ncq:test:ncq:fuckup-recovery1

hbs2-storage-ncq/lib/HBS2/Storage/NCQ.hs

@@ -1,3 +1,4 @@
+{-# Language MultiWayIf #-}
 {-# Language RecordWildCards #-}
 module HBS2.Storage.NCQ where
 
@@ -1115,14 +1116,23 @@ ncqStorageInit_ check path = do
                 <&> fromRight 0
                 <&> fromIntegral
 
-    when (lastSz /= currSz ) do
-      fossilized <- ncqGetNewFossilName ncq0
-      debug $ "NEW FOSSIL FILE" <+> pretty fossilized
-      let fn = takeFileName fossilized
-      let msg = fromString $ show $ "wrong-size" <+> pretty lastSz <+> pretty fn
-      err $ pretty msg
-      ncqWriteError ncq0 msg
-      mv currentName fossilized
+    if | currSz > lastSz -> do
+            fossilized <- ncqGetNewFossilName ncq0
+            debug $ "NEW FOSSIL FILE" <+> pretty fossilized
+            let fn = takeFileName fossilized
+            let msg = fromString $ show $ "wrong-size" <+> pretty lastSz <+> pretty fn
+            err $ pretty msg
+            ncqWriteError ncq0 msg
+            mv currentName fossilized
+            PFS.setFileSize fossilized (fromIntegral lastSz)
+            rm currentSize
+
+       | currSz < lastSz -> do
+            err "current log is broken, removing, data loss"
+            ncqWriteError ncq0 $ "current log is broken, removing, data loss"
+            none
+
+       | otherwise -> none
 
   debug $ "currentFileName" <+> pretty (ncqGetCurrentName_ path ncqGen)
 

hbs2-tests/hbs2-tests.cabal

@@ -1216,8 +1216,10 @@ executable test-ncq
         , network-byte-order
         , text
         , time
+        , tasty-hunit
         , mmap
         , zstd
         , unix
 
 
+

hbs2-tests/test/TestNCQ.hs

@@ -99,6 +99,59 @@ silence = do
   setLoggingOff @NOTICE
   setLoggingOff @TRACE
 
+
+testNCQFuckupRecovery1 :: MonadUnliftIO m
+                       => FilePath
+                       -> m ()
+
+testNCQFuckupRecovery1 prefix = flip runContT pure do
+
+  mkdir prefix
+
+  tmp <- liftIO (Temp.createTempDirectory prefix "ncq-test")
+  let ncqDir   = tmp </> "ncq-test-data"
+
+  ContT $ bracket none $ const do
+    none
+
+  (cur,ha,h0) <- lift $ withNCQ id ncqDir $ \ncq -> do
+    let sto = AnyStorage ncq
+
+    source <- LBS.take (100 * 1024^2) <$> liftIO (LBS.readFile "/dev/urandom")
+
+    let h0 = hashObject @HbSync source
+
+    hash <- runExceptT (writeAsMerkle sto source <&> HashRef)
+               >>= orThrowPassIO @_ @SomeException
+
+    notice $ "stored" <+> pretty hash <+> pretty (LBS.length source)
+
+    pure (ncqGetCurrentName ncq, hash, h0)
+
+  liftIO do
+    ss <- randomRIO (1, 32*1024)
+    shit <- LBS.take ss <$> LBS.readFile "/dev/urandom"
+    BS.appendFile cur (LBS.toStrict shit)
+    newSize <- getFileSize cur
+    notice $ "CURRENT-FILE" <+> pretty cur <+> "successfully corrupted" <+> pretty newSize
+
+  notice $ "CURRENT-FILE" <+> pretty cur
+
+  lift $ withNCQ id ncqDir $ \ncq -> do
+    notice $ "REOPEN STORAGE"
+    let sto = AnyStorage ncq
+
+    lbs <- runExceptT (getTreeContents sto ha)
+               >>= orThrowPassIO
+
+    let h1 = hashObject @HbSync lbs
+
+    when (h0 /= h1) do
+      error "corrupted state"
+
+    notice $ "loaded" <+> pretty ha <+> pretty (LBS.length lbs)
+
+
 testNCQ1 :: MonadUnliftIO m
          => Bool
          -> FilePath
@@ -277,6 +330,10 @@ main = do
           _ ->
              setLogging @DEBUG  $ toStderr . logPrefix "[debug] "
 
+        entry $ bindMatch "ncq:test:ncq:fuckup-recovery1" $ nil_ $ \_ -> lift do
+          debug $ "ncq:test:ncq:fuckup-recovery1"
+          testNCQFuckupRecovery1 "./tmp-ncq"
+
         entry $ bindMatch "test:ncq:test1" $ nil_ $ \syn -> lift do
           let (opts, argz) = splitOpts [("-n",1)] syn
           let n = headDef 100 [ x | ListVal [ StringLike "-n", LitIntVal x ] <- opts  ]