minio-hs-1.3.0: examples/BucketExists.hs

#!/usr/bin/env stack
-- stack --resolver lts-11.1 runghc --package minio-hs

--
-- MinIO Haskell SDK, (C) 2017, 2018 MinIO, Inc.
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--

{-# Language OverloadedStrings #-}
import Network.Minio

import Control.Monad.IO.Class (liftIO)
import Prelude

-- | The following example uses minio's play server at
-- https://play.min.io:9000.  The endpoint and associated
-- credentials are provided via the libary constant,
--
-- > minioPlayCI :: ConnectInfo
--

main :: IO ()
main = do
  let bucket = "missingbucket"

  res1 <- runMinio minioPlayCI $ do
    foundBucket <- bucketExists bucket
    liftIO $ putStrLn $ "Does " ++ show bucket ++ " exist? - " ++ show foundBucket

  case res1 of
    Left e -> putStrLn $ "bucketExists failed." ++ show e
    Right () -> return ()