $ dbHost serverInfo
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			hPutStrLn hIn $ dbLogin serverInfo
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			hPutStrLn hIn $ dbPassword serverInfo
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			pipeDbConnectionLoop (dbQueries serverInfo) (coreChan serverInfo) hIn hOut accountsCache
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	threadDelay (5 * 10^6)
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	pipeDbConnection updatedCache serverInfo
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dbConnectionLoop = pipeDbConnection Map.empty
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#else
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dbConnectionLoop = fakeDbConnection
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#endif
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startDBConnection serverInfo =
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	if (not . null $ dbHost serverInfo) then
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		forkIO $ dbConnectionLoop serverInfo
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		else
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		--forkIO $ fakeDbConnection serverInfo
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		forkIO $ pipeDbConnection Map.empty serverInfo