diff options
Diffstat (limited to 'src/main.cpp')
| -rw-r--r-- | src/main.cpp | 56 |
1 files changed, 54 insertions, 2 deletions
diff --git a/src/main.cpp b/src/main.cpp index 9b43825433..1479df6712 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -477,6 +477,55 @@ bool CTransaction::CheckTransaction() const return true; } +int64 CTransaction::GetMinFee(unsigned int nBlockSize, bool fAllowFree, + enum GetMinFee_mode mode) const +{ + // Base fee is either MIN_TX_FEE or MIN_RELAY_TX_FEE + int64 nBaseFee = (mode == GMF_RELAY) ? MIN_RELAY_TX_FEE : MIN_TX_FEE; + + unsigned int nBytes = ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION); + unsigned int nNewBlockSize = nBlockSize + nBytes; + int64 nMinFee = (1 + (int64)nBytes / 1000) * nBaseFee; + + if (fAllowFree) + { + if (nBlockSize == 1) + { + // Transactions under 10K are free + // (about 4500 BTC if made of 50 BTC inputs) + if (nBytes < 10000) + nMinFee = 0; + } + else + { + // Free transaction area + if (nNewBlockSize < 27000) + nMinFee = 0; + } + } + + // To limit dust spam, require MIN_TX_FEE/MIN_RELAY_TX_FEE if any output is less than 0.01 + if (nMinFee < nBaseFee) + { + BOOST_FOREACH(const CTxOut& txout, vout) + if (txout.nValue < CENT) + nMinFee = nBaseFee; + } + + // Raise the price as the block approaches full + if (nBlockSize != 1 && nNewBlockSize >= MAX_BLOCK_SIZE_GEN/2) + { + if (nNewBlockSize >= MAX_BLOCK_SIZE_GEN) + return MAX_MONEY; + nMinFee *= MAX_BLOCK_SIZE_GEN / (MAX_BLOCK_SIZE_GEN - nNewBlockSize); + } + + if (!MoneyRange(nMinFee)) + nMinFee = MAX_MONEY; + return nMinFee; +} + + bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs, bool* pfMissingInputs) { @@ -563,8 +612,11 @@ bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs, unsigned int nSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION); // Don't accept it if it can't get into a block - if (nFees < tx.GetMinFee(1000, true, GMF_RELAY)) - return error("CTxMemPool::accept() : not enough fees"); + int64 txMinFee = tx.GetMinFee(1000, true, GMF_RELAY); + if (nFees < txMinFee) + return error("CTxMemPool::accept() : not enough fees %s, %"PRI64d" < %"PRI64d, + hash.ToString().substr(0,10).c_str(), + nFees, txMinFee); // Continuously rate-limit free transactions // This mitigates 'penny-flooding' -- sending thousands of free transactions just to |