coinstats: Split node/coinstats.h to kernel/coinstats.h

Most of this commit is pure-move.

After this change:

- kernel/coinstats.h
    -> Contains declarations for:
       - enum class CoinStatsHashType
       - struct CCoinsStats
       - GetBogoSize(...)
       - TxOutSer(...)
       - ComputeUTXOStats(...)
- node/coinstats.h
    -> Just GetUTXOStats, which will be removed as we change callers to
       directly use the hashing/indexing codepaths in future commits.

2 files changed, 79 insertions, 1 deletions

diff --git a/src/kernel/coinstats.cpp b/src/kernel/coinstats.cpp
index 15d5c3fbe6..49db98d663 100644
--- a/src/kernel/coinstats.cpp
+++ b/src/kernel/coinstats.cpp
@@ -2,7 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <node/coinstats.h>
+#include <kernel/coinstats.h>
 
 #include <coins.h>
 #include <crypto/muhash.h>
diff --git a/src/kernel/coinstats.h b/src/kernel/coinstats.h
new file mode 100644
index 0000000000..d470ea715a
--- /dev/null
+++ b/src/kernel/coinstats.h
@@ -0,0 +1,78 @@
+// 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.
+
+#ifndef BITCOIN_KERNEL_COINSTATS_H
+#define BITCOIN_KERNEL_COINSTATS_H
+
+#include <chain.h>
+#include <coins.h>
+#include <consensus/amount.h>
+#include <streams.h>
+#include <uint256.h>
+
+#include <cstdint>
+#include <functional>
+
+class CCoinsView;
+namespace node {
+class BlockManager;
+} // namespace node
+
+namespace node {
+enum class CoinStatsHashType {
+    HASH_SERIALIZED,
+    MUHASH,
+    NONE,
+};
+
+struct CCoinsStats {
+    int nHeight{0};
+    uint256 hashBlock{};
+    uint64_t nTransactions{0};
+    uint64_t nTransactionOutputs{0};
+    uint64_t nBogoSize{0};
+    uint256 hashSerialized{};
+    uint64_t nDiskSize{0};
+    //! The total amount, or nullopt if an overflow occurred calculating it
+    std::optional<CAmount> total_amount{0};
+
+    //! The number of coins contained.
+    uint64_t coins_count{0};
+
+    //! Signals if the coinstatsindex was used to retrieve the statistics.
+    bool index_used{false};
+
+    // Following values are only available from coinstats index
+
+    //! Total cumulative amount of block subsidies up to and including this block
+    CAmount total_subsidy{0};
+    //! Total cumulative amount of unspendable coins up to and including this block
+    CAmount total_unspendable_amount{0};
+    //! Total cumulative amount of prevouts spent up to and including this block
+    CAmount total_prevout_spent_amount{0};
+    //! Total cumulative amount of outputs created up to and including this block
+    CAmount total_new_outputs_ex_coinbase_amount{0};
+    //! Total cumulative amount of coinbase outputs up to and including this block
+    CAmount total_coinbase_amount{0};
+    //! The unspendable coinbase amount from the genesis block
+    CAmount total_unspendables_genesis_block{0};
+    //! The two unspendable coinbase outputs total amount caused by BIP30
+    CAmount total_unspendables_bip30{0};
+    //! Total cumulative amount of outputs sent to unspendable scripts (OP_RETURN for example) up to and including this block
+    CAmount total_unspendables_scripts{0};
+    //! Total cumulative amount of coins lost due to unclaimed miner rewards up to and including this block
+    CAmount total_unspendables_unclaimed_rewards{0};
+
+    CCoinsStats() = default;
+    CCoinsStats(int block_height, const uint256& block_hash);
+};
+
+uint64_t GetBogoSize(const CScript& script_pub_key);
+
+CDataStream TxOutSer(const COutPoint& outpoint, const Coin& coin);
+
+std::optional<CCoinsStats> ComputeUTXOStats(CoinStatsHashType hash_type, CCoinsView* view, node::BlockManager& blockman, const std::function<void()>& interruption_point = {});
+} // namespace node
+
+#endif // BITCOIN_KERNEL_COINSTATS_H