feat: implement bal cache as a part of BlockChainProvider#22952
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Soubhik-10 wants to merge 43 commits into
Closed
feat: implement bal cache as a part of BlockChainProvider#22952Soubhik-10 wants to merge 43 commits into
Soubhik-10 wants to merge 43 commits into
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Introduces an in-memory LRU cache for Block Access Lists (BALs) in the Engine API. BALs are cached when payloads are validated as VALID via newPayload. - Add BalCache with internal Arc for cheap cloning - Store BALs keyed by block hash with block number index for range queries - Implement engine_getBALsByHashV1 and engine_getBALsByRangeV1 - Add metrics for cache inserts/hits/misses Per EIP-7928, the EL should retain BALs for the weak subjectivity period (~3533 epochs). This initial implementation uses a configurable LRU cache (default 1024 entries) as a starting point.
- Collapse nested if statements using let-chains - Add backticks around BTreeMap in doc comment
Ensures caller knows returned BALs correspond to contiguous blocks [start, start + len)
Extract num_hash and BAL before calling new_payload to avoid cloning the entire ExecutionData payload.
Replace LRU-based cache with simpler design: - Use HashMap<BlockHash, Bytes> for O(1) hash lookups - Use BTreeMap<BlockNumber, BlockHash> as source of truth for eviction - Evict oldest (lowest) block numbers when at capacity - Handle reorgs by removing old hash when block number is replaced This is simpler, more predictable, and removes schnellru dependency.
# Conflicts: # crates/rpc/rpc-engine-api/src/engine_api.rs
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