722 lines
29 KiB
C++
722 lines
29 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_TXMEMPOOL_H
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#define BITCOIN_TXMEMPOOL_H
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#include <memory>
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#include <set>
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#include <map>
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#include <vector>
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#include <utility>
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#include <string>
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#include "amount.h"
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#include "coins.h"
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#include "indirectmap.h"
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#include "primitives/transaction.h"
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#include "sync.h"
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#include "random.h"
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#undef foreach
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#include "boost/multi_index_container.hpp"
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#include "boost/multi_index/ordered_index.hpp"
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#include "boost/multi_index/hashed_index.hpp"
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class CAutoFile;
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class CBlockIndex;
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inline double AllowFreeThreshold()
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{
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return COIN * 144 / 250;
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}
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inline bool AllowFree(double dPriority)
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{
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// Large (in bytes) low-priority (new, small-coin) transactions
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// need a fee.
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return dPriority > AllowFreeThreshold();
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}
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/** Fake height value used in CCoins to signify they are only in the memory pool (since 0.8) */
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static const unsigned int MEMPOOL_HEIGHT = 0x7FFFFFFF;
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struct LockPoints
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{
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// Will be set to the blockchain height and median time past
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// values that would be necessary to satisfy all relative locktime
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// constraints (BIP68) of this tx given our view of block chain history
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int height;
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int64_t time;
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// As long as the current chain descends from the highest height block
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// containing one of the inputs used in the calculation, then the cached
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// values are still valid even after a reorg.
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CBlockIndex* maxInputBlock;
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LockPoints() : height(0), time(0), maxInputBlock(NULL) { }
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};
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class CTxMemPool;
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/** \class CTxMemPoolEntry
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*
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* CTxMemPoolEntry stores data about the correponding transaction, as well
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* as data about all in-mempool transactions that depend on the transaction
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* ("descendant" transactions).
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*
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* When a new entry is added to the mempool, we update the descendant state
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* (nCountWithDescendants, nSizeWithDescendants, and nModFeesWithDescendants) for
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* all ancestors of the newly added transaction.
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*
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* If updating the descendant state is skipped, we can mark the entry as
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* "dirty", and set nSizeWithDescendants/nModFeesWithDescendants to equal nTxSize/
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* nFee+feeDelta. (This can potentially happen during a reorg, where we limit the
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* amount of work we're willing to do to avoid consuming too much CPU.)
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*
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*/
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class CTxMemPoolEntry
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{
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private:
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std::shared_ptr<const CTransaction> tx;
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CAmount nFee; //!< Cached to avoid expensive parent-transaction lookups
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size_t nTxWeight; //!< ... and avoid recomputing tx weight (also used for GetTxSize())
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size_t nModSize; //!< ... and modified size for priority
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size_t nUsageSize; //!< ... and total memory usage
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int64_t nTime; //!< Local time when entering the mempool
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double entryPriority; //!< Priority when entering the mempool
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unsigned int entryHeight; //!< Chain height when entering the mempool
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bool hadNoDependencies; //!< Not dependent on any other txs when it entered the mempool
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CAmount inChainInputValue; //!< Sum of all txin values that are already in blockchain
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bool spendsCoinbase; //!< keep track of transactions that spend a coinbase
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int64_t sigOpCost; //!< Total sigop cost
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int64_t feeDelta; //!< Used for determining the priority of the transaction for mining in a block
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LockPoints lockPoints; //!< Track the height and time at which tx was final
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// Information about descendants of this transaction that are in the
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// mempool; if we remove this transaction we must remove all of these
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// descendants as well. if nCountWithDescendants is 0, treat this entry as
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// dirty, and nSizeWithDescendants and nModFeesWithDescendants will not be
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// correct.
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uint64_t nCountWithDescendants; //!< number of descendant transactions
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uint64_t nSizeWithDescendants; //!< ... and size
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CAmount nModFeesWithDescendants; //!< ... and total fees (all including us)
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// Analogous statistics for ancestor transactions
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uint64_t nCountWithAncestors;
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uint64_t nSizeWithAncestors;
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CAmount nModFeesWithAncestors;
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int64_t nSigOpCostWithAncestors;
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public:
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CTxMemPoolEntry(const CTransaction& _tx, const CAmount& _nFee,
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int64_t _nTime, double _entryPriority, unsigned int _entryHeight,
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bool poolHasNoInputsOf, CAmount _inChainInputValue, bool spendsCoinbase,
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int64_t nSigOpsCost, LockPoints lp);
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CTxMemPoolEntry(const CTxMemPoolEntry& other);
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const CTransaction& GetTx() const { return *this->tx; }
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std::shared_ptr<const CTransaction> GetSharedTx() const { return this->tx; }
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/**
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* Fast calculation of lower bound of current priority as update
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* from entry priority. Only inputs that were originally in-chain will age.
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*/
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double GetPriority(unsigned int currentHeight) const;
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const CAmount& GetFee() const { return nFee; }
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size_t GetTxSize() const;
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size_t GetTxWeight() const { return nTxWeight; }
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int64_t GetTime() const { return nTime; }
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unsigned int GetHeight() const { return entryHeight; }
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bool WasClearAtEntry() const { return hadNoDependencies; }
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int64_t GetSigOpCost() const { return sigOpCost; }
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int64_t GetModifiedFee() const { return nFee + feeDelta; }
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size_t DynamicMemoryUsage() const { return nUsageSize; }
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const LockPoints& GetLockPoints() const { return lockPoints; }
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// Adjusts the descendant state, if this entry is not dirty.
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void UpdateDescendantState(int64_t modifySize, CAmount modifyFee, int64_t modifyCount);
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// Adjusts the ancestor state
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void UpdateAncestorState(int64_t modifySize, CAmount modifyFee, int64_t modifyCount, int modifySigOps);
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// Updates the fee delta used for mining priority score, and the
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// modified fees with descendants.
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void UpdateFeeDelta(int64_t feeDelta);
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// Update the LockPoints after a reorg
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void UpdateLockPoints(const LockPoints& lp);
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uint64_t GetCountWithDescendants() const { return nCountWithDescendants; }
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uint64_t GetSizeWithDescendants() const { return nSizeWithDescendants; }
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CAmount GetModFeesWithDescendants() const { return nModFeesWithDescendants; }
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bool GetSpendsCoinbase() const { return spendsCoinbase; }
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uint64_t GetCountWithAncestors() const { return nCountWithAncestors; }
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uint64_t GetSizeWithAncestors() const { return nSizeWithAncestors; }
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CAmount GetModFeesWithAncestors() const { return nModFeesWithAncestors; }
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int64_t GetSigOpCostWithAncestors() const { return nSigOpCostWithAncestors; }
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mutable size_t vTxHashesIdx; //!< Index in mempool's vTxHashes
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};
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// Helpers for modifying CTxMemPool::mapTx, which is a boost multi_index.
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struct update_descendant_state
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{
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update_descendant_state(int64_t _modifySize, CAmount _modifyFee, int64_t _modifyCount) :
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modifySize(_modifySize), modifyFee(_modifyFee), modifyCount(_modifyCount)
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{}
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void operator() (CTxMemPoolEntry &e)
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{ e.UpdateDescendantState(modifySize, modifyFee, modifyCount); }
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private:
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int64_t modifySize;
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CAmount modifyFee;
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int64_t modifyCount;
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};
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struct update_ancestor_state
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{
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update_ancestor_state(int64_t _modifySize, CAmount _modifyFee, int64_t _modifyCount, int64_t _modifySigOpsCost) :
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modifySize(_modifySize), modifyFee(_modifyFee), modifyCount(_modifyCount), modifySigOpsCost(_modifySigOpsCost)
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{}
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void operator() (CTxMemPoolEntry &e)
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{ e.UpdateAncestorState(modifySize, modifyFee, modifyCount, modifySigOpsCost); }
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private:
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int64_t modifySize;
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CAmount modifyFee;
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int64_t modifyCount;
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int64_t modifySigOpsCost;
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};
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struct update_fee_delta
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{
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update_fee_delta(int64_t _feeDelta) : feeDelta(_feeDelta) { }
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void operator() (CTxMemPoolEntry &e) { e.UpdateFeeDelta(feeDelta); }
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private:
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int64_t feeDelta;
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};
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struct update_lock_points
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{
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update_lock_points(const LockPoints& _lp) : lp(_lp) { }
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void operator() (CTxMemPoolEntry &e) { e.UpdateLockPoints(lp); }
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private:
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const LockPoints& lp;
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};
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// extracts a TxMemPoolEntry's transaction hash
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struct mempoolentry_txid
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{
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typedef uint256 result_type;
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result_type operator() (const CTxMemPoolEntry &entry) const
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{
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return entry.GetTx().GetHash();
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}
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};
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/** \class CompareTxMemPoolEntryByDescendantScore
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*
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* Sort an entry by max(score/size of entry's tx, score/size with all descendants).
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*/
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class CompareTxMemPoolEntryByDescendantScore
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{
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public:
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bool operator()(const CTxMemPoolEntry& a, const CTxMemPoolEntry& b)
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{
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bool fUseADescendants = UseDescendantScore(a);
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bool fUseBDescendants = UseDescendantScore(b);
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double aModFee = fUseADescendants ? a.GetModFeesWithDescendants() : a.GetModifiedFee();
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double aSize = fUseADescendants ? a.GetSizeWithDescendants() : a.GetTxSize();
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double bModFee = fUseBDescendants ? b.GetModFeesWithDescendants() : b.GetModifiedFee();
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double bSize = fUseBDescendants ? b.GetSizeWithDescendants() : b.GetTxSize();
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// Avoid division by rewriting (a/b > c/d) as (a*d > c*b).
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double f1 = aModFee * bSize;
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double f2 = aSize * bModFee;
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if (f1 == f2) {
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return a.GetTime() >= b.GetTime();
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}
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return f1 < f2;
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}
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// Calculate which score to use for an entry (avoiding division).
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bool UseDescendantScore(const CTxMemPoolEntry &a)
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{
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double f1 = (double)a.GetModifiedFee() * a.GetSizeWithDescendants();
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double f2 = (double)a.GetModFeesWithDescendants() * a.GetTxSize();
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return f2 > f1;
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}
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};
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/** \class CompareTxMemPoolEntryByScore
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*
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* Sort by score of entry ((fee+delta)/size) in descending order
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*/
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class CompareTxMemPoolEntryByScore
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{
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public:
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bool operator()(const CTxMemPoolEntry& a, const CTxMemPoolEntry& b)
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{
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double f1 = (double)a.GetModifiedFee() * b.GetTxSize();
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double f2 = (double)b.GetModifiedFee() * a.GetTxSize();
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if (f1 == f2) {
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return b.GetTx().GetHash() < a.GetTx().GetHash();
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}
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return f1 > f2;
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}
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};
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class CompareTxMemPoolEntryByEntryTime
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{
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public:
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bool operator()(const CTxMemPoolEntry& a, const CTxMemPoolEntry& b)
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{
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return a.GetTime() < b.GetTime();
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}
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};
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class CompareTxMemPoolEntryByAncestorFee
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{
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public:
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bool operator()(const CTxMemPoolEntry& a, const CTxMemPoolEntry& b)
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{
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double aFees = a.GetModFeesWithAncestors();
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double aSize = a.GetSizeWithAncestors();
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double bFees = b.GetModFeesWithAncestors();
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double bSize = b.GetSizeWithAncestors();
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// Avoid division by rewriting (a/b > c/d) as (a*d > c*b).
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double f1 = aFees * bSize;
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double f2 = aSize * bFees;
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if (f1 == f2) {
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return a.GetTx().GetHash() < b.GetTx().GetHash();
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}
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return f1 > f2;
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}
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};
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// Multi_index tag names
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struct descendant_score {};
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struct entry_time {};
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struct mining_score {};
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struct ancestor_score {};
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class CBlockPolicyEstimator;
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/**
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* Information about a mempool transaction.
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*/
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struct TxMempoolInfo
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{
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/** The transaction itself */
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std::shared_ptr<const CTransaction> tx;
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/** Time the transaction entered the mempool. */
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int64_t nTime;
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/** Feerate of the transaction. */
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CFeeRate feeRate;
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/** The fee delta. */
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int64_t nFeeDelta;
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};
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/**
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* CTxMemPool stores valid-according-to-the-current-best-chain transactions
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* that may be included in the next block.
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*
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* Transactions are added when they are seen on the network (or created by the
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* local node), but not all transactions seen are added to the pool. For
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* example, the following new transactions will not be added to the mempool:
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* - a transaction which doesn't make the mimimum fee requirements.
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* - a new transaction that double-spends an input of a transaction already in
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* the pool where the new transaction does not meet the Replace-By-Fee
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* requirements as defined in BIP 125.
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* - a non-standard transaction.
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*
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* CTxMemPool::mapTx, and CTxMemPoolEntry bookkeeping:
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*
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* mapTx is a boost::multi_index that sorts the mempool on 4 criteria:
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* - transaction hash
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* - feerate [we use max(feerate of tx, feerate of tx with all descendants)]
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* - time in mempool
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* - mining score (feerate modified by any fee deltas from PrioritiseTransaction)
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*
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* Note: the term "descendant" refers to in-mempool transactions that depend on
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* this one, while "ancestor" refers to in-mempool transactions that a given
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* transaction depends on.
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*
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* In order for the feerate sort to remain correct, we must update transactions
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* in the mempool when new descendants arrive. To facilitate this, we track
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* the set of in-mempool direct parents and direct children in mapLinks. Within
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* each CTxMemPoolEntry, we track the size and fees of all descendants.
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*
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* Usually when a new transaction is added to the mempool, it has no in-mempool
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* children (because any such children would be an orphan). So in
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* addUnchecked(), we:
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* - update a new entry's setMemPoolParents to include all in-mempool parents
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* - update the new entry's direct parents to include the new tx as a child
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* - update all ancestors of the transaction to include the new tx's size/fee
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*
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* When a transaction is removed from the mempool, we must:
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* - update all in-mempool parents to not track the tx in setMemPoolChildren
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* - update all ancestors to not include the tx's size/fees in descendant state
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* - update all in-mempool children to not include it as a parent
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*
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* These happen in UpdateForRemoveFromMempool(). (Note that when removing a
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* transaction along with its descendants, we must calculate that set of
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* transactions to be removed before doing the removal, or else the mempool can
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* be in an inconsistent state where it's impossible to walk the ancestors of
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* a transaction.)
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*
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* In the event of a reorg, the assumption that a newly added tx has no
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* in-mempool children is false. In particular, the mempool is in an
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* inconsistent state while new transactions are being added, because there may
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* be descendant transactions of a tx coming from a disconnected block that are
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* unreachable from just looking at transactions in the mempool (the linking
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* transactions may also be in the disconnected block, waiting to be added).
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* Because of this, there's not much benefit in trying to search for in-mempool
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* children in addUnchecked(). Instead, in the special case of transactions
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* being added from a disconnected block, we require the caller to clean up the
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* state, to account for in-mempool, out-of-block descendants for all the
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* in-block transactions by calling UpdateTransactionsFromBlock(). Note that
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* until this is called, the mempool state is not consistent, and in particular
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* mapLinks may not be correct (and therefore functions like
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* CalculateMemPoolAncestors() and CalculateDescendants() that rely
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* on them to walk the mempool are not generally safe to use).
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*
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* Computational limits:
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*
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* Updating all in-mempool ancestors of a newly added transaction can be slow,
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* if no bound exists on how many in-mempool ancestors there may be.
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* CalculateMemPoolAncestors() takes configurable limits that are designed to
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* prevent these calculations from being too CPU intensive.
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*
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* Adding transactions from a disconnected block can be very time consuming,
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* because we don't have a way to limit the number of in-mempool descendants.
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* To bound CPU processing, we limit the amount of work we're willing to do
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* to properly update the descendant information for a tx being added from
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* a disconnected block. If we would exceed the limit, then we instead mark
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* the entry as "dirty", and set the feerate for sorting purposes to be equal
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* the feerate of the transaction without any descendants.
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*
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*/
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class CTxMemPool
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{
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private:
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uint32_t nCheckFrequency; //!< Value n means that n times in 2^32 we check.
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unsigned int nTransactionsUpdated;
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CBlockPolicyEstimator* minerPolicyEstimator;
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uint64_t totalTxSize; //!< sum of all mempool tx' byte sizes
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uint64_t cachedInnerUsage; //!< sum of dynamic memory usage of all the map elements (NOT the maps themselves)
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CFeeRate minReasonableRelayFee;
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mutable int64_t lastRollingFeeUpdate;
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mutable bool blockSinceLastRollingFeeBump;
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mutable double rollingMinimumFeeRate; //!< minimum fee to get into the pool, decreases exponentially
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void trackPackageRemoved(const CFeeRate& rate);
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public:
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static const int ROLLING_FEE_HALFLIFE = 60 * 60 * 12; // public only for testing
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typedef boost::multi_index_container<
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CTxMemPoolEntry,
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boost::multi_index::indexed_by<
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// sorted by txid
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boost::multi_index::hashed_unique<mempoolentry_txid, SaltedTxidHasher>,
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// sorted by fee rate
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boost::multi_index::ordered_non_unique<
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boost::multi_index::tag<descendant_score>,
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boost::multi_index::identity<CTxMemPoolEntry>,
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CompareTxMemPoolEntryByDescendantScore
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>,
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// sorted by entry time
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boost::multi_index::ordered_non_unique<
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boost::multi_index::tag<entry_time>,
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boost::multi_index::identity<CTxMemPoolEntry>,
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CompareTxMemPoolEntryByEntryTime
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>,
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// sorted by score (for mining prioritization)
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boost::multi_index::ordered_unique<
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boost::multi_index::tag<mining_score>,
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boost::multi_index::identity<CTxMemPoolEntry>,
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CompareTxMemPoolEntryByScore
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>,
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// sorted by fee rate with ancestors
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boost::multi_index::ordered_non_unique<
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boost::multi_index::tag<ancestor_score>,
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boost::multi_index::identity<CTxMemPoolEntry>,
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CompareTxMemPoolEntryByAncestorFee
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>
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>
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> indexed_transaction_set;
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mutable CCriticalSection cs;
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indexed_transaction_set mapTx;
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typedef indexed_transaction_set::nth_index<0>::type::iterator txiter;
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std::vector<std::pair<uint256, txiter> > vTxHashes; //!< All tx witness hashes/entries in mapTx, in random order
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struct CompareIteratorByHash {
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bool operator()(const txiter &a, const txiter &b) const {
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return a->GetTx().GetHash() < b->GetTx().GetHash();
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}
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};
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typedef std::set<txiter, CompareIteratorByHash> setEntries;
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const setEntries & GetMemPoolParents(txiter entry) const;
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const setEntries & GetMemPoolChildren(txiter entry) const;
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private:
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typedef std::map<txiter, setEntries, CompareIteratorByHash> cacheMap;
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struct TxLinks {
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setEntries parents;
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setEntries children;
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};
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typedef std::map<txiter, TxLinks, CompareIteratorByHash> txlinksMap;
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txlinksMap mapLinks;
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void UpdateParent(txiter entry, txiter parent, bool add);
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void UpdateChild(txiter entry, txiter child, bool add);
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std::vector<indexed_transaction_set::const_iterator> GetSortedDepthAndScore() const;
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public:
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indirectmap<COutPoint, const CTransaction*> mapNextTx;
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std::map<uint256, std::pair<double, CAmount> > mapDeltas;
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/** Create a new CTxMemPool.
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* minReasonableRelayFee should be a feerate which is, roughly, somewhere
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* around what it "costs" to relay a transaction around the network and
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* below which we would reasonably say a transaction has 0-effective-fee.
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*/
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CTxMemPool(const CFeeRate& _minReasonableRelayFee);
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~CTxMemPool();
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/**
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* If sanity-checking is turned on, check makes sure the pool is
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* consistent (does not contain two transactions that spend the same inputs,
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* all inputs are in the mapNextTx array). If sanity-checking is turned off,
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* check does nothing.
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*/
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void check(const CCoinsViewCache *pcoins) const;
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void setSanityCheck(double dFrequency = 1.0) { nCheckFrequency = dFrequency * 4294967295.0; }
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// addUnchecked must updated state for all ancestors of a given transaction,
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// to track size/count of descendant transactions. First version of
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// addUnchecked can be used to have it call CalculateMemPoolAncestors(), and
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// then invoke the second version.
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bool addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry, bool fCurrentEstimate = true);
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bool addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry, setEntries &setAncestors, bool fCurrentEstimate = true);
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void removeRecursive(const CTransaction &tx, std::vector<std::shared_ptr<const CTransaction>>* removed = NULL);
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void removeForReorg(const CCoinsViewCache *pcoins, unsigned int nMemPoolHeight, int flags);
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void removeConflicts(const CTransaction &tx, std::vector<std::shared_ptr<const CTransaction>>* removed = NULL);
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void removeForBlock(const std::vector<CTransaction>& vtx, unsigned int nBlockHeight,
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std::vector<std::shared_ptr<const CTransaction>>* conflicts = NULL, bool fCurrentEstimate = true);
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void clear();
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void _clear(); //lock free
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bool CompareDepthAndScore(const uint256& hasha, const uint256& hashb);
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void queryHashes(std::vector<uint256>& vtxid);
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void pruneSpent(const uint256& hash, CCoins &coins);
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unsigned int GetTransactionsUpdated() const;
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void AddTransactionsUpdated(unsigned int n);
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/**
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* Check that none of this transactions inputs are in the mempool, and thus
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* the tx is not dependent on other mempool transactions to be included in a block.
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*/
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bool HasNoInputsOf(const CTransaction& tx) const;
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/** Affect CreateNewBlock prioritisation of transactions */
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void PrioritiseTransaction(const uint256 hash, const std::string strHash, double dPriorityDelta, const CAmount& nFeeDelta);
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void ApplyDeltas(const uint256 hash, double &dPriorityDelta, CAmount &nFeeDelta) const;
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void ClearPrioritisation(const uint256 hash);
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public:
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/** Remove a set of transactions from the mempool.
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* If a transaction is in this set, then all in-mempool descendants must
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* also be in the set, unless this transaction is being removed for being
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* in a block.
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* Set updateDescendants to true when removing a tx that was in a block, so
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* that any in-mempool descendants have their ancestor state updated.
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*/
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void RemoveStaged(setEntries &stage, bool updateDescendants);
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/** When adding transactions from a disconnected block back to the mempool,
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* new mempool entries may have children in the mempool (which is generally
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* not the case when otherwise adding transactions).
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* UpdateTransactionsFromBlock() will find child transactions and update the
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* descendant state for each transaction in hashesToUpdate (excluding any
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* child transactions present in hashesToUpdate, which are already accounted
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* for). Note: hashesToUpdate should be the set of transactions from the
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* disconnected block that have been accepted back into the mempool.
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*/
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void UpdateTransactionsFromBlock(const std::vector<uint256> &hashesToUpdate);
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/** Try to calculate all in-mempool ancestors of entry.
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* (these are all calculated including the tx itself)
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* limitAncestorCount = max number of ancestors
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* limitAncestorSize = max size of ancestors
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* limitDescendantCount = max number of descendants any ancestor can have
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* limitDescendantSize = max size of descendants any ancestor can have
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* errString = populated with error reason if any limits are hit
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* fSearchForParents = whether to search a tx's vin for in-mempool parents, or
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* look up parents from mapLinks. Must be true for entries not in the mempool
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*/
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bool CalculateMemPoolAncestors(const CTxMemPoolEntry &entry, setEntries &setAncestors, uint64_t limitAncestorCount, uint64_t limitAncestorSize, uint64_t limitDescendantCount, uint64_t limitDescendantSize, std::string &errString, bool fSearchForParents = true) const;
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/** Populate setDescendants with all in-mempool descendants of hash.
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* Assumes that setDescendants includes all in-mempool descendants of anything
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* already in it. */
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void CalculateDescendants(txiter it, setEntries &setDescendants);
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/** The minimum fee to get into the mempool, which may itself not be enough
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* for larger-sized transactions.
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* The minReasonableRelayFee constructor arg is used to bound the time it
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* takes the fee rate to go back down all the way to 0. When the feerate
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* would otherwise be half of this, it is set to 0 instead.
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*/
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CFeeRate GetMinFee(size_t sizelimit) const;
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/** Remove transactions from the mempool until its dynamic size is <= sizelimit.
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* pvNoSpendsRemaining, if set, will be populated with the list of transactions
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* which are not in mempool which no longer have any spends in this mempool.
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*/
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void TrimToSize(size_t sizelimit, std::vector<uint256>* pvNoSpendsRemaining=NULL);
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/** Expire all transaction (and their dependencies) in the mempool older than time. Return the number of removed transactions. */
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int Expire(int64_t time);
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unsigned long size()
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{
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LOCK(cs);
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return mapTx.size();
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}
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uint64_t GetTotalTxSize()
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{
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LOCK(cs);
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return totalTxSize;
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}
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bool exists(uint256 hash) const
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{
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LOCK(cs);
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return (mapTx.count(hash) != 0);
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}
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std::shared_ptr<const CTransaction> get(const uint256& hash) const;
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TxMempoolInfo info(const uint256& hash) const;
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std::vector<TxMempoolInfo> infoAll() const;
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/** Estimate fee rate needed to get into the next nBlocks
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* If no answer can be given at nBlocks, return an estimate
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* at the lowest number of blocks where one can be given
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*/
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CFeeRate estimateSmartFee(int nBlocks, int *answerFoundAtBlocks = NULL) const;
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/** Estimate fee rate needed to get into the next nBlocks */
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CFeeRate estimateFee(int nBlocks) const;
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/** Estimate priority needed to get into the next nBlocks
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* If no answer can be given at nBlocks, return an estimate
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* at the lowest number of blocks where one can be given
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*/
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double estimateSmartPriority(int nBlocks, int *answerFoundAtBlocks = NULL) const;
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/** Estimate priority needed to get into the next nBlocks */
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double estimatePriority(int nBlocks) const;
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/** Write/Read estimates to disk */
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bool WriteFeeEstimates(CAutoFile& fileout) const;
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bool ReadFeeEstimates(CAutoFile& filein);
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size_t DynamicMemoryUsage() const;
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private:
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/** UpdateForDescendants is used by UpdateTransactionsFromBlock to update
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* the descendants for a single transaction that has been added to the
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* mempool but may have child transactions in the mempool, eg during a
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* chain reorg. setExclude is the set of descendant transactions in the
|
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* mempool that must not be accounted for (because any descendants in
|
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* setExclude were added to the mempool after the transaction being
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* updated and hence their state is already reflected in the parent
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* state).
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*
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* cachedDescendants will be updated with the descendants of the transaction
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* being updated, so that future invocations don't need to walk the
|
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* same transaction again, if encountered in another transaction chain.
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*/
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void UpdateForDescendants(txiter updateIt,
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cacheMap &cachedDescendants,
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const std::set<uint256> &setExclude);
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/** Update ancestors of hash to add/remove it as a descendant transaction. */
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void UpdateAncestorsOf(bool add, txiter hash, setEntries &setAncestors);
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/** Set ancestor state for an entry */
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void UpdateEntryForAncestors(txiter it, const setEntries &setAncestors);
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/** For each transaction being removed, update ancestors and any direct children.
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* If updateDescendants is true, then also update in-mempool descendants'
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* ancestor state. */
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void UpdateForRemoveFromMempool(const setEntries &entriesToRemove, bool updateDescendants);
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/** Sever link between specified transaction and direct children. */
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void UpdateChildrenForRemoval(txiter entry);
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/** Before calling removeUnchecked for a given transaction,
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* UpdateForRemoveFromMempool must be called on the entire (dependent) set
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* of transactions being removed at the same time. We use each
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* CTxMemPoolEntry's setMemPoolParents in order to walk ancestors of a
|
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* given transaction that is removed, so we can't remove intermediate
|
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* transactions in a chain before we've updated all the state for the
|
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* removal.
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*/
|
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void removeUnchecked(txiter entry);
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};
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|
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/**
|
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* CCoinsView that brings transactions from a memorypool into view.
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* It does not check for spendings by memory pool transactions.
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*/
|
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class CCoinsViewMemPool : public CCoinsViewBacked
|
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{
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protected:
|
|
const CTxMemPool& mempool;
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|
|
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public:
|
|
CCoinsViewMemPool(CCoinsView* baseIn, const CTxMemPool& mempoolIn);
|
|
bool GetCoins(const uint256 &txid, CCoins &coins) const;
|
|
bool HaveCoins(const uint256 &txid) const;
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};
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|
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// We want to sort transactions by coin age priority
|
|
typedef std::pair<double, CTxMemPool::txiter> TxCoinAgePriority;
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|
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struct TxCoinAgePriorityCompare
|
|
{
|
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bool operator()(const TxCoinAgePriority& a, const TxCoinAgePriority& b)
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|
{
|
|
if (a.first == b.first)
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return CompareTxMemPoolEntryByScore()(*(b.second), *(a.second)); //Reverse order to make sort less than
|
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return a.first < b.first;
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}
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};
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#endif // BITCOIN_TXMEMPOOL_H
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