From 013a56aa1af985894b3eaf7c325647b0b74e4456 Mon Sep 17 00:00:00 2001 From: Pieter Wuille Date: Wed, 19 Apr 2017 09:34:30 -0700 Subject: Non-atomic flushing using the blockchain as replay journal --- src/coins.h | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'src/coins.h') diff --git a/src/coins.h b/src/coins.h index 4774c9f6a6..de3264f46e 100644 --- a/src/coins.h +++ b/src/coins.h @@ -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 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 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); -- cgit v1.2.3