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d7789b4380
This provides the ability to aggregate results in Prometheus, allowing metrics such as “average time per handler executed”. Summaries do not provide this facility, and since their use-case for other views on Prometheus is similar on `stackage-server`’s use-cases, it has been completely changed to Histograms.
74 lines
2.1 KiB
Haskell
74 lines
2.1 KiB
Haskell
module Import
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( module Import
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) where
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import ClassyPrelude.Yesod as Import
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import Foundation as Import
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import Settings as Import
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import Settings.StaticFiles as Import
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import Types as Import
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import Yesod.Auth as Import
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import Data.WebsiteContent as Import (WebsiteContent (..))
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import Data.Text.Read (decimal)
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import Data.Time.Clock (diffUTCTime)
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import qualified Prometheus as P
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import Stackage.Database (SnapName)
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import Formatting (format)
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import Formatting.Time (diff)
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parseLtsPair :: Text -> Maybe (Int, Int)
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parseLtsPair t1 = do
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(x, t2) <- either (const Nothing) Just $ decimal t1
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t3 <- stripPrefix "." t2
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(y, "") <- either (const Nothing) Just $ decimal t3
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Just (x, y)
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packageUrl :: SnapName -> PackageName -> Version -> Route App
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packageUrl sname pkgname pkgver = SnapshotR sname sdistR
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where
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sdistR = StackageSdistR (PNVNameVersion pkgname pkgver)
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haddockUrl :: SnapName
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-> Text -- ^ package-version
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-> Text -- ^ module name
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-> Route App
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haddockUrl sname pkgver name = HaddockR sname
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[ pkgver
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, omap toDash name ++ ".html"
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]
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where
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toDash '.' = '-'
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toDash c = c
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track
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:: MonadIO m
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=> String -> m a -> m a
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track name inner = do
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start <- liftIO getCurrentTime
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result <- inner
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end <- liftIO getCurrentTime
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let latency = fromRational $ toRational (end `diffUTCTime` start) * 1000000
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liftIO (P.withLabel name (P.observe latency) duration)
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return result
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where
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{-# NOINLINE duration #-}
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duration :: P.Metric (P.Vector P.Label1 P.Histogram)
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duration =
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P.unsafeRegisterIO
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(P.vector
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"fn"
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(P.histogram
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(P.Info
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"stackage_server_fn"
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"Stackage Server function call (duration in microseconds).")
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P.defaultBuckets))
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dateDiff :: UTCTime -- ^ now
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-> Day -- ^ target
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-> LText
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dateDiff (UTCTime now' _) target
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| now' == target = "today"
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| otherwise = format (diff True) $ diffUTCTime
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(UTCTime target 0)
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(UTCTime now' 0)
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