gameServer/OfficialServer/DBInteraction.hs
author nemo
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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 Control.Concurrent
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import Control.Monad
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import Data.List as L
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import Data.ByteString.Char8 as B
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#if defined(OFFICIAL_SERVER)
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import System.Process
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import System.IO as SIO
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import qualified Control.Exception as Exception
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import qualified Data.Map as Map
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import Data.Maybe
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import Data.Time
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import System.Log.Logger
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#endif
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------------------------
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import CoreTypes
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#if defined(OFFICIAL_SERVER)
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import Utils
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#endif
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localAddressList :: [B.ByteString]
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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 :: forall b. ServerInfo -> IO b
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fakeDbConnection si = forever $ do
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    q <- readChan $ dbQueries si
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    case q of
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        CheckAccount clId clUid _ clHost ->
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            writeChan (coreChan si) $ ClientAccountInfo clId clUid (if clHost `L.elem` localAddressList then Admin else Guest)
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        ClearCache -> return ()
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        SendStats {} -> return ()
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dbConnectionLoop :: forall b. ServerInfo -> IO b
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#if defined(OFFICIAL_SERVER)
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flushRequests :: ServerInfo -> IO ()
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flushRequests si = do
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    e <- isEmptyChan $ dbQueries si
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    unless e $ do
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        q <- readChan $ dbQueries si
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        case q of
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            CheckAccount clId clUid _ clHost ->
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                writeChan (coreChan si) $ ClientAccountInfo clId clUid (if clHost `L.elem` localAddressList then Admin else Guest)
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            ClearCache -> return ()
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            SendStats {} -> return ()
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        flushRequests si
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pipeDbConnectionLoop :: Chan DBQuery -> Chan CoreMessage -> Handle -> Handle -> Map.Map ByteString (UTCTime, AccountInfo) -> Int -> IO (Map.Map ByteString (UTCTime, AccountInfo), Int)
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pipeDbConnectionLoop queries cChan hIn hOut accountsCache req =
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    Exception.handle (\(e :: Exception.IOException) -> warningM "Database" (show e) >> return (accountsCache, req)) $
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    do
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    q <- readChan queries
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    (updatedCache, newReq) <- case q of
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        CheckAccount clId 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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                    SIO.hPutStrLn hIn $ show q
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                    hFlush hIn
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                    (clId', clUid', accountInfo) <- SIO.hGetLine hOut >>= (maybeException . maybeRead)
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                    writeChan cChan $ ClientAccountInfo clId' clUid' accountInfo
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                    return $ (Map.insert clNick (currentTime, accountInfo) accountsCache, req + 1)
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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 cChan $ ClientAccountInfo clId clUid (snd $ fromJust cacheEntry)
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                    return (accountsCache, req)
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        ClearCache -> return (Map.empty, req)
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        SendStats {} -> (
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                (SIO.hPutStrLn hIn $ show q) >>
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                hFlush hIn >>
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                return (accountsCache, req))
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                `Exception.onException`
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                (unGetChan queries q)
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    pipeDbConnectionLoop queries cChan hIn hOut updatedCache newReq
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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 :: forall b. Map.Map ByteString (UTCTime, AccountInfo) -> ServerInfo -> Int -> IO b
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pipeDbConnection accountsCache si errNum = do
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    (updatedCache, newErrNum) <-
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        Exception.handle (\(e :: Exception.IOException) -> warningM "Database" (show e) >> return (accountsCache, errNum + 1)) $ 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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            B.hPutStrLn hIn $ dbHost si
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            B.hPutStrLn hIn $ dbLogin si
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            B.hPutStrLn hIn $ dbPassword si
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            (c, r) <- pipeDbConnectionLoop (dbQueries si) (coreChan si) hIn hOut accountsCache 0
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            return (c, if r > 0 then 0 else errNum + 1)
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    when (newErrNum > 1) $ flushRequests si
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    threadDelay (3000000)
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    pipeDbConnection updatedCache si newErrNum
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dbConnectionLoop si =
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        if (not . B.null $ dbHost si) then
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            pipeDbConnection Map.empty si 0
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        else
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            fakeDbConnection si
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#else
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dbConnectionLoop = fakeDbConnection
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#endif
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startDBConnection :: ServerInfo -> IO ()
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startDBConnection serverInfo =
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    forkIO (dbConnectionLoop serverInfo) >> return ()