make reorg handling backward looking if it has caught up with the chain

[iuwqyir]

TL;DR

Improved reorg handler block range calculation to support both forward and backward scanning based on the current sync state.

What changed?

• Added getReorgCheckRange function to dynamically determine the block range for reorg checks
• When catching up (large gap between latest checked and committed blocks), the handler scans forward
• When caught up (small gap), the handler looks backward from the latest committed block
• Added protection to prevent negative block numbers when scanning backward
• Added early exit when the latest checked block equals the target block

How to test?

• Run the new test cases:
  • TestReorgHandlerRangeIsForwardLookingWhenItIsCatchingUp
  • TestReorgHandlerRangeIsBackwardLookingWhenItIsCaughtUp
  • TestReorgHandlerRangeStartIs0WhenRangeIsLargerThanProcessedBlocks
• Verify the reorg handler correctly determines scan ranges in different sync states

Why make this change?

The previous implementation always scanned forward, which could miss reorgs when the system was caught up with the chain head. This change ensures more thorough reorg detection by adapting the scan direction based on the current sync state, improving the reliability of reorg detection.

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[iuwqyir]

• make reorg handling backward looking if it has caught up with the chain #143 👈 (View in Graphite)
• find all reorgs in current batch #142
• reorg handling: do not include non reorged blocks #141
• main

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[iuwqyir]

Merge activity

• Jan 30, 2:01 PM EST: A user started a stack merge that includes this pull request via Graphite.
• Jan 30, 2:04 PM EST: Graphite rebased this pull request as part of a merge.
• Jan 30, 2:06 PM EST: A user merged this pull request with Graphite.