rescan: use batch filter fetching #275
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Roasbeef
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May 23, 2023
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@Roasbeef: review reminder |
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Introduce a new `rescanState` struct which holds the variables required for a rescan. We then also conver the existing `rescan` function into a method of `rescanState`. This refactor will assist in making future clean up of the `rescan` method easier.
Add a new `waitForBlocks` helper method to rescanState that will wait on block notifications until a given predicate returns true. Currently this method is only called with one predicate but an upcoming commit will make use of it using a differnet predicate.
This is required for the follow up commit where access to the IsCurrent method is required in the rescanState.rescan method which only has access to the ChainSource interface.
Let the rescan function wait until the filter headers have either caught up to the back end chain or until they have caught up to the specified rescan end block. This lets the rescan operation take advantage of doing batch filter fetching during rescan making the operation a lot faster since filters can be fetched in batches of 1000 instead of one at a time.
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| @@ -446,6 +446,36 @@ func (rs *rescanState) rescan() error { | |||
| return err | |||
| } | |||
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| // To ensure that we batch as many filter queries as possible, we also | |||
| // wait for the header chain to either be current or for it to at least | |||
| // have caught up with the specified end block. | |||
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cc @ProofOfKeags for review request |
positiveblue
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Jul 27, 2023
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post merge ACK b38fa7f It took me a sec to realize most of the diff was just nesting some values under the state structure. Seems like the only major change was blocking on waiting for the header chain to get far enough ahead to maximize the benefits of batching. |
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With this PR, we ensure that
rescancan make use of batch filter fetching bywaiting until the header chain is either current or until it is ahead of the specified
end height before starting the scan. This greatly improves the speed of a rescan
because before this commit, the filters would be fetched one-by-one.
The first few commits of this PR are just refactor commits that clean-up the
rescanfunction and then the actual behaviour change is added in the final commit.
Fixes #68
Replaces #236
Performance Improvement
On current master branch, syncing 3200 filters on my local regtest network takes 4m25s
With this PR, syncing the same number of filters takes 653ms
LND CI
lightningnetwork/lnd#7788