bugfix: fix wrong partial Response sender access

- replaces improper record field access of `sender`, only existing in a
  Request, by `senderID` of a Response
- fixes the resulting exception-crash
- adds new function that enqueues a verification mark and timestamp bump
  of an existing cache entry

Hash2Pub.cabal

@@ -47,7 +47,7 @@ extra-source-files:  CHANGELOG.md
 
 common deps
   build-depends:       base ^>=4.12.0.0, containers ^>=0.6.0.1, bytestring, utf8-string ^>=1.0.1.1, network ^>=2.8.0.1, time ^>=1.8.0.2, cmdargs ^>= 0.10, cryptonite ^>= 0.25, memory, async, stm, asn1-encoding, asn1-types, asn1-parse, publicsuffix, network-byte-order, safe, iproute, mtl, random, servant, servant-server, servant-client, warp, text, unordered-containers, hashable, unicode-transforms, http-client, http-types, unbounded-delays
-  ghc-options:         -Wall
+  ghc-options:         -Wall -Wpartial-fields
 
 
 

src/Hash2Pub/DHTProtocol.hs

@@ -658,8 +658,7 @@ requestStabilise ns neighbour = do
                                                       )
                                                       ([],[]) respSet
             -- update successfully responded neighbour in cache
-            now <- getPOSIXTime
-            maybe (pure ()) (\p -> queueAddEntries (Identity $ RemoteCacheEntry (sender p) now) ns) $ headMay (Set.elems respSet)
+            maybe (pure ()) (\p -> queueUpdateVerifieds (Identity $ senderID p) ns) $ headMay (Set.elems respSet)
             pure $ if null responsePreds && null responseSuccs
                       then Left "no neighbours returned"
                       else Right (responsePreds, responseSuccs)
@@ -826,6 +825,18 @@ queueDeleteEntry :: NodeID
                  -> IO ()
 queueDeleteEntry toDelete = queueDeleteEntries $ Identity toDelete
 
+
+-- | enqueue the timestamp update and verification marking of an entry in the
+-- global 'NodeCache'.
+queueUpdateVerifieds :: Foldable c
+                     => c NodeID
+                     -> LocalNodeState s
+                     -> IO ()
+queueUpdateVerifieds nIds ns = do
+    now <- getPOSIXTime
+    forM_ nIds $ \nid' -> atomically $ writeTQueue (cacheWriteQueue ns) $
+        markCacheEntryAsVerified (Just now) nid'
+
 -- | retry an IO action at most *i* times until it delivers a result
 attempts :: Int             -- ^ number of retries *i*
          -> IO (Maybe a)    -- ^ action to retry