From d59901591644413e8ff298c83242bd7d8b15d3e9 Mon Sep 17 00:00:00 2001
From: Sam Truzjan <pxqr.sta@gmail.com>
Date: Wed, 25 Dec 2013 01:44:41 +0400
Subject: Kill listener thread at exit

---
 src/Network/KRPC/Manager.hs | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

(limited to 'src/Network')

diff --git a/src/Network/KRPC/Manager.hs b/src/Network/KRPC/Manager.hs
index 9d8688d3..a8c90b33 100644
--- a/src/Network/KRPC/Manager.hs
+++ b/src/Network/KRPC/Manager.hs
@@ -55,6 +55,7 @@ type Handler     h = (MethodName, HandlerBody h)
 data Manager h = Manager
   { sock               :: !Socket
   , queryTimeout       :: !Int -- ^ in seconds
+  , listenerThread     :: !(MVar ThreadId)
   , transactionCounter :: {-# UNPACK #-} !TransactionCounter
   , pendingCalls       :: {-# UNPACK #-} !PendingCalls
   , handlers           :: [Handler h]
@@ -68,6 +69,9 @@ class (MonadBaseControl IO m, MonadIO m) => MonadKRPC h m | m -> h where
 
   liftHandler :: h a -> m a
 
+  default liftHandler :: m a -> m a
+  liftHandler = id
+
 instance (MonadBaseControl IO h, MonadIO h)
       => MonadKRPC h (ReaderT (Manager h) h) where
   liftHandler = lift
@@ -86,9 +90,10 @@ defaultQueryTimeout = 120
 newManager :: SockAddr -> [Handler h] -> IO (Manager h)
 newManager servAddr handlers = do
     sock  <- bindServ
+    tref  <- newEmptyMVar
     tran  <- newIORef seedTransaction
     calls <- newIORef M.empty
-    return $ Manager sock defaultQueryTimeout tran calls handlers
+    return $ Manager sock defaultQueryTimeout tref tran calls handlers
   where
     bindServ = do
       let family = sockAddrFamily servAddr
@@ -101,9 +106,11 @@ newManager servAddr handlers = do
 -- | Unblock all pending calls and close socket.
 closeManager :: Manager m -> IO ()
 closeManager Manager {..} = do
+  maybe (return ()) killThread =<< tryTakeMVar listenerThread
   -- TODO unblock calls
   close sock
 
+-- | Normally you should use Control.Monad.Trans.allocate function.
 withManager :: SockAddr -> [Handler h] -> (Manager h -> IO a) -> IO a
 withManager addr hs = bracket (newManager addr hs) closeManager
 
@@ -236,5 +243,10 @@ listener = do
       Left  e -> liftIO $ sendMessage sock addr  $ unknownMessage e
       Right m -> handleMessage m addr
 
-listen :: MonadKRPC h m => m ThreadId
-listen = fork $ listener
+-- | Should be run before any 'query', otherwise they will never
+-- succeed.
+listen :: MonadKRPC h m => m ()
+listen = do
+  Manager {..} <- getManager
+  tid <- fork $ listener
+  liftIO $ putMVar listenerThread tid
-- 
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