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stratum_server.cpp
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stratum_server.cpp
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/*
* This file is part of the Monero P2Pool <https://github.com/SChernykh/p2pool>
* Copyright (c) 2021-2024 SChernykh <https://github.com/SChernykh>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
#include "stratum_server.h"
#include "block_template.h"
#include "p2pool.h"
#include "side_chain.h"
#include "params.h"
#include "p2pool_api.h"
LOG_CATEGORY(StratumServer)
static constexpr int DEFAULT_BACKLOG = 128;
static constexpr uint64_t DEFAULT_BAN_TIME = 600;
static constexpr uint64_t MIN_DIFF = 1000;
static constexpr uint64_t AUTO_DIFF_TARGET_TIME = 30;
// Use short target format (4 bytes) for diff <= 4 million
static constexpr uint64_t TARGET_4_BYTES_LIMIT = std::numeric_limits<uint64_t>::max() / 4000001;
static constexpr uint64_t AUTODIFF_START = std::numeric_limits<uint64_t>::max() / 500001;
static constexpr int32_t BAD_SHARE_POINTS = -5;
static constexpr int32_t GOOD_SHARE_POINTS = 1;
static constexpr int32_t BAN_THRESHOLD_POINTS = -15;
namespace p2pool {
StratumServer::StratumServer(p2pool* pool)
: TCPServer(DEFAULT_BACKLOG, StratumClient::allocate, std::string())
, m_pool(pool)
, m_autoDiff(pool->params().m_autoDiff)
, m_rng(RandomDeviceSeed::instance)
, m_cumulativeHashes(0)
, m_cumulativeHashesAtLastShare(0)
, m_hashrateDataHead(0)
, m_hashrateDataTail_15m(0)
, m_hashrateDataTail_1h(0)
, m_hashrateDataTail_24h(0)
, m_cumulativeFoundSharesDiff(0.0)
, m_totalFoundShares(0)
, m_totalFailedShares(0)
, m_apiLastUpdateTime(0)
{
m_callbackBuf.resize(STRATUM_BUF_SIZE);
// Diffuse the initial state in case it has low quality
m_rng.discard(10000);
m_hashrateData[0] = { seconds_since_epoch(), 0 };
uv_mutex_init_checked(&m_blobsQueueLock);
uv_mutex_init_checked(&m_showWorkersLock);
uv_mutex_init_checked(&m_rngLock);
uv_rwlock_init_checked(&m_hashrateDataLock);
m_extraNonce = get_random32();
m_submittedSharesPool.resize(10);
for (size_t i = 0; i < m_submittedSharesPool.size(); ++i) {
SubmittedShare* share = new SubmittedShare{};
ASAN_POISON_MEMORY_REGION(share, sizeof(SubmittedShare));
m_submittedSharesPool[i] = share;
}
uv_async_init_checked(&m_loop, &m_blobsAsync, on_blobs_ready);
m_blobsAsync.data = this;
m_blobsQueue.reserve(2);
uv_async_init_checked(&m_loop, &m_showWorkersAsync, on_show_workers);
m_showWorkersAsync.data = this;
const Params& params = pool->params();
start_listening(params.m_stratumAddresses, params.m_upnp && params.m_upnpStratum);
}
StratumServer::~StratumServer()
{
shutdown_tcp();
{
MutexLock lock(m_blobsQueueLock);
for (BlobsData* data : m_blobsQueue) {
delete data;
}
}
uv_mutex_destroy(&m_blobsQueueLock);
uv_mutex_destroy(&m_showWorkersLock);
uv_mutex_destroy(&m_rngLock);
uv_rwlock_destroy(&m_hashrateDataLock);
for (SubmittedShare* share : m_submittedSharesPool) {
ASAN_UNPOISON_MEMORY_REGION(share, sizeof(SubmittedShare));
delete share;
}
}
void StratumServer::on_block(const BlockTemplate& block)
{
LOGINFO(4, "new block template at height " << block.height());
const uint32_t num_connections = m_numConnections;
if (num_connections == 0) {
LOGINFO(4, "no clients connected");
api_update_local_stats(seconds_since_epoch());
return;
}
const uint32_t extra_nonce_start = get_random32();
m_extraNonce.exchange(extra_nonce_start + num_connections);
BlobsData* blobs_data = new BlobsData{};
blobs_data->m_extraNonceStart = extra_nonce_start;
difficulty_type difficulty;
difficulty_type aux_diff;
difficulty_type sidechain_difficulty;
size_t nonce_offset;
// More clients might connect between now and when we actually go through clients list - get_hashing_blobs() and async send take some time
// Even if they do, they'll be added to the beginning of the list and will get their block template in on_login()
// We'll iterate through the list backwards so when we get to the beginning and run out of extra_nonce values, it'll be only new clients left
blobs_data->m_numClientsExpected = num_connections;
blobs_data->m_blobSize = block.get_hashing_blobs(extra_nonce_start, num_connections, blobs_data->m_blobs, blobs_data->m_height, difficulty, aux_diff, sidechain_difficulty, blobs_data->m_seedHash, nonce_offset, blobs_data->m_templateId);
// Integrity checks
if (blobs_data->m_blobSize < 76) {
LOGERR(1, "internal error: get_hashing_blobs returned too small blobs (" << blobs_data->m_blobSize << " bytes)");
}
else if (blobs_data->m_blobs.size() != blobs_data->m_blobSize * num_connections) {
LOGERR(1, "internal error: get_hashing_blobs returned wrong amount of data");
}
else if (pool_block_debug() && (num_connections > 1)) {
std::vector<uint64_t> blob_hashes;
blob_hashes.reserve(num_connections);
const uint8_t* data = blobs_data->m_blobs.data();
const size_t size = blobs_data->m_blobSize;
// Get first 8 bytes of the Merkle root hash from each blob
for (size_t i = 0; i < num_connections; ++i) {
blob_hashes.emplace_back(read_unaligned(reinterpret_cast<const uint64_t*>(data + i * size + 43)));
}
// Find duplicates
std::sort(blob_hashes.begin(), blob_hashes.end());
for (uint32_t i = 1; i < num_connections; ++i) {
if (blob_hashes[i - 1] == blob_hashes[i]) {
LOGERR(1, "internal error: get_hashing_blobs returned two identical blobs");
break;
}
}
}
blobs_data->m_target = std::max(difficulty.target(), sidechain_difficulty.target());
blobs_data->m_target = std::max(blobs_data->m_target, aux_diff.target());
{
MutexLock lock(m_blobsQueueLock);
if (uv_is_closing(reinterpret_cast<uv_handle_t*>(&m_blobsAsync))) {
delete blobs_data;
return;
}
m_blobsQueue.push_back(blobs_data);
const int err = uv_async_send(&m_blobsAsync);
if (err) {
LOGERR(1, "uv_async_send failed, error " << uv_err_name(err));
m_blobsQueue.pop_back();
delete blobs_data;
}
}
api_update_local_stats(seconds_since_epoch());
}
template<size_t N>
static bool get_custom_user(const char* s, char (&user)[N])
{
size_t len = 0;
// Find first of '+' or '.', drop non-printable characters
while (s && (len < N - 1)) {
const char c = *s;
if (!c) {
break;
}
if ((c == '+') || (c == '.')) {
break;
}
// Limit to printable ASCII characters, also skip comma and JSON special characters
if (c >= ' ' && c <= '~' && c != ',' && c != '"' && c != '\\') {
user[len++] = c;
}
++s;
}
user[len] = '\0';
return (len > 0);
}
static bool get_custom_diff(const char* s, difficulty_type& diff)
{
const char* diff_str = nullptr;
// Find last of '+' or '.'
while (s) {
const char c = *s;
if (!c) {
break;
}
if ((c == '+') || (c == '.')) {
diff_str = s;
}
++s;
}
if (diff_str) {
const uint64_t t = strtoull(diff_str + 1, nullptr, 10);
if (t) {
// Don't let clients set difficulty less than MIN_DIFF
diff = { std::max<uint64_t>(t + 1, MIN_DIFF), 0 };
return true;
}
}
return false;
}
bool StratumServer::on_login(StratumClient* client, uint32_t id, const char* login)
{
if (client->m_rpcId) {
LOGWARN(4, "client " << static_cast<char*>(client->m_addrString) << " tried to login, but it's already logged in");
return false;
}
const uint32_t extra_nonce = m_extraNonce.fetch_add(1);
uint8_t hashing_blob[128];
uint64_t height, sidechain_height;
difficulty_type difficulty;
difficulty_type aux_diff;
difficulty_type sidechain_difficulty;
hash seed_hash;
size_t nonce_offset;
uint32_t template_id;
const size_t blob_size = m_pool->block_template().get_hashing_blob(extra_nonce, hashing_blob, height, sidechain_height, difficulty, aux_diff, sidechain_difficulty, seed_hash, nonce_offset, template_id);
uint64_t target = std::max(difficulty.target(), sidechain_difficulty.target());
target = std::max(target, aux_diff.target());
if (get_custom_diff(login, client->m_customDiff)) {
LOGINFO(5, "client " << log::Gray() << static_cast<char*>(client->m_addrString) << " set custom difficulty " << client->m_customDiff);
target = std::max(target, client->m_customDiff.target());
}
else if (m_autoDiff) {
// Limit autodiff to 4000000 for maximum compatibility
target = std::max(std::max(target, AUTODIFF_START), TARGET_4_BYTES_LIMIT);
}
if (get_custom_user(login, client->m_customUser)) {
const char* s = client->m_customUser;
LOGINFO(5, "client " << log::Gray() << static_cast<char*>(client->m_addrString) << " set custom user " << s);
}
uint32_t job_id;
{
job_id = ++client->m_perConnectionJobId;
StratumClient::SavedJob& saved_job = client->m_jobs[job_id % StratumClient::JOBS_SIZE];
saved_job.job_id = job_id;
saved_job.extra_nonce = extra_nonce;
saved_job.template_id = template_id;
saved_job.target = target;
}
client->m_lastJobTarget = target;
const bool result = send(client,
[client, id, &hashing_blob, job_id, blob_size, target, height, &seed_hash](uint8_t* buf, size_t buf_size)
{
do {
client->m_rpcId = static_cast<StratumServer*>(client->m_owner)->get_random32();
} while (!client->m_rpcId);
log::hex_buf target_hex(&target);
if (target >= TARGET_4_BYTES_LIMIT) {
target_hex.m_data += sizeof(uint32_t);
target_hex.m_size -= sizeof(uint32_t);
}
log::Stream s(buf, buf_size);
s << "{\"id\":" << id << ",\"jsonrpc\":\"2.0\",\"result\":{\"id\":\"";
s << log::Hex(client->m_rpcId) << "\",\"job\":{\"blob\":\"";
s << log::hex_buf(hashing_blob, blob_size) << "\",\"job_id\":\"";
s << log::Hex(job_id) << "\",\"target\":\"";
s << target_hex << "\",\"algo\":\"rx/0\",\"height\":";
s << height << ",\"seed_hash\":\"";
s << seed_hash << "\"},\"extensions\":[\"algo\"],\"status\":\"OK\"}}\n";
return s.m_pos;
});
return result;
}
bool StratumServer::on_submit(StratumClient* client, uint32_t id, const char* job_id_str, const char* nonce_str, const char* result_str)
{
uint32_t job_id = 0;
for (size_t i = 0; job_id_str[i]; ++i) {
uint32_t d;
if (!from_hex(job_id_str[i], d)) {
LOGWARN(4, "client " << static_cast<char*>(client->m_addrString) << " invalid params ('job_id' is not a hex integer)");
return false;
}
job_id = (job_id << 4) + d;
}
if (!job_id) {
LOGWARN(4, "client " << static_cast<char*>(client->m_addrString) << " invalid params ('job_id' can't be 0)");
return false;
}
uint32_t nonce = 0;
for (int i = static_cast<int>(sizeof(uint32_t)) - 1; i >= 0; --i) {
uint32_t d[2];
if (!from_hex(nonce_str[i * 2], d[0]) || !from_hex(nonce_str[i * 2 + 1], d[1])) {
LOGWARN(4, "client " << static_cast<char*>(client->m_addrString) << " invalid params ('nonce' is not a hex integer)");
return false;
}
nonce = (nonce << 8) | (d[0] << 4) | d[1];
}
hash resultHash;
for (size_t i = 0; i < HASH_SIZE; ++i) {
uint32_t d[2];
if (!from_hex(result_str[i * 2], d[0]) || !from_hex(result_str[i * 2 + 1], d[1])) {
LOGWARN(4, "client " << static_cast<char*>(client->m_addrString) << " invalid params ('result' is not a hex value)");
return false;
}
resultHash.h[i] = static_cast<uint8_t>((d[0] << 4) | d[1]);
}
uint32_t template_id = 0;
uint32_t extra_nonce = 0;
uint64_t target = 0;
bool found = false;
{
const StratumClient::SavedJob& saved_job = client->m_jobs[job_id % StratumClient::JOBS_SIZE];
if (saved_job.job_id == job_id) {
template_id = saved_job.template_id;
extra_nonce = saved_job.extra_nonce;
target = saved_job.target;
found = true;
}
}
if (found) {
const BlockTemplate& block = m_pool->block_template();
uint64_t height, sidechain_height;
difficulty_type mainchain_diff, aux_diff, sidechain_diff;
if (!block.get_difficulties(template_id, height, sidechain_height, mainchain_diff, aux_diff, sidechain_diff)) {
LOGWARN(4, "client " << static_cast<char*>(client->m_addrString) << " got a stale share");
return send(client,
[id](uint8_t* buf, size_t buf_size)
{
log::Stream s(buf, buf_size);
s << "{\"id\":" << id << ",\"jsonrpc\":\"2.0\",\"error\":{\"message\":\"Stale share\"}}\n";
return s.m_pos;
});
}
if (mainchain_diff.check_pow(resultHash)) {
const char* s = client->m_customUser;
LOGINFO(0, log::Green() << "client " << static_cast<char*>(client->m_addrString) << (*s ? " user " : "") << s << " found a mainchain block at height " << height << ", submitting it");
m_pool->submit_block_async(template_id, nonce, extra_nonce);
}
if (aux_diff.check_pow(resultHash)) {
const std::vector<AuxChainData> aux_chains = block.get_aux_chains(template_id);
std::vector<p2pool::SubmitAuxBlockData> aux_blocks;
aux_blocks.reserve(aux_chains.size());
for (const AuxChainData& aux_data : aux_chains) {
if (aux_data.difficulty.check_pow(resultHash)) {
const char* s = client->m_customUser;
LOGINFO(0, log::Green() << "client " << static_cast<char*>(client->m_addrString) << (*s ? " user " : "") << s << " found an aux block for chain_id " << aux_data.unique_id << ", diff " << aux_data.difficulty << ", submitting it");
aux_blocks.emplace_back(p2pool::SubmitAuxBlockData{ aux_data.unique_id, template_id, nonce, extra_nonce });
}
}
if (!aux_blocks.empty()) {
m_pool->submit_aux_block_async(aux_blocks);
}
}
SubmittedShare* share;
if (!m_submittedSharesPool.empty()) {
share = m_submittedSharesPool.back();
m_submittedSharesPool.pop_back();
ASAN_UNPOISON_MEMORY_REGION(share, sizeof(SubmittedShare));
}
else {
share = new SubmittedShare{};
}
if (target >= TARGET_4_BYTES_LIMIT) {
// "Low diff share" fix: adjust target to the same value as XMRig would use
target = std::numeric_limits<uint64_t>::max() / (std::numeric_limits<uint32_t>::max() / (target >> 32));
}
share->m_req.data = share;
share->m_server = this;
share->m_client = client;
share->m_clientIPv6 = client->m_isV6;
share->m_clientAddr = client->m_addr;
memcpy(share->m_clientAddrString, client->m_addrString, sizeof(share->m_clientAddrString));
memcpy(share->m_clientCustomUser, client->m_customUser, sizeof(share->m_clientCustomUser));
share->m_clientResetCounter = client->m_resetCounter.load();
share->m_rpcId = client->m_rpcId;
share->m_id = id;
share->m_templateId = template_id;
share->m_nonce = nonce;
share->m_extraNonce = extra_nonce;
share->m_target = target;
share->m_resultHash = resultHash;
share->m_sidechainDifficulty = sidechain_diff;
share->m_mainchainHeight = height;
share->m_sidechainHeight = sidechain_height;
share->m_effort = -1.0;
share->m_timestamp = seconds_since_epoch();
uint64_t rem;
share->m_hashes = (target > 1) ? udiv128(1, 0, target, &rem) : 1;
share->m_highEnoughDifficulty = sidechain_diff.check_pow(resultHash);
share->m_score = 0;
// Don't count shares that were found during sync
const SideChain& side_chain = m_pool->side_chain();
const PoolBlock* tip = side_chain.chainTip();
if (tip && (sidechain_height + side_chain.chain_window_size() < tip->m_sidechainHeight)) {
share->m_highEnoughDifficulty = false;
}
update_auto_diff(client, share->m_timestamp, share->m_hashes);
// If this share is below sidechain difficulty, process it in this thread because it'll be quick
if (!share->m_highEnoughDifficulty) {
on_share_found(&share->m_req);
on_after_share_found(&share->m_req, 0);
return true;
}
// Else switch to a worker thread to check PoW which can take a long time
const int err = uv_queue_work(&m_loop, &share->m_req, on_share_found, on_after_share_found);
if (err) {
LOGERR(1, "uv_queue_work failed, error " << uv_err_name(err));
// If uv_queue_work failed, process this share here anyway
on_share_found(&share->m_req);
on_after_share_found(&share->m_req, 0);
}
return true;
}
LOGWARN(4, "client " << static_cast<char*>(client->m_addrString) << " got a share with invalid job id " << job_id << " (latest job sent has id " << client->m_perConnectionJobId << ')');
const bool result = send(client,
[id](uint8_t* buf, size_t buf_size)
{
log::Stream s(buf, buf_size);
s << "{\"id\":" << id << ",\"jsonrpc\":\"2.0\",\"error\":{\"message\":\"Invalid job id\"}}\n";
return s.m_pos;
});
return result;
}
uint32_t StratumServer::get_random32()
{
MutexLock lock(m_rngLock);
return static_cast<uint32_t>(m_rng() >> 32);
}
void StratumServer::print_status()
{
update_hashrate_data(0, seconds_since_epoch());
print_stratum_status();
}
void StratumServer::show_workers_async()
{
MutexLock lock(m_showWorkersLock);
if (!uv_is_closing(reinterpret_cast<uv_handle_t*>(&m_showWorkersAsync))) {
uv_async_send(&m_showWorkersAsync);
}
}
void StratumServer::show_workers()
{
check_event_loop_thread(__func__);
const uint64_t cur_time = seconds_since_epoch();
const difficulty_type pool_diff = m_pool->side_chain().difficulty();
int addr_len = 0;
for (const StratumClient* c = static_cast<StratumClient*>(m_connectedClientsList->m_next); c != m_connectedClientsList; c = static_cast<StratumClient*>(c->m_next)) {
addr_len = std::max(addr_len, static_cast<int>(strlen(c->m_addrString)));
}
size_t n = 0;
LOGINFO(0, log::pad_right("IP:port", addr_len + 8)
<< log::pad_right("uptime", 20)
<< log::pad_right("difficulty", 20)
<< log::pad_right("hashrate", 15)
<< "name"
);
for (const StratumClient* c = static_cast<StratumClient*>(m_connectedClientsList->m_next); c != m_connectedClientsList; c = static_cast<StratumClient*>(c->m_next)) {
difficulty_type diff = pool_diff;
if (c->m_lastJobTarget > 1) {
uint64_t r;
diff.lo = udiv128(1, 0, c->m_lastJobTarget, &r);
diff.hi = 0;
if (r) {
++diff.lo;
}
}
LOGINFO(0, log::pad_right(static_cast<const char*>(c->m_addrString), addr_len + 8)
<< log::pad_right(log::Duration(cur_time - c->m_connectedTime), 20)
<< log::pad_right(diff, 20)
<< log::pad_right(log::Hashrate(c->m_autoDiff.lo / AUTO_DIFF_TARGET_TIME, m_autoDiff && (c->m_autoDiff != 0)), 15)
<< (c->m_rpcId ? c->m_customUser : "not logged in")
);
++n;
}
LOGINFO(0, "Total: " << n << " workers");
}
void StratumServer::reset_share_counters()
{
WriteLock lock(m_hashrateDataLock);
m_cumulativeHashesAtLastShare = m_cumulativeHashes;
m_totalFoundShares = 0;
m_totalFailedShares = 0;
}
const char* StratumServer::get_log_category() const
{
return log_category_prefix;
}
void StratumServer::print_stratum_status() const
{
uint64_t hashes_15m, hashes_1h, hashes_24h, total_hashes;
int64_t dt_15m, dt_1h, dt_24h;
uint64_t hashes_since_last_share;
double average_effort;
uint32_t shares_found, shares_failed;
{
ReadLock lock(m_hashrateDataLock);
total_hashes = m_cumulativeHashes;
hashes_since_last_share = m_cumulativeHashes - m_cumulativeHashesAtLastShare;
const HashrateData* data = m_hashrateData;
const HashrateData& head = data[m_hashrateDataHead];
const HashrateData& tail_15m = data[m_hashrateDataTail_15m];
const HashrateData& tail_1h = data[m_hashrateDataTail_1h];
const HashrateData& tail_24h = data[m_hashrateDataTail_24h];
hashes_15m = head.m_cumulativeHashes - tail_15m.m_cumulativeHashes;
dt_15m = static_cast<int64_t>(head.m_timestamp - tail_15m.m_timestamp);
hashes_1h = head.m_cumulativeHashes - tail_1h.m_cumulativeHashes;
dt_1h = static_cast<int64_t>(head.m_timestamp - tail_1h.m_timestamp);
hashes_24h = head.m_cumulativeHashes - tail_24h.m_cumulativeHashes;
dt_24h = static_cast<int64_t>(head.m_timestamp - tail_24h.m_timestamp);
average_effort = 0.0;
const double diff = m_cumulativeFoundSharesDiff;
if (diff > 0.0) {
average_effort = static_cast<double>(m_cumulativeHashesAtLastShare) * 100.0 / diff;
}
shares_found = m_totalFoundShares;
shares_failed = m_totalFailedShares;
}
const uint64_t hashrate_15m = (dt_15m > 0) ? (hashes_15m / dt_15m) : 0;
const uint64_t hashrate_1h = (dt_1h > 0) ? (hashes_1h / dt_1h ) : 0;
const uint64_t hashrate_24h = (dt_24h > 0) ? (hashes_24h / dt_24h) : 0;
char shares_failed_buf[64] = {};
if (shares_failed) {
log::Stream s(shares_failed_buf);
s << log::Yellow() << "\nShares failed = " << shares_failed << log::NoColor();
}
LOGINFO(0, "status" <<
"\nHashrate (15m est) = " << log::Hashrate(hashrate_15m) <<
"\nHashrate (1h est) = " << log::Hashrate(hashrate_1h) <<
"\nHashrate (24h est) = " << log::Hashrate(hashrate_24h) <<
"\nTotal hashes = " << total_hashes <<
"\nShares found = " << shares_found << static_cast<const char*>(shares_failed_buf) <<
"\nAverage effort = " << average_effort << '%' <<
"\nCurrent effort = " << static_cast<double>(hashes_since_last_share) * 100.0 / m_pool->side_chain().difficulty().to_double() << '%' <<
"\nConnections = " << m_numConnections.load() << " (" << m_numIncomingConnections.load() << " incoming)"
);
}
// Compresses 64-bit hashes value into 16-bit value (5 bits for shift, 11 bits for data)
namespace {
enum HashValue : uint64_t {
bits = 11,
mask = (1 << bits) - 1,
};
static constexpr FORCEINLINE uint64_t hash_uncompress(uint64_t h)
{
return (h & HashValue::mask) << (h >> HashValue::bits);
};
enum HashMaxValue : uint64_t {
value = hash_uncompress(std::numeric_limits<uint16_t>::max())
};
static FORCEINLINE uint16_t hash_compress(uint64_t h)
{
if (h <= HashValue::mask) {
return static_cast<uint16_t>(h);
}
if (h >= HashMaxValue::value) {
return std::numeric_limits<uint16_t>::max();
}
const uint64_t shift = bsr(h) - (HashValue::bits - 1);
return static_cast<uint16_t>((shift << HashValue::bits) | (h >> shift));
}
}
void StratumServer::update_auto_diff(StratumClient* client, const uint64_t timestamp, const uint64_t hashes)
{
const uint16_t hashes_compressed = hash_compress(hashes);
client->m_autoDiffWindowHashes += hash_uncompress(hashes_compressed);
const uint32_t k = client->m_autoDiffIndex++;
constexpr uint32_t N = StratumClient::AUTO_DIFF_SIZE;
StratumClient::AutoDiffData& auto_diff_data = client->m_autoDiffData[k % N];
if (k >= N) {
client->m_autoDiffWindowHashes -= hash_uncompress(auto_diff_data.m_hashes);
}
const uint16_t t1 = auto_diff_data.m_timestamp;
const uint16_t t2 = static_cast<uint16_t>(timestamp);
auto_diff_data.m_timestamp = t2;
auto_diff_data.m_hashes = hashes_compressed;
if (k >= N) {
// Full window
const uint16_t dt = t2 - t1;
client->m_autoDiff.lo = std::max<uint64_t>((client->m_autoDiffWindowHashes * AUTO_DIFF_TARGET_TIME) / (dt ? dt : 1), MIN_DIFF);
client->m_autoDiff.hi = 0;
}
else if (k >= 10) {
// Partial window
const uint64_t h0 = hash_uncompress(client->m_autoDiffData[0].m_hashes);
const uint16_t dt = client->m_autoDiffData[k].m_timestamp - client->m_autoDiffData[0].m_timestamp;
client->m_autoDiff.lo = std::max<uint64_t>(((client->m_autoDiffWindowHashes - h0) * AUTO_DIFF_TARGET_TIME) / (dt ? dt : 1), MIN_DIFF);
client->m_autoDiff.hi = 0;
}
else if (k == 0) {
// First share, fix auto diff to current difficulty until we have at least 10 shares
client->m_autoDiff.lo = hashes;
client->m_autoDiff.hi = 0;
}
}
void StratumServer::on_blobs_ready()
{
check_event_loop_thread(__func__);
std::vector<BlobsData*> blobs_queue;
blobs_queue.reserve(2);
{
MutexLock lock(m_blobsQueueLock);
blobs_queue = m_blobsQueue;
m_blobsQueue.clear();
}
if (blobs_queue.empty()) {
return;
}
ON_SCOPE_LEAVE([&blobs_queue]()
{
for (BlobsData* data : blobs_queue) {
delete data;
}
});
// Only send the latest blob
BlobsData* data = blobs_queue.back();
const uint32_t extra_nonce_start = data->m_extraNonceStart;
size_t numClientsProcessed = 0;
uint32_t num_sent = 0;
const uint64_t cur_time = seconds_since_epoch();
for (StratumClient* client = static_cast<StratumClient*>(m_connectedClientsList->m_prev); client != m_connectedClientsList; client = static_cast<StratumClient*>(client->m_prev)) {
++numClientsProcessed;
if (!client->m_rpcId) {
// Not logged in yet, on_login() will send the job to this client. Also close inactive connections.
if (cur_time >= client->m_connectedTime + 10) {
LOGWARN(4, "client " << static_cast<char*>(client->m_addrString) << " didn't send login data");
client->ban(DEFAULT_BAN_TIME);
client->close();
}
continue;
}
if (num_sent >= data->m_numClientsExpected) {
// We don't have any more extra_nonce values available
continue;
}
uint8_t* hashing_blob = data->m_blobs.data() + num_sent * data->m_blobSize;
uint64_t target = data->m_target;
if (client->m_customDiff.lo) {
target = std::max(target, client->m_customDiff.target());
}
else if (m_autoDiff) {
// Limit autodiff to 4000000 for maximum compatibility
target = std::max(target, TARGET_4_BYTES_LIMIT);
if (client->m_autoDiff.lo) {
const uint32_t k = client->m_autoDiffIndex;
const uint16_t elapsed_time = static_cast<uint16_t>(cur_time) - client->m_autoDiffData[(k - 1) % StratumClient::AUTO_DIFF_SIZE].m_timestamp;
if (elapsed_time > AUTO_DIFF_TARGET_TIME * 5) {
// More than 500% effort, reduce the auto diff by 1/8 every time until the share is found
client->m_autoDiff.lo = std::max<uint64_t>(client->m_autoDiff.lo - client->m_autoDiff.lo / 8, MIN_DIFF);
}
target = std::max(target, client->m_autoDiff.target());
}
else {
// Not enough shares from the client yet, start with 500k diff and cut diff in half every 16 seconds
target = std::max(target, AUTODIFF_START);
const uint64_t num_halvings = (cur_time - client->m_connectedTime) / 16;
constexpr uint64_t max_target = (std::numeric_limits<uint64_t>::max() / MIN_DIFF) + 1;
for (uint64_t i = 0; (i < num_halvings) && (target < max_target); ++i) {
target *= 2;
}
target = std::min<uint64_t>(target, max_target);
}
}
uint32_t job_id;
{
job_id = ++client->m_perConnectionJobId;
StratumClient::SavedJob& saved_job = client->m_jobs[job_id % StratumClient::JOBS_SIZE];
saved_job.job_id = job_id;
saved_job.extra_nonce = extra_nonce_start + num_sent;
saved_job.template_id = data->m_templateId;
saved_job.target = target;
}
client->m_lastJobTarget = target;
const bool result = send(client,
[data, target, hashing_blob, job_id](uint8_t* buf, size_t buf_size)
{
log::hex_buf target_hex(&target);
if (target >= TARGET_4_BYTES_LIMIT) {
target_hex.m_data += sizeof(uint32_t);
target_hex.m_size -= sizeof(uint32_t);
}
log::Stream s(buf, buf_size);
s << "{\"jsonrpc\":\"2.0\",\"method\":\"job\",\"params\":{\"blob\":\"";
s << log::hex_buf(hashing_blob, data->m_blobSize) << "\",\"job_id\":\"";
s << log::Hex(job_id) << "\",\"target\":\"";
s << target_hex << "\",\"algo\":\"rx/0\",\"height\":";
s << data->m_height << ",\"seed_hash\":\"";
s << data->m_seedHash << "\"}}\n";
return s.m_pos;
});
if (result) {
++num_sent;
}
else {
client->close();
}
}
const uint32_t num_connections = m_numConnections;
if (numClientsProcessed != num_connections) {
LOGWARN(1, "client list is broken, expected " << num_connections << ", got " << numClientsProcessed << " clients");
}
LOGINFO(3, "sent new job to " << num_sent << '/' << numClientsProcessed << " clients");
}
void StratumServer::update_hashrate_data(uint64_t hashes, uint64_t timestamp)
{
constexpr size_t N = array_size(&StratumServer::m_hashrateData);
WriteLock lock(m_hashrateDataLock);
m_cumulativeHashes += hashes;
HashrateData* data = m_hashrateData;
HashrateData& head = data[m_hashrateDataHead];
if (head.m_timestamp == timestamp) {
head.m_cumulativeHashes = m_cumulativeHashes;
}
else {
m_hashrateDataHead = (m_hashrateDataHead + 1) % N;
data[m_hashrateDataHead] = { timestamp, m_cumulativeHashes };
}
while (data[m_hashrateDataTail_15m].m_timestamp + 15 * 60 < timestamp) {
m_hashrateDataTail_15m = (m_hashrateDataTail_15m + 1) % N;
}
while (data[m_hashrateDataTail_1h].m_timestamp + 60 * 60 < timestamp) {
m_hashrateDataTail_1h = (m_hashrateDataTail_1h + 1) % N;
}
while (data[m_hashrateDataTail_24h].m_timestamp + 60 * 60 * 24 < timestamp) {
m_hashrateDataTail_24h = (m_hashrateDataTail_24h + 1) % N;
}
}
void StratumServer::on_share_found(uv_work_t* req)
{
SubmittedShare* share = reinterpret_cast<SubmittedShare*>(req->data);
StratumServer* server = share->m_server;
if (server->is_banned(share->m_clientIPv6, share->m_clientAddr)) {
share->m_highEnoughDifficulty = false;
share->m_result = SubmittedShare::Result::BANNED;
return;
}
if (share->m_highEnoughDifficulty) {
BACKGROUND_JOB_START(StratumServer::on_share_found);
}
p2pool* pool = server->m_pool;
const uint64_t target = share->m_target;
const uint64_t hashes = share->m_hashes;
if (pool->stopped()) {
LOGWARN(0, "p2pool is shutting down, but a share was found. Trying to process it anyway!");
}
if (share->m_highEnoughDifficulty) {
uint8_t blob[128];
uint64_t height;
difficulty_type difficulty;
difficulty_type aux_diff;
difficulty_type sidechain_difficulty;
hash seed_hash;
size_t nonce_offset;
const uint32_t blob_size = pool->block_template().get_hashing_blob(share->m_templateId, share->m_extraNonce, blob, height, difficulty, aux_diff, sidechain_difficulty, seed_hash, nonce_offset);
if (!blob_size) {
LOGWARN(4, "client " << static_cast<char*>(share->m_clientAddrString) << " got a stale share");
share->m_result = SubmittedShare::Result::STALE;
return;
}
for (uint32_t i = 0, nonce = share->m_nonce; i < sizeof(share->m_nonce); ++i) {
blob[nonce_offset + i] = nonce & 255;
nonce >>= 8;
}
hash pow_hash;
if (!pool->calculate_hash(blob, blob_size, height, seed_hash, pow_hash, false)) {
LOGWARN(3, "client " << static_cast<char*>(share->m_clientAddrString) << " couldn't check share PoW");
share->m_result = SubmittedShare::Result::COULDNT_CHECK_POW;
return;
}
if (pow_hash != share->m_resultHash) {
LOGWARN(4, "client " << static_cast<char*>(share->m_clientAddrString) << " submitted a share with invalid PoW");
share->m_result = SubmittedShare::Result::INVALID_POW;
share->m_score = BAD_SHARE_POINTS;
// Calculate the same hash second time to check if it's an unstable hardware that caused this
hash pow_hash2;
if (pool->calculate_hash(blob, blob_size, height, seed_hash, pow_hash2, true) && (pow_hash2 != pow_hash)) {
LOGERR(0, "UNSTABLE HARDWARE DETECTED: Calculated the same hash twice, got different results: " << pow_hash << " != " << pow_hash2);
}
return;
}
share->m_score = GOOD_SHARE_POINTS;
const double diff = sidechain_difficulty.to_double();
{
WriteLock lock(server->m_hashrateDataLock);
const uint64_t n = server->m_cumulativeHashes + hashes;
share->m_effort = static_cast<double>(n - server->m_cumulativeHashesAtLastShare) * 100.0 / diff;
server->m_cumulativeHashesAtLastShare = n;
server->m_cumulativeFoundSharesDiff += diff;
++server->m_totalFoundShares;
}
if (!pool->submit_sidechain_block(share->m_templateId, share->m_nonce, share->m_extraNonce)) {
WriteLock lock(server->m_hashrateDataLock);
if (server->m_totalFoundShares > 0) {
--server->m_totalFoundShares;
++server->m_totalFailedShares;
}
}
}
// Send the response to miner
const uint64_t value = share->m_resultHash.u64()[HASH_SIZE / sizeof(uint64_t) - 1];
if (LIKELY(value < target)) {
const uint64_t timestamp = share->m_timestamp;
server->update_hashrate_data(hashes, timestamp);
server->api_update_local_stats(timestamp);
share->m_result = SubmittedShare::Result::OK;
}
else {
LOGWARN(4, "client " << static_cast<char*>(share->m_clientAddrString) << " got a low diff share");
share->m_result = SubmittedShare::Result::LOW_DIFF;
share->m_score = BAD_SHARE_POINTS;
}
}
void StratumServer::on_after_share_found(uv_work_t* req, int /*status*/)
{
SubmittedShare* share = reinterpret_cast<SubmittedShare*>(req->data);
if (share->m_highEnoughDifficulty) {
const char* s = share->m_clientCustomUser;
if (share->m_result == SubmittedShare::Result::OK) {
LOGINFO(0, log::Green() << "SHARE FOUND: mainchain height " << share->m_mainchainHeight << ", sidechain height " << share->m_sidechainHeight << ", diff " << share->m_sidechainDifficulty << ", client " << static_cast<char*>(share->m_clientAddrString) << (*s ? ", user " : "") << s << ", effort " << share->m_effort << '%');
}
else {
static const char* reason_list[] = {
"stale share",