Setup Wai Middleware request logger to drop (not log) some requests












-1















I have an app where the Nginx reverse proxy is making a lot of requests to my health endpoint. I'd like to not log these at all so my output logs are smaller. I'm also logging everything as JSON using Network.Wai.Middleware.RequestLogger.JSON, which has a function to format log messages as JSON.



One thing I could do is log an empty bytestring, but I was thinking there may be some way to no-op the log call. I can't figure out how to do that from looking at the various RequestLogger functions in wai-extra.



Does anyone have a recommendation for how to build a custom Middleware in order to not-log certain requests?










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  • 1





    This might be useful: hackage.haskell.org/package/filter-logger

    – Chris Stryczynski
    Jan 3 at 10:32
















-1















I have an app where the Nginx reverse proxy is making a lot of requests to my health endpoint. I'd like to not log these at all so my output logs are smaller. I'm also logging everything as JSON using Network.Wai.Middleware.RequestLogger.JSON, which has a function to format log messages as JSON.



One thing I could do is log an empty bytestring, but I was thinking there may be some way to no-op the log call. I can't figure out how to do that from looking at the various RequestLogger functions in wai-extra.



Does anyone have a recommendation for how to build a custom Middleware in order to not-log certain requests?










share|improve this question




















  • 1





    This might be useful: hackage.haskell.org/package/filter-logger

    – Chris Stryczynski
    Jan 3 at 10:32














-1












-1








-1








I have an app where the Nginx reverse proxy is making a lot of requests to my health endpoint. I'd like to not log these at all so my output logs are smaller. I'm also logging everything as JSON using Network.Wai.Middleware.RequestLogger.JSON, which has a function to format log messages as JSON.



One thing I could do is log an empty bytestring, but I was thinking there may be some way to no-op the log call. I can't figure out how to do that from looking at the various RequestLogger functions in wai-extra.



Does anyone have a recommendation for how to build a custom Middleware in order to not-log certain requests?










share|improve this question
















I have an app where the Nginx reverse proxy is making a lot of requests to my health endpoint. I'd like to not log these at all so my output logs are smaller. I'm also logging everything as JSON using Network.Wai.Middleware.RequestLogger.JSON, which has a function to format log messages as JSON.



One thing I could do is log an empty bytestring, but I was thinking there may be some way to no-op the log call. I can't figure out how to do that from looking at the various RequestLogger functions in wai-extra.



Does anyone have a recommendation for how to build a custom Middleware in order to not-log certain requests?







haskell haskell-wai






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edited Jan 8 at 13:50









Christophe Strobbe

1,42011023




1,42011023










asked Jan 2 at 23:23









erewokerewok

5,42422234




5,42422234








  • 1





    This might be useful: hackage.haskell.org/package/filter-logger

    – Chris Stryczynski
    Jan 3 at 10:32














  • 1





    This might be useful: hackage.haskell.org/package/filter-logger

    – Chris Stryczynski
    Jan 3 at 10:32








1




1





This might be useful: hackage.haskell.org/package/filter-logger

– Chris Stryczynski
Jan 3 at 10:32





This might be useful: hackage.haskell.org/package/filter-logger

– Chris Stryczynski
Jan 3 at 10:32












1 Answer
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I created a custom formatter in the following way:



-- | Wai Application Middleware logger
jsonRequestLogger :: IO Middleware
jsonRequestLogger = mkRequestLogger
$ def { outputFormat = CustomOutputFormatWithDetails dontLogHealthEndpoint }


dontLogHealthEndpoint :: OutputFormatterWithDetails
dontLogHealthEndpoint date req status responseSize duration reqBody response =
if B.isInfixOf "health" $ rawPathInfo req
then toLogStr B.empty
else formatAsJSON date req status responseSize duration reqBody response


This seems to work fine. However, I'd still like to know if there's a better way.






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    1 Answer
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    1 Answer
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    active

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    oldest

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    active

    oldest

    votes









    1














    I created a custom formatter in the following way:



    -- | Wai Application Middleware logger
    jsonRequestLogger :: IO Middleware
    jsonRequestLogger = mkRequestLogger
    $ def { outputFormat = CustomOutputFormatWithDetails dontLogHealthEndpoint }


    dontLogHealthEndpoint :: OutputFormatterWithDetails
    dontLogHealthEndpoint date req status responseSize duration reqBody response =
    if B.isInfixOf "health" $ rawPathInfo req
    then toLogStr B.empty
    else formatAsJSON date req status responseSize duration reqBody response


    This seems to work fine. However, I'd still like to know if there's a better way.






    share|improve this answer




























      1














      I created a custom formatter in the following way:



      -- | Wai Application Middleware logger
      jsonRequestLogger :: IO Middleware
      jsonRequestLogger = mkRequestLogger
      $ def { outputFormat = CustomOutputFormatWithDetails dontLogHealthEndpoint }


      dontLogHealthEndpoint :: OutputFormatterWithDetails
      dontLogHealthEndpoint date req status responseSize duration reqBody response =
      if B.isInfixOf "health" $ rawPathInfo req
      then toLogStr B.empty
      else formatAsJSON date req status responseSize duration reqBody response


      This seems to work fine. However, I'd still like to know if there's a better way.






      share|improve this answer


























        1












        1








        1







        I created a custom formatter in the following way:



        -- | Wai Application Middleware logger
        jsonRequestLogger :: IO Middleware
        jsonRequestLogger = mkRequestLogger
        $ def { outputFormat = CustomOutputFormatWithDetails dontLogHealthEndpoint }


        dontLogHealthEndpoint :: OutputFormatterWithDetails
        dontLogHealthEndpoint date req status responseSize duration reqBody response =
        if B.isInfixOf "health" $ rawPathInfo req
        then toLogStr B.empty
        else formatAsJSON date req status responseSize duration reqBody response


        This seems to work fine. However, I'd still like to know if there's a better way.






        share|improve this answer













        I created a custom formatter in the following way:



        -- | Wai Application Middleware logger
        jsonRequestLogger :: IO Middleware
        jsonRequestLogger = mkRequestLogger
        $ def { outputFormat = CustomOutputFormatWithDetails dontLogHealthEndpoint }


        dontLogHealthEndpoint :: OutputFormatterWithDetails
        dontLogHealthEndpoint date req status responseSize duration reqBody response =
        if B.isInfixOf "health" $ rawPathInfo req
        then toLogStr B.empty
        else formatAsJSON date req status responseSize duration reqBody response


        This seems to work fine. However, I'd still like to know if there's a better way.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Jan 3 at 4:41









        erewokerewok

        5,42422234




        5,42422234
































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