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{-# LANGUAGE AllowAmbiguousTypes #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE OverloadedRecordDot #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeFamilies #-}
module Hsm.Core.Zmq.Client
( Client
, receive
, poll
, runClient
) where
import Control.Monad.Loops (whileM)
import Data.Binary (Binary)
import Data.Text (Text, pack, unpack)
import Data.Text.Encoding (encodeUtf8)
import Effectful (Dispatch(Static), DispatchOf, Eff, IOE, (:>))
import Effectful.Dispatch.Static qualified as E
import Effectful.Log (Log, localDomain, logInfo_, logTrace_)
import Effectful.Reader.Static (Reader, ask)
import Effectful.Resource (Resource)
import GHC.Records (HasField)
import Hsm.Core.Message (body, topic)
import Hsm.Core.Zmq (withSocket)
import Streamly.Data.Stream (Stream, repeatM)
import System.ZMQ4 qualified as Z
data Client a b
type instance DispatchOf Client = Static E.WithSideEffects
newtype instance E.StaticRep Client =
Client (Z.Socket Z.Sub)
domain :: Text
domain = "client"
receiver ::
forall es a. (Log :> es, Client :> es, Binary a, Show a)
=> Eff es a
receiver = do
Client sock <- E.getStaticRep
message <- E.unsafeEff_ $ Z.receive sock
localDomain domain
$ logTrace_
$ "Message received ["
<> topic message
<> "]: "
<> pack (show $ body @a message)
return $ body message
receive ::
forall es a. (Log :> es, Client :> es, Binary a, Show a)
=> Stream (Eff es) a
receive = repeatM receiver
poll ::
forall es a. (Log :> es, Client :> es, Binary a, Show a)
=> Stream (Eff es) [a]
poll = repeatM poller
where
newMsg :: Eff es Bool
newMsg = do
Client sock <- E.getStaticRep
peek <- E.unsafeEff_ $ Z.poll 0 [Z.Sock sock [Z.In] Nothing]
return $ peek /= [[]]
--
poller :: Eff es [a]
poller = do
ms <- whileM newMsg receiver
localDomain domain
$ localDomain "poller"
$ logTrace_
$ pack (show $ length ms) <> " new message(s) on queue"
return ms
runClient ::
forall env es a.
( HasField "subEps" env [Text]
, HasField "topics" env [Text]
, IOE :> es
, Log :> es
, Reader env :> es
, Resource :> es
)
=> Eff (Client : es) a
-> Eff es a
runClient action = withSocket Z.Sub >>= run
where
run :: Z.Socket Z.Sub -> Eff es a
run sock = E.evalStaticRep (Client sock) $ initialize >> action
where
connect :: Text -> Eff (Client : es) ()
connect = E.unsafeEff_ . Z.connect sock . unpack
--
subscribe :: Text -> Eff (Client : es) ()
subscribe = E.unsafeEff_ . Z.subscribe sock . encodeUtf8
--
initialize :: Eff (Client : es) ()
initialize =
localDomain domain $ do
logInfo_ "Initializing ZMQ client"
env <- ask @env
mapM_ connect env.subEps
mapM_ subscribe env.topics
logTrace_ $ "Listening to " <> pack (show env.subEps)
logTrace_ $ "Subscribed to " <> pack (show env.topics)
|
