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2021-08-11 14:03:12 <merijn> That means wrapping with extra STM to check if it's closed, though
2021-08-11 14:03:25 <merijn> timCF: hm
2021-08-11 14:03:35 <merijn> timCF: You just have N workers and wanna know if they're all dead, yeah?
2021-08-11 14:03:46 <merijn> timCF: Don't you just want QSemN?
2021-08-11 14:06:45 <timCF> merijn: No, I have an gRPC subscription procedure which should return something from a server stream in case of success. So I'm providing to stream handler link to MVar to fill in. And then spawning subscription processes, trying to read this MVar in main process and hope for the best
2021-08-11 14:07:38 <timCF> In case this "stream callback MVar" was not filled in 10 attempts - all procedure fails.
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2021-08-11 14:09:51 <kuribas> Is there a validation transformer?
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2021-08-11 14:10:39 <timCF> Spawned gRPC procedure might die before calling stream callback, which results in no active MVar references, but it should be fine because I'm using `tryPutMVar` and `tryTakeMVar` to avoid deadlock detection of Haskell runtime.
2021-08-11 14:10:56 <justsomeguy> When installing stack manually, using the staic binary, as listed here https://docs.haskellstack.org/en/stable/install_and_upgrade/#manual-download_2, how do I check the gpg signature of the tar file? I don't see a signed checksum file anywhere. ...
2021-08-11 14:12:29 <kuribas> hmm, I can just Compose Validation I guess...
2021-08-11 14:13:53 <merijn> kuribas: Yeah, Applicatives don't need transformers due to Compose
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2021-08-11 14:18:23 <int-e> timCF: how do you know which MVar is causing this?
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2021-08-11 14:20:07 <kuribas> ugh, validation depends on lens, and brings in the kitchen sink...
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2021-08-11 14:21:07 <timCF> int-e: yes, this one https://github.com/coingaming/lnd-client/blob/1a45d5fa731f39f73243a8a624d583a5858729b3/src/LndClient/RPC/Silent.hs#L128
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2021-08-11 14:26:58 <nf> int-e: thanks for the release!
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2021-08-11 14:29:28 <int-e> nf: thanks for the prod!
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2021-08-11 14:31:34 <int-e> timCF: that didn't answer my question, fwiw
2021-08-11 14:32:13 <int-e> Then again I'm not sure I can help anyway. AFAIUI, try{Put,Take}MVar *can't* cause this exceptions because they can never block at all.
2021-08-11 14:33:14 <int-e> Which strongly suggests that the actual MVar that's causing this is somewhere else, maybe in a dependency.
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2021-08-11 14:35:46 <timCF> int-e: Hmm. Thanks for reply anyway! Maybe implementation of these functions was different before. I'm using not the latest version of Base, from lts-14.27
2021-08-11 14:36:30 <int-e> these have been dedicated primops for a very long time
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2021-08-11 14:43:21 <int-e> Since early 2001, when tryPutMVar was added in the first place (tryTakeMVar already existed at that point)
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2021-08-11 15:24:23 <amesgen[m]> kuribas: there is monad-validate: https://hackage.haskell.org/package/monad-validate-1.2.0.0/docs/Control-Monad-Validate.html
2021-08-11 15:24:23 <amesgen[m]> It has a slightly unlawful Monad instance, which is documented in great detail
2021-08-11 15:24:53 <kuribas> amesgen[m]: I wrote my own ValidateT, which is only an Applicative.
2021-08-11 15:25:29 <kuribas> then I use "fromExceptT :: Functor m => ExceptT e m a -> ValidationT e m a"
2021-08-11 15:25:42 <kuribas> So I can easily write functionality using mtl...
2021-08-11 15:26:33 <amesgen[m]> yeah, monad-validate is an alternative where you don't have to convert from ExceptT all the time, at the cost that it is not a completely valid monad
2021-08-11 15:26:59 <amesgen[m]> from the haddocks: "To put it another way, ValidateT provides “best effort” error reporting: it will never return fewer errors than an equivalent use of ExceptT, but it might return more."
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