Method MaybeSendPing

src/net_processing.cpp:4457–4499

}

void PeerManagerImpl::MaybeSendPing(CNode& node_to, Peer& peer, std::chrono::microseconds now)
{
    if (m_connman.ShouldRunInactivityChecks(node_to, std::chrono::duration_cast<std::chrono::seconds>(now)) &&
        peer.m_ping_nonce_sent &&
        now > peer.m_ping_start.load() + TIMEOUT_INTERVAL)
    {
        // The ping timeout is using mocktime. To disable the check during
        // testing, increase -peertimeout.
        LogPrint(BCLog::NET, "ping timeout: %fs peer=%d\n", 0.000001 * count_microseconds(now - peer.m_ping_start.load()), peer.m_id);
        node_to.fDisconnect = true;
        return;
    }

    const CNetMsgMaker msgMaker(node_to.GetCommonVersion());
    bool pingSend = false;

    if (peer.m_ping_queued) {
        // RPC ping request by user
        pingSend = true;
    }

    if (peer.m_ping_nonce_sent == 0 && now > peer.m_ping_start.load() + PING_INTERVAL) {
        // Ping automatically sent as a latency probe & keepalive.
        pingSend = true;
    }

    if (pingSend) {
        uint64_t nonce = 0;
        while (nonce == 0) {
            GetRandBytes((unsigned char*)&nonce, sizeof(nonce));
        }
        peer.m_ping_queued = false;
        peer.m_ping_start = now;
        if (node_to.GetCommonVersion() > BIP0031_VERSION) {
            peer.m_ping_nonce_sent = nonce;
            m_connman.PushMessage(&node_to, msgMaker.Make(NetMsgType::PING, nonce));
        } else {
            // Peer is too old to support ping command with nonce, pong will never arrive.
            peer.m_ping_nonce_sent = 0;
            m_connman.PushMessage(&node_to, msgMaker.Make(NetMsgType::PING));
        }
    }
}

void PeerManagerImpl::MaybeSendAddr(CNode& node, Peer& peer, std::chrono::microseconds current_time)
{