[input-output-hk/cardano-sl] [CBR-243] improve wallet worker start-up and exception handling (#3330)

k0001 commented on this pull request.

> +— ‘STM’ function, in FIFO order.
+— After the given continuation returns (successfully or due to some exception),
+— the worker will continue processing any pending input before returning,
+— re-throwing the continuation’s exception if any.
+— Usage of the obtained ‘STM’ action after the given continuation has returned
+— will fail with an exception.
+ :: (MonadIO m, Ex.MonadMask m)
+ => WalletActionInterp IO a
+ -> ((WalletAction a -> STM ()) -> m b)
+ -> m b
+withWalletWorker wai k = do
+ — ‘mDone’ is full if the worker finished.
+ mDone :: MVar (Either Ex.SomeException ()) <- liftIO newEmptyMVar It turns out things are better with `async`. I just submitted those changes. Thanks for the suggestion.

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