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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 <kernel/mempool_persist.h>
#include <clientversion.h>
#include <consensus/amount.h>
#include <fs.h>
#include <logging.h>
#include <primitives/transaction.h>
#include <serialize.h>
#include <shutdown.h>
#include <streams.h>
#include <sync.h>
#include <txmempool.h>
#include <uint256.h>
#include <util/system.h>
#include <util/time.h>
#include <validation.h>
#include <chrono>
#include <cstdint>
#include <cstdio>
#include <exception>
#include <functional>
#include <map>
#include <memory>
#include <set>
#include <stdexcept>
#include <utility>
#include <vector>
using fsbridge::FopenFn;
namespace kernel {
static const uint64_t MEMPOOL_DUMP_VERSION = 1;
bool LoadMempool(CTxMemPool& pool, const fs::path& load_path, Chainstate& active_chainstate, FopenFn mockable_fopen_function)
{
if (load_path.empty()) return false;
FILE* filestr{mockable_fopen_function(load_path, "rb")};
CAutoFile file(filestr, SER_DISK, CLIENT_VERSION);
if (file.IsNull()) {
LogPrintf("Failed to open mempool file from disk. 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;
auto now = NodeClock::now();
try {
uint64_t version;
file >> version;
if (version != MEMPOOL_DUMP_VERSION) {
return false;
}
uint64_t num;
file >> num;
while (num) {
--num;
CTransactionRef tx;
int64_t nTime;
int64_t nFeeDelta;
file >> tx;
file >> nTime;
file >> nFeeDelta;
CAmount amountdelta = nFeeDelta;
if (amountdelta) {
pool.PrioritiseTransaction(tx->GetHash(), amountdelta);
}
if (nTime > TicksSinceEpoch<std::chrono::seconds>(now - pool.m_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 (ShutdownRequested())
return false;
}
std::map<uint256, CAmount> mapDeltas;
file >> mapDeltas;
for (const auto& i : mapDeltas) {
pool.PrioritiseTransaction(i.first, i.second);
}
std::set<uint256> unbroadcast_txids;
file >> unbroadcast_txids;
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) {
LogPrintf("Failed to deserialize mempool data on disk: %s. Continuing anyway.\n", e.what());
return false;
}
LogPrintf("Imported mempool transactions from disk: %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();
try {
FILE* filestr{mockable_fopen_function(dump_path + ".new", "wb")};
if (!filestr) {
return false;
}
CAutoFile file(filestr, SER_DISK, CLIENT_VERSION);
uint64_t version = MEMPOOL_DUMP_VERSION;
file << version;
file << (uint64_t)vinfo.size();
for (const auto& i : vinfo) {
file << *(i.tx);
file << int64_t{count_seconds(i.m_time)};
file << int64_t{i.nFeeDelta};
mapDeltas.erase(i.tx->GetHash());
}
file << mapDeltas;
LogPrintf("Writing %d unbroadcast transactions to disk.\n", unbroadcast_txids.size());
file << unbroadcast_txids;
if (!skip_file_commit && !FileCommit(file.Get()))
throw std::runtime_error("FileCommit failed");
file.fclose();
if (!RenameOver(dump_path + ".new", dump_path)) {
throw std::runtime_error("Rename failed");
}
auto last = SteadyClock::now();
LogPrintf("Dumped mempool: %gs to copy, %gs to dump\n",
Ticks<SecondsDouble>(mid - start),
Ticks<SecondsDouble>(last - mid));
} catch (const std::exception& e) {
LogPrintf("Failed to dump mempool: %s. Continuing anyway.\n", e.what());
return false;
}
return true;
}
} // namespace kernel
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