BIP9 Implementation
Inspired by former implementations by Eric Lombrozo and Rusty Russell, and based on code by Jorge Timon.
This commit is contained in:
parent
a6a860796a
commit
6851107b3a
12 changed files with 345 additions and 19 deletions
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@ -152,6 +152,7 @@ BITCOIN_CORE_H = \
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utilmoneystr.h \
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utiltime.h \
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validationinterface.h \
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versionbits.h \
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wallet/crypter.h \
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wallet/db.h \
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wallet/rpcwallet.h \
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@ -204,6 +205,7 @@ libbitcoin_server_a_SOURCES = \
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txdb.cpp \
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txmempool.cpp \
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validationinterface.cpp \
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versionbits.cpp \
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$(BITCOIN_CORE_H)
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if ENABLE_ZMQ
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@ -14,8 +14,6 @@
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#include <vector>
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#include <boost/foreach.hpp>
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struct CDiskBlockPos
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{
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int nFile;
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@ -81,6 +81,8 @@ public:
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consensus.nPowTargetSpacing = 10 * 60;
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consensus.fPowAllowMinDifficultyBlocks = false;
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consensus.fPowNoRetargeting = false;
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consensus.nRuleChangeActivationThreshold = 1916; // 95% of 2016
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consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
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/**
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* The message start string is designed to be unlikely to occur in normal data.
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* The characters are rarely used upper ASCII, not valid as UTF-8, and produce
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@ -162,6 +164,8 @@ public:
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consensus.nPowTargetSpacing = 10 * 60;
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consensus.fPowAllowMinDifficultyBlocks = true;
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consensus.fPowNoRetargeting = false;
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consensus.nRuleChangeActivationThreshold = 1512; // 75% for testchains
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consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
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pchMessageStart[0] = 0x0b;
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pchMessageStart[1] = 0x11;
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pchMessageStart[2] = 0x09;
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@ -225,6 +229,8 @@ public:
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consensus.nPowTargetSpacing = 10 * 60;
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consensus.fPowAllowMinDifficultyBlocks = true;
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consensus.fPowNoRetargeting = true;
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consensus.nRuleChangeActivationThreshold = 108; // 75% for testchains
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consensus.nMinerConfirmationWindow = 144; // Faster than normal for regtest (144 instead of 2016)
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pchMessageStart[0] = 0xfa;
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pchMessageStart[1] = 0xbf;
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@ -7,8 +7,28 @@
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#define BITCOIN_CONSENSUS_PARAMS_H
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#include "uint256.h"
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#include <map>
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#include <string>
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namespace Consensus {
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enum DeploymentPos
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{
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MAX_VERSION_BITS_DEPLOYMENTS = 0,
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};
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/**
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* Struct for each individual consensus rule change using BIP9.
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*/
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struct BIP9Deployment {
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/** Bit position to select the particular bit in nVersion. */
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int bit;
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/** Start MedianTime for version bits miner confirmation. Can be a date in the past */
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int64_t nStartTime;
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/** Timeout/expiry MedianTime for the deployment attempt. */
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int64_t nTimeout;
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};
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/**
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* Parameters that influence chain consensus.
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*/
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@ -22,6 +42,14 @@ struct Params {
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/** Block height and hash at which BIP34 becomes active */
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int BIP34Height;
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uint256 BIP34Hash;
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/**
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* Minimum blocks including miner confirmation of the total of 2016 blocks in a retargetting period,
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* (nPowTargetTimespan / nPowTargetSpacing) which is also used for BIP9 deployments.
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* Examples: 1916 for 95%, 1512 for testchains.
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*/
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uint32_t nRuleChangeActivationThreshold;
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uint32_t nMinerConfirmationWindow;
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BIP9Deployment vDeployments[MAX_VERSION_BITS_DEPLOYMENTS];
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/** Proof of work parameters */
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uint256 powLimit;
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bool fPowAllowMinDifficultyBlocks;
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@ -466,7 +466,7 @@ std::string HelpMessage(HelpMessageMode mode)
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strUsage += HelpMessageOpt("-blockmaxsize=<n>", strprintf(_("Set maximum block size in bytes (default: %d)"), DEFAULT_BLOCK_MAX_SIZE));
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strUsage += HelpMessageOpt("-blockprioritysize=<n>", strprintf(_("Set maximum size of high-priority/low-fee transactions in bytes (default: %d)"), DEFAULT_BLOCK_PRIORITY_SIZE));
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if (showDebug)
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strUsage += HelpMessageOpt("-blockversion=<n>", strprintf("Override block version to test forking scenarios (default: %d)", (int)CBlock::CURRENT_VERSION));
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strUsage += HelpMessageOpt("-blockversion=<n>", "Override block version to test forking scenarios");
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strUsage += HelpMessageGroup(_("RPC server options:"));
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strUsage += HelpMessageOpt("-server", _("Accept command line and JSON-RPC commands"));
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80
src/main.cpp
80
src/main.cpp
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@ -34,6 +34,7 @@
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#include "utilmoneystr.h"
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#include "utilstrencodings.h"
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#include "validationinterface.h"
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#include "versionbits.h"
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#include <sstream>
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@ -2083,6 +2084,51 @@ void PartitionCheck(bool (*initialDownloadCheck)(), CCriticalSection& cs, const
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}
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}
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// Protected by cs_main
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static VersionBitsCache versionbitscache;
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int32_t ComputeBlockVersion(const CBlockIndex* pindexPrev, const Consensus::Params& params)
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{
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LOCK(cs_main);
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int32_t nVersion = VERSIONBITS_TOP_BITS;
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for (int i = 0; i < (int)Consensus::MAX_VERSION_BITS_DEPLOYMENTS; i++) {
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ThresholdState state = VersionBitsState(pindexPrev, params, (Consensus::DeploymentPos)i, versionbitscache);
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if (state == THRESHOLD_LOCKED_IN || state == THRESHOLD_STARTED) {
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nVersion |= VersionBitsMask(params, (Consensus::DeploymentPos)i);
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}
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}
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return nVersion;
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}
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/**
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* Threshold condition checker that triggers when unknown versionbits are seen on the network.
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*/
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class WarningBitsConditionChecker : public AbstractThresholdConditionChecker
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{
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private:
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int bit;
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public:
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WarningBitsConditionChecker(int bitIn) : bit(bitIn) {}
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int64_t BeginTime(const Consensus::Params& params) const { return 0; }
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int64_t EndTime(const Consensus::Params& params) const { return std::numeric_limits<int64_t>::max(); }
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int Period(const Consensus::Params& params) const { return params.nMinerConfirmationWindow; }
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int Threshold(const Consensus::Params& params) const { return params.nRuleChangeActivationThreshold; }
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bool Condition(const CBlockIndex* pindex, const Consensus::Params& params) const
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{
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return ((pindex->nVersion & VERSIONBITS_TOP_MASK) == VERSIONBITS_TOP_BITS) &&
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((pindex->nVersion >> bit) & 1) != 0 &&
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((ComputeBlockVersion(pindex->pprev, params) >> bit) & 1) == 0;
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}
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};
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// Protected by cs_main
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static ThresholdConditionCache warningcache[VERSIONBITS_NUM_BITS];
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static int64_t nTimeCheck = 0;
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static int64_t nTimeForks = 0;
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static int64_t nTimeVerify = 0;
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@ -2452,24 +2498,42 @@ void static UpdateTip(CBlockIndex *pindexNew) {
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// Check the version of the last 100 blocks to see if we need to upgrade:
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static bool fWarned = false;
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if (!IsInitialBlockDownload() && !fWarned)
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if (!IsInitialBlockDownload())
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{
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int nUpgraded = 0;
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const CBlockIndex* pindex = chainActive.Tip();
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for (int bit = 0; bit < VERSIONBITS_NUM_BITS; bit++) {
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WarningBitsConditionChecker checker(bit);
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ThresholdState state = checker.GetStateFor(pindex, chainParams.GetConsensus(), warningcache[bit]);
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if (state == THRESHOLD_ACTIVE || state == THRESHOLD_LOCKED_IN) {
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if (state == THRESHOLD_ACTIVE) {
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strMiscWarning = strprintf(_("Warning: unknown new rules activated (versionbit %i)"), bit);
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if (!fWarned) {
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CAlert::Notify(strMiscWarning, true);
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fWarned = true;
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}
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} else {
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LogPrintf("%s: unknown new rules are about to activate (versionbit %i)\n", __func__, bit);
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}
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}
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}
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for (int i = 0; i < 100 && pindex != NULL; i++)
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{
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if (pindex->nVersion > CBlock::CURRENT_VERSION)
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int32_t nExpectedVersion = ComputeBlockVersion(pindex->pprev, chainParams.GetConsensus());
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if (pindex->nVersion > VERSIONBITS_LAST_OLD_BLOCK_VERSION && (pindex->nVersion & ~nExpectedVersion) != 0)
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++nUpgraded;
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pindex = pindex->pprev;
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}
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if (nUpgraded > 0)
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LogPrintf("%s: %d of last 100 blocks above version %d\n", __func__, nUpgraded, (int)CBlock::CURRENT_VERSION);
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LogPrintf("%s: %d of last 100 blocks have unexpected version\n", __func__, nUpgraded);
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if (nUpgraded > 100/2)
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{
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// strMiscWarning is read by GetWarnings(), called by Qt and the JSON-RPC code to warn the user:
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strMiscWarning = _("Warning: This version is obsolete; upgrade required!");
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CAlert::Notify(strMiscWarning, true);
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fWarned = true;
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strMiscWarning = _("Warning: Unknown block versions being mined! It's possible unknown rules are in effect");
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if (!fWarned) {
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CAlert::Notify(strMiscWarning, true);
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fWarned = true;
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}
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}
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}
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}
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@ -3763,6 +3827,10 @@ void UnloadBlockIndex()
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setDirtyFileInfo.clear();
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mapNodeState.clear();
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recentRejects.reset(NULL);
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versionbitscache.Clear();
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for (int b = 0; b < VERSIONBITS_NUM_BITS; b++) {
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warningcache[b].clear();
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}
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BOOST_FOREACH(BlockMap::value_type& entry, mapBlockIndex) {
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delete entry.second;
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@ -537,6 +537,11 @@ extern CBlockTreeDB *pblocktree;
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*/
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int GetSpendHeight(const CCoinsViewCache& inputs);
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/**
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* Determine what nVersion a new block should use.
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*/
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int32_t ComputeBlockVersion(const CBlockIndex* pindexPrev, const Consensus::Params& params);
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/** Reject codes greater or equal to this can be returned by AcceptToMemPool
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* for transactions, to signal internal conditions. They cannot and should not
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* be sent over the P2P network.
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@ -79,11 +79,6 @@ CBlockTemplate* CreateNewBlock(const CChainParams& chainparams, const CScript& s
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return NULL;
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CBlock *pblock = &pblocktemplate->block; // pointer for convenience
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// -regtest only: allow overriding block.nVersion with
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// -blockversion=N to test forking scenarios
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if (chainparams.MineBlocksOnDemand())
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pblock->nVersion = GetArg("-blockversion", pblock->nVersion);
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// Create coinbase tx
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CMutableTransaction txNew;
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txNew.vin.resize(1);
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@ -137,6 +132,12 @@ CBlockTemplate* CreateNewBlock(const CChainParams& chainparams, const CScript& s
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pblock->nTime = GetAdjustedTime();
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const int64_t nMedianTimePast = pindexPrev->GetMedianTimePast();
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pblock->nVersion = ComputeBlockVersion(pindexPrev, chainparams.GetConsensus());
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// -regtest only: allow overriding block.nVersion with
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// -blockversion=N to test forking scenarios
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if (chainparams.MineBlocksOnDemand())
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pblock->nVersion = GetArg("-blockversion", pblock->nVersion);
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int64_t nLockTimeCutoff = (STANDARD_LOCKTIME_VERIFY_FLAGS & LOCKTIME_MEDIAN_TIME_PAST)
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? nMedianTimePast
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: pblock->GetBlockTime();
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@ -21,7 +21,6 @@ class CBlockHeader
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{
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public:
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// header
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static const int32_t CURRENT_VERSION=4;
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int32_t nVersion;
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uint256 hashPrevBlock;
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uint256 hashMerkleRoot;
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@ -49,7 +48,7 @@ public:
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void SetNull()
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{
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nVersion = CBlockHeader::CURRENT_VERSION;
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nVersion = 0;
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hashPrevBlock.SetNull();
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hashMerkleRoot.SetNull();
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nTime = 0;
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@ -247,13 +247,40 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
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// subsidy changing
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int nHeight = chainActive.Height();
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chainActive.Tip()->nHeight = 209999;
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// Create an actual 209999-long block chain (without valid blocks).
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while (chainActive.Tip()->nHeight < 209999) {
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CBlockIndex* prev = chainActive.Tip();
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CBlockIndex* next = new CBlockIndex();
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next->phashBlock = new uint256(GetRandHash());
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pcoinsTip->SetBestBlock(next->GetBlockHash());
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next->pprev = prev;
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next->nHeight = prev->nHeight + 1;
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next->BuildSkip();
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chainActive.SetTip(next);
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}
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BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
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delete pblocktemplate;
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chainActive.Tip()->nHeight = 210000;
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// Extend to a 210000-long block chain.
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while (chainActive.Tip()->nHeight < 210000) {
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CBlockIndex* prev = chainActive.Tip();
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CBlockIndex* next = new CBlockIndex();
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next->phashBlock = new uint256(GetRandHash());
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pcoinsTip->SetBestBlock(next->GetBlockHash());
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next->pprev = prev;
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next->nHeight = prev->nHeight + 1;
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next->BuildSkip();
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chainActive.SetTip(next);
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}
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BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
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delete pblocktemplate;
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chainActive.Tip()->nHeight = nHeight;
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// Delete the dummy blocks again.
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while (chainActive.Tip()->nHeight > nHeight) {
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CBlockIndex* del = chainActive.Tip();
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chainActive.SetTip(del->pprev);
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pcoinsTip->SetBestBlock(del->pprev->GetBlockHash());
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delete del->phashBlock;
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delete del;
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}
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// non-final txs in mempool
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SetMockTime(chainActive.Tip()->GetMedianTimePast()+1);
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133
src/versionbits.cpp
Normal file
133
src/versionbits.cpp
Normal file
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@ -0,0 +1,133 @@
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// Copyright (c) 2016 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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#include "versionbits.h"
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ThresholdState AbstractThresholdConditionChecker::GetStateFor(const CBlockIndex* pindexPrev, const Consensus::Params& params, ThresholdConditionCache& cache) const
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{
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int nPeriod = Period(params);
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int nThreshold = Threshold(params);
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int64_t nTimeStart = BeginTime(params);
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int64_t nTimeTimeout = EndTime(params);
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// A block's state is always the same as that of the first of its period, so it is computed based on a pindexPrev whose height equals a multiple of nPeriod - 1.
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if (pindexPrev != NULL) {
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pindexPrev = pindexPrev->GetAncestor(pindexPrev->nHeight - ((pindexPrev->nHeight + 1) % nPeriod));
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}
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// Walk backwards in steps of nPeriod to find a pindexPrev whose information is known
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std::vector<const CBlockIndex*> vToCompute;
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while (cache.count(pindexPrev) == 0) {
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if (pindexPrev == NULL) {
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// The genesis block is by definition defined.
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cache[pindexPrev] = THRESHOLD_DEFINED;
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break;
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}
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if (pindexPrev->GetMedianTimePast() < nTimeStart) {
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// Optimizaton: don't recompute down further, as we know every earlier block will be before the start time
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cache[pindexPrev] = THRESHOLD_DEFINED;
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break;
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}
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vToCompute.push_back(pindexPrev);
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pindexPrev = pindexPrev->GetAncestor(pindexPrev->nHeight - nPeriod);
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}
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// At this point, cache[pindexPrev] is known
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assert(cache.count(pindexPrev));
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ThresholdState state = cache[pindexPrev];
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// Now walk forward and compute the state of descendants of pindexPrev
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while (!vToCompute.empty()) {
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ThresholdState stateNext = state;
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pindexPrev = vToCompute.back();
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vToCompute.pop_back();
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switch (state) {
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case THRESHOLD_DEFINED: {
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if (pindexPrev->GetMedianTimePast() >= nTimeTimeout) {
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stateNext = THRESHOLD_FAILED;
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} else if (pindexPrev->GetMedianTimePast() >= nTimeStart) {
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stateNext = THRESHOLD_STARTED;
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}
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break;
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}
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case THRESHOLD_STARTED: {
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if (pindexPrev->GetMedianTimePast() >= nTimeTimeout) {
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stateNext = THRESHOLD_FAILED;
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break;
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}
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// We need to count
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const CBlockIndex* pindexCount = pindexPrev;
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int count = 0;
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for (int i = 0; i < nPeriod; i++) {
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if (Condition(pindexCount, params)) {
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count++;
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}
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pindexCount = pindexCount->pprev;
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}
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if (count >= nThreshold) {
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stateNext = THRESHOLD_LOCKED_IN;
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}
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break;
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}
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case THRESHOLD_LOCKED_IN: {
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// Always progresses into ACTIVE.
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stateNext = THRESHOLD_ACTIVE;
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break;
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}
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case THRESHOLD_FAILED:
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case THRESHOLD_ACTIVE: {
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// Nothing happens, these are terminal states.
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break;
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}
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}
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cache[pindexPrev] = state = stateNext;
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}
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return state;
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}
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namespace
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{
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/**
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* Class to implement versionbits logic.
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*/
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class VersionBitsConditionChecker : public AbstractThresholdConditionChecker {
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private:
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const Consensus::DeploymentPos id;
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protected:
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int64_t BeginTime(const Consensus::Params& params) const { return params.vDeployments[id].nStartTime; }
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int64_t EndTime(const Consensus::Params& params) const { return params.vDeployments[id].nTimeout; }
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||||
int Period(const Consensus::Params& params) const { return params.nMinerConfirmationWindow; }
|
||||
int Threshold(const Consensus::Params& params) const { return params.nRuleChangeActivationThreshold; }
|
||||
|
||||
bool Condition(const CBlockIndex* pindex, const Consensus::Params& params) const
|
||||
{
|
||||
return (((pindex->nVersion & VERSIONBITS_TOP_MASK) == VERSIONBITS_TOP_BITS) && (pindex->nVersion & Mask(params)) != 0);
|
||||
}
|
||||
|
||||
public:
|
||||
VersionBitsConditionChecker(Consensus::DeploymentPos id_) : id(id_) {}
|
||||
uint32_t Mask(const Consensus::Params& params) const { return ((uint32_t)1) << params.vDeployments[id].bit; }
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
ThresholdState VersionBitsState(const CBlockIndex* pindexPrev, const Consensus::Params& params, Consensus::DeploymentPos pos, VersionBitsCache& cache)
|
||||
{
|
||||
return VersionBitsConditionChecker(pos).GetStateFor(pindexPrev, params, cache.caches[pos]);
|
||||
}
|
||||
|
||||
uint32_t VersionBitsMask(const Consensus::Params& params, Consensus::DeploymentPos pos)
|
||||
{
|
||||
return VersionBitsConditionChecker(pos).Mask(params);
|
||||
}
|
||||
|
||||
void VersionBitsCache::Clear()
|
||||
{
|
||||
for (unsigned int d = 0; d < Consensus::MAX_VERSION_BITS_DEPLOYMENTS; d++) {
|
||||
caches[d].clear();
|
||||
}
|
||||
}
|
59
src/versionbits.h
Normal file
59
src/versionbits.h
Normal file
|
@ -0,0 +1,59 @@
|
|||
// Copyright (c) 2016 The Bitcoin Core developers
|
||||
// Distributed under the MIT software license, see the accompanying
|
||||
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
||||
|
||||
#ifndef BITCOIN_CONSENSUS_VERSIONBITS
|
||||
#define BITCOIN_CONSENSUS_VERSIONBITS
|
||||
|
||||
#include "chain.h"
|
||||
#include <map>
|
||||
|
||||
/** What block version to use for new blocks (pre versionbits) */
|
||||
static const int32_t VERSIONBITS_LAST_OLD_BLOCK_VERSION = 4;
|
||||
/** What bits to set in version for versionbits blocks */
|
||||
static const int32_t VERSIONBITS_TOP_BITS = 0x20000000UL;
|
||||
/** What bitmask determines whether versionbits is in use */
|
||||
static const int32_t VERSIONBITS_TOP_MASK = 0xE0000000UL;
|
||||
/** Total bits available for versionbits */
|
||||
static const int32_t VERSIONBITS_NUM_BITS = 29;
|
||||
|
||||
enum ThresholdState {
|
||||
THRESHOLD_DEFINED,
|
||||
THRESHOLD_STARTED,
|
||||
THRESHOLD_LOCKED_IN,
|
||||
THRESHOLD_ACTIVE,
|
||||
THRESHOLD_FAILED,
|
||||
};
|
||||
|
||||
// A map that gives the state for blocks whose height is a multiple of Period().
|
||||
// The map is indexed by the block's parent, however, so all keys in the map
|
||||
// will either be NULL or a block with (height + 1) % Period() == 0.
|
||||
typedef std::map<const CBlockIndex*, ThresholdState> ThresholdConditionCache;
|
||||
|
||||
/**
|
||||
* Abstract class that implements BIP9-style threshold logic, and caches results.
|
||||
*/
|
||||
class AbstractThresholdConditionChecker {
|
||||
protected:
|
||||
virtual bool Condition(const CBlockIndex* pindex, const Consensus::Params& params) const =0;
|
||||
virtual int64_t BeginTime(const Consensus::Params& params) const =0;
|
||||
virtual int64_t EndTime(const Consensus::Params& params) const =0;
|
||||
virtual int Period(const Consensus::Params& params) const =0;
|
||||
virtual int Threshold(const Consensus::Params& params) const =0;
|
||||
|
||||
public:
|
||||
// Note that the function below takes a pindexPrev as input: they compute information for block B based on its parent.
|
||||
ThresholdState GetStateFor(const CBlockIndex* pindexPrev, const Consensus::Params& params, ThresholdConditionCache& cache) const;
|
||||
};
|
||||
|
||||
struct VersionBitsCache
|
||||
{
|
||||
ThresholdConditionCache caches[Consensus::MAX_VERSION_BITS_DEPLOYMENTS];
|
||||
|
||||
void Clear();
|
||||
};
|
||||
|
||||
ThresholdState VersionBitsState(const CBlockIndex* pindexPrev, const Consensus::Params& params, Consensus::DeploymentPos pos, VersionBitsCache& cache);
|
||||
uint32_t VersionBitsMask(const Consensus::Params& params, Consensus::DeploymentPos pos);
|
||||
|
||||
#endif
|
Loading…
Reference in a new issue