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Client.hs
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Client.hs
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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE NumericUnderscores #-}
{-# LANGUAGE OverloadedLists #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE TypeApplications #-}
-- |
-- Module : Simplex.Messaging.Client
-- Copyright : (c) simplex.chat
-- License : AGPL-3
--
-- Maintainer : [email protected]
-- Stability : experimental
-- Portability : non-portable
--
-- This module provides a functional client API for SMP protocol.
--
-- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md
module Simplex.Messaging.Client
( -- * Connect (disconnect) client to (from) SMP server
TransportSession,
ProtocolClient (thParams, sessionTs),
SMPClient,
ProxiedRelay (..),
getProtocolClient,
closeProtocolClient,
protocolClientServer,
protocolClientServer',
transportHost',
transportSession',
-- * SMP protocol command functions
createSMPQueue,
subscribeSMPQueue,
subscribeSMPQueues,
streamSubscribeSMPQueues,
getSMPMessage,
subscribeSMPQueueNotifications,
subscribeSMPQueuesNtfs,
secureSMPQueue,
secureSndSMPQueue,
proxySecureSndSMPQueue,
enableSMPQueueNotifications,
disableSMPQueueNotifications,
enableSMPQueuesNtfs,
disableSMPQueuesNtfs,
sendSMPMessage,
ackSMPMessage,
suspendSMPQueue,
deleteSMPQueue,
deleteSMPQueues,
connectSMPProxiedRelay,
proxySMPMessage,
forwardSMPTransmission,
getSMPQueueInfo,
sendProtocolCommand,
-- * Supporting types and client configuration
ProtocolClientError (..),
SMPClientError,
ProxyClientError (..),
unexpectedResponse,
ProtocolClientConfig (..),
NetworkConfig (..),
TransportSessionMode (..),
HostMode (..),
SocksMode (..),
SMPProxyMode (..),
SMPProxyFallback (..),
defaultClientConfig,
defaultSMPClientConfig,
defaultNetworkConfig,
transportClientConfig,
clientSocksCredentials,
chooseTransportHost,
proxyUsername,
temporaryClientError,
smpProxyError,
textToHostMode,
ServerTransmissionBatch,
ServerTransmission (..),
ClientCommand,
-- * For testing
PCTransmission,
mkTransmission,
authTransmission,
smpClientStub,
-- * For debugging
TBQueueInfo (..),
getTBQueueInfo,
getProtocolClientQueuesInfo,
)
where
import Control.Applicative ((<|>))
import Control.Concurrent (ThreadId, forkFinally, killThread, mkWeakThreadId)
import Control.Concurrent.Async
import Control.Concurrent.STM
import Control.Exception
import Control.Logger.Simple
import Control.Monad
import Control.Monad.Except
import Control.Monad.IO.Class (liftIO)
import Control.Monad.Trans.Except
import Crypto.Random (ChaChaDRG)
import qualified Data.Aeson.TH as J
import qualified Data.Attoparsec.ByteString.Char8 as A
import Data.ByteString.Char8 (ByteString)
import qualified Data.ByteString.Char8 as B
import Data.Functor (($>))
import Data.Int (Int64)
import Data.List (find)
import Data.List.NonEmpty (NonEmpty (..))
import qualified Data.List.NonEmpty as L
import Data.Maybe (catMaybes, fromMaybe)
import Data.Text (Text)
import qualified Data.Text as T
import Data.Time.Clock (UTCTime (..), diffUTCTime, getCurrentTime)
import qualified Data.X509 as X
import qualified Data.X509.Validation as XV
import Network.Socket (ServiceName)
import Network.Socks5 (SocksCredentials (..))
import Numeric.Natural
import qualified Simplex.Messaging.Crypto as C
import Simplex.Messaging.Encoding
import Simplex.Messaging.Encoding.String
import Simplex.Messaging.Parsers (defaultJSON, dropPrefix, enumJSON, sumTypeJSON)
import Simplex.Messaging.Protocol
import Simplex.Messaging.Server.QueueStore.QueueInfo
import Simplex.Messaging.TMap (TMap)
import qualified Simplex.Messaging.TMap as TM
import Simplex.Messaging.Transport
import Simplex.Messaging.Transport.Client (SocksAuth (..), SocksProxyWithAuth (..), TransportClientConfig (..), TransportHost (..), defaultTcpConnectTimeout, runTransportClient)
import Simplex.Messaging.Transport.KeepAlive
import Simplex.Messaging.Transport.WebSockets (WS)
import Simplex.Messaging.Util (bshow, diffToMicroseconds, ifM, liftEitherWith, raceAny_, threadDelay', tshow, whenM)
import Simplex.Messaging.Version
import System.Mem.Weak (Weak, deRefWeak)
import System.Timeout (timeout)
-- | 'SMPClient' is a handle used to send commands to a specific SMP server.
--
-- Use 'getSMPClient' to connect to an SMP server and create a client handle.
data ProtocolClient v err msg = ProtocolClient
{ action :: Maybe (Weak ThreadId),
thParams :: THandleParams v 'TClient,
sessionTs :: UTCTime,
client_ :: PClient v err msg
}
data PClient v err msg = PClient
{ connected :: TVar Bool,
transportSession :: TransportSession msg,
transportHost :: TransportHost,
tcpConnectTimeout :: Int,
tcpTimeout :: Int,
sendPings :: TVar Bool,
lastReceived :: TVar UTCTime,
timeoutErrorCount :: TVar Int,
clientCorrId :: TVar ChaChaDRG,
sentCommands :: TMap CorrId (Request err msg),
sndQ :: TBQueue (Maybe (TVar Bool), ByteString),
rcvQ :: TBQueue (NonEmpty (SignedTransmission err msg)),
msgQ :: Maybe (TBQueue (ServerTransmissionBatch v err msg))
}
smpClientStub :: TVar ChaChaDRG -> ByteString -> VersionSMP -> Maybe (THandleAuth 'TClient) -> IO SMPClient
smpClientStub g sessionId thVersion thAuth = do
let ts = UTCTime (read "2024-03-31") 0
connected <- newTVarIO False
clientCorrId <- atomically $ C.newRandomDRG g
sentCommands <- TM.emptyIO
sendPings <- newTVarIO False
lastReceived <- newTVarIO ts
timeoutErrorCount <- newTVarIO 0
sndQ <- newTBQueueIO 100
rcvQ <- newTBQueueIO 100
return
ProtocolClient
{ action = Nothing,
thParams =
THandleParams
{ sessionId,
thVersion,
thServerVRange = supportedServerSMPRelayVRange,
thAuth,
blockSize = smpBlockSize,
implySessId = thVersion >= authCmdsSMPVersion,
batch = True
},
sessionTs = ts,
client_ =
PClient
{ connected,
transportSession = (1, "smp://LcJUMfVhwD8yxjAiSaDzzGF3-kLG4Uh0Fl_ZIjrRwjI=@localhost:5001", Nothing),
transportHost = "localhost",
tcpConnectTimeout = 20_000_000,
tcpTimeout = 15_000_000,
sendPings,
lastReceived,
timeoutErrorCount,
clientCorrId,
sentCommands,
sndQ,
rcvQ,
msgQ = Nothing
}
}
type SMPClient = ProtocolClient SMPVersion ErrorType BrokerMsg
-- | Type for client command data
type ClientCommand msg = (Maybe C.APrivateAuthKey, EntityId, ProtoCommand msg)
-- | Type synonym for transmission from SPM servers.
-- Batch response is presented as a single `ServerTransmissionBatch` tuple.
type ServerTransmissionBatch v err msg = (TransportSession msg, Version v, SessionId, NonEmpty (EntityId, ServerTransmission err msg))
data ServerTransmission err msg
= STEvent (Either (ProtocolClientError err) msg)
| STResponse (ProtoCommand msg) (Either (ProtocolClientError err) msg)
| STUnexpectedError (ProtocolClientError err)
data HostMode
= -- | prefer (or require) onion hosts when connecting via SOCKS proxy
HMOnionViaSocks
| -- | prefer (or require) onion hosts
HMOnion
| -- | prefer (or require) public hosts
HMPublic
deriving (Eq, Show)
textToHostMode :: Text -> Either String HostMode
textToHostMode = \case
"public" -> Right HMPublic
"onion" -> Right HMOnionViaSocks
s -> Left $ T.unpack $ "Invalid host_mode: " <> s
data SocksMode
= -- | always use SOCKS proxy when enabled
SMAlways
| -- | use SOCKS proxy only for .onion hosts when no public host is available
-- This mode is used in SMP proxy and in notifications server to minimize SOCKS proxy usage.
SMOnion
deriving (Eq, Show)
instance StrEncoding SocksMode where
strEncode = \case
SMAlways -> "always"
SMOnion -> "onion"
strP =
A.takeTill (== ' ') >>= \case
"always" -> pure SMAlways
"onion" -> pure SMOnion
_ -> fail "Invalid Socks mode"
-- | network configuration for the client
data NetworkConfig = NetworkConfig
{ -- | use SOCKS5 proxy
socksProxy :: Maybe SocksProxyWithAuth,
-- | when to use SOCKS proxy
socksMode :: SocksMode,
-- | determines critera which host is chosen from the list
hostMode :: HostMode,
-- | if above criteria is not met, if the below setting is True return error, otherwise use the first host
requiredHostMode :: Bool,
-- | transport sessions are created per user or per entity
sessionMode :: TransportSessionMode,
-- | SMP proxy mode
smpProxyMode :: SMPProxyMode,
-- | Fallback to direct connection when destination SMP relay does not support SMP proxy protocol extensions
smpProxyFallback :: SMPProxyFallback,
-- | timeout for the initial client TCP/TLS connection (microseconds)
tcpConnectTimeout :: Int,
-- | timeout of protocol commands (microseconds)
tcpTimeout :: Int,
-- | additional timeout per kilobyte (1024 bytes) to be sent
tcpTimeoutPerKb :: Int64,
-- | break response timeouts into groups, so later responses get later deadlines
rcvConcurrency :: Int,
-- | TCP keep-alive options, Nothing to skip enabling keep-alive
tcpKeepAlive :: Maybe KeepAliveOpts,
-- | period for SMP ping commands (microseconds, 0 to disable)
smpPingInterval :: Int64,
-- | the count of timeout errors after which SMP client terminates (and will be reconnected), 0 to disable
smpPingCount :: Int,
logTLSErrors :: Bool
}
deriving (Eq, Show)
data TransportSessionMode = TSMUser | TSMEntity
deriving (Eq, Show)
-- SMP proxy mode for sending messages
data SMPProxyMode
= SPMAlways
| SPMUnknown -- use with unknown relays
| SPMUnprotected -- use with unknown relays when IP address is not protected (i.e., when neither SOCKS proxy nor .onion address is used)
| SPMNever
deriving (Eq, Show)
data SMPProxyFallback
= SPFAllow -- connect directly when chosen proxy or destination relay do not support proxy protocol.
| SPFAllowProtected -- connect directly only when IP address is protected (SOCKS proxy or .onion address is used).
| SPFProhibit -- prohibit direct connection to destination relay.
deriving (Eq, Show)
instance StrEncoding SMPProxyMode where
strEncode = \case
SPMAlways -> "always"
SPMUnknown -> "unknown"
SPMUnprotected -> "unprotected"
SPMNever -> "never"
strP =
A.takeTill (== ' ') >>= \case
"always" -> pure SPMAlways
"unknown" -> pure SPMUnknown
"unprotected" -> pure SPMUnprotected
"never" -> pure SPMNever
_ -> fail "Invalid SMP proxy mode"
instance StrEncoding SMPProxyFallback where
strEncode = \case
SPFAllow -> "yes"
SPFAllowProtected -> "protected"
SPFProhibit -> "no"
strP =
A.takeTill (== ' ') >>= \case
"yes" -> pure SPFAllow
"protected" -> pure SPFAllowProtected
"no" -> pure SPFProhibit
_ -> fail "Invalid SMP proxy fallback mode"
defaultNetworkConfig :: NetworkConfig
defaultNetworkConfig =
NetworkConfig
{ socksProxy = Nothing,
socksMode = SMAlways,
hostMode = HMOnionViaSocks,
requiredHostMode = False,
sessionMode = TSMUser,
smpProxyMode = SPMNever,
smpProxyFallback = SPFAllow,
tcpConnectTimeout = defaultTcpConnectTimeout,
tcpTimeout = 15_000_000,
tcpTimeoutPerKb = 5_000,
rcvConcurrency = 8,
tcpKeepAlive = Just defaultKeepAliveOpts,
smpPingInterval = 600_000_000, -- 10min
smpPingCount = 3,
logTLSErrors = False
}
transportClientConfig :: NetworkConfig -> TransportHost -> TransportClientConfig
transportClientConfig NetworkConfig {socksProxy, socksMode, tcpConnectTimeout, tcpKeepAlive, logTLSErrors} host =
TransportClientConfig {socksProxy = useSocksProxy socksMode, tcpConnectTimeout, tcpKeepAlive, logTLSErrors, clientCredentials = Nothing, alpn = Nothing}
where
socksProxy' = (\(SocksProxyWithAuth _ proxy) -> proxy) <$> socksProxy
useSocksProxy SMAlways = socksProxy'
useSocksProxy SMOnion = case host of
THOnionHost _ -> socksProxy'
_ -> Nothing
{-# INLINE transportClientConfig #-}
clientSocksCredentials :: NetworkConfig -> ByteString -> Maybe SocksCredentials
clientSocksCredentials NetworkConfig {socksProxy} sessionUsername = case socksProxy of
Just (SocksProxyWithAuth auth _) -> case auth of
SocksAuthUsername {username, password} -> Just $ SocksCredentials username password
SocksAuthNull -> Nothing
SocksIsolateByAuth -> Just $ SocksCredentials sessionUsername ""
Nothing -> Nothing
{-# INLINE clientSocksCredentials #-}
-- | protocol client configuration.
data ProtocolClientConfig v = ProtocolClientConfig
{ -- | size of TBQueue to use for server commands and responses
qSize :: Natural,
-- | default server port if port is not specified in ProtocolServer
defaultTransport :: (ServiceName, ATransport),
-- | network configuration
networkConfig :: NetworkConfig,
clientALPN :: Maybe [ALPN],
-- | client-server protocol version range
serverVRange :: VersionRange v,
-- | agree shared session secret (used in SMP proxy for additional encryption layer)
agreeSecret :: Bool
}
-- | Default protocol client configuration.
defaultClientConfig :: Maybe [ALPN] -> VersionRange v -> ProtocolClientConfig v
defaultClientConfig clientALPN serverVRange =
ProtocolClientConfig
{ qSize = 64,
defaultTransport = ("443", transport @TLS),
networkConfig = defaultNetworkConfig,
clientALPN,
serverVRange,
agreeSecret = False
}
{-# INLINE defaultClientConfig #-}
defaultSMPClientConfig :: ProtocolClientConfig SMPVersion
defaultSMPClientConfig = defaultClientConfig (Just supportedSMPHandshakes) supportedClientSMPRelayVRange
{-# INLINE defaultSMPClientConfig #-}
data Request err msg = Request
{ corrId :: CorrId,
entityId :: EntityId,
command :: ProtoCommand msg,
pending :: TVar Bool,
responseVar :: TMVar (Either (ProtocolClientError err) msg)
}
data Response err msg = Response
{ entityId :: EntityId,
response :: Either (ProtocolClientError err) msg
}
chooseTransportHost :: NetworkConfig -> NonEmpty TransportHost -> Either (ProtocolClientError err) TransportHost
chooseTransportHost NetworkConfig {socksProxy, hostMode, requiredHostMode} hosts =
firstOrError $ case hostMode of
HMOnionViaSocks -> maybe publicHost (const onionHost) socksProxy
HMOnion -> onionHost
HMPublic -> publicHost
where
firstOrError
| requiredHostMode = maybe (Left PCEIncompatibleHost) Right
| otherwise = Right . fromMaybe (L.head hosts)
isOnionHost = \case THOnionHost _ -> True; _ -> False
onionHost = find isOnionHost hosts
publicHost = find (not . isOnionHost) hosts
protocolClientServer :: ProtocolTypeI (ProtoType msg) => ProtocolClient v err msg -> String
protocolClientServer = B.unpack . strEncode . protocolClientServer'
{-# INLINE protocolClientServer #-}
protocolClientServer' :: ProtocolClient v err msg -> ProtoServer msg
protocolClientServer' = snd3 . transportSession . client_
where
snd3 (_, s, _) = s
{-# INLINE protocolClientServer' #-}
transportHost' :: ProtocolClient v err msg -> TransportHost
transportHost' = transportHost . client_
{-# INLINE transportHost' #-}
transportSession' :: ProtocolClient v err msg -> TransportSession msg
transportSession' = transportSession . client_
{-# INLINE transportSession' #-}
type UserId = Int64
-- | Transport session key - includes entity ID if `sessionMode = TSMEntity`.
-- Please note that for SMP connection ID is used as entity ID, not queue ID.
type TransportSession msg = (UserId, ProtoServer msg, Maybe ByteString)
-- | Connects to 'ProtocolServer' using passed client configuration
-- and queue for messages and notifications.
--
-- A single queue can be used for multiple 'SMPClient' instances,
-- as 'SMPServerTransmission' includes server information.
getProtocolClient :: forall v err msg. Protocol v err msg => TVar ChaChaDRG -> TransportSession msg -> ProtocolClientConfig v -> Maybe (TBQueue (ServerTransmissionBatch v err msg)) -> (ProtocolClient v err msg -> IO ()) -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize, networkConfig, clientALPN, serverVRange, agreeSecret} msgQ disconnected = do
case chooseTransportHost networkConfig (host srv) of
Right useHost ->
(getCurrentTime >>= mkProtocolClient useHost >>= runClient useTransport useHost)
`catch` \(e :: IOException) -> pure . Left $ PCEIOError e
Left e -> pure $ Left e
where
NetworkConfig {tcpConnectTimeout, tcpTimeout, smpPingInterval} = networkConfig
mkProtocolClient :: TransportHost -> UTCTime -> IO (PClient v err msg)
mkProtocolClient transportHost ts = do
connected <- newTVarIO False
sendPings <- newTVarIO False
lastReceived <- newTVarIO ts
timeoutErrorCount <- newTVarIO 0
clientCorrId <- atomically $ C.newRandomDRG g
sentCommands <- TM.emptyIO
sndQ <- newTBQueueIO qSize
rcvQ <- newTBQueueIO qSize
return
PClient
{ connected,
transportSession,
transportHost,
tcpConnectTimeout,
tcpTimeout,
sendPings,
lastReceived,
timeoutErrorCount,
clientCorrId,
sentCommands,
sndQ,
rcvQ,
msgQ
}
runClient :: (ServiceName, ATransport) -> TransportHost -> PClient v err msg -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
runClient (port', ATransport t) useHost c = do
cVar <- newEmptyTMVarIO
let tcConfig = (transportClientConfig networkConfig useHost) {alpn = clientALPN}
socksCreds = clientSocksCredentials networkConfig $ proxyUsername transportSession
tId <-
runTransportClient tcConfig socksCreds useHost port' (Just $ keyHash srv) (client t c cVar)
`forkFinally` \_ -> void (atomically . tryPutTMVar cVar $ Left PCENetworkError)
c_ <- tcpConnectTimeout `timeout` atomically (takeTMVar cVar)
case c_ of
Just (Right c') -> mkWeakThreadId tId >>= \tId' -> pure $ Right c' {action = Just tId'}
Just (Left e) -> pure $ Left e
Nothing -> killThread tId $> Left PCENetworkError
useTransport :: (ServiceName, ATransport)
useTransport = case port srv of
"" -> defaultTransport cfg
"80" -> ("80", transport @WS)
p -> (p, transport @TLS)
client :: forall c. Transport c => TProxy c -> PClient v err msg -> TMVar (Either (ProtocolClientError err) (ProtocolClient v err msg)) -> c -> IO ()
client _ c cVar h = do
ks <- if agreeSecret then Just <$> atomically (C.generateKeyPair g) else pure Nothing
runExceptT (protocolClientHandshake @v @err @msg h ks (keyHash srv) serverVRange) >>= \case
Left e -> atomically . putTMVar cVar . Left $ PCETransportError e
Right th@THandle {params} -> do
sessionTs <- getCurrentTime
let c' = ProtocolClient {action = Nothing, client_ = c, thParams = params, sessionTs}
atomically $ writeTVar (lastReceived c) sessionTs
atomically $ do
writeTVar (connected c) True
putTMVar cVar $ Right c'
raceAny_ ([send c' th, process c', receive c' th] <> [monitor c' | smpPingInterval > 0])
`finally` disconnected c'
send :: Transport c => ProtocolClient v err msg -> THandle v c 'TClient -> IO ()
send ProtocolClient {client_ = PClient {sndQ}} h = forever $ atomically (readTBQueue sndQ) >>= sendPending
where
sendPending (Nothing, s) = send_ s
sendPending (Just pending, s) = whenM (readTVarIO pending) $ send_ s
send_ = void . tPutLog h
receive :: Transport c => ProtocolClient v err msg -> THandle v c 'TClient -> IO ()
receive ProtocolClient {client_ = PClient {rcvQ, lastReceived, timeoutErrorCount}} h = forever $ do
tGet h >>= atomically . writeTBQueue rcvQ
getCurrentTime >>= atomically . writeTVar lastReceived
atomically $ writeTVar timeoutErrorCount 0
monitor :: ProtocolClient v err msg -> IO ()
monitor c@ProtocolClient {client_ = PClient {sendPings, lastReceived, timeoutErrorCount}} = loop smpPingInterval
where
loop :: Int64 -> IO ()
loop delay = do
threadDelay' delay
diff <- diffUTCTime <$> getCurrentTime <*> readTVarIO lastReceived
let idle = diffToMicroseconds diff
remaining = smpPingInterval - idle
if remaining > 1_000_000 -- delay pings only for significant time
then loop remaining
else do
whenM (readTVarIO sendPings) $ void . runExceptT $ sendProtocolCommand c Nothing NoEntity (protocolPing @v @err @msg)
-- sendProtocolCommand/getResponse updates counter for each command
cnt <- readTVarIO timeoutErrorCount
-- drop client when maxCnt of commands have timed out in sequence, but only after some time has passed after last received response
when (maxCnt == 0 || cnt < maxCnt || diff < recoverWindow) $ loop smpPingInterval
recoverWindow = 15 * 60 -- seconds
maxCnt = smpPingCount networkConfig
process :: ProtocolClient v err msg -> IO ()
process c = forever $ atomically (readTBQueue $ rcvQ $ client_ c) >>= processMsgs c
processMsgs :: ProtocolClient v err msg -> NonEmpty (SignedTransmission err msg) -> IO ()
processMsgs c ts = do
ts' <- catMaybes <$> mapM (processMsg c) (L.toList ts)
forM_ msgQ $ \q ->
mapM_ (atomically . writeTBQueue q . serverTransmission c) (L.nonEmpty ts')
processMsg :: ProtocolClient v err msg -> SignedTransmission err msg -> IO (Maybe (EntityId, ServerTransmission err msg))
processMsg ProtocolClient {client_ = PClient {sentCommands}} (_, _, (corrId, entId, respOrErr))
| B.null $ bs corrId = sendMsg $ STEvent clientResp
| otherwise =
TM.lookupIO corrId sentCommands >>= \case
Nothing -> sendMsg $ STUnexpectedError unexpected
Just Request {entityId, command, pending, responseVar} -> do
wasPending <-
atomically $ do
TM.delete corrId sentCommands
ifM
(swapTVar pending False)
(True <$ tryPutTMVar responseVar (if entityId == entId then clientResp else Left unexpected))
(pure False)
if wasPending
then pure Nothing
else sendMsg $ if entityId == entId then STResponse command clientResp else STUnexpectedError unexpected
where
unexpected = unexpectedResponse respOrErr
clientResp = case respOrErr of
Left e -> Left $ PCEResponseError e
Right r -> case protocolError r of
Just e -> Left $ PCEProtocolError e
_ -> Right r
sendMsg :: ServerTransmission err msg -> IO (Maybe (EntityId, ServerTransmission err msg))
sendMsg t = case msgQ of
Just _ -> pure $ Just (entId, t)
Nothing ->
Nothing <$ case clientResp of
Left e -> logError $ "SMP client error: " <> tshow e
Right _ -> logWarn "SMP client unprocessed event"
unexpectedResponse :: Show r => r -> ProtocolClientError err
unexpectedResponse = PCEUnexpectedResponse . B.pack . take 32 . show
proxyUsername :: TransportSession msg -> ByteString
proxyUsername (userId, _, entityId_) = C.sha256Hash $ bshow userId <> maybe "" (":" <>) entityId_
{-# INLINE proxyUsername #-}
-- | Disconnects client from the server and terminates client threads.
closeProtocolClient :: ProtocolClient v err msg -> IO ()
closeProtocolClient = mapM_ (deRefWeak >=> mapM_ killThread) . action
{-# INLINE closeProtocolClient #-}
-- | SMP client error type.
data ProtocolClientError err
= -- | Correctly parsed SMP server ERR response.
-- This error is forwarded to the agent client as `ERR SMP err`.
PCEProtocolError err
| -- | Invalid server response that failed to parse.
-- Forwarded to the agent client as `ERR BROKER RESPONSE`.
PCEResponseError err
| -- | Different response from what is expected to a certain SMP command,
-- e.g. server should respond `IDS` or `ERR` to `NEW` command,
-- other responses would result in this error.
-- Forwarded to the agent client as `ERR BROKER UNEXPECTED`.
PCEUnexpectedResponse ByteString
| -- | Used for TCP connection and command response timeouts.
-- Forwarded to the agent client as `ERR BROKER TIMEOUT`.
PCEResponseTimeout
| -- | Failure to establish TCP connection.
-- Forwarded to the agent client as `ERR BROKER NETWORK`.
PCENetworkError
| -- | No host compatible with network configuration
PCEIncompatibleHost
| -- | TCP transport handshake or some other transport error.
-- Forwarded to the agent client as `ERR BROKER TRANSPORT e`.
PCETransportError TransportError
| -- | Error when cryptographically "signing" the command or when initializing crypto_box.
PCECryptoError C.CryptoError
| -- | IO Error
PCEIOError IOException
deriving (Eq, Show, Exception)
type SMPClientError = ProtocolClientError ErrorType
temporaryClientError :: ProtocolClientError err -> Bool
temporaryClientError = \case
PCENetworkError -> True
PCEResponseTimeout -> True
PCEIOError _ -> True
_ -> False
{-# INLINE temporaryClientError #-}
-- converts error of client running on proxy to the error sent to client connected to proxy
smpProxyError :: SMPClientError -> ErrorType
smpProxyError = \case
PCEProtocolError e -> PROXY $ PROTOCOL e
PCEResponseError e -> PROXY $ BROKER $ RESPONSE $ B.unpack $ strEncode e
PCEUnexpectedResponse e -> PROXY $ BROKER $ UNEXPECTED $ B.unpack e
PCEResponseTimeout -> PROXY $ BROKER TIMEOUT
PCENetworkError -> PROXY $ BROKER NETWORK
PCEIncompatibleHost -> PROXY $ BROKER HOST
PCETransportError t -> PROXY $ BROKER $ TRANSPORT t
PCECryptoError _ -> CRYPTO
PCEIOError _ -> INTERNAL
-- | Create a new SMP queue.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#create-queue-command
createSMPQueue ::
SMPClient ->
C.AAuthKeyPair -> -- SMP v6 - signature key pair, SMP v7 - DH key pair
RcvPublicDhKey ->
Maybe BasicAuth ->
SubscriptionMode ->
Bool ->
ExceptT SMPClientError IO QueueIdsKeys
createSMPQueue c (rKey, rpKey) dhKey auth subMode sndSecure =
sendSMPCommand c (Just rpKey) NoEntity (NEW rKey dhKey auth subMode sndSecure) >>= \case
IDS qik -> pure qik
r -> throwE $ unexpectedResponse r
-- | Subscribe to the SMP queue.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#subscribe-to-queue
subscribeSMPQueue :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> ExceptT SMPClientError IO ()
subscribeSMPQueue c@ProtocolClient {client_ = PClient {sendPings}} rpKey rId = do
liftIO . atomically $ writeTVar sendPings True
sendSMPCommand c (Just rpKey) rId SUB >>= \case
OK -> pure ()
cmd@MSG {} -> liftIO $ writeSMPMessage c rId cmd
r -> throwE $ unexpectedResponse r
-- | Subscribe to multiple SMP queues batching commands if supported.
subscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
subscribeSMPQueues c@ProtocolClient {client_ = PClient {sendPings}} qs = do
atomically $ writeTVar sendPings True
sendProtocolCommands c cs >>= mapM (processSUBResponse c)
where
cs = L.map (\(rpKey, rId) -> (Just rpKey, rId, Cmd SRecipient SUB)) qs
streamSubscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> ([(RecipientId, Either SMPClientError ())] -> IO ()) -> IO ()
streamSubscribeSMPQueues c qs cb = streamProtocolCommands c cs $ mapM process >=> cb
where
cs = L.map (\(rpKey, rId) -> (Just rpKey, rId, Cmd SRecipient SUB)) qs
process r@(Response rId _) = (rId,) <$> processSUBResponse c r
processSUBResponse :: SMPClient -> Response ErrorType BrokerMsg -> IO (Either SMPClientError ())
processSUBResponse c (Response rId r) = case r of
Right OK -> pure $ Right ()
Right cmd@MSG {} -> writeSMPMessage c rId cmd $> Right ()
Right r' -> pure . Left $ unexpectedResponse r'
Left e -> pure $ Left e
writeSMPMessage :: SMPClient -> RecipientId -> BrokerMsg -> IO ()
writeSMPMessage c rId msg = atomically $ mapM_ (`writeTBQueue` serverTransmission c [(rId, STEvent (Right msg))]) (msgQ $ client_ c)
serverTransmission :: ProtocolClient v err msg -> NonEmpty (RecipientId, ServerTransmission err msg) -> ServerTransmissionBatch v err msg
serverTransmission ProtocolClient {thParams = THandleParams {thVersion, sessionId}, client_ = PClient {transportSession}} ts =
(transportSession, thVersion, sessionId, ts)
-- | Get message from SMP queue. The server returns ERR PROHIBITED if a client uses SUB and GET via the same transport connection for the same queue
--
-- https://github.covm/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#receive-a-message-from-the-queue
getSMPMessage :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> ExceptT SMPClientError IO (Maybe RcvMessage)
getSMPMessage c rpKey rId =
sendSMPCommand c (Just rpKey) rId GET >>= \case
OK -> pure Nothing
cmd@(MSG msg) -> liftIO (writeSMPMessage c rId cmd) $> Just msg
r -> throwE $ unexpectedResponse r
-- | Subscribe to the SMP queue notifications.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#subscribe-to-queue-notifications
subscribeSMPQueueNotifications :: SMPClient -> NtfPrivateAuthKey -> NotifierId -> ExceptT SMPClientError IO ()
subscribeSMPQueueNotifications = okSMPCommand NSUB
{-# INLINE subscribeSMPQueueNotifications #-}
-- | Subscribe to multiple SMP queues notifications batching commands if supported.
subscribeSMPQueuesNtfs :: SMPClient -> NonEmpty (NtfPrivateAuthKey, NotifierId) -> IO (NonEmpty (Either SMPClientError ()))
subscribeSMPQueuesNtfs = okSMPCommands NSUB
{-# INLINE subscribeSMPQueuesNtfs #-}
-- | Secure the SMP queue by adding a sender public key.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#secure-queue-command
secureSMPQueue :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> SndPublicAuthKey -> ExceptT SMPClientError IO ()
secureSMPQueue c rpKey rId senderKey = okSMPCommand (KEY senderKey) c rpKey rId
{-# INLINE secureSMPQueue #-}
-- | Secure the SMP queue via sender queue ID.
secureSndSMPQueue :: SMPClient -> SndPrivateAuthKey -> SenderId -> SndPublicAuthKey -> ExceptT SMPClientError IO ()
secureSndSMPQueue c spKey sId senderKey = okSMPCommand (SKEY senderKey) c spKey sId
{-# INLINE secureSndSMPQueue #-}
proxySecureSndSMPQueue :: SMPClient -> ProxiedRelay -> SndPrivateAuthKey -> SenderId -> SndPublicAuthKey -> ExceptT SMPClientError IO (Either ProxyClientError ())
proxySecureSndSMPQueue c proxiedRelay spKey sId senderKey = proxySMPCommand c proxiedRelay (Just spKey) sId (SKEY senderKey)
{-# INLINE proxySecureSndSMPQueue #-}
-- | Enable notifications for the queue for push notifications server.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#enable-notifications-command
enableSMPQueueNotifications :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> NtfPublicAuthKey -> RcvNtfPublicDhKey -> ExceptT SMPClientError IO (NotifierId, RcvNtfPublicDhKey)
enableSMPQueueNotifications c rpKey rId notifierKey rcvNtfPublicDhKey =
sendSMPCommand c (Just rpKey) rId (NKEY notifierKey rcvNtfPublicDhKey) >>= \case
NID nId rcvNtfSrvPublicDhKey -> pure (nId, rcvNtfSrvPublicDhKey)
r -> throwE $ unexpectedResponse r
-- | Enable notifications for the multiple queues for push notifications server.
enableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId, NtfPublicAuthKey, RcvNtfPublicDhKey) -> IO (NonEmpty (Either SMPClientError (NotifierId, RcvNtfPublicDhKey)))
enableSMPQueuesNtfs c qs = L.map process <$> sendProtocolCommands c cs
where
cs = L.map (\(rpKey, rId, notifierKey, rcvNtfPublicDhKey) -> (Just rpKey, rId, Cmd SRecipient $ NKEY notifierKey rcvNtfPublicDhKey)) qs
process (Response _ r) = case r of
Right (NID nId rcvNtfSrvPublicDhKey) -> Right (nId, rcvNtfSrvPublicDhKey)
Right r' -> Left $ unexpectedResponse r'
Left e -> Left e
-- | Disable notifications for the queue for push notifications server.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#disable-notifications-command
disableSMPQueueNotifications :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> ExceptT SMPClientError IO ()
disableSMPQueueNotifications = okSMPCommand NDEL
{-# INLINE disableSMPQueueNotifications #-}
-- | Disable notifications for multiple queues for push notifications server.
disableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
disableSMPQueuesNtfs = okSMPCommands NDEL
{-# INLINE disableSMPQueuesNtfs #-}
-- | Send SMP message.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#send-message
sendSMPMessage :: SMPClient -> Maybe SndPrivateAuthKey -> SenderId -> MsgFlags -> MsgBody -> ExceptT SMPClientError IO ()
sendSMPMessage c spKey sId flags msg =
sendSMPCommand c spKey sId (SEND flags msg) >>= \case
OK -> pure ()
r -> throwE $ unexpectedResponse r
proxySMPMessage :: SMPClient -> ProxiedRelay -> Maybe SndPrivateAuthKey -> SenderId -> MsgFlags -> MsgBody -> ExceptT SMPClientError IO (Either ProxyClientError ())
proxySMPMessage c proxiedRelay spKey sId flags msg = proxySMPCommand c proxiedRelay spKey sId (SEND flags msg)
-- | Acknowledge message delivery (server deletes the message).
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#acknowledge-message-delivery
ackSMPMessage :: SMPClient -> RcvPrivateAuthKey -> QueueId -> MsgId -> ExceptT SMPClientError IO ()
ackSMPMessage c rpKey rId msgId =
sendSMPCommand c (Just rpKey) rId (ACK msgId) >>= \case
OK -> return ()
cmd@MSG {} -> liftIO $ writeSMPMessage c rId cmd
r -> throwE $ unexpectedResponse r
-- | Irreversibly suspend SMP queue.
-- The existing messages from the queue will still be delivered.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#suspend-queue
suspendSMPQueue :: SMPClient -> RcvPrivateAuthKey -> QueueId -> ExceptT SMPClientError IO ()
suspendSMPQueue = okSMPCommand OFF
{-# INLINE suspendSMPQueue #-}
-- | Irreversibly delete SMP queue and all messages in it.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#delete-queue
deleteSMPQueue :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> ExceptT SMPClientError IO ()
deleteSMPQueue = okSMPCommand DEL
{-# INLINE deleteSMPQueue #-}
-- | Delete multiple SMP queues batching commands if supported.
deleteSMPQueues :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
deleteSMPQueues = okSMPCommands DEL
{-# INLINE deleteSMPQueues #-}
-- send PRXY :: SMPServer -> Maybe BasicAuth -> Command Sender
-- receives PKEY :: SessionId -> X.CertificateChain -> X.SignedExact X.PubKey -> BrokerMsg
connectSMPProxiedRelay :: SMPClient -> SMPServer -> Maybe BasicAuth -> ExceptT SMPClientError IO ProxiedRelay
connectSMPProxiedRelay c@ProtocolClient {client_ = PClient {tcpConnectTimeout, tcpTimeout}} relayServ@ProtocolServer {keyHash = C.KeyHash kh} proxyAuth
| thVersion (thParams c) >= sendingProxySMPVersion =
sendProtocolCommand_ c Nothing tOut Nothing NoEntity (Cmd SProxiedClient (PRXY relayServ proxyAuth)) >>= \case
PKEY sId vr (chain, key) ->
case supportedClientSMPRelayVRange `compatibleVersion` vr of
Nothing -> throwE $ transportErr TEVersion
Just (Compatible v) -> liftEitherWith (const $ transportErr $ TEHandshake IDENTITY) $ ProxiedRelay sId v proxyAuth <$> validateRelay chain key
r -> throwE $ unexpectedResponse r
| otherwise = throwE $ PCETransportError TEVersion
where
tOut = Just $ tcpConnectTimeout + tcpTimeout
transportErr = PCEProtocolError . PROXY . BROKER . TRANSPORT
validateRelay :: X.CertificateChain -> X.SignedExact X.PubKey -> Either String C.PublicKeyX25519
validateRelay (X.CertificateChain cert) exact = do
serverKey <- case cert of
[leaf, ca]
| XV.Fingerprint kh == XV.getFingerprint ca X.HashSHA256 ->
C.x509ToPublic (X.certPubKey . X.signedObject $ X.getSigned leaf, []) >>= C.pubKey
_ -> throwError "bad certificate"
pubKey <- C.verifyX509 serverKey exact
C.x509ToPublic (pubKey, []) >>= C.pubKey
data ProxiedRelay = ProxiedRelay
{ prSessionId :: SessionId,
prVersion :: VersionSMP,
prBasicAuth :: Maybe BasicAuth, -- auth is included here to allow reconnecting via the same proxy after NO_SESSION error
prServerKey :: C.PublicKeyX25519
}
data ProxyClientError
= -- | protocol error response from proxy
ProxyProtocolError {protocolErr :: ErrorType}
| -- | unexpexted response
ProxyUnexpectedResponse {responseStr :: String}
| -- | error between proxy and server
ProxyResponseError {responseErr :: ErrorType}
deriving (Eq, Show, Exception)
instance StrEncoding ProxyClientError where
strEncode = \case
ProxyProtocolError e -> "PROTOCOL " <> strEncode e
ProxyUnexpectedResponse s -> "UNEXPECTED " <> B.pack s
ProxyResponseError e -> "SYNTAX " <> strEncode e
strP =
A.takeTill (== ' ') >>= \case
"PROTOCOL" -> ProxyProtocolError <$> _strP
"UNEXPECTED" -> ProxyUnexpectedResponse . B.unpack <$> (A.space *> A.takeByteString)
"SYNTAX" -> ProxyResponseError <$> _strP
_ -> fail "bad ProxyClientError"
-- consider how to process slow responses - is it handled somehow locally or delegated to the caller
-- this method is used in the client
-- sends PFWD :: C.PublicKeyX25519 -> EncTransmission -> Command Sender
-- receives PRES :: EncResponse -> BrokerMsg -- proxy to client
-- When client sends message via proxy, there may be one successful scenario and 9 error scenarios
-- as shown below (WTF stands for unexpected response, ??? for response that failed to parse).
-- client proxy relay proxy client
-- 0) PFWD(SEND) -> RFWD -> RRES -> PRES(OK) -> ok
-- 1) PFWD(SEND) -> RFWD -> RRES -> PRES(ERR) -> PCEProtocolError - business logic error for client
-- 2) PFWD(SEND) -> RFWD -> RRES -> PRES(WTF) -> PCEUnexpectedReponse - relay/client protocol logic error
-- 3) PFWD(SEND) -> RFWD -> RRES -> PRES(???) -> PCEResponseError - relay/client syntax error
-- 4) PFWD(SEND) -> RFWD -> ERR -> ERR PROXY PROTOCOL -> ProxyProtocolError - proxy/relay business logic error
-- 5) PFWD(SEND) -> RFWD -> WTF -> ERR PROXY $ BROKER (UNEXPECTED s) -> ProxyProtocolError - proxy/relay protocol logic
-- 6) PFWD(SEND) -> RFWD -> ??? -> ERR PROXY $ BROKER (RESPONSE s) -> ProxyProtocolError - - proxy/relay syntax
-- 7) PFWD(SEND) -> ERR -> ProxyProtocolError - client/proxy business logic
-- 8) PFWD(SEND) -> WTF -> ProxyUnexpectedResponse - client/proxy protocol logic
-- 9) PFWD(SEND) -> ??? -> ProxyResponseError - client/proxy syntax
--
-- We report as proxySMPCommand error (ExceptT error) the errors of two kinds:
-- - protocol errors from the destination relay wrapped in PRES - to simplify processing of AUTH and QUOTA errors, in this case proxy is "transparent" for such errors (PCEProtocolError, PCEUnexpectedResponse, PCEResponseError)
-- - other response/transport/connection errors from the client connected to proxy itself
-- Other errors are reported in the function result as `Either ProxiedRelayError ()`, including
-- - protocol errors from the client connected to proxy in ProxyClientError (PCEProtocolError, PCEUnexpectedResponse, PCEResponseError)
-- - other errors from the client running on proxy and connected to relay in PREProxiedRelayError
-- This function proxies Sender commands that return OK or ERR
proxySMPCommand ::
SMPClient ->
-- proxy session from PKEY
ProxiedRelay ->
-- message to deliver
Maybe SndPrivateAuthKey ->
SenderId ->
Command 'Sender ->
ExceptT SMPClientError IO (Either ProxyClientError ())
proxySMPCommand c@ProtocolClient {thParams = proxyThParams, client_ = PClient {clientCorrId = g, tcpTimeout}} (ProxiedRelay sessionId v _ serverKey) spKey sId command = do
-- prepare params
let serverThAuth = (\ta -> ta {serverPeerPubKey = serverKey}) <$> thAuth proxyThParams
serverThParams = smpTHParamsSetVersion v proxyThParams {sessionId, thAuth = serverThAuth}
(cmdPubKey, cmdPrivKey) <- liftIO . atomically $ C.generateKeyPair @'C.X25519 g
let cmdSecret = C.dh' serverKey cmdPrivKey
nonce@(C.CbNonce corrId) <- liftIO . atomically $ C.randomCbNonce g
-- encode
let TransmissionForAuth {tForAuth, tToSend} = encodeTransmissionForAuth serverThParams (CorrId corrId, sId, Cmd SSender command)
auth <- liftEitherWith PCETransportError $ authTransmission serverThAuth spKey nonce tForAuth
b <- case batchTransmissions (batch serverThParams) (blockSize serverThParams) [Right (auth, tToSend)] of
[] -> throwE $ PCETransportError TELargeMsg
TBError e _ : _ -> throwE $ PCETransportError e
TBTransmission s _ : _ -> pure s
TBTransmissions s _ _ : _ -> pure s
et <- liftEitherWith PCECryptoError $ EncTransmission <$> C.cbEncrypt cmdSecret nonce b paddedProxiedTLength
-- proxy interaction errors are wrapped
let tOut = Just $ 2 * tcpTimeout
tryE (sendProtocolCommand_ c (Just nonce) tOut Nothing (EntityId sessionId) (Cmd SProxiedClient (PFWD v cmdPubKey et))) >>= \case
Right r -> case r of
PRES (EncResponse er) -> do
-- server interaction errors are thrown directly
t' <- liftEitherWith PCECryptoError $ C.cbDecrypt cmdSecret (C.reverseNonce nonce) er
case tParse serverThParams t' of
t'' :| [] -> case tDecodeParseValidate serverThParams t'' of
(_auth, _signed, (_c, _e, cmd)) -> case cmd of
Right OK -> pure $ Right ()
Right (ERR e) -> throwE $ PCEProtocolError e -- this is the error from the destination relay
Right r' -> throwE $ unexpectedResponse r'
Left e -> throwE $ PCEResponseError e
_ -> throwE $ PCETransportError TEBadBlock
ERR e -> pure . Left $ ProxyProtocolError e -- this will not happen, this error is returned via Left
_ -> pure . Left $ ProxyUnexpectedResponse $ take 32 $ show r
Left e -> case e of
PCEProtocolError e' -> pure . Left $ ProxyProtocolError e'
PCEUnexpectedResponse e' -> pure . Left $ ProxyUnexpectedResponse $ B.unpack e'
PCEResponseError e' -> pure . Left $ ProxyResponseError e'
_ -> throwE e
-- this method is used in the proxy
-- sends RFWD :: EncFwdTransmission -> Command Sender
-- receives RRES :: EncFwdResponse -> BrokerMsg
-- proxy should send PRES to the client with EncResponse
forwardSMPTransmission :: SMPClient -> CorrId -> VersionSMP -> C.PublicKeyX25519 -> EncTransmission -> ExceptT SMPClientError IO EncResponse
forwardSMPTransmission c@ProtocolClient {thParams, client_ = PClient {clientCorrId = g}} fwdCorrId fwdVersion fwdKey fwdTransmission = do
-- prepare params
sessSecret <- case thAuth thParams of
Nothing -> throwE $ PCETransportError TENoServerAuth
Just THAuthClient {sessSecret} -> maybe (throwE $ PCETransportError TENoServerAuth) pure sessSecret
nonce <- liftIO . atomically $ C.randomCbNonce g
-- wrap
let fwdT = FwdTransmission {fwdCorrId, fwdVersion, fwdKey, fwdTransmission}
eft = EncFwdTransmission $ C.cbEncryptNoPad sessSecret nonce (smpEncode fwdT)
-- send
sendProtocolCommand_ c (Just nonce) Nothing Nothing NoEntity (Cmd SSender (RFWD eft)) >>= \case
RRES (EncFwdResponse efr) -> do
-- unwrap
r' <- liftEitherWith PCECryptoError $ C.cbDecryptNoPad sessSecret (C.reverseNonce nonce) efr
FwdResponse {fwdCorrId = _, fwdResponse} <- liftEitherWith (const $ PCEResponseError BLOCK) $ smpDecode r'
pure fwdResponse
r -> throwE $ unexpectedResponse r
getSMPQueueInfo :: SMPClient -> C.APrivateAuthKey -> QueueId -> ExceptT SMPClientError IO QueueInfo