Hello, all! Can somebody please explain, what is the best way of using CURL with several threads? I wrote simple client, which tries to authenticate against HTTP server. With running this client, it starts to eat memory insanely (and I know this code is far, far away of even being close to be called good one )
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module NTLMTest where
import System.IO
import Network.Curl
import Control.Concurrent
import Control.Concurrent.Chan
type ResponseState = Either Bool String
type RespChannel = Chan ResponseState
delay = 500 * 1000
isResponseOk :: String -> CurlResponse -> ResponseState
isResponseOk username response = case respCurlCode response of
CurlOK -> Left True
_ -> Right $ username ++ " => " ++
respStatusLine response ++ " :: " ++ (show . respStatus $ response)
checkAuthResponse :: RespChannel -> String -> String -> String -> IO ()
checkAuthResponse state user passwd url = do
response <- curlGetResponse_ url
[CurlHttpAuth [HttpAuthAny], CurlUserPwd $ user ++ ":" ++ passwd]
writeChan state $ isResponseOk user response
threadDelay $ delay
runHTTPThread :: RespChannel -> (String,String) -> IO ()
runHTTPThread state (user,passwd) = checkAuthResponse state user passwd url
url = "http://localhost:8082/";
credentials = map (\i -> ("user" ++ show i,"123456")) [1..21]
main = withCurlDo $ do
chan <- newChan :: IO (RespChannel)
mapM_ ( \cred -> forkIO $ runHTTPThread chan cred ) credentials
dumpChannel chan $ length credentials
main
where
dumpChannel :: RespChannel -> Int -> IO ()
dumpChannel _chan n | n == 0 = return ()
| otherwise = do state <- readChan _chan
case state of
(Left _) -> return ()
--putStrLn "OK"
(Right err) -> putStrLn err
dumpChannel _chan $ n-1
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If I get rid of forkIO - it stops at 40-50 megabytes and don't raise memory
usage anymore.
Also, I noticed that (either because of buffering, or may be something else)
results are appearing on console much slower than if I simply use "wget" with
looping in shell script. JMeter also reports awesome speed, so server can
authenticate tens of concurrent users per second (thus it's not server or
connection bandwidth issue).
Hopefully, someone could help me in overcoming my ignorance :)
--
Eugene N Dzhurinsky
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