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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 (forM_)
import Control.Monad.Loops (whileM)
import Data.ByteString (ByteString)
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 (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 :: (Log :> es, Client :> es) => Eff es ByteString
receiver = do
Client sock <- E.getStaticRep
message <- E.unsafeEff_ $ Z.receive sock
localDomain domain
$ logTrace_
$ "Message received with topic: " <> topic message
return message
receive :: (Log :> es, Client :> es) => Stream (Eff es) ByteString
receive = repeatM receiver
poll :: (Log :> es, Client :> es) => Stream (Eff es) [ByteString]
poll =
repeatM $ do
ms <- whileM newMsg receiver
localDomain domain
$ localDomain "poller"
$ logTrace_
$ pack (show $ length ms) <> " new message(s) on queue"
return ms
where
newMsg = do
Client sock <- E.getStaticRep
peek <- E.unsafeEff_ $ Z.poll 0 [Z.Sock sock [Z.In] Nothing]
return $ peek /= [[]]
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 >>= \sock ->
E.evalStaticRep (Client sock) $ do
localDomain domain $ do
logInfo_ "Initializing ZMQ client"
env <- ask @env
forM_ env.subEps $ E.unsafeEff_ . Z.connect sock . unpack
forM_ env.topics $ E.unsafeEff_ . Z.subscribe sock . encodeUtf8
logTrace_ $ "Listening to " <> pack (show env.subEps)
logTrace_ $ "Subscribed to " <> pack (show env.topics)
action
|
