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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/utxo_snapshot.h>
#include <fs.h>
#include <logging.h>
#include <streams.h>
#include <uint256.h>
#include <util/system.h>
#include <validation.h>
#include <cstdio>
#include <optional>
namespace node {
bool WriteSnapshotBaseBlockhash(Chainstate& snapshot_chainstate)
{
AssertLockHeld(::cs_main);
assert(snapshot_chainstate.m_from_snapshot_blockhash);
const std::optional<fs::path> chaindir = snapshot_chainstate.CoinsDB().StoragePath();
assert(chaindir); // Sanity check that chainstate isn't in-memory.
const fs::path write_to = *chaindir / node::SNAPSHOT_BLOCKHASH_FILENAME;
FILE* file{fsbridge::fopen(write_to, "wb")};
AutoFile afile{file};
if (afile.IsNull()) {
LogPrintf("[snapshot] failed to open base blockhash file for writing: %s\n",
fs::PathToString(write_to));
return false;
}
afile << *snapshot_chainstate.m_from_snapshot_blockhash;
if (afile.fclose() != 0) {
LogPrintf("[snapshot] failed to close base blockhash file %s after writing\n",
fs::PathToString(write_to));
return false;
}
return true;
}
std::optional<uint256> ReadSnapshotBaseBlockhash(fs::path chaindir)
{
if (!fs::exists(chaindir)) {
LogPrintf("[snapshot] cannot read base blockhash: no chainstate dir " /* Continued */
"exists at path %s\n", fs::PathToString(chaindir));
return std::nullopt;
}
const fs::path read_from = chaindir / node::SNAPSHOT_BLOCKHASH_FILENAME;
const std::string read_from_str = fs::PathToString(read_from);
if (!fs::exists(read_from)) {
LogPrintf("[snapshot] snapshot chainstate dir is malformed! no base blockhash file " /* Continued */
"exists at path %s. Try deleting %s and calling loadtxoutset again?\n",
fs::PathToString(chaindir), read_from_str);
return std::nullopt;
}
uint256 base_blockhash;
FILE* file{fsbridge::fopen(read_from, "rb")};
AutoFile afile{file};
if (afile.IsNull()) {
LogPrintf("[snapshot] failed to open base blockhash file for reading: %s\n",
read_from_str);
return std::nullopt;
}
afile >> base_blockhash;
if (std::fgetc(afile.Get()) != EOF) {
LogPrintf("[snapshot] warning: unexpected trailing data in %s\n", read_from_str);
} else if (std::ferror(afile.Get())) {
LogPrintf("[snapshot] warning: i/o error reading %s\n", read_from_str);
}
return base_blockhash;
}
std::optional<fs::path> FindSnapshotChainstateDir()
{
fs::path possible_dir =
gArgs.GetDataDirNet() / fs::u8path(strprintf("chainstate%s", SNAPSHOT_CHAINSTATE_SUFFIX));
if (fs::exists(possible_dir)) {
return possible_dir;
}
return std::nullopt;
}
} // namespace node
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