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Add testing of ComputeBlockVersion

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pull/7575/head
Suhas Daftuar 9 years ago committed by Pieter Wuille
parent d23f6c6a0d
commit 532cbb22b5
3 changed files with 120 additions and 1 deletions
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9
src/chainparams.cpp
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@ -83,6 +83,9 @@ public:
consensus.fPowNoRetargeting = false;
consensus.nRuleChangeActivationThreshold = 1916; // 95% of 2016
consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1199145601; // January 1, 2008
consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
/**
* The message start string is designed to be unlikely to occur in normal data.
* The characters are rarely used upper ASCII, not valid as UTF-8, and produce
@ -166,6 +169,9 @@ public:
consensus.fPowNoRetargeting = false;
consensus.nRuleChangeActivationThreshold = 1512; // 75% for testchains
consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1199145601; // January 1, 2008
consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
pchMessageStart[0] = 0x0b;
pchMessageStart[1] = 0x11;
pchMessageStart[2] = 0x09;
@ -231,6 +237,9 @@ public:
consensus.fPowNoRetargeting = true;
consensus.nRuleChangeActivationThreshold = 108; // 75% for testchains
consensus.nMinerConfirmationWindow = 144; // Faster than normal for regtest (144 instead of 2016)
consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 0;
consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 999999999999ULL;
pchMessageStart[0] = 0xfa;
pchMessageStart[1] = 0xbf;

3
src/consensus/params.h
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@ -14,7 +14,8 @@ namespace Consensus {
enum DeploymentPos
{
MAX_VERSION_BITS_DEPLOYMENTS = 0,
DEPLOYMENT_TESTDUMMY,
MAX_VERSION_BITS_DEPLOYMENTS
};
/**

109
src/test/versionbits_tests.cpp
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@ -6,6 +6,9 @@
#include "random.h"
#include "versionbits.h"
#include "test/test_bitcoin.h"
#include "chainparams.h"
#include "main.h"
#include "consensus/params.h"
#include <boost/test/unit_test.hpp>
@ -124,6 +127,8 @@ public:
num++;
return *this;
}
CBlockIndex * Tip() { return vpblock.size() ? vpblock.back() : NULL; }
};
BOOST_FIXTURE_TEST_SUITE(versionbits_tests, TestingSetup)
@ -182,4 +187,108 @@ BOOST_AUTO_TEST_CASE(versionbits_test)
}
}
BOOST_AUTO_TEST_CASE(versionbits_computeblockversion)
{
// Check that ComputeBlockVersion will set the appropriate bit correctly
// on mainnet.
const Consensus::Params &mainnetParams = Params(CBaseChainParams::MAIN).GetConsensus();
// Use the TESTDUMMY deployment for testing purposes.
int64_t bit = mainnetParams.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit;
int64_t nStartTime = mainnetParams.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime;
int64_t nTimeout = mainnetParams.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout;
assert(nStartTime < nTimeout);
// In the first chain, test that the bit is set by CBV until it has failed.
// In the second chain, test the bit is set by CBV while STARTED and
// LOCKED-IN, and then no longer set while ACTIVE.
VersionBitsTester firstChain, secondChain;
// Start generating blocks before nStartTime
int64_t nTime = nStartTime - 1;
// Before MedianTimePast of the chain has crossed nStartTime, the bit
// should not be set.
CBlockIndex *lastBlock = NULL;
lastBlock = firstChain.Mine(2016, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit), 0);
// Mine 2011 more blocks at the old time, and check that CBV isn't setting the bit yet.
for (int i=1; i<2012; i++) {
lastBlock = firstChain.Mine(2016+i, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
// This works because VERSIONBITS_LAST_OLD_BLOCK_VERSION happens
// to be 4, and the bit we're testing happens to be bit 28.
BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit), 0);
}
// Now mine 5 more blocks at the start time -- MTP should not have passed yet, so
// CBV should still not yet set the bit.
nTime = nStartTime;
for (int i=2012; i<=2016; i++) {
lastBlock = firstChain.Mine(2016+i, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit), 0);
}
// Advance to the next period and transition to STARTED,
lastBlock = firstChain.Mine(6048, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
// so ComputeBlockVersion should now set the bit,
BOOST_CHECK((ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit)) != 0);
// and should also be using the VERSIONBITS_TOP_BITS.
BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & VERSIONBITS_TOP_MASK, VERSIONBITS_TOP_BITS);
// Check that ComputeBlockVersion will set the bit until nTimeout
nTime += 600;
int blocksToMine = 4032; // test blocks for up to 2 time periods
int nHeight = 6048;
// These blocks are all before nTimeout is reached.
while (nTime < nTimeout && blocksToMine > 0) {
lastBlock = firstChain.Mine(nHeight+1, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
BOOST_CHECK((ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit)) != 0);
BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & VERSIONBITS_TOP_MASK, VERSIONBITS_TOP_BITS);
blocksToMine--;
nTime += 600;
nHeight += 1;
};
nTime = nTimeout;
// FAILED is only triggered at the end of a period, so CBV should be setting
// the bit until the period transition.
for (int i=0; i<2015; i++) {
lastBlock = firstChain.Mine(nHeight+1, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
BOOST_CHECK((ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit)) != 0);
nHeight += 1;
}
// The next block should trigger no longer setting the bit.
lastBlock = firstChain.Mine(nHeight+1, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit), 0);
// On a new chain:
// verify that the bit will be set after lock-in, and then stop being set
// after activation.
nTime = nStartTime;
// Mine one period worth of blocks, and check that the bit will be on for the
// next period.
lastBlock = secondChain.Mine(2016, nStartTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
BOOST_CHECK((ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit)) != 0);
// Mine another period worth of blocks, signaling the new bit.
lastBlock = secondChain.Mine(4032, nStartTime, VERSIONBITS_TOP_BITS | (1<<bit)).Tip();
// After one period of setting the bit on each block, it should have locked in.
// We keep setting the bit for one more period though, until activation.
BOOST_CHECK((ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit)) != 0);
// Now check that we keep mining the block until the end of this period, and
// then stop at the beginning of the next period.
lastBlock = secondChain.Mine(6047, nStartTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
BOOST_CHECK((ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit)) != 0);
lastBlock = secondChain.Mine(6048, nStartTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit), 0);
// Finally, verify that after a soft fork has activated, CBV no longer uses
// VERSIONBITS_LAST_OLD_BLOCK_VERSION.
//BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & VERSIONBITS_TOP_MASK, VERSIONBITS_TOP_BITS);
}
BOOST_AUTO_TEST_SUITE_END()

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