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include target ID in request to address individual vserver 

- necessary for dispatching the request to a certain vserver
- also refactored request sending to use a common `mkRequest`
- contributes to #2
k-choices
Trolli Schmittlauch 2020-09-19 20:41:58 +02:00
parent 5e745cd035
commit 9bf7365a2c
5 changed files with 42 additions and 60 deletions
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1
FediChord.asn1
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@ -11,6 +11,7 @@ Action ::= ENUMERATED {queryID, join, leave, stabilise, ping, queryLoad}
Request ::= SEQUENCE {
action Action,
requestID INTEGER (0..4294967295), -- arbitrarily restricting to an unsigned 32bit integer
receiverID NodeID,
sender NodeState,
part Partnum, -- part number of this message, starts at 1
finalPart BOOLEAN, -- flag indicating this `part` to be the last of this reuest

6
src/Hash2Pub/ASN1Coding.hs
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@ -227,10 +227,11 @@ encodeQueryResult FORWARD{} = Enumerated 1
encodeMessage :: FediChordMessage -- ^ the 'FediChordMessage to be encoded
-> [ASN1]
encodeMessage
(Request requestID sender part isFinalPart action requestPayload) =
(Request requestID receiverID sender part isFinalPart action requestPayload) =
Start Sequence
: (Enumerated . fromIntegral . fromEnum $ action)
: IntVal requestID
: (IntVal . getNodeID $ receiverID)
: encodeNodeState sender
<> [IntVal part
, Boolean isFinalPart]
@ -274,6 +275,7 @@ parseMessage = do
parseRequest :: Action -> ParseASN1 FediChordMessage
parseRequest action = do
requestID <- parseInteger
receiverID' <- fromInteger <$> parseInteger
sender <- parseNodeState
part <- parseInteger
isFinalPart <- parseBool
@ -286,7 +288,7 @@ parseRequest action = do
Ping -> parsePingRequestPayload
QueryLoad -> parseLoadRequestPayload
pure $ Request requestID sender part isFinalPart action payload
pure $ Request requestID receiverID' sender part isFinalPart action payload
parseResponse :: Integer -> ParseASN1 FediChordMessage
parseResponse requestID = do

70
src/Hash2Pub/DHTProtocol.hs
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@ -15,6 +15,7 @@ module Hash2Pub.DHTProtocol
, Action(..)
, ActionPayload(..)
, FediChordMessage(..)
, mkRequest
, maximumParts
, sendQueryIdMessages
, requestQueryID
@ -484,6 +485,21 @@ respondJoin nsSTM msgSet = do
-- ....... request sending .......
-- | defautl constructor for request messages, fills standard values like
-- part number to avoid code repition
mkRequest :: LocalNodeState s -> NodeID -> Action -> Maybe ActionPayload -> (Integer -> FediChordMessage)
mkRequest ns targetID action pl rid = Request
{ requestID = rid
, receiverID = targetID
, sender = toRemoteNodeState ns
-- part number and final flag can be changed by ASN1 encoder to make packet
-- fit the MTU restrictions
, part = 1
, isFinalPart = True
, action = action
, payload = pl
}
-- | send a join request and return the joined 'LocalNodeState' including neighbours
requestJoin :: (NodeState a, Service s (RealNodeSTM s)) => a -- ^ currently responsible node to be contacted
-> LocalNodeStateSTM s -- ^ joining NodeState
@ -495,7 +511,7 @@ requestJoin toJoinOn ownStateSTM = do
let srcAddr = confIP nodeConf
bracket (mkSendSocket srcAddr (getDomain toJoinOn) (getDhtPort toJoinOn)) close (\sock -> do
-- extract own state for getting request information
responses <- sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (\rid -> Request rid (toRemoteNodeState ownState) 1 True Join (Just JoinRequestPayload)) sock
responses <- sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (mkRequest ownState (getNid toJoinOn) Join (Just JoinRequestPayload)) sock
(cacheInsertQ, joinedState) <- atomically $ do
stateSnap <- readTVar ownStateSTM
let
@ -628,7 +644,7 @@ lookupMessage :: Integral i
-> LocalNodeState s -- ^ sender node state
-> Maybe i -- ^ optionally provide a different l parameter
-> (Integer -> FediChordMessage)
lookupMessage targetID ns lParam = \rID -> Request rID (toRemoteNodeState ns) 1 True QueryID (Just $ pl ns targetID)
lookupMessage targetID ns lParam = mkRequest ns targetID QueryID (Just $ pl ns targetID)
where
pl ns' targetID' = QueryIDRequestPayload { queryTargetID = targetID', queryLBestNodes = maybe (fromIntegral $ lNumBestNodes ns) fromIntegral lParam }
@ -641,16 +657,7 @@ requestStabilise :: LocalNodeState s -- ^ sending node
requestStabilise ns neighbour = do
nodeConf <- nodeConfig <$> readTVarIO (parentRealNode ns)
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
, part = 1
, isFinalPart = False
, action = Stabilise
, payload = Just StabiliseRequestPayload
}
)
responses <- bracket (mkSendSocket srcAddr (getDomain neighbour) (getDhtPort neighbour)) close (fmap Right . sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (mkRequest ns (getNid neighbour) Stabilise (Just StabiliseRequestPayload))
) `catch` (\e -> pure . Left $ displayException (e :: IOException))
either
-- forward IO error messages
@ -685,17 +692,12 @@ requestLeave ns doMigration target = do
, leavePredecessors = predecessors ns
, leaveDoMigration = doMigration
}
responses <- bracket (mkSendSocket srcAddr (getDomain target) (getDhtPort target)) close (fmap Right . sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (\rid ->
Request {
requestID = rid
, sender = toRemoteNodeState ns
, part = 1
, isFinalPart = False
, action = Leave
, payload = Just leavePayload
}
)
) `catch` (\e -> pure . Left $ displayException (e :: IOException))
responses <- bracket
(mkSendSocket srcAddr (getDomain target) (getDhtPort target))
close
(fmap Right
. sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (mkRequest ns (getNid target) Leave (Just leavePayload))
) `catch` (\e -> pure . Left $ displayException (e :: IOException))
either
-- forward IO error messages
(pure . Left)
@ -711,16 +713,7 @@ requestPing ns target = do
let srcAddr = confIP nodeConf
responses <- bracket (mkSendSocket srcAddr (getDomain target) (getDhtPort target)) close
(\sock -> do
resp <- sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (\rid ->
Request {
requestID = rid
, sender = toRemoteNodeState ns
, part = 1
, isFinalPart = False
, action = Ping
, payload = Just PingRequestPayload
}
) sock
resp <- sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (mkRequest ns (getNid target) Ping (Just PingRequestPayload)) sock
(SockAddrInet6 _ _ peerAddr _) <- getPeerName sock
pure $ Right (peerAddr, resp)
) `catch` (\e -> pure . Left $ displayException (e :: IOException))
@ -761,16 +754,7 @@ requestQueryLoad ns upperIdBound target = do
{ loadSegmentUpperBound = upperIdBound
}
responses <- liftIO $ bracket (mkSendSocket srcAddr (getDomain target) (getDhtPort target)) close
(fmap Right . sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (\rid ->
Request {
requestID = rid
, sender = toRemoteNodeState ns
, part = 1
, isFinalPart = False
, action = QueryLoad
, payload = Just loadReqPl
}
)
(fmap Right . sendRequestTo (confRequestTimeout nodeConf) (confRequestRetries nodeConf) (mkRequest ns (getNid target) QueryLoad (Just loadReqPl))
) `catch` (\e -> pure . Left $ displayException (e :: IOException))
responseMsgSet <- liftEither responses
-- throws an error if an exception happened

1
src/Hash2Pub/ProtocolTypes.hs
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@ -21,6 +21,7 @@ data Action = QueryID
data FediChordMessage = Request
{ requestID :: Integer
, receiverID :: NodeID
, sender :: RemoteNodeState
, part :: Integer
, isFinalPart :: Bool

24
test/FediChordSpec.hs
View File

@ -229,14 +229,7 @@ spec = do
, loadRemainingTarget = -1.337
, loadSegmentLowerBound = 12
}
requestTemplate = Request {
requestID = 2342
, sender = exampleNodeState
, part = 1
, isFinalPart = True
, action = undefined
, payload = undefined
}
responseTemplate = Response {
requestID = 2342
, senderID = nid exampleNodeState
@ -245,7 +238,7 @@ spec = do
, action = undefined
, payload = undefined
}
requestWith a pa = requestTemplate {action = a, payload = Just pa}
requestWith senderNode a pa = mkRequest senderNode 4545 a (Just pa) $ 2342
responseWith a pa = responseTemplate {action = a, payload = Just pa}
encodeDecodeAndCheck msg = runParseASN1 parseMessage (encodeMessage msg) `shouldBe` pure msg
@ -256,18 +249,19 @@ spec = do
}
it "messages are encoded and decoded correctly from and to ASN1" $ do
encodeDecodeAndCheck $ requestWith QueryID qidReqPayload
encodeDecodeAndCheck $ requestWith Join jReqPayload
encodeDecodeAndCheck $ requestWith Leave lReqPayload
encodeDecodeAndCheck $ requestWith Stabilise stabReqPayload
encodeDecodeAndCheck $ requestWith Ping pingReqPayload
localNS <- exampleLocalNode
encodeDecodeAndCheck $ requestWith localNS QueryID qidReqPayload
encodeDecodeAndCheck $ requestWith localNS Join jReqPayload
encodeDecodeAndCheck $ requestWith localNS Leave lReqPayload
encodeDecodeAndCheck $ requestWith localNS Stabilise stabReqPayload
encodeDecodeAndCheck $ requestWith localNS Ping pingReqPayload
encodeDecodeAndCheck $ requestWith localNS QueryLoad qLoadReqPayload
encodeDecodeAndCheck $ responseWith QueryID qidResPayload1
encodeDecodeAndCheck $ responseWith QueryID qidResPayload2
encodeDecodeAndCheck $ responseWith Join jResPayload
encodeDecodeAndCheck $ responseWith Leave lResPayload
encodeDecodeAndCheck $ responseWith Stabilise stabResPayload
encodeDecodeAndCheck $ responseWith Ping pingResPayload
encodeDecodeAndCheck $ requestWith QueryLoad qLoadReqPayload
encodeDecodeAndCheck $ responseWith QueryLoad qLoadResPayload
it "messages are encoded and decoded to ASN.1 DER properly" $
deserialiseMessage (fromJust $ Map.lookup 1 (serialiseMessage 652 $ responseWith Ping pingResPayload)) `shouldBe` Right (responseWith Ping pingResPayload)