Use the IO instance of MonadRandom #1677
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mrBliss
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ouroboros-consensus/ouroboros-consensus-mock/src/Ouroboros/Consensus/Mock/Protocol/Praos.hs
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This was referenced Feb 20, 2020
edsko
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ouroboros-consensus/ouroboros-consensus-mock/src/Ouroboros/Consensus/Mock/Protocol/Praos.hs
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Previously, block production had to live in STM, but this is no longer the case as of #1445. This means that we no longer need to run `MonadRandom` computations in STM. To do that, we stored a DRG in a TVar. Now, we can simply use IO's instance of `MonadRandom`. In the tests we still use the DRG-in-a-TVar trick, but we split it whenever we get a DRG. We use the `RunMonadRandom` record for this purpose. In addition, this removes all notion of state from `ConsensusProtocol`, and instead makes this part of the `RunNode` interface. This also fixes and re-enables the praos tests. Closes #1616 Closes #1678 Closes #1545 Co-authored-by: Thomas Winant <thomas@well-typed.com>
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Fixes #1616.
Previously, block production had to live in STM, but this is no longer the
case as of #1445. This means that we no longer need to run
MonadRandomcomputations in STM. To do that, we stored a DRG in a TVar.
Now, we can simply use IO's instance of
MonadRandom. In the tests we stilluse the DRG-in-a-TVar trick, but we split it whenever we get a DRG.
We use the
RunMonadRandomrecord for this purpose.Replace NodeState with MonadState
Previously, we need a separate
HasNodeStateclass andNodeStateTmonadtransformer because there was already a
StateTin our stack, i.e., the onecontaining the DRG. As that is gone, we can switch back to a regular
MonadState+StateT.The cost is an orphan instance:
MonadRandom (StateT s m)