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refactor: wrap CCoinsViewCursor in unique_ptr

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Specifically with CCoinsViewDB, if a raw cursor is allocated and
not freed, a cryptic leveldb assertion failure occurs on
CCoinsViewDB destruction.

See: https://github.com/google/leveldb/issues/142#issuecomment-414418135
This commit is contained in:
James O'Beirne
2021-06-16 16:27:20 -04:00
parent 6bc1eca01b
commit 615c1adfb0
6 changed files with 15 additions and 14 deletions
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4
src/coins.cpp
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@@ -13,7 +13,7 @@ bool CCoinsView::GetCoin(const COutPoint &outpoint, Coin &coin) const { return f
uint256 CCoinsView::GetBestBlock() const { return uint256(); }
std::vector<uint256> CCoinsView::GetHeadBlocks() const { return std::vector<uint256>(); }
bool CCoinsView::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) { return false; }
CCoinsViewCursor *CCoinsView::Cursor() const { return nullptr; }
std::unique_ptr<CCoinsViewCursor> CCoinsView::Cursor() const { return nullptr; }
bool CCoinsView::HaveCoin(const COutPoint &outpoint) const
{
@@ -28,7 +28,7 @@ uint256 CCoinsViewBacked::GetBestBlock() const { return base->GetBestBlock(); }
std::vector<uint256> CCoinsViewBacked::GetHeadBlocks() const { return base->GetHeadBlocks(); }
void CCoinsViewBacked::SetBackend(CCoinsView &viewIn) { base = &viewIn; }
bool CCoinsViewBacked::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) { return base->BatchWrite(mapCoins, hashBlock); }
CCoinsViewCursor *CCoinsViewBacked::Cursor() const { return base->Cursor(); }
std::unique_ptr<CCoinsViewCursor> CCoinsViewBacked::Cursor() const { return base->Cursor(); }
size_t CCoinsViewBacked::EstimateSize() const { return base->EstimateSize(); }
CCoinsViewCache::CCoinsViewCache(CCoinsView *baseIn) : CCoinsViewBacked(baseIn), cachedCoinsUsage(0) {}