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Non-atomic flushing using the blockchain as replay journal

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This commit is contained in:
Pieter Wuille
2017-04-19 09:34:30 -07:00
parent b3a279cd58
commit 013a56aa1a
7 changed files with 186 additions and 16 deletions
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13
src/coins.h
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@@ -155,6 +155,12 @@ public:
//! Retrieve the block hash whose state this CCoinsView currently represents
virtual uint256 GetBestBlock() const;
//! Retrieve the range of blocks that may have been only partially written.
//! If the database is in a consistent state, the result is the empty vector.
//! Otherwise, a two-element vector is returned consisting of the new and
//! the old block hash, in that order.
virtual std::vector<uint256> GetHeadBlocks() const;
//! Do a bulk modification (multiple Coin changes + BestBlock change).
//! The passed mapCoins can be modified.
virtual bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock);
@@ -181,6 +187,7 @@ public:
bool GetCoin(const COutPoint &outpoint, Coin &coin) const override;
bool HaveCoin(const COutPoint &outpoint) const override;
uint256 GetBestBlock() const override;
std::vector<uint256> GetHeadBlocks() const override;
void SetBackend(CCoinsView &viewIn);
bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) override;
CCoinsViewCursor *Cursor() const override;
@@ -289,10 +296,12 @@ private:
};
//! Utility function to add all of a transaction's outputs to a cache.
// It assumes that overwrites are only possible for coinbase transactions,
// When check is false, this assumes that overwrites are only possible for coinbase transactions.
// When check is true, the underlying view may be queried to determine whether an addition is
// an overwrite.
// TODO: pass in a boolean to limit these possible overwrites to known
// (pre-BIP34) cases.
void AddCoins(CCoinsViewCache& cache, const CTransaction& tx, int nHeight);
void AddCoins(CCoinsViewCache& cache, const CTransaction& tx, int nHeight, bool check = false);
//! Utility function to find any unspent output with a given txid.
const Coin& AccessByTxid(const CCoinsViewCache& cache, const uint256& txid);