Test and contract test the s3 interface

default.nix

@@ -1,8 +1,9 @@
 { mkDerivation, aeson, amazonka, amazonka-s3, base, bytestring
-, conduit, cryptonite, dhall, directory, either, ekg-core, filepath
-, generic-lens, hedgehog, hspec, hspec-hedgehog, JuicyPixels
-, JuicyPixels-extra, lens, lib, mtl, servant, servant-server
-, sqlite-simple, text, unliftio, unordered-containers, vector, wai
+, conduit, containers, cryptonite, dhall, directory, either
+, ekg-core, filepath, generic-lens, hashable, hedgehog, hspec
+, hspec-hedgehog, JuicyPixels, JuicyPixels-extra, lens, lib, mtl
+, servant, servant-server, sqlite-simple, temporary, text
+, transformers, unliftio, unordered-containers, vector, wai
 , wai-middleware-metrics, warp
 }:
 mkDerivation {
@@ -20,7 +21,10 @@ mkDerivation {
   ];
   executableHaskellDepends = [ base ];
   testHaskellDepends = [
-    aeson base dhall either hedgehog hspec hspec-hedgehog
+    aeson amazonka amazonka-s3 base bytestring conduit containers
+    cryptonite dhall either filepath generic-lens hashable hedgehog
+    hspec hspec-hedgehog lens temporary text transformers
+    unordered-containers
   ];
   license = lib.licenses.bsd3;
   mainProgram = "image-backup";

image-backup.cabal

@@ -64,6 +64,7 @@ library
                       Config
                       Config.S3
                       Config.Watcher
+                      S3.Interface
                       Image.Fingerprint
 
     -- Modules included in this library but not exported.
@@ -140,6 +141,7 @@ test-suite image-backup-test
 
     -- Modules included in this executable, other than Main.
     other-modules: Test.Config
+                   Test.S3.Interface
 
     -- LANGUAGE extensions used by modules in this package.
     -- other-extensions:
@@ -162,3 +164,17 @@ test-suite image-backup-test
                  , dhall
                  , aeson
                  , either
+                 , temporary
+                 , cryptonite
+                 , conduit
+                 , text
+                 , filepath
+                 , bytestring
+                 , containers
+                 , unordered-containers
+                 , hashable
+                 , transformers
+                 , amazonka
+                 , lens
+                 , generic-lens
+                 , amazonka-s3

src/MyLib.hs

@@ -21,11 +21,10 @@ import System.FilePath (isExtensionOf, takeBaseName)
 import qualified Data.Conduit.Combinators as C
 import Crypto.Hash (HashAlgorithm, Digest, SHA256)
 import qualified Crypto.Hash as Crypto
-import Amazonka (newEnv, Region(..), Env, Env'(..), setEndpoint, runResourceT, send, chunkedFile, defaultChunkSize)
-import Amazonka.Auth (discover)
+import Amazonka (Env, runResourceT, send, chunkedFile, defaultChunkSize)
 import qualified Amazonka.S3 as S3
 import qualified Data.Text as T
-import Control.Lens (view, set, (&), re)
+import Control.Lens (view, set, (&), (^.))
 import Data.Generics.Labels ()
 import Control.Monad (void, forever)
 import Data.HashMap.Strict (HashMap)
@@ -34,13 +33,13 @@ import qualified Data.HashMap.Strict as HM
 import System.Environment (getEnv)
 import qualified Dhall
 import Config (Config)
-import Data.Text.Strict.Lens (utf8)
 import Config.Watcher (Seconds)
 import Control.Concurrent (threadDelay)
 import UnliftIO (forConcurrently_)
 import Data.Word (Word64)
 import Image.Fingerprint (dhash)
 import Data.Maybe (catMaybes)
+import qualified S3.Interface
 
 newtype Routes route
   = Routes { _getMetrics :: route :- MetricsRoute }
@@ -86,28 +85,24 @@ analyze = C.mapM (\p -> Image p <$> hash p <*> fingerprint p)
     fingerprint = fmap (either (const Nothing) Just) . liftIO . dhash
 
 
-watcher :: Env -> S3.BucketName -> FilePath -> Seconds -> IO ()
-watcher env bucket path delay = forever $ do
+watcher :: S3.Interface.S3Interface -> FilePath -> Seconds -> IO ()
+watcher int path delay = forever $ do
   runResourceT $ runConduit $ scan path (isExtensionOf ".jpg")
         .| analyze
         .| C.iterM (liftIO . print)
-        .| C.mapM_ (void . liftIO . uploadImage env bucket)
+        .| C.map (\img -> (imagePath img, imageToMetadata img))
+        .| C.mapM_ (void . liftIO . uncurry (S3.Interface.putFile int))
   threadDelay (fromIntegral (view #seconds delay) * 100_000)
 
 someFunc :: IO ()
 someFunc = do
   confPath <- getEnv "CONFIG_PATH"
   conf <- Dhall.inputFile (Dhall.auto @Config) confPath
-  discoveredEnv <- newEnv discover
-  let env = discoveredEnv
-        { region = Region' $ view (#s3 . #region) conf
-        , overrides = setEndpoint True (view (#s3 . #endpoint . re utf8) conf) 443
-        }
-      bucket = S3.BucketName (view (#s3 . #bucket) conf)
+  s3Interface <- S3.Interface.buildInterface (conf ^. #s3)
   store <- newStore
   waiMetrics <- registerWaiMetrics store
   registerGcMetrics store
-  let watchers = [watcher env bucket path (view (#watcher . #period) conf) | path <- view (#watcher . #directories) conf]
+  let watchers = [watcher s3Interface path (view (#watcher . #period) conf) | path <- view (#watcher . #directories) conf]
       actions = ( runSettings settings (metrics waiMetrics $ app store) ) : watchers
   forConcurrently_ actions id
   -- runSettings settings (metrics waiMetrics $ app store)

src/S3/Interface.hs

@@ -0,0 +1,65 @@
+{-# LANGUAGE OverloadedLabels #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+
+module S3.Interface where
+
+import Data.HashMap.Strict (HashMap)
+import Data.Text (Text)
+import Config.S3 (ConfigS3)
+import Amazonka (newEnv, Region(..), Env, Env'(..), setEndpoint, runResourceT, send, chunkedFile, defaultChunkSize, discover, sinkBody, hashedFile, RequestBody (..))
+import qualified Amazonka.S3 as S3
+import Control.Lens (view, re, (&), set)
+import Data.Text.Strict.Lens (utf8)
+import Data.Generics.Labels ()
+import qualified Data.Text as T
+import System.FilePath (takeBaseName, (</>))
+import qualified Data.Conduit.Combinators as C
+
+type Metadata = HashMap Text Text
+type Key = Text
+
+data S3Interface = S3Interface
+  { putFile :: FilePath -> Metadata -> IO Key
+  -- ^ Upload a file from path
+  , getFile :: Key -> FilePath -> IO FilePath
+  -- ^ Download a file to a given root
+  , getMetadata :: Key -> IO Metadata
+  -- ^ Fetch the metadata
+  }
+
+buildInterface :: ConfigS3 -> IO S3Interface
+buildInterface s3Conf = do
+  discoveredEnv <- newEnv discover
+  let env = discoveredEnv
+        { region = Region' $ view #region s3Conf
+        , overrides = setEndpoint True (view (#endpoint . re utf8) s3Conf) 443
+        }
+      bucket = S3.BucketName (view #bucket s3Conf)
+  pure S3Interface
+    { putFile = uploadFile env bucket
+    , getFile = downloadFile env bucket
+    , getMetadata = fetchMeta env bucket
+    }
+  where
+    uploadFile :: Env -> S3.BucketName -> FilePath -> Metadata -> IO Key
+    uploadFile env bucket path metadata = do
+      obj <- Hashed <$> hashedFile path
+      runResourceT $ do
+        let putObj = S3.newPutObject bucket (S3.ObjectKey key) obj & set #metadata metadata
+            key = T.pack . takeBaseName $ path
+        _ <- send env putObj
+        pure key
+    fetchMeta :: Env -> S3.BucketName -> Key -> IO Metadata
+    fetchMeta env bucket key = do
+      runResourceT $ do
+        let getObjHead = S3.newHeadObject bucket (S3.ObjectKey key)
+        view #metadata <$> send env getObjHead
+    downloadFile :: Env -> S3.BucketName -> Key -> FilePath -> IO FilePath
+    downloadFile env bucket key root = do
+      let getObj = S3.newGetObject bucket (S3.ObjectKey key)
+      runResourceT $ do
+        x <- view #body <$> send env getObj
+        let path = root </> T.unpack key
+        _ <- sinkBody x (C.sinkFileBS path)
+        pure path

test/Main.hs

@@ -1,8 +1,14 @@
 module Main (main) where
 
 import qualified Test.Config
+import qualified Test.S3.Interface
 import Test.Hspec (hspec)
+import System.Environment (lookupEnv)
+import qualified Dhall
 
 main :: IO ()
-main = hspec $ do
-  Test.Config.spec
+main = do
+  config <- lookupEnv "TEST_CONFIG_PATH" >>= maybe (pure Nothing) (fmap Just . Dhall.inputFile Dhall.auto)
+  hspec $ do
+    Test.Config.spec
+    Test.S3.Interface.spec config

test/Test/S3/Interface.hs

@@ -0,0 +1,140 @@
+{-# LANGUAGE TypeApplications #-}
+module Test.S3.Interface where
+
+import Data.Generics.Labels ()
+import Control.Monad.Trans.Cont
+import Test.Hspec
+import Test.Hspec.Hedgehog
+import qualified Hedgehog.Gen as Gen
+import qualified Hedgehog.Range as Range
+import S3.Interface
+import qualified Data.Conduit.Combinators as C
+import Conduit ((.|), runConduit, runResourceT, liftIO)
+import qualified Data.Text as T
+import System.FilePath (takeBaseName, (</>), (<.>))
+import qualified Data.ByteString.Char8 as BC
+import Data.Map (Map)
+import Data.HashMap.Strict (HashMap)
+import qualified Data.Map.Strict as M
+import qualified Data.HashMap.Strict as HM
+import Data.Hashable (Hashable)
+import Data.Text (Text)
+import qualified Crypto.Random as Random
+import MyLib (hash)
+import System.IO.Temp (withSystemTempDirectory)
+import Crypto.Hash.Algorithms (SHA256)
+import Config.S3 (ConfigS3)
+import Crypto.Hash (Digest)
+
+withTempDir :: FilePath -> ContT r IO FilePath
+withTempDir path = ContT (withSystemTempDirectory path)
+
+-- XXX: Temporarily have the model just here
+buildModel :: FilePath -> IO S3Interface
+buildModel root =
+  pure S3Interface
+  { putFile = \path mt -> do
+      let key = T.pack . takeBaseName $ path
+      runResourceT $ do
+        runConduit $ C.sourceFileBS path .| C.sinkFileBS (root </> T.unpack key)
+        liftIO $ BC.writeFile (root </> T.unpack key <.> "metadata") (BC.pack $ show mt)
+      pure key
+  , getFile = \key outroot -> do
+      let outpath = outroot </> T.unpack key
+          inpath = root </> T.unpack key
+      runResourceT $ runConduit $ C.sourceFileBS inpath .| C.sinkFileBS outpath
+      pure outpath
+  , getMetadata = \key -> do
+      let path = root </> T.unpack key <.> "metadata"
+      read . BC.unpack <$> BC.readFile path
+  }
+
+genMetadata :: Gen Metadata
+genMetadata = convert <$> Gen.map (Range.linear 0 5) ((,) <$> text <*> text)
+  where
+    convert :: Hashable a => Map a b -> HashMap a b
+    convert = HM.fromList . M.toList
+    text = Gen.text (Range.linear 1 32) Gen.alpha
+
+data File = File { name :: Text, chunks :: Int, metadata :: Metadata }
+  deriving Show
+
+genFile :: Gen File
+genFile = File
+  <$> Gen.text (Range.linear 1 32) Gen.alphaNum
+  <*> Gen.integral (Range.linear 0 8192)
+  <*> genMetadata
+
+data FileCommand
+  = PutFile File
+  | ReadFile Int
+  | ReadMetadata Int
+  deriving Show
+
+genCommand :: Gen FileCommand
+genCommand = Gen.choice
+  [ PutFile <$> genFile
+  , ReadFile <$> Gen.integral (Range.linear 0 1000)
+  , ReadMetadata <$> Gen.integral (Range.linear 0 1000)
+  ]
+
+
+write :: FilePath -> File -> IO FilePath
+write root f = do
+  let path = root </> T.unpack (name f)
+  runResourceT $ runConduit $ C.replicateM (chunks f) (liftIO $ Random.getRandomBytes 256) .| C.sinkFileBS path
+  pure path
+
+specGetPut :: PropertyT IO ()
+specGetPut = do
+  file <- forAll genFile
+  (wanted, got) <- liftIO $ flip runContT pure $ do
+    root <- withTempDir "test-getput-in"
+    modelroot <- withTempDir "test-getput-model"
+    downloadroot <- withTempDir "test-getput-download"
+    liftIO $ do
+      interface <- buildModel modelroot
+      inpath <- write root file
+      key <- putFile interface inpath (metadata file)
+      outpath <- getFile interface key downloadroot
+      (,) <$> hash @SHA256 inpath <*> hash @SHA256 outpath
+  wanted === got
+
+data Result = Result
+  { resultKey :: Text
+  , resultHash :: Digest SHA256
+  , resultOriginHash :: Digest SHA256
+  }
+  deriving (Show, Eq)
+
+specGetPutS3 :: ConfigS3 -> PropertyT IO ()
+specGetPutS3 config = do
+  file <- forAll genFile
+  annotateShow file
+  (wanted, got) <- liftIO $ flip runContT pure $ do
+    root <- withTempDir "test-getput-in"
+    modelroot <- withTempDir "test-getput-model"
+    downloadroot <- withTempDir "test-getput-download"
+    liftIO $ do
+      inpath <- write root file
+      let mt = metadata file
+      modelInt <- buildModel modelroot
+      s3Int <- buildInterface config
+      (,) <$> create modelInt downloadroot inpath mt <*> create s3Int downloadroot inpath mt
+  wanted === got
+  where
+    create interface downloadroot inpath mt = do
+      key <- putFile interface inpath mt
+      s3path <- getFile interface key downloadroot
+      Result <$> pure key <*> hash s3path <*> hash inpath
+
+-- Contract test for the interface
+
+spec :: Maybe ConfigS3 -> Spec
+spec mConfig =
+  describe "Contract test between S3 and the model" $ do
+    context "Model" $ do
+      it "satisfies the get-put property for content" $ hedgehog specGetPut
+    flip (maybe (pure ())) mConfig $ \config -> do
+      context "S3" $ do
+        it "satisfies the get-put property for content" $ hedgehog (specGetPutS3 config)