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:
    ACK 92b2f5306b

Tree-SHA512: 200dff87767f157d627e99506ec543465d9329860a6cd49363081619c437163a640a46d008faa92b1f44fd403bfc7a7c9e851c658b5a4849efa9a34ca976bf31
This commit is contained in:
Wladimir J. van der Laan
2019-11-05 19:38:45 +01:00
9 changed files with 269 additions and 9 deletions

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@ -38,6 +38,7 @@ static void ApplyStats(CCoinsStats &stats, CHashWriter& ss, const uint256& hash,
//! Calculate statistics about the unspent transaction output set
bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats)
{
stats = CCoinsStats();
std::unique_ptr<CCoinsViewCursor> pcursor(view->Cursor());
assert(pcursor);
@ -61,6 +62,7 @@ bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats)
}
prevkey = key.hash;
outputs[key.n] = std::move(coin);
stats.coins_count++;
} else {
return error("%s: unable to read value", __func__);
}

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@ -15,16 +15,17 @@ class CCoinsView;
struct CCoinsStats
{
int nHeight;
uint256 hashBlock;
uint64_t nTransactions;
uint64_t nTransactionOutputs;
uint64_t nBogoSize;
uint256 hashSerialized;
uint64_t nDiskSize;
CAmount nTotalAmount;
int nHeight{0};
uint256 hashBlock{};
uint64_t nTransactions{0};
uint64_t nTransactionOutputs{0};
uint64_t nBogoSize{0};
uint256 hashSerialized{};
uint64_t nDiskSize{0};
CAmount nTotalAmount{0};
CCoinsStats() : nHeight(0), nTransactions(0), nTransactionOutputs(0), nBogoSize(0), nDiskSize(0), nTotalAmount(0) {}
//! The number of coins contained.
uint64_t coins_count{0};
};
//! Calculate statistics about the unspent transaction output set

50
src/node/utxo_snapshot.h Normal file
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@ -0,0 +1,50 @@
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_NODE_UTXO_SNAPSHOT_H
#define BITCOIN_NODE_UTXO_SNAPSHOT_H
#include <uint256.h>
#include <serialize.h>
//! Metadata describing a serialized version of a UTXO set from which an
//! assumeutxo CChainState can be constructed.
class SnapshotMetadata
{
public:
//! The hash of the block that reflects the tip of the chain for the
//! UTXO set contained in this snapshot.
uint256 m_base_blockhash;
//! The number of coins in the UTXO set contained in this snapshot. Used
//! during snapshot load to estimate progress of UTXO set reconstruction.
uint64_t m_coins_count = 0;
//! Necessary to "fake" the base nChainTx so that we can estimate progress during
//! initial block download for the assumeutxo chainstate.
unsigned int m_nchaintx = 0;
SnapshotMetadata() { }
SnapshotMetadata(
const uint256& base_blockhash,
uint64_t coins_count,
unsigned int nchaintx) :
m_base_blockhash(base_blockhash),
m_coins_count(coins_count),
m_nchaintx(nchaintx) { }
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action)
{
READWRITE(m_base_blockhash);
READWRITE(m_coins_count);
READWRITE(m_nchaintx);
}
};
#endif // BITCOIN_NODE_UTXO_SNAPSHOT_H