From 707fde7b9ba522c22179e2db0ed7b462c65138d9 Mon Sep 17 00:00:00 2001
From: James O'Beirne <james.obeirne@gmail.com>
Date: Thu, 28 Mar 2019 12:08:32 -0400
Subject: [PATCH] add unused SnapshotMetadata class

---
 src/Makefile.am          |  1 +
 src/node/utxo_snapshot.h | 50 ++++++++++++++++++++++++++++++++++++++++
 src/validation.h         |  1 +
 3 files changed, 52 insertions(+)
 create mode 100644 src/node/utxo_snapshot.h

diff --git a/src/Makefile.am b/src/Makefile.am
index 3fb1a1f98..19d41b78c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -159,6 +159,7 @@ BITCOIN_CORE_H = \
   node/coinstats.h \
   node/psbt.h \
   node/transaction.h \
+  node/utxo_snapshot.h \
   noui.h \
   optional.h \
   outputtype.h \
diff --git a/src/node/utxo_snapshot.h b/src/node/utxo_snapshot.h
new file mode 100644
index 000000000..702a0cbe5
--- /dev/null
+++ b/src/node/utxo_snapshot.h
@@ -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
diff --git a/src/validation.h b/src/validation.h
index d17a320a4..a539ab546 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -21,6 +21,7 @@
 #include <txmempool.h> // For CTxMemPool::cs
 #include <txdb.h>
 #include <versionbits.h>
+#include <serialize.h>
 
 #include <algorithm>
 #include <atomic>