fix: fetch orphan-vote parents via the request tracker instead of broadcasting #7526
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| Original file line number | Diff line number | Diff line change |
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@@ -45,23 +45,9 @@ void NetGovernance::Schedule(CScheduler& scheduler) | |
| [this]() -> void { | ||
| if (!m_node_sync.IsSynced()) return; | ||
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| // CHECK AND REMOVE - REPROCESS GOVERNANCE OBJECTS | ||
| // Also expires orphan votes whose parent object never arrived. Fetching those parents | ||
| // is driven by the object request tracker from ProcessMessage(), not from here. | ||
| m_gov_manager.CheckAndRemove(); | ||
| }, | ||
| std::chrono::minutes{5}); | ||
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@@ -262,11 +248,13 @@ void NetGovernance::ProcessMessage(CNode& peer, const std::string& msg_type, CDa | |
| // m_peer_manager->PeerRelayInv(CInv{MSG_GOVERNANCE_OBJECT_VOTE, nHash}); | ||
| } else { | ||
| LogPrint(BCLog::GOBJECT, "MNGOVERNANCEOBJECTVOTE -- Rejected vote, error = %s\n", exception.what()); | ||
| if (!hashToRequest.IsNull()) { | ||
|
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When the same orphan vote is later received from a second peer—particularly after the first peer's parent request timed out— AGENTS.md reference: AGENTS.md:L165-L175 Useful? React with 👍 / 👎. |
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| // Orphan vote: fetch the parent object through the request tracker, which owns | ||
| // GETDATA scheduling, per-peer in-flight limits, expiry and fallback to another | ||
| // peer. Ask this peer first -- holding a vote for the object is evidence it has | ||
| // the object, and it may never have announced the object to us. | ||
| m_peer_manager->PeerAskPeersForObject(CInv{MSG_GOVERNANCE_OBJECT, hashToRequest}, | ||
| peer.GetId()); | ||
| } | ||
| if ((exception.GetNodePenalty() != 0) && m_node_sync.IsSynced()) { | ||
| m_peer_manager->PeerMisbehaving(peer.GetId(), exception.GetNodePenalty()); | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -85,6 +85,10 @@ using node::fReindex; | |
| /** Maximum number of in-flight object requests from a peer. It is not a hard limit, but the | ||
| * threshold at which point the OVERLOADED_PEER_OBJECT_DELAY kicks in. */ | ||
| static constexpr int32_t MAX_PEER_OBJECT_REQUEST_IN_FLIGHT = 100; | ||
| /** How many peers to ask for an object we want but were never offered (see AskPeersForObject). | ||
| * Small on purpose: the request tracker retries and falls back to the next candidate on expiry, so | ||
| * this is the width of the initial attempt, not the number of chances to obtain the object. */ | ||
| static constexpr size_t MAX_PEERS_TO_ASK_FOR_OBJECT = 4; | ||
| /** Maximum number of announced objects from a peer. | ||
| * Unlike Bitcoin, this is not reduced to 5000: governance vote sync legitimately announces up to | ||
| * MAX_INV_SZ objects from a single peer (see CGovernanceManager). */ | ||
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@@ -644,15 +648,17 @@ class PeerManagerImpl final : public PeerManager | |
| void PeerRelayDSQ(const CCoinJoinQueue& queue) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex); | ||
| void PeerRelayTransaction(const uint256& txid) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex); | ||
| void PeerRelayRecoveredSig(const llmq::CRecoveredSig& sig, bool proactive_relay) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex); | ||
| void PeerAskPeersForObject(const CInv& inv, NodeId prefer_first) override | ||
| EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, !cs_main); | ||
| size_t PeerGetRequestedObjectCount(NodeId nodeid) const override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, ::cs_main); | ||
| void PeerPostProcessMessage(MessageProcessingResult&& ret) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex); | ||
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| private: | ||
| void _RelayTransaction(const uint256& txid) EXCLUSIVE_LOCKS_REQUIRED(cs_main, !m_peer_mutex); | ||
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| /** Ask peers that have the object in their inventory to relay it to us, plus prefer_first. */ | ||
| void AskPeersForObject(const CInv& inv, NodeId prefer_first) | ||
| EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, !cs_main); | ||
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| /** Relay inventories to peers that find it relevant */ | ||
| void RelayInvFiltered(const CInv& inv, const CTransaction& relatedTx) EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex); | ||
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@@ -2387,43 +2393,63 @@ void PeerManagerImpl::SendPings() | |
| for(auto& it : m_peer_map) it.second->m_ping_queued = true; | ||
| } | ||
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| void PeerManagerImpl::AskPeersForObject(const CInv& inv, NodeId prefer_first) | ||
| { | ||
| std::vector<PeerRef> peersToAsk; | ||
| peersToAsk.reserve(MAX_PEERS_TO_ASK_FOR_OBJECT); | ||
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| { | ||
| READ_LOCK(m_peer_mutex); | ||
| // A peer that holds the object without having announced it is not in any inventory filter, | ||
| // so it can only be reached by being named. Ask it first: it is the one candidate we have | ||
| // positive evidence for. | ||
| if (prefer_first != -1) { | ||
| if (auto it = m_peer_map.find(prefer_first); it != m_peer_map.end()) { | ||
| peersToAsk.emplace_back(it->second); | ||
| } | ||
| } | ||
| // TODO consider prioritizing MNs again, once that flag is moved into Peer | ||
| for (const auto& [_, peer] : m_peer_map) { | ||
| if (peersToAsk.size() >= MAX_PEERS_TO_ASK_FOR_OBJECT) { | ||
| break; | ||
| } | ||
| if (peer->m_id == prefer_first) { | ||
| continue; | ||
| } | ||
| if (IsInvInFilter(*peer, inv.hash)) { | ||
| peersToAsk.emplace_back(peer); | ||
| } | ||
| } | ||
| } | ||
| { | ||
| LOCK(cs_main); | ||
| const auto current_time{GetTime<std::chrono::microseconds>()}; | ||
| // Register a fresh, preferred (undelayed) announcement from each peer we intend to ask, so | ||
| // the object is requested ASAP. We deliberately do not forget existing announcements for | ||
| // this hash: any live candidate/request from another peer must survive as a fallback, and | ||
| // there is nothing to "unstick" -- the tracker deletes a hash's COMPLETED announcements | ||
| // automatically once no live one remains, so a completed entry only lingers while some peer | ||
| // is still being tried. If a peer here already has an announcement, ReceivedInv is a no-op | ||
| // and the existing one (in flight or queued) keeps its place. | ||
| for (PeerRef& peer : peersToAsk) { | ||
| // The peer may have been disconnected (and its tracker state wiped by DisconnectedPeer) | ||
| // after we collected it above but before we took cs_main. Registering an announcement | ||
| // for a gone peer would leave a candidate that is never requested and could block the | ||
| // live fallback peers, so skip it. | ||
| if (State(peer->m_id) == nullptr) continue; | ||
| // Obey the same per-peer accounting AddObjectAnnouncement applies to announcements the | ||
| // peer sent us. A synthetic announcement is still an entry the peer's behaviour can | ||
| // cause us to create -- a peer that keeps naming objects we do not have would otherwise | ||
| // grow its tracker footprint without limit. | ||
| if (m_object_request.Count(peer->m_id) >= MAX_PEER_OBJECT_ANNOUNCEMENTS) continue; | ||
| const bool overloaded = m_object_request.CountInFlight(peer->m_id) >= MAX_PEER_OBJECT_REQUEST_IN_FLIGHT; | ||
| LogPrint(BCLog::NET, "PeerManagerImpl::%s -- %s: asking peer %d\n", __func__, inv.ToString(), | ||
| peer->m_id); | ||
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| // Preferred and otherwise undelayed: unlike a peer-initiated announcement, we asked for | ||
| // this one and want it as soon as the peer's in-flight budget allows. | ||
| m_object_request.ReceivedInv(peer->m_id, inv, /*preferred=*/true, | ||
|
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When another peer's inventory filter also contains this hash, every candidate is registered with AGENTS.md reference: AGENTS.md:L165-L175 Useful? React with 👍 / 👎. |
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| current_time + (overloaded ? OVERLOADED_PEER_OBJECT_DELAY : 0us)); | ||
| } | ||
| } | ||
| } | ||
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There was a problem hiding this comment. 🎯 Functional Correctness | 🟠 Major | ⚡ Quick win 🧩 Analysis chain🏁 Script executed: #!/bin/bash
# Description: Inspect IsInvInFilter's implementation to determine whether it is
# scoped to the tx-specific known-inventory filter or generalizes across CInv types.
ast-grep run --pattern 'bool PeerManagerImpl::IsInvInFilter($$$) {
$$$
}' --lang cpp src/net_processing.cpp
rg -n -B2 -A15 'bool PeerManagerImpl::IsInvInFilter' src/net_processing.cppRepository: dashpay/dash Length of output: 761 🏁 Script executed: #!/bin/bash
set -euo pipefail
echo "== declarations =="
rg -n -B3 -A5 'IsInvInFilter|AskPeersForObject|PeerAskPeersForObject|m_object_request.*RequestedInv|m_object_request.*ReceivedInv|m_tx_inventory_known_filter|TxRelay' src/net_processing.cpp src/net_processing.h src/net.h src/net.h-common.h 2>/dev/null | head -n 240
echo
echo "== call sites with surrounding context =="
rg -n -B6 -A8 'AskPeersForObject\(|PeerAskPeersForObject\(' src test -g '*.cpp' -g '*.h' -g '*.c' -g '*.cc' | head -n 240
echo
echo "== CInv enum usage relevant to object inventory =="
rg -n 'MSG_[A-Z_]+|SendTransaction|PushInventory|Inventory|TxFrom|TxTo|m_tx_inventory_known_filter\.insert|\.add\(' src/net_processing.cpp src/validation.cpp src/policy | sed -n '1,220p'Repository: dashpay/dash Length of output: 15683 🏁 Script executed: #!/bin/bash
set -euo pipefail
echo "== declaration and relevant declarations =="
rg -n -B4 -A8 'IsInvInFilter|AskPeersForObject|PeerAskPeersForObject|m_object_request|TxRelay|m_tx_inventory_known_filter' src/net_processing.cpp src/net_processing.h src/net.h src/net.h-common.h 2>/dev/null | sed -n '1,260p'Repository: dashpay/dash Length of output: 19362 Scope
🤖 Prompt for AI Agents |
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@@ -6782,9 +6808,9 @@ void PeerManagerImpl::PeerRelayTransaction(const uint256& txid) | |
| RelayTransaction(txid); | ||
| } | ||
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| void PeerManagerImpl::PeerAskPeersForObject(const CInv& inv, NodeId prefer_first) | ||
| { | ||
| AskPeersForObject(inv, prefer_first); | ||
| } | ||
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| size_t PeerManagerImpl::PeerGetRequestedObjectCount(NodeId nodeid) const | ||
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On upgrades that load an existing
governance.dat, this constructor limit is overwritten whenCacheMultiMap::Unserializerestores its serializednMaxSize. Because the serialization version remainsCGovernanceManager-Version-16, existing files contain the old 1,000,000-entry limit, so nearly every upgraded node continues accepting that many orphan votes despite this change. EnforceMAX_ORPHAN_VOTESafter loading, including pruning any excess retained entries, rather than relying only on the constructor.AGENTS.md reference: AGENTS.md:L166-L175
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