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Monitor "upstream" processes with EKG
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{-# LANGUAGE OverloadedStrings #-} | |
import System.Remote.Monitoring | |
import Control.Monad | |
import Control.Concurrent | |
main :: IO () | |
main = forkServer "localhost" 8000 >> readwords | |
readwords :: IO () | |
readwords = forever $ readFile "/usr/share/dict/words" >>= print . length . words >> threadDelay 1000000 |
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{-# LANGUAGE OverloadedStrings #-} | |
{-# LANGUAGE QuasiQuotes #-} | |
module EkgJsonParser where | |
import Data.Aeson | |
import Data.Aeson.Types | |
import Control.Monad | |
import Data.ByteString.Lazy | |
import Text.InterpolatedString.Perl6 | |
import qualified Data.HashMap.Strict as H | |
import qualified Data.Text as T | |
type AscList = [(T.Text, Double)] | |
data EkgData = EkgData { unCounters :: AscList, unGauges :: AscList } deriving Show | |
instance FromJSON EkgData where | |
parseJSON (Object x) = parseObject x | |
parseJSON _ = mzero | |
parseObject :: Object -> Parser EkgData | |
parseObject x = do | |
counters <- x .: "counters" | |
gauges <- x .: "gauges" | |
return (EkgData (H.toList counters) (H.toList gauges)) | |
testData :: ByteString | |
testData = [q|{ | |
"counters": {"one": 1, "two": 2}, | |
"gauges": {"three": 1, "four": 2} | |
}|] | |
decodeEkgData :: ByteString -> Maybe EkgData | |
decodeEkgData = decode | |
decodeValue :: ByteString -> Maybe Value | |
decodeValue = decode | |
test :: IO () | |
test = do | |
print testData | |
print $ decodeValue testData | |
print $ decodeEkgData testData |
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{-# LANGUAGE OverloadedStrings #-} | |
import Network.HTTP.Conduit | |
import Control.Monad | |
import Data.Monoid | |
import Control.Applicative | |
import Control.Monad.IO.Class | |
import qualified Data.Text as T | |
import qualified Data.ByteString as B | |
import qualified Data.ByteString.Lazy as L | |
import Network.HTTP.Types.Header (HeaderName) | |
import System.Remote.Monitoring | |
import System.Remote.Gauge as G | |
import Control.Concurrent | |
import EkgJsonParser | |
jsonRequest :: MonadIO m => String -> m L.ByteString | |
jsonRequest url = liftIO $ withManager $ \man -> do | |
req <- liftIO $ parseUrl url | |
responseBody <$> httpLbs (setHeaders [("Accept", "application/json"), ("Connection", "close")] req) man | |
setHeaders :: [(HeaderName, B.ByteString)] -> Request m -> Request m | |
setHeaders l r = r { requestHeaders = foldr (:) (requestHeaders r) l } | |
main :: IO () | |
main = do | |
server <- forkServer "localhost" 9000 | |
void $ forever $ upstream "http://localhost:8000/" server >> threadDelay 10000000 | |
upstream :: String -> Server -> IO () | |
upstream location server = do | |
putStrLn $ "Remote Read: " ++ location | |
response <- decodeEkgData <$> jsonRequest location | |
case response | |
of Nothing -> putStrLn "SUX" | |
(Just l) -> process location server (unGauges l) | |
process :: String -> Server -> [(T.Text, Double)] -> IO () | |
process r s l = do | |
gs <- mapM (flip getGauge s) (map ((\x -> T.pack r <> "->" <> x) . fst) l) | |
sequence_ $ zipWith G.set gs (map (floor . snd) l) |
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