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{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Application (
app
) where
import Prelude hiding (id)
import Control.Monad.Trans (liftIO)
import Data.Aeson (ToJSON)
import Data.Default.Class (def)
import Data.List (sort)
import Data.Pool (Pool, withResource)
import Data.Text.Lazy (Text)
import Database.MySQL.Simple (Connection, query_)
import GHC.Generics (Generic)
import Network.HTTP.Types (ok200, notFound404, StdMethod(HEAD))
import Network.Wai (Application, Middleware)
import Network.Wai.Middleware.RequestLogger (Destination(Handle),
mkRequestLogger, RequestLoggerSettings(destination, outputFormat),
OutputFormat(CustomOutputFormat))
import Network.Wai.Middleware.Static (addBase, hasPrefix, staticPolicy, (>->))
import System.IO (stderr)
import Web.Scotty (ScottyM, ActionM, middleware, json, file, addroute, get,
status, text, param, scottyApp)
import qualified Data.HashMap.Lazy as HM
import LogFormat (logFormat)
type Pools = HM.HashMap Text (Pool Connection)
app :: Pools -> FilePath -> IO Application
app ps f = do
logger <- mkRequestLogger def{ destination = Handle stderr
, outputFormat = CustomOutputFormat logFormat }
scottyApp (myProcess ps logger f)
myProcess :: Pools -> Middleware -> FilePath -> ScottyM ()
myProcess ps logger dataDir = do
middleware logger
middleware $ staticPolicy (hasPrefix "static" >-> addBase dataDir)
get "/" $ file (dataDir ++ "/" ++ "index.html")
get "/serverlist.json" $ json (sort $ HM.keys ps)
get "/server/:server/processlist.json" $ apiGetProcessList ps
-- Used by client to see which servers are really allowed by Sproxy
addroute HEAD "/server/:server/processlist.json" $ apiCanProcessList ps
data Process = Process {
id :: Int
, user :: Text
, host :: Text
, db :: Maybe Text
, command :: Text
, time :: Int
, state :: Maybe Text
, info :: Text
} deriving (Generic)
instance ToJSON Process
apiCanProcessList :: Pools -> ActionM ()
apiCanProcessList ps = do
server <- param "server"
case HM.lookup server ps of
Nothing -> status notFound404 >> text server
Just _ -> status ok200
apiGetProcessList :: Pools -> ActionM ()
apiGetProcessList ps = do
server <- param "server"
case HM.lookup server ps of
Nothing -> status notFound404 >> text server
Just p -> do
res <- withDB p $ \c ->
query_ c "SELECT \
\id, user, host, db, command, time, state, info \
\FROM information_schema.processlist \
\WHERE info IS NOT NULL \
\ORDER BY time DESC, id ASC"
json $ map (\(id, user, host, db, command, time, state, info) -> Process {..}) res
withDB :: Pool Connection -> (Connection -> IO a) -> ActionM a
withDB p a = liftIO $ withResource p (liftIO . a)
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