Re: [Haskell-beginners] how does hgearman-client work?

16 Mar 2017

      I'm really much obliged for your support, David.
...
This library seems badly managed, but it does give you just enough to
work with, if you know how to use monad transformers.
It seems so. I tried to get some help by author at first: https://github.com/jperson/hgearman-client/issues/1

That's a reason why I'm working on PR to add some tests to the package.

Cheers,
Alexei
...
On 16 March 2017 at 13:25 David McBride  wrote:
This library seems badly managed, but it does give you just enough to
work with, if you know how to use monad transformers.
someprocedure :: IO Bool
someprocedure = do
  res <- connectGearman somebs somehost someport
  case res of
    Left e -> undefined
    Right client -> do
      (res, _) <- flip runStateT client $ do
        res <- submitJob somefunc somebs
        case res of
          Left e -> undefined
          Right bs -> do
            -- do something with bs
            return True
      return res
If I were you I'd turn LambdaCase on to clean it up a bit, and do
something like this.
{-# LANGUAGE LambdaCase #-}
...
someprocedure :: IO Bool
someprocedure = do
  connectGearman somebs somehost someport >>= \case
    Left e -> return False
    Right client -> do
      flip evalStateT client $ do
        submitJob somefunc somebs >>= \case
          Left e -> return False
          Right bs -> do
            -- do something with bs
            return True
On Wed, Mar 15, 2017 at 4:18 PM,   wrote:
...
Hi,
I repeat my unanswered question in hope to find here some help:
Unfortunately the package hgearman does not provide any test or example and
I can't work it out for myself how should be combined connectGearman and
submitJob to put a job to the gearman job server.
The result of connectGearman is:
ghci> conn <- connectGearman (B.pack "x") ("localhost"::HostName)
(4730::Port)
ghci> :t conn
conn :: Either GearmanError GearmanClient
but submitJob uses private function submit which deals with StateT. So I can
only guess the result of connectGearman should be wrapped into S.StateT
GearmanClient IO without faintest idea how to do that.
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Re: [Haskell-beginners] how does hgearman-client work?

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