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{-# LANGUAGE TupleSections #-}
module Tracking
( tracking
, ppTracked
, EkgMetric
, Step
) where
import Core
import Options
import Prelude
import Control.Monad.IO.Class
import Data.List (intersperse)
import Data.Text (Text)
import Servant.Client
import System.Metrics.Json (Value)
import Gargantext.API.Client
import qualified Data.Text as T
-- | e.g @["rts", "gc", "bytes_allocated"]@
type EkgMetric = [Text]
-- | Any textual description of a step
type Step = Text
-- | Track EKG metrics before/after running a bunch of computations
-- that can talk to the backend.
tracking
:: ClientOpts
-> [Text] -- ^ e.g @["rts.gc.bytes_allocated"]@
-> [(Step, ClientM a)]
-> ClientM [Either [(EkgMetric, Value)] (Step, a)]
-- no steps, nothing to do
tracking _ _ [] = return []
-- no metrics to track, we just run the steps
tracking _ [] steps = traverse runStep steps
-- metrics to track: we intersperse metric fetching and steps,
-- starting and ending with metric fetching
tracking opts ms' steps = mix (Left <$> fetchMetrics) (map runStep steps)
where fetchMetrics :: ClientM [(EkgMetric, Value)]
fetchMetrics = flip traverse ms $ \metric -> do
whenVerbose opts $
liftIO . putStrLn $ "[Debug] metric to track: " ++ T.unpack (T.intercalate "." metric)
dat <- (metric,) <$> getMetricSample metric
whenVerbose opts $
liftIO . putStrLn $ "[Debug] metric pulled: " ++ show dat
return dat
mix :: ClientM a -> [ClientM a] -> ClientM [a]
mix x xs = sequence $ [x] ++ intersperse x xs ++ [x]
ms = map (T.splitOn ".") ms'
-- ^ A trivial function to print results of steps and sampled metrics
ppTracked :: Show a => [Either [(EkgMetric, Value)] (Step, a)] -> ClientM ()
ppTracked [] = return ()
ppTracked (Right (step, a) : rest) = do
liftIO . putStrLn $ "[step: " ++ T.unpack step ++ "] returned: " ++ show a
ppTracked rest
ppTracked (Left ms : rest) = do
liftIO . putStrLn $ unlines
[ T.unpack (T.intercalate "." metric) ++ " = " ++ show val
| (metric, val) <- ms
]
ppTracked rest
runStep :: (Step, ClientM a) -> ClientM (Either e (Step, a))
runStep (step, act) = Right . (step,) <$> act