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Accept PVF code hashes in validation host #3655

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@slumber slumber commented Aug 17, 2021 •
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Resolves paritytech/polkadot-sdk#973

  • Update Implementer's guide

@slumber slumber requested a review from pepyakin August 17, 2021 20:51
@pepyakin pepyakin added A0-please_review Pull request needs code review. B0-silent Changes should not be mentioned in any release notes C1-low PR touches the given topic and has a low impact on builders. D3-trivial 🧸 PR contains trivial changes in a runtime directory that do not require an audit. labels Aug 18, 2021
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My main concern is the candidate-validation changes. I think the code can be improved there by leveraging the fact that the candidate descriptor carries the code hash which we can query.

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@pepyakin pepyakin self-requested a review August 19, 2021 13:05
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candidate-validation looks way better now! However, there is another point which made me sad: "Code not found" thingy.

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@pepyakin pepyakin self-requested a review August 23, 2021 14:56
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@pepyakin pepyakin added A1-onice and removed A0-please_review Pull request needs code review. labels Aug 27, 2021
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On ice until #3728 is landed.

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drive-by comment

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@mrcnski
Merge branch 'master' into slumber-use-cached-pvf
3668cfa
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Fix leftover errors from merge
32680ca 
Putting these changes in their own commit, to make it clear that there were
extra changes on top of the merge.
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slumber commented Oct 11, 2022

@pepyakin note that given async backing changes (in particular #5557) ValidateFromChainState is not used anymore, backing requires explicitly providing persisted validation data (which makes sense).

IMO this PR should be closed as it introduces rather unnecessary changes for now. The caching can be implemented later but would require some additional work.

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mrcnski commented Oct 11, 2022

I guess I should have asked around more before tackling this!

If this PR is closed then should this issue be closed as well? I believe it depends on this PR.

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slumber commented Oct 11, 2022

I guess I should have asked around more before tackling this!

If this PR is closed then should this issue be closed as well? I believe it depends on this PR.

No worries, there was no decision on closing it (yet), that's just my comment to give more context on whether this issue is still relevant. I started a discussion on how to proceed with it.
Another obvious option would be to rebase it straight to the async backing feature branch.

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@pepyakin note that given async backing changes (in particular #5557) ValidateFromChainState is not used anymore, backing requires explicitly providing persisted validation data (which makes sense).

Explicitly providing PVD? But this one is about passing PVF hashes instead of providing the preimages, right?

But yeah in general I am not surprised of this outcome, candidate-validation was asking for rework anyway.

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slumber commented Oct 12, 2022

Explicitly providing PVD? But this one is about passing PVF hashes instead of providing the preimages, right?

Yes, for this reason a PR is still relevant but requires additional work.

For example, ValidateFrom... message types could be unified into one and we would always attempt to look up pvf in the cache first.

@the-right-joyce the-right-joyce added S5-on_ice Work is currently on hold, see comments for further information. and removed A1-onice labels Dec 14, 2022
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PVF validation host: pull not push PVFs
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