Application.hs

{-# OPTIONS_GHC -fno-warn-orphans #-}
module Application
    ( getApplicationDev
    , appMain
    , develMain
    , makeFoundation
    ) where

import Control.Monad.Logger                 (liftLoc, runLoggingT)
import Database.Persist.Postgresql          (createPostgresqlPool, pgConnStr,
                                             pgPoolSize, runSqlPool)
import Import
import Language.Haskell.TH.Syntax           (qLocation)
import Network.Wai.Handler.Warp             (Settings, defaultSettings,
                                             defaultShouldDisplayException,
                                             runSettings, setHost,
                                             setOnException, setPort)
import Network.Wai.Middleware.RequestLogger (Destination (Logger),
                                             IPAddrSource (..),
                                             OutputFormat (..), destination,
                                             mkRequestLogger, outputFormat)
import System.Log.FastLogger                (defaultBufSize, newStdoutLoggerSet,
                                             toLogStr)
import Settings.Heroku                      (herokuDbConf)

import Handler.Common
import Handler.Home
import Handler.BlogPost
import Handler.Category
import Handler.Tag
import Handler.User

mkYesodDispatch "App" resourcesApp

makeFoundation :: AppSettings -> IO App
makeFoundation appSettings = do
    appHttpManager <- newManager
    appLogger <- newStdoutLoggerSet defaultBufSize >>= makeYesodLogger
    appStatic <-
        (if appMutableStatic appSettings then staticDevel else static)
        (appStaticDir appSettings)

    let mkFoundation appConnPool = App {..}
        tempFoundation = mkFoundation $ error "connPool forced in tempFoundation"
        logFunc = messageLoggerSource tempFoundation appLogger

    dbConf <- if appHeroku appSettings then herokuDbConf else return $ appDatabaseConf appSettings
    pool <- flip runLoggingT logFunc $ createPostgresqlPool
        (pgConnStr  dbConf)
        (pgPoolSize dbConf)

    runLoggingT (runSqlPool (runMigration migrateAll) pool) logFunc

    return $ mkFoundation pool

-- | Convert our foundation to a WAI Application by calling @toWaiAppPlain@ and
-- applyng some additional middlewares.
makeApplication :: App -> IO Application
makeApplication foundation = do
    logWare <- mkRequestLogger def
        { outputFormat =
            if appDetailedRequestLogging $ appSettings foundation
                then Detailed True
                else Apache
                        (if appIpFromHeader $ appSettings foundation
                            then FromFallback
                            else FromSocket)
        , destination = Logger $ loggerSet $ appLogger foundation
        }

    -- Create the WAI application and apply middlewares
    appPlain <- toWaiAppPlain foundation
    return $ logWare $ defaultMiddlewaresNoLogging appPlain

-- | Warp settings for the given foundation value.
warpSettings :: App -> Settings
warpSettings foundation =
      setPort (appPort $ appSettings foundation)
    $ setHost (appHost $ appSettings foundation)
    $ setOnException (\_req e ->
        when (defaultShouldDisplayException e) $ messageLoggerSource
            foundation
            (appLogger foundation)
            $(qLocation >>= liftLoc)
            "yesod"
            LevelError
            (toLogStr $ "Exception from Warp: " ++ show e))
      defaultSettings

-- | For yesod devel, return the Warp settings and WAI Application.
getApplicationDev :: IO (Settings, Application)
getApplicationDev = do
    settings <- loadAppSettings [configSettingsYml] [] useEnv
    foundation <- makeFoundation settings
    app <- makeApplication foundation
    wsettings <- getDevSettings $ warpSettings foundation
    return (wsettings, app)

-- | main function for use by yesod devel
develMain :: IO ()
develMain = develMainHelper getApplicationDev

-- | The @main@ function for an executable running this site.
appMain :: IO ()
appMain = do
    -- Get the settings from all relevant sources
    settings <- loadAppSettingsArgs
        -- fall back to compile-time values, set to [] to require values at runtime
        [configSettingsYmlValue]

        -- allow environment variables to override
        useEnv

    -- Generate the foundation from the settings
    foundation <- makeFoundation settings

    -- Generate a WAI Application from the foundation
    app <- makeApplication foundation

    -- Run the application with Warp
    runSettings (warpSettings foundation) app