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hardfork: allow per-fork voting thresholds 

And setup the first fork to not vote
This commit is contained in:
moneromooo-monero 2015-11-08 13:04:41 +00:00
parent 6a01030533
commit 4187e569d8
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GPG Key ID: 686F07454D6CEFC3
4 changed files with 70 additions and 21 deletions
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14
src/cryptonote_core/blockchain.cpp
View File

@ -72,23 +72,25 @@ DISABLE_VS_WARNINGS(4267)
static const struct {
uint8_t version;
uint64_t height;
uint8_t threshold;
time_t time;
} mainnet_hard_forks[] = {
// version 1 from the start of the blockchain
{ 1, 1, 1341378000 },
{ 1, 1, 0, 1341378000 },
// version 2 can start from block 1009827, setup on the 20th of september
{ 2, 1009827, 1442763710 },
// version 2 can start from block 1009827, setup on the 20th of september. No vote.
{ 2, 1009827, 0, 1442763710 },
};
static const uint64_t mainnet_hard_fork_version_1_till = 750000;
static const struct {
uint8_t version;
uint64_t height;
uint8_t threshold;
time_t time;
} testnet_hard_forks[] = {
// version 1 from the start of the blockchain
{ 1, 1, 1341378000 },
{ 1, 1, 0, 1341378000 },
};
static const uint64_t testnet_hard_fork_version_1_till = 540000;
@ -252,13 +254,13 @@ bool Blockchain::init(BlockchainDB* db, const bool testnet)
if (testnet) {
m_hardfork = new HardFork(*db, 1, testnet_hard_fork_version_1_till);
for (size_t n = 0; n < sizeof(testnet_hard_forks) / sizeof(testnet_hard_forks[0]); ++n)
m_hardfork->add(testnet_hard_forks[n].version, testnet_hard_forks[n].height, testnet_hard_forks[n].time);
m_hardfork->add(testnet_hard_forks[n].version, testnet_hard_forks[n].height, testnet_hard_forks[n].threshold, testnet_hard_forks[n].time);
}
else
{
m_hardfork = new HardFork(*db, 1, mainnet_hard_fork_version_1_till);
for (size_t n = 0; n < sizeof(mainnet_hard_forks) / sizeof(mainnet_hard_forks[0]); ++n)
m_hardfork->add(mainnet_hard_forks[n].version, mainnet_hard_forks[n].height, mainnet_hard_forks[n].time);
m_hardfork->add(mainnet_hard_forks[n].version, mainnet_hard_forks[n].height, mainnet_hard_forks[n].threshold, mainnet_hard_forks[n].time);
}
m_hardfork->init();

25
src/cryptonote_core/hardfork.cpp
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@ -46,22 +46,22 @@ static uint8_t get_block_vote(const cryptonote::block &b)
return b.minor_version;
}
HardFork::HardFork(cryptonote::BlockchainDB &db, uint8_t original_version, uint64_t original_version_till_height, time_t forked_time, time_t update_time, uint64_t window_size, int threshold_percent):
HardFork::HardFork(cryptonote::BlockchainDB &db, uint8_t original_version, uint64_t original_version_till_height, time_t forked_time, time_t update_time, uint64_t window_size, uint8_t default_threshold_percent):
db(db),
original_version(original_version),
original_version_till_height(original_version_till_height),
forked_time(forked_time),
update_time(update_time),
window_size(window_size),
threshold_percent(threshold_percent)
default_threshold_percent(default_threshold_percent)
{
if (window_size == 0)
throw "window_size needs to be strictly positive";
if (threshold_percent > 100)
throw "threshold_percent needs to be between 0 and 100";
if (default_threshold_percent > 100)
throw "default_threshold_percent needs to be between 0 and 100";
}
bool HardFork::add(uint8_t version, uint64_t height, time_t time)
bool HardFork::add(uint8_t version, uint64_t height, uint8_t threshold, time_t time)
{
CRITICAL_REGION_LOCAL(lock);
@ -76,10 +76,17 @@ bool HardFork::add(uint8_t version, uint64_t height, time_t time)
if (time <= heights.back().time)
return false;
}
heights.push_back(Params(version, height, time));
if (threshold > 100)
return false;
heights.push_back(Params(version, height, threshold, time));
return true;
}
bool HardFork::add(uint8_t version, uint64_t height, time_t time)
{
return add(version, height, default_threshold_percent, time);
}
uint8_t HardFork::get_effective_version(uint8_t version) const
{
if (!heights.empty()) {
@ -146,7 +153,6 @@ void HardFork::init()
for (size_t n = 0; n < 256; ++n)
last_versions[n] = 0;
current_fork_index = 0;
vote_threshold = (uint32_t)ceilf(window_size * threshold_percent / 100.0f);
// restore state from DB
uint64_t height = db.height();
@ -274,7 +280,8 @@ int HardFork::get_voted_fork_index(uint64_t height) const
for (unsigned int n = heights.size() - 1; n > current_fork_index; --n) {
uint8_t v = heights[n].version;
accumulated_votes += last_versions[v];
if (height >= heights[n].height && accumulated_votes >= vote_threshold) {
uint32_t threshold = (window_size * heights[n].threshold + 99) / 100;
if (height >= heights[n].height && accumulated_votes >= threshold) {
return n;
}
}
@ -340,7 +347,7 @@ bool HardFork::get_voting_info(uint8_t version, uint32_t &window, uint32_t &vote
votes = 0;
for (size_t n = version; n < 256; ++n)
votes += last_versions[n];
threshold = vote_threshold;
threshold = (window * heights[current_version].threshold + 99) / 100;
assert((votes >= threshold) == enabled);
voting = heights.back().version;
return enabled;

24
src/cryptonote_core/hardfork.h
View File

@ -48,7 +48,7 @@ namespace cryptonote
static const time_t DEFAULT_FORKED_TIME = 31557600; // a year in seconds
static const time_t DEFAULT_UPDATE_TIME = 31557600 / 2;
static const uint64_t DEFAULT_WINDOW_SIZE = 10080; // supermajority window check length - a week
static const int DEFAULT_THRESHOLD_PERCENT = 80;
static const uint8_t DEFAULT_THRESHOLD_PERCENT = 80;
/**
* @brief creates a new HardFork object
@ -57,9 +57,21 @@ namespace cryptonote
* @param forked_time the time in seconds before thinking we're forked
* @param update_time the time in seconds before thinking we need to update
* @param window_size the size of the window in blocks to consider for version voting
* @param threshold_percent the size of the majority in percents
* @param default_threshold_percent the size of the majority in percents
*/
HardFork(cryptonote::BlockchainDB &db, uint8_t original_version = 1, uint64_t original_version_till_height = DEFAULT_ORIGINAL_VERSION_TILL_HEIGHT, time_t forked_time = DEFAULT_FORKED_TIME, time_t update_time = DEFAULT_UPDATE_TIME, uint64_t window_size = DEFAULT_WINDOW_SIZE, int threshold_percent = DEFAULT_THRESHOLD_PERCENT);
HardFork(cryptonote::BlockchainDB &db, uint8_t original_version = 1, uint64_t original_version_till_height = DEFAULT_ORIGINAL_VERSION_TILL_HEIGHT, time_t forked_time = DEFAULT_FORKED_TIME, time_t update_time = DEFAULT_UPDATE_TIME, uint64_t window_size = DEFAULT_WINDOW_SIZE, uint8_t default_threshold_percent = DEFAULT_THRESHOLD_PERCENT);
/**
* @brief add a new hardfork height
*
* returns true if no error, false otherwise
*
* @param version the major block version for the fork
* @param height The height the hardfork takes effect
* @param threshold The threshold of votes needed for this fork (0-100)
* @param time Approximate time of the hardfork (seconds since epoch)
*/
bool add(uint8_t version, uint64_t height, uint8_t threshold, time_t time);
/**
* @brief add a new hardfork height
@ -199,23 +211,23 @@ namespace cryptonote
time_t forked_time;
time_t update_time;
uint64_t window_size;
int threshold_percent;
uint8_t default_threshold_percent;
uint8_t original_version;
uint64_t original_version_till_height;
struct Params {
uint8_t version;
uint8_t threshold;
uint64_t height;
time_t time;
Params(uint8_t version, uint64_t height, time_t time): version(version), height(height), time(time) {}
Params(uint8_t version, uint64_t height, uint8_t threshold, time_t time): version(version), threshold(threshold), height(height), time(time) {}
};
std::vector<Params> heights;
std::deque<uint8_t> versions; /* rolling window of the last N blocks' versions */
unsigned int last_versions[256]; /* count of the block versions in the last N blocks */
uint32_t current_fork_index;
uint32_t vote_threshold;
mutable epee::critical_section lock;
};

28
tests/unit_tests/hardfork.cpp
View File

@ -352,6 +352,34 @@ TEST(voting, threshold)
}
}
TEST(voting, different_thresholds)
{
for (int threshold = 87; threshold <= 88; ++threshold) {
TestDB db;
HardFork hf(db, 1, 0, 1, 1, 4, 50); // window size 4
// v h t
ASSERT_TRUE(hf.add(1, 0, 0));
ASSERT_TRUE(hf.add(2, 5, 0, 1)); // asap
ASSERT_TRUE(hf.add(3, 10, 100, 2)); // all votes
ASSERT_TRUE(hf.add(4, 15, 3)); // default 50% votes
hf.init();
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9
static const uint8_t block_versions[] = { 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4 };
static const uint8_t expected_versions[] = { 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4 };
for (uint64_t h = 0; h < sizeof(block_versions) / sizeof(block_versions[0]); ++h) {
db.add_block(mkblock(block_versions[h]), 0, 0, 0, crypto::hash());
bool ret = hf.add(db.get_block_from_height(h), h);
ASSERT_EQ(ret, true);
}
for (uint64_t h = 0; h < sizeof(expected_versions) / sizeof(expected_versions[0]); ++h) {
ASSERT_EQ(hf.get(h), expected_versions[h]);
}
}
}
TEST(new_blocks, denied)
{
TestDB db;