mqtt-hs (empty) → 0.2.0
raw patch · 9 files changed
+2061/−0 lines, 9 filesdep +attoparsecdep +basedep +bytestringsetup-changed
Dependencies added: attoparsec, base, bytestring, monad-loops, mtl, network, singletons, text
Files
- LICENSE +675/−0
- Network/MQTT.hs +534/−0
- Network/MQTT/Encoding.hs +190/−0
- Network/MQTT/Logger.hs +39/−0
- Network/MQTT/Parser.hs +242/−0
- Network/MQTT/Types.hs +322/−0
- README.md +17/−0
- Setup.hs +2/−0
- mqtt-hs.cabal +40/−0
+ LICENSE view
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Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++ You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<http://www.gnu.org/licenses/>.++ The GNU General Public License does not permit incorporating your program+into proprietary programs. If your program is a subroutine library, you+may consider it more useful to permit linking proprietary applications with+the library. If this is what you want to do, use the GNU Lesser General+Public License instead of this License. But first, please read+<http://www.gnu.org/philosophy/why-not-lgpl.html>.+
+ Network/MQTT.hs view
@@ -0,0 +1,534 @@+{-# Language OverloadedStrings,+ DataKinds,+ ScopedTypeVariables,+ GADTs,+ DeriveDataTypeable #-}+{-|+Module: MQTT+Copyright: Lukas Braun 2014+License: GPL-3+Maintainer: koomi+mqtt@hackerspace-bamberg.de++A MQTT client library.++A simple example, assuming a broker is running on localhost+(needs -XOverloadedStrings):++>>> import Network.MQTT+>>> import Network.MQTT.Logger+>>> Just mqtt <- connect defaultConfig { cLogger = warnings stdLogger }+>>> let f t payload = putStrLn $ "A message was published to " ++ show t ++ ": " ++ show payload+>>> subscribe mqtt NoConfirm "#" f+NoConfirm+>>> publish mqtt Handshake False "some random/topic" "Some content!"+A message was published to "some random/topic": "Some content!"+-}+module Network.MQTT+ ( -- * Creating connections+ connect+ , MQTT+ , disconnect+ , reconnect+ , onReconnect+ , resubscribe+ -- * Connection settings+ , MQTTConfig+ , defaultConfig+ -- ** Field accessors+ , cHost+ , cPort+ , cClean+ , cWill+ , cUsername+ , cPassword+ , cKeepAlive+ , cClientID+ , cConnectTimeout+ , cReconnPeriod+ , cLogger+ -- * Subscribing and publishing+ , subscribe+ , unsubscribe+ , publish+ -- * Sending and receiving 'Message's+ , send+ , addHandler+ , removeHandler+ , awaitMsg+ , awaitMsg'+ -- * Reexports+ , module Network.MQTT.Types+ ) where++import Control.Applicative (pure, (<$>), (<*>), (<$))+import Control.Concurrent+import Control.Exception hiding (handle)+import Control.Monad hiding (sequence_)+import Data.Attoparsec.ByteString (parseOnly)+import Data.Bits ((.&.))+import Data.ByteString (hGet, ByteString)+import qualified Data.ByteString as BS+import Data.Foldable (for_, sequence_, traverse_)+import Data.Maybe (isJust, fromJust)+import Data.Singletons (withSomeSing, SingI(..))+import Data.Singletons.Decide+import Data.Text (Text)+import Data.Traversable (for)+import Data.Typeable (Typeable)+import Data.Unique+import Data.Word+import Network+import Prelude hiding (sequence_)+import System.IO (Handle, hClose, hIsEOF, hSetBinaryMode)+import System.Timeout (timeout)++import Network.MQTT.Types+import Network.MQTT.Parser (mqttBody, mqttHeader)+import Network.MQTT.Encoding+import qualified Network.MQTT.Logger as L++-----------------------------------------+-- Interface+-----------------------------------------++-- | Abstract type representing a connection to a broker.+data MQTT+ = MQTT+ { config :: MQTTConfig+ , handle :: MVar Handle+ , handlers :: MVar [MessageHandler]+ , topicHandlers :: MVar [TopicHandler]+ , recvThread :: MVar ThreadId+ , reconnectHandler :: MVar (IO ())+ , keepAliveThread :: MVar ThreadId+ , sendSem :: Maybe QSem+ }++data TopicHandler+ = TopicHandler+ { thTopic :: Topic+ , thQoS :: QoS+ , thHandler :: Topic -> ByteString -> IO ()+ }++data MessageHandler where+ MessageHandler :: SingI t+ => Unique+ -> (Message t -> IO ())+ -> MessageHandler++-- | The various options when establishing a connection.+data MQTTConfig+ = MQTTConfig+ { cHost :: HostName+ -- ^ Hostname of the broker.+ , cPort :: PortNumber+ -- ^ Port of the broker.+ , cClean :: Bool+ -- ^ Should the server forget subscriptions and other state on+ -- disconnects?+ , cWill :: Maybe Will+ -- ^ Optional 'Will' message.+ , cUsername :: Maybe Text+ -- ^ Optional username used for authentication.+ , cPassword :: Maybe Text+ -- ^ Optional password used for authentication.+ , cKeepAlive :: Maybe Int+ -- ^ Maximum interval (in seconds) in which a message must be sent.+ -- 0 means no limit.+ , cClientID :: Text+ -- ^ Client ID used by the server to identify clients.+ , cConnectTimeout :: Maybe Int+ -- ^ Time in seconds after which waiting for a CONNACK is aborted.+ -- 'Nothing' means no timeout.+ , cReconnPeriod :: Maybe Int+ -- ^ Time in seconds to wait between reconnect attempts.+ -- 'Nothing' means no reconnects are attempted.+ , cLogger :: L.Logger+ -- ^ Functions for logging, see 'Network.MQTT.Logger.Logger'.+ }++-- | Defaults for 'MQTTConfig', connects to a server running on+-- localhost.+defaultConfig :: MQTTConfig+defaultConfig = MQTTConfig+ { cHost = "localhost"+ , cPort = 1883+ , cClean = True+ , cWill = Nothing+ , cUsername = Nothing+ , cPassword = Nothing+ , cKeepAlive = Nothing+ , cClientID = "mqtt-haskell"+ , cConnectTimeout = Nothing+ , cReconnPeriod = Nothing+ , cLogger = L.stdLogger+ }+++-- | Establish a connection. This might fail with an 'IOException' or+-- return 'Nothing' if the server did not accept the connection.+connect :: MQTTConfig -> IO (Maybe MQTT)+connect conf = do+ h <- connectTo (cHost conf) (PortNumber $ cPort conf)+ hSetBinaryMode h True+ mqtt <- MQTT conf+ <$> newMVar h+ <*> newMVar []+ <*> newMVar []+ <*> newEmptyMVar+ <*> newEmptyMVar+ <*> newEmptyMVar+ <*> for (cKeepAlive conf) (const (newQSem 0))+ mCode <- handshake mqtt+ if mCode == Just 0+ then Just mqtt <$ do forkIO (recvLoop mqtt) >>= putMVar (recvThread mqtt)+ forkIO (keepAliveLoop mqtt) >>=+ putMVar (keepAliveThread mqtt)+ addHandler mqtt (publishHandler mqtt)+ else Nothing <$ hClose h++-- | Send a 'Message' to the server.+send :: MQTT -> Message t -> IO ()+send mqtt msg = do+ logInfo mqtt $ "Sending " ++ show (toMsgType msg)+ h <- readMVar (handle mqtt)+ writeTo h msg+ for_ (sendSem mqtt) signalQSem++handshake :: MQTT -> IO (Maybe Word8)+handshake mqtt = do+ let timeout' = maybe (fmap Just) (timeout . (* 1000000))+ (cConnectTimeout (config mqtt))+ sendConnect mqtt+ msg <- timeout' (getMessage mqtt) `catch` \e ->+ Nothing <$ logError mqtt (show (e :: MQTTException) +++ " while waiting for CONNACK")+ return $ case msg of+ Just (SomeMessage (Message _ (MConnAck (ConnAck code)))) -> Just code+ _ -> Nothing++sendConnect :: MQTT -> IO ()+sendConnect mqtt = send mqtt connect+ where+ conf = config mqtt+ connect = Message+ (Header False NoConfirm False)+ (MConnect $ Connect+ (cClean conf)+ (cWill conf)+ (MqttText $ cClientID conf)+ (MqttText <$> cUsername conf)+ (MqttText <$> cPassword conf)+ (maybe 0 fromIntegral $ cKeepAlive conf))++-- | Block until a 'Message' of the given type, optionally with the given+-- 'MsgID', arrives.+--+-- Note this expects a singleton to guarantee the returned 'Message' is of+-- the 'MsgType' that is being waited for. Singleton constructors are the+-- 'MsgType' constructors prefixed with a capital @S@, e.g. 'SPUBLISH'.+awaitMsg :: SingI t => MQTT -> SMsgType t -> Maybe MsgID -> IO (Message t)+awaitMsg mqtt _ mMsgID = do+ var <- newEmptyMVar+ handlerID <- addHandler mqtt (putMVar var)+ let wait = do+ msg <- readMVar var+ if isJust mMsgID+ then if mMsgID == getMsgID (body msg)+ then removeHandler mqtt handlerID >> return msg+ else wait+ else removeHandler mqtt handlerID >> return msg+ wait++-- | A version of 'awaitMsg' that infers the type of the 'Message' that+-- is expected.+awaitMsg' :: SingI t => MQTT -> Maybe MsgID -> IO (Message t)+awaitMsg' mqtt mMsgID = awaitMsg mqtt sing mMsgID++-- | Register a callback that gets invoked whenever a 'Message' of the+-- expected 'MsgType' is received. Returns the ID of the handler which can be+-- passed to 'removeHandler'.+addHandler :: SingI t => MQTT -> (Message t -> IO ()) -> IO Unique+addHandler mqtt handler = do+ mhID <- newUnique+ modifyMVar_ (handlers mqtt) $ \hs ->+ return $ MessageHandler mhID handler : hs+ return mhID++-- | Remove the handler with the given ID.+removeHandler :: MQTT -> Unique -> IO ()+removeHandler mqtt mhID = modifyMVar_ (handlers mqtt) $ \hs ->+ return $ filter (\(MessageHandler mhID' _) -> mhID' /= mhID) hs++-- | Subscribe to a 'Topic' with the given 'QoS' and invoke the callback+-- whenever something is published to the 'Topic'. Returns the 'QoS' that+-- was granted by the broker (lower or equal to the one requested).+--+-- The 'Topic' may contain+-- <http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#appendix-a wildcars>.+-- The 'Topic' passed to the callback is the fully expanded version where+-- the message was actually published.+subscribe :: MQTT -> QoS -> Topic -> (Topic -> ByteString -> IO ())+ -> IO QoS+subscribe mqtt qos topic handler = do+ qosGranted <- sendSubscribe mqtt qos topic+ modifyMVar_ (topicHandlers mqtt) $ \hs ->+ return $ TopicHandler topic qosGranted handler : hs+ return qosGranted++sendSubscribe :: MQTT -> QoS -> Topic -> IO QoS+sendSubscribe mqtt qos topic = do+ msgID <- fromIntegral . hashUnique <$> newUnique+ send mqtt $ Message+ (Header False Confirm False)+ (MSubscribe $ Subscribe+ msgID+ [(topic, qos)])+ msg <- awaitMsg mqtt SSUBACK (Just msgID)+ case msg of+ (Message _ (MSubAck (SubAck _ [qosGranted]))) -> return qosGranted+ _ -> fail $ "Received invalid message as response to subscribe: "+ ++ show (toMsgType msg)++-- | Unsubscribe from the given 'Topic' and remove any handlers.+unsubscribe :: MQTT -> Topic -> IO ()+unsubscribe mqtt topic = do+ modifyMVar_ (topicHandlers mqtt) $ return . filter ((== topic) . thTopic)+ msgID <- fromIntegral . hashUnique <$> newUnique+ send mqtt $ Message+ (Header False Confirm False)+ (MUnsubscribe $ Unsubscribe msgID [topic])+ void $ awaitMsg mqtt SUNSUBACK (Just msgID)++-- | Publish a message to the given 'Topic' at the requested 'QoS' level.+-- The payload can be any sequence of bytes, including none at all. The 'Bool'+-- parameter decides if the server should retain the message for future+-- subscribers to the topic.+--+-- The 'Topic' must not contain+-- <http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#appendix-a wildcards>.+publish :: MQTT -> QoS -> Bool -> Topic -> ByteString -> IO ()+publish mqtt qos retain topic body = do+ msgID <- if qos > NoConfirm+ then Just . fromIntegral . hashUnique <$> newUnique+ else return Nothing+ send mqtt $ Message+ (Header False qos retain)+ (MPublish $ Publish topic msgID body)+ case qos of+ NoConfirm -> return ()+ Confirm -> void $ awaitMsg mqtt SPUBACK msgID+ Handshake -> do+ void $ awaitMsg mqtt SPUBREC msgID+ send mqtt $ Message+ (Header False Confirm False)+ (MPubRel $ SimpleMsg (fromJust msgID))+ void $ awaitMsg mqtt SPUBCOMP msgID++-- | Close the connection to the server.+disconnect :: MQTT -> IO ()+disconnect mqtt = do+ h <- takeMVar $ handle mqtt+ writeTo h $+ Message+ (Header False NoConfirm False)+ MDisconnect+ readMVar (recvThread mqtt) >>= killThread+ readMVar (keepAliveThread mqtt) >>= killThread+ hClose h++-- | Try creating a new connection with the same config (retrying after the+-- specified amount of seconds has passed) and invoke the callback that is+-- set with 'onReconnect' once a new connection has been established.+--+-- Does not terminate the old connection.+reconnect :: MQTT -> Int -> IO ()+reconnect mqtt period = do+ -- Other threads can't write while the MVar is empty+ _ <- takeMVar (handle mqtt)+ logInfo mqtt "Reconnecting..."+ -- Temporarily create a new MVar for the handshake so other threads+ -- don't write before the connection is fully established+ handleVar <- newEmptyMVar+ go (mqtt { handle = handleVar })+ readMVar handleVar >>= putMVar (handle mqtt)+ -- forkIO so recvLoop isn't blocked+ tryReadMVar (reconnectHandler mqtt) >>= traverse_ (void . forkIO)+ logInfo mqtt "Reconnect successfull"+ where+ -- try reconnecting until it works+ go mqtt' = do+ let conf = config mqtt+ connectTo (cHost conf) (PortNumber $ cPort conf)+ >>= putMVar (handle mqtt')+ mCode <- handshake mqtt'+ unless (mCode == Just 0) $ do+ void $ takeMVar (handle mqtt')+ threadDelay (period * 10^6)+ go mqtt'+ `catch`+ \e -> do+ logWarning mqtt $ "reconnect: " ++ show (e :: IOException)+ threadDelay (period * 10^6)+ go mqtt'++-- | Register a callback that will be invoked when a reconnect has+-- happened.+onReconnect :: MQTT -> IO () -> IO ()+onReconnect mqtt io = do+ let mvar = reconnectHandler mqtt+ empty <- isEmptyMVar mvar+ unless empty (void $ takeMVar mvar)+ putMVar mvar io++-- | Resubscribe to all topics. Returns the new list of granted 'QoS'.+resubscribe :: MQTT -> IO [QoS]+resubscribe mqtt = do+ ths <- readMVar (topicHandlers mqtt)+ mapM (\th -> sendSubscribe mqtt (thQoS th) (thTopic th)) ths++maybeReconnect :: MQTT -> IO ()+maybeReconnect mqtt = do+ catch+ (readMVar (handle mqtt) >>= hClose)+ (const (pure ()) :: IOException -> IO ())+ for_ (cReconnPeriod $ config mqtt) $ reconnect mqtt+++-----------------------------------------+-- Logger utility functions+-----------------------------------------++logInfo :: MQTT -> String -> IO ()+logInfo mqtt = L.logInfo (cLogger (config mqtt))++logWarning :: MQTT -> String -> IO ()+logWarning mqtt = L.logWarning (cLogger (config mqtt))++logError :: MQTT -> String -> IO ()+logError mqtt = L.logError (cLogger (config mqtt))+++-----------------------------------------+-- Internal+-----------------------------------------++recvLoop :: MQTT -> IO ()+recvLoop mqtt = forever $ do+ h <- readMVar (handle mqtt)+ eof <- hIsEOF h+ if eof+ then do+ logError mqtt "EOF in recvLoop"+ maybeReconnect mqtt+ else getMessage mqtt >>= dispatchMessage mqtt+ `catches`+ [ Handler $ \e -> do+ logError mqtt $ "recvLoop: Caught " ++ show (e :: IOException)+ maybeReconnect mqtt+ , Handler $ \e ->+ logWarning mqtt $ "recvLoop: Caught " ++ show (e :: MQTTException)+ ]++dispatchMessage :: MQTT -> SomeMessage -> IO ()+dispatchMessage mqtt (SomeMessage (msg :: Message t)) =+ readMVar (handlers mqtt) >>= mapM_ applyMsg+ where+ typeSing :: SMsgType t+ typeSing = toSMsgType msg++ applyMsg :: MessageHandler -> IO ()+ applyMsg (MessageHandler _ (handler :: Message t' -> IO ())) =+ case typeSing %~ (sing :: SMsgType t') of+ Proved Refl -> void $ forkIO $ handler msg+ Disproved _ -> return ()++-- | Block on a semaphore that is signaled by 'send'. If a timeout occurs+-- while waiting, send a 'PINGREQ' to the server and wait for PINGRESP.+-- Ignores errors that occur while writing to the handle, reconnects are+-- initiated by 'recvLoop'.+--+-- Returns immediately if no Keep Alive is specified.+keepAliveLoop :: MQTT -> IO ()+keepAliveLoop mqtt =+ sequence_ (loop <$> cKeepAlive (config mqtt) <*> sendSem mqtt)+ where+ loop period sem = forever $ do+ rslt <- timeout (period * 1000000) $ waitQSem sem+ case rslt of+ Nothing -> (do send mqtt $ Message+ (Header False NoConfirm False)+ MPingReq+ void $ awaitMsg mqtt SPINGRESP Nothing)+ `catch`+ (\e -> logError mqtt $ "keepAliveLoop: " ++ show (e :: IOException))+ Just _ -> return ()++publishHandler :: MQTT -> Message PUBLISH -> IO ()+publishHandler mqtt (Message header (MPublish body)) = do+ case (qos header, pubMsgID body) of+ (Confirm, Just msgid) ->+ send mqtt $ Message+ (Header False NoConfirm False)+ (MPubAck $ SimpleMsg msgid)+ (Handshake, Just msgid) -> do+ send mqtt $ Message+ (Header False NoConfirm False)+ (MPubRec $ SimpleMsg msgid)+ void $ awaitMsg mqtt SPUBREL (Just msgid)+ send mqtt $ Message+ (Header False NoConfirm False)+ (MPubComp $ SimpleMsg msgid)+ _ -> return ()+ callbacks <- filter (matches (topic body) . thTopic)+ <$> readMVar (topicHandlers mqtt)+ for_ callbacks $ \th -> thHandler th (topic body) (payload body)++getMessage :: MQTT -> IO SomeMessage+getMessage mqtt = do+ h <- readMVar (handle mqtt)+ headerByte <- hGet' h 1+ remaining <- getRemaining h 0+ rest <- hGet' h remaining+ let parseRslt = do+ (mType, header) <- parseOnly mqttHeader headerByte+ withSomeSing mType $ \sMsgType ->+ parseOnly+ (SomeMessage . Message header+ <$> mqttBody header sMsgType (fromIntegral remaining))+ rest+ case parseRslt of+ Left err -> logError mqtt ("Error while parsing: " ++ err) >>+ throw (ParseError err)+ Right msg -> msg <$+ logInfo mqtt ("Received " ++ show (toMsgType' msg))++getRemaining :: Handle -> Int -> IO Int+getRemaining h n = go n 1+ where+ go acc fac = do+ b <- getByte h+ let acc' = acc + (b .&. 127) * fac+ if b .&. 128 == 0+ then return acc'+ else go acc' (fac * 128)++getByte :: Handle -> IO Int+getByte h = fromIntegral . BS.head <$> hGet' h 1++hGet' :: Handle -> Int -> IO BS.ByteString+hGet' h n = do+ bs <- hGet h n+ if BS.length bs < n+ then throw EOF+ else return bs++-- | Exceptions that may arise while parsing messages. A user should+-- never see one of these.+data MQTTException+ = EOF+ | ParseError String+ deriving (Show, Typeable)++instance Exception MQTTException where
+ Network/MQTT/Encoding.hs view
@@ -0,0 +1,190 @@+{-# Language OverloadedStrings, RecordWildCards, GADTs #-}+{-|+Module: MQTT.Encoding+Copyright: Lukas Braun 2014+License: GPL-3+Maintainer: koomi+mqtt@hackerspace-bamberg.de++Binary encoding for MQTT messages.+-}++module Network.MQTT.Encoding where++import Data.Bits (Bits(..))+import qualified Data.ByteString as BS+import qualified Data.ByteString.Lazy as BSL+import Data.ByteString.Builder+import Data.Foldable (foldMap)+import Data.Int (Int64)+import Data.Maybe (isJust)+import Data.Monoid ((<>), mconcat, mempty)+import Data.Word (Word8)+import Data.Text.Encoding (encodeUtf8)+import System.IO (Handle)++import Network.MQTT.Types++-- | Directly write a 'Message' to the buffer of a 'Handle'.+writeTo :: Handle -> Message t -> IO ()+writeTo h msg = hPutBuilder h (putMessage msg)++-- | Generate a 'Builder' for any 'Message'.+putMessage :: Message t -> Builder+putMessage Message{..} = mconcat+ [ putMqttHeader header (msgType body)+ , encodeRemaining remaining+ , lazyByteString bodyBS+ ]+ where+ -- the header contains the length of the remaining message, so we have+ -- to build the body to determine the length in bytes+ bodyBS = toLazyByteString (putBody body)+ remaining = BSL.length bodyBS+++---------------------------------+-- * Fixed Header+---------------------------------++-- | Build a 'MqttHeader' for the given message type.+putMqttHeader :: MqttHeader -> Word8 -> Builder+putMqttHeader (Header dup qos retain) msgType =+ word8 $ shiftL msgType 4 .|.+ shiftL (toBit dup) 3 .|.+ shiftL (fromQoS qos) 1 .|.+ toBit retain++-- | Encode the remaining length field.+encodeRemaining :: Int64 -> Builder+encodeRemaining n =+ let (n', digit) = n `quotRem` 128+ digit' = fromIntegral digit+ in if n' > 0+ -- set top bit to indicate more digits are following+ then word8 (digit' .|. 0x80) <> encodeRemaining n'+ else word8 digit'+++---------------------------------+-- * Body+---------------------------------++-- | Build the 'MessageBody' for any message type.+putBody :: MessageBody t -> Builder+putBody (MConnect connect) = putConnect connect+putBody (MConnAck connAck) = putConnAck connAck+putBody (MPublish publish) = putPublish publish+putBody (MPubAck simpleMsg) = putSimple simpleMsg+putBody (MPubRec simpleMsg) = putSimple simpleMsg+putBody (MPubRel simpleMsg) = putSimple simpleMsg+putBody (MPubComp simpleMsg) = putSimple simpleMsg+putBody (MSubscribe subscribe) = putSubscribe subscribe+putBody (MSubAck subAck) = putSubAck subAck+putBody (MUnsubscribe unsubscribe) = putUnsubscribe unsubscribe+putBody (MUnsubAck simpleMsg) = putSimple simpleMsg+putBody MPingReq = mempty+putBody MPingResp = mempty+putBody MDisconnect = mempty+++putConnect :: Connect -> Builder+putConnect Connect{..} = mconcat+ [ putMqttText "MQIsdp" -- protocol+ , word8 3 -- version+ , word8 flags+ , word16BE keepAlive+ , putMqttText clientID+ , maybe mempty putTopic (fmap wTopic will)+ , maybePut (fmap wMsg will)+ , maybePut username+ , maybePut password+ ]+ where+ maybePut = maybe mempty putMqttText+ flags = shiftL (toBit (isJust username)) 7 .|.+ shiftL (toBit (isJust password)) 6 .|.+ shiftL (maybe 0 (toBit . wRetain) will) 5 .|.+ shiftL (maybe 0 (fromQoS . wQoS) will) 3 .|.+ shiftL (toBit (isJust will)) 2 .|.+ shiftL (toBit cleanSession) 1+++putConnAck :: ConnAck -> Builder+putConnAck = word8 . returnCode+++putPublish :: Publish -> Builder+putPublish Publish{..} = mconcat+ [ putTopic topic+ , maybe mempty putMsgID pubMsgID+ , byteString payload+ ]+++putSubscribe :: Subscribe -> Builder+putSubscribe Subscribe{..} = mconcat+ [ putMsgID subscribeMsgID+ , foldMap (\(txt, qos) -> putTopic txt <> word8 (fromQoS qos)) subTopics+ ]+++putSubAck :: SubAck -> Builder+putSubAck SubAck{..} = mconcat+ [ putMsgID subAckMsgID+ , foldMap (word8 . fromQoS) granted+ ]++putUnsubscribe :: Unsubscribe -> Builder+putUnsubscribe Unsubscribe{..} = mconcat+ [ putMsgID unsubMsgID+ , foldMap putTopic unsubTopics+ ]++putSimple :: SimpleMsg -> Builder+putSimple = putMsgID . msgID+++---------------------------------+-- * Utility functions+---------------------------------++-- | Build a 'MsgID'.+putMsgID :: MsgID -> Builder+putMsgID = word16BE++-- | Build a length-prefixed 'MqttText'.+putMqttText :: MqttText -> Builder+putMqttText (MqttText text) = let utf = encodeUtf8 text in+ word16BE (fromIntegral (BS.length utf)) <> byteString utf++-- | Build a 'Topic'.+putTopic :: Topic -> Builder+putTopic = putMqttText . fromTopic++-- | Encode a 'QoS'.+fromQoS :: (Num a) => QoS -> a+fromQoS NoConfirm = 0+fromQoS Confirm = 1+fromQoS Handshake = 2++-- | Convert a 'Bool' to 0 or 1.+toBit :: (Num a) => Bool -> a+toBit False = 0+toBit True = 1++-- | Encode the type of a 'MessageBody'.+msgType :: (Num a) => MessageBody t -> a+msgType (MConnect _) = 1+msgType (MConnAck _) = 2+msgType (MPublish _) = 3+msgType (MPubAck _) = 4+msgType (MPubRec _) = 5+msgType (MPubRel _) = 6+msgType (MPubComp _) = 7+msgType (MSubscribe _) = 8+msgType (MSubAck _) = 9+msgType (MUnsubscribe _) = 10+msgType (MUnsubAck _) = 11+msgType MPingReq = 12+msgType MPingResp = 13+msgType MDisconnect = 14
+ Network/MQTT/Logger.hs view
@@ -0,0 +1,39 @@+{-|+Module: MQTT.Logger+Copyright: Lukas Braun 2014+License: GPL-3+Maintainer: koomi+mqtt@hackerspace-bamberg.de++A simple logger abstraction.+-}+module Network.MQTT.Logger where++import System.IO++-- | Absract logger with three levels of importance.+data Logger+ = Logger+ { logInfo :: String -> IO ()+ , logWarning :: String -> IO ()+ , logError :: String -> IO ()+ }++-- | 'logInfo' prints to stdout, 'logWarning' and 'logError' to stderr+-- (with [Warning]/[Error] prefix)+stdLogger :: Logger+stdLogger = Logger+ putStrLn+ (\msg -> hPutStrLn stderr $ "[Warning] " ++ msg)+ (\msg -> hPutStrLn stderr $ "[Error] " ++ msg)++-- | Log only warnings and errors, ignoring anything passed to 'logInfo'.+warnings :: Logger -> Logger+warnings l = l { logInfo = ignore }++-- | Like 'warnings', but logs only errors.+errors :: Logger -> Logger+errors l = l { logInfo = ignore, logWarning = ignore }++-- | Ignore the message.+ignore :: String -> IO ()+ignore _ = return ()
+ Network/MQTT/Parser.hs view
@@ -0,0 +1,242 @@+{-# Language OverloadedStrings, GADTs #-}+{-|+Module: MQTT.Parsers+Copyright: Lukas Braun 2014+License: GPL-3+Maintainer: koomi+mqtt@hackerspace-bamberg.de++Parsers for MQTT messages.+-}+module Network.MQTT.Parser where++import Control.Monad+import Control.Monad.Loops+import Control.Monad.State.Strict+import Control.Applicative+import Data.Attoparsec.ByteString+import Data.Bits+import qualified Data.ByteString as BS+import Data.Singletons (withSomeSing)+import Data.Text.Encoding (decodeUtf8')+import Data.Word+import Prelude hiding (takeWhile, take)++import Network.MQTT.Types hiding (body)++-- | Type of a parser that also keeps track of the remaining length.+type MessageParser a = StateT Word32 Parser a++-- | Parse any MQTT message.+message :: Parser SomeMessage+message = do+ (msgType, header) <- mqttHeader+ remaining <- parseRemaining+ withSomeSing msgType $ \sMsgType ->+ SomeMessage . Message header <$> mqttBody header sMsgType remaining+++---------------------------------+-- * Fixed Header+---------------------------------++-- | Parser for the fixed header part of a MQTT message.+mqttHeader :: Parser (MsgType, MqttHeader)+mqttHeader = do+ byte1 <- anyWord8+ qos <- toQoS $ 3 .&. shiftR byte1 1+ let retain = testBit byte1 0+ dup = testBit byte1 3+ msgType = shiftR byte1 4+ msgType' <- case msgType of+ 1 -> return CONNECT+ 2 -> return CONNACK+ 3 -> return PUBLISH+ 4 -> return PUBACK+ 5 -> return PUBREC+ 6 -> return PUBREL+ 7 -> return PUBCOMP+ 8 -> return SUBSCRIBE+ 9 -> return SUBACK+ 10 -> return UNSUBSCRIBE+ 11 -> return UNSUBACK+ 12 -> return PINGREQ+ 13 -> return PINGRESP+ 14 -> return DISCONNECT+ x -> fail $ "Invalid message type: " ++ show x+ return (msgType', Header dup qos retain)++-- | Parse the 'remaining length' field that indicates how long the rest of+-- the message is.+parseRemaining :: Parser Word32+parseRemaining = do+ bytes <- takeWhile (> 0x7f) -- bytes with first bit set+ when (BS.length bytes > 3) $+ fail "'Remaining length' field must not be longer than 4 bytes"+ stopByte <- anyWord8+ return $ snd $ BS.foldr' f (128, fromIntegral stopByte) bytes+ where+ f byte (factor, acc) =+ (factor*128, acc + factor * fromIntegral (0x7f .&. byte))+++---------------------------------+-- * Message Body+---------------------------------++-- | «@mqttBody header msgtype remaining@» parses a 'Message' of type+-- @msgtype@ that is @remaining@ bytes long.+mqttBody :: MqttHeader -> SMsgType t -> Word32 -> Parser (MessageBody t)+mqttBody header msgType remaining =+ let parser =+ case msgType of+ SCONNECT -> MConnect <$> connect+ SCONNACK -> MConnAck <$> connAck+ SPUBLISH -> MPublish <$> publish header+ SPUBACK -> MPubAck <$> simpleMsg+ SPUBREC -> MPubRec <$> simpleMsg+ SPUBREL -> MPubRel <$> simpleMsg+ SPUBCOMP -> MPubComp <$> simpleMsg+ SSUBSCRIBE -> MSubscribe <$> subscribe+ SSUBACK -> MSubAck <$> subAck+ SUNSUBSCRIBE -> MUnsubscribe <$> unsubscribe+ SUNSUBACK -> MUnsubAck <$> simpleMsg+ SPINGREQ -> pure MPingReq+ SPINGRESP -> pure MPingResp+ SDISCONNECT -> pure MDisconnect+ in evalStateT parser remaining++connect :: MessageParser Connect+connect = do+ protocol+ version++ flags <- anyWord8'+ let clean = testBit flags 1+ willFlag = testBit flags 2+ usernameFlag = testBit flags 7+ passwordFlag = testBit flags 6++ keepAlive <- anyWord16BE++ clientID <- getClientID++ mWill <- parseIf willFlag $+ Will (testBit flags 5)+ <$> toQoS (3 .&. shiftR flags 3)+ <*> fmap toTopic mqttText+ <*> mqttText++ username <- parseIf usernameFlag mqttText++ password <- parseIf passwordFlag mqttText++ return $ Connect clean mWill clientID username password keepAlive+ where+ protocol = do+ prot <- mqttText+ when (prot /= "MQIsdp") $+ fail $ "Invalid protocol: " ++ show prot++ version = do+ version <- anyWord8'+ when (version /= 3) $+ fail $ "Invalid version: " ++ show version++ getClientID = do+ before <- get+ clientID <- mqttText+ after <- get+ let len = before - after - 2 -- 2 for length prefix+ when (len > 23) $+ fail $ "Client ID must not be longer than 23 chars: "+ ++ show (text clientID) ++ " (" ++ show len ++ ")"+ return clientID++ parseIf :: Applicative f => Bool -> f a -> f (Maybe a)+ parseIf flag parser = if flag then Just <$> parser else pure Nothing+++connAck :: MessageParser ConnAck+connAck = ConnAck <$> anyWord8'++publish :: MqttHeader -> MessageParser Publish+publish header = Publish+ <$> getTopic+ <*> (if qos header > NoConfirm+ then Just <$> parseMsgID+ else return Nothing)+ <*> (get >>= take')++subscribe :: MessageParser Subscribe+subscribe = Subscribe+ <$> parseMsgID+ <*> whileM ((0 <) <$> get)+ ((,) <$> getTopic <*> (anyWord8' >>= toQoS))++subAck :: MessageParser SubAck+subAck = SubAck+ <$> parseMsgID+ <*> whileM ((0 <) <$> get) (anyWord8' >>= toQoS)++unsubscribe :: MessageParser Unsubscribe+unsubscribe = Unsubscribe+ <$> parseMsgID+ <*> whileM ((0 <) <$> get) getTopic++simpleMsg :: MessageParser SimpleMsg+simpleMsg = SimpleMsg <$> parseMsgID+++---------------------------------+-- * Utility functions+---------------------------------++-- | Parse a topic name.+getTopic :: MessageParser Topic+getTopic = toTopic <$> mqttText++-- | Parse a length-prefixed UTF-8 string.+mqttText :: MessageParser MqttText+mqttText = do+ n <- anyWord16BE+ rslt <- decodeUtf8' <$> take' n+ case rslt of+ Left err -> fail $ "Invalid UTF-8: " ++ show err+ Right txt -> return $ MqttText txt++-- | Synonym for 'anyWord16BE'.+parseMsgID :: MessageParser Word16+parseMsgID = anyWord16BE++-- | Parse a big-endian 16bit integer.+anyWord16BE :: (Num a, Bits a) => MessageParser a+anyWord16BE = do+ msb <- anyWord8'+ lsb <- anyWord8'+ return $ shiftL (fromIntegral msb) 8 .|. fromIntegral lsb++-- | A lifted version of attoparsec's 'anyWord8' that also subtracts 1 from+-- the remaining length.+anyWord8' :: MessageParser Word8+anyWord8' = parseLength 1 >> lift anyWord8++-- | A lifted version of attoparsec's 'take' that also subtracts the+-- length.+take' :: Word32 -> MessageParser BS.ByteString+take' n = parseLength n >> lift (take (fromIntegral n))++-- | Subtract 'n' from the remaining length or 'fail' if there is not+-- enough input left.+parseLength :: Word32 -> MessageParser ()+parseLength n = do+ rem <- get+ if rem < n+ then fail "Reached remaining = 0 before end of message."+ else put $ rem - n++-- | Convert a number to a 'QoS'. 'fail' if the number can't be converted.+toQoS :: (Num a, Eq a, Show a, Monad m) => a -> m QoS+toQoS 0 = return NoConfirm+toQoS 1 = return Confirm+toQoS 2 = return Handshake+toQoS x = fail $ "Invalid QoS value: " ++ show x
+ Network/MQTT/Types.hs view
@@ -0,0 +1,322 @@+{-# Language GeneralizedNewtypeDeriving,+ PatternSynonyms,+ OverloadedStrings,+ DataKinds,+ KindSignatures,+ GADTs,+ TypeFamilies,+ ScopedTypeVariables,+ TemplateHaskell+ #-}+{-|+Module: MQTT.Types+Copyright: Lukas Braun 2014+License: GPL-3+Maintainer: koomi+mqtt@hackerspace-bamberg.de++Types representing MQTT messages.+-}+module Network.MQTT.Types+ ( -- * Messages+ Message(..)+ , SomeMessage(..)+ , MqttHeader(..)+ -- * Message bodies+ , MessageBody(..)+ , Connect(..)+ , ConnAck(..)+ , Publish(..)+ , Subscribe(..)+ , SubAck(..)+ , Unsubscribe(..)+ , SimpleMsg(..)+ -- * Miscellaneous+ , Will(..)+ , QoS(..)+ , MsgID+ , getMsgID+ , Topic+ , fromTopic+ , toTopic+ , matches+ , MqttText(..)+ -- * Message types+ , MsgType(..)+ , toMsgType+ , toMsgType'+ -- ** Singletons+ -- | Singletons are used to build a bridge between the type and value level.+ -- See the @singletons@ package for more information.+ --+ -- You do not have to use or understand these in order to use this+ -- library, they are mostly used internally to get better guarantees+ -- about the flow of 'Message's.+ , toSMsgType+ , SMsgType+ , Sing( SCONNECT+ , SCONNACK+ , SPUBLISH+ , SPUBACK+ , SPUBREC+ , SPUBREL+ , SPUBCOMP+ , SSUBSCRIBE+ , SSUBACK+ , SUNSUBSCRIBE+ , SUNSUBACK+ , SPINGREQ+ , SPINGRESP+ , SDISCONNECT)+ ) where++import Data.ByteString (ByteString)+import Data.Singletons.TH+import Data.String (IsString(..))+import Data.Text (Text)+import qualified Data.Text as T+import Data.Word++-- | A MQTT message, indexed by the type of the message ('MsgType').+data Message (t :: MsgType)+ = Message+ { header :: MqttHeader+ , body :: MessageBody t+ }++-- | Any message, hiding the index.+data SomeMessage where+ SomeMessage :: Message t -> SomeMessage++-- | Fixed header required in every message.+data MqttHeader+ = Header+ { -- msgType :: MsgType -- ^ Type of the message+ dup :: Bool -- ^ Has this message been sent before?+ , qos :: QoS -- ^ Quality of Service-level+ , retain :: Bool -- ^ Should the broker retain the message for+ -- future subscribers?+ }+ deriving (Eq, Ord, Show)++-- | The body of a MQTT message, indexed by the type of the message ('MsgType').+data MessageBody (t :: MsgType) where+ MConnect :: Connect -> MessageBody CONNECT+ MConnAck :: ConnAck -> MessageBody CONNACK+ MPublish :: Publish -> MessageBody PUBLISH+ MPubAck :: SimpleMsg -> MessageBody PUBACK+ MPubRec :: SimpleMsg -> MessageBody PUBREC+ MPubRel :: SimpleMsg -> MessageBody PUBREL+ MPubComp :: SimpleMsg -> MessageBody PUBCOMP+ MSubscribe :: Subscribe -> MessageBody SUBSCRIBE+ MSubAck :: SubAck -> MessageBody SUBACK+ MUnsubscribe :: Unsubscribe -> MessageBody UNSUBSCRIBE+ MUnsubAck :: SimpleMsg -> MessageBody UNSUBACK+ MPingReq :: MessageBody PINGREQ+ MPingResp :: MessageBody PINGRESP+ MDisconnect :: MessageBody DISCONNECT++-- | The fields of a CONNECT message.+data Connect+ = Connect+ { cleanSession :: Bool+ -- ^ Should the server forget subscriptions and other state on+ -- disconnects?+ , will :: Maybe Will+ -- ^ Optional 'Will' message.+ , clientID :: MqttText+ -- ^ Client ID used by the server to identify clients.+ , username :: Maybe MqttText+ -- ^ Optional username used for authentication.+ , password :: Maybe MqttText+ -- ^ Optional password used for authentication.+ , keepAlive :: Word16+ -- ^ Maximum interval (in seconds) in which a message must be sent.+ -- 0 means no limit.+ } deriving (Show, Eq)++-- | The response to a CONNECT. Anything other than 0 means the broker+-- refused the connection+-- (<http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#connack details>).+newtype ConnAck = ConnAck { returnCode :: Word8 }+ deriving (Show, Eq)++-- | The fields of a PUBLISH message.+data Publish+ = Publish+ { topic :: Topic+ -- ^ The 'Topic' to which the message should be published.+ , pubMsgID :: Maybe MsgID+ -- ^ 'MsgID' of the message if 'QoS' > 'NoConfirm'.+ , payload :: ByteString+ -- ^ The content that will be published.+ } deriving (Show, Eq)++-- | The fields of a SUBSCRIBE message.+data Subscribe+ = Subscribe+ { subscribeMsgID :: MsgID+ , subTopics :: [(Topic, QoS)]+ -- ^ The 'Topic's and corresponding requested 'QoS'.+ } deriving (Show, Eq)++-- | The fields of a SUBACK message.+data SubAck+ = SubAck+ { subAckMsgID :: MsgID+ , granted :: [QoS]+ -- ^ The 'QoS' granted for each 'Topic' in the order they were sent+ -- in the SUBSCRIBE.+ } deriving (Show, Eq)++-- | The fields of a UNSUBSCRIBE message.+data Unsubscribe+ = Unsubscribe+ { unsubMsgID :: MsgID+ , unsubTopics :: [Topic]+ -- ^ The 'Topic's from which the client should be unsubscribed.+ } deriving (Show, Eq)++-- | Any message body that consists only of a 'MsgID'.+newtype SimpleMsg = SimpleMsg { msgID :: MsgID }+ deriving (Show, Eq)++-- | The different levels of QoS+data QoS+ = NoConfirm -- ^ Fire and forget+ | Confirm -- ^ Acknowledged delivery (repeat until ack)+ | Handshake -- ^ Assured delivery (four-step handshake)+ deriving (Eq, Ord, Enum, Show)++-- | A Will message is published by the broker if a client disconnects+-- without sending a DISCONNECT.+data Will+ = Will+ { wRetain :: Bool+ , wQoS :: QoS+ , wTopic :: Topic+ , wMsg :: MqttText+ }+ deriving (Eq, Show)++-- | MQTT uses length-prefixed UTF-8 as text encoding.+newtype MqttText = MqttText { text :: Text }+ deriving (Eq, Show, IsString)++-- | A topic is a "hierarchical name space that defines a taxonomy of+-- information sources for which subscribers can register an interest."+--+-- See+-- <http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#appendix-a here>+-- for more information on topics.+data Topic = Topic { levels :: [Text], orig :: Text }+-- levels and orig should always refer to the same topic, this way no text+-- has to be copied when converting from/to text++type MsgID = Word16++-- | Get the message ID of any message, if it exists.+getMsgID :: MessageBody t -> Maybe MsgID+getMsgID (MConnect _) = Nothing+getMsgID (MConnAck _) = Nothing+getMsgID (MPublish pub) = pubMsgID pub+getMsgID (MPubAck simple) = Just (msgID simple)+getMsgID (MPubRec simple) = Just (msgID simple)+getMsgID (MPubRel simple) = Just (msgID simple)+getMsgID (MPubComp simple) = Just (msgID simple)+getMsgID (MSubscribe sub) = Just (subscribeMsgID sub)+getMsgID (MSubAck subA) = Just (subAckMsgID subA)+getMsgID (MUnsubscribe unsub) = Just (unsubMsgID unsub)+getMsgID (MUnsubAck simple) = Just (msgID simple)+getMsgID MPingReq = Nothing+getMsgID MPingResp = Nothing+getMsgID MDisconnect = Nothing++instance Show Topic where+ show (Topic _ t) = show t++instance Eq Topic where+ Topic _ t1 == Topic _ t2 = t1 == t2++-- | Check if one of the 'Topic's matches the other.+matches :: Topic -> Topic -> Bool+matches (Topic t1 _) (Topic t2 _) = go t1 t2+ where+ go [] [] = True+ go [] (l:_) = l == "#"+ go (l:_) [] = l == "#"+ go (l1:ls1) (l2:ls2) = l1 == "#" || l2 == "#"+ || ((l1 == "+" || l2 == "+" || l1 == l2)+ && go ls1 ls2)++toTopic :: MqttText -> Topic+toTopic (MqttText txt) = Topic (T.split (== '/') txt) txt++fromTopic :: Topic -> MqttText+fromTopic = MqttText . orig++instance IsString Topic where+ fromString str = let txt = T.pack str in+ Topic (T.split (== '/') txt) txt++-- | The various types of messages.+data MsgType+ = CONNECT+ | CONNACK+ | PUBLISH+ | PUBACK+ | PUBREC+ | PUBREL+ | PUBCOMP+ | SUBSCRIBE+ | SUBACK+ | UNSUBSCRIBE+ | UNSUBACK+ | PINGREQ+ | PINGRESP+ | DISCONNECT+ deriving (Eq, Enum, Ord, Show)++genSingletons [''MsgType]+singDecideInstance ''MsgType++-- | Determine the 'MsgType' of a 'Message'.+toMsgType :: Message t -> MsgType+toMsgType msg =+ case body msg of+ MConnect _ -> CONNECT+ MConnAck _ -> CONNACK+ MPublish _ -> PUBLISH+ MPubAck _ -> PUBACK+ MPubRec _ -> PUBREC+ MPubRel _ -> PUBREL+ MPubComp _ -> PUBCOMP+ MSubscribe _ -> SUBSCRIBE+ MSubAck _ -> SUBACK+ MUnsubscribe _ -> UNSUBSCRIBE+ MUnsubAck _ -> UNSUBACK+ MPingReq -> PINGREQ+ MPingResp -> PINGRESP+ MDisconnect -> DISCONNECT++-- | Determine the 'MsgType' of a 'SomeMessage'.+toMsgType' :: SomeMessage -> MsgType+toMsgType' (SomeMessage msg) = toMsgType msg++-- | Determine the singleton 'SMsgType' of a 'Message'.+toSMsgType :: Message t -> SMsgType t+toSMsgType msg =+ case body msg of+ MConnect _ -> SCONNECT+ MConnAck _ -> SCONNACK+ MPublish _ -> SPUBLISH+ MPubAck _ -> SPUBACK+ MPubRec _ -> SPUBREC+ MPubRel _ -> SPUBREL+ MPubComp _ -> SPUBCOMP+ MSubscribe _ -> SSUBSCRIBE+ MSubAck _ -> SSUBACK+ MUnsubscribe _ -> SUNSUBSCRIBE+ MUnsubAck _ -> SUNSUBACK+ MPingReq -> SPINGREQ+ MPingResp -> SPINGRESP+ MDisconnect -> SDISCONNECT
+ README.md view
@@ -0,0 +1,17 @@+mqtt-hs+=======++A Haskell MQTT client library.++A simple example, assuming a broker is running on localhost (needs -XOverloadedStrings):++```haskell+import Network.MQTT+import Network.MQTT.Logger+Just mqtt <- connect defaultConfig { cLogger = warnings stdLogger }+let f t payload = putStrLn $ "A message was published to " ++ show t ++ ": " ++ show payload+subscribe mqtt NoConfirm "#" f+publish mqtt Handshake False "some random/topic" "Some content!"+```++See the haddock for more documentation.
+ Setup.hs view
@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain
+ mqtt-hs.cabal view
@@ -0,0 +1,40 @@+-- Initial mqtt-hs.cabal generated by cabal init. For further+-- documentation, see http://haskell.org/cabal/users-guide/++name: mqtt-hs+version: 0.2.0+synopsis: A MQTT client library.+homepage: github.com/k00mi/mqtt-hs+license: GPL-3+license-file: LICENSE+author: Lukas Braun <koomi+mqtt@hackerspace-bamberg.de>+maintainer: Lukas Braun <koomi+mqtt@hackerspace-bamberg.de>+copyright: (c) 2014 Lukas Braun+category: Network+build-type: Simple+extra-source-files: README.md+cabal-version: >=1.10+stability: experimental+description:+ A library to communicate with MQTT brokers.++ See the @Network.MQTT@ module for documentation and a small example.+++library+ exposed-modules: Network.MQTT, Network.MQTT.Parser, Network.MQTT.Encoding,+ Network.MQTT.Types, Network.MQTT.Logger+ build-depends: base >=4.7 && <4.8,+ mtl >=1.1 && <2.3,+ attoparsec >=0.10 && <0.13,+ bytestring >=0.10.2 && <0.11,+ text >=0.11.0.6 && <1.2,+ network >=2.0 && <2.7,+ singletons >=0.9 && < 1.1,+ monad-loops >=0.3 && <0.5+ default-language: Haskell2010+++source-repository head+ type: git+ location: git://github.com/k00mi/mqtt-hs.git