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import Control.Monad
import System.IO
import System.Exit
import System.Environment
import System.ZMQ4.Monadic
import qualified Data.ByteString as SB
main :: IO ()
main = do
args <- getArgs
when (length args /= 3) $ do
hPutStrLn stderr usage
exitFailure
let bindTo = args !! 0
size = read $ args !! 1
rounds = read $ args !! 2
runZMQ $ do
s <- socket Rep
bind s bindTo
loop s rounds size
where
loop s r sz = unless (r <= 0) $ do
msg <- receive s
when (SB.length msg /= sz) $
error "message of incorrect size received"
send s [] msg
loop s (r - 1) sz
usage :: String
usage = "usage: local_lat <bind-to> <message-size> <roundtrip-count>"
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