Merge bitcoin/bitcoin#23785: refactor: Move stuff to ChainstateManager

fab6d6b2d154893ab422dda87f3535d42c3e06f4 Move pindexBestInvalid to ChainstateManager (MarcoFalke)
facd2137eceacb95e1f71c87ddc704d752b37272 Move m_failed_blocks to ChainstateManager (MarcoFalke)
fa47b5c100f81c65c15b5a6afaf6c91bc0861264 Move AcceptBlockHeader to ChainstateManager (MarcoFalke)
fa3d62cf7b3501a056b34c5458c14d2fe6a55bd7 Move FindForkInGlobalIndex from BlockManager to CChainState (MarcoFalke)

Pull request description:

  Move globals or members of the wrong class to the right class.

ACKs for top commit:
  naumenkogs:
    ACK fab6d6b2d154893ab422dda87f3535d42c3e06f4
  Sjors:
    ACK fab6d6b2d154893ab422dda87f3535d42c3e06f4
  shaavan:
    ACK fab6d6b2d154893ab422dda87f3535d42c3e06f4

Tree-SHA512: 926cbdfa22838517497bacb79ed5f521f64117c2aacf96a0176f62831b4713314a32abc0213df5ee067edf63e4a4300f752a26006d36e5aab415bb91209a271f

5 files changed, 77 insertions, 74 deletions

diff --git a/src/index/base.cpp b/src/index/base.cpp
index 24c289ed51..9d5c68d69e 100644
--- a/src/index/base.cpp
+++ b/src/index/base.cpp
@@ -65,7 +65,7 @@ bool BaseIndex::Init()
     if (locator.IsNull()) {
         m_best_block_index = nullptr;
     } else {
-        m_best_block_index = m_chainstate->m_blockman.FindForkInGlobalIndex(active_chain, locator);
+        m_best_block_index = m_chainstate->FindForkInGlobalIndex(locator);
     }
     m_synced = m_best_block_index.load() == active_chain.Tip();
     if (!m_synced) {
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 2a30afdb5b..d4f0e94056 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -3083,7 +3083,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         LOCK(cs_main);
 
         // Find the last block the caller has in the main chain
-        const CBlockIndex* pindex = m_chainman.m_blockman.FindForkInGlobalIndex(m_chainman.ActiveChain(), locator);
+        const CBlockIndex* pindex = m_chainman.ActiveChainstate().FindForkInGlobalIndex(locator);
 
         // Send the rest of the chain
         if (pindex)
@@ -3203,7 +3203,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         else
         {
             // Find the last block the caller has in the main chain
-            pindex = m_chainman.m_blockman.FindForkInGlobalIndex(m_chainman.ActiveChain(), locator);
+            pindex = m_chainman.ActiveChainstate().FindForkInGlobalIndex(locator);
             if (pindex)
                 pindex = m_chainman.ActiveChain().Next(pindex);
         }
diff --git a/src/node/interfaces.cpp b/src/node/interfaces.cpp
index 075842ef73..8109dce2c0 100644
--- a/src/node/interfaces.cpp
+++ b/src/node/interfaces.cpp
@@ -494,8 +494,8 @@ public:
     std::optional<int> findLocatorFork(const CBlockLocator& locator) override
     {
         LOCK(cs_main);
-        const CChain& active = Assert(m_node.chainman)->ActiveChain();
-        if (CBlockIndex* fork = m_node.chainman->m_blockman.FindForkInGlobalIndex(active, locator)) {
+        const CChainState& active = Assert(m_node.chainman)->ActiveChainstate();
+        if (CBlockIndex* fork = active.FindForkInGlobalIndex(locator)) {
             return fork->nHeight;
         }
         return std::nullopt;
diff --git a/src/validation.cpp b/src/validation.cpp
index 446c21e118..c521e9b634 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -133,11 +133,6 @@ arith_uint256 nMinimumChainWork;
 
 CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE);
 
-// Internal stuff
-namespace {
-    CBlockIndex* pindexBestInvalid = nullptr;
-} // namespace
-
 // Internal stuff from blockstorage ...
 extern RecursiveMutex cs_LastBlockFile;
 extern std::vector<CBlockFileInfo> vinfoBlockFile;
@@ -155,23 +150,24 @@ CBlockIndex* BlockManager::LookupBlockIndex(const uint256& hash) const
     return it == m_block_index.end() ? nullptr : it->second;
 }
 
-CBlockIndex* BlockManager::FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& locator)
+CBlockIndex* CChainState::FindForkInGlobalIndex(const CBlockLocator& locator) const
 {
     AssertLockHeld(cs_main);
 
     // Find the latest block common to locator and chain - we expect that
     // locator.vHave is sorted descending by height.
     for (const uint256& hash : locator.vHave) {
-        CBlockIndex* pindex = LookupBlockIndex(hash);
+        CBlockIndex* pindex{m_blockman.LookupBlockIndex(hash)};
         if (pindex) {
-            if (chain.Contains(pindex))
+            if (m_chain.Contains(pindex)) {
                 return pindex;
-            if (pindex->GetAncestor(chain.Height()) == chain.Tip()) {
-                return chain.Tip();
+            }
+            if (pindex->GetAncestor(m_chain.Height()) == m_chain.Tip()) {
+                return m_chain.Tip();
             }
         }
     }
-    return chain.Genesis();
+    return m_chain.Genesis();
 }
 
 bool CheckInputScripts(const CTransaction& tx, TxValidationState& state,
@@ -1478,7 +1474,7 @@ void CChainState::CheckForkWarningConditions()
         return;
     }
 
-    if (pindexBestInvalid && pindexBestInvalid->nChainWork > m_chain.Tip()->nChainWork + (GetBlockProof(*m_chain.Tip()) * 6)) {
+    if (m_chainman.m_best_invalid && m_chainman.m_best_invalid->nChainWork > m_chain.Tip()->nChainWork + (GetBlockProof(*m_chain.Tip()) * 6)) {
         LogPrintf("%s: Warning: Found invalid chain at least ~6 blocks longer than our best chain.\nChain state database corruption likely.\n", __func__);
         SetfLargeWorkInvalidChainFound(true);
     } else {
@@ -1489,8 +1485,9 @@ void CChainState::CheckForkWarningConditions()
 // Called both upon regular invalid block discovery *and* InvalidateBlock
 void CChainState::InvalidChainFound(CBlockIndex* pindexNew)
 {
-    if (!pindexBestInvalid || pindexNew->nChainWork > pindexBestInvalid->nChainWork)
-        pindexBestInvalid = pindexNew;
+    if (!m_chainman.m_best_invalid || pindexNew->nChainWork > m_chainman.m_best_invalid->nChainWork) {
+        m_chainman.m_best_invalid = pindexNew;
+    }
     if (pindexBestHeader != nullptr && pindexBestHeader->GetAncestor(pindexNew->nHeight) == pindexNew) {
         pindexBestHeader = m_chain.Tip();
     }
@@ -1512,7 +1509,7 @@ void CChainState::InvalidBlockFound(CBlockIndex* pindex, const BlockValidationSt
 {
     if (state.GetResult() != BlockValidationResult::BLOCK_MUTATED) {
         pindex->nStatus |= BLOCK_FAILED_VALID;
-        m_blockman.m_failed_blocks.insert(pindex);
+        m_chainman.m_failed_blocks.insert(pindex);
         setDirtyBlockIndex.insert(pindex);
         setBlockIndexCandidates.erase(pindex);
         InvalidChainFound(pindex);
@@ -2653,8 +2650,9 @@ CBlockIndex* CChainState::FindMostWorkChain() {
             bool fMissingData = !(pindexTest->nStatus & BLOCK_HAVE_DATA);
             if (fFailedChain || fMissingData) {
                 // Candidate chain is not usable (either invalid or missing data)
-                if (fFailedChain && (pindexBestInvalid == nullptr || pindexNew->nChainWork > pindexBestInvalid->nChainWork))
-                    pindexBestInvalid = pindexNew;
+                if (fFailedChain && (m_chainman.m_best_invalid == nullptr || pindexNew->nChainWork > m_chainman.m_best_invalid->nChainWork)) {
+                    m_chainman.m_best_invalid = pindexNew;
+                }
                 CBlockIndex *pindexFailed = pindexNew;
                 // Remove the entire chain from the set.
                 while (pindexTest != pindexFailed) {
@@ -3065,7 +3063,7 @@ bool CChainState::InvalidateBlock(BlockValidationState& state, CBlockIndex* pind
         to_mark_failed->nStatus |= BLOCK_FAILED_VALID;
         setDirtyBlockIndex.insert(to_mark_failed);
         setBlockIndexCandidates.erase(to_mark_failed);
-        m_blockman.m_failed_blocks.insert(to_mark_failed);
+        m_chainman.m_failed_blocks.insert(to_mark_failed);
 
         // If any new blocks somehow arrived while we were disconnecting
         // (above), then the pre-calculation of what should go into
@@ -3106,11 +3104,11 @@ void CChainState::ResetBlockFailureFlags(CBlockIndex *pindex) {
             if (it->second->IsValid(BLOCK_VALID_TRANSACTIONS) && it->second->HaveTxsDownloaded() && setBlockIndexCandidates.value_comp()(m_chain.Tip(), it->second)) {
                 setBlockIndexCandidates.insert(it->second);
             }
-            if (it->second == pindexBestInvalid) {
+            if (it->second == m_chainman.m_best_invalid) {
                 // Reset invalid block marker if it was pointing to one of those.
-                pindexBestInvalid = nullptr;
+                m_chainman.m_best_invalid = nullptr;
             }
-            m_blockman.m_failed_blocks.erase(it->second);
+            m_chainman.m_failed_blocks.erase(it->second);
         }
         it++;
     }
@@ -3120,7 +3118,7 @@ void CChainState::ResetBlockFailureFlags(CBlockIndex *pindex) {
         if (pindex->nStatus & BLOCK_FAILED_MASK) {
             pindex->nStatus &= ~BLOCK_FAILED_MASK;
             setDirtyBlockIndex.insert(pindex);
-            m_blockman.m_failed_blocks.erase(pindex);
+            m_chainman.m_failed_blocks.erase(pindex);
         }
         pindex = pindex->pprev;
     }
@@ -3481,14 +3479,14 @@ static bool ContextualCheckBlock(const CBlock& block, BlockValidationState& stat
     return true;
 }
 
-bool BlockManager::AcceptBlockHeader(const CBlockHeader& block, BlockValidationState& state, const CChainParams& chainparams, CBlockIndex** ppindex)
+bool ChainstateManager::AcceptBlockHeader(const CBlockHeader& block, BlockValidationState& state, const CChainParams& chainparams, CBlockIndex** ppindex)
 {
     AssertLockHeld(cs_main);
     // Check for duplicate
     uint256 hash = block.GetHash();
-    BlockMap::iterator miSelf = m_block_index.find(hash);
+    BlockMap::iterator miSelf{m_blockman.m_block_index.find(hash)};
     if (hash != chainparams.GetConsensus().hashGenesisBlock) {
-        if (miSelf != m_block_index.end()) {
+        if (miSelf != m_blockman.m_block_index.end()) {
             // Block header is already known.
             CBlockIndex* pindex = miSelf->second;
             if (ppindex)
@@ -3507,8 +3505,8 @@ bool BlockManager::AcceptBlockHeader(const CBlockHeader& block, BlockValidationS
 
         // Get prev block index
         CBlockIndex* pindexPrev = nullptr;
-        BlockMap::iterator mi = m_block_index.find(block.hashPrevBlock);
-        if (mi == m_block_index.end()) {
+        BlockMap::iterator mi{m_blockman.m_block_index.find(block.hashPrevBlock)};
+        if (mi == m_blockman.m_block_index.end()) {
             LogPrint(BCLog::VALIDATION, "%s: %s prev block not found\n", __func__, hash.ToString());
             return state.Invalid(BlockValidationResult::BLOCK_MISSING_PREV, "prev-blk-not-found");
         }
@@ -3517,7 +3515,7 @@ bool BlockManager::AcceptBlockHeader(const CBlockHeader& block, BlockValidationS
             LogPrint(BCLog::VALIDATION, "%s: %s prev block invalid\n", __func__, hash.ToString());
             return state.Invalid(BlockValidationResult::BLOCK_INVALID_PREV, "bad-prevblk");
         }
-        if (!ContextualCheckBlockHeader(block, state, *this, chainparams, pindexPrev, GetAdjustedTime())) {
+        if (!ContextualCheckBlockHeader(block, state, m_blockman, chainparams, pindexPrev, GetAdjustedTime())) {
             LogPrint(BCLog::VALIDATION, "%s: Consensus::ContextualCheckBlockHeader: %s, %s\n", __func__, hash.ToString(), state.ToString());
             return false;
         }
@@ -3561,7 +3559,7 @@ bool BlockManager::AcceptBlockHeader(const CBlockHeader& block, BlockValidationS
             }
         }
     }
-    CBlockIndex* pindex = AddToBlockIndex(block);
+    CBlockIndex* pindex{m_blockman.AddToBlockIndex(block)};
 
     if (ppindex)
         *ppindex = pindex;
@@ -3577,8 +3575,7 @@ bool ChainstateManager::ProcessNewBlockHeaders(const std::vector<CBlockHeader>&
         LOCK(cs_main);
         for (const CBlockHeader& header : headers) {
             CBlockIndex *pindex = nullptr; // Use a temp pindex instead of ppindex to avoid a const_cast
-            bool accepted = m_blockman.AcceptBlockHeader(
-                header, state, chainparams, &pindex);
+            bool accepted{AcceptBlockHeader(header, state, chainparams, &pindex)};
             ActiveChainstate().CheckBlockIndex();
 
             if (!accepted) {
@@ -3608,7 +3605,7 @@ bool CChainState::AcceptBlock(const std::shared_ptr<const CBlock>& pblock, Block
     CBlockIndex *pindexDummy = nullptr;
     CBlockIndex *&pindex = ppindex ? *ppindex : pindexDummy;
 
-    bool accepted_header = m_blockman.AcceptBlockHeader(block, state, m_params, &pindex);
+    bool accepted_header{m_chainman.AcceptBlockHeader(block, state, m_params, &pindex)};
     CheckBlockIndex();
 
     if (!accepted_header)
@@ -4014,8 +4011,9 @@ bool BlockManager::LoadBlockIndex(
                 }
             }
         }
-        if (pindex->nStatus & BLOCK_FAILED_MASK && (!pindexBestInvalid || pindex->nChainWork > pindexBestInvalid->nChainWork))
-            pindexBestInvalid = pindex;
+        if (pindex->nStatus & BLOCK_FAILED_MASK && (!chainman.m_best_invalid || pindex->nChainWork > chainman.m_best_invalid->nChainWork)) {
+            chainman.m_best_invalid = pindex;
+        }
         if (pindex->pprev)
             pindex->BuildSkip();
         if (pindex->IsValid(BLOCK_VALID_TREE) && (pindexBestHeader == nullptr || CBlockIndexWorkComparator()(pindexBestHeader, pindex)))
@@ -4026,7 +4024,6 @@ bool BlockManager::LoadBlockIndex(
 }
 
 void BlockManager::Unload() {
-    m_failed_blocks.clear();
     m_blocks_unlinked.clear();
 
     for (const BlockMap::value_type& entry : m_block_index) {
@@ -4364,7 +4361,6 @@ void UnloadBlockIndex(CTxMemPool* mempool, ChainstateManager& chainman)
 {
     LOCK(cs_main);
     chainman.Unload();
-    pindexBestInvalid = nullptr;
     pindexBestHeader = nullptr;
     if (mempool) mempool->clear();
     vinfoBlockFile.clear();
@@ -5341,7 +5337,9 @@ void ChainstateManager::Unload()
         chainstate->UnloadBlockIndex();
     }
 
+    m_failed_blocks.clear();
     m_blockman.Unload();
+    m_best_invalid = nullptr;
 }
 
 void ChainstateManager::Reset()
diff --git a/src/validation.h b/src/validation.h
index ddfc8df939..160fffd048 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -421,26 +421,6 @@ private:
 public:
     BlockMap m_block_index GUARDED_BY(cs_main);
 
-    /** In order to efficiently track invalidity of headers, we keep the set of
-      * blocks which we tried to connect and found to be invalid here (ie which
-      * were set to BLOCK_FAILED_VALID since the last restart). We can then
-      * walk this set and check if a new header is a descendant of something in
-      * this set, preventing us from having to walk m_block_index when we try
-      * to connect a bad block and fail.
-      *
-      * While this is more complicated than marking everything which descends
-      * from an invalid block as invalid at the time we discover it to be
-      * invalid, doing so would require walking all of m_block_index to find all
-      * descendants. Since this case should be very rare, keeping track of all
-      * BLOCK_FAILED_VALID blocks in a set should be just fine and work just as
-      * well.
-      *
-      * Because we already walk m_block_index in height-order at startup, we go
-      * ahead and mark descendants of invalid blocks as FAILED_CHILD at that time,
-      * instead of putting things in this set.
-      */
-    std::set<CBlockIndex*> m_failed_blocks;
-
     /**
      * All pairs A->B, where A (or one of its ancestors) misses transactions, but B has transactions.
      * Pruned nodes may have entries where B is missing data.
@@ -470,21 +450,8 @@ public:
     //! Mark one block file as pruned (modify associated database entries)
     void PruneOneBlockFile(const int fileNumber) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
-    /**
-     * If a block header hasn't already been seen, call CheckBlockHeader on it, ensure
-     * that it doesn't descend from an invalid block, and then add it to m_block_index.
-     */
-    bool AcceptBlockHeader(
-        const CBlockHeader& block,
-        BlockValidationState& state,
-        const CChainParams& chainparams,
-        CBlockIndex** ppindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
-
     CBlockIndex* LookupBlockIndex(const uint256& hash) const EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
-    /** Find the last common block between the parameter chain and a locator. */
-    CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& locator) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
-
     //! Returns last CBlockIndex* that is a checkpoint
     CBlockIndex* GetLastCheckpoint(const CCheckpointData& data) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
@@ -772,6 +739,9 @@ public:
     /** Check whether we are doing an initial block download (synchronizing from disk or network) */
     bool IsInitialBlockDownload() const;
 
+    /** Find the last common block of this chain and a locator. */
+    CBlockIndex* FindForkInGlobalIndex(const CBlockLocator& locator) const EXCLUSIVE_LOCKS_REQUIRED(cs_main);
+
     /**
      * Make various assertions about the state of the block index.
      *
@@ -912,18 +882,53 @@ private:
     //! by the background validation chainstate.
     bool m_snapshot_validated{false};
 
+    CBlockIndex* m_best_invalid;
+    friend bool BlockManager::LoadBlockIndex(const Consensus::Params&, ChainstateManager&);
+
     //! Internal helper for ActivateSnapshot().
     [[nodiscard]] bool PopulateAndValidateSnapshot(
         CChainState& snapshot_chainstate,
         CAutoFile& coins_file,
         const SnapshotMetadata& metadata);
 
+    /**
+     * If a block header hasn't already been seen, call CheckBlockHeader on it, ensure
+     * that it doesn't descend from an invalid block, and then add it to m_block_index.
+     */
+    bool AcceptBlockHeader(
+        const CBlockHeader& block,
+        BlockValidationState& state,
+        const CChainParams& chainparams,
+        CBlockIndex** ppindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
+    friend CChainState;
+
 public:
     std::thread m_load_block;
     //! A single BlockManager instance is shared across each constructed
     //! chainstate to avoid duplicating block metadata.
     BlockManager m_blockman GUARDED_BY(::cs_main);
 
+    /**
+     * In order to efficiently track invalidity of headers, we keep the set of
+     * blocks which we tried to connect and found to be invalid here (ie which
+     * were set to BLOCK_FAILED_VALID since the last restart). We can then
+     * walk this set and check if a new header is a descendant of something in
+     * this set, preventing us from having to walk m_block_index when we try
+     * to connect a bad block and fail.
+     *
+     * While this is more complicated than marking everything which descends
+     * from an invalid block as invalid at the time we discover it to be
+     * invalid, doing so would require walking all of m_block_index to find all
+     * descendants. Since this case should be very rare, keeping track of all
+     * BLOCK_FAILED_VALID blocks in a set should be just fine and work just as
+     * well.
+     *
+     * Because we already walk m_block_index in height-order at startup, we go
+     * ahead and mark descendants of invalid blocks as FAILED_CHILD at that time,
+     * instead of putting things in this set.
+     */
+    std::set<CBlockIndex*> m_failed_blocks;
+
     //! The total number of bytes available for us to use across all in-memory
     //! coins caches. This will be split somehow across chainstates.
     int64_t m_total_coinstip_cache{0};