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bitcoinjs / indexd

An external bitcoind index management service module
ISC License
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How does indexd handle block reorgs? #48

Closed christroutner closed 2 years ago

christroutner commented 2 years ago

Is there any code or documentation around block reorgs and how indexd handles them? I'm referring to the types of block reorgs illustrated in this technical explanation.

I'm just starting to look through the code and get the indexer running. If there are specific places in the code that handle re-orgs, please drop some links.

junderw commented 2 years ago

Every time you call tryResync it runs the internal __resync which will delete any non-active tips from all indexes recursively, one block at a time.

While it's doing that recursion, this.syncing is true.

So as long as you don't rely on the data while this.syncing is true, you will be fine (you won't catch it in the middle of reorg deletion and insertion.

https://github.com/bitcoinjs/indexd/blob/b9e503daf8edc3e0f4d01dd307665c48fcabb744/index.js#L195-L203