gameServer/OfficialServer/DBInteraction.hs
author sheepluva
Mon, 28 Jun 2010 08:52:17 +0200
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{-# LANGUAGE CPP, ScopedTypeVariables, OverloadedStrings #-}
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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 qualified Control.Exception as 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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import Data.Time
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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 = forever $ 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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        ClearCache -> return ()
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        SendStats {} -> return ()
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#if defined(OFFICIAL_SERVER)
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pipeDbConnectionLoop queries coreChan hIn hOut accountsCache =
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    Exception.handle (\(e :: Exception.IOException) -> warningM "Database" (show e) >> return accountsCache) $
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    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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            currentTime <- getCurrentTime
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            if (isNothing cacheEntry) || (currentTime `diffUTCTime` (fst . fromJust) cacheEntry > 2 * 24 * 60 * 60) 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 (currentTime, accountInfo) accountsCache
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                `Exception.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, snd $ fromJust cacheEntry)
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                    return accountsCache
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        ClearCache -> return Map.empty
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        SendStats {} -> (
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                (hPutStrLn hIn $ show q) >>
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                hFlush hIn >>
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                return accountsCache)
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                `Exception.onException`
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                (unGetChan queries q)
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    pipeDbConnectionLoop queries coreChan hIn hOut 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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        Exception.handle (\(e :: Exception.IOException) -> warningM "Database" (show e) >> return accountsCache) $ do
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            (Just hIn, Just hOut, _, _) <- createProcess (proc "./OfficialServer/extdbinterface" [])
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                    {std_in = CreatePipe,
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                    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 (3 * 10^6)
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    pipeDbConnection updatedCache serverInfo
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dbConnectionLoop serverInfo =
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        if (not . null $ dbHost serverInfo) then
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            pipeDbConnection Map.empty serverInfo
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        else
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            fakeDbConnection serverInfo
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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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    forkIO $ dbConnectionLoop serverInfo