51 lines
1.4 KiB
Haskell
51 lines
1.4 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Main where
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import Control.Applicative
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import Database.PostgreSQL.Simple
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import Network.Wai
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import Network.Wai.Handler.Warp hiding (Connection)
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import Network.HTTP.Types.Status
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import Options.Applicative hiding (columns)
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import PgStructure (printTables, printColumns)
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data AppConfig = AppConfig {
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configDb :: String
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, configPort :: Int }
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argParser :: Parser AppConfig
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argParser = AppConfig
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<$> strOption (long "db" <> short 'd' <> metavar "URI"
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<> help "database uri to expose, e.g. postgres://user:pass@host:port/database")
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<*> option (long "port" <> short 'p' <> metavar "NUMBER" <> value 3000
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<> help "port number on which to run HTTP server")
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main :: IO ()
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main = execParser (info (helper <*> argParser) describe) >>= exposeDb
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where describe = progDesc "create a REST API to an existing Postgres database"
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exposeDb :: AppConfig -> IO ()
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exposeDb conf = do
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Prelude.putStrLn $ "Listening on port " ++ show port
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run port app
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where
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port = configPort conf
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app :: Application
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app req respond =
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case path of
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[] -> respond =<< responseLBS status200 [] <$> (printTables =<< conn)
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[table] -> respond =<< responseLBS status200 [] <$> (printColumns table =<< conn)
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_ -> respond $ responseLBS status404 [] ""
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where
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path = pathInfo req
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conn = connect defaultConnectInfo {
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connectDatabase = "dbapi_test"
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}
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