Initial commit

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Timo von Holtz 2015-05-01 12:40:08 +10:00
commit d3bd502568
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.gitignore vendored Normal file
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*cabal.config
*cabal.sandbox.config
.cabal-sandbox/*
*dist/

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LICENSE Normal file
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Copyright (c) 2015, Anchor Systems
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of Anchor Systems nor the names of other
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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Setup.hs Normal file
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import Distribution.Simple
main = defaultMain

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ekg-servant.cabal Normal file
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name: ekg-servant
version: 0.1.0.0
synopsis: Helpers for using ekg with servant
description: Helpers for using ekg with servant
license: BSD3
license-file: LICENSE
author: Anchor Engineering <engineering@lists.anchor.net.au>
maintainer: Anchor Engineering <engineering@lists.anchor.net.au>
category: System
build-type: Simple
cabal-version: >=1.10
source-repository HEAD
type: git
location: https://github.com/anchor/ekg-servant.git
library
exposed-modules: Servant.Ekg
build-depends: base >=4.7 && <4.9
, ekg-core
, http-types
, time
, wai
default-language: Haskell2010

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lib/Servant/Ekg.hs Normal file
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module Servant.Ekg where
import Control.Exception
import Data.Time.Clock
import Network.HTTP.Types
import Network.Wai
import qualified System.Metrics.Counter as Counter
import qualified System.Metrics.Distribution as Distribution
import qualified System.Metrics.Gauge as Gauge
gaugeInflight :: Gauge.Gauge -> Middleware
gaugeInflight inflight application request respond =
bracket_ (Gauge.inc inflight)
(Gauge.dec inflight)
(application request respond)
-- | Count responses with 2XX, 4XX, 5XX, and XXX response codes.
countResponseCodes
:: (Counter.Counter, Counter.Counter, Counter.Counter, Counter.Counter)
-> Middleware
countResponseCodes (c2XX, c4XX, c5XX, cXXX) application request respond =
application request respond'
where
respond' res = count (responseStatus res) >> respond res
count Status{statusCode = sc }
| 200 <= sc && sc < 300 = Counter.inc c2XX
| 400 <= sc && sc < 500 = Counter.inc c4XX
| 500 <= sc && sc < 600 = Counter.inc c5XX
| otherwise = Counter.inc cXXX
responseTimeDistribution :: Distribution.Distribution -> Middleware
responseTimeDistribution dist application request respond =
bracket getCurrentTime stop $ const $ application request respond
where
stop t1 = do
t2 <- getCurrentTime
let dt = diffUTCTime t2 t1
Distribution.add dist $ fromRational $ toRational dt