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First (hacky) working version of FastCGI JSON morphology server.

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bjorn
2008-08-24 19:31:12 +00:00
parent f8487ec6b9
commit 85bfb64e2a
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141
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{-# LANGUAGE DeriveDataTypeable #-}
module FastCGIUtils (initFastCGI, loopFastCGI,
DataRef, newDataRef, getData,
throwCGIError, handleCGIErrors) where
import Control.Concurrent
import Control.Exception
import Control.Monad
import Data.Dynamic
import Data.IORef
import Prelude hiding (catch)
import System.Directory
import System.Environment
import System.Exit
import System.IO
import System.IO.Unsafe
import System.Posix
import System.Time
import Network.FastCGI
initFastCGI :: IO ()
initFastCGI = installSignalHandlers
loopFastCGI :: CGI CGIResult -> IO ()
loopFastCGI f =
do (do runOneFastCGI f
exitIfToldTo
restartIfModified)
`catchAborted` logError "Request aborted"
loopFastCGI f
-- Signal handling for FastCGI programs.
installSignalHandlers :: IO ()
installSignalHandlers =
do t <- myThreadId
installHandler sigUSR1 (Catch gracefulExit) Nothing
installHandler sigTERM (Catch gracelessExit) Nothing
installHandler sigPIPE (Catch (requestAborted t)) Nothing
return ()
{-# NOINLINE shouldExit #-}
shouldExit :: IORef Bool
shouldExit = unsafePerformIO $ newIORef False
catchAborted :: IO a -> IO a -> IO a
catchAborted x y = x `catch` \e -> case e of
ErrorCall "**aborted**" -> y
_ -> throw e
requestAborted :: ThreadId -> IO ()
requestAborted t = throwTo t (ErrorCall "**aborted**")
gracelessExit :: IO ()
gracelessExit = do logError "Graceless exit"
exitWith ExitSuccess
gracefulExit :: IO ()
gracefulExit =
do logError "Graceful exit"
writeIORef shouldExit True
exitIfToldTo :: IO ()
exitIfToldTo =
do b <- readIORef shouldExit
when b $ do logError "Exiting..."
exitWith ExitSuccess
-- Restart handling for FastCGI programs.
{-# NOINLINE myModTimeRef #-}
myModTimeRef :: IORef EpochTime
myModTimeRef = unsafePerformIO (getProgModTime >>= newIORef)
-- FIXME: doesn't get directory
myProgPath :: IO FilePath
myProgPath = getProgName
getProgModTime :: IO EpochTime
getProgModTime = liftM modificationTime (myProgPath >>= getFileStatus)
needsRestart :: IO Bool
needsRestart = liftM2 (/=) (readIORef myModTimeRef) getProgModTime
exitIfModified :: IO ()
exitIfModified =
do restart <- needsRestart
when restart $ exitWith ExitSuccess
restartIfModified :: IO ()
restartIfModified =
do restart <- needsRestart
when restart $ do prog <- myProgPath
args <- getArgs
hPutStrLn stderr $ prog ++ " has been modified, restarting ..."
-- FIXME: setCurrentDirectory?
executeFile prog False args Nothing
-- Utilities for getting and caching read-only data from disk.
-- The data is reloaded when the file on disk has been modified.
type DataRef a = IORef (Maybe (ClockTime, a))
newDataRef :: MonadIO m => m (DataRef a)
newDataRef = liftIO $ newIORef Nothing
getData :: MonadIO m => (FilePath -> m a) -> DataRef a -> FilePath -> m a
getData loadData ref file =
do t' <- liftIO $ getModificationTime file
m <- liftIO $ readIORef ref
case m of
Just (t,x) | t' == t -> return x
_ -> do logCGI $ "Loading " ++ show file ++ "..."
x <- loadData file
liftIO $ writeIORef ref (Just (t',x))
return x
-- Logging
logError :: String -> IO ()
logError s = hPutStrLn stderr s
-- * General CGI Error exception mechanism
data CGIError = CGIError { cgiErrorCode :: Int, cgiErrorMessage :: String, cgiErrorText :: [String] }
deriving Typeable
throwCGIError :: Int -> String -> [String] -> CGI a
throwCGIError c m t = throwCGI $ DynException $ toDyn $ CGIError c m t
handleCGIErrors :: CGI CGIResult -> CGI CGIResult
handleCGIErrors x = x `catchCGI` \e -> case e of
DynException d -> case fromDynamic d of
Nothing -> throw e
Just (CGIError c m t) -> outputError c m t
_ -> throw e

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src/morpho-server/Makefile Normal file
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.PHONY: gf-morpho.fcgi clean
gf-morpho.fcgi:
ghc -i.. --make -o $@ MorphoServer.hs
# cabal configure
# cabal build
# cp dist/build/$@/$@ .
clean:
cabal clean

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import GF.Compile
import GF.Data.Operations
import GF.Grammar.API
import GF.Grammar.Grammar (Term)
import GF.Grammar.PrGrammar (prTermTabular)
import GF.Infra.Option
import GF.Infra.UseIO
import GF.Text.UTF8
import Network.FastCGI
import Text.JSON
import qualified Codec.Binary.UTF8.String as UTF8 (encodeString)
import Control.Monad
import System.Environment
import System.FilePath
import FastCGIUtils
import URLEncoding
-- FIXME !!!!!!
grammarFile :: IO FilePath
grammarFile = return "/Users/bringert/Projects/gf/lib/alltenses/ParadigmsFin.gfo"
grammarPath :: FilePath
grammarPath = "/Users/bringert/Projects/gf/lib/prelude"
main :: IO ()
main = do initFastCGI
r <- newDataRef
loopFastCGI (handleErrors (handleCGIErrors (fcgiMain r)))
fcgiMain :: DataRef Grammar -> CGI CGIResult
fcgiMain ref = liftIO grammarFile >>= getData readGrammar ref >>= cgiMain
readGrammar :: FilePath -> CGI Grammar
readGrammar file =
do let opts = concatOptions [modifyFlags $ \fs -> fs { optVerbosity = Quiet },
modifyModuleFlags $ \fs -> fs { optLibraryPath = [grammarPath] }]
mgr <- liftIO $ appIOE $ batchCompile opts [file]
err (throwCGIError 500 "Grammar loading error" . (:[])) return mgr
cgiMain :: Grammar -> CGI CGIResult
cgiMain sgr =
do path <- pathInfo
json <- case path of
"/eval" -> do mjson <- return (doEval sgr) `ap` getTerm
err (throwCGIError 400 "Evaluation error" . (:[])) return mjson
_ -> throwCGIError 404 "Not Found" ["Resource not found: " ++ path]
outputJSON json
where
getTerm :: CGI String
getTerm = do mt <- getInput "term"
maybe (throwCGIError 400 "No term given" ["No term given"]) (return . urlDecodeUnicode) mt
doEval :: Grammar -> String -> Err JSValue
doEval sgr t = liftM termToJSValue $ eval sgr t
-- FIXME
termToJSValue :: Term -> JSValue
termToJSValue = showJSON . toJSObject . prTermTabular
eval :: Grammar -> String -> Err Term
eval sgr t = pTerm t >>= checkTerm sgr >>= computeTerm sgr
-- * General CGI and JSON stuff
outputJSON :: JSON a => a -> CGI CGIResult
outputJSON x = do setHeader "Content-Type" "text/json; charset=utf-8"
outputStrict $ UTF8.encodeString $ encode x
outputStrict :: String -> CGI CGIResult
outputStrict x | x == x = output x
| otherwise = fail "I am the pope."

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src/morpho-server/URLEncoding.hs Normal file
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module URLEncoding where
import Data.Bits (shiftL, (.|.))
import Data.Char (chr,digitToInt,isHexDigit)
urlDecodeUnicode :: String -> String
urlDecodeUnicode [] = ""
urlDecodeUnicode ('%':'u':x1:x2:x3:x4:s)
| all isHexDigit [x1,x2,x3,x4] =
chr ( digitToInt x1 `shiftL` 12
.|. digitToInt x2 `shiftL` 8
.|. digitToInt x3 `shiftL` 4
.|. digitToInt x4) : urlDecodeUnicode s
urlDecodeUnicode ('%':x1:x2:s) | isHexDigit x1 && isHexDigit x2 =
chr ( digitToInt x1 `shiftL` 4
.|. digitToInt x2) : urlDecodeUnicode s
urlDecodeUnicode (c:s) = c : urlDecodeUnicode s

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src/morpho-server/gf-morpo-server.cabal Normal file
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name: gf-morpho-server
version: 1.0
cabal-version: >= 1.2
build-type: Simple
license: GPL
license-file: LICENSE
synopsis: FastCGI Morphology Server for Grammatical Framework
executable gf-morpho.fcgi
build-depends: base,
old-time,
unix,
directory,
containers,
gf,
cgi,
fastcgi,
json,
utf8-string
main-is: MorphoServer.hs
other-modules:
FastCGIUtils