PaperBroker: more robust QTIS requests

src/Broker/PaperBroker.hs

@@ -21,7 +21,7 @@ import Data.Time.Clock
 import Data.Maybe
 import Control.Monad
 import Control.Concurrent.BoundedChan
-import Control.Concurrent hiding (readChan)
+import Control.Concurrent hiding (readChan, writeChan)
 import System.Log.Logger
 import ATrade.Quotes.QTIS
 import System.ZMQ4
@@ -36,6 +36,7 @@ data QTISResult = Fetching | Done TickerInfo
 
 data PaperBrokerState = PaperBrokerState {
   pbTid :: Maybe ThreadId,
+  qtisTid :: Maybe ThreadId,
   tickMap :: M.Map TickMapKey Tick,
   tickerInfoMap :: M.Map TickerId QTISResult,
   orders :: M.Map OrderId Order,
@@ -61,6 +62,7 @@ mkPaperBroker :: Context -> T.Text -> BoundedChan Tick -> Price -> [T.Text] -> I
 mkPaperBroker ctx qtisEp tickChan startCash accounts = do
   state <- newIORef PaperBrokerState {
     pbTid = Nothing,
+    qtisTid = Nothing,
     tickMap = M.empty,
     tickerInfoMap = M.empty,
     orders = M.empty,
@@ -77,9 +79,14 @@ mkPaperBroker ctx qtisEp tickChan startCash accounts = do
     postMarketCloseTime = hourMin 15 50
     }
 
-  tid <- forkIO $ brokerThread ctx qtisEp tickChan state
+  qtisRequestChan <- newBoundedChan 10000
+
+  tid <- forkIO $ brokerThread qtisRequestChan tickChan state
   atomicModifyIORef' state (\s -> (s { pbTid = Just tid }, ()))
 
+  qtid <- forkIO $ qtisThread state qtisRequestChan ctx qtisEp
+  atomicModifyIORef' state (\s -> (s { qtisTid = Just qtid }, ()))
+
   return BrokerInterface {
     accounts = accounts,
     setNotificationCallback = pbSetNotificationCallback state,
@@ -87,16 +94,39 @@ mkPaperBroker ctx qtisEp tickChan startCash accounts = do
     cancelOrder = pbCancelOrder state,
     stopBroker = pbDestroyBroker state }
     
-brokerThread :: Context -> T.Text -> BoundedChan Tick -> IORef PaperBrokerState -> IO ()
-brokerThread ctx qtisEp chan state = forever $ do
+qtisThread :: IORef PaperBrokerState -> BoundedChan TickerId -> Context -> T.Text -> IO ()
+qtisThread state qtisRequestChan ctx qtisEndpoint =
+  forever $ do
+    threadDelay 1000000
+    tickerIds <- readListFromChan qtisRequestChan
+    ti <- qtisGetTickersInfo ctx qtisEndpoint tickerIds
+    forM_ ti (\newInfo -> atomicModifyIORef' state (\s -> (s { tickerInfoMap = M.insert (tiTicker newInfo) (Done newInfo) $! tickerInfoMap s }, ())))
+  where
+    readListFromChan chan = do
+      mh <- tryReadChan chan
+      case mh of
+        Just h -> do
+          t <- readListFromChan' [h] chan
+          return $ reverse t
+        _ -> do
+          h <- readChan chan
+          t <- readListFromChan' [h] chan
+          return $ reverse t
+
+    readListFromChan' h chan = do
+      mv <- tryReadChan chan
+      case mv of
+        Nothing -> return h
+        Just v -> readListFromChan' (v:h) chan
+          
+brokerThread :: BoundedChan TickerId -> BoundedChan Tick -> IORef PaperBrokerState -> IO ()
+brokerThread qtisRequestChan chan state = forever $ do
     tick <- readChan chan
     when (datatype tick == LastTradePrice) $ do
       info <- M.lookup (security tick) . tickerInfoMap <$> readIORef state
       when (isNothing info) $ do
         atomicModifyIORef' state (\s -> (s { tickerInfoMap = M.insert (security tick) Fetching $! tickerInfoMap s }, ()))
-        void $ forkIO $ do
-          ti <- qtisGetTickersInfo ctx qtisEp [security tick]
-          forM_ ti (\newInfo -> atomicModifyIORef' state (\s -> (s { tickerInfoMap = M.insert (security tick) (Done newInfo) $! tickerInfoMap s }, ())))
+        writeChan qtisRequestChan (security tick)
 
     atomicModifyIORef' state (\s -> (s { tickMap = M.insert (makeKey tick) tick $! tickMap s }, ()))
     executePendingOrders tick state