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EKG.hs
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EKG.hs
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{-# LANGUAGE CPP #-}
module Development.IDE.Monitoring.EKG(monitoring) where
import Development.IDE.Types.Monitoring (Monitoring (..))
import Development.IDE.Types.Logger (Logger)
#ifdef MONITORING_EKG
import Control.Concurrent (killThread)
import Control.Concurrent.Async (async, waitCatch)
import Control.Monad (forM_)
import Data.Text (pack)
import Development.IDE.Types.Logger (logInfo)
import qualified System.Remote.Monitoring.Wai as Monitoring
import qualified System.Metrics as Monitoring
-- | Monitoring using EKG
monitoring :: Logger -> Int -> IO Monitoring
monitoring logger port = do
store <- Monitoring.newStore
Monitoring.registerGcMetrics store
let registerCounter name read = Monitoring.registerCounter name read store
registerGauge name read = Monitoring.registerGauge name read store
start = do
server <- do
let startServer = Monitoring.forkServerWith store "localhost" port
-- this can fail if the port is busy, throwing an async exception back to us
-- to handle that, wrap the server thread in an async
mb_server <- async startServer >>= waitCatch
case mb_server of
Right s -> do
logInfo logger $ pack $
"Started monitoring server on port " <> show port
return $ Just s
Left e -> do
logInfo logger $ pack $
"Unable to bind monitoring server on port "
<> show port <> ":" <> show e
return Nothing
return $ forM_ server $ \s -> do
logInfo logger "Stopping monitoring server"
killThread $ Monitoring.serverThreadId s
return $ Monitoring {..}
#else
monitoring :: Logger -> Int -> IO Monitoring
monitoring _ _ = mempty
#endif