tvl-depot/src/App.hs

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
--------------------------------------------------------------------------------
module App where
--------------------------------------------------------------------------------
import Control.Monad.IO.Class (liftIO)
import Control.Monad.Logger (runStderrLoggingT)
import Database.Persist.Sqlite ( ConnectionPool, createSqlitePool
, runSqlPool, runSqlPersistMPool
, runMigration, selectFirst, (==.)
, insert, entityVal)
import Data.String.Conversions (cs)
import Data.Text (Text)
import Network.Wai.Handler.Warp as Warp
import Servant
import API
import Types
--------------------------------------------------------------------------------
server :: ConnectionPool -> Server API
server pool =
userAddH :<|> userGetH
where
userAddH newUser = liftIO $ userAdd newUser
userGetH name = liftIO $ userGet name
userAdd :: User -> IO (Maybe (Key User))
userAdd newUser = flip runSqlPersistMPool pool $ do
exists <- selectFirst [UserName ==. (userName newUser)] []
case exists of
Nothing -> Just <$> insert newUser
Just _ -> return Nothing
userGet :: Text -> IO (Maybe User)
userGet name = flip runSqlPersistMPool pool $ do
mUser <- selectFirst [UserName ==. name] []
return $ entityVal <$> mUser
app :: ConnectionPool -> Application
app pool = serve (Proxy @ API) $ server pool
mkApp :: FilePath -> IO Application
mkApp sqliteFile = do
pool <- runStderrLoggingT $ do
createSqlitePool (cs sqliteFile) 5
runSqlPool (runMigration migrateAll) pool
return $ app pool
run :: FilePath -> IO ()
run sqliteFile =
Warp.run 3000 =<< mkApp sqliteFile