1 files changed, 81 insertions, 0 deletions
diff --git a/hsm-core/Hsm/Core/Zmq/Server.hs b/hsm-core/Hsm/Core/Zmq/Server.hs
new file mode 100644
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--- /dev/null
+++ b/hsm-core/Hsm/Core/Zmq/Server.hs
@@ -0,0 +1,81 @@
+{-# LANGUAGE AllowAmbiguousTypes #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE OverloadedRecordDot #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TypeFamilies #-}
+
+module Hsm.Core.Zmq.Server
+  ( Server
+  , send
+  , runServer
+  ) where
+
+import Data.Binary (Binary)
+import Data.Text (Text, pack, unpack)
+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 (message)
+import Hsm.Core.Zmq (withSocket)
+import Streamly.Data.Fold qualified as S (drain)
+import Streamly.Data.Stream qualified as S (Stream, fold, mapM)
+import System.ZMQ4 qualified as Z
+
+data Server a b
+
+type instance DispatchOf Server = Static E.WithSideEffects
+
+newtype instance E.StaticRep Server =
+  Server (Z.Socket Z.Pub)
+
+domain :: Text
+domain = "server"
+
+send ::
+     forall env es a.
+     ( HasField "name" env Text
+     , Log :> es
+     , Reader env :> es
+     , Server :> es
+     , Binary a
+     , Show a
+     )
+  => S.Stream (Eff es) a
+  -> Eff es ()
+send = S.fold S.drain . S.mapM sender
+  where
+    sender :: a -> Eff es ()
+    sender payload = do
+      Server sock <- E.getStaticRep
+      env <- ask @env
+      E.unsafeEff_ $ Z.send sock [] $ message env.name payload
+      localDomain domain $ logTrace_ $ "Message sent: " <> pack (show payload)
+
+runServer ::
+     forall env es a.
+     ( HasField "pubEp" env Text
+     , IOE :> es
+     , Log :> es
+     , Reader env :> es
+     , Resource :> es
+     )
+  => Eff (Server : es) a
+  -> Eff es a
+runServer action = withSocket Z.Pub >>= run
+  where
+    run :: Z.Socket Z.Pub -> Eff es a
+    run sock = E.evalStaticRep (Server sock) $ initialize >> action
+      where
+        bind :: Text -> Eff (Server : es) ()
+        bind = E.unsafeEff_ . Z.bind sock . unpack
+        --
+        initialize :: Eff (Server : es) ()
+        initialize =
+          localDomain domain $ do
+            logInfo_ "Initializing ZMQ server"
+            env <- ask @env
+            bind env.pubEp
+            logTrace_ $ "Publishing to " <> env.pubEp