- where
- awaitSomethingToWrite :: IO ()
- awaitSomethingToWrite
- = {-# SCC "awaitSomethingToWrite" #-}
- do action
- <- atomically $!
- -- キューが空でなくなるまで待つ
- do queue <- readTVar tQueue
- -- GettingBody 状態にあり、Continue が期待され
- -- てゐて、それがまだ送信前なのであれば、
- -- Continue を送信する。
- case S.viewr queue of
- EmptyR -> retry
- _ :> itr -> do state <- readItr itr itrState id
-
- if state == GettingBody then
- writeContinueIfNecessary itr
- else
- if state >= DecidingBody then
- writeHeaderOrBodyIfNecessary itr
- else
- retry
- action
-
- writeContinueIfNecessary :: Interaction -> STM (IO ())
- writeContinueIfNecessary itr
- = {-# SCC "writeContinueIfNecessary" #-}
- itr `seq`
- do expectedContinue <- readItr itr itrExpectedContinue id
- if expectedContinue then
- do wroteContinue <- readItr itr itrWroteContinue id
- if wroteContinue then
- -- 既に Continue を書込み濟
- retry
- else
- do reqBodyWanted <- readItr itr itrReqBodyWanted id
- if reqBodyWanted /= Nothing then
- return $ writeContinue itr
- else
- retry
- else
- retry