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BIP141: Other consensus critical limits, and BIP145

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Includes changes by Suhas Daftuar, Luke-jr, and mruddy.
This commit is contained in:
Pieter Wuille
2016-01-03 18:54:50 +01:00
parent 7c4bf779e8
commit 2b1f6f9ccf
31 changed files with 344 additions and 136 deletions
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14
src/policy/policy.cpp
View File

@@ -64,8 +64,8 @@ bool IsStandardTx(const CTransaction& tx, std::string& reason)
// almost as much to process as they cost the sender in fees, because
// computing signature hashes is O(ninputs*txsize). Limiting transactions
// to MAX_STANDARD_TX_SIZE mitigates CPU exhaustion attacks.
unsigned int sz = tx.GetSerializeSize(SER_NETWORK, CTransaction::CURRENT_VERSION);
if (sz >= MAX_STANDARD_TX_SIZE) {
unsigned int sz = GetTransactionCost(tx);
if (sz >= MAX_STANDARD_TX_COST) {
reason = "tx-size";
return false;
}
@@ -150,3 +150,13 @@ bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
return true;
}
int64_t GetVirtualTransactionSize(int64_t nCost)
{
return (nCost + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR;
}
int64_t GetVirtualTransactionSize(const CTransaction& tx)
{
return GetVirtualTransactionSize(GetTransactionCost(tx));
}

10
src/policy/policy.h
View File

@@ -19,12 +19,14 @@ static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 750000;
static const unsigned int DEFAULT_BLOCK_MIN_SIZE = 0;
/** Default for -blockprioritysize, maximum space for zero/low-fee transactions **/
static const unsigned int DEFAULT_BLOCK_PRIORITY_SIZE = 0;
/** Default for -blockmaxcost, which control the range of block costs the mining code will create **/
static const unsigned int DEFAULT_BLOCK_MAX_COST = 3000000;
/** The maximum size for transactions we're willing to relay/mine */
static const unsigned int MAX_STANDARD_TX_SIZE = 100000;
static const unsigned int MAX_STANDARD_TX_COST = 400000;
/** Maximum number of signature check operations in an IsStandard() P2SH script */
static const unsigned int MAX_P2SH_SIGOPS = 15;
/** The maximum number of sigops we're willing to relay/mine in a single tx */
static const unsigned int MAX_STANDARD_TX_SIGOPS = MAX_BLOCK_SIGOPS/5;
static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/5;
/** Default for -maxmempool, maximum megabytes of mempool memory usage */
static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300;
/**
@@ -65,4 +67,8 @@ bool IsStandardTx(const CTransaction& tx, std::string& reason);
*/
bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
/** Compute the virtual transaction size (cost reinterpreted as bytes). */
int64_t GetVirtualTransactionSize(int64_t nCost);
int64_t GetVirtualTransactionSize(const CTransaction& tx);
#endif // BITCOIN_POLICY_POLICY_H