[net processing] Introduce PeerManagerInfo

For querying statistics/info from PeerManager. The median outbound time
offset is the only initial field.

Author: dergoegge

src/net_processing.cpp

@@ -518,6 +518,7 @@ class PeerManagerImpl final : public PeerManager
     std::optional<std::string> FetchBlock(NodeId peer_id, const CBlockIndex& block_index) override
         EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
+    PeerManagerInfo GetInfo() const override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     bool IgnoresIncomingTxs() override { return m_opts.ignore_incoming_txs; }
     void SendPings() override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     void RelayTransaction(const uint256& txid, const uint256& wtxid) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
@@ -1804,6 +1805,13 @@ bool PeerManagerImpl::GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) c
     return true;
 }
 
+PeerManagerInfo PeerManagerImpl::GetInfo() const
+{
+    return PeerManagerInfo{
+        .median_outbound_time_offset = m_outbound_time_offsets.Median(),
+    };
+}
+
 void PeerManagerImpl::AddToCompactExtraTransactions(const CTransactionRef& tx)
 {
     if (m_opts.max_extra_txs <= 0)

src/net_processing.h

@@ -46,6 +46,10 @@ struct CNodeStateStats {
     std::chrono::seconds time_offset{0};
 };
 
+struct PeerManagerInfo {
+    std::chrono::seconds median_outbound_time_offset{0s};
+};
+
 class PeerManager : public CValidationInterface, public NetEventsInterface
 {
 public:
@@ -86,6 +90,9 @@ class PeerManager : public CValidationInterface, public NetEventsInterface
     /** Get statistics from node state */
     virtual bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const = 0;
 
+    /** Get peer manager info. */
+    virtual PeerManagerInfo GetInfo() const = 0;
+
     /** Whether this node ignores txs received over p2p. */
     virtual bool IgnoresIncomingTxs() = 0;
 

src/rpc/net.cpp

@@ -23,7 +23,6 @@
 #include <rpc/server_util.h>
 #include <rpc/util.h>
 #include <sync.h>
-#include <timedata.h>
 #include <util/chaintype.h>
 #include <util/strencodings.h>
 #include <util/string.h>
@@ -679,9 +678,10 @@ static RPCHelpMan getnetworkinfo()
         obj.pushKV("localservicesnames", GetServicesNames(services));
     }
     if (node.peerman) {
+        auto peerman_info{node.peerman->GetInfo()};
         obj.pushKV("localrelay", !node.peerman->IgnoresIncomingTxs());
+        obj.pushKV("timeoffset", Ticks<std::chrono::seconds>(peerman_info.median_outbound_time_offset));
     }
-    obj.pushKV("timeoffset",    GetTimeOffset());
     if (node.connman) {
         obj.pushKV("networkactive", node.connman->GetNetworkActive());
         obj.pushKV("connections", node.connman->GetNodeCount(ConnectionDirection::Both));