scripted-diff: Move src/kernel/coinstats to kernel::

Introduces a new kernel:: namespace and move all of src/kernel/coinstats
under it.

In the verify script, lines like:

line="$(grep -n 'namespace node {' -- src/kernel/coinstats.h | tail -n1 | cut -d: -f1)"
sed -i -e "${line}s@namespace node {@namespace kernel {@" -- src/kernel/coinstats.h

Are intended to replace only the last instance of "namespace node" with
"namespace kernel", this is to avoid replacing forward declarations of
things inside the node:: namespace.

-BEGIN VERIFY SCRIPT-
sed -E -i 's@namespace node@namespace kernel@g' -- src/kernel/coinstats.cpp

line="$(grep -n 'namespace node {' -- src/kernel/coinstats.h | tail -n1 | cut -d: -f1)"
sed -i -e "${line}s@namespace node {@namespace kernel {@" -- src/kernel/coinstats.h

line="$(grep -n '// namespace node' -- src/kernel/coinstats.h | tail -n1 | cut -d: -f1)"
sed -i -e "${line}s@// namespace node@// namespace kernel@" -- src/kernel/coinstats.h

things='(CCoinsStats|CoinStatsHashType|GetBogoSize|TxOutSer|ComputeUTXOStats)'
git grep -lE 'node::'"$things" | xargs sed -E -i 's@node::'"$things"'@kernel::\1@g'
sed -E -i 's@'"$things"'@kernel::\1@g' -- src/node/coinstats.cpp src/node/coinstats.h
sed -E -i 's@BlockManager@node::\0@g' -- src/kernel/coinstats.cpp
-END VERIFY SCRIPT-

src/index/coinstatsindex.cpp

@@ -12,10 +12,10 @@
 #include <undo.h>
 #include <validation.h>
 
-using node::CCoinsStats;
-using node::GetBogoSize;
+using kernel::CCoinsStats;
+using kernel::GetBogoSize;
 using node::ReadBlockFromDisk;
-using node::TxOutSer;
+using kernel::TxOutSer;
 using node::UndoReadFromDisk;
 
 static constexpr uint8_t DB_BLOCK_HASH{'s'};

src/index/coinstatsindex.h

@@ -56,7 +56,7 @@ public:
     explicit CoinStatsIndex(size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
 
     // Look up stats for a specific block using CBlockIndex
-    std::optional<node::CCoinsStats> LookUpStats(const CBlockIndex* block_index) const;
+    std::optional<kernel::CCoinsStats> LookUpStats(const CBlockIndex* block_index) const;
 };
 
 /// The global UTXO set hash object.

src/kernel/coinstats.cpp

@@ -15,7 +15,7 @@
 
 #include <map>
 
-namespace node {
+namespace kernel {
 
 CCoinsStats::CCoinsStats(int block_height, const uint256& block_hash)
     : nHeight(block_height),
@@ -135,7 +135,7 @@ static bool ComputeUTXOStats(CCoinsView* view, CCoinsStats& stats, T hash_obj, c
     return true;
 }
 
-std::optional<CCoinsStats> ComputeUTXOStats(CoinStatsHashType hash_type, CCoinsView* view, BlockManager& blockman, const std::function<void()>& interruption_point)
+std::optional<CCoinsStats> ComputeUTXOStats(CoinStatsHashType hash_type, CCoinsView* view, node::BlockManager& blockman, const std::function<void()>& interruption_point)
 {
     CBlockIndex* pindex = WITH_LOCK(::cs_main, return blockman.LookupBlockIndex(view->GetBestBlock()));
     CCoinsStats stats{Assert(pindex)->nHeight, pindex->GetBlockHash()};
@@ -184,4 +184,4 @@ static void FinalizeHash(MuHash3072& muhash, CCoinsStats& stats)
 }
 static void FinalizeHash(std::nullptr_t, CCoinsStats& stats) {}
 
-} // namespace node
+} // namespace kernel

src/kernel/coinstats.h

@@ -19,7 +19,7 @@ namespace node {
 class BlockManager;
 } // namespace node
 
-namespace node {
+namespace kernel {
 enum class CoinStatsHashType {
     HASH_SERIALIZED,
     MUHASH,
@@ -73,6 +73,6 @@ 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
+} // namespace kernel
 
 #endif // BITCOIN_KERNEL_COINSTATS_H

src/node/coinstats.cpp

@@ -11,10 +11,10 @@
 #include <validation.h>
 
 namespace node {
-std::optional<CCoinsStats> GetUTXOStats(CCoinsView* view, BlockManager& blockman, CoinStatsHashType hash_type, const std::function<void()>& interruption_point, const CBlockIndex* pindex, bool index_requested)
+std::optional<kernel::CCoinsStats> GetUTXOStats(CCoinsView* view, BlockManager& blockman, kernel::CoinStatsHashType hash_type, const std::function<void()>& interruption_point, const CBlockIndex* pindex, bool index_requested)
 {
     // Use CoinStatsIndex if it is requested and available and a hash_type of Muhash or None was requested
-    if ((hash_type == CoinStatsHashType::MUHASH || hash_type == CoinStatsHashType::NONE) && g_coin_stats_index && index_requested) {
+    if ((hash_type == kernel::CoinStatsHashType::MUHASH || hash_type == kernel::CoinStatsHashType::NONE) && g_coin_stats_index && index_requested) {
         if (pindex) {
             return g_coin_stats_index->LookUpStats(pindex);
         } else {
@@ -29,6 +29,6 @@ std::optional<CCoinsStats> GetUTXOStats(CCoinsView* view, BlockManager& blockman
     // best block.
     assert(!pindex || pindex->GetBlockHash() == view->GetBestBlock());
 
-    return ComputeUTXOStats(hash_type, view, blockman, interruption_point);
+    return kernel::ComputeUTXOStats(hash_type, view, blockman, interruption_point);
 }
 } // namespace node

src/node/coinstats.h

@@ -28,8 +28,8 @@ namespace node {
  *
  * @param[in] index_requested Signals if the coinstatsindex should be used (when available).
  */
-std::optional<CCoinsStats> GetUTXOStats(CCoinsView* view, node::BlockManager& blockman,
-                                        CoinStatsHashType hash_type,
+std::optional<kernel::CCoinsStats> GetUTXOStats(CCoinsView* view, node::BlockManager& blockman,
+                                        kernel::CoinStatsHashType hash_type,
                                         const std::function<void()>& interruption_point = {},
                                         const CBlockIndex* pindex = nullptr,
                                         bool index_requested = true);

src/rpc/blockchain.cpp

@@ -52,8 +52,8 @@
 #include <mutex>
 
 using node::BlockManager;
-using node::CCoinsStats;
-using node::CoinStatsHashType;
+using kernel::CCoinsStats;
+using kernel::CoinStatsHashType;
 using node::GetUTXOStats;
 using node::NodeContext;
 using node::ReadBlockFromDisk;

src/test/coinstatsindex_tests.cpp

@@ -13,8 +13,8 @@
 
 #include <chrono>
 
-using node::CCoinsStats;
-using node::CoinStatsHashType;
+using kernel::CCoinsStats;
+using kernel::CoinStatsHashType;
 
 BOOST_AUTO_TEST_SUITE(coinstatsindex_tests)
 

src/validation.cpp

@@ -63,8 +63,8 @@ using node::BlockManager;
 using node::BlockMap;
 using node::CBlockIndexHeightOnlyComparator;
 using node::CBlockIndexWorkComparator;
-using node::CCoinsStats;
-using node::CoinStatsHashType;
+using kernel::CCoinsStats;
+using kernel::CoinStatsHashType;
 using node::fImporting;
 using node::fPruneMode;
 using node::fReindex;