refactoring: FlushStateToDisk -> CChainState

Also renames global methods for clarity:

- ::FlushStateToDisk() -> CChainState::ForceFlushStateToDisk()
  - This performs an unconditional flush.

- ::PruneAndFlush() -> CChainState::PruneAndFlush()

1 files changed, 16 insertions, 26 deletions

diff --git a/src/validation.cpp b/src/validation.cpp
index 279a7d0e09..6087260c6b 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -173,15 +173,7 @@ std::unique_ptr<CCoinsViewDB> pcoinsdbview;
 std::unique_ptr<CCoinsViewCache> pcoinsTip;
 std::unique_ptr<CBlockTreeDB> pblocktree;
 
-enum class FlushStateMode {
-    NONE,
-    IF_NEEDED,
-    PERIODIC,
-    ALWAYS
-};
-
 // See definition for documentation
-static bool FlushStateToDisk(const CChainParams& chainParams, CValidationState &state, FlushStateMode mode, int nManualPruneHeight=0);
 static void FindFilesToPruneManual(std::set<int>& setFilesToPrune, int nManualPruneHeight);
 static void FindFilesToPrune(std::set<int>& setFilesToPrune, uint64_t nPruneAfterHeight);
 bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsViewCache &inputs, bool fScriptChecks, unsigned int flags, bool cacheSigStore, bool cacheFullScriptStore, PrecomputedTransactionData& txdata, std::vector<CScriptCheck> *pvChecks = nullptr);
@@ -854,7 +846,7 @@ static bool AcceptToMemoryPoolWithTime(const CChainParams& chainparams, CTxMemPo
     }
     // After we've (potentially) uncached entries, ensure our coins cache is still within its size limits
     CValidationState stateDummy;
-    FlushStateToDisk(chainparams, stateDummy, FlushStateMode::PERIODIC);
+    ::ChainstateActive().FlushStateToDisk(chainparams, stateDummy, FlushStateMode::PERIODIC);
     return res;
 }
 
@@ -1951,16 +1943,12 @@ bool CChainState::ConnectBlock(const CBlock& block, CValidationState& state, CBl
     return true;
 }
 
-/**
- * Update the on-disk chain state.
- * The caches and indexes are flushed depending on the mode we're called with
- * if they're too large, if it's been a while since the last write,
- * or always and in all cases if we're in prune mode and are deleting files.
- *
- * If FlushStateMode::NONE is used, then FlushStateToDisk(...) won't do anything
- * besides checking if we need to prune.
- */
-bool static FlushStateToDisk(const CChainParams& chainparams, CValidationState &state, FlushStateMode mode, int nManualPruneHeight) {
+bool CChainState::FlushStateToDisk(
+    const CChainParams& chainparams,
+    CValidationState &state,
+    FlushStateMode mode,
+    int nManualPruneHeight)
+{
     int64_t nMempoolUsage = mempool.DynamicMemoryUsage();
     LOCK(cs_main);
     static int64_t nLastWrite = 0;
@@ -2058,7 +2046,7 @@ bool static FlushStateToDisk(const CChainParams& chainparams, CValidationState &
     }
     if (full_flush_completed) {
         // Update best block in wallet (so we can detect restored wallets).
-        GetMainSignals().ChainStateFlushed(::ChainActive().GetLocator());
+        GetMainSignals().ChainStateFlushed(m_chain.GetLocator());
     }
     } catch (const std::runtime_error& e) {
         return AbortNode(state, std::string("System error while flushing: ") + e.what());
@@ -2066,19 +2054,20 @@ bool static FlushStateToDisk(const CChainParams& chainparams, CValidationState &
     return true;
 }
 
-void FlushStateToDisk() {
+void CChainState::ForceFlushStateToDisk() {
     CValidationState state;
     const CChainParams& chainparams = Params();
-    if (!FlushStateToDisk(chainparams, state, FlushStateMode::ALWAYS)) {
+    if (!this->FlushStateToDisk(chainparams, state, FlushStateMode::ALWAYS)) {
         LogPrintf("%s: failed to flush state (%s)\n", __func__, FormatStateMessage(state));
     }
 }
 
-void PruneAndFlush() {
+void CChainState::PruneAndFlush() {
     CValidationState state;
     fCheckForPruning = true;
     const CChainParams& chainparams = Params();
-    if (!FlushStateToDisk(chainparams, state, FlushStateMode::NONE)) {
+
+    if (!this->FlushStateToDisk(chainparams, state, FlushStateMode::NONE)) {
         LogPrintf("%s: failed to flush state (%s)\n", __func__, FormatStateMessage(state));
     }
 }
@@ -3587,7 +3576,8 @@ void PruneBlockFilesManual(int nManualPruneHeight)
 {
     CValidationState state;
     const CChainParams& chainparams = Params();
-    if (!FlushStateToDisk(chainparams, state, FlushStateMode::NONE, nManualPruneHeight)) {
+    if (!::ChainstateActive().FlushStateToDisk(
+            chainparams, state, FlushStateMode::NONE, nManualPruneHeight)) {
         LogPrintf("%s: failed to flush state (%s)\n", __func__, FormatStateMessage(state));
     }
 }
@@ -4183,7 +4173,7 @@ bool RewindBlockIndex(const CChainParams& params) {
         // and skip it here, we're about to -reindex-chainstate anyway, so
         // it'll get called a bunch real soon.
         CValidationState state;
-        if (!FlushStateToDisk(params, state, FlushStateMode::ALWAYS)) {
+        if (!::ChainstateActive().FlushStateToDisk(params, state, FlushStateMode::ALWAYS)) {
             LogPrintf("RewindBlockIndex: unable to flush state to disk (%s)\n", FormatStateMessage(state));
             return false;
         }