server: support server roles and operators

Author: epoberezkin

src/Simplex/FileTransfer/Agent.hs

@@ -461,14 +461,14 @@ runXFTPSndPrepareWorker c Worker {doWork} = do
           pure srv
           where
             tryCreate = do
-              usedSrvs <- newTVarIO ([] :: [XFTPServer])
+              triedHosts <- newTVarIO S.empty
               let AgentClient {xftpServers} = c
               userSrvCount <- liftIO $ length <$> TM.lookupIO userId xftpServers
               withRetryIntervalCount (riFast ri) $ \n _ loop -> do
                 liftIO $ waitWhileSuspended c
                 liftIO $ waitForUserNetwork c
                 let triedAllSrvs = n > userSrvCount
-                createWithNextSrv usedSrvs
+                createWithNextSrv triedHosts
                   `catchAgentError` \e -> retryOnError "XFTP prepare worker" (retryLoop loop triedAllSrvs e) (throwE e) e
               where
                 -- we don't do closeXFTPServerClient here to not risk closing connection for concurrent chunk upload
@@ -477,10 +477,10 @@ runXFTPSndPrepareWorker c Worker {doWork} = do
                     when (triedAllSrvs && serverHostError e) $ notify c sndFileEntityId $ SFWARN e
                   liftIO $ assertAgentForeground c
                   loop
-            createWithNextSrv usedSrvs = do
+            createWithNextSrv triedHosts = do
               deleted <- withStore' c $ \db -> getSndFileDeleted db sndFileId
               when deleted $ throwE $ FILE NO_FILE
-              withNextSrv c userId usedSrvs [] $ \srvAuth -> do
+              withNextSrv c userId storageSrvs triedHosts [] $ \srvAuth -> do
                 replica <- agentXFTPNewChunk c ch numRecipients' srvAuth
                 pure (replica, srvAuth)
 

src/Simplex/Messaging/Agent.hs

@@ -811,8 +811,8 @@ joinConn :: AgentClient -> UserId -> ConnId -> Bool -> Bool -> ConnectionRequest
 joinConn c userId connId hasNewConn enableNtfs cReq cInfo pqSupport subMode = do
   srv <- case cReq of
     CRInvitationUri ConnReqUriData {crSmpQueues = q :| _} _ ->
-      getNextServer c userId [qServer q]
-    _ -> getSMPServer c userId
+      getNextSMPServer c userId [qServer q]
+    _ -> getSMPServer c userId -- TODO when connecting to contact address, also try gettings a different operator/server
   joinConnSrv c userId connId hasNewConn enableNtfs cReq cInfo pqSupport subMode srv
 
 startJoinInvitation :: UserId -> ConnId -> Maybe SndQueue -> Bool -> ConnectionRequestUri 'CMInvitation -> PQSupport -> AM (ConnData, NewSndQueue, C.PublicKeyX25519, CR.Ratchet 'C.X448, CR.SndE2ERatchetParams 'C.X448)
@@ -1169,14 +1169,13 @@ runCommandProcessing c@AgentClient {subQ} connId server_ Worker {doWork} = do
     processCmd ri PendingCommand {cmdId, corrId, userId, command} pendingCmds = case command of
       AClientCommand cmd -> case cmd of
         NEW enableNtfs (ACM cMode) pqEnc subMode -> noServer $ do
-          usedSrvs <- newTVarIO ([] :: [SMPServer])
-          tryCommand . withNextSrv c userId usedSrvs [] $ \srv -> do
+          triedHosts <- newTVarIO S.empty
+          tryCommand . withNextSrv c userId storageSrvs triedHosts [] $ \srv -> do
             (_, cReq) <- newRcvConnSrv c userId connId enableNtfs cMode Nothing pqEnc subMode srv
             notify $ INV (ACR cMode cReq)
         JOIN enableNtfs (ACR _ cReq@(CRInvitationUri ConnReqUriData {crSmpQueues = q :| _} _)) pqEnc subMode connInfo -> noServer $ do
-          let initUsed = [qServer q]
-          usedSrvs <- newTVarIO initUsed
-          tryCommand . withNextSrv c userId usedSrvs initUsed $ \srv -> do
+          triedHosts <- newTVarIO S.empty
+          tryCommand . withNextSrv c userId storageSrvs triedHosts [qServer q] $ \srv -> do
             sqSecured <- joinConnSrvAsync c userId connId enableNtfs cReq connInfo pqEnc subMode srv
             notify $ JOINED sqSecured
         LET confId ownCInfo -> withServer' . tryCommand $ allowConnection' c connId confId ownCInfo >> notify OK
@@ -1624,8 +1623,8 @@ switchDuplexConnection c (DuplexConnection cData@ConnData {connId, userId} rqs s
   checkRQSwchStatus rq RSSwitchStarted
   clientVRange <- asks $ smpClientVRange . config
   -- try to get the server that is different from all queues, or at least from the primary rcv queue
-  srvAuth@(ProtoServerWithAuth srv _) <- getNextServer c userId $ map qServer (L.toList rqs) <> map qServer (L.toList sqs)
-  srv' <- if srv == server then getNextServer c userId [server] else pure srvAuth
+  srvAuth@(ProtoServerWithAuth srv _) <- getNextSMPServer c userId $ map qServer (L.toList rqs) <> map qServer (L.toList sqs)
+  srv' <- if srv == server then getNextSMPServer c userId [server] else pure srvAuth
   (q, qUri, tSess, sessId) <- newRcvQueue c userId connId srv' clientVRange SMSubscribe False
   let rq' = (q :: NewRcvQueue) {primary = True, dbReplaceQueueId = Just dbQueueId}
   rq'' <- withStore c $ \db -> addConnRcvQueue db connId rq'
@@ -2144,9 +2143,13 @@ debugAgentLocks AgentClient {connLocks = cs, invLocks = is, deleteLock = d} = do
     getLocks ls = atomically $ M.mapKeys (B.unpack . strEncode) . M.mapMaybe id <$> (mapM tryReadTMVar =<< readTVar ls)
 
 getSMPServer :: AgentClient -> UserId -> AM SMPServerWithAuth
-getSMPServer c userId = withUserServers c userId pickServer
+getSMPServer c userId = getNextSMPServer c userId []
 {-# INLINE getSMPServer #-}
 
+getNextSMPServer :: AgentClient -> UserId -> [SMPServer] -> AM SMPServerWithAuth
+getNextSMPServer c userId = getNextServer c userId storageSrvs
+{-# INLINE getNextSMPServer #-}
+
 subscriber :: AgentClient -> AM' ()
 subscriber c@AgentClient {msgQ} = forever $ do
   t <- atomically $ readTBQueue msgQ

src/Simplex/Messaging/Agent/Client.hs

@@ -147,7 +147,6 @@ module Simplex.Messaging.Agent.Client
     userServers,
     pickServer,
     getNextServer,
-    withUserServers,
     withNextSrv,
     incSMPServerStat,
     incSMPServerStat',
@@ -191,12 +190,12 @@ import qualified Data.ByteString.Char8 as B
 import Data.Either (isRight, partitionEithers)
 import Data.Functor (($>))
 import Data.Int (Int64)
-import Data.List (deleteFirstsBy, find, foldl', partition, (\\))
+import Data.List (find, foldl', partition)
 import Data.List.NonEmpty (NonEmpty (..), (<|))
 import qualified Data.List.NonEmpty as L
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
-import Data.Maybe (catMaybes, fromMaybe, isJust, isNothing, listToMaybe)
+import Data.Maybe (catMaybes, fromMaybe, isJust, isNothing, listToMaybe, mapMaybe)
 import Data.Set (Set)
 import qualified Data.Set as S
 import Data.Text (Text)
@@ -262,7 +261,6 @@ import Simplex.Messaging.Protocol
     VersionSMPC,
     XFTPServer,
     XFTPServerWithAuth,
-    sameSrvAddr',
     pattern NoEntity,
   )
 import qualified Simplex.Messaging.Protocol as SMP
@@ -617,7 +615,7 @@ getSMPServerClient c@AgentClient {active, smpClients, workerSeq} tSess = do
 getSMPProxyClient :: AgentClient -> Maybe SMPServerWithAuth -> SMPTransportSession -> AM (SMPConnectedClient, Either AgentErrorType ProxiedRelay)
 getSMPProxyClient c@AgentClient {active, smpClients, smpProxiedRelays, workerSeq} proxySrv_ destSess@(userId, destSrv, qId) = do
   unlessM (readTVarIO active) $ throwE INACTIVE
-  proxySrv <- maybe (getNextServer c userId [destSrv]) pure proxySrv_
+  proxySrv <- maybe (getNextServer c userId proxySrvs [destSrv]) pure proxySrv_
   ts <- liftIO getCurrentTime
   atomically (getClientVar proxySrv ts) >>= \(tSess, auth, v) ->
     either (newProxyClient tSess auth ts) (waitForProxyClient tSess auth) v
@@ -1072,7 +1070,7 @@ sendOrProxySMPCommand ::
   (SMPClient -> ProxiedRelay -> ExceptT SMPClientError IO (Either ProxyClientError ())) ->
   (SMPClient -> ExceptT SMPClientError IO ()) ->
   AM (Maybe SMPServer)
-sendOrProxySMPCommand c userId destSrv connId cmdStr senderId sendCmdViaProxy sendCmdDirectly = do
+sendOrProxySMPCommand c userId destSrv@ProtocolServer {host = destHosts} connId cmdStr senderId sendCmdViaProxy sendCmdDirectly = do
   tSess <- mkTransportSession c userId destSrv connId
   ifM shouldUseProxy (sendViaProxy Nothing tSess) (sendDirectly tSess $> Nothing)
   where
@@ -1091,7 +1089,7 @@ sendOrProxySMPCommand c userId destSrv connId cmdStr senderId sendCmdViaProxy se
         SPFAllow -> True
         SPFAllowProtected -> ipAddressProtected cfg destSrv
         SPFProhibit -> False
-    unknownServer = liftIO $ maybe True (notElem destSrv . knownSrvs) <$> TM.lookupIO userId (smpServers c)
+    unknownServer = liftIO $ maybe True (\srvs -> all (`S.notMember` knownHosts srvs) destHosts) <$> TM.lookupIO userId (smpServers c)
     sendViaProxy :: Maybe SMPServerWithAuth -> SMPTransportSession -> AM (Maybe SMPServer)
     sendViaProxy proxySrv_ destSess@(_, _, connId_) = do
       r <- tryAgentError . withProxySession c proxySrv_ destSess senderId ("PFWD " <> cmdStr) $ \(SMPConnectedClient smp _, proxySess@ProxiedRelay {prBasicAuth}) -> do
@@ -2033,33 +2031,82 @@ userServers c = case protocolTypeI @p of
   SPXFTP -> xftpServers c
 {-# INLINE userServers #-}
 
-pickServer :: forall p. NonEmpty (ProtoServerWithAuth p) -> AM (ProtoServerWithAuth p)
+pickServer :: NonEmpty (OperatorId, ProtoServerWithAuth p) -> AM (ProtoServerWithAuth p)
 pickServer = \case
-  srv :| [] -> pure srv
+  (_, srv) :| [] -> pure srv
   servers -> do
     gen <- asks randomServer
-    atomically $ (servers L.!!) <$> stateTVar gen (randomR (0, L.length servers - 1))
+    atomically $ snd . (servers L.!!) <$> stateTVar gen (randomR (0, L.length servers - 1))
 
-getNextServer :: forall p. (ProtocolTypeI p, UserProtocol p) => AgentClient -> UserId -> [ProtocolServer p] -> AM (ProtoServerWithAuth p)
-getNextServer c userId usedSrvs = withUserServers c userId $ \srvs ->
-  case L.nonEmpty $ deleteFirstsBy sameSrvAddr' (L.toList srvs) (map noAuthSrv usedSrvs) of
-    Just srvs' -> pickServer srvs'
-    _ -> pickServer srvs
+getNextServer ::
+  (ProtocolTypeI p, UserProtocol p) =>
+  AgentClient ->
+  UserId -> 
+  (UserServers p -> NonEmpty (OperatorId, ProtoServerWithAuth p)) ->
+  [ProtocolServer p] ->
+  AM (ProtoServerWithAuth p)
+getNextServer c userId srvsSel usedSrvs = do
+  srvs <- getUserServers_ c userId srvsSel
+  snd <$> getNextServer_ srvs (usedOperatorsHosts srvs usedSrvs)
+
+usedOperatorsHosts :: NonEmpty (OperatorId, ProtoServerWithAuth p) -> [ProtocolServer p] -> (Set OperatorId, Set TransportHost)
+usedOperatorsHosts srvs usedSrvs = (usedOperators, usedHosts)
+  where
+    usedHosts = S.unions $ map serverHosts usedSrvs
+    usedOperators = S.fromList $ mapMaybe usedOp $ L.toList srvs
+    usedOp (op, srv) = if hasUsedHost srv then Just op else Nothing
+    hasUsedHost (ProtoServerWithAuth srv _) = any (`S.member` usedHosts) $ serverHosts srv
+
+getNextServer_ ::
+  (ProtocolTypeI p, UserProtocol p) =>
+  NonEmpty (OperatorId, ProtoServerWithAuth p) ->
+  (Set OperatorId, Set TransportHost) ->
+  AM (NonEmpty (OperatorId, ProtoServerWithAuth p), ProtoServerWithAuth p)
+getNextServer_ servers (usedOperators, usedHosts) = do
+  -- choose from servers of unused operators, when possible
+  let otherOpsSrvs = filterOrAll ((`S.notMember` usedOperators) . fst) servers
+      -- choose from servers with unused hosts when possible
+      unusedSrvs = filterOrAll (isUnusedServer usedHosts) otherOpsSrvs
+  (otherOpsSrvs,) <$> pickServer unusedSrvs
+  where
+    filterOrAll p srvs = fromMaybe srvs $ L.nonEmpty $ L.filter p srvs
+
+isUnusedServer :: Set TransportHost -> (OperatorId, ProtoServerWithAuth p) -> Bool
+isUnusedServer usedHosts (_, ProtoServerWithAuth ProtocolServer {host} _) = all (`S.notMember` usedHosts) host
 
-withUserServers :: forall p a. (ProtocolTypeI p, UserProtocol p) => AgentClient -> UserId -> (NonEmpty (ProtoServerWithAuth p) -> AM a) -> AM a
-withUserServers c userId action =
+getUserServers_ ::
+  (ProtocolTypeI p, UserProtocol p) =>
+  AgentClient ->
+  UserId ->
+  (UserServers p -> NonEmpty (OperatorId, ProtoServerWithAuth p)) ->
+  AM (NonEmpty (OperatorId, ProtoServerWithAuth p))
+getUserServers_ c userId srvsSel =
   liftIO (TM.lookupIO userId $ userServers c) >>= \case
-    Just srvs -> action $ enabledSrvs srvs
+    Just srvs -> pure $ srvsSel srvs
     _ -> throwE $ INTERNAL "unknown userId - no user servers"
 
-withNextSrv :: forall p a. (ProtocolTypeI p, UserProtocol p) => AgentClient -> UserId -> TVar [ProtocolServer p] -> [ProtocolServer p] -> (ProtoServerWithAuth p -> AM a) -> AM a
-withNextSrv c userId usedSrvs initUsed action = do
-  used <- readTVarIO usedSrvs
-  srvAuth@(ProtoServerWithAuth srv _) <- getNextServer c userId used
-  srvs_ <- liftIO $ TM.lookupIO userId $ userServers c
-  let unused = maybe [] ((\\ used) . map protoServer . L.toList . enabledSrvs) srvs_
-      used' = if null unused then initUsed else srv : used
-  atomically $ writeTVar usedSrvs $! used'
+-- This function checks used servers and operators every time to allow
+-- changing configuration while retry look is executing.
+-- This function is not thread safe.
+withNextSrv ::
+  (ProtocolTypeI p, UserProtocol p) =>
+  AgentClient ->
+  UserId ->
+  (UserServers p -> NonEmpty (OperatorId, ProtoServerWithAuth p)) ->
+  TVar (Set TransportHost) ->
+  [ProtocolServer p] -> 
+  (ProtoServerWithAuth p -> AM a) ->
+  AM a
+withNextSrv c userId srvsSel triedHosts usedSrvs action = do
+  srvs <- getUserServers_ c userId srvsSel
+  let (usedOperators, usedHosts) = usedOperatorsHosts srvs usedSrvs
+  tried <- readTVarIO triedHosts
+  let triedOrUsed = S.union tried usedHosts
+  (otherOpsSrvs, srvAuth@(ProtoServerWithAuth srv _)) <- getNextServer_ srvs (usedOperators, triedOrUsed)
+  let newHosts = serverHosts srv
+      unusedSrvs = L.filter (isUnusedServer $ S.union triedOrUsed newHosts) otherOpsSrvs
+      !tried' = if null unusedSrvs then S.empty else S.union tried newHosts
+  atomically $ writeTVar triedHosts tried'
   action srvAuth
 
 incSMPServerStat :: AgentClient -> UserId -> SMPServer -> (AgentSMPServerStats -> TVar Int) -> STM ()

src/Simplex/Messaging/Agent/Env/SQLite.hs

@@ -17,11 +17,14 @@ module Simplex.Messaging.Agent.Env.SQLite
     AgentConfig (..),
     InitialAgentServers (..),
     ServerCfg (..),
+    ServerRoles (..),
+    OperatorId,
     UserServers (..),
     NetworkConfig (..),
     presetServerCfg,
     enabledServerCfg,
     mkUserServers,
+    serverHosts,
     defaultAgentConfig,
     defaultReconnectInterval,
     tryAgentError,
@@ -54,6 +57,8 @@ import Data.List.NonEmpty (NonEmpty)
 import qualified Data.List.NonEmpty as L
 import Data.Map.Strict (Map)
 import Data.Maybe (fromMaybe)
+import Data.Set (Set)
+import qualified Data.Set as S
 import Data.Time.Clock (NominalDiffTime, nominalDay)
 import Data.Time.Clock.System (SystemTime (..))
 import Data.Word (Word16)
@@ -71,10 +76,11 @@ import Simplex.Messaging.Notifications.Client (defaultNTFClientConfig)
 import Simplex.Messaging.Notifications.Transport (NTFVersion)
 import Simplex.Messaging.Notifications.Types
 import Simplex.Messaging.Parsers (defaultJSON)
-import Simplex.Messaging.Protocol (NtfServer, ProtoServerWithAuth, ProtocolServer, ProtocolType (..), ProtocolTypeI, VersionRangeSMPC, XFTPServer, supportedSMPClientVRange)
+import Simplex.Messaging.Protocol (NtfServer, ProtoServerWithAuth (..), ProtocolServer (..), ProtocolType (..), ProtocolTypeI, VersionRangeSMPC, XFTPServer, supportedSMPClientVRange)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport (SMPVersion)
+import Simplex.Messaging.Transport.Client (TransportHost)
 import Simplex.Messaging.Util (allFinally, catchAllErrors, catchAllErrors', tryAllErrors, tryAllErrors')
 import System.Mem.Weak (Weak)
 import System.Random (StdGen, newStdGen)
@@ -94,29 +100,45 @@ data InitialAgentServers = InitialAgentServers
 
 data ServerCfg p = ServerCfg
   { server :: ProtoServerWithAuth p,
+    operator :: OperatorId,
     preset :: Bool,
     tested :: Maybe Bool,
-    enabled :: Bool
+    enabled :: Bool,
+    roles :: ServerRoles
   }
   deriving (Show)
 
-enabledServerCfg :: ProtoServerWithAuth p -> ServerCfg p
-enabledServerCfg server = ServerCfg {server, preset = False, tested = Nothing, enabled = True}
+data ServerRoles = ServerRoles
+  { storage :: Bool,
+    proxy :: Bool
+  }
+  deriving (Show)
+
+enabledServerCfg :: OperatorId -> ProtoServerWithAuth p -> ServerCfg p
+enabledServerCfg operator server =
+  ServerCfg {server, operator, preset = False, tested = Nothing, enabled = True, roles = ServerRoles True True}
 
-presetServerCfg :: Bool -> ProtoServerWithAuth p -> ServerCfg p
-presetServerCfg enabled server = ServerCfg {server, preset = True, tested = Nothing, enabled}
+presetServerCfg :: Bool -> ServerRoles -> OperatorId -> ProtoServerWithAuth p -> ServerCfg p
+presetServerCfg enabled roles operator server =
+  ServerCfg {server, operator, preset = True, tested = Nothing, enabled, roles}
 
 data UserServers p = UserServers
-  { enabledSrvs :: NonEmpty (ProtoServerWithAuth p),
-    knownSrvs :: NonEmpty (ProtocolServer p)
+  { storageSrvs :: NonEmpty (OperatorId, ProtoServerWithAuth p),
+    proxySrvs :: NonEmpty (OperatorId, ProtoServerWithAuth p),
+    knownHosts :: Set TransportHost
   }
 
+type OperatorId = Int64
+
 -- This function sets all servers as enabled in case all passed servers are disabled.
 mkUserServers :: NonEmpty (ServerCfg p) -> UserServers p
-mkUserServers srvs = UserServers {enabledSrvs, knownSrvs}
+mkUserServers srvs = UserServers {storageSrvs = filterSrvs storage, proxySrvs = filterSrvs proxy, knownHosts}
   where
-    enabledSrvs = L.map (\ServerCfg {server} -> server) $ fromMaybe srvs $ L.nonEmpty $ L.filter (\ServerCfg {enabled} -> enabled) srvs
-    knownSrvs = L.map (\ServerCfg {server = ProtoServerWithAuth srv _} -> srv) srvs
+    filterSrvs role = L.map (\ServerCfg {operator, server} -> (operator, server)) $ fromMaybe srvs $ L.nonEmpty $ L.filter (\ServerCfg {enabled, roles} -> enabled && role roles) srvs
+    knownHosts = S.unions $ L.map (\ServerCfg {server = ProtoServerWithAuth srv _} -> serverHosts srv) srvs
+
+serverHosts :: ProtocolServer p -> Set TransportHost
+serverHosts ProtocolServer {host} = S.fromList $ L.toList host
 
 data AgentConfig = AgentConfig
   { tcpPort :: Maybe ServiceName,
@@ -333,6 +355,8 @@ updateRestartCount t (RestartCount minute count) = do
 
 $(pure [])
 
+$(JQ.deriveJSON defaultJSON ''ServerRoles)
+
 instance ProtocolTypeI p => ToJSON (ServerCfg p) where
   toEncoding = $(JQ.mkToEncoding defaultJSON ''ServerCfg)
   toJSON = $(JQ.mkToJSON defaultJSON ''ServerCfg)

tests/SMPAgentClient.hs

@@ -92,7 +92,7 @@ userServers :: NonEmpty (ProtocolServer p) -> Map UserId (NonEmpty (ServerCfg p)
 userServers = userServers' . L.map noAuthSrv
 
 userServers' :: NonEmpty (ProtoServerWithAuth p) -> Map UserId (NonEmpty (ServerCfg p))
-userServers' srvs = M.fromList [(1, L.map (presetServerCfg True) srvs)]
+userServers' srvs = M.fromList [(1, L.map (presetServerCfg True (ServerRoles True True) 1) srvs)]
 
 noAuthSrvCfg :: ProtocolServer p -> ServerCfg p
-noAuthSrvCfg = presetServerCfg True . noAuthSrv
+noAuthSrvCfg = presetServerCfg True (ServerRoles True True) 1 . noAuthSrv