Build with GHC 8.8 (#137)

* Fix to build with GHC 8.8 and fix error handling bug

To work with the addition of MonadFail constraint to parseTimeM in the time
library, the underlying monad was changed from Either to Maybe as it has a
MonadFail instance.

* Update build to run tests against local minio server

.travis.yml

@@ -4,7 +4,7 @@ language: haskell
 git:
   depth: 5
 
-cabal: "2.4"
+cabal: "3.0"
 
 cache:
   directories:
@@ -19,11 +19,21 @@ matrix:
   - ghc: 8.2.2
   - ghc: 8.4.4
   - ghc: 8.6.5
+  - ghc: 8.8.1
 
   # Stack
   - ghc: 8.6.5
     env: STACK_YAML="$TRAVIS_BUILD_DIR/stack.yaml"
 
+before_install:
+  - sudo apt-get install devscripts
+  - mkdir /tmp/minio /tmp/certs
+  - (cd /tmp/minio; wget https://dl.min.io/server/minio/release/linux-amd64/minio; chmod +x ./minio)
+  - (cd /tmp/certs; openssl   req   -newkey rsa:2048 -nodes   -keyout private.key   -x509 -days 36500 -out public.crt   -subj "/C=US/ST=NRW/L=Earth/O=CompanyName/OU=IT/CN=localhost/emailAddress=email@example.com")
+  - sudo cp /tmp/certs/public.crt /usr/local/share/ca-certificates/
+  - sudo update-ca-certificates
+  - MINIO_ACCESS_KEY=minio MINIO_SECRET_KEY=minio123 /tmp/minio/minio server --quiet --certs-dir /tmp/certs data 2>&1 > minio.log &
+
 install:
   - |
     if [ -z "$STACK_YAML" ]; then
@@ -43,9 +53,9 @@ install:
 script:
   - |
     if [ -z "$STACK_YAML" ]; then
-      cabal new-test --enable-tests
+      MINIO_LOCAL=1 MINIO_SECURE=1 cabal new-test --enable-tests
     else
-      stack test --system-ghc
+      MINIO_LOCAL=1 MINIO_SECURE=1 stack test --system-ghc
     fi
 
 notifications:

src/Network/Minio/Data.hs

@@ -21,10 +21,9 @@
 module Network.Minio.Data where
 
 import qualified Conduit                      as C
-import           Control.Concurrent.MVar      (MVar)
 import qualified Control.Concurrent.MVar      as M
-import           Control.Monad.IO.Unlift      (MonadUnliftIO, UnliftIO (..),
+import           Control.Monad.IO.Unlift      (UnliftIO (..), askUnliftIO,
-                                               askUnliftIO, withUnliftIO)
+                                               withUnliftIO)
 import           Control.Monad.Trans.Resource
 import qualified Data.Aeson                   as A
 import qualified Data.ByteArray               as BA

src/Network/Minio/Utils.hs

@@ -26,7 +26,6 @@ import qualified Data.Conduit.Binary           as CB
 import qualified Data.HashMap.Strict           as H
 import qualified Data.List                     as List
 import qualified Data.Text                     as T
-import           Data.Text.Encoding.Error      (lenientDecode)
 import           Data.Text.Read                (decimal)
 import           Data.Time                     (defaultTimeLocale, parseTimeM,
                                                 rfc822DateFormat)

src/Network/Minio/XmlParser.hs

@@ -56,10 +56,10 @@ uncurry6 :: (a -> b -> c -> d -> e -> f -> g) -> (a, b, c, d, e, f) -> g
 uncurry6 f (a, b, c, d, e, g) = f a b c d e g
 
 -- | Parse time strings from XML
-parseS3XMLTime :: (MonadIO m) => Text -> m UTCTime
+parseS3XMLTime :: MonadIO m => Text -> m UTCTime
-parseS3XMLTime = either (throwIO . MErrVXmlParse) return
+parseS3XMLTime t =
-               . parseTimeM True defaultTimeLocale s3TimeFormat
+    maybe (throwIO $ MErrVXmlParse $ "timestamp parse failure: " <> t) return $
-               . T.unpack
+    parseTimeM True defaultTimeLocale s3TimeFormat $ T.unpack t
 
 parseDecimal :: (MonadIO m, Integral a) => Text -> m a
 parseDecimal numStr = either (throwIO . MErrVXmlParse . show) return $

stack.yaml

@@ -15,7 +15,7 @@
 # resolver:
 #  name: custom-snapshot
 #  location: "./custom-snapshot.yaml"
-resolver: lts-13.1
+resolver: lts-14.6
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.

test/LiveServer.hs

@@ -77,6 +77,15 @@ mkRandFile size = do
 funTestBucketPrefix :: Text
 funTestBucketPrefix = "miniohstest-"
 
+loadTestServer :: IO ConnectInfo
+loadTestServer = do
+    val <- lookupEnv "MINIO_LOCAL"
+    isSecure <- lookupEnv "MINIO_SECURE"
+    return $ case (val, isSecure) of
+      (Just _, Just _) -> setCreds (Credentials "minio" "minio123") "https://localhost:9000"
+      (Just _, Nothing) -> setCreds (Credentials "minio" "minio123") "http://localhost:9000"
+      (Nothing, _) -> minioPlayCI
+
 funTestWithBucket :: TestName
                   -> (([Char] -> Minio ()) -> Bucket -> Minio ()) -> TestTree
 funTestWithBucket t minioTest = testCaseSteps t $ \step -> do
@@ -84,10 +93,7 @@ funTestWithBucket t minioTest = testCaseSteps t $ \step -> do
   bktSuffix <- liftIO $ generate $ Q.vectorOf 10 (Q.choose ('a', 'z'))
   let b = T.concat [funTestBucketPrefix, T.pack bktSuffix]
       liftStep = liftIO . step
-  connInfo <- ( bool minioPlayCI
+  connInfo <- loadTestServer
-                  ( setCreds (Credentials "minio" "minio123") "http://localhost:9000" )
-                  . isJust
-              ) <$> lookupEnv "MINIO_LOCAL"
   ret <- runMinio connInfo $ do
     liftStep $ "Creating bucket for test - " ++ t
     foundBucket <- bucketExists b