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Refactor and fix usage of get_session_index() and get_session_info_by_index() #4735

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paritytech-processbot merged 14 commits into from
Jan 26, 2022
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Refactor and fix usage of get_session_index() and get_session_info_by_index() #4735

paritytech-processbot merged 14 commits into from
Jan 26, 2022

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@sandreim sandreim commented Jan 18, 2022 •
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Fixes #4733

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@github-actions github-actions bot added the A3-in_progress Pull request is in progress. No review needed at this stage. label Jan 18, 2022
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Signed-off-by: Andrei Sandu <[email protected]>
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fix comments
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Signed-off-by: Andrei Sandu <[email protected]>
@sandreim sandreim added 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. labels Jan 18, 2022
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renaming and more comments
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Signed-off-by: Andrei Sandu <[email protected]>
drahnr
drahnr reviewed Jan 19, 2022
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A few nits, one item that requires explaining, other than that LGTM

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Signed-off-by: Andrei Sandu <[email protected]>
@sandreim sandreim marked this pull request as ready for review January 19, 2022 17:02
@github-actions github-actions bot added A0-please_review Pull request needs code review. and removed A3-in_progress Pull request is in progress. No review needed at this stage. labels Jan 19, 2022
@sandreim sandreim requested a review from eskimor January 19, 2022 17:20
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Looks good so far.

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eskimor commented Jan 20, 2022

Here we are not actually using the SessionInfo for the leaf, but the SessionInfo for the leaf's child. Therefore, at session boundaries we will look up the backing group in the wrong session. 😬

So the comment is correct, but it does not matter as we don't lookup the leaf's session, but its child session. I am not 100% sure how to fix this properly. We could use the relay_parent as it is stored in the occupied core data, but this could break if relay_parent got already finalized and the state trie got cleared, then the SessionIndex lookup would fail for that reason.

What should work more reliably even with @slumber 's and asynchronous backing would be to just lookup the session for the leaf for real. An API in RuntimeInfo for fetching the block's session, instead of its child would make sense. The implementation could just use the chain api for looking up the parent and then fetch the session index for it's child. The chances of the direct parent of an active leaf to be already finalized should be negligible.

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ordian commented Jan 20, 2022

but this could break if relay_parent got already finalized and the state trie got cleared, then the SessionIndex lookup would fail for that reason.

since we cache session info per index, this shouldn't happen in practice

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eskimor commented Jan 20, 2022

since we cache session info per index, this shouldn't happen in practice

but the index lookup might fail.

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ordian commented Jan 20, 2022

since we cache session info per index, this shouldn't happen in practice

but the index lookup might fail.

right, but it's also cached per relay_parent

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I haven't checked all the places where we fetch session index, but the ones modified in this PR look good.

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sandreim commented Jan 26, 2022

bot merge

@paritytech-processbot paritytech-processbot bot merged commit f06e87e into master Jan 26, 2022
@paritytech-processbot paritytech-processbot bot deleted the sandreim/session_index branch January 26, 2022 15:17
@slumber slumber mentioned this pull request Jan 27, 2022
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ordian pushed a commit that referenced this pull request Jan 27, 2022
Merge branch 'master' into refactor_check_validation_outputs
675dde3 
* master:
  Fix incomplete sorting. (#4795)
  Companion for better way to resolve `Phase::Emergency` via governance #10663 (#4757)
  Refactor and fix usage of `get_session_index()` and `get_session_info_by_index()` (#4735)
  `relay chain selection` and `dispute-coordinator` fixes and improvements (#4752)
  Fix tests (#4787)
  log concluded disputes (#4785)
  availability-distribution: look for leaf ancestors within the same session (#4596)
  Companion for Use proper bounded vector type for nominations #10601 (#4709)
  Fix release profile (#4778)
  [ci] remove publish-s3-release (#4779)
  Companion for substrate#10632 (#4689)
  [ci] pipeline chores (#4775)
  New changelog scripts (#4491)
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Check usage of get_session_index() and request_session_index_for_child()

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