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