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Merge #16899: UTXO snapshot creation (dumptxoutset)
92b2f5306b
test: add dumptxoutset RPC test (James O'Beirne)c1ccbc3dde
devtools: add utxo_snapshot.sh (James O'Beirne)57cf74c991
rpc: add dumptxoutset (James O'Beirne)92fafb3a7d
coinstats: add coins_count (James O'Beirne)707fde7b9b
add unused SnapshotMetadata class (James O'Beirne) Pull request description: This is part of the [assumeutxo project](https://github.com/bitcoin/bitcoin/projects/11): Parent PR: #15606 Issue: #15605 Specification: https://github.com/jamesob/assumeutxo-docs/tree/master/proposal --- This changeset defines the serialization format for UTXO snapshots and adds an RPC command for creating them, `dumptxoutset`. It also adds a convenience script for generating and verifying snapshots at a certain height, since that requires doing a hacky rewind of the chain via `invalidateblock`. All of this is unused at the moment. ACKs for top commit: laanwj: ACK92b2f5306b
Tree-SHA512: 200dff87767f157d627e99506ec543465d9329860a6cd49363081619c437163a640a46d008faa92b1f44fd403bfc7a7c9e851c658b5a4849efa9a34ca976bf31
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@ -38,6 +38,7 @@ static void ApplyStats(CCoinsStats &stats, CHashWriter& ss, const uint256& hash,
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//! Calculate statistics about the unspent transaction output set
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bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats)
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{
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stats = CCoinsStats();
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std::unique_ptr<CCoinsViewCursor> pcursor(view->Cursor());
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assert(pcursor);
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@ -61,6 +62,7 @@ bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats)
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}
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prevkey = key.hash;
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outputs[key.n] = std::move(coin);
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stats.coins_count++;
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} else {
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return error("%s: unable to read value", __func__);
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}
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@ -15,16 +15,17 @@ class CCoinsView;
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struct CCoinsStats
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{
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int nHeight;
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uint256 hashBlock;
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uint64_t nTransactions;
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uint64_t nTransactionOutputs;
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uint64_t nBogoSize;
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uint256 hashSerialized;
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uint64_t nDiskSize;
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CAmount nTotalAmount;
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int nHeight{0};
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uint256 hashBlock{};
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uint64_t nTransactions{0};
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uint64_t nTransactionOutputs{0};
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uint64_t nBogoSize{0};
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uint256 hashSerialized{};
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uint64_t nDiskSize{0};
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CAmount nTotalAmount{0};
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CCoinsStats() : nHeight(0), nTransactions(0), nTransactionOutputs(0), nBogoSize(0), nDiskSize(0), nTotalAmount(0) {}
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//! The number of coins contained.
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uint64_t coins_count{0};
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};
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//! Calculate statistics about the unspent transaction output set
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50
src/node/utxo_snapshot.h
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50
src/node/utxo_snapshot.h
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@ -0,0 +1,50 @@
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// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2019 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 <uint256.h>
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#include <serialize.h>
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//! Metadata describing a serialized version of a UTXO set from which an
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//! assumeutxo CChainState 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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//! Necessary to "fake" the base nChainTx so that we can estimate progress during
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//! initial block download for the assumeutxo chainstate.
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unsigned int m_nchaintx = 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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m_nchaintx(nchaintx) { }
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ADD_SERIALIZE_METHODS;
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template <typename Stream, typename Operation>
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inline void SerializationOp(Stream& s, Operation ser_action)
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{
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READWRITE(m_base_blockhash);
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READWRITE(m_coins_count);
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READWRITE(m_nchaintx);
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}
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};
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#endif // BITCOIN_NODE_UTXO_SNAPSHOT_H
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