Bitcoin Core  22.99.0
P2P Digital Currency
Functions
rbf.cpp File Reference
#include <policy/rbf.h>
#include <policy/settings.h>
#include <tinyformat.h>
#include <util/moneystr.h>
#include <util/rbf.h>
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Functions

RBFTransactionState IsRBFOptIn (const CTransaction &tx, const CTxMemPool &pool)
 Determine whether an unconfirmed transaction is signaling opt-in to RBF according to BIP 125 This involves checking sequence numbers of the transaction, as well as the sequence numbers of all in-mempool ancestors. More...
 
RBFTransactionState IsRBFOptInEmptyMempool (const CTransaction &tx)
 
std::optional< std::string > GetEntriesForConflicts (const CTransaction &tx, CTxMemPool &pool, const CTxMemPool::setEntries &iters_conflicting, CTxMemPool::setEntries &all_conflicts)
 Get all descendants of iters_conflicting. More...
 
std::optional< std::string > HasNoNewUnconfirmed (const CTransaction &tx, const CTxMemPool &pool, const CTxMemPool::setEntries &iters_conflicting)
 BIP125 Rule #2: "The replacement transaction may only include an unconfirmed input if that input was included in one of the original transactions. More...
 
std::optional< std::string > EntriesAndTxidsDisjoint (const CTxMemPool::setEntries &ancestors, const std::set< uint256 > &direct_conflicts, const uint256 &txid)
 Check the intersection between two sets of transactions (a set of mempool entries and a set of txids) to make sure they are disjoint. More...
 
std::optional< std::string > PaysMoreThanConflicts (const CTxMemPool::setEntries &iters_conflicting, CFeeRate replacement_feerate, const uint256 &txid)
 Check that the feerate of the replacement transaction(s) is higher than the feerate of each of the transactions in iters_conflicting. More...
 
std::optional< std::string > PaysForRBF (CAmount original_fees, CAmount replacement_fees, size_t replacement_vsize, CFeeRate relay_fee, const uint256 &txid)
 Enforce BIP125 Rule #3 "The replacement transaction pays an absolute fee of at least the sum paid by the original transactions. More...
 

Function Documentation

◆ EntriesAndTxidsDisjoint()

std::optional<std::string> EntriesAndTxidsDisjoint ( const CTxMemPool::setEntries ancestors,
const std::set< uint256 > &  direct_conflicts,
const uint256 txid 
)

Check the intersection between two sets of transactions (a set of mempool entries and a set of txids) to make sure they are disjoint.

Parameters
[in]ancestorsSet of mempool entries corresponding to ancestors of the replacement transactions.
[in]direct_conflictsSet of txids corresponding to the mempool conflicts (candidates to be replaced).
[in]txidTransaction ID, included in the error message if violation occurs.
Returns
error message if the sets intersect, std::nullopt if they are disjoint.

Definition at line 110 of file rbf.cpp.

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◆ GetEntriesForConflicts()

std::optional<std::string> GetEntriesForConflicts ( const CTransaction tx,
CTxMemPool pool,
const CTxMemPool::setEntries iters_conflicting,
CTxMemPool::setEntries all_conflicts 
)

Get all descendants of iters_conflicting.

Also enforce BIP125 Rule #5, "The number of original transactions to be replaced and their descendant transactions which will be evicted from the mempool must not exceed a total of 100 transactions." Quit as early as possible. There cannot be more than MAX_BIP125_REPLACEMENT_CANDIDATES potential entries.

Parameters
[in]iters_conflictingThe set of iterators to mempool entries.
[out]all_conflictsPopulated with all the mempool entries that would be replaced, which includes descendants of iters_conflicting. Not cleared at the start; any existing mempool entries will remain in the set.
Returns
an error message if Rule #5 is broken, otherwise a std::nullopt.

Definition at line 50 of file rbf.cpp.

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◆ HasNoNewUnconfirmed()

std::optional<std::string> HasNoNewUnconfirmed ( const CTransaction tx,
const CTxMemPool pool,
const CTxMemPool::setEntries iters_conflicting 
)

BIP125 Rule #2: "The replacement transaction may only include an unconfirmed input if that input was included in one of the original transactions.

"

Returns
error message if Rule #2 is broken, otherwise std::nullopt.

Definition at line 78 of file rbf.cpp.

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◆ IsRBFOptIn()

RBFTransactionState IsRBFOptIn ( const CTransaction tx,
const CTxMemPool pool 
)

Determine whether an unconfirmed transaction is signaling opt-in to RBF according to BIP 125 This involves checking sequence numbers of the transaction, as well as the sequence numbers of all in-mempool ancestors.

Parameters
txThe unconfirmed transaction
poolThe mempool, which may contain the tx
Returns
The rbf state

Definition at line 12 of file rbf.cpp.

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◆ IsRBFOptInEmptyMempool()

RBFTransactionState IsRBFOptInEmptyMempool ( const CTransaction tx)

Definition at line 44 of file rbf.cpp.

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◆ PaysForRBF()

std::optional<std::string> PaysForRBF ( CAmount  original_fees,
CAmount  replacement_fees,
size_t  replacement_vsize,
CFeeRate  relay_fee,
const uint256 txid 
)

Enforce BIP125 Rule #3 "The replacement transaction pays an absolute fee of at least the sum paid by the original transactions.

" Enforce BIP125 Rule #4 "The replacement transaction must also pay for its own bandwidth at or above the rate set by the node's minimum relay fee setting."

Parameters
[in]original_feesTotal modified fees of original transaction(s).
[in]replacement_feesTotal modified fees of replacement transaction(s).
[in]replacement_vsizeTotal virtual size of replacement transaction(s).
[in]relay_feeThe node's minimum feerate for transaction relay.
[in]txidTransaction ID, included in the error message if violation occurs.
Returns
error string if fees are insufficient, otherwise std::nullopt.

Definition at line 151 of file rbf.cpp.

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◆ PaysMoreThanConflicts()

std::optional<std::string> PaysMoreThanConflicts ( const CTxMemPool::setEntries iters_conflicting,
CFeeRate  replacement_feerate,
const uint256 txid 
)

Check that the feerate of the replacement transaction(s) is higher than the feerate of each of the transactions in iters_conflicting.

Parameters
[in]iters_conflictingThe set of mempool entries.
Returns
error message if fees insufficient, otherwise std::nullopt.

Definition at line 125 of file rbf.cpp.

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