feat(sync): add unwinding support for chain reorganizations #323
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Implement functionality to handle chain reorganizations by unwinding blocks in the sync pipeline. When the pipeline receives a new tip that is smaller than its current tip, it can now revert the chain state back to a specific block number. The Stage trait has been extended with a new unwind method that accepts a target block number and removes all blocks after it, ensuring the database state reflects only the data up to the unwind point. Each stage implements unwinding differently based on its responsibilities. The Blocks stage removes block headers, hashes, transactions, and receipts from their respective tables. The Classes stage removes class declarations and artifacts for blocks after the unwind target. The StateTrie stage unwinding is left unimplemented as it requires more complex trie unwinding logic that maintains merkle tree invariants. All stages update their checkpoints after unwinding to maintain consistency. The implementation uses the existing database transaction abstraction to ensure atomicity of the unwind operations. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
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superseded by #337 |
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Implements unwinding support for the sync pipeline to handle chain reorganizations. When the pipeline detects that a new chain tip is smaller than the current tip, it needs to revert the blockchain state back to a specific block number. This is a critical feature for maintaining consensus in distributed systems where temporary forks can occur.
The implementation extends the Stage trait with an unwind method that each stage must implement according to its specific data storage patterns. The Blocks stage handles removal of block metadata, headers, and all associated transactions from the database. The Classes stage manages the cleanup of contract class declarations and their compiled artifacts. The StateTrie stage unwinding is intentionally left unimplemented with clear documentation noting that it requires complex merkle trie unwinding logic to maintain tree invariants, which is beyond the current scope.
Each unwinding operation is performed within a database transaction to ensure atomicity, and stage checkpoints are updated afterward to maintain consistency across the pipeline. This ensures that if the node crashes during unwinding, the database remains in a valid state.