Merge #6423: refactor: create helper function RelayRecoveredSig inside peerman

86e92c376a refactor: drop unused CConnman from CSigningManager (Konstantin Akimov)
4668db60a2 refactor: create helper function RelayRecoveredSig inside peerman (pasta)

Pull request description:

  ## Issue being fixed or feature implemented
  High m_nodes_mutex lock contention during high load

  ## What was done?
  this commit should have a few benefits:
  1. previous logic using ForEachNode results in locking m_nodes_mutex, a highly contended RecursiveMutex, AND m_peer_mutex(in GetPeerRef)
  2. prior also resulted in calling .find over the m_peer_map for each node. Basically old logic was (probably) O(n(nlogn) the new logic results in acquiring m_peer_mutex once and looping over the list of peers, (probably) O(n)
  3. Moves networking logic out of llmq/ and into actual net_processing.cpp

  ## How Has This Been Tested?
  Hasn't really yet; it builds, but I need to run tests / maybe deploy to testnet mn

  ## Breaking Changes

  ## Checklist:
    _Go over all the following points, and put an `x` in all the boxes that apply._
  - [ ] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  knst:
    utACK 86e92c376a
  UdjinM6:
    utACK 86e92c376a

Tree-SHA512: ca9d6ac22f8b72b117188147044c499ae62722283c6291633067b99726e6a6abc52e5c8cf3bdcd0d8fed0ad8d9086b000f628c9a932dfe89153e912b563eda5a

src/llmq/context.cpp

@@ -33,7 +33,7 @@ LLMQContext::LLMQContext(ChainstateManager& chainman, CConnman& connman, CDeterm
     qman{std::make_unique<llmq::CQuorumManager>(*bls_worker, chainman.ActiveChainstate(), connman, dmnman, *qdkgsman,
                                                 evo_db, *quorum_block_processor, mn_activeman, mn_sync, sporkman,
                                                 unit_tests, wipe)},
-    sigman{std::make_unique<llmq::CSigningManager>(connman, mn_activeman, chainman.ActiveChainstate(), *qman, peerman,
+    sigman{std::make_unique<llmq::CSigningManager>(mn_activeman, chainman.ActiveChainstate(), *qman, peerman,
                                                    unit_tests, wipe)},
     shareman{std::make_unique<llmq::CSigSharesManager>(connman, *sigman, mn_activeman, *qman, sporkman, peerman)},
     clhandler{[&]() -> llmq::CChainLocksHandler* const {

src/llmq/instantsend.h

@@ -22,6 +22,7 @@
 
 class CBlockIndex;
 class CChainState;
+class CConnman;
 class CDBWrapper;
 class CMasternodeSync;
 class CSporkManager;

src/llmq/signing.cpp

@@ -348,9 +348,9 @@ void CRecoveredSigsDb::CleanupOldVotes(int64_t maxAge)
 
 //////////////////
 
-CSigningManager::CSigningManager(CConnman& _connman, const CActiveMasternodeManager* const mn_activeman, const CChainState& chainstate,
+CSigningManager::CSigningManager(const CActiveMasternodeManager* const mn_activeman, const CChainState& chainstate,
                                  const CQuorumManager& _qman, const std::unique_ptr<PeerManager>& peerman, bool fMemory, bool fWipe) :
-    db(fMemory, fWipe), connman(_connman), m_mn_activeman(mn_activeman), m_chainstate(chainstate), qman(_qman), m_peerman(peerman)
+    db(fMemory, fWipe), m_mn_activeman(mn_activeman), m_chainstate(chainstate), qman(_qman), m_peerman(peerman)
 {
 }
 
@@ -633,12 +633,7 @@ void CSigningManager::ProcessRecoveredSig(const std::shared_ptr<const CRecovered
     WITH_LOCK(cs_pending, pendingReconstructedRecoveredSigs.erase(recoveredSig->GetHash()));
 
     if (m_mn_activeman != nullptr) {
-        CInv inv(MSG_QUORUM_RECOVERED_SIG, recoveredSig->GetHash());
-        connman.ForEachNode([&](const CNode* pnode) {
-            if (pnode->fSendRecSigs) {
-                Assert(m_peerman)->PushInventory(pnode->GetId(), inv);
-            }
-        });
+        Assert(m_peerman)->RelayRecoveredSig(recoveredSig->GetHash());
     }
 
     auto listeners = WITH_LOCK(cs_listeners, return recoveredSigsListeners);

src/llmq/signing.h

@@ -19,7 +19,6 @@
 
 class CActiveMasternodeManager;
 class CChainState;
-class CConnman;
 class CDataStream;
 class CDBBatch;
 class CDBWrapper;
@@ -160,7 +159,6 @@ class CSigningManager
 private:
 
     CRecoveredSigsDb db;
-    CConnman& connman;
     const CActiveMasternodeManager* const m_mn_activeman;
     const CChainState& m_chainstate;
     const CQuorumManager& qman;
@@ -179,7 +177,7 @@ private:
     std::vector<CRecoveredSigsListener*> recoveredSigsListeners GUARDED_BY(cs_listeners);
 
 public:
-    CSigningManager(CConnman& _connman, const CActiveMasternodeManager* const mn_activeman, const CChainState& chainstate,
+    CSigningManager(const CActiveMasternodeManager* const mn_activeman, const CChainState& chainstate,
                     const CQuorumManager& _qman, const std::unique_ptr<PeerManager>& peerman, bool fMemory, bool fWipe);
 
     bool AlreadyHave(const CInv& inv) const;

src/net.h

@@ -976,8 +976,6 @@ public:
     // If true, we will send him CoinJoin queue messages
     std::atomic<bool> fSendDSQueue{false};
 
-    // If true, we will announce/send him plain recovered sigs (usually true for full nodes)
-    std::atomic<bool> fSendRecSigs{false};
     // If true, we will send him all quorum related messages, even if he is not a member of our quorums
     std::atomic<bool> qwatch{false};
 

src/net_processing.cpp

@@ -271,6 +271,8 @@ struct Peer {
     std::atomic<std::chrono::microseconds> m_ping_start{0us};
     /** Whether a ping has been requested by the user */
     std::atomic<bool> m_ping_queued{false};
+    /** Whether the peer has requested to receive llmq recovered signatures */
+    std::atomic<bool> m_wants_recsigs{false};
 
     struct TxRelay {
         mutable RecursiveMutex m_bloom_filter_mutex;
@@ -607,6 +609,7 @@ public:
     void RelayInvFiltered(CInv &inv, const CTransaction &relatedTx, const int minProtoVersion) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     void RelayInvFiltered(CInv &inv, const uint256 &relatedTxHash, const int minProtoVersion) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     void RelayTransaction(const uint256& txid) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
+    void RelayRecoveredSig(const uint256& sigHash) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     void SetBestHeight(int height) override { m_best_height = height; };
     void Misbehaving(const NodeId pnode, const int howmuch, const std::string& message = "") override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     void ProcessMessage(CNode& pfrom, const std::string& msg_type, CDataStream& vRecv,
@@ -2339,6 +2342,17 @@ void PeerManagerImpl::RelayTransaction(const uint256& txid)
     };
 }
 
+void PeerManagerImpl::RelayRecoveredSig(const uint256& sigHash)
+{
+    const CInv inv{MSG_QUORUM_RECOVERED_SIG, sigHash};
+    LOCK(m_peer_mutex);
+    for (const auto& [_, peer] : m_peer_map) {
+        if (peer->m_wants_recsigs) {
+            PushInv(*peer, inv);
+        }
+    }
+}
+
 void PeerManagerImpl::RelayAddress(NodeId originator,
                                    const CAddress& addr,
                                    bool fReachable)
@@ -3948,7 +3962,7 @@ void PeerManagerImpl::ProcessMessage(
     if (msg_type == NetMsgType::QSENDRECSIGS) {
         bool b;
         vRecv >> b;
-        pfrom.fSendRecSigs = b;
+        peer->m_wants_recsigs = b;
         return;
     }
 

src/net_processing.h

@@ -109,6 +109,9 @@ public:
     virtual void RelayTransaction(const uint256& txid)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main) = 0;
 
+    /** Relay recovered sigs to all interested peers */
+    virtual void RelayRecoveredSig(const uint256& sigHash) = 0;
+
     /** Set the best height */
     virtual void SetBestHeight(int height) = 0;