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252abd1e8b
Add functionality for activating a snapshot-based chainstate if one is detected on-disk. Also cautiously initialize chainstate cache usages so that we don't somehow blow past our cache allowances during initialization, then rebalance at the end of init. Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2021 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_NODE_UTXO_SNAPSHOT_H
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#define BITCOIN_NODE_UTXO_SNAPSHOT_H
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#include <fs.h>
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#include <uint256.h>
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#include <serialize.h>
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#include <validation.h>
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#include <optional>
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extern RecursiveMutex cs_main;
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namespace node {
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//! Metadata describing a serialized version of a UTXO set from which an
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//! assumeutxo Chainstate can be constructed.
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class SnapshotMetadata
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{
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public:
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//! The hash of the block that reflects the tip of the chain for the
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//! UTXO set contained in this snapshot.
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uint256 m_base_blockhash;
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//! The number of coins in the UTXO set contained in this snapshot. Used
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//! during snapshot load to estimate progress of UTXO set reconstruction.
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uint64_t m_coins_count = 0;
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SnapshotMetadata() { }
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SnapshotMetadata(
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const uint256& base_blockhash,
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uint64_t coins_count,
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unsigned int nchaintx) :
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m_base_blockhash(base_blockhash),
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m_coins_count(coins_count) { }
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SERIALIZE_METHODS(SnapshotMetadata, obj) { READWRITE(obj.m_base_blockhash, obj.m_coins_count); }
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};
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//! The file in the snapshot chainstate dir which stores the base blockhash. This is
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//! needed to reconstruct snapshot chainstates on init.
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//!
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//! Because we only allow loading a single snapshot at a time, there will only be one
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//! chainstate directory with this filename present within it.
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const fs::path SNAPSHOT_BLOCKHASH_FILENAME{"base_blockhash"};
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//! Write out the blockhash of the snapshot base block that was used to construct
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//! this chainstate. This value is read in during subsequent initializations and
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//! used to reconstruct snapshot-based chainstates.
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bool WriteSnapshotBaseBlockhash(Chainstate& snapshot_chainstate)
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EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
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//! Read the blockhash of the snapshot base block that was used to construct the
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//! chainstate.
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std::optional<uint256> ReadSnapshotBaseBlockhash(fs::path chaindir)
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EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
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//! Suffix appended to the chainstate (leveldb) dir when created based upon
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//! a snapshot.
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constexpr std::string_view SNAPSHOT_CHAINSTATE_SUFFIX = "_snapshot";
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//! Return a path to the snapshot-based chainstate dir, if one exists.
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std::optional<fs::path> FindSnapshotChainstateDir();
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} // namespace node
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#endif // BITCOIN_NODE_UTXO_SNAPSHOT_H
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