135 lines
5.2 KiB
Haskell
135 lines
5.2 KiB
Haskell
-- | Settings are centralized, as much as possible, into this file. This
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-- includes database connection settings, static file locations, etc.
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-- In addition, you can configure a number of different aspects of Yesod
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-- by overriding methods in the Yesod typeclass. That instance is
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-- declared in the Foundation.hs file.
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module Settings where
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import ClassyPrelude.Yesod
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import Control.Exception (throw)
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import Data.Aeson (Result (..), fromJSON, withObject, (.!=),
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(.:?))
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import Data.FileEmbed (embedFile)
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import Data.Yaml (decodeEither')
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import Database.Persist.Postgresql (PostgresConf)
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import Language.Haskell.TH.Syntax (Exp, Name, Q)
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import Network.Wai.Handler.Warp (HostPreference)
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import Yesod.Default.Config2 (applyEnvValue, configSettingsYml)
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import Yesod.Default.Util (WidgetFileSettings, widgetFileNoReload,
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widgetFileReload)
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-- | Runtime settings to configure this application. These settings can be
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-- loaded from various sources: defaults, environment variables, config files,
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-- theoretically even a database.
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data AppSettings = AppSettings
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{ appStaticDir :: String
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-- ^ Directory from which to serve static files.
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, appDatabaseConf :: PostgresConf
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-- ^ Configuration settings for accessing the database.
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, appRoot :: Text
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-- ^ Base for all generated URLs.
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, appHost :: HostPreference
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-- ^ Host/interface the server should bind to.
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, appPort :: Int
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-- ^ Port to listen on
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, appIpFromHeader :: Bool
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-- ^ Get the IP address from the header when logging. Useful when sitting
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-- behind a reverse proxy.
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, appDetailedRequestLogging :: Bool
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-- ^ Use detailed request logging system
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, appShouldLogAll :: Bool
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-- ^ Should all log messages be displayed?
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, appReloadTemplates :: Bool
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-- ^ Use the reload version of templates
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, appMutableStatic :: Bool
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-- ^ Assume that files in the static dir may change after compilation
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, appSkipCombining :: Bool
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-- ^ Perform no stylesheet/script combining
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-- Example app-specific configuration values.
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, appCopyright :: Text
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-- ^ Copyright text to appear in the footer of the page
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, appAnalytics :: Maybe Text
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-- ^ Google Analytics code
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}
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instance FromJSON AppSettings where
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parseJSON = withObject "AppSettings" $ \o -> do
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let defaultDev =
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#if DEVELOPMENT
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True
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#else
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False
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#endif
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appStaticDir <- o .: "static-dir"
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appDatabaseConf <- o .: "database"
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appRoot <- o .: "approot"
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appHost <- fromString <$> o .: "host"
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appPort <- o .: "port"
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appIpFromHeader <- o .: "ip-from-header"
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appDetailedRequestLogging <- o .:? "detailed-logging" .!= defaultDev
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appShouldLogAll <- o .:? "should-log-all" .!= defaultDev
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appReloadTemplates <- o .:? "reload-templates" .!= defaultDev
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appMutableStatic <- o .:? "mutable-static" .!= defaultDev
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appSkipCombining <- o .:? "skip-combining" .!= defaultDev
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appCopyright <- o .: "copyright"
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appAnalytics <- o .:? "analytics"
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return AppSettings {..}
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-- | Settings for 'widgetFile', such as which template languages to support and
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-- default Hamlet settings.
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--
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-- For more information on modifying behavior, see:
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--
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-- https://github.com/yesodweb/yesod/wiki/Overriding-widgetFile
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widgetFileSettings :: WidgetFileSettings
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widgetFileSettings = def
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-- | How static files should be combined.
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combineSettings :: CombineSettings
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combineSettings = def
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-- The rest of this file contains settings which rarely need changing by a
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-- user.
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widgetFile :: String -> Q Exp
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widgetFile = (if appReloadTemplates compileTimeAppSettings
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then widgetFileReload
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else widgetFileNoReload)
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widgetFileSettings
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-- | Raw bytes at compile time of @config/settings.yml@
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configSettingsYmlBS :: ByteString
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configSettingsYmlBS = $(embedFile configSettingsYml)
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-- | @config/settings.yml@, parsed to a @Value@.
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configSettingsYmlValue :: Value
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configSettingsYmlValue = either throw id $ decodeEither' configSettingsYmlBS
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-- | A version of @AppSettings@ parsed at compile time from @config/settings.yml@.
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compileTimeAppSettings :: AppSettings
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compileTimeAppSettings =
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case fromJSON $ applyEnvValue False mempty configSettingsYmlValue of
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Error e -> error e
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Success settings -> settings
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-- The following two functions can be used to combine multiple CSS or JS files
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-- at compile time to decrease the number of http requests.
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-- Sample usage (inside a Widget):
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--
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-- > $(combineStylesheets 'StaticR [style1_css, style2_css])
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combineStylesheets :: Name -> [Route Static] -> Q Exp
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combineStylesheets = combineStylesheets'
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(appSkipCombining compileTimeAppSettings)
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combineSettings
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combineScripts :: Name -> [Route Static] -> Q Exp
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combineScripts = combineScripts'
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(appSkipCombining compileTimeAppSettings)
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combineSettings
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