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// Copyright (c) 2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <node/mempool_persist.h>
#include <clientversion.h>
#include <consensus/amount.h>
#include <logging.h>
#include <primitives/transaction.h>
#include <random.h>
#include <serialize.h>
#include <streams.h>
#include <sync.h>
#include <txmempool.h>
#include <uint256.h>
#include <util/fs.h>
#include <util/fs_helpers.h>
#include <util/signalinterrupt.h>
#include <util/time.h>
#include <validation.h>
#include <cstdint>
#include <cstdio>
#include <exception>
#include <functional>
#include <map>
#include <memory>
#include <set>
#include <stdexcept>
#include <utility>
#include <vector>
using fsbridge::FopenFn;
namespace node {
static const uint64_t MEMPOOL_DUMP_VERSION_NO_XOR_KEY{1};
static const uint64_t MEMPOOL_DUMP_VERSION{2};
bool LoadMempool(CTxMemPool& pool, const fs::path& load_path, Chainstate& active_chainstate, ImportMempoolOptions&& opts)
{
if (load_path.empty()) return false;
AutoFile file{opts.mockable_fopen_function(load_path, "rb")};
if (file.IsNull()) {
LogInfo("Failed to open mempool file. Continuing anyway.\n");
return false;
}
int64_t count = 0;
int64_t expired = 0;
int64_t failed = 0;
int64_t already_there = 0;
int64_t unbroadcast = 0;
const auto now{NodeClock::now()};
try {
uint64_t version;
file >> version;
std::vector<std::byte> xor_key;
if (version == MEMPOOL_DUMP_VERSION_NO_XOR_KEY) {
// Leave XOR-key empty
} else if (version == MEMPOOL_DUMP_VERSION) {
file >> xor_key;
} else {
return false;
}
file.SetXor(xor_key);
uint64_t total_txns_to_load;
file >> total_txns_to_load;
uint64_t txns_tried = 0;
LogInfo("Loading %u mempool transactions from file...\n", total_txns_to_load);
int next_tenth_to_report = 0;
while (txns_tried < total_txns_to_load) {
const int percentage_done(100.0 * txns_tried / total_txns_to_load);
if (next_tenth_to_report < percentage_done / 10) {
LogInfo("Progress loading mempool transactions from file: %d%% (tried %u, %u remaining)\n",
percentage_done, txns_tried, total_txns_to_load - txns_tried);
next_tenth_to_report = percentage_done / 10;
}
++txns_tried;
CTransactionRef tx;
int64_t nTime;
int64_t nFeeDelta;
file >> TX_WITH_WITNESS(tx);
file >> nTime;
file >> nFeeDelta;
if (opts.use_current_time) {
nTime = TicksSinceEpoch<std::chrono::seconds>(now);
}
CAmount amountdelta = nFeeDelta;
if (amountdelta && opts.apply_fee_delta_priority) {
pool.PrioritiseTransaction(tx->GetHash(), amountdelta);
}
if (nTime > TicksSinceEpoch<std::chrono::seconds>(now - pool.m_opts.expiry)) {
LOCK(cs_main);
const auto& accepted = AcceptToMemoryPool(active_chainstate, tx, nTime, /*bypass_limits=*/false, /*test_accept=*/false);
if (accepted.m_result_type == MempoolAcceptResult::ResultType::VALID) {
++count;
} else {
// mempool may contain the transaction already, e.g. from
// wallet(s) having loaded it while we were processing
// mempool transactions; consider these as valid, instead of
// failed, but mark them as 'already there'
if (pool.exists(GenTxid::Txid(tx->GetHash()))) {
++already_there;
} else {
++failed;
}
}
} else {
++expired;
}
if (active_chainstate.m_chainman.m_interrupt)
return false;
}
std::map<uint256, CAmount> mapDeltas;
file >> mapDeltas;
if (opts.apply_fee_delta_priority) {
for (const auto& i : mapDeltas) {
pool.PrioritiseTransaction(i.first, i.second);
}
}
std::set<uint256> unbroadcast_txids;
file >> unbroadcast_txids;
if (opts.apply_unbroadcast_set) {
unbroadcast = unbroadcast_txids.size();
for (const auto& txid : unbroadcast_txids) {
// Ensure transactions were accepted to mempool then add to
// unbroadcast set.
if (pool.get(txid) != nullptr) pool.AddUnbroadcastTx(txid);
}
}
} catch (const std::exception& e) {
LogInfo("Failed to deserialize mempool data on file: %s. Continuing anyway.\n", e.what());
return false;
}
LogInfo("Imported mempool transactions from file: %i succeeded, %i failed, %i expired, %i already there, %i waiting for initial broadcast\n", count, failed, expired, already_there, unbroadcast);
return true;
}
bool DumpMempool(const CTxMemPool& pool, const fs::path& dump_path, FopenFn mockable_fopen_function, bool skip_file_commit)
{
auto start = SteadyClock::now();
std::map<uint256, CAmount> mapDeltas;
std::vector<TxMempoolInfo> vinfo;
std::set<uint256> unbroadcast_txids;
static Mutex dump_mutex;
LOCK(dump_mutex);
{
LOCK(pool.cs);
for (const auto &i : pool.mapDeltas) {
mapDeltas[i.first] = i.second;
}
vinfo = pool.infoAll();
unbroadcast_txids = pool.GetUnbroadcastTxs();
}
auto mid = SteadyClock::now();
AutoFile file{mockable_fopen_function(dump_path + ".new", "wb")};
if (file.IsNull()) {
return false;
}
try {
const uint64_t version{pool.m_opts.persist_v1_dat ? MEMPOOL_DUMP_VERSION_NO_XOR_KEY : MEMPOOL_DUMP_VERSION};
file << version;
std::vector<std::byte> xor_key(8);
if (!pool.m_opts.persist_v1_dat) {
FastRandomContext{}.fillrand(xor_key);
file << xor_key;
}
file.SetXor(xor_key);
uint64_t mempool_transactions_to_write(vinfo.size());
file << mempool_transactions_to_write;
LogInfo("Writing %u mempool transactions to file...\n", mempool_transactions_to_write);
for (const auto& i : vinfo) {
file << TX_WITH_WITNESS(*(i.tx));
file << int64_t{count_seconds(i.m_time)};
file << int64_t{i.nFeeDelta};
mapDeltas.erase(i.tx->GetHash());
}
file << mapDeltas;
LogInfo("Writing %d unbroadcast transactions to file.\n", unbroadcast_txids.size());
file << unbroadcast_txids;
if (!skip_file_commit && !file.Commit())
throw std::runtime_error("Commit failed");
file.fclose();
if (!RenameOver(dump_path + ".new", dump_path)) {
throw std::runtime_error("Rename failed");
}
auto last = SteadyClock::now();
LogInfo("Dumped mempool: %.3fs to copy, %.3fs to dump, %d bytes dumped to file\n",
Ticks<SecondsDouble>(mid - start),
Ticks<SecondsDouble>(last - mid),
fs::file_size(dump_path));
} catch (const std::exception& e) {
LogInfo("Failed to dump mempool: %s. Continuing anyway.\n", e.what());
return false;
}
return true;
}
} // namespace node
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