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coins: introduce CoinsViewOverlay

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Introduce `CoinsViewOverlay`, a `CCoinsViewCache` subclass that reads
coins without mutating the underlying cache via `FetchCoin()`.

Use `PeekCoin()` to look up a Coin through a stack of `CCoinsViewCache` layers without populating parent caches. This prevents the main cache from caching inputs pulled from disk for a block that has not yet been fully validated. Once `Flush()` is called on the view, these inputs will be added as spent to `coinsCache` in the main cache via `BatchWrite()`.

This is the foundation for async input fetching, where worker threads must not
mutate shared state.

Co-authored-by: l0rinc <pap.lorinc@gmail.com>
This commit is contained in:
Andrew Toth
2026-02-11 20:28:51 -05:00
parent 69b01af0eb
commit 67c0d1798e
5 changed files with 201 additions and 2 deletions
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7
src/coins.cpp
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@@ -60,10 +60,15 @@ size_t CCoinsViewCache::DynamicMemoryUsage() const {
return memusage::DynamicUsage(cacheCoins) + cachedCoinsUsage;
}
std::optional<Coin> CCoinsViewCache::FetchCoinFromBase(const COutPoint& outpoint) const
{
return base->GetCoin(outpoint);
}
CCoinsMap::iterator CCoinsViewCache::FetchCoin(const COutPoint &outpoint) const {
const auto [ret, inserted] = cacheCoins.try_emplace(outpoint);
if (inserted) {
if (auto coin{base->GetCoin(outpoint)}) {
if (auto coin{FetchCoinFromBase(outpoint)}) {
ret->second.coin = std::move(*coin);
cachedCoinsUsage += ret->second.coin.DynamicMemoryUsage();
Assert(!ret->second.coin.IsSpent());