core: batch sending messages (#3566)

* core: batch sending messages

* batch without iorefs (#3573)

* one-pass

* simplexmq

* simplexmq

* simplexmq

* simplexmq

* revert change to ios project file

* refactor

* simplify

---------

Co-authored-by: Alexander Bondarenko <486682+dpwiz@users.noreply.github.com>

src/Simplex/Chat/Controller.hs

@@ -84,6 +84,7 @@ import Simplex.RemoteControl.Invitation (RCSignedInvitation, RCVerifiedInvitatio
 import Simplex.RemoteControl.Types
 import System.IO (Handle)
 import System.Mem.Weak (Weak)
+import qualified UnliftIO.Exception as E
 import UnliftIO.STM
 
 versionNumber :: String
@@ -1287,12 +1288,26 @@ withStoreCtx ctx_ action = do
     handleInternal :: String -> SomeException -> IO (Either StoreError a)
     handleInternal ctxStr e = pure . Left . SEInternalError $ show e <> ctxStr
 
+withStoreBatch :: (ChatMonad' m, Traversable t) => (DB.Connection -> t (IO (Either ChatError a))) -> m (t (Either ChatError a))
+withStoreBatch actions = do
+  ChatController {chatStore} <- ask
+  liftIO $ withTransaction chatStore $ mapM (`E.catch` handleInternal) . actions
+  where
+    handleInternal :: E.SomeException -> IO (Either ChatError a)
+    handleInternal = pure . Left . ChatError . CEInternalError . show
+
+withStoreBatch' :: (ChatMonad' m, Traversable t) => (DB.Connection -> t (IO a)) -> m (t (Either ChatError a))
+withStoreBatch' actions = withStoreBatch $ fmap (fmap Right) . actions
+
 withAgent :: ChatMonad m => (AgentClient -> ExceptT AgentErrorType m a) -> m a
 withAgent action =
   asks smpAgent
     >>= runExceptT . action
     >>= liftEither . first (`ChatErrorAgent` Nothing)
 
+withAgent' :: ChatMonad' m => (AgentClient -> m a) -> m a
+withAgent' action = asks smpAgent >>= action
+
 $(JQ.deriveJSON (enumJSON $ dropPrefix "HS") ''HelpSection)
 
 $(JQ.deriveJSON (sumTypeJSON $ dropPrefix "CLQ") ''ChatListQuery)