basic events work

hbs2-core/lib/HBS2/Actors/Peer.hs

@@ -1,5 +1,6 @@
 {-# Language TemplateHaskell #-}
 {-# Language UndecidableInstances #-}
+{-# Language AllowAmbiguousTypes #-}
 module HBS2.Actors.Peer where
 
 import HBS2.Prelude.Plated
@@ -10,7 +11,9 @@ import HBS2.Net.Proto
 import HBS2.Net.Messaging
 import HBS2.Net.Proto.Sessions
 import HBS2.Defaults
+import HBS2.Events
 
+import Control.Monad.Trans.Maybe
 import Codec.Serialise hiding (encode,decode)
 import Control.Concurrent.Async
 import Control.Monad.Reader
@@ -84,6 +87,7 @@ data PeerEnv e =
   , _envStorage     :: AnyStorage
   , _envDeferred    :: Pipeline IO ()
   , _envSessions    :: Cache SKey Dynamic
+  , _envEvents      :: Cache SKey Dynamic
   }
 
 newtype PeerM e m a = PeerM { fromPeerM :: ReaderT (PeerEnv e) m a }
@@ -183,11 +187,45 @@ instance ( MonadIO m
     let bs = serialise (AnyMessage @e proto (encode msg))
     sendTo pipe (To p) (From me) bs
 
+
+
+instance ( HasProtocol e p
+         , Typeable (EventHandler e p (PeerM e IO))
+         , Typeable (EventKey e p)
+         , Typeable (Event e p)
+         , Hashable (EventKey e p)
+         , Eq (EventKey e p)
+         ) => EventListener e p (PeerM e IO) where
+
+  subscribe k h = do
+    ev <- asks (view envEvents)
+    liftIO $ Cache.insert ev (newSKey @(EventKey e p) k) (toDyn h)
+    pure ()
+
+instance ( HasProtocol e p
+         , Typeable (EventKey e p)
+         , Typeable (Event e p)
+         , Hashable (EventKey e p)
+         , Eq (EventKey e p)
+         , Typeable (EventHandler e p (PeerM e IO))
+         ) => EventEmitter e p (PeerM e IO) where
+
+  emit k d = do
+    se <- asks (view envEvents)
+    let sk = newSKey @(EventKey e p) k
+
+    void $ runMaybeT $ do
+      r  <- MaybeT $ liftIO $ Cache.lookup se sk
+      ev <- MaybeT $ pure $ fromDynamic @(EventHandler e p (PeerM e IO)) r
+      lift $ ev d
+
+
 runPeerM :: MonadIO m => AnyStorage -> Fabriq e -> Peer e  -> PeerM e m a -> m ()
 runPeerM s bus p f  = do
 
   env <- PeerEnv p bus s <$> newPipeline defProtoPipelineSize
                          <*> liftIO (Cache.newCache (Just defCookieTimeout))
+                         <*> liftIO (Cache.newCache (Just defCookieTimeout))
 
   let de = view envDeferred env
   as <- liftIO $ async $ runPipeline de
@@ -211,8 +249,6 @@ runProto hh = do
   me       <- ownPeer @e @m
   pipe     <- getFabriq
 
-  -- defer <- newPipeline @(ResponseM e m ()) @m defProtoPipelineSize
-
   let resp = [ (pid, a) | a@AnyProtocol { myProtoId = pid } <- hh ]
 
   let disp = Map.fromList resp
@@ -278,3 +314,14 @@ instance ( MonadIO m
 
   expire k = lift (expire  k)
 
+
+instance ( MonadIO m
+         , Hashable (EventKey e p)
+         , EventEmitter e p m
+         ) => EventEmitter e p (ResponseM e  m) where
+
+  emit k d = lift $ emit k d
+
+
+
+

hbs2-core/lib/HBS2/Events.hs

@@ -3,7 +3,6 @@ module HBS2.Events where
 
 import Data.Kind
 
-
 -- General Events class.
 --
 -- It's may be way too general.
@@ -28,11 +27,16 @@ import Data.Kind
 -- I suspect that 'e' has a global meaning and
 -- represent an 'interpreter'.
 
-class Monad m => HasEvents e a m | a -> e where
-
 data family EventKey e a :: Type
-  type family Event e a    :: Type
+data family Event e a    :: Type
+
+type EventHandler e a m = Event e a -> m ()
+
+class Monad m => EventListener e a m | a -> e where
+  subscribe  :: EventKey e a -> EventHandler e a m -> m ()
+
+class Monad m => EventEmitter e a m | a -> e where
+  emit  :: EventKey e a -> Event e a ->  m ()
 
-  subscribe  :: EventKey e a -> Event e a -> m ()
 
 

hbs2-core/lib/HBS2/Net/Proto/BlockInfo.hs

@@ -3,6 +3,7 @@ module HBS2.Net.Proto.BlockInfo where
 import HBS2.Prelude.Plated
 import HBS2.Net.Proto
 import HBS2.Net.Proto.Sessions
+import HBS2.Events
 import HBS2.Hash
 
 import Codec.Serialise ()
@@ -47,3 +48,13 @@ newtype instance SessionKey e (BlockSize e) =
   deriving stock (Typeable,Eq,Show)
   deriving newtype (Hashable,IsString)
 
+
+newtype instance EventKey e (BlockSize e) =
+  BlockSizeEventKey ()
+  deriving stock (Typeable, Eq)
+  deriving newtype (Hashable)
+
+data instance Event e (BlockSize e) =
+  BlockSizeEvent
+  deriving stock (Typeable)
+

hbs2-tests/test/Peer2Main.hs

@@ -131,6 +131,7 @@ handleBlockInfo :: forall e m . ( MonadIO m
                                 , Default (SessionData e (BlockSize e))
                                 , Ord (Peer e)
                                 , Pretty (Peer e)
+                                , EventEmitter e (BlockSize e) m
                                 )
 
                 => (Peer e, Hash HbSync, Maybe Integer)
@@ -141,28 +142,20 @@ handleBlockInfo (p, h, sz') = do
     let bsz = fromIntegral sz
     update @e def (BlockSizeKey h) (over bsBlockSizes (Map.insert p bsz))
     liftIO $ debug $ "got block:" <+> pretty (p, h, sz)
+    emit @e (BlockSizeEventKey ()) BlockSizeEvent
     -- FIXME: turn back on event notification
     -- lift $ runEngineM env $ emitBlockSizeEvent ev h (p, h, Just sz) -- TODO: fix this crazy shit
 
 
-instance HasEvents Fake (BlockSize Fake) (PeerM Fake IO) where
-  data instance EventKey Fake (BlockSize Fake) = BlockSizeEvent ()
-  type instance Event Fake (BlockSize Fake) = ()
-
-  subscribe = undefined
-
 blockDownloadLoop :: forall e . ( HasProtocol e (BlockSize e)
                                 , Request e (BlockSize e) (PeerM e IO)
-                                , HasEvents e (BlockSize e) (PeerM e IO)
+                                , EventListener e (BlockSize e) (PeerM e IO)
                                 , Num (Peer e)
                                 ) =>  PeerM e IO ()
 blockDownloadLoop = do
 
-  -- w <- subscribe ???
-  --
-
-  -- subscribe @(GetBlockSize e) $ \(p,h,i) -> do
-  --   debug "WE GOT BLOCK!"
+  w <- subscribe @e @(BlockSize e) (BlockSizeEventKey ()) $ \_ -> do
+        debug "can't believe this shit works"
 
   request 1 (GetBlockSize @e "5KP4vM6RuEX6RA1ywthBMqZV5UJDLANC17UrF6zuWdRt")
   request 1 (GetBlockSize @e "81JeD7LNR6Q7RYfyWBxfjJn1RsWzvegkUXae6FUNgrMZ")