-----------------------------------------------------------------------------
--
-- Module : Transient.Move.Internals
-- Copyright :
-- License : MIT
--
-- Maintainer : agocorona@gmail.com
-- Stability :
-- Portability :
--
-- |
--
-----------------------------------------------------------------------------
{-# LANGUAGE DeriveDataTypeable , ExistentialQuantification, OverloadedStrings
,ScopedTypeVariables, StandaloneDeriving, RecordWildCards, FlexibleContexts, CPP
,GeneralizedNewtypeDeriving #-}
module Transient.Move.Internals where
import Transient.Internals
import Transient.Logged
import Transient.Indeterminism(choose)
import Transient.Backtrack
import Transient.EVars
import Data.Typeable
import Control.Applicative
#ifndef ghcjs_HOST_OS
import Network
import Network.Info
import Network.URI
--import qualified Data.IP as IP
import qualified Network.Socket as NS
import qualified Network.BSD as BSD
import qualified Network.WebSockets as NWS -- S(RequestHead(..))
import qualified Network.WebSockets.Connection as WS
import Network.WebSockets.Stream hiding(parse)
import qualified Data.ByteString as B(ByteString,concat)
import qualified Data.ByteString.Char8 as BC
import qualified Data.ByteString.Lazy.Internal as BLC
import qualified Data.ByteString.Lazy as BL
import qualified Data.ByteString.Lazy.Char8 as BS
import Network.Socket.ByteString as SBS(send,sendMany,sendAll,recv)
import qualified Network.Socket.ByteString.Lazy as SBSL
import Data.CaseInsensitive(mk)
import Data.Char(isSpace)
#else
import JavaScript.Web.WebSocket
import qualified JavaScript.Web.MessageEvent as JM
import GHCJS.Prim (JSVal)
import GHCJS.Marshal(fromJSValUnchecked)
import qualified Data.JSString as JS
import JavaScript.Web.MessageEvent.Internal
import GHCJS.Foreign.Callback.Internal (Callback(..))
import qualified GHCJS.Foreign.Callback as CB
import Data.JSString (JSString(..), pack)
#endif
import Control.Monad.State
import System.IO
import Control.Exception hiding (onException,try)
import Data.Maybe
--import Data.Hashable
--import System.Directory
import Control.Monad
import System.IO.Unsafe
import Control.Concurrent.STM as STM
import Control.Concurrent.MVar
import Data.Monoid
import qualified Data.Map as M
import Data.List (nub,(\\),find, insert)
import Data.IORef
import System.IO
import Control.Concurrent
import Data.Dynamic
import Data.String
import System.Mem.StableName
import Unsafe.Coerce
--import System.Random
#ifdef ghcjs_HOST_OS
type HostName = String
newtype PortID = PortNumber Int deriving (Read, Show, Eq, Typeable)
#endif
data Node= Node{ nodeHost :: HostName
, nodePort :: Int
, connection :: MVar Pool
, nodeServices :: [Service]
}
deriving (Typeable)
instance Ord Node where
compare node1 node2= compare (nodeHost node1,nodePort node1)(nodeHost node2,nodePort node2)
-- The cloud monad is a thin layer over Transient in order to make sure that the type system
-- forces the logging of intermediate results
newtype Cloud a= Cloud {runCloud' ::TransIO a} deriving (Functor,Applicative,Monoid,Alternative, Monad, Num, MonadState EventF)
runCloud x= do
closRemote <- getSData <|> return (Closure 0)
runCloud' x <*** setData closRemote
--instance Monoid a => Monoid (Cloud a) where
-- mappend x y = mappend <$> x <*> y
-- mempty= return mempty
#ifndef ghcjs_HOST_OS
--- empty Hooks for TLS
tlsHooks ::IORef (SData -> BS.ByteString -> IO ()
,SData -> IO B.ByteString
,NS.Socket -> BS.ByteString -> TransIO ()
,String -> NS.Socket -> BS.ByteString -> TransIO ())
tlsHooks= unsafePerformIO $ newIORef
( notneeded
, notneeded
, \s i -> tlsNotSupported i
, \_ _ _-> return())
where
notneeded= error "TLS hook function called"
tlsNotSupported input = do
if ((not $ BL.null input) && BL.head input == 0x16)
then do
conn <- getSData
sendRaw conn $ BS.pack $ "HTTP/1.0 525 SSL Handshake Failed\nContent-Length: 0\nConnection: close\n\n"
else return ()
(sendTLSData,recvTLSData,maybeTLSServerHandshake,maybeClientTLSHandshake)= unsafePerformIO $ readIORef tlsHooks
#endif
-- | Means that this computation will be executed in the current node. the result will be logged
-- so the closure will be recovered if the computation is translated to other node by means of
-- primitives like `beamTo`, `forkTo`, `runAt`, `teleport`, `clustered`, `mclustered` etc
local :: Loggable a => TransIO a -> Cloud a
local = Cloud . logged
--stream :: Loggable a => TransIO a -> Cloud (StreamVar a)
--stream= Cloud . transport
-- #ifndef ghcjs_HOST_OS
-- | run the cloud computation.
runCloudIO :: Typeable a => Cloud a -> IO (Maybe a)
runCloudIO (Cloud mx)= keep mx
-- | run the cloud computation with no console input
runCloudIO' :: Typeable a => Cloud a -> IO (Maybe a)
runCloudIO' (Cloud mx)= keep' mx
-- #endif
-- | alternative to `local` It means that if the computation is translated to other node
-- this will be executed again if this has not been executed inside a `local` computation.
--
-- > onAll foo
-- > local foo'
-- > local $ do
-- > bar
-- > runCloud $ do
-- > onAll baz
-- > runAt node ....
-- > callTo node' .....
--
-- Here foo will be executed in node' but foo' bar and baz don't.
--
-- However foo bar and baz will e executed in node.
--
onAll :: TransIO a -> Cloud a
onAll = Cloud
lazy :: TransIO a -> Cloud a
lazy mx= onAll $ getCont >>= \st -> Transient $
return $ unsafePerformIO $ runStateT (runTrans mx) st >>= return .fst
-- log the result a cloud computation. like `loogged`, This eliminated all the log produced by computations
-- inside and substitute it for that single result when the computation is completed.
loggedc :: Loggable a => Cloud a -> Cloud a
loggedc (Cloud mx)= Cloud $ do
closRemote <- getSData <|> return (Closure 0 )
logged mx <*** setData closRemote
loggedc' :: Loggable a => Cloud a -> Cloud a
loggedc' (Cloud mx)= Cloud $ logged mx
-- | the `Cloud` monad has no `MonadIO` instance. `lliftIO= local . liftIO`
lliftIO :: Loggable a => IO a -> Cloud a
lliftIO= local . liftIO
-- | locally perform IO. `localIO = lliftIO`
localIO :: Loggable a => IO a -> Cloud a
localIO= lliftIO
--remote :: Loggable a => TransIO a -> Cloud a
--remote x= Cloud $ step' x $ \full x -> Transient $ do
-- let add= Wormhole: full
-- setData $ Log False add add
--
-- r <- runTrans x
--
-- let add= WaitRemote: full
-- (setData $ Log False add add) -- !!> "AFTER STEP"
-- return r
-- | stop the current computation and does not execute any alternative computation
fullStop :: Cloud stop
fullStop= onAll $ setData WasRemote >> stop
-- | continue the execution in a new node
-- all the previous actions from `listen` to this statement must have been logged
beamTo :: Node -> Cloud ()
beamTo node = wormhole node teleport
-- | execute in the remote node a process with the same execution state
forkTo :: Node -> Cloud ()
forkTo node= beamTo node <|> return()
-- | open a wormhole to another node and executes an action on it.
-- currently by default it keep open the connection to receive additional requests
-- and responses (streaming)
callTo :: Loggable a => Node -> Cloud a -> Cloud a
callTo node remoteProc=
wormhole node $ atRemote remoteProc
#ifndef ghcjs_HOST_OS
-- | A connectionless version of callTo for long running remote calls
callTo' :: (Show a, Read a,Typeable a) => Node -> Cloud a -> Cloud a
callTo' node remoteProc= do
mynode <- local getMyNode
beamTo node
r <- remoteProc
beamTo mynode
return r
#endif
-- | Within an open connection to other node opened by `wormhole`, it run the computation in the remote node and return
-- the result back to the original node.
atRemote proc= loggedc' $ do
teleport -- !> "teleport 1111"
r <- Cloud $ runCloud proc <** setData WasRemote
teleport -- !> "teleport 2222"
return r
-- | synonymous of `callTo`
runAt :: Loggable a => Node -> Cloud a -> Cloud a
runAt= callTo
-- | run a single thread with that action for each connection created.
-- When the same action is re-executed within that connection, all the threads generated by the previous execution
-- are killed
--
-- > box <- foo
-- > r <- runAt node . local . single $ getMailbox box
-- > localIO $ print r
--
-- if foo return differnt mainbox indentifiers, the above code would print the
-- messages of the last one.
-- Without single, it would print the messages of all of them.
single :: TransIO a -> TransIO a
single f= do
cutExceptions
con@Connection{closChildren=rmap} <- getSData <|> error "single: only works within a wormhole"
mapth <- liftIO $ readIORef rmap
id <- liftIO $ f `seq` makeStableName f >>= return . hashStableName
case M.lookup id mapth of
Just tv -> killBranch' tv -- !> "JUSTTTTTTTTT"
Nothing -> return () -- !> "NOTHING"
tv <- get
f <** do
id <- liftIO $ makeStableName f >>= return . hashStableName
liftIO $ modifyIORef rmap $ \mapth -> M.insert id tv mapth
-- | run an unique continuation for each connection. The first thread that execute `unique` is
-- executed for that connection. The rest are ignored.
unique :: a -> TransIO ()
unique f= do
con@Connection{closChildren=rmap} <- getSData <|> error "unique: only works within a connection. Use wormhole"
mapth <- liftIO $ readIORef rmap
id <- liftIO $ f `seq` makeStableName f >>= return . hashStableName
let mx = M.lookup id mapth
case mx of
Just tv -> empty
Nothing -> do
tv <- get
liftIO $ modifyIORef rmap $ \mapth -> M.insert id tv mapth
-- | A wormhole opens a connection with another node anywhere in a computation.
-- `teleport` uses this connection to translate the computation back and forth between the two nodes connected
wormhole :: Loggable a => Node -> Cloud a -> Cloud a
wormhole node (Cloud comp) = local $ Transient $ do
moldconn <- getData :: StateIO (Maybe Connection)
mclosure <- getData :: StateIO (Maybe Closure)
labelState $ "wormhole" ++ show node
logdata@(Log rec log fulLog) <- getData `onNothing` return (Log False [][])
mynode <- runTrans getMyNode -- debug
if not rec -- !> ("wormhole recovery", rec)
then runTrans $ (do
conn <- mconnect node
setData conn{calling= True}
comp )
<*** do when (isJust moldconn) . setData $ fromJust moldconn
when (isJust mclosure) . setData $ fromJust mclosure
-- <** is not enough
else do
let conn = fromMaybe (error "wormhole: no connection in remote node") moldconn
-- conn <- getData `onNothing` error "wormhole: no connection in remote node"
setData $ conn{calling= False}
runTrans $ comp
<*** do
-- when (null log) $ setData WasRemote !> "NULLLOG"
when (isJust mclosure) . setData $ fromJust mclosure
#ifndef ghcjs_HOST_OS
type JSString= String
pack= id
#endif
--
--newtype Prefix= Prefix JSString deriving(Read,Show)
--{-#NOINLINE rprefix #-}
--rprefix= unsafePerformIO $ newIORef 0
--addPrefix :: (MonadIO m, MonadState EventF m) => m ()
--addPrefix= do
-- r <- liftIO $ atomicModifyIORef rprefix (\n -> (n+1,n)) -- liftIO $ replicateM 5 (randomRIO ('a','z'))
-- (setData $ Prefix $ pack $ show r) !> "addPrefix"
--
-- | translates computations back and forth between two nodes
-- reusing a connection opened by `wormhole`
--
-- each teleport transport to the other node what is new in the log since the
-- last teleport
--
-- It is used trough other primitives like `runAt` which involves two teleports:
--
-- runAt node= wormhole node $ loggedc $ do
-- > teleport
-- > r <- Cloud $ runCloud proc <** setData WasRemote
-- > teleport
-- > return r
teleport :: Cloud ()
teleport = do
local $ Transient $ do
cont <- get
labelState "teleport"
-- send log with closure at head
Log rec log fulLog <- getData `onNothing` return (Log False [][])
if not rec -- !> ("teleport rec,loc fulLog=",rec,log,fulLog)
-- if is not recovering in the remote node then it is active
then do
conn@Connection{connData=contype,closures= closures,calling= calling} <- getData
`onNothing` error "teleport: No connection defined: use wormhole"
#ifndef ghcjs_HOST_OS
case contype of
Just Self -> do
setData $ if (not calling) then WasRemote else WasParallel
runTrans $ async $ return () -- !> "SELF" -- call himself
_ -> do
#else
do
#endif
--read this Closure
Closure closRemote <- getData `onNothing` return (Closure 0 )
--set his own closure in his Node data
let closLocal = sum $ map (\x-> case x of Wait -> 100000;
Exec -> 1000
_ -> 1) fulLog
-- closLocal <- liftIO $ randomRIO (0,1000000)
node <- runTrans getMyNode
liftIO $ modifyMVar_ closures $ \map -> return $ M.insert closLocal (fulLog,cont) map
let tosend= reverse $ if closRemote==0 then fulLog else log
runTrans $ msend conn $ SMore (closRemote,closLocal,tosend )
-- !> ("teleport sending", SMore (closRemote,closLocal,tosend))
-- !> "--------->------>---------->"
-- !> ("fulLog", fulLog)
setData $ if (not calling) then WasRemote else WasParallel
return Nothing
else do
delData WasRemote -- !> "deleting wasremote in teleport"
-- it is recovering, therefore it will be the
-- local, not remote
return (Just ()) -- !> "TELEPORT remote"
-- | copy a session data variable from the local to the remote node.
-- If there is none set in the local node, The parameter is the default value.
-- In this case, the default value is also set in the local node.
copyData def = do
r <- local getSData <|> return def
onAll $ setData r
return r
-- | write to the mailbox
-- Mailboxes are node-wide, for all processes that share the same connection data, that is, are under the
-- same `listen` or `connect`
-- while EVars are only visible by the process that initialized it and his children.
-- Internally, the mailbox is in a well known EVar stored by `listen` in the `Connection` state.
putMailbox :: Typeable a => a -> TransIO ()
putMailbox = putMailbox' 0
-- | write to a mailbox identified by an Integer besides the type
putMailbox' :: Typeable a => Int -> a -> TransIO ()
putMailbox' idbox dat= do
let name= MailboxId idbox $ typeOf dat
Connection{comEvent= mv} <- getData `onNothing` errorMailBox
mbs <- liftIO $ readIORef mv
let mev = M.lookup name mbs
case mev of
Nothing ->newMailbox name >> putMailbox' idbox dat
Just ev -> writeEVar ev $ unsafeCoerce dat
newMailbox :: MailboxId -> TransIO ()
newMailbox name= do
-- return () -- !> "newMailBox"
Connection{comEvent= mv} <- getData `onNothing` errorMailBox
ev <- newEVar
liftIO $ atomicModifyIORef mv $ \mailboxes -> (M.insert name ev mailboxes,())
errorMailBox= error "MailBox: No connection open. Use wormhole"
-- | get messages from the mailbox that matches with the type expected.
-- The order of reading is defined by `readTChan`
-- This is reactive. it means that each new message trigger the execution of the continuation
-- each message wake up all the `getMailbox` computations waiting for it.
getMailbox :: Typeable a => TransIO a
getMailbox = getMailbox' 0
-- | read from a mailbox identified by a number besides the type
getMailbox' :: Typeable a => Int -> TransIO a
getMailbox' mboxid = x where
x = do
let name= MailboxId mboxid $ typeOf $ typeOf1 x
Connection{comEvent= mv} <- getData `onNothing` errorMailBox
mbs <- liftIO $ readIORef mv
let mev = M.lookup name mbs
case mev of
Nothing ->newMailbox name >> getMailbox' mboxid
Just ev ->unsafeCoerce $ readEVar ev
typeOf1 :: TransIO a -> a
typeOf1 = undefined
-- | delete all subscriptions for that mailbox expecting this kind of data
cleanMailbox :: Typeable a => a -> TransIO ()
cleanMailbox = cleanMailbox' 0
-- | clean a mailbox identified by an Int and the type
cleanMailbox' :: Typeable a => Int -> a -> TransIO ()
cleanMailbox' mboxid witness= do
let name= MailboxId mboxid $ typeOf witness
Connection{comEvent= mv} <- getData `onNothing` error "getMailBox: accessing network events out of listen"
mbs <- liftIO $ readIORef mv
let mev = M.lookup name mbs
case mev of
Nothing -> return()
Just ev -> do cleanEVar ev
liftIO $ atomicModifyIORef mv $ \mbs -> (M.delete name mbs,())
-- | execute a Transient action in each of the nodes connected.
--
-- The response of each node is received by the invoking node and processed by the rest of the procedure.
-- By default, each response is processed in a new thread. To restrict the number of threads
-- use the thread control primitives.
--
-- this snippet receive a message from each of the simulated nodes:
--
-- > main = keep $ do
-- > let nodes= map createLocalNode [2000..2005]
-- > addNodes nodes
-- > (foldl (<|>) empty $ map listen nodes) <|> return ()
-- >
-- > r <- clustered $ do
-- > Connection (Just(PortNumber port, _, _, _)) _ <- getSData
-- > return $ "hi from " ++ show port++ "\n"
-- > liftIO $ putStrLn r
-- > where
-- > createLocalNode n= createNode "localhost" (PortNumber n)
clustered :: Loggable a => Cloud a -> Cloud a
clustered proc= callNodes (<|>) empty proc
-- A variant of `clustered` that wait for all the responses and `mappend` them
mclustered :: (Monoid a, Loggable a) => Cloud a -> Cloud a
mclustered proc= callNodes (<>) mempty proc
callNodes op init proc= loggedc' $ do
nodes <- local getNodes
let nodes' = filter (not . isWebNode) nodes
callNodes' nodes' op init proc
where
isWebNode Node {nodeServices=srvs}
| ("webnode","") `elem` srvs = True
| otherwise = False
callNodes' nodes op init proc= foldr op init $ map (\node -> runAt node proc) nodes
-----
#ifndef ghcjs_HOST_OS
sendRaw (Connection _(Just (Node2Web sconn )) _ _ _ _ _ _) r=
liftIO $ WS.sendTextData sconn r -- !> ("NOde2Web",r)
sendRaw (Connection _(Just (Node2Node _ sock _)) _ _ blocked _ _ _) r=
liftIO $ withMVar blocked $ const $ SBS.sendMany sock
(BL.toChunks r ) -- !> ("NOde2Node",r)
sendRaw (Connection _(Just (TLSNode2Node ctx )) _ _ blocked _ _ _) r=
liftIO $ withMVar blocked $ const $ sendTLSData ctx r -- !> ("TLNode2Web",r)
#else
sendRaw (Connection _ (Just (Web2Node sconn)) _ _ blocked _ _ _) r= liftIO $
withMVar blocked $ const $ JavaScript.Web.WebSocket.send r sconn -- !!> "MSEND SOCKET"
#endif
msend :: Loggable a => Connection -> StreamData a -> TransIO ()
#ifndef ghcjs_HOST_OS
msend (Connection _(Just (Node2Node _ sock _)) _ _ blocked _ _ _) r=
liftIO $ withMVar blocked $ const $ SBS.sendAll sock $ BC.pack (show r) -- !> "N2N SEND"
msend (Connection _(Just (TLSNode2Node ctx)) _ _ blocked _ _ _) r=
liftIO $ sendTLSData ctx $ BS.pack (show r) -- !> "TLS SEND"
msend (Connection _(Just (Node2Web sconn)) _ _ blocked _ _ _) r=liftIO $
{-withMVar blocked $ const $ -} WS.sendTextData sconn $ BS.pack (show r) -- !> "websockets send"
#else
msend (Connection _ (Just (Web2Node sconn)) _ _ blocked _ _ _) r= liftIO $
withMVar blocked $ const $ JavaScript.Web.WebSocket.send (JS.pack $ show r) sconn -- !!> "MSEND SOCKET"
#endif
msend (Connection _ Nothing _ _ _ _ _ _) _= error "msend out of wormhole context"
mread :: Loggable a => Connection -> TransIO (StreamData a)
#ifdef ghcjs_HOST_OS
mread (Connection _ (Just (Web2Node sconn)) _ _ _ _ _ _)= wsRead sconn
wsRead :: Loggable a => WebSocket -> TransIO a
wsRead ws= do
dat <- react (hsonmessage ws) (return ())
case JM.getData dat of
JM.StringData str -> return (read' $ JS.unpack str)
-- !> ("Browser webSocket read", str) !> "<------<----<----<------"
JM.BlobData blob -> error " blob"
JM.ArrayBufferData arrBuffer -> error "arrBuffer"
wsOpen :: JS.JSString -> TransIO WebSocket
wsOpen url= do
ws <- liftIO $ js_createDefault url -- !> ("wsopen",url)
react (hsopen ws) (return ()) -- !!> "react"
return ws -- !!> "AFTER ReACT"
foreign import javascript safe
"window.location.hostname"
js_hostname :: JSVal
foreign import javascript safe
"window.location.protocol"
js_protocol :: JSVal
foreign import javascript safe
"(function(){var res=window.location.href.split(':')[2];if (res === undefined){return 80} else return res.split('/')[0];})()"
js_port :: JSVal
foreign import javascript safe
"$1.onmessage =$2;"
js_onmessage :: WebSocket -> JSVal -> IO ()
getWebServerNode :: TransIO Node
getWebServerNode = liftIO $ do
h <- fromJSValUnchecked js_hostname
p <- fromIntegral <$> (fromJSValUnchecked js_port :: IO Int)
createNode h p
hsonmessage ::WebSocket -> (MessageEvent ->IO()) -> IO ()
hsonmessage ws hscb= do
cb <- makeCallback MessageEvent hscb
js_onmessage ws cb
foreign import javascript safe
"$1.onopen =$2;"
js_open :: WebSocket -> JSVal -> IO ()
newtype OpenEvent = OpenEvent JSVal deriving Typeable
hsopen :: WebSocket -> (OpenEvent ->IO()) -> IO ()
hsopen ws hscb= do
cb <- makeCallback OpenEvent hscb
js_open ws cb
makeCallback :: (JSVal -> a) -> (a -> IO ()) -> IO JSVal
makeCallback f g = do
Callback cb <- CB.syncCallback1 CB.ContinueAsync (g . f)
return cb
foreign import javascript safe
"new WebSocket($1)" js_createDefault :: JS.JSString -> IO WebSocket
#else
mread (Connection _(Just (Node2Node _ _ _)) _ _ _ _ _ _) = parallelReadHandler -- !> "mread"
mread (Connection _(Just (TLSNode2Node ctx)) _ _ _ _ _ _) = parallelReadHandler
-- parallel $ do
-- s <- recvTLSData ctx
-- return . read' $ BC.unpack s
mread (Connection node (Just (Node2Web sconn )) _ _ _ _ _ _)=
parallel $ do
s <- WS.receiveData sconn
return . read' $ BS.unpack s
-- !> ("WS MREAD RECEIVED ---->", s)
getWebServerNode :: TransIO Node
getWebServerNode = getMyNode
#endif
read' s= case readsPrec' 0 s of
[(x,"")] -> x
_ -> error $ "reading " ++ s
--release (Node h p rpool _) hand= liftIO $ do
---- print "RELEASED"
-- atomicModifyIORef rpool $ \ hs -> (hand:hs,())
-- -- !!> "RELEASED"
mclose :: Connection -> IO ()
#ifndef ghcjs_HOST_OS
mclose (Connection _
(Just (Node2Node _ sock _ )) _ _ _ _ _ _)= NS.close sock
mclose (Connection node
(Just (Node2Web sconn ))
bufSize events blocked _ _ _)=
WS.sendClose sconn ("closemsg" :: BS.ByteString)
#else
mclose (Connection _ (Just (Web2Node sconn)) _ _ blocked _ _ _)=
JavaScript.Web.WebSocket.close Nothing Nothing sconn
#endif
mconnect :: Node -> TransIO Connection
mconnect node@(Node _ _ _ _ )= do
nodes <- getNodes
let fnode = filter (==node) nodes
case fnode of
[] -> addNodes [node] >> mconnect node
[Node host port pool _] -> do
plist <- liftIO $ readMVar pool
case plist of -- !> ("length",length plist) of
handle:_ -> do
delData $ Closure undefined
return handle
-- !> ("REUSED!", node)
_ -> mconnect1 host port pool -- !> ("MCONNECT1",host,port)
where
#ifndef ghcjs_HOST_OS
mconnect1 host port pool= do
connectNode2Node host port <|> connectWebSockets host port
watchConnection
where
connectSockTLS host port= do
return () -- !> "connectSockTLS"
my <- getMyNode
let size=8192
Connection{comEvent= ev} <- getSData <|> error "connect: listen not set for this node"
sock <- liftIO $connectTo' size host $ PortNumber $ fromIntegral port
conn' <- liftIO $ defConnection >>= \c ->
return c{myNode=my,comEvent= ev,connData=
Just $ Node2Node u sock (error $ "addr: outgoing connection")}
setData conn'
input <- liftIO $ SBSL.getContents sock
setData $ ParseContext (error "listenResponses: Parse error") input
maybeClientTLSHandshake host sock input
connectNode2Node host port= do
connectSockTLS host port
-- return () !> "CONNECT NODE2NODE"
conn <- getSData <|> error "mconnect: no connection data"
sendRaw conn "CLOS a b\r\n\r\n"
r <- -- async (threadDelay 2000000 >> return Nothing) <|>
liftIO $ readFrom conn
-- (liftIO $ NS.recv sock 1000 >>= return . Just )
-- return () !> ("READ",r)
case r of
"OK" -> return()
_ -> do
let Connection{connData=cdata}= conn
case cdata of
Just(Node2Node _ s _) -> liftIO $ NS.close s -- since the HTTP firewall closes the connection
-- TLSNode2Node c -> contextClose c -- TODO
empty --- close socket,tls
connectWebSockets host port = do
liftIO $ print "Trying WebSockets"
connectSockTLS host port -- a new connection
-- return () !> "connected"
never<- liftIO $ newEmptyMVar :: TransIO (MVar ())
conn <- getSData <|> error "connectWebSockets: no connection"
stream <- liftIO $ makeWSStreamFromConn conn
wscon <- react (NWS.runClientWithStream stream host "/"
WS.defaultConnectionOptions []) (takeMVar never)
liftIO $ print "WebSockets connection"
modifyState $ \(Just c) -> Just c{connData= Just $ Node2Web wscon}
-- noConnection= error $ show node ++ ": no connection"
watchConnection= do
conn <- getSData
parseContext <- getSData <|> error "NO PASE CONTEXT"
:: TransIO (ParseContext BS.ByteString)
chs <- liftIO $ newIORef M.empty
let conn'= conn{closChildren= chs}
(liftIO $ modifyMVar_ pool $ \plist -> return $ conn':plist) -- !> (node,"ADDED TO POOL")
-- tell listenResponses to watch incoming responses
putMailbox ((conn',parseContext,node) -- !> "PUTMAILBOX"
:: (Connection,ParseContext BS.ByteString,Node))
delData $ Closure undefined
return conn
#else
mconnect1 host port pool= do
my <- getMyNode
Connection{comEvent= ev} <- getSData <|> error "connect: listen not set for this node"
do
ws <- connectToWS host $ PortNumber $ fromIntegral port
-- !> "CONNECTWS"
conn <- defConnection >>= \c -> return c{comEvent= ev,connData= Just $ Web2Node ws}
-- !> ("websocker CONNECION")
let parseContext =
ParseContext (error "parsecontext not available in the browser")
("" :: JSString)
chs <- liftIO $ newIORef M.empty
let conn'= conn{closChildren= chs}
liftIO $ modifyMVar_ pool $ \plist -> return $ conn':plist
putMailbox (conn',parseContext,node) -- tell listenResponses to watch incoming responses
delData $ Closure undefined
return conn
#endif
u= undefined
-- mconnect _ = empty
#ifndef ghcjs_HOST_OS
connectTo' bufSize hostname (PortNumber port) = do
proto <- BSD.getProtocolNumber "tcp"
bracketOnError
(NS.socket NS.AF_INET NS.Stream proto)
(sClose) -- only done if there's an error
(\sock -> do
NS.setSocketOption sock NS.RecvBuffer bufSize
NS.setSocketOption sock NS.SendBuffer bufSize
-- NS.setSocketOption sock NS.SendTimeOut 1000000 !> ("CONNECT",port)
he <- BSD.getHostByName hostname
NS.connect sock (NS.SockAddrInet port (BSD.hostAddress he))
return sock)
#else
connectToWS h (PortNumber p) = do
protocol <- liftIO $ fromJSValUnchecked js_protocol
let ps = case (protocol :: JSString)of "http:" -> "ws://"; "https:" -> "wss://"
wsOpen $ JS.pack $ ps++ h++ ":"++ show p
#endif
type Blocked= MVar ()
type BuffSize = Int
data ConnectionData=
#ifndef ghcjs_HOST_OS
Node2Node{port :: PortID
,socket ::Socket
,remoteNode :: NS.SockAddr
}
| TLSNode2Node{tlscontext :: SData}
| Node2Web{webSocket :: WS.Connection}
-- | WS2Node{webSocketNode :: WS.Connection}
| Self
#else
Self
| Web2Node{webSocket :: WebSocket}
#endif
data MailboxId= MailboxId Int TypeRep deriving (Eq,Ord)
data Connection= Connection{myNode :: Node
,connData :: Maybe(ConnectionData)
,bufferSize :: BuffSize
-- Used by getMailBox, putMailBox
,comEvent :: IORef (M.Map MailboxId (EVar SData))
-- multiple wormhole/teleport use the same connection concurrently
,blocked :: Blocked
,calling :: Bool
-- local closures with his log and his continuation
,closures :: MVar (M.Map IdClosure ([LogElem], EventF))
-- for each remote closure that points to local closure 0,
-- a new container of child processes
-- in order to treat them separately
-- so that 'killChilds' do not kill unrelated processes
,closChildren :: IORef (M.Map Int EventF)}
deriving Typeable
defConnection :: MonadIO m => m Connection
-- #ifndef ghcjs_HOST_OS
defConnection = liftIO $ do
x <- newMVar ()
y <- newMVar M.empty
z <- return $ error "closchildren newIORef M.empty"
return $ Connection (error "node in default connection") Nothing 8192
(error "defConnection: accessing network events out of listen")
x False y z
#ifndef ghcjs_HOST_OS
setBuffSize :: Int -> TransIO ()
setBuffSize size= Transient $ do
conn<- getData `onNothing` defConnection
setData $ conn{bufferSize= size}
return $ Just ()
getBuffSize=
(do getSData >>= return . bufferSize) <|> return 8192
listen :: Node -> Cloud ()
listen (node@(Node _ port _ _ )) = onAll $ do
addThreads 1
setData $ Log False [] []
conn' <- getSData <|> defConnection
ev <- liftIO $ newIORef M.empty
chs <- liftIO $ newIORef M.empty
let conn= conn'{connData=Just Self,myNode=node, comEvent=ev,closChildren=chs}
setData conn
liftIO $ modifyMVar_ (connection node) $ const $ return [conn]
addNodes [node]
mlog <- listenNew (fromIntegral port) conn <|> listenResponses
execLog mlog
-- listen incoming requests
listenNew port conn'= do
sock <- liftIO . listenOn $ PortNumber port
let bufSize= bufferSize conn'
liftIO $ do NS.setSocketOption sock NS.RecvBuffer bufSize
NS.setSocketOption sock NS.SendBuffer bufSize
(sock,addr) <- waitEvents $ NS.accept sock
chs <- liftIO $ newIORef M.empty
-- case addr of
-- NS.SockAddrInet port host -> liftIO $ print("connection from", port, host)
-- NS.SockAddrInet6 a b c d -> liftIO $ print("connection from", a, b,c,d)
let conn= conn'{closChildren=chs}
input <- liftIO $ SBSL.getContents sock
setData $ (ParseContext (error "parsing request") input
::ParseContext BS.ByteString)
cutExceptions
onException $ \(e :: SomeException) -> do
liftIO $ print e
let Connection{closures=closures,closChildren= rmap}= conn
liftIO $ do
modifyMVar_ closures $ const $ return M.empty
writeIORef rmap M.empty
topState >>= showThreads
killBranch
setState conn{connData=Just (Node2Node (PortNumber port) sock addr)}
maybeTLSServerHandshake sock input
(method,uri, headers) <- receiveHTTPHead
case method of
"CLOS" ->
do
conn <- getSData
sendRaw conn "OK" -- !> "CLOS detected"
parallelReadHandler
_ -> do
let uri'= BC.tail $ uriPath uri
if "api/" `BC.isPrefixOf` uri'
then do
log <- return $ Exec: (Var $ IDyns $ BS.unpack method):(map (Var . IDyns ) $ split $ BC.unpack $ BC.drop 4 uri')
str <- giveData <|> error "no api data"
log' <- case (method,lookup "Content-Type" headers) of
("POST",Just "application/x-www-form-urlencoded") -> do
len <- read <$> BC.unpack
<$> (Transient $ return (lookup "Content-Length" headers))
setData $ ParseContext (return mempty) $ BS.take len str
postParams <- parsePostUrlEncoded <|> return []
return $ log ++ [(Var . IDynamic $ postParams)]
_ -> return $ log -- ++ [Var $ IDynamic str]
return $ SMore (0,0, log' )
else do
-- stay serving pages until a websocket request is received
servePages (method, uri', headers)
conn <- getSData
sconn <- makeWebsocketConnection conn uri headers
-- websockets mode
setData conn{connData= Just (Node2Web sconn) ,closChildren=chs}
-- async (return (SMore (0,0,[Exec]))) <|> do
do
return () -- !> "WEBSOCKET"
r <- parallel $ do
msg <- WS.receiveData sconn
-- return () !> ("Server WebSocket msg read",msg)
-- !> "<-------<---------<--------------"
case reads $ BS.unpack msg of
[] -> do
let log =Exec: [Var $ IDynamic (msg :: BS.ByteString)]
return $ SMore (0,0,log)
((x ,_):_) -> return (x :: StreamData (Int,Int,[LogElem]))
case r of
SError e -> do
-- liftIO $ WS.sendClose sconn ("error" :: BS.ByteString)
finish (Just e)
-- !> "FINISH1"
_ -> return r
where
uriPath = BC.dropWhile (/= '/')
split []= []
split ('/':r)= split r
split s=
let (h,t) = span (/= '/') s
in h: split t
--instance Read PortNumber where
-- readsPrec n str= let [(n,s)]= readsPrec n str in [(fromIntegral n,s)]
--deriving instance Read PortID
--deriving instance Typeable PortID
#endif
listenResponses :: Loggable a => TransIO (StreamData a)
listenResponses= do
(conn, parsecontext, node) <- getMailbox
labelState $ "listen from: "++ show node
-- return () !> ("LISTEN FROM",node)
setData conn
#ifndef ghcjs_HOST_OS
setData (parsecontext :: ParseContext BS.ByteString)
#else
setData (parsecontext :: ParseContext JSString)
#endif
cutExceptions
onException (\(e:: SomeException) -> do
liftIO $ print e
liftIO $ putStr "removing2 node: " >> print node
nodes <- getNodes
setNodes $ nodes \\ [node]
killChilds
let Connection{closures=closures}= conn
liftIO $ modifyMVar_ closures $ const $ return M.empty)
mread conn
type IdClosure= Int
newtype Closure= Closure IdClosure deriving Show
execLog mlog = Transient $
case mlog of
SError e -> do
runTrans $ back e
return Nothing
SDone -> runTrans(back $ ErrorCall "SDone") >> return Nothing -- TODO remove closure?
SMore r -> process r False
SLast r -> process r True
where
process (closl,closr,log) deleteClosure= do
conn@Connection {closures=closures} <- getData `onNothing` error "Listen: myNode not set"
if closl== 0 then do
setData $ Log True log $ reverse log
setData $ Closure closr
return $ Just () -- !> "executing top level closure"
else do
-- return () !> "execlog"
mcont <- liftIO $ modifyMVar closures
$ \map -> return (if deleteClosure then
M.delete closl map
else map, M.lookup closl map)
-- !> ("closures=", M.size map)
case mcont of
Nothing -> do
runTrans $ msend conn $ SLast (closr,closl, [] :: [()] )
-- to delete the remote closure
error ("request received for non existent closure: "
++ show closl)
-- execute the closure
Just (fulLog,cont) -> liftIO $ runStateT (do
let nlog= reverse log ++ fulLog
setData $ Log True log nlog
setData $ Closure closr
-- !> ("SETCLOSURE",closr)
runCont cont) cont
-- !> ("executing closure",closl)
return Nothing
-- !> "FINISH CLOSURE"
#ifdef ghcjs_HOST_OS
listen node = onAll $ do
addNodes [node]
events <- liftIO $ newIORef M.empty
conn <- defConnection >>= \c -> return c{myNode=node,comEvent=events}
setData conn
r <- listenResponses
execLog r
#endif
type Pool= [Connection]
type Package= String
type Program= String
type Service= (Package, Program)
--------------------------------------------
data ParseContext a = IsString a => ParseContext (IO a) a deriving Typeable
#ifndef ghcjs_HOST_OS
parallelReadHandler :: Loggable a => TransIO (StreamData a)
parallelReadHandler= do
str <- giveData :: TransIO BS.ByteString
r <- choose $ readStream str
-- rest <- liftIO $ newIORef $ BS.unpack str
--
-- r <- parallel $ readStream' rest
return r
-- !> ("read",r)
-- !> "<-------<----------<--------<----------"
where
-- readStream' :: (Loggable a) => IORef String -> IO(StreamData a)
-- readStream' rest = do
-- return () !> "reAD StrEAM"
-- s <- readIORef rest
-- liftIO $ print $ takeWhile (/= ')') s
-- [(x,r)] <- maybeRead s
-- writeIORef rest r
-- return x
readStream :: (Typeable a, Read a) => BS.ByteString -> [StreamData a]
readStream s= readStream1 $ BS.unpack s
where
readStream1 s=
let [(x,r)] = reads s
in x : readStream1 r
-- maybeRead line= unsafePerformIO $ do
-- let [(v,left)] = reads line
---- print v
-- (v `seq` return [(v,left)])
-- `catch` (\(e::SomeException) -> do
-- liftIO $ print $ "******readStream ERROR in: "++take 100 line
-- maybeRead left)
readFrom Connection{connData= Just(TLSNode2Node ctx)}= recvTLSData ctx
readFrom Connection{connData= Just(Node2Node _ sock _)} = toStrict <$> loop
where
bufSize= 4098
loop :: IO BL.ByteString
loop = unsafeInterleaveIO $ do
s <- SBS.recv sock bufSize
if BC.length s < bufSize
then return $ BLC.Chunk s mempty
else BLC.Chunk s `liftM` loop
readFrom _ = error "readFrom error"
toStrict= B.concat . BS.toChunks
makeWSStreamFromConn conn= do
let rec= readFrom conn
send= sendRaw conn
makeStream -- !!> "WEBSOCKETS request"
(do
bs <- rec -- SBS.recv sock 4098
return $ if BC.null bs then Nothing else Just bs)
(\mbBl -> case mbBl of
Nothing -> return ()
Just bl -> send bl) -- SBS.sendMany sock (BL.toChunks bl) >> return()) -- !!> show ("SOCK RESP",bl)
makeWebsocketConnection conn uri headers= liftIO $ do
stream <- makeWSStreamFromConn conn
let
pc = WS.PendingConnection
{ WS.pendingOptions = WS.defaultConnectionOptions
, WS.pendingRequest = NWS.RequestHead uri headers False -- RequestHead (BC.pack $ show uri)
-- (map parseh headers) False
, WS.pendingOnAccept = \_ -> return ()
, WS.pendingStream = stream
}
sconn <- WS.acceptRequest pc -- !!> "accept request"
WS.forkPingThread sconn 30
return sconn
servePages (method,uri, headers) = do
-- return () !> ("HTTP request",method,uri, headers)
conn <- getSData <|> error " servePageMode: no connection"
if isWebSocketsReq headers
then return ()
else do
let file= if BC.null uri then "index.html" else uri
{- TODO renderin in server
NEEDED: recodify View to use blaze-html in server. wlink to get path in server
does file exist?
if exist, send else do
store path, execute continuation
get the rendering
send trough HTTP
- put this logic as independent alternative programmer options
serveFile dirs <|> serveApi apis <|> serveNode nodeCode
-}
mcontent <- liftIO $ (Just <$> BL.readFile ( "./static/out.jsexe/"++ BC.unpack file))
`catch` (\(e:: SomeException) -> return Nothing)
-- return "Not found file: index.html
please compile with ghcjs
ghcjs program.hs -o static/out")
case mcontent of
Just content -> liftIO $ sendRaw conn $
"HTTP/1.0 200 OK\nContent-Type: text/html\nConnection: close\nContent-Length: "
<> BS.pack (show $ BL.length content) <>"\n\n" <> content
-- (BL.toChunks content )
Nothing ->liftIO $ sendRaw conn $ BS.pack $ "HTTP/1.0 404 Not Found\nContent-Length: 0\nConnection: close\n\n"
empty
--counter= unsafePerformIO $ newMVar 0
api :: TransIO BS.ByteString -> Cloud ()
api w= Cloud $ do
conn <- getSData <|> error "api: Need a connection opened with initNode, listen, simpleWebApp"
let send= sendRaw conn
r <- w
liftIO $ myThreadId >>= print
send r -- !> r
isWebSocketsReq = not . null
. filter ( (== mk "Sec-WebSocket-Key") . fst)
data HTTPMethod= GET | POST deriving (Read,Show,Typeable)
receiveHTTPHead = do
(method, uri, vers) <- (,,) <$> getMethod <*> getUri <*> getVers
headers <- manyTill paramPair (string "\r\n\r\n") -- !> (method, uri, vers)
return (method, toStrict uri, headers) -- !> (method, uri, headers)
where
string :: BS.ByteString -> TransIO BS.ByteString
string s=withData $ \str -> do
let len= BS.length s
ret@(s',str') = BS.splitAt len str
if s == s'
then return ret
else empty
paramPair= (,) <$> (mk <$> getParam) <*> getParamValue
manyTill p end = scan
where
scan = do{ end; return [] }
<|>
do{ x <- p; xs <- scan; return (x:xs) }
getMethod= getString
getUri= getString
getVers= getString
getParam= do
dropSpaces
r <- tTakeWhile (\x -> x /= ':' && not (endline x))
if BS.null r || r=="\r" then empty else dropChar >> return (toStrict r)
getParamValue= toStrict <$> ( dropSpaces >> tTakeWhile (\x -> not (endline x)))
dropSpaces= parse $ \str ->((),BS.dropWhile isSpace str)
dropChar= parse $ \r -> ((), BS.tail r)
endline c= c== '\n' || c =='\r'
--tGetLine= tTakeWhile . not . endline
type PostParams = [(BS.ByteString, String)]
parsePostUrlEncoded :: TransIO PostParams
parsePostUrlEncoded= do
dropSpaces
many $ (,) <$> param <*> value
where
param= tTakeWhile' ( /= '=')
value= unEscapeString <$> BS.unpack <$> tTakeWhile' ( /= '&')
getString= do
dropSpaces
tTakeWhile (not . isSpace)
tTakeWhile :: (Char -> Bool) -> TransIO BS.ByteString
tTakeWhile cond= parse (BS.span cond)
tTakeWhile' :: (Char -> Bool) -> TransIO BS.ByteString
tTakeWhile' cond= parse ((\(h,t) -> (h, if BS.null t then t else BS.tail t)) . BS.span cond)
parse :: (BS.ByteString -> (b, BS.ByteString)) -> TransIO b
parse split= withData $ \str ->
if str== mempty then empty
else return $ split str
-- | bring the data of a parse context as a lazy byteString to a parser
-- and actualize the parse context with the result
withData :: (BS.ByteString -> TransIO (a,BS.ByteString)) -> TransIO a
withData parser= Transient $ do
ParseContext readMore s <- getData `onNothing` error "parser: no context"
let loop = unsafeInterleaveIO $ do
r <- readMore
(r <>) `liftM` loop
str <- liftIO $ (s <> ) `liftM` loop
mr <- runTrans $ parser str
case mr of
Nothing -> return Nothing
Just (v,str') -> do
setData $ ParseContext readMore str'
return $ Just v
-- | bring the data of the parse context as a lazy byteString
giveData =noTrans $ do
ParseContext readMore s <- getData `onNothing` error "parser: no context"
:: StateIO (ParseContext BS.ByteString) -- change to strict BS
let loop = unsafeInterleaveIO $ do
r <- readMore
(r <>) `liftM` loop
liftIO $ (s <> ) `liftM` loop
#endif
#ifdef ghcjs_HOST_OS
isBrowserInstance= True
api _= empty
#else
-- | True if it is running in the browser
isBrowserInstance= False
#endif
{-# NOINLINE emptyPool #-}
emptyPool :: MonadIO m => m (MVar Pool)
emptyPool= liftIO $ newMVar []
createNodeServ :: HostName -> Integer -> [Service] -> IO Node
createNodeServ h p svs= do
pool <- emptyPool
return $ Node h ( fromInteger p) pool svs
createNode :: HostName -> Integer -> IO Node
createNode h p= createNodeServ h p []
createWebNode :: IO Node
createWebNode= do
pool <- emptyPool
return $ Node "webnode" ( fromInteger 0) pool [("webnode","")]
instance Eq Node where
Node h p _ _ ==Node h' p' _ _= h==h' && p==p'
instance Show Node where
show (Node h p _ servs )= show (h,p, servs)
instance Read Node where
readsPrec _ s=
let r= readsPrec' 0 s
in case r of
[] -> []
[((h,p,ss),s')] -> [(Node h p empty
( ss),s')]
where
empty= unsafePerformIO emptyPool
nodeList :: TVar [Node]
nodeList = unsafePerformIO $ newTVarIO []
deriving instance Ord PortID
--myNode :: Int -> DBRef MyNode
--myNode= getDBRef $ key $ MyNode undefined
errorMyNode f= error $ f ++ ": Node not set. initialize it with connect, listen, initNode..."
getMyNode :: TransIO Node -- (MonadIO m, MonadState EventF m) => m Node
getMyNode = do
Connection{myNode= node} <- getSData <|> errorMyNode "getMyNode" :: TransIO Connection
return node
-- | return the list of nodes connected to the local node
getNodes :: MonadIO m => m [Node]
getNodes = liftIO $ atomically $ readTVar nodeList
-- | add nodes to the list of nodes
addNodes :: [Node] -> TransIO () -- (MonadIO m, MonadState EventF m) => [Node] -> m ()
addNodes nodes= do
my <- getMyNode -- mynode must be first
liftIO . atomically $ do
prevnodes <- readTVar nodeList
writeTVar nodeList $ my: (( nub $ nodes ++ prevnodes) \\[my])
-- | set the list of nodes
setNodes nodes= liftIO $ atomically $ writeTVar nodeList $ nodes
shuffleNodes :: MonadIO m => m [Node]
shuffleNodes= liftIO . atomically $ do
nodes <- readTVar nodeList
let nodes'= tail nodes ++ [head nodes]
writeTVar nodeList nodes'
return nodes'
--getInterfaces :: TransIO TransIO HostName
--getInterfaces= do
-- host <- logged $ do
-- ifs <- liftIO $ getNetworkInterfaces
-- liftIO $ mapM_ (\(i,n) ->putStrLn $ show i ++ "\t"++ show (ipv4 n) ++ "\t"++name n)$ zip [0..] ifs
-- liftIO $ putStrLn "Select one: "
-- ind <- input ( < length ifs)
-- return $ show . ipv4 $ ifs !! ind
-- #ifndef ghcjs_HOST_OS
--instance Read NS.SockAddr where
-- readsPrec _ ('[':s)=
-- let (s',r1)= span (/=']') s
-- [(port,r)]= readsPrec 0 $ tail $ tail r1
-- in [(NS.SockAddrInet6 port 0 (IP.toHostAddress6 $ read s') 0, r)]
-- readsPrec _ s=
-- let (s',r1)= span(/= ':') s
-- [(port,r)]= readsPrec 0 $ tail r1
-- in [(NS.SockAddrInet port (IP.toHostAddress $ read s'),r)]
-- #endif
--newtype MyNode= MyNode Node deriving(Read,Show,Typeable)
--instance Indexable MyNode where key (MyNode Node{nodePort=port}) = "MyNode "++ show port
--
--instance Serializable MyNode where
-- serialize= BS.pack . show
-- deserialize= read . BS.unpack
-- | set the rest of the computation as the code of a new node (first parameter) and connect it
-- to an existing node (second parameter). then it uses `connect`` to synchronize the list of nodes
connect :: Node -> Node -> Cloud ()
#ifndef ghcjs_HOST_OS
connect node remotenode = do
listen node <|> return ()
connect' remotenode
-- | synchronize the list of nodes with a remote node and all the nodes connected to it
-- the final effect is that all the nodes reachable share the same list of nodes
connect' remotenode= do
nodes <- local getNodes
localIO $ putStrLn $ "connecting to: "++ show remotenode
newNodes <- runAt remotenode $ do
local $ do
conn@Connection{} <- getSData <|>
error ("connect': need to be connected to a node: use wormhole/connect/listen")
let nodeConnecting= head nodes
liftIO $ modifyMVar_ (connection nodeConnecting) $ const $ return [conn]
onException $ \(e :: SomeException) -> do
liftIO $ putStrLn "removing node: ">> print nodeConnecting
nodes <- getNodes
setNodes $ nodes \\ [nodeConnecting]
-- return nodes -- delete
mclustered . local $ addNodes nodes
local $ do
allNodes <- getNodes
liftIO $ putStrLn "Known nodes: " >> print allNodes
return allNodes
local $ addNodes[remotenode]
callNodes' nodes (<>) mempty $ local $ addNodes newNodes -- add the new discovered nodes
local $ do
nodes <- getNodes
liftIO $ putStrLn "Known nodes: " >> print nodes
#else
connect _ _= empty
connect' _ = empty
#endif