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CHIA-1808 Speedup requesting removals by using a cache #18895

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CHIA-1808 Speedup requesting removals by using a cache #18895

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10 changes: 9 additions & 1 deletion chia/full_node/coin_store.py
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Original file line number Diff line number Diff line change
Expand Up @@ -33,12 +33,13 @@ class CoinStore:

db_wrapper: DBWrapper2
coins_added_at_height_cache: LRUCache[uint32, list[CoinRecord]]
coins_removed_at_height_cache: LRUCache[uint32, list[CoinRecord]]

@classmethod
async def create(cls, db_wrapper: DBWrapper2) -> CoinStore:
if db_wrapper.db_version != 2:
raise RuntimeError(f"CoinStore does not support database schema v{db_wrapper.db_version}")
self = CoinStore(db_wrapper, LRUCache(100))
self = CoinStore(db_wrapper, LRUCache(100), LRUCache(100))

async with self.db_wrapper.writer_maybe_transaction() as conn:
log.info("DB: Creating coin store tables and indexes.")
Expand Down Expand Up @@ -199,6 +200,11 @@ async def get_coins_removed_at_height(self, height: uint32) -> list[CoinRecord]:
# Special case to avoid querying all unspent coins (spent_index=0)
if height == 0:
return []

removed_coins_records = self.coins_removed_at_height_cache.get(height)
if removed_coins_records is not None:
return removed_coins_records

async with self.db_wrapper.reader_no_transaction() as conn:
async with conn.execute(
"SELECT confirmed_index, spent_index, coinbase, puzzle_hash, "
Expand All @@ -211,6 +217,7 @@ async def get_coins_removed_at_height(self, height: uint32) -> list[CoinRecord]:
coin = self.row_to_coin(row)
coin_record = CoinRecord(coin, row[0], row[1], row[2], row[6])
coins.append(coin_record)
self.coins_removed_at_height_cache.put(height, coins)
return coins

async def get_all_coins(self, include_spent_coins: bool) -> list[CoinRecord]:
Expand Down Expand Up @@ -567,6 +574,7 @@ async def rollback_to_block(self, block_index: int) -> list[CoinRecord]:

await conn.execute("UPDATE coin_record SET spent_index=0 WHERE spent_index>?", (block_index,))
self.coins_added_at_height_cache = LRUCache(self.coins_added_at_height_cache.capacity)
self.coins_removed_at_height_cache = LRUCache(self.coins_removed_at_height_cache.capacity)
return list(coin_changes.values())

# Store CoinRecord in DB
Expand Down
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