scale request timeout with speedup and pass it directly to function

app/Main.hs

@@ -65,6 +65,8 @@ readConfig = do
           , confJoinAttemptsInterval = 60 * 10^6 `div` speedup
           , confMaxNodeCacheAge = 600 / fromIntegral speedup
           , confResponsePurgeAge = 60 / fromIntegral speedup
+          , confRequestTimeout = 5 * 10^6 `div` speedup
+          , confRequestRetries = 3
                            }
         sConf = ServiceConf {
             confSubscriptionExpiryTime = fromIntegral $ 2*3600 `div` speedup

src/Hash2Pub/DHTProtocol.hs

@@ -488,10 +488,11 @@ requestJoin :: (NodeState a, Service s (RealNodeSTM s)) => a             -- ^ cu
 requestJoin toJoinOn ownStateSTM = do
     ownState <- readTVarIO ownStateSTM
     prn <- readTVarIO $ parentRealNode ownState
-    srcAddr <- confIP . nodeConfig <$> readTVarIO (parentRealNode ownState)
+    nodeConf <- nodeConfig <$> readTVarIO (parentRealNode ownState)
+    let srcAddr = confIP nodeConf
     bracket (mkSendSocket srcAddr (getDomain toJoinOn) (getDhtPort toJoinOn)) close (\sock -> do
         -- extract own state for getting request information
-        responses <- sendRequestTo (\rid -> Request rid (toRemoteNodeState ownState) 1 True Join (Just JoinRequestPayload)) sock
+        responses <- sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (\rid -> Request rid (toRemoteNodeState ownState) 1 True Join (Just JoinRequestPayload)) sock
         (cacheInsertQ, joinedState) <- atomically $ do
             stateSnap <- readTVar ownStateSTM
             let
@@ -584,10 +585,11 @@ sendQueryIdMessages targetID ns lParam targets = do
 
           -- create connected sockets to all query targets and use them for request handling
 
-          srcAddr <- confIP . nodeConfig <$> readTVarIO (parentRealNode ns)
+          nodeConf <- nodeConfig <$> readTVarIO (parentRealNode ns)
+          let srcAddr = confIP nodeConf
           -- ToDo: make attempts and timeout configurable
           queryThreads <- mapM (\resultNode -> async $ bracket (mkSendSocket srcAddr (getDomain resultNode) (getDhtPort resultNode)) close (
-              sendRequestTo (lookupMessage targetID ns Nothing)
+              sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (lookupMessage targetID ns Nothing)
                                                                                                                                    )) targets
           -- ToDo: process results immediately instead of waiting for the last one to finish, see https://stackoverflow.com/a/38815224/9198613
           -- ToDo: exception handling, maybe log them
@@ -635,8 +637,9 @@ requestStabilise :: LocalNodeState s      -- ^ sending node
                  -> RemoteNodeState     -- ^ neighbour node to send to
                  -> IO (Either String ([RemoteNodeState], [RemoteNodeState]))   -- ^ (predecessors, successors) of responding node
 requestStabilise ns neighbour = do
-    srcAddr <- confIP . nodeConfig <$> readTVarIO (parentRealNode ns)
+    nodeConf <- nodeConfig <$> readTVarIO (parentRealNode ns)
-    responses <- bracket (mkSendSocket srcAddr (getDomain neighbour) (getDhtPort neighbour)) close (fmap Right . sendRequestTo (\rid ->
+    let srcAddr = confIP nodeConf
+    responses <- bracket (mkSendSocket srcAddr (getDomain neighbour) (getDhtPort neighbour)) close (fmap Right . sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (\rid ->
         Request {
             requestID = rid
           , sender = toRemoteNodeState ns
@@ -673,13 +676,14 @@ requestLeave :: LocalNodeState s
              -> RemoteNodeState     -- target node
              -> IO (Either String ())   -- error or success
 requestLeave ns doMigration target = do
-    srcAddr <- confIP . nodeConfig <$> readTVarIO (parentRealNode ns)
+    nodeConf <- nodeConfig <$> readTVarIO (parentRealNode ns)
-    let leavePayload = LeaveRequestPayload {
+    let srcAddr = confIP nodeConf
+        leavePayload = LeaveRequestPayload {
         leaveSuccessors = successors ns
       , leavePredecessors = predecessors ns
       , leaveDoMigration = doMigration
                                            }
-    responses <- bracket (mkSendSocket srcAddr (getDomain target) (getDhtPort target)) close (fmap Right . sendRequestTo (\rid ->
+    responses <- bracket (mkSendSocket srcAddr (getDomain target) (getDhtPort target)) close (fmap Right . sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (\rid ->
         Request {
             requestID = rid
           , sender = toRemoteNodeState ns
@@ -701,10 +705,11 @@ requestPing :: LocalNodeState s      -- ^ sending node
                  -> RemoteNodeState     -- ^ node to be PINGed
                  -> IO (Either String [RemoteNodeState])   -- ^ all active vServers of the pinged node
 requestPing ns target = do
-    srcAddr <- confIP . nodeConfig <$> readTVarIO (parentRealNode ns)
+    nodeConf <- nodeConfig <$> readTVarIO (parentRealNode ns)
+    let srcAddr = confIP nodeConf
     responses <- bracket (mkSendSocket srcAddr (getDomain target) (getDhtPort target)) close
         (\sock -> do
-            resp <- sendRequestTo (\rid ->
+            resp <- sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (\rid ->
                 Request {
                     requestID = rid
                   , sender = toRemoteNodeState ns
@@ -740,22 +745,14 @@ requestPing ns target = do
         ) responses
 
 
--- | 'sendRequestToWithParams' with default timeout and retries already specified.
--- Generic function for sending a request over a connected socket and collecting the response.
--- Serialises the message and tries to deliver its parts for a number of attempts within a default timeout.
-sendRequestTo :: (Integer -> FediChordMessage)       -- ^ the message to be sent, still needing a requestID
-              -> Socket                 -- ^ connected socket to use for sending
-              -> IO (Set.Set FediChordMessage)  -- ^ responses
-sendRequestTo = sendRequestToWithParams 5000 3
-
 -- | Generic function for sending a request over a connected socket and collecting the response.
 -- Serialises the message and tries to deliver its parts for a number of attempts within a specified timeout.
-sendRequestToWithParams :: Int                    -- ^ timeout in milliseconds
+sendRequestTo :: Int                    -- ^ timeout in milliseconds
               -> Int                    -- ^ number of retries
               -> (Integer -> FediChordMessage)       -- ^ the message to be sent, still needing a requestID
               -> Socket                 -- ^ connected socket to use for sending
               -> IO (Set.Set FediChordMessage)  -- ^ responses
-sendRequestToWithParams timeoutMillis numAttempts msgIncomplete sock = do
+sendRequestTo timeoutMillis numAttempts msgIncomplete sock = do
     -- give the message a random request ID
     randomID <- randomRIO (0, 2^32-1)
     let
@@ -764,7 +761,7 @@ sendRequestToWithParams timeoutMillis numAttempts msgIncomplete sock = do
     -- create a queue for passing received response messages back, even after a timeout
     responseQ <- newTBQueueIO $ 2*maximumParts  -- keep room for duplicate packets
     -- start sendAndAck with timeout
-    attempts numAttempts . timeout (timeoutMillis*1000) $ sendAndAck responseQ sock requests
+    _ <- attempts numAttempts . timeout (timeoutMillis*1000) $ sendAndAck responseQ sock requests
     -- after timeout, check received responses, delete them from unacked message set/ map and rerun senAndAck with that if necessary.
     recvdParts <- atomically $ flushTBQueue responseQ
     pure $ Set.fromList recvdParts

src/Hash2Pub/FediChord.hs

@@ -223,10 +223,11 @@ tryBootstrapJoining nsSTM = do
 bootstrapQueryId :: LocalNodeStateSTM s -> (String, PortNumber) -> NodeID -> IO (Either String RemoteNodeState)
 bootstrapQueryId nsSTM (bootstrapHost, bootstrapPort) targetID = do
     ns <- readTVarIO nsSTM
-    srcAddr <- confIP . nodeConfig <$> readTVarIO (parentRealNode ns)
+    nodeConf <- nodeConfig <$> readTVarIO (parentRealNode ns)
+    let srcAddr = confIP nodeConf
     bootstrapResponse <- bracket (mkSendSocket srcAddr bootstrapHost bootstrapPort) close (
         -- Initialise an empty cache only with the responses from a bootstrapping node
-        fmap Right . sendRequestTo (lookupMessage targetID ns Nothing)
+        fmap Right . sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (lookupMessage targetID ns Nothing)
                                                                                   )
        `catch` (\e -> pure . Left $ "Error at bootstrap QueryId: " <> displayException (e :: IOException))
 

src/Hash2Pub/FediChordTypes.hs

@@ -423,6 +423,10 @@ data FediChordConf = FediChordConf
     -- ^ maximum age of entries in the node cache, in milliseconds
     , confResponsePurgeAge          :: POSIXTime
     -- ^ maximum age of message parts in response part cache, in seconds
+    , confRequestTimeout            :: Int
+    -- ^ how long to wait until response has arrived, in milliseconds
+    , confRequestRetries            :: Int
+    -- ^ how often re-sending a timed-out request can be retried
     }
     deriving (Show, Eq)