gameServer/Utils.hs
author koda
Sat, 26 Jun 2010 04:36:28 +0200
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{-# LANGUAGE OverloadedStrings #-}
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module Utils where
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import Control.Concurrent
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import Control.Concurrent.STM
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import Data.Char
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import Data.Word
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import qualified Data.Map as Map
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import qualified Data.IntMap as IntMap
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import qualified Data.Set as Set
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import Data.ByteString.Internal (w2c)
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import Numeric
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import Network.Socket
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import System.IO
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import qualified Data.List as List
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import Control.Monad
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import Maybe
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-------------------------------------------------
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import qualified Codec.Binary.Base64 as Base64
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import qualified Data.ByteString.Char8 as B
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import qualified Data.ByteString as BW
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import CoreTypes
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sockAddr2String :: SockAddr -> IO B.ByteString
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sockAddr2String (SockAddrInet _ hostAddr) = liftM B.pack $ inet_ntoa hostAddr
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sockAddr2String (SockAddrInet6 _ _ (a, b, c, d) _) =
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    return $ B.pack $ (foldr1 (.)
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        $ List.intersperse (\a -> ':':a)
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        $ concatMap (\n -> (\(a, b) -> [showHex a, showHex b]) $ divMod n 65536) [a, b, c, d]) []
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toEngineMsg :: B.ByteString -> B.ByteString
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toEngineMsg msg = B.pack $ Base64.encode (fromIntegral (BW.length msg) : (BW.unpack msg))
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fromEngineMsg :: B.ByteString -> Maybe B.ByteString
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fromEngineMsg msg = Base64.decode (B.unpack msg) >>= removeLength >>= return . BW.pack
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    where
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        removeLength (x:xs) = if length xs == fromIntegral x then Just xs else Nothing
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        removeLength _ = Nothing
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checkNetCmd :: B.ByteString -> (Bool, Bool)
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checkNetCmd = check . liftM B.unpack . fromEngineMsg
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    where
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        check Nothing = (False, False)
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        check (Just (m:ms)) = (m `Set.member` legalMessages, m == '+')
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        check _ = (False, False)
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        legalMessages = Set.fromList $ "M#+LlRrUuDdZzAaSjJ,sFNpPwtghb12345" ++ slotMessages
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        slotMessages = "\128\129\130\131\132\133\134\135\136\137\138"
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maybeRead :: Read a => String -> Maybe a
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maybeRead s = case reads s of
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    [(x, rest)] | all isSpace rest -> Just x
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    _         -> Nothing
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teamToNet :: Word16 -> TeamInfo -> [B.ByteString]
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teamToNet protocol team 
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    | protocol < 30 =
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        "ADD_TEAM"
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        : teamname team
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        : teamgrave team
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        : teamfort team
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        : teamvoicepack team
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        : teamowner team
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        : (B.pack $ show $ difficulty team)
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        : hhsInfo
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    | otherwise = 
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        "ADD_TEAM"
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        : teamname team
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        : teamgrave team
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        : teamfort team
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        : teamvoicepack team
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        : teamflag team
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        : teamowner team
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        : (B.pack $ show $ difficulty team)
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        : hhsInfo
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    where
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        hhsInfo = concatMap (\(HedgehogInfo name hat) -> [name, hat]) $ hedgehogs team
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modifyTeam :: TeamInfo -> RoomInfo -> RoomInfo
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modifyTeam team room = room{teams = replaceTeam team $ teams room}
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    where
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    replaceTeam _ [] = error "modifyTeam: no such team"
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    replaceTeam team (t:teams) =
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        if teamname team == teamname t then
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            team : teams
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        else
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            t : replaceTeam team teams
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illegalName :: B.ByteString -> Bool
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illegalName = all isSpace . B.unpack
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protoNumber2ver :: Word16 -> B.ByteString
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protoNumber2ver 17 = "0.9.7-dev"
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protoNumber2ver 19 = "0.9.7"
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protoNumber2ver 20 = "0.9.8-dev"
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protoNumber2ver 21 = "0.9.8"
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protoNumber2ver 22 = "0.9.9-dev"
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protoNumber2ver 23 = "0.9.9"
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protoNumber2ver 24 = "0.9.10-dev"
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protoNumber2ver 25 = "0.9.10"
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protoNumber2ver 26 = "0.9.11-dev"
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protoNumber2ver 27 = "0.9.11"
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protoNumber2ver 28 = "0.9.12-dev"
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protoNumber2ver 29 = "0.9.12"
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protoNumber2ver 30 = "0.9.13-dev"
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protoNumber2ver 31 = "0.9.13"
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protoNumber2ver 32 = "0.9.14-dev"
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protoNumber2ver _ = "Unknown"
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askFromConsole :: String -> IO String
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askFromConsole msg = do
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    putStr msg
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    hFlush stdout
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    getLine
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unfoldrE :: (b -> Either b (a, b)) -> b -> ([a], b)
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unfoldrE f b  =
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    case f b of
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        Right (a, new_b) -> let (a', b') = unfoldrE f new_b in (a : a', b')
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        Left new_b       -> ([], new_b)
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showB :: Show a => a -> B.ByteString
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showB = B.pack .show