//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2013 Ripple Labs Inc.

    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#include <ripple/app/consensus/RCLConsensus.h>
#include <ripple/app/consensus/RCLValidations.h>
#include <ripple/app/ledger/AcceptedLedger.h>
#include <ripple/app/ledger/InboundLedgers.h>
#include <ripple/app/ledger/LedgerMaster.h>
#include <ripple/app/ledger/LedgerToJson.h>
#include <ripple/app/ledger/LocalTxs.h>
#include <ripple/app/ledger/OpenLedger.h>
#include <ripple/app/ledger/OrderBookDB.h>
#include <ripple/app/ledger/TransactionMaster.h>
#include <ripple/app/main/LoadManager.h>
#include <ripple/app/misc/AmendmentTable.h>
#include <ripple/app/misc/HashRouter.h>
#include <ripple/app/misc/LoadFeeTrack.h>
#include <ripple/app/misc/NetworkOPs.h>
#include <ripple/app/misc/Transaction.h>
#include <ripple/app/misc/TxQ.h>
#include <ripple/app/misc/ValidatorKeys.h>
#include <ripple/app/misc/ValidatorList.h>
#include <ripple/app/misc/impl/AccountTxPaging.h>
#include <ripple/app/tx/apply.h>
#include <ripple/basics/PerfLog.h>
#include <ripple/basics/UptimeClock.h>
#include <ripple/basics/base64.h>
#include <ripple/basics/mulDiv.h>
#include <ripple/basics/safe_cast.h>
#include <ripple/beast/core/LexicalCast.h>
#include <ripple/beast/rfc2616.h>
#include <ripple/beast/utility/rngfill.h>
#include <ripple/consensus/Consensus.h>
#include <ripple/consensus/ConsensusParms.h>
#include <ripple/core/ConfigSections.h>
#include <ripple/crypto/RFC1751.h>
#include <ripple/crypto/csprng.h>
#include <ripple/json/to_string.h>
#include <ripple/overlay/Cluster.h>
#include <ripple/overlay/Overlay.h>
#include <ripple/overlay/predicates.h>
#include <ripple/protocol/BuildInfo.h>
#include <ripple/resource/ResourceManager.h>
#include <ripple/rpc/DeliveredAmount.h>
#include <boost/asio/ip/host_name.hpp>
#include <boost/asio/steady_timer.hpp>

#include <mutex>
#include <string>
#include <tuple>
#include <utility>

namespace ripple {

class NetworkOPsImp final : public NetworkOPs
{
    /**
     * Transaction with input flags and results to be applied in batches.
     */

    class TransactionStatus
    {
    public:
        std::shared_ptr<Transaction> const transaction;
        bool const admin;
        bool const local;
        FailHard const failType;
        bool applied;
        TER result;

        TransactionStatus(
            std::shared_ptr<Transaction> t,
            bool a,
            bool l,
            FailHard f)
            : transaction(t), admin(a), local(l), failType(f)
        {
            assert(local || failType == FailHard::no);
        }
    };

    /**
     * Synchronization states for transaction batches.
     */
    enum class DispatchState : unsigned char {
        none,
        scheduled,
        running,
    };

    static std::array<char const*, 5> const states_;

    /**
     * State accounting records two attributes for each possible server state:
     * 1) Amount of time spent in each state (in microseconds). This value is
     *    updated upon each state transition.
     * 2) Number of transitions to each state.
     *
     * This data can be polled through server_info and represented by
     * monitoring systems similarly to how bandwidth, CPU, and other
     * counter-based metrics are managed.
     *
     * State accounting is more accurate than periodic sampling of server
     * state. With periodic sampling, it is very likely that state transitions
     * are missed, and accuracy of time spent in each state is very rough.
     */
    class StateAccounting
    {
        struct Counters
        {
            explicit Counters() = default;

            std::uint32_t transitions = 0;
            std::chrono::microseconds dur = std::chrono::microseconds(0);
        };

        OperatingMode mode_ = OperatingMode::DISCONNECTED;
        std::array<Counters, 5> counters_;
        mutable std::mutex mutex_;
        std::chrono::system_clock::time_point start_ =
            std::chrono::system_clock::now();
        static std::array<Json::StaticString const, 5> const states_;
        static Json::StaticString const transitions_;
        static Json::StaticString const dur_;

    public:
        explicit StateAccounting()
        {
            counters_[static_cast<std::size_t>(OperatingMode::DISCONNECTED)]
                .transitions = 1;
        }

        /**
         * Record state transition. Update duration spent in previous
         * state.
         *
         * @param om New state.
         */
        void
        mode(OperatingMode om);

        /**
         * Json-formatted state accounting data.
         * 1st member: state accounting object.
         * 2nd member: duration in current state.
         */
        using StateCountersJson = std::pair<Json::Value, std::string>;

        /**
         * Output state counters in JSON format.
         *
         * @return JSON object.
         */
        StateCountersJson
        json() const;

        struct CounterData
        {
            decltype(counters_) counters;
            decltype(mode_) mode;
            decltype(start_) start;
        };

        CounterData
        getCounterData() const
        {
            std::lock_guard lock(mutex_);
            return {counters_, mode_, start_};
        }
    };

    //! Server fees published on `server` subscription
    struct ServerFeeSummary
    {
        ServerFeeSummary() = default;

        ServerFeeSummary(
            XRPAmount fee,
            TxQ::Metrics&& escalationMetrics,
            LoadFeeTrack const& loadFeeTrack);
        bool
        operator!=(ServerFeeSummary const& b) const;

        bool
        operator==(ServerFeeSummary const& b) const
        {
            return !(*this != b);
        }

        std::uint32_t loadFactorServer = 256;
        std::uint32_t loadBaseServer = 256;
        XRPAmount baseFee{10};
        boost::optional<TxQ::Metrics> em = boost::none;
    };

public:
    NetworkOPsImp(
        Application& app,
        NetworkOPs::clock_type& clock,
        bool standalone,
        std::size_t minPeerCount,
        bool start_valid,
        JobQueue& job_queue,
        LedgerMaster& ledgerMaster,
        Stoppable& parent,
        ValidatorKeys const& validatorKeys,
        boost::asio::io_service& io_svc,
        beast::Journal journal,
        beast::insight::Collector::ptr const& collector)
        : NetworkOPs(parent)
        , app_(app)
        , m_clock(clock)
        , m_journal(journal)
        , m_localTX(make_LocalTxs())
        , mMode(start_valid ? OperatingMode::FULL : OperatingMode::DISCONNECTED)
        , heartbeatTimer_(io_svc)
        , clusterTimer_(io_svc)
        , mConsensus(
              app,
              make_FeeVote(
                  setup_FeeVote(app_.config().section("voting")),
                  app_.logs().journal("FeeVote")),
              ledgerMaster,
              *m_localTX,
              app.getInboundTransactions(),
              beast::get_abstract_clock<std::chrono::steady_clock>(),
              validatorKeys,
              app_.logs().journal("LedgerConsensus"))
        , m_ledgerMaster(ledgerMaster)
        , m_job_queue(job_queue)
        , m_standalone(standalone)
        , minPeerCount_(start_valid ? 0 : minPeerCount)
        , m_stats(std::bind(&NetworkOPsImp::collect_metrics, this), collector)
    {
    }

    ~NetworkOPsImp() override
    {
        // This clear() is necessary to ensure the shared_ptrs in this map get
        // destroyed NOW because the objects in this map invoke methods on this
        // class when they are destroyed
        mRpcSubMap.clear();
    }

public:
    OperatingMode
    getOperatingMode() const override
    {
        return mMode;
    }

    std::string
    strOperatingMode(OperatingMode const mode, bool const admin) const override;

    std::string
    strOperatingMode(bool const admin = false) const override
    {
        return strOperatingMode(mMode, admin);
    }

    //
    // Transaction operations.
    //

    // Must complete immediately.
    void
    submitTransaction(std::shared_ptr<STTx const> const&) override;

    void
    processTransaction(
        std::shared_ptr<Transaction>& transaction,
        bool bUnlimited,
        bool bLocal,
        FailHard failType) override;

    /**
     * For transactions submitted directly by a client, apply batch of
     * transactions and wait for this transaction to complete.
     *
     * @param transaction Transaction object.
     * @param bUnliimited Whether a privileged client connection submitted it.
     * @param failType fail_hard setting from transaction submission.
     */
    void
    doTransactionSync(
        std::shared_ptr<Transaction> transaction,
        bool bUnlimited,
        FailHard failType);

    /**
     * For transactions not submitted by a locally connected client, fire and
     * forget. Add to batch and trigger it to be processed if there's no batch
     * currently being applied.
     *
     * @param transaction Transaction object
     * @param bUnlimited Whether a privileged client connection submitted it.
     * @param failType fail_hard setting from transaction submission.
     */
    void
    doTransactionAsync(
        std::shared_ptr<Transaction> transaction,
        bool bUnlimited,
        FailHard failtype);

    /**
     * Apply transactions in batches. Continue until none are queued.
     */
    void
    transactionBatch();

    /**
     * Attempt to apply transactions and post-process based on the results.
     *
     * @param Lock that protects the transaction batching
     */
    void
    apply(std::unique_lock<std::mutex>& batchLock);

    //
    // Owner functions.
    //

    Json::Value
    getOwnerInfo(
        std::shared_ptr<ReadView const> lpLedger,
        AccountID const& account) override;

    //
    // Book functions.
    //

    void
    getBookPage(
        std::shared_ptr<ReadView const>& lpLedger,
        Book const&,
        AccountID const& uTakerID,
        const bool bProof,
        unsigned int iLimit,
        Json::Value const& jvMarker,
        Json::Value& jvResult) override;

    // Ledger proposal/close functions.
    void
    processTrustedProposal(
        RCLCxPeerPos proposal,
        std::shared_ptr<protocol::TMProposeSet> set) override;

    bool
    recvValidation(
        std::shared_ptr<STValidation> const& val,
        std::string const& source) override;

    std::shared_ptr<SHAMap>
    getTXMap(uint256 const& hash);
    bool
    hasTXSet(
        const std::shared_ptr<Peer>& peer,
        uint256 const& set,
        protocol::TxSetStatus status);

    void
    mapComplete(std::shared_ptr<SHAMap> const& map, bool fromAcquire) override;

    // Network state machine.

    // Used for the "jump" case.
private:
    void
    switchLastClosedLedger(std::shared_ptr<Ledger const> const& newLCL);
    bool
    checkLastClosedLedger(const Overlay::PeerSequence&, uint256& networkClosed);

public:
    bool
    beginConsensus(uint256 const& networkClosed) override;
    void
    endConsensus() override;
    void
    setStandAlone() override
    {
        setMode(OperatingMode::FULL);
    }

    /** Called to initially start our timers.
        Not called for stand-alone mode.
    */
    void
    setStateTimer() override;

    void
    setNeedNetworkLedger() override
    {
        needNetworkLedger_ = true;
    }
    void
    clearNeedNetworkLedger() override
    {
        needNetworkLedger_ = false;
    }
    bool
    isNeedNetworkLedger() override
    {
        return needNetworkLedger_;
    }
    bool
    isFull() override
    {
        return !needNetworkLedger_ && (mMode == OperatingMode::FULL);
    }

    void
    setMode(OperatingMode om) override;

    bool
    isAmendmentBlocked() override
    {
        return amendmentBlocked_;
    }
    void
    setAmendmentBlocked() override;
    bool
    isAmendmentWarned() override
    {
        return !amendmentBlocked_ && amendmentWarned_;
    }
    void
    setAmendmentWarned() override
    {
        amendmentWarned_ = true;
    }
    void
    clearAmendmentWarned() override
    {
        amendmentWarned_ = false;
    }
    void
    consensusViewChange() override;

    Json::Value
    getConsensusInfo() override;
    Json::Value
    getServerInfo(bool human, bool admin, bool counters) override;
    void
    clearLedgerFetch() override;
    Json::Value
    getLedgerFetchInfo() override;
    std::uint32_t
    acceptLedger(
        boost::optional<std::chrono::milliseconds> consensusDelay) override;
    uint256
    getConsensusLCL() override;
    void
    reportFeeChange() override;
    void
    reportConsensusStateChange(ConsensusPhase phase);

    void
    updateLocalTx(ReadView const& view) override
    {
        m_localTX->sweep(view);
    }
    std::size_t
    getLocalTxCount() override
    {
        return m_localTX->size();
    }

    // Helper function to generate SQL query to get transactions.
    std::string
    transactionsSQL(
        std::string selection,
        AccountID const& account,
        std::int32_t minLedger,
        std::int32_t maxLedger,
        bool descending,
        std::uint32_t offset,
        int limit,
        bool binary,
        bool count,
        bool bUnlimited);

    // Client information retrieval functions.
    using NetworkOPs::AccountTxMarker;
    using NetworkOPs::AccountTxs;
    AccountTxs
    getAccountTxs(
        AccountID const& account,
        std::int32_t minLedger,
        std::int32_t maxLedger,
        bool descending,
        std::uint32_t offset,
        int limit,
        bool bUnlimited) override;

    AccountTxs
    getTxsAccount(
        AccountID const& account,
        std::int32_t minLedger,
        std::int32_t maxLedger,
        bool forward,
        std::optional<AccountTxMarker>& marker,
        int limit,
        bool bUnlimited) override;

    using NetworkOPs::MetaTxsList;
    using NetworkOPs::txnMetaLedgerType;

    MetaTxsList
    getAccountTxsB(
        AccountID const& account,
        std::int32_t minLedger,
        std::int32_t maxLedger,
        bool descending,
        std::uint32_t offset,
        int limit,
        bool bUnlimited) override;

    MetaTxsList
    getTxsAccountB(
        AccountID const& account,
        std::int32_t minLedger,
        std::int32_t maxLedger,
        bool forward,
        std::optional<AccountTxMarker>& marker,
        int limit,
        bool bUnlimited) override;

    //
    // Monitoring: publisher side.
    //
    void
    pubLedger(std::shared_ptr<ReadView const> const& lpAccepted) override;
    void
    pubProposedTransaction(
        std::shared_ptr<ReadView const> const& lpCurrent,
        std::shared_ptr<STTx const> const& stTxn,
        TER terResult) override;
    void
    pubValidation(std::shared_ptr<STValidation> const& val) override;

    //--------------------------------------------------------------------------
    //
    // InfoSub::Source.
    //
    void
    subAccount(
        InfoSub::ref ispListener,
        hash_set<AccountID> const& vnaAccountIDs,
        bool rt) override;
    void
    unsubAccount(
        InfoSub::ref ispListener,
        hash_set<AccountID> const& vnaAccountIDs,
        bool rt) override;

    // Just remove the subscription from the tracking
    // not from the InfoSub. Needed for InfoSub destruction
    void
    unsubAccountInternal(
        std::uint64_t seq,
        hash_set<AccountID> const& vnaAccountIDs,
        bool rt) override;

    bool
    subLedger(InfoSub::ref ispListener, Json::Value& jvResult) override;
    bool
    unsubLedger(std::uint64_t uListener) override;

    bool
    subServer(InfoSub::ref ispListener, Json::Value& jvResult, bool admin)
        override;
    bool
    unsubServer(std::uint64_t uListener) override;

    bool
    subBook(InfoSub::ref ispListener, Book const&) override;
    bool
    unsubBook(std::uint64_t uListener, Book const&) override;

    bool
    subManifests(InfoSub::ref ispListener) override;
    bool
    unsubManifests(std::uint64_t uListener) override;
    void
    pubManifest(Manifest const&) override;

    bool
    subTransactions(InfoSub::ref ispListener) override;
    bool
    unsubTransactions(std::uint64_t uListener) override;

    bool
    subRTTransactions(InfoSub::ref ispListener) override;
    bool
    unsubRTTransactions(std::uint64_t uListener) override;

    bool
    subValidations(InfoSub::ref ispListener) override;
    bool
    unsubValidations(std::uint64_t uListener) override;

    bool
    subPeerStatus(InfoSub::ref ispListener) override;
    bool
    unsubPeerStatus(std::uint64_t uListener) override;
    void
    pubPeerStatus(std::function<Json::Value(void)> const&) override;

    bool
    subConsensus(InfoSub::ref ispListener) override;
    bool
    unsubConsensus(std::uint64_t uListener) override;

    InfoSub::pointer
    findRpcSub(std::string const& strUrl) override;
    InfoSub::pointer
    addRpcSub(std::string const& strUrl, InfoSub::ref) override;
    bool
    tryRemoveRpcSub(std::string const& strUrl) override;

    //--------------------------------------------------------------------------
    //
    // Stoppable.

    void
    onStop() override
    {
        mAcquiringLedger.reset();
        {
            boost::system::error_code ec;
            heartbeatTimer_.cancel(ec);
            if (ec)
            {
                JLOG(m_journal.error())
                    << "NetworkOPs: heartbeatTimer cancel error: "
                    << ec.message();
            }

            ec.clear();
            clusterTimer_.cancel(ec);
            if (ec)
            {
                JLOG(m_journal.error())
                    << "NetworkOPs: clusterTimer cancel error: "
                    << ec.message();
            }
        }
        // Make sure that any waitHandlers pending in our timers are done
        // before we declare ourselves stopped.
        using namespace std::chrono_literals;
        waitHandlerCounter_.join("NetworkOPs", 1s, m_journal);
        stopped();
    }

private:
    void
    setHeartbeatTimer();
    void
    setClusterTimer();
    void
    processHeartbeatTimer();
    void
    processClusterTimer();

    Json::Value
    transJson(
        const STTx& stTxn,
        TER terResult,
        bool bValidated,
        std::shared_ptr<ReadView const> const& lpCurrent);

    void
    pubValidatedTransaction(
        std::shared_ptr<ReadView const> const& alAccepted,
        const AcceptedLedgerTx& alTransaction);
    void
    pubAccountTransaction(
        std::shared_ptr<ReadView const> const& lpCurrent,
        const AcceptedLedgerTx& alTransaction,
        bool isAccepted);

    void
    pubServer();
    void
    pubConsensus(ConsensusPhase phase);

    std::string
    getHostId(bool forAdmin);

private:
    using SubMapType = hash_map<std::uint64_t, InfoSub::wptr>;
    using SubInfoMapType = hash_map<AccountID, SubMapType>;
    using subRpcMapType = hash_map<std::string, InfoSub::pointer>;

    Application& app_;
    clock_type& m_clock;
    beast::Journal m_journal;

    std::unique_ptr<LocalTxs> m_localTX;

    std::recursive_mutex mSubLock;

    std::atomic<OperatingMode> mMode;

    std::atomic<bool> needNetworkLedger_{false};
    std::atomic<bool> amendmentBlocked_{false};
    std::atomic<bool> amendmentWarned_{false};

    ClosureCounter<void, boost::system::error_code const&> waitHandlerCounter_;
    boost::asio::steady_timer heartbeatTimer_;
    boost::asio::steady_timer clusterTimer_;

    RCLConsensus mConsensus;

    ConsensusPhase mLastConsensusPhase;

    LedgerMaster& m_ledgerMaster;
    std::shared_ptr<InboundLedger> mAcquiringLedger;

    SubInfoMapType mSubAccount;
    SubInfoMapType mSubRTAccount;

    subRpcMapType mRpcSubMap;

    enum SubTypes {
        sLedger,          // Accepted ledgers.
        sManifests,       // Received validator manifests.
        sServer,          // When server changes connectivity state.
        sTransactions,    // All accepted transactions.
        sRTTransactions,  // All proposed and accepted transactions.
        sValidations,     // Received validations.
        sPeerStatus,      // Peer status changes.
        sConsensusPhase,  // Consensus phase

        sLastEntry = sConsensusPhase  // as this name implies, any new entry
                                      // must be ADDED ABOVE this one
    };
    std::array<SubMapType, SubTypes::sLastEntry + 1> mStreamMaps;

    ServerFeeSummary mLastFeeSummary;

    JobQueue& m_job_queue;

    // Whether we are in standalone mode.
    bool const m_standalone;

    // The number of nodes that we need to consider ourselves connected.
    std::size_t const minPeerCount_;

    // Transaction batching.
    std::condition_variable mCond;
    std::mutex mMutex;
    DispatchState mDispatchState = DispatchState::none;
    std::vector<TransactionStatus> mTransactions;

    StateAccounting accounting_{};

private:
    struct Stats
    {
        template <class Handler>
        Stats(
            Handler const& handler,
            beast::insight::Collector::ptr const& collector)
            : hook(collector->make_hook(handler))
            , disconnected_duration(collector->make_gauge(
                  "State_Accounting",
                  "Disconnected_duration"))
            , connected_duration(collector->make_gauge(
                  "State_Accounting",
                  "Connected_duration"))
            , syncing_duration(
                  collector->make_gauge("State_Accounting", "Syncing_duration"))
            , tracking_duration(collector->make_gauge(
                  "State_Accounting",
                  "Tracking_duration"))
            , full_duration(
                  collector->make_gauge("State_Accounting", "Full_duration"))
            , disconnected_transitions(collector->make_gauge(
                  "State_Accounting",
                  "Disconnected_transitions"))
            , connected_transitions(collector->make_gauge(
                  "State_Accounting",
                  "Connected_transitions"))
            , syncing_transitions(collector->make_gauge(
                  "State_Accounting",
                  "Syncing_transitions"))
            , tracking_transitions(collector->make_gauge(
                  "State_Accounting",
                  "Tracking_transitions"))
            , full_transitions(
                  collector->make_gauge("State_Accounting", "Full_transitions"))
        {
        }

        beast::insight::Hook hook;
        beast::insight::Gauge disconnected_duration;
        beast::insight::Gauge connected_duration;
        beast::insight::Gauge syncing_duration;
        beast::insight::Gauge tracking_duration;
        beast::insight::Gauge full_duration;

        beast::insight::Gauge disconnected_transitions;
        beast::insight::Gauge connected_transitions;
        beast::insight::Gauge syncing_transitions;
        beast::insight::Gauge tracking_transitions;
        beast::insight::Gauge full_transitions;
    };

    std::mutex m_statsMutex;  // Mutex to lock m_stats
    Stats m_stats;

private:
    void
    collect_metrics()
    {
        auto [counters, mode, start] = accounting_.getCounterData();
        auto const current =
            std::chrono::duration_cast<std::chrono::microseconds>(
                std::chrono::system_clock::now() - start);
        counters[static_cast<std::size_t>(mode)].dur += current;

        std::lock_guard lock(m_statsMutex);
        m_stats.disconnected_duration.set(
            counters[static_cast<std::size_t>(OperatingMode::DISCONNECTED)]
                .dur.count());
        m_stats.connected_duration.set(
            counters[static_cast<std::size_t>(OperatingMode::CONNECTED)]
                .dur.count());
        m_stats.syncing_duration.set(
            counters[static_cast<std::size_t>(OperatingMode::SYNCING)]
                .dur.count());
        m_stats.tracking_duration.set(
            counters[static_cast<std::size_t>(OperatingMode::TRACKING)]
                .dur.count());
        m_stats.full_duration.set(
            counters[static_cast<std::size_t>(OperatingMode::FULL)]
                .dur.count());

        m_stats.disconnected_transitions.set(
            counters[static_cast<std::size_t>(OperatingMode::DISCONNECTED)]
                .transitions);
        m_stats.connected_transitions.set(
            counters[static_cast<std::size_t>(OperatingMode::CONNECTED)]
                .transitions);
        m_stats.syncing_transitions.set(
            counters[static_cast<std::size_t>(OperatingMode::SYNCING)]
                .transitions);
        m_stats.tracking_transitions.set(
            counters[static_cast<std::size_t>(OperatingMode::TRACKING)]
                .transitions);
        m_stats.full_transitions.set(
            counters[static_cast<std::size_t>(OperatingMode::FULL)]
                .transitions);
    }
};

//------------------------------------------------------------------------------

static std::array<char const*, 5> const stateNames{
    {"disconnected", "connected", "syncing", "tracking", "full"}};

std::array<char const*, 5> const NetworkOPsImp::states_ = stateNames;

std::array<Json::StaticString const, 5> const
    NetworkOPsImp::StateAccounting::states_ = {
        {Json::StaticString(stateNames[0]),
         Json::StaticString(stateNames[1]),
         Json::StaticString(stateNames[2]),
         Json::StaticString(stateNames[3]),
         Json::StaticString(stateNames[4])}};

//------------------------------------------------------------------------------
std::string
NetworkOPsImp::getHostId(bool forAdmin)
{
    static std::string const hostname = boost::asio::ip::host_name();

    if (forAdmin)
        return hostname;

    // For non-admin uses hash the node public key into a
    // single RFC1751 word:
    static std::string const shroudedHostId = [this]() {
        auto const& id = app_.nodeIdentity();

        return RFC1751::getWordFromBlob(id.first.data(), id.first.size());
    }();

    return shroudedHostId;
}

void
NetworkOPsImp::setStateTimer()
{
    setHeartbeatTimer();
    setClusterTimer();
}

void
NetworkOPsImp::setHeartbeatTimer()
{
    // Only start the timer if waitHandlerCounter_ is not yet joined.
    if (auto optionalCountedHandler = waitHandlerCounter_.wrap(
            [this](boost::system::error_code const& e) {
                if ((e.value() == boost::system::errc::success) &&
                    (!m_job_queue.isStopped()))
                {
                    m_job_queue.addJob(
                        jtNETOP_TIMER, "NetOPs.heartbeat", [this](Job&) {
                            processHeartbeatTimer();
                        });
                }
                // Recover as best we can if an unexpected error occurs.
                if (e.value() != boost::system::errc::success &&
                    e.value() != boost::asio::error::operation_aborted)
                {
                    // Try again later and hope for the best.
                    JLOG(m_journal.error())
                        << "Heartbeat timer got error '" << e.message()
                        << "'.  Restarting timer.";
                    setHeartbeatTimer();
                }
            }))
    {
        heartbeatTimer_.expires_from_now(mConsensus.parms().ledgerGRANULARITY);
        heartbeatTimer_.async_wait(std::move(*optionalCountedHandler));
    }
}

void
NetworkOPsImp::setClusterTimer()
{
    // Only start the timer if waitHandlerCounter_ is not yet joined.
    if (auto optionalCountedHandler = waitHandlerCounter_.wrap(
            [this](boost::system::error_code const& e) {
                if ((e.value() == boost::system::errc::success) &&
                    (!m_job_queue.isStopped()))
                {
                    m_job_queue.addJob(
                        jtNETOP_CLUSTER, "NetOPs.cluster", [this](Job&) {
                            processClusterTimer();
                        });
                }
                // Recover as best we can if an unexpected error occurs.
                if (e.value() != boost::system::errc::success &&
                    e.value() != boost::asio::error::operation_aborted)
                {
                    // Try again later and hope for the best.
                    JLOG(m_journal.error())
                        << "Cluster timer got error '" << e.message()
                        << "'.  Restarting timer.";
                    setClusterTimer();
                }
            }))
    {
        using namespace std::chrono_literals;
        clusterTimer_.expires_from_now(10s);
        clusterTimer_.async_wait(std::move(*optionalCountedHandler));
    }
}

void
NetworkOPsImp::processHeartbeatTimer()
{
    {
        std::unique_lock lock{app_.getMasterMutex()};

        // VFALCO NOTE This is for diagnosing a crash on exit
        LoadManager& mgr(app_.getLoadManager());
        mgr.resetDeadlockDetector();

        std::size_t const numPeers = app_.overlay().size();

        // do we have sufficient peers? If not, we are disconnected.
        if (numPeers < minPeerCount_)
        {
            if (mMode != OperatingMode::DISCONNECTED)
            {
                setMode(OperatingMode::DISCONNECTED);
                JLOG(m_journal.warn())
                    << "Node count (" << numPeers << ") has fallen "
                    << "below required minimum (" << minPeerCount_ << ").";
            }

            // MasterMutex lock need not be held to call setHeartbeatTimer()
            lock.unlock();
            // We do not call mConsensus.timerEntry until there are enough
            // peers providing meaningful inputs to consensus
            setHeartbeatTimer();
            return;
        }

        if (mMode == OperatingMode::DISCONNECTED)
        {
            setMode(OperatingMode::CONNECTED);
            JLOG(m_journal.info())
                << "Node count (" << numPeers << ") is sufficient.";
        }

        // Check if the last validated ledger forces a change between these
        // states.
        if (mMode == OperatingMode::SYNCING)
            setMode(OperatingMode::SYNCING);
        else if (mMode == OperatingMode::CONNECTED)
            setMode(OperatingMode::CONNECTED);
    }

    mConsensus.timerEntry(app_.timeKeeper().closeTime());

    const ConsensusPhase currPhase = mConsensus.phase();
    if (mLastConsensusPhase != currPhase)
    {
        reportConsensusStateChange(currPhase);
        mLastConsensusPhase = currPhase;
    }

    setHeartbeatTimer();
}

void
NetworkOPsImp::processClusterTimer()
{
    using namespace std::chrono_literals;
    bool const update = app_.cluster().update(
        app_.nodeIdentity().first,
        "",
        (m_ledgerMaster.getValidatedLedgerAge() <= 4min)
            ? app_.getFeeTrack().getLocalFee()
            : 0,
        app_.timeKeeper().now());

    if (!update)
    {
        JLOG(m_journal.debug()) << "Too soon to send cluster update";
        setClusterTimer();
        return;
    }

    protocol::TMCluster cluster;
    app_.cluster().for_each([&cluster](ClusterNode const& node) {
        protocol::TMClusterNode& n = *cluster.add_clusternodes();
        n.set_publickey(toBase58(TokenType::NodePublic, node.identity()));
        n.set_reporttime(node.getReportTime().time_since_epoch().count());
        n.set_nodeload(node.getLoadFee());
        if (!node.name().empty())
            n.set_nodename(node.name());
    });

    Resource::Gossip gossip = app_.getResourceManager().exportConsumers();
    for (auto& item : gossip.items)
    {
        protocol::TMLoadSource& node = *cluster.add_loadsources();
        node.set_name(to_string(item.address));
        node.set_cost(item.balance);
    }
    app_.overlay().foreach(send_if(
        std::make_shared<Message>(cluster, protocol::mtCLUSTER),
        peer_in_cluster()));
    setClusterTimer();
}

//------------------------------------------------------------------------------

std::string
NetworkOPsImp::strOperatingMode(OperatingMode const mode, bool const admin)
    const
{
    if (mode == OperatingMode::FULL && admin)
    {
        auto const consensusMode = mConsensus.mode();
        if (consensusMode != ConsensusMode::wrongLedger)
        {
            if (consensusMode == ConsensusMode::proposing)
                return "proposing";

            if (mConsensus.validating())
                return "validating";
        }
    }

    return states_[static_cast<std::size_t>(mode)];
}

void
NetworkOPsImp::submitTransaction(std::shared_ptr<STTx const> const& iTrans)
{
    if (isNeedNetworkLedger())
    {
        // Nothing we can do if we've never been in sync
        return;
    }

    // this is an asynchronous interface
    auto const trans = sterilize(*iTrans);

    auto const txid = trans->getTransactionID();
    auto const flags = app_.getHashRouter().getFlags(txid);

    if ((flags & SF_BAD) != 0)
    {
        JLOG(m_journal.warn()) << "Submitted transaction cached bad";
        return;
    }

    try
    {
        auto const [validity, reason] = checkValidity(
            app_.getHashRouter(),
            *trans,
            m_ledgerMaster.getValidatedRules(),
            app_.config());

        if (validity != Validity::Valid)
        {
            JLOG(m_journal.warn())
                << "Submitted transaction invalid: " << reason;
            return;
        }
    }
    catch (std::exception const&)
    {
        JLOG(m_journal.warn()) << "Exception checking transaction" << txid;

        return;
    }

    std::string reason;

    auto tx = std::make_shared<Transaction>(trans, reason, app_);

    m_job_queue.addJob(jtTRANSACTION, "submitTxn", [this, tx](Job&) {
        auto t = tx;
        processTransaction(t, false, false, FailHard::no);
    });
}

void
NetworkOPsImp::processTransaction(
    std::shared_ptr<Transaction>& transaction,
    bool bUnlimited,
    bool bLocal,
    FailHard failType)
{
    auto ev = m_job_queue.makeLoadEvent(jtTXN_PROC, "ProcessTXN");
    auto const newFlags = app_.getHashRouter().getFlags(transaction->getID());

    if ((newFlags & SF_BAD) != 0)
    {
        // cached bad
        transaction->setStatus(INVALID);
        transaction->setResult(temBAD_SIGNATURE);
        return;
    }

    // NOTE eahennis - I think this check is redundant,
    // but I'm not 100% sure yet.
    // If so, only cost is looking up HashRouter flags.
    auto const view = m_ledgerMaster.getCurrentLedger();
    auto const [validity, reason] = checkValidity(
        app_.getHashRouter(),
        *transaction->getSTransaction(),
        view->rules(),
        app_.config());
    assert(validity == Validity::Valid);

    // Not concerned with local checks at this point.
    if (validity == Validity::SigBad)
    {
        JLOG(m_journal.info()) << "Transaction has bad signature: " << reason;
        transaction->setStatus(INVALID);
        transaction->setResult(temBAD_SIGNATURE);
        app_.getHashRouter().setFlags(transaction->getID(), SF_BAD);
        return;
    }

    // canonicalize can change our pointer
    app_.getMasterTransaction().canonicalize(&transaction);

    if (bLocal)
        doTransactionSync(transaction, bUnlimited, failType);
    else
        doTransactionAsync(transaction, bUnlimited, failType);
}

void
NetworkOPsImp::doTransactionAsync(
    std::shared_ptr<Transaction> transaction,
    bool bUnlimited,
    FailHard failType)
{
    std::lock_guard lock(mMutex);

    if (transaction->getApplying())
        return;

    mTransactions.push_back(
        TransactionStatus(transaction, bUnlimited, false, failType));
    transaction->setApplying();

    if (mDispatchState == DispatchState::none)
    {
        if (m_job_queue.addJob(jtBATCH, "transactionBatch", [this](Job&) {
                transactionBatch();
            }))
        {
            mDispatchState = DispatchState::scheduled;
        }
    }
}

void
NetworkOPsImp::doTransactionSync(
    std::shared_ptr<Transaction> transaction,
    bool bUnlimited,
    FailHard failType)
{
    std::unique_lock<std::mutex> lock(mMutex);

    if (!transaction->getApplying())
    {
        mTransactions.push_back(
            TransactionStatus(transaction, bUnlimited, true, failType));
        transaction->setApplying();
    }

    do
    {
        if (mDispatchState == DispatchState::running)
        {
            // A batch processing job is already running, so wait.
            mCond.wait(lock);
        }
        else
        {
            apply(lock);

            if (mTransactions.size())
            {
                // More transactions need to be applied, but by another job.
                if (m_job_queue.addJob(
                        jtBATCH, "transactionBatch", [this](Job&) {
                            transactionBatch();
                        }))
                {
                    mDispatchState = DispatchState::scheduled;
                }
            }
        }
    } while (transaction->getApplying());
}

void
NetworkOPsImp::transactionBatch()
{
    std::unique_lock<std::mutex> lock(mMutex);

    if (mDispatchState == DispatchState::running)
        return;

    while (mTransactions.size())
    {
        apply(lock);
    }
}

void
NetworkOPsImp::apply(std::unique_lock<std::mutex>& batchLock)
{
    std::vector<TransactionStatus> submit_held;
    std::vector<TransactionStatus> transactions;
    mTransactions.swap(transactions);
    assert(!transactions.empty());

    assert(mDispatchState != DispatchState::running);
    mDispatchState = DispatchState::running;

    batchLock.unlock();

    {
        std::unique_lock masterLock{app_.getMasterMutex(), std::defer_lock};
        bool changed = false;
        {
            std::unique_lock ledgerLock{
                m_ledgerMaster.peekMutex(), std::defer_lock};
            std::lock(masterLock, ledgerLock);

            app_.openLedger().modify([&](OpenView& view, beast::Journal j) {
                for (TransactionStatus& e : transactions)
                {
                    // we check before adding to the batch
                    ApplyFlags flags = tapNONE;
                    if (e.admin)
                        flags |= tapUNLIMITED;

                    if (e.failType == FailHard::yes)
                        flags |= tapFAIL_HARD;

                    auto const result = app_.getTxQ().apply(
                        app_, view, e.transaction->getSTransaction(), flags, j);
                    e.result = result.first;
                    e.applied = result.second;
                    changed = changed || result.second;
                }
                return changed;
            });
        }
        if (changed)
            reportFeeChange();

        boost::optional<LedgerIndex> validatedLedgerIndex;
        if (auto const l = m_ledgerMaster.getValidatedLedger())
            validatedLedgerIndex = l->info().seq;

        auto newOL = app_.openLedger().current();
        for (TransactionStatus& e : transactions)
        {
            e.transaction->clearSubmitResult();

            if (e.applied)
            {
                pubProposedTransaction(
                    newOL, e.transaction->getSTransaction(), e.result);
                e.transaction->setApplied();
            }

            e.transaction->setResult(e.result);

            if (isTemMalformed(e.result))
                app_.getHashRouter().setFlags(e.transaction->getID(), SF_BAD);

#ifdef DEBUG
            if (e.result != tesSUCCESS)
            {
                std::string token, human;

                if (transResultInfo(e.result, token, human))
                {
                    JLOG(m_journal.info())
                        << "TransactionResult: " << token << ": " << human;
                }
            }
#endif

            bool addLocal = e.local;

            if (e.result == tesSUCCESS)
            {
                JLOG(m_journal.debug())
                    << "Transaction is now included in open ledger";
                e.transaction->setStatus(INCLUDED);

                auto txCur = e.transaction->getSTransaction();
                for (auto const& tx : m_ledgerMaster.pruneHeldTransactions(
                         txCur->getAccountID(sfAccount),
                         txCur->getSequence() + 1))
                {
                    std::string reason;
                    auto const trans = sterilize(*tx);
                    auto t = std::make_shared<Transaction>(trans, reason, app_);
                    submit_held.emplace_back(t, false, false, FailHard::no);
                    t->setApplying();
                }
            }
            else if (e.result == tefPAST_SEQ)
            {
                // duplicate or conflict
                JLOG(m_journal.info()) << "Transaction is obsolete";
                e.transaction->setStatus(OBSOLETE);
            }
            else if (e.result == terQUEUED)
            {
                JLOG(m_journal.debug())
                    << "Transaction is likely to claim a"
                    << " fee, but is queued until fee drops";

                e.transaction->setStatus(HELD);
                // Add to held transactions, because it could get
                // kicked out of the queue, and this will try to
                // put it back.
                m_ledgerMaster.addHeldTransaction(e.transaction);
                e.transaction->setQueued();
                e.transaction->setKept();
            }
            else if (isTerRetry(e.result))
            {
                if (e.failType != FailHard::yes)
                {
                    // transaction should be held
                    JLOG(m_journal.debug())
                        << "Transaction should be held: " << e.result;
                    e.transaction->setStatus(HELD);
                    m_ledgerMaster.addHeldTransaction(e.transaction);
                    e.transaction->setKept();
                }
            }
            else
            {
                JLOG(m_journal.debug())
                    << "Status other than success " << e.result;
                e.transaction->setStatus(INVALID);
            }

            auto const enforceFailHard =
                e.failType == FailHard::yes && !isTesSuccess(e.result);

            if (addLocal && !enforceFailHard)
            {
                m_localTX->push_back(
                    m_ledgerMaster.getCurrentLedgerIndex(),
                    e.transaction->getSTransaction());
                e.transaction->setKept();
            }

            if ((e.applied ||
                 ((mMode != OperatingMode::FULL) &&
                  (e.failType != FailHard::yes) && e.local) ||
                 (e.result == terQUEUED)) &&
                !enforceFailHard)
            {
                auto const toSkip =
                    app_.getHashRouter().shouldRelay(e.transaction->getID());

                if (toSkip)
                {
                    protocol::TMTransaction tx;
                    Serializer s;

                    e.transaction->getSTransaction()->add(s);
                    tx.set_rawtransaction(s.data(), s.size());
                    tx.set_status(protocol::tsCURRENT);
                    tx.set_receivetimestamp(
                        app_.timeKeeper().now().time_since_epoch().count());
                    tx.set_deferred(e.result == terQUEUED);
                    // FIXME: This should be when we received it
                    app_.overlay().foreach(send_if_not(
                        std::make_shared<Message>(tx, protocol::mtTRANSACTION),
                        peer_in_set(*toSkip)));
                    e.transaction->setBroadcast();
                }
            }

            if (validatedLedgerIndex)
            {
                auto [fee, accountSeq, availableSeq] =
                    app_.getTxQ().getTxRequiredFeeAndSeq(
                        *newOL, e.transaction->getSTransaction());
                e.transaction->setCurrentLedgerState(
                    *validatedLedgerIndex, fee, accountSeq, availableSeq);
            }
        }
    }

    batchLock.lock();

    for (TransactionStatus& e : transactions)
        e.transaction->clearApplying();

    if (!submit_held.empty())
    {
        if (mTransactions.empty())
            mTransactions.swap(submit_held);
        else
            for (auto& e : submit_held)
                mTransactions.push_back(std::move(e));
    }

    mCond.notify_all();

    mDispatchState = DispatchState::none;
}

//
// Owner functions
//

Json::Value
NetworkOPsImp::getOwnerInfo(
    std::shared_ptr<ReadView const> lpLedger,
    AccountID const& account)
{
    Json::Value jvObjects(Json::objectValue);
    auto root = keylet::ownerDir(account);
    auto sleNode = lpLedger->read(keylet::page(root));
    if (sleNode)
    {
        std::uint64_t uNodeDir;

        do
        {
            for (auto const& uDirEntry : sleNode->getFieldV256(sfIndexes))
            {
                auto sleCur = lpLedger->read(keylet::child(uDirEntry));
                assert(sleCur);

                switch (sleCur->getType())
                {
                    case ltOFFER:
                        if (!jvObjects.isMember(jss::offers))
                            jvObjects[jss::offers] =
                                Json::Value(Json::arrayValue);

                        jvObjects[jss::offers].append(
                            sleCur->getJson(JsonOptions::none));
                        break;

                    case ltRIPPLE_STATE:
                        if (!jvObjects.isMember(jss::ripple_lines))
                        {
                            jvObjects[jss::ripple_lines] =
                                Json::Value(Json::arrayValue);
                        }

                        jvObjects[jss::ripple_lines].append(
                            sleCur->getJson(JsonOptions::none));
                        break;

                    case ltACCOUNT_ROOT:
                    case ltDIR_NODE:
                    default:
                        assert(false);
                        break;
                }
            }

            uNodeDir = sleNode->getFieldU64(sfIndexNext);

            if (uNodeDir)
            {
                sleNode = lpLedger->read(keylet::page(root, uNodeDir));
                assert(sleNode);
            }
        } while (uNodeDir);
    }

    return jvObjects;
}

//
// Other
//

void
NetworkOPsImp::setAmendmentBlocked()
{
    amendmentBlocked_ = true;
    setMode(OperatingMode::TRACKING);
}

bool
NetworkOPsImp::checkLastClosedLedger(
    const Overlay::PeerSequence& peerList,
    uint256& networkClosed)
{
    // Returns true if there's an *abnormal* ledger issue, normal changing in
    // TRACKING mode should return false.  Do we have sufficient validations for
    // our last closed ledger? Or do sufficient nodes agree? And do we have no
    // better ledger available?  If so, we are either tracking or full.

    JLOG(m_journal.trace()) << "NetworkOPsImp::checkLastClosedLedger";

    auto const ourClosed = m_ledgerMaster.getClosedLedger();

    if (!ourClosed)
        return false;

    uint256 closedLedger = ourClosed->info().hash;
    uint256 prevClosedLedger = ourClosed->info().parentHash;
    JLOG(m_journal.trace()) << "OurClosed:  " << closedLedger;
    JLOG(m_journal.trace()) << "PrevClosed: " << prevClosedLedger;

    //-------------------------------------------------------------------------
    // Determine preferred last closed ledger

    auto& validations = app_.getValidations();
    JLOG(m_journal.debug())
        << "ValidationTrie " << Json::Compact(validations.getJsonTrie());

    // Will rely on peer LCL if no trusted validations exist
    hash_map<uint256, std::uint32_t> peerCounts;
    peerCounts[closedLedger] = 0;
    if (mMode >= OperatingMode::TRACKING)
        peerCounts[closedLedger]++;

    for (auto& peer : peerList)
    {
        uint256 peerLedger = peer->getClosedLedgerHash();

        if (peerLedger.isNonZero())
            ++peerCounts[peerLedger];
    }

    for (auto const& it : peerCounts)
        JLOG(m_journal.debug()) << "L: " << it.first << " n=" << it.second;

    uint256 preferredLCL = validations.getPreferredLCL(
        RCLValidatedLedger{ourClosed, validations.adaptor().journal()},
        m_ledgerMaster.getValidLedgerIndex(),
        peerCounts);

    bool switchLedgers = preferredLCL != closedLedger;
    if (switchLedgers)
        closedLedger = preferredLCL;
    //-------------------------------------------------------------------------
    if (switchLedgers && (closedLedger == prevClosedLedger))
    {
        // don't switch to our own previous ledger
        JLOG(m_journal.info()) << "We won't switch to our own previous ledger";
        networkClosed = ourClosed->info().hash;
        switchLedgers = false;
    }
    else
        networkClosed = closedLedger;

    if (!switchLedgers)
        return false;

    auto consensus = m_ledgerMaster.getLedgerByHash(closedLedger);

    if (!consensus)
        consensus = app_.getInboundLedgers().acquire(
            closedLedger, 0, InboundLedger::Reason::CONSENSUS);

    if (consensus &&
        (!m_ledgerMaster.canBeCurrent(consensus) ||
         !m_ledgerMaster.isCompatible(
             *consensus, m_journal.debug(), "Not switching")))
    {
        // Don't switch to a ledger not on the validated chain
        // or with an invalid close time or sequence
        networkClosed = ourClosed->info().hash;
        return false;
    }

    JLOG(m_journal.warn()) << "We are not running on the consensus ledger";
    JLOG(m_journal.info()) << "Our LCL: " << getJson(*ourClosed);
    JLOG(m_journal.info()) << "Net LCL " << closedLedger;

    if ((mMode == OperatingMode::TRACKING) || (mMode == OperatingMode::FULL))
    {
        setMode(OperatingMode::CONNECTED);
    }

    if (consensus)
    {
        // FIXME: If this rewinds the ledger sequence, or has the same
        // sequence, we should update the status on any stored transactions
        // in the invalidated ledgers.
        switchLastClosedLedger(consensus);
    }

    return true;
}

void
NetworkOPsImp::switchLastClosedLedger(
    std::shared_ptr<Ledger const> const& newLCL)
{
    // set the newLCL as our last closed ledger -- this is abnormal code
    JLOG(m_journal.error())
        << "JUMP last closed ledger to " << newLCL->info().hash;

    clearNeedNetworkLedger();

    // Update fee computations.
    app_.getTxQ().processClosedLedger(app_, *newLCL, true);

    // Caller must own master lock
    {
        // Apply tx in old open ledger to new
        // open ledger. Then apply local tx.

        auto retries = m_localTX->getTxSet();
        auto const lastVal = app_.getLedgerMaster().getValidatedLedger();
        boost::optional<Rules> rules;
        if (lastVal)
            rules.emplace(*lastVal, app_.config().features);
        else
            rules.emplace(app_.config().features);
        app_.openLedger().accept(
            app_,
            *rules,
            newLCL,
            OrderedTxs({}),
            false,
            retries,
            tapNONE,
            "jump",
            [&](OpenView& view, beast::Journal j) {
                // Stuff the ledger with transactions from the queue.
                return app_.getTxQ().accept(app_, view);
            });
    }

    m_ledgerMaster.switchLCL(newLCL);

    protocol::TMStatusChange s;
    s.set_newevent(protocol::neSWITCHED_LEDGER);
    s.set_ledgerseq(newLCL->info().seq);
    s.set_networktime(app_.timeKeeper().now().time_since_epoch().count());
    s.set_ledgerhashprevious(
        newLCL->info().parentHash.begin(), newLCL->info().parentHash.size());
    s.set_ledgerhash(newLCL->info().hash.begin(), newLCL->info().hash.size());

    app_.overlay().foreach(
        send_always(std::make_shared<Message>(s, protocol::mtSTATUS_CHANGE)));
}

bool
NetworkOPsImp::beginConsensus(uint256 const& networkClosed)
{
    assert(networkClosed.isNonZero());

    auto closingInfo = m_ledgerMaster.getCurrentLedger()->info();

    JLOG(m_journal.info()) << "Consensus time for #" << closingInfo.seq
                           << " with LCL " << closingInfo.parentHash;

    auto prevLedger = m_ledgerMaster.getLedgerByHash(closingInfo.parentHash);

    if (!prevLedger)
    {
        // this shouldn't happen unless we jump ledgers
        if (mMode == OperatingMode::FULL)
        {
            JLOG(m_journal.warn()) << "Don't have LCL, going to tracking";
            setMode(OperatingMode::TRACKING);
        }

        return false;
    }

    assert(prevLedger->info().hash == closingInfo.parentHash);
    assert(
        closingInfo.parentHash ==
        m_ledgerMaster.getClosedLedger()->info().hash);

    TrustChanges const changes = app_.validators().updateTrusted(
        app_.getValidations().getCurrentNodeIDs());

    if (!changes.added.empty() || !changes.removed.empty())
        app_.getValidations().trustChanged(changes.added, changes.removed);

    mConsensus.startRound(
        app_.timeKeeper().closeTime(),
        networkClosed,
        prevLedger,
        changes.removed);

    const ConsensusPhase currPhase = mConsensus.phase();
    if (mLastConsensusPhase != currPhase)
    {
        reportConsensusStateChange(currPhase);
        mLastConsensusPhase = currPhase;
    }

    JLOG(m_journal.debug()) << "Initiating consensus engine";
    return true;
}

uint256
NetworkOPsImp::getConsensusLCL()
{
    return mConsensus.prevLedgerID();
}

void
NetworkOPsImp::processTrustedProposal(
    RCLCxPeerPos peerPos,
    std::shared_ptr<protocol::TMProposeSet> set)
{
    if (mConsensus.peerProposal(app_.timeKeeper().closeTime(), peerPos))
    {
        app_.overlay().relay(*set, peerPos.suppressionID());
    }
    else
        JLOG(m_journal.info()) << "Not relaying trusted proposal";
}

void
NetworkOPsImp::mapComplete(std::shared_ptr<SHAMap> const& map, bool fromAcquire)
{
    // We now have an additional transaction set
    // either created locally during the consensus process
    // or acquired from a peer

    // Inform peers we have this set
    protocol::TMHaveTransactionSet msg;
    msg.set_hash(map->getHash().as_uint256().begin(), 256 / 8);
    msg.set_status(protocol::tsHAVE);
    app_.overlay().foreach(
        send_always(std::make_shared<Message>(msg, protocol::mtHAVE_SET)));

    // We acquired it because consensus asked us to
    if (fromAcquire)
        mConsensus.gotTxSet(app_.timeKeeper().closeTime(), RCLTxSet{map});
}

void
NetworkOPsImp::endConsensus()
{
    uint256 deadLedger = m_ledgerMaster.getClosedLedger()->info().parentHash;

    for (auto const& it : app_.overlay().getActivePeers())
    {
        if (it && (it->getClosedLedgerHash() == deadLedger))
        {
            JLOG(m_journal.trace()) << "Killing obsolete peer status";
            it->cycleStatus();
        }
    }

    uint256 networkClosed;
    bool ledgerChange =
        checkLastClosedLedger(app_.overlay().getActivePeers(), networkClosed);

    if (networkClosed.isZero())
        return;

    // WRITEME: Unless we are in FULL and in the process of doing a consensus,
    // we must count how many nodes share our LCL, how many nodes disagree with
    // our LCL, and how many validations our LCL has. We also want to check
    // timing to make sure there shouldn't be a newer LCL. We need this
    // information to do the next three tests.

    if (((mMode == OperatingMode::CONNECTED) ||
         (mMode == OperatingMode::SYNCING)) &&
        !ledgerChange)
    {
        // Count number of peers that agree with us and UNL nodes whose
        // validations we have for LCL.  If the ledger is good enough, go to
        // TRACKING - TODO
        if (!needNetworkLedger_)
            setMode(OperatingMode::TRACKING);
    }

    if (((mMode == OperatingMode::CONNECTED) ||
         (mMode == OperatingMode::TRACKING)) &&
        !ledgerChange)
    {
        // check if the ledger is good enough to go to FULL
        // Note: Do not go to FULL if we don't have the previous ledger
        // check if the ledger is bad enough to go to CONNECTE  D -- TODO
        auto current = m_ledgerMaster.getCurrentLedger();
        if (app_.timeKeeper().now() < (current->info().parentCloseTime +
                                       2 * current->info().closeTimeResolution))
        {
            setMode(OperatingMode::FULL);
        }
    }

    beginConsensus(networkClosed);
}

void
NetworkOPsImp::consensusViewChange()
{
    if ((mMode == OperatingMode::FULL) || (mMode == OperatingMode::TRACKING))
    {
        setMode(OperatingMode::CONNECTED);
    }
}

void
NetworkOPsImp::pubManifest(Manifest const& mo)
{
    // VFALCO consider std::shared_mutex
    std::lock_guard sl(mSubLock);

    if (!mStreamMaps[sManifests].empty())
    {
        Json::Value jvObj(Json::objectValue);

        jvObj[jss::type] = "manifestReceived";
        jvObj[jss::master_key] = toBase58(TokenType::NodePublic, mo.masterKey);
        if (!mo.signingKey.empty())
            jvObj[jss::signing_key] =
                toBase58(TokenType::NodePublic, mo.signingKey);
        jvObj[jss::seq] = Json::UInt(mo.sequence);
        if (auto sig = mo.getSignature())
            jvObj[jss::signature] = strHex(*sig);
        jvObj[jss::master_signature] = strHex(mo.getMasterSignature());

        for (auto i = mStreamMaps[sManifests].begin();
             i != mStreamMaps[sManifests].end();)
        {
            if (auto p = i->second.lock())
            {
                p->send(jvObj, true);
                ++i;
            }
            else
            {
                i = mStreamMaps[sManifests].erase(i);
            }
        }
    }
}

NetworkOPsImp::ServerFeeSummary::ServerFeeSummary(
    XRPAmount fee,
    TxQ::Metrics&& escalationMetrics,
    LoadFeeTrack const& loadFeeTrack)
    : loadFactorServer{loadFeeTrack.getLoadFactor()}
    , loadBaseServer{loadFeeTrack.getLoadBase()}
    , baseFee{fee}
    , em{std::move(escalationMetrics)}
{
}

bool
NetworkOPsImp::ServerFeeSummary::operator!=(
    NetworkOPsImp::ServerFeeSummary const& b) const
{
    if (loadFactorServer != b.loadFactorServer ||
        loadBaseServer != b.loadBaseServer || baseFee != b.baseFee ||
        em.is_initialized() != b.em.is_initialized())
        return true;

    if (em && b.em)
    {
        return (
            em->minProcessingFeeLevel != b.em->minProcessingFeeLevel ||
            em->openLedgerFeeLevel != b.em->openLedgerFeeLevel ||
            em->referenceFeeLevel != b.em->referenceFeeLevel);
    }

    return false;
}

// Need to cap to uint64 to uint32 due to JSON limitations
static std::uint32_t
trunc32(std::uint64_t v)
{
    constexpr std::uint64_t max32 = std::numeric_limits<std::uint32_t>::max();

    return std::min(max32, v);
};

void
NetworkOPsImp::pubServer()
{
    // VFALCO TODO Don't hold the lock across calls to send...make a copy of the
    //             list into a local array while holding the lock then release
    //             the lock and call send on everyone.
    //
    std::lock_guard sl(mSubLock);

    if (!mStreamMaps[sServer].empty())
    {
        Json::Value jvObj(Json::objectValue);

        ServerFeeSummary f{
            app_.openLedger().current()->fees().base,
            app_.getTxQ().getMetrics(*app_.openLedger().current()),
            app_.getFeeTrack()};

        jvObj[jss::type] = "serverStatus";
        jvObj[jss::server_status] = strOperatingMode();
        jvObj[jss::load_base] = f.loadBaseServer;
        jvObj[jss::load_factor_server] = f.loadFactorServer;
        jvObj[jss::base_fee] = f.baseFee.jsonClipped();

        if (f.em)
        {
            auto const loadFactor = std::max(
                safe_cast<std::uint64_t>(f.loadFactorServer),
                mulDiv(
                    f.em->openLedgerFeeLevel,
                    f.loadBaseServer,
                    f.em->referenceFeeLevel)
                    .second);

            jvObj[jss::load_factor] = trunc32(loadFactor);
            jvObj[jss::load_factor_fee_escalation] =
                f.em->openLedgerFeeLevel.jsonClipped();
            jvObj[jss::load_factor_fee_queue] =
                f.em->minProcessingFeeLevel.jsonClipped();
            jvObj[jss::load_factor_fee_reference] =
                f.em->referenceFeeLevel.jsonClipped();
        }
        else
            jvObj[jss::load_factor] = f.loadFactorServer;

        mLastFeeSummary = f;

        for (auto i = mStreamMaps[sServer].begin();
             i != mStreamMaps[sServer].end();)
        {
            InfoSub::pointer p = i->second.lock();

            // VFALCO TODO research the possibility of using thread queues and
            //             linearizing the deletion of subscribers with the
            //             sending of JSON data.
            if (p)
            {
                p->send(jvObj, true);
                ++i;
            }
            else
            {
                i = mStreamMaps[sServer].erase(i);
            }
        }
    }
}

void
NetworkOPsImp::pubConsensus(ConsensusPhase phase)
{
    std::lock_guard sl(mSubLock);

    auto& streamMap = mStreamMaps[sConsensusPhase];
    if (!streamMap.empty())
    {
        Json::Value jvObj(Json::objectValue);
        jvObj[jss::type] = "consensusPhase";
        jvObj[jss::consensus] = to_string(phase);

        for (auto i = streamMap.begin(); i != streamMap.end();)
        {
            if (auto p = i->second.lock())
            {
                p->send(jvObj, true);
                ++i;
            }
            else
            {
                i = streamMap.erase(i);
            }
        }
    }
}

void
NetworkOPsImp::pubValidation(std::shared_ptr<STValidation> const& val)
{
    // VFALCO consider std::shared_mutex
    std::lock_guard sl(mSubLock);

    if (!mStreamMaps[sValidations].empty())
    {
        Json::Value jvObj(Json::objectValue);

        auto const signerPublic = val->getSignerPublic();

        jvObj[jss::type] = "validationReceived";
        jvObj[jss::validation_public_key] =
            toBase58(TokenType::NodePublic, signerPublic);
        jvObj[jss::ledger_hash] = to_string(val->getLedgerHash());
        jvObj[jss::signature] = strHex(val->getSignature());
        jvObj[jss::full] = val->isFull();
        jvObj[jss::flags] = val->getFlags();
        jvObj[jss::signing_time] = *(*val)[~sfSigningTime];

        auto const masterKey =
            app_.validatorManifests().getMasterKey(signerPublic);

        if (masterKey != signerPublic)
            jvObj[jss::master_key] = toBase58(TokenType::NodePublic, masterKey);

        if (auto const seq = (*val)[~sfLedgerSequence])
            jvObj[jss::ledger_index] = to_string(*seq);

        if (val->isFieldPresent(sfAmendments))
        {
            jvObj[jss::amendments] = Json::Value(Json::arrayValue);
            for (auto const& amendment : val->getFieldV256(sfAmendments))
                jvObj[jss::amendments].append(to_string(amendment));
        }

        if (auto const closeTime = (*val)[~sfCloseTime])
            jvObj[jss::close_time] = *closeTime;

        if (auto const loadFee = (*val)[~sfLoadFee])
            jvObj[jss::load_fee] = *loadFee;

        if (auto const baseFee = (*val)[~sfBaseFee])
            jvObj[jss::base_fee] = static_cast<double>(*baseFee);

        if (auto const reserveBase = (*val)[~sfReserveBase])
            jvObj[jss::reserve_base] = *reserveBase;

        if (auto const reserveInc = (*val)[~sfReserveIncrement])
            jvObj[jss::reserve_inc] = *reserveInc;

        for (auto i = mStreamMaps[sValidations].begin();
             i != mStreamMaps[sValidations].end();)
        {
            if (auto p = i->second.lock())
            {
                p->send(jvObj, true);
                ++i;
            }
            else
            {
                i = mStreamMaps[sValidations].erase(i);
            }
        }
    }
}

void
NetworkOPsImp::pubPeerStatus(std::function<Json::Value(void)> const& func)
{
    std::lock_guard sl(mSubLock);

    if (!mStreamMaps[sPeerStatus].empty())
    {
        Json::Value jvObj(func());

        jvObj[jss::type] = "peerStatusChange";

        for (auto i = mStreamMaps[sPeerStatus].begin();
             i != mStreamMaps[sPeerStatus].end();)
        {
            InfoSub::pointer p = i->second.lock();

            if (p)
            {
                p->send(jvObj, true);
                ++i;
            }
            else
            {
                i = mStreamMaps[sPeerStatus].erase(i);
            }
        }
    }
}

void
NetworkOPsImp::setMode(OperatingMode om)
{
    using namespace std::chrono_literals;
    if (om == OperatingMode::CONNECTED)
    {
        if (app_.getLedgerMaster().getValidatedLedgerAge() < 1min)
            om = OperatingMode::SYNCING;
    }
    else if (om == OperatingMode::SYNCING)
    {
        if (app_.getLedgerMaster().getValidatedLedgerAge() >= 1min)
            om = OperatingMode::CONNECTED;
    }

    if ((om > OperatingMode::TRACKING) && amendmentBlocked_)
        om = OperatingMode::TRACKING;

    if (mMode == om)
        return;

    mMode = om;

    accounting_.mode(om);

    JLOG(m_journal.info()) << "STATE->" << strOperatingMode();
    pubServer();
}

std::string
NetworkOPsImp::transactionsSQL(
    std::string selection,
    AccountID const& account,
    std::int32_t minLedger,
    std::int32_t maxLedger,
    bool descending,
    std::uint32_t offset,
    int limit,
    bool binary,
    bool count,
    bool bUnlimited)
{
    std::uint32_t NONBINARY_PAGE_LENGTH = 200;
    std::uint32_t BINARY_PAGE_LENGTH = 500;

    std::uint32_t numberOfResults;

    if (count)
    {
        numberOfResults = 1000000000;
    }
    else if (limit < 0)
    {
        numberOfResults = binary ? BINARY_PAGE_LENGTH : NONBINARY_PAGE_LENGTH;
    }
    else if (!bUnlimited)
    {
        numberOfResults = std::min(
            binary ? BINARY_PAGE_LENGTH : NONBINARY_PAGE_LENGTH,
            static_cast<std::uint32_t>(limit));
    }
    else
    {
        numberOfResults = limit;
    }

    std::string maxClause = "";
    std::string minClause = "";

    if (maxLedger != -1)
    {
        maxClause = boost::str(
            boost::format("AND AccountTransactions.LedgerSeq <= '%u'") %
            maxLedger);
    }

    if (minLedger != -1)
    {
        minClause = boost::str(
            boost::format("AND AccountTransactions.LedgerSeq >= '%u'") %
            minLedger);
    }

    std::string sql;

    if (count)
        sql = boost::str(
            boost::format("SELECT %s FROM AccountTransactions "
                          "WHERE Account = '%s' %s %s LIMIT %u, %u;") %
            selection % app_.accountIDCache().toBase58(account) % maxClause %
            minClause % beast::lexicalCastThrow<std::string>(offset) %
            beast::lexicalCastThrow<std::string>(numberOfResults));
    else
        sql = boost::str(
            boost::format(
                "SELECT %s FROM "
                "AccountTransactions INNER JOIN Transactions "
                "ON Transactions.TransID = AccountTransactions.TransID "
                "WHERE Account = '%s' %s %s "
                "ORDER BY AccountTransactions.LedgerSeq %s, "
                "AccountTransactions.TxnSeq %s, AccountTransactions.TransID %s "
                "LIMIT %u, %u;") %
            selection % app_.accountIDCache().toBase58(account) % maxClause %
            minClause % (descending ? "DESC" : "ASC") %
            (descending ? "DESC" : "ASC") % (descending ? "DESC" : "ASC") %
            beast::lexicalCastThrow<std::string>(offset) %
            beast::lexicalCastThrow<std::string>(numberOfResults));
    JLOG(m_journal.trace()) << "txSQL query: " << sql;
    return sql;
}

NetworkOPs::AccountTxs
NetworkOPsImp::getAccountTxs(
    AccountID const& account,
    std::int32_t minLedger,
    std::int32_t maxLedger,
    bool descending,
    std::uint32_t offset,
    int limit,
    bool bUnlimited)
{
    // can be called with no locks
    AccountTxs ret;

    std::string sql = transactionsSQL(
        "AccountTransactions.LedgerSeq,Status,RawTxn,TxnMeta",
        account,
        minLedger,
        maxLedger,
        descending,
        offset,
        limit,
        false,
        false,
        bUnlimited);

    {
        auto db = app_.getTxnDB().checkoutDb();

        boost::optional<std::uint64_t> ledgerSeq;
        boost::optional<std::string> status;
        soci::blob sociTxnBlob(*db), sociTxnMetaBlob(*db);
        soci::indicator rti, tmi;
        Blob rawTxn, txnMeta;

        soci::statement st =
            (db->prepare << sql,
             soci::into(ledgerSeq),
             soci::into(status),
             soci::into(sociTxnBlob, rti),
             soci::into(sociTxnMetaBlob, tmi));

        st.execute();
        while (st.fetch())
        {
            if (soci::i_ok == rti)
                convert(sociTxnBlob, rawTxn);
            else
                rawTxn.clear();

            if (soci::i_ok == tmi)
                convert(sociTxnMetaBlob, txnMeta);
            else
                txnMeta.clear();

            auto txn = Transaction::transactionFromSQL(
                ledgerSeq, status, rawTxn, app_);

            if (txnMeta.empty())
            {  // Work around a bug that could leave the metadata missing
                auto const seq =
                    rangeCheckedCast<std::uint32_t>(ledgerSeq.value_or(0));

                JLOG(m_journal.warn())
                    << "Recovering ledger " << seq << ", txn " << txn->getID();

                if (auto l = m_ledgerMaster.getLedgerBySeq(seq))
                    pendSaveValidated(app_, l, false, false);
            }

            if (txn)
                ret.emplace_back(
                    txn,
                    std::make_shared<TxMeta>(
                        txn->getID(), txn->getLedger(), txnMeta));
        }
    }

    return ret;
}

std::vector<NetworkOPsImp::txnMetaLedgerType>
NetworkOPsImp::getAccountTxsB(
    AccountID const& account,
    std::int32_t minLedger,
    std::int32_t maxLedger,
    bool descending,
    std::uint32_t offset,
    int limit,
    bool bUnlimited)
{
    // can be called with no locks
    std::vector<txnMetaLedgerType> ret;

    std::string sql = transactionsSQL(
        "AccountTransactions.LedgerSeq,Status,RawTxn,TxnMeta",
        account,
        minLedger,
        maxLedger,
        descending,
        offset,
        limit,
        true /*binary*/,
        false,
        bUnlimited);

    {
        auto db = app_.getTxnDB().checkoutDb();

        boost::optional<std::uint64_t> ledgerSeq;
        boost::optional<std::string> status;
        soci::blob sociTxnBlob(*db), sociTxnMetaBlob(*db);
        soci::indicator rti, tmi;

        soci::statement st =
            (db->prepare << sql,
             soci::into(ledgerSeq),
             soci::into(status),
             soci::into(sociTxnBlob, rti),
             soci::into(sociTxnMetaBlob, tmi));

        st.execute();
        while (st.fetch())
        {
            Blob rawTxn;
            if (soci::i_ok == rti)
                convert(sociTxnBlob, rawTxn);
            Blob txnMeta;
            if (soci::i_ok == tmi)
                convert(sociTxnMetaBlob, txnMeta);

            auto const seq =
                rangeCheckedCast<std::uint32_t>(ledgerSeq.value_or(0));

            ret.emplace_back(std::move(rawTxn), std::move(txnMeta), seq);
        }
    }

    return ret;
}

NetworkOPsImp::AccountTxs
NetworkOPsImp::getTxsAccount(
    AccountID const& account,
    std::int32_t minLedger,
    std::int32_t maxLedger,
    bool forward,
    std::optional<AccountTxMarker>& marker,
    int limit,
    bool bUnlimited)
{
    static std::uint32_t const page_length(200);

    Application& app = app_;
    NetworkOPsImp::AccountTxs ret;

    auto bound = [&ret, &app](
                     std::uint32_t ledger_index,
                     std::string const& status,
                     Blob const& rawTxn,
                     Blob const& rawMeta) {
        convertBlobsToTxResult(ret, ledger_index, status, rawTxn, rawMeta, app);
    };

    accountTxPage(
        app_.getTxnDB(),
        app_.accountIDCache(),
        std::bind(saveLedgerAsync, std::ref(app_), std::placeholders::_1),
        bound,
        account,
        minLedger,
        maxLedger,
        forward,
        marker,
        limit,
        bUnlimited,
        page_length);

    return ret;
}

NetworkOPsImp::MetaTxsList
NetworkOPsImp::getTxsAccountB(
    AccountID const& account,
    std::int32_t minLedger,
    std::int32_t maxLedger,
    bool forward,
    std::optional<AccountTxMarker>& marker,
    int limit,
    bool bUnlimited)
{
    static const std::uint32_t page_length(500);

    MetaTxsList ret;

    auto bound = [&ret](
                     std::uint32_t ledgerIndex,
                     std::string const& status,
                     Blob const& rawTxn,
                     Blob const& rawMeta) {
        ret.emplace_back(std::move(rawTxn), std::move(rawMeta), ledgerIndex);
    };

    accountTxPage(
        app_.getTxnDB(),
        app_.accountIDCache(),
        std::bind(saveLedgerAsync, std::ref(app_), std::placeholders::_1),
        bound,
        account,
        minLedger,
        maxLedger,
        forward,
        marker,
        limit,
        bUnlimited,
        page_length);
    return ret;
}

bool
NetworkOPsImp::recvValidation(
    std::shared_ptr<STValidation> const& val,
    std::string const& source)
{
    JLOG(m_journal.debug())
        << "recvValidation " << val->getLedgerHash() << " from " << source;
    pubValidation(val);
    return handleNewValidation(app_, val, source);
}

Json::Value
NetworkOPsImp::getConsensusInfo()
{
    return mConsensus.getJson(true);
}

Json::Value
NetworkOPsImp::getServerInfo(bool human, bool admin, bool counters)
{
    Json::Value info = Json::objectValue;

    // System-level warnings
    {
        Json::Value warnings{Json::arrayValue};
        if (isAmendmentBlocked())
        {
            Json::Value& w = warnings.append(Json::objectValue);
            w[jss::id] = warnRPC_AMENDMENT_BLOCKED;
            w[jss::message] =
                "This server is amendment blocked, and must be updated to be "
                "able to stay in sync with the network.";
        }
        if (admin && isAmendmentWarned())
        {
            Json::Value& w = warnings.append(Json::objectValue);
            w[jss::id] = warnRPC_UNSUPPORTED_MAJORITY;
            w[jss::message] =
                "One or more unsupported amendments have reached majority. "
                "Upgrade to the latest version before they are activated "
                "to avoid being amendment blocked.";
            if (auto const expected =
                    app_.getAmendmentTable().firstUnsupportedExpected())
            {
                auto& d = w[jss::details] = Json::objectValue;
                d[jss::expected_date] = expected->time_since_epoch().count();
                d[jss::expected_date_UTC] = to_string(*expected);
            }
        }

        if (warnings.size())
            info[jss::warnings] = std::move(warnings);
    }

    // hostid: unique string describing the machine
    if (human)
        info[jss::hostid] = getHostId(admin);

    if (auto const netid = app_.overlay().networkID())
        info[jss::network_id] = static_cast<Json::UInt>(*netid);

    info[jss::build_version] = BuildInfo::getVersionString();

    info[jss::server_state] = strOperatingMode(admin);

    info[jss::time] = to_string(date::floor<std::chrono::microseconds>(
        std::chrono::system_clock::now()));

    if (needNetworkLedger_)
        info[jss::network_ledger] = "waiting";

    info[jss::validation_quorum] =
        static_cast<Json::UInt>(app_.validators().quorum());

    if (admin)
    {
        auto when = app_.validators().expires();

        if (!human)
        {
            if (when)
                info[jss::validator_list_expires] =
                    safe_cast<Json::UInt>(when->time_since_epoch().count());
            else
                info[jss::validator_list_expires] = 0;
        }
        else
        {
            auto& x = (info[jss::validator_list] = Json::objectValue);

            x[jss::count] = static_cast<Json::UInt>(app_.validators().count());

            if (when)
            {
                if (*when == TimeKeeper::time_point::max())
                {
                    x[jss::expiration] = "never";
                    x[jss::status] = "active";
                }
                else
                {
                    x[jss::expiration] = to_string(*when);

                    if (*when > app_.timeKeeper().now())
                        x[jss::status] = "active";
                    else
                        x[jss::status] = "expired";
                }
            }
            else
            {
                x[jss::status] = "unknown";
                x[jss::expiration] = "unknown";
            }
        }
    }
    info[jss::io_latency_ms] =
        static_cast<Json::UInt>(app_.getIOLatency().count());

    if (admin)
    {
        if (!app_.getValidationPublicKey().empty())
        {
            info[jss::pubkey_validator] = toBase58(
                TokenType::NodePublic, app_.validators().localPublicKey());
        }
        else
        {
            info[jss::pubkey_validator] = "none";
        }
    }

    if (counters)
    {
        info[jss::counters] = app_.getPerfLog().countersJson();
        info[jss::current_activities] = app_.getPerfLog().currentJson();
    }

    info[jss::pubkey_node] =
        toBase58(TokenType::NodePublic, app_.nodeIdentity().first);

    info[jss::complete_ledgers] = app_.getLedgerMaster().getCompleteLedgers();

    if (amendmentBlocked_)
        info[jss::amendment_blocked] = true;

    auto const fp = m_ledgerMaster.getFetchPackCacheSize();

    if (fp != 0)
        info[jss::fetch_pack] = Json::UInt(fp);

    info[jss::peers] = Json::UInt(app_.overlay().size());

    Json::Value lastClose = Json::objectValue;
    lastClose[jss::proposers] = Json::UInt(mConsensus.prevProposers());

    if (human)
    {
        lastClose[jss::converge_time_s] =
            std::chrono::duration<double>{mConsensus.prevRoundTime()}.count();
    }
    else
    {
        lastClose[jss::converge_time] =
            Json::Int(mConsensus.prevRoundTime().count());
    }

    info[jss::last_close] = lastClose;

    //  info[jss::consensus] = mConsensus.getJson();

    if (admin)
        info[jss::load] = m_job_queue.getJson();

    auto const escalationMetrics =
        app_.getTxQ().getMetrics(*app_.openLedger().current());

    auto const loadFactorServer = app_.getFeeTrack().getLoadFactor();
    auto const loadBaseServer = app_.getFeeTrack().getLoadBase();
    /* Scale the escalated fee level to unitless "load factor".
       In practice, this just strips the units, but it will continue
       to work correctly if either base value ever changes. */
    auto const loadFactorFeeEscalation =
        mulDiv(
            escalationMetrics.openLedgerFeeLevel,
            loadBaseServer,
            escalationMetrics.referenceFeeLevel)
            .second;

    auto const loadFactor = std::max(
        safe_cast<std::uint64_t>(loadFactorServer), loadFactorFeeEscalation);

    if (!human)
    {
        info[jss::load_base] = loadBaseServer;
        info[jss::load_factor] = trunc32(loadFactor);
        info[jss::load_factor_server] = loadFactorServer;

        /* Json::Value doesn't support uint64, so clamp to max
            uint32 value. This is mostly theoretical, since there
            probably isn't enough extant XRP to drive the factor
            that high.
        */
        info[jss::load_factor_fee_escalation] =
            escalationMetrics.openLedgerFeeLevel.jsonClipped();
        info[jss::load_factor_fee_queue] =
            escalationMetrics.minProcessingFeeLevel.jsonClipped();
        info[jss::load_factor_fee_reference] =
            escalationMetrics.referenceFeeLevel.jsonClipped();
    }
    else
    {
        info[jss::load_factor] =
            static_cast<double>(loadFactor) / loadBaseServer;

        if (loadFactorServer != loadFactor)
            info[jss::load_factor_server] =
                static_cast<double>(loadFactorServer) / loadBaseServer;

        if (admin)
        {
            std::uint32_t fee = app_.getFeeTrack().getLocalFee();
            if (fee != loadBaseServer)
                info[jss::load_factor_local] =
                    static_cast<double>(fee) / loadBaseServer;
            fee = app_.getFeeTrack().getRemoteFee();
            if (fee != loadBaseServer)
                info[jss::load_factor_net] =
                    static_cast<double>(fee) / loadBaseServer;
            fee = app_.getFeeTrack().getClusterFee();
            if (fee != loadBaseServer)
                info[jss::load_factor_cluster] =
                    static_cast<double>(fee) / loadBaseServer;
        }
        if (escalationMetrics.openLedgerFeeLevel !=
                escalationMetrics.referenceFeeLevel &&
            (admin || loadFactorFeeEscalation != loadFactor))
            info[jss::load_factor_fee_escalation] =
                escalationMetrics.openLedgerFeeLevel.decimalFromReference(
                    escalationMetrics.referenceFeeLevel);
        if (escalationMetrics.minProcessingFeeLevel !=
            escalationMetrics.referenceFeeLevel)
            info[jss::load_factor_fee_queue] =
                escalationMetrics.minProcessingFeeLevel.decimalFromReference(
                    escalationMetrics.referenceFeeLevel);
    }

    bool valid = false;
    auto lpClosed = m_ledgerMaster.getValidatedLedger();

    if (lpClosed)
        valid = true;
    else
        lpClosed = m_ledgerMaster.getClosedLedger();

    if (lpClosed)
    {
        XRPAmount const baseFee = lpClosed->fees().base;
        Json::Value l(Json::objectValue);
        l[jss::seq] = Json::UInt(lpClosed->info().seq);
        l[jss::hash] = to_string(lpClosed->info().hash);

        if (!human)
        {
            l[jss::base_fee] = baseFee.jsonClipped();
            l[jss::reserve_base] =
                lpClosed->fees().accountReserve(0).jsonClipped();
            l[jss::reserve_inc] = lpClosed->fees().increment.jsonClipped();
            l[jss::close_time] = Json::Value::UInt(
                lpClosed->info().closeTime.time_since_epoch().count());
        }
        else
        {
            l[jss::base_fee_xrp] = baseFee.decimalXRP();
            l[jss::reserve_base_xrp] =
                lpClosed->fees().accountReserve(0).decimalXRP();
            l[jss::reserve_inc_xrp] = lpClosed->fees().increment.decimalXRP();

            auto const nowOffset = app_.timeKeeper().nowOffset();
            if (std::abs(nowOffset.count()) >= 60)
                l[jss::system_time_offset] = nowOffset.count();

            auto const closeOffset = app_.timeKeeper().closeOffset();
            if (std::abs(closeOffset.count()) >= 60)
                l[jss::close_time_offset] = closeOffset.count();

            auto lCloseTime = lpClosed->info().closeTime;
            auto closeTime = app_.timeKeeper().closeTime();
            if (lCloseTime <= closeTime)
            {
                using namespace std::chrono_literals;
                auto age = closeTime - lCloseTime;
                if (age < 1000000s)
                    l[jss::age] = Json::UInt(age.count());
                else
                    l[jss::age] = 0;
            }
        }

        if (valid)
            info[jss::validated_ledger] = l;
        else
            info[jss::closed_ledger] = l;

        auto lpPublished = m_ledgerMaster.getPublishedLedger();
        if (!lpPublished)
            info[jss::published_ledger] = "none";
        else if (lpPublished->info().seq != lpClosed->info().seq)
            info[jss::published_ledger] = lpPublished->info().seq;
    }

    std::tie(info[jss::state_accounting], info[jss::server_state_duration_us]) =
        accounting_.json();
    info[jss::uptime] = UptimeClock::now().time_since_epoch().count();
    info[jss::jq_trans_overflow] =
        std::to_string(app_.overlay().getJqTransOverflow());
    info[jss::peer_disconnects] =
        std::to_string(app_.overlay().getPeerDisconnect());
    info[jss::peer_disconnects_resources] =
        std::to_string(app_.overlay().getPeerDisconnectCharges());

    return info;
}

void
NetworkOPsImp::clearLedgerFetch()
{
    app_.getInboundLedgers().clearFailures();
}

Json::Value
NetworkOPsImp::getLedgerFetchInfo()
{
    return app_.getInboundLedgers().getInfo();
}

void
NetworkOPsImp::pubProposedTransaction(
    std::shared_ptr<ReadView const> const& lpCurrent,
    std::shared_ptr<STTx const> const& stTxn,
    TER terResult)
{
    Json::Value jvObj = transJson(*stTxn, terResult, false, lpCurrent);

    {
        std::lock_guard sl(mSubLock);

        auto it = mStreamMaps[sRTTransactions].begin();
        while (it != mStreamMaps[sRTTransactions].end())
        {
            InfoSub::pointer p = it->second.lock();

            if (p)
            {
                p->send(jvObj, true);
                ++it;
            }
            else
            {
                it = mStreamMaps[sRTTransactions].erase(it);
            }
        }
    }
    AcceptedLedgerTx alt(
        lpCurrent, stTxn, terResult, app_.accountIDCache(), app_.logs());
    JLOG(m_journal.trace()) << "pubProposed: " << alt.getJson();
    pubAccountTransaction(lpCurrent, alt, false);
}

void
NetworkOPsImp::pubLedger(std::shared_ptr<ReadView const> const& lpAccepted)
{
    // Ledgers are published only when they acquire sufficient validations
    // Holes are filled across connection loss or other catastrophe

    std::shared_ptr<AcceptedLedger> alpAccepted =
        app_.getAcceptedLedgerCache().fetch(lpAccepted->info().hash);
    if (!alpAccepted)
    {
        alpAccepted = std::make_shared<AcceptedLedger>(
            lpAccepted, app_.accountIDCache(), app_.logs());
        app_.getAcceptedLedgerCache().canonicalize_replace_client(
            lpAccepted->info().hash, alpAccepted);
    }

    {
        std::lock_guard sl(mSubLock);

        if (!mStreamMaps[sLedger].empty())
        {
            Json::Value jvObj(Json::objectValue);

            jvObj[jss::type] = "ledgerClosed";
            jvObj[jss::ledger_index] = lpAccepted->info().seq;
            jvObj[jss::ledger_hash] = to_string(lpAccepted->info().hash);
            jvObj[jss::ledger_time] = Json::Value::UInt(
                lpAccepted->info().closeTime.time_since_epoch().count());

            jvObj[jss::fee_ref] = lpAccepted->fees().units.jsonClipped();
            jvObj[jss::fee_base] = lpAccepted->fees().base.jsonClipped();
            jvObj[jss::reserve_base] =
                lpAccepted->fees().accountReserve(0).jsonClipped();
            jvObj[jss::reserve_inc] =
                lpAccepted->fees().increment.jsonClipped();

            jvObj[jss::txn_count] = Json::UInt(alpAccepted->getTxnCount());

            if (mMode >= OperatingMode::SYNCING)
            {
                jvObj[jss::validated_ledgers] =
                    app_.getLedgerMaster().getCompleteLedgers();
            }

            auto it = mStreamMaps[sLedger].begin();
            while (it != mStreamMaps[sLedger].end())
            {
                InfoSub::pointer p = it->second.lock();
                if (p)
                {
                    p->send(jvObj, true);
                    ++it;
                }
                else
                    it = mStreamMaps[sLedger].erase(it);
            }
        }
    }

    // Don't lock since pubAcceptedTransaction is locking.
    for (auto const& [_, accTx] : alpAccepted->getMap())
    {
        (void)_;
        JLOG(m_journal.trace()) << "pubAccepted: " << accTx->getJson();
        pubValidatedTransaction(lpAccepted, *accTx);
    }
}

void
NetworkOPsImp::reportFeeChange()
{
    ServerFeeSummary f{
        app_.openLedger().current()->fees().base,
        app_.getTxQ().getMetrics(*app_.openLedger().current()),
        app_.getFeeTrack()};

    // only schedule the job if something has changed
    if (f != mLastFeeSummary)
    {
        m_job_queue.addJob(
            jtCLIENT, "reportFeeChange->pubServer", [this](Job&) {
                pubServer();
            });
    }
}

void
NetworkOPsImp::reportConsensusStateChange(ConsensusPhase phase)
{
    m_job_queue.addJob(
        jtCLIENT,
        "reportConsensusStateChange->pubConsensus",
        [this, phase](Job&) { pubConsensus(phase); });
}

// This routine should only be used to publish accepted or validated
// transactions.
Json::Value
NetworkOPsImp::transJson(
    const STTx& stTxn,
    TER terResult,
    bool bValidated,
    std::shared_ptr<ReadView const> const& lpCurrent)
{
    Json::Value jvObj(Json::objectValue);
    std::string sToken;
    std::string sHuman;

    transResultInfo(terResult, sToken, sHuman);

    jvObj[jss::type] = "transaction";
    jvObj[jss::transaction] = stTxn.getJson(JsonOptions::none);

    if (bValidated)
    {
        jvObj[jss::ledger_index] = lpCurrent->info().seq;
        jvObj[jss::ledger_hash] = to_string(lpCurrent->info().hash);
        jvObj[jss::transaction][jss::date] =
            lpCurrent->info().closeTime.time_since_epoch().count();
        jvObj[jss::validated] = true;

        // WRITEME: Put the account next seq here
    }
    else
    {
        jvObj[jss::validated] = false;
        jvObj[jss::ledger_current_index] = lpCurrent->info().seq;
    }

    jvObj[jss::status] = bValidated ? "closed" : "proposed";
    jvObj[jss::engine_result] = sToken;
    jvObj[jss::engine_result_code] = terResult;
    jvObj[jss::engine_result_message] = sHuman;

    if (stTxn.getTxnType() == ttOFFER_CREATE)
    {
        auto const account = stTxn.getAccountID(sfAccount);
        auto const amount = stTxn.getFieldAmount(sfTakerGets);

        // If the offer create is not self funded then add the owner balance
        if (account != amount.issue().account)
        {
            auto const ownerFunds = accountFunds(
                *lpCurrent,
                account,
                amount,
                fhIGNORE_FREEZE,
                app_.journal("View"));
            jvObj[jss::transaction][jss::owner_funds] = ownerFunds.getText();
        }
    }

    return jvObj;
}

void
NetworkOPsImp::pubValidatedTransaction(
    std::shared_ptr<ReadView const> const& alAccepted,
    const AcceptedLedgerTx& alTx)
{
    std::shared_ptr<STTx const> stTxn = alTx.getTxn();
    Json::Value jvObj = transJson(*stTxn, alTx.getResult(), true, alAccepted);

    if (auto const txMeta = alTx.getMeta())
    {
        jvObj[jss::meta] = txMeta->getJson(JsonOptions::none);
        RPC::insertDeliveredAmount(
            jvObj[jss::meta], *alAccepted, stTxn, *txMeta);
    }

    {
        std::lock_guard sl(mSubLock);

        auto it = mStreamMaps[sTransactions].begin();
        while (it != mStreamMaps[sTransactions].end())
        {
            InfoSub::pointer p = it->second.lock();

            if (p)
            {
                p->send(jvObj, true);
                ++it;
            }
            else
                it = mStreamMaps[sTransactions].erase(it);
        }

        it = mStreamMaps[sRTTransactions].begin();

        while (it != mStreamMaps[sRTTransactions].end())
        {
            InfoSub::pointer p = it->second.lock();

            if (p)
            {
                p->send(jvObj, true);
                ++it;
            }
            else
                it = mStreamMaps[sRTTransactions].erase(it);
        }
    }
    app_.getOrderBookDB().processTxn(alAccepted, alTx, jvObj);
    pubAccountTransaction(alAccepted, alTx, true);
}

void
NetworkOPsImp::pubAccountTransaction(
    std::shared_ptr<ReadView const> const& lpCurrent,
    const AcceptedLedgerTx& alTx,
    bool bAccepted)
{
    hash_set<InfoSub::pointer> notify;
    int iProposed = 0;
    int iAccepted = 0;

    {
        std::lock_guard sl(mSubLock);

        if (!bAccepted && mSubRTAccount.empty())
            return;

        if (!mSubAccount.empty() || (!mSubRTAccount.empty()))
        {
            for (auto const& affectedAccount : alTx.getAffected())
            {
                auto simiIt = mSubRTAccount.find(affectedAccount);
                if (simiIt != mSubRTAccount.end())
                {
                    auto it = simiIt->second.begin();

                    while (it != simiIt->second.end())
                    {
                        InfoSub::pointer p = it->second.lock();

                        if (p)
                        {
                            notify.insert(p);
                            ++it;
                            ++iProposed;
                        }
                        else
                            it = simiIt->second.erase(it);
                    }
                }

                if (bAccepted)
                {
                    simiIt = mSubAccount.find(affectedAccount);

                    if (simiIt != mSubAccount.end())
                    {
                        auto it = simiIt->second.begin();
                        while (it != simiIt->second.end())
                        {
                            InfoSub::pointer p = it->second.lock();

                            if (p)
                            {
                                notify.insert(p);
                                ++it;
                                ++iAccepted;
                            }
                            else
                                it = simiIt->second.erase(it);
                        }
                    }
                }
            }
        }
    }
    JLOG(m_journal.trace())
        << "pubAccountTransaction:"
        << " iProposed=" << iProposed << " iAccepted=" << iAccepted;

    if (!notify.empty())
    {
        std::shared_ptr<STTx const> stTxn = alTx.getTxn();
        Json::Value jvObj =
            transJson(*stTxn, alTx.getResult(), bAccepted, lpCurrent);

        if (alTx.isApplied())
        {
            if (auto const txMeta = alTx.getMeta())
            {
                jvObj[jss::meta] = txMeta->getJson(JsonOptions::none);
                RPC::insertDeliveredAmount(
                    jvObj[jss::meta], *lpCurrent, stTxn, *txMeta);
            }
        }

        for (InfoSub::ref isrListener : notify)
            isrListener->send(jvObj, true);
    }
}

//
// Monitoring
//

void
NetworkOPsImp::subAccount(
    InfoSub::ref isrListener,
    hash_set<AccountID> const& vnaAccountIDs,
    bool rt)
{
    SubInfoMapType& subMap = rt ? mSubRTAccount : mSubAccount;

    for (auto const& naAccountID : vnaAccountIDs)
    {
        JLOG(m_journal.trace())
            << "subAccount: account: " << toBase58(naAccountID);

        isrListener->insertSubAccountInfo(naAccountID, rt);
    }

    std::lock_guard sl(mSubLock);

    for (auto const& naAccountID : vnaAccountIDs)
    {
        auto simIterator = subMap.find(naAccountID);
        if (simIterator == subMap.end())
        {
            // Not found, note that account has a new single listner.
            SubMapType usisElement;
            usisElement[isrListener->getSeq()] = isrListener;
            // VFALCO NOTE This is making a needless copy of naAccountID
            subMap.insert(simIterator, make_pair(naAccountID, usisElement));
        }
        else
        {
            // Found, note that the account has another listener.
            simIterator->second[isrListener->getSeq()] = isrListener;
        }
    }
}

void
NetworkOPsImp::unsubAccount(
    InfoSub::ref isrListener,
    hash_set<AccountID> const& vnaAccountIDs,
    bool rt)
{
    for (auto const& naAccountID : vnaAccountIDs)
    {
        // Remove from the InfoSub
        isrListener->deleteSubAccountInfo(naAccountID, rt);
    }

    // Remove from the server
    unsubAccountInternal(isrListener->getSeq(), vnaAccountIDs, rt);
}

void
NetworkOPsImp::unsubAccountInternal(
    std::uint64_t uSeq,
    hash_set<AccountID> const& vnaAccountIDs,
    bool rt)
{
    std::lock_guard sl(mSubLock);

    SubInfoMapType& subMap = rt ? mSubRTAccount : mSubAccount;

    for (auto const& naAccountID : vnaAccountIDs)
    {
        auto simIterator = subMap.find(naAccountID);

        if (simIterator != subMap.end())
        {
            // Found
            simIterator->second.erase(uSeq);

            if (simIterator->second.empty())
            {
                // Don't need hash entry.
                subMap.erase(simIterator);
            }
        }
    }
}

bool
NetworkOPsImp::subBook(InfoSub::ref isrListener, Book const& book)
{
    if (auto listeners = app_.getOrderBookDB().makeBookListeners(book))
        listeners->addSubscriber(isrListener);
    else
        assert(false);
    return true;
}

bool
NetworkOPsImp::unsubBook(std::uint64_t uSeq, Book const& book)
{
    if (auto listeners = app_.getOrderBookDB().getBookListeners(book))
        listeners->removeSubscriber(uSeq);

    return true;
}

std::uint32_t
NetworkOPsImp::acceptLedger(
    boost::optional<std::chrono::milliseconds> consensusDelay)
{
    // This code-path is exclusively used when the server is in standalone
    // mode via `ledger_accept`
    assert(m_standalone);

    if (!m_standalone)
        Throw<std::runtime_error>(
            "Operation only possible in STANDALONE mode.");

    // FIXME Could we improve on this and remove the need for a specialized
    // API in Consensus?
    beginConsensus(m_ledgerMaster.getClosedLedger()->info().hash);
    mConsensus.simulate(app_.timeKeeper().closeTime(), consensusDelay);
    return m_ledgerMaster.getCurrentLedger()->info().seq;
}

// <-- bool: true=added, false=already there
bool
NetworkOPsImp::subLedger(InfoSub::ref isrListener, Json::Value& jvResult)
{
    if (auto lpClosed = m_ledgerMaster.getValidatedLedger())
    {
        jvResult[jss::ledger_index] = lpClosed->info().seq;
        jvResult[jss::ledger_hash] = to_string(lpClosed->info().hash);
        jvResult[jss::ledger_time] = Json::Value::UInt(
            lpClosed->info().closeTime.time_since_epoch().count());
        jvResult[jss::fee_ref] = lpClosed->fees().units.jsonClipped();
        jvResult[jss::fee_base] = lpClosed->fees().base.jsonClipped();
        jvResult[jss::reserve_base] =
            lpClosed->fees().accountReserve(0).jsonClipped();
        jvResult[jss::reserve_inc] = lpClosed->fees().increment.jsonClipped();
    }

    if ((mMode >= OperatingMode::SYNCING) && !isNeedNetworkLedger())
    {
        jvResult[jss::validated_ledgers] =
            app_.getLedgerMaster().getCompleteLedgers();
    }

    std::lock_guard sl(mSubLock);
    return mStreamMaps[sLedger]
        .emplace(isrListener->getSeq(), isrListener)
        .second;
}

// <-- bool: true=erased, false=was not there
bool
NetworkOPsImp::unsubLedger(std::uint64_t uSeq)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sLedger].erase(uSeq);
}

// <-- bool: true=added, false=already there
bool
NetworkOPsImp::subManifests(InfoSub::ref isrListener)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sManifests]
        .emplace(isrListener->getSeq(), isrListener)
        .second;
}

// <-- bool: true=erased, false=was not there
bool
NetworkOPsImp::unsubManifests(std::uint64_t uSeq)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sManifests].erase(uSeq);
}

// <-- bool: true=added, false=already there
bool
NetworkOPsImp::subServer(
    InfoSub::ref isrListener,
    Json::Value& jvResult,
    bool admin)
{
    uint256 uRandom;

    if (m_standalone)
        jvResult[jss::stand_alone] = m_standalone;

    // CHECKME: is it necessary to provide a random number here?
    beast::rngfill(uRandom.begin(), uRandom.size(), crypto_prng());

    auto const& feeTrack = app_.getFeeTrack();
    jvResult[jss::random] = to_string(uRandom);
    jvResult[jss::server_status] = strOperatingMode(admin);
    jvResult[jss::load_base] = feeTrack.getLoadBase();
    jvResult[jss::load_factor] = feeTrack.getLoadFactor();
    jvResult[jss::hostid] = getHostId(admin);
    jvResult[jss::pubkey_node] =
        toBase58(TokenType::NodePublic, app_.nodeIdentity().first);

    std::lock_guard sl(mSubLock);
    return mStreamMaps[sServer]
        .emplace(isrListener->getSeq(), isrListener)
        .second;
}

// <-- bool: true=erased, false=was not there
bool
NetworkOPsImp::unsubServer(std::uint64_t uSeq)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sServer].erase(uSeq);
}

// <-- bool: true=added, false=already there
bool
NetworkOPsImp::subTransactions(InfoSub::ref isrListener)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sTransactions]
        .emplace(isrListener->getSeq(), isrListener)
        .second;
}

// <-- bool: true=erased, false=was not there
bool
NetworkOPsImp::unsubTransactions(std::uint64_t uSeq)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sTransactions].erase(uSeq);
}

// <-- bool: true=added, false=already there
bool
NetworkOPsImp::subRTTransactions(InfoSub::ref isrListener)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sRTTransactions]
        .emplace(isrListener->getSeq(), isrListener)
        .second;
}

// <-- bool: true=erased, false=was not there
bool
NetworkOPsImp::unsubRTTransactions(std::uint64_t uSeq)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sRTTransactions].erase(uSeq);
}

// <-- bool: true=added, false=already there
bool
NetworkOPsImp::subValidations(InfoSub::ref isrListener)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sValidations]
        .emplace(isrListener->getSeq(), isrListener)
        .second;
}

// <-- bool: true=erased, false=was not there
bool
NetworkOPsImp::unsubValidations(std::uint64_t uSeq)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sValidations].erase(uSeq);
}

// <-- bool: true=added, false=already there
bool
NetworkOPsImp::subPeerStatus(InfoSub::ref isrListener)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sPeerStatus]
        .emplace(isrListener->getSeq(), isrListener)
        .second;
}

// <-- bool: true=erased, false=was not there
bool
NetworkOPsImp::unsubPeerStatus(std::uint64_t uSeq)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sPeerStatus].erase(uSeq);
}

// <-- bool: true=added, false=already there
bool
NetworkOPsImp::subConsensus(InfoSub::ref isrListener)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sConsensusPhase]
        .emplace(isrListener->getSeq(), isrListener)
        .second;
}

// <-- bool: true=erased, false=was not there
bool
NetworkOPsImp::unsubConsensus(std::uint64_t uSeq)
{
    std::lock_guard sl(mSubLock);
    return mStreamMaps[sConsensusPhase].erase(uSeq);
}

InfoSub::pointer
NetworkOPsImp::findRpcSub(std::string const& strUrl)
{
    std::lock_guard sl(mSubLock);

    subRpcMapType::iterator it = mRpcSubMap.find(strUrl);

    if (it != mRpcSubMap.end())
        return it->second;

    return InfoSub::pointer();
}

InfoSub::pointer
NetworkOPsImp::addRpcSub(std::string const& strUrl, InfoSub::ref rspEntry)
{
    std::lock_guard sl(mSubLock);

    mRpcSubMap.emplace(strUrl, rspEntry);

    return rspEntry;
}

bool
NetworkOPsImp::tryRemoveRpcSub(std::string const& strUrl)
{
    std::lock_guard sl(mSubLock);
    auto pInfo = findRpcSub(strUrl);

    if (!pInfo)
        return false;

    // check to see if any of the stream maps still hold a weak reference to
    // this entry before removing
    for (SubMapType const& map : mStreamMaps)
    {
        if (map.find(pInfo->getSeq()) != map.end())
            return false;
    }
    mRpcSubMap.erase(strUrl);
    return true;
}

#ifndef USE_NEW_BOOK_PAGE

// NIKB FIXME this should be looked at. There's no reason why this shouldn't
//            work, but it demonstrated poor performance.
//
void
NetworkOPsImp::getBookPage(
    std::shared_ptr<ReadView const>& lpLedger,
    Book const& book,
    AccountID const& uTakerID,
    bool const bProof,
    unsigned int iLimit,
    Json::Value const& jvMarker,
    Json::Value& jvResult)
{  // CAUTION: This is the old get book page logic
    Json::Value& jvOffers =
        (jvResult[jss::offers] = Json::Value(Json::arrayValue));

    std::map<AccountID, STAmount> umBalance;
    const uint256 uBookBase = getBookBase(book);
    const uint256 uBookEnd = getQualityNext(uBookBase);
    uint256 uTipIndex = uBookBase;

    if (auto stream = m_journal.trace())
    {
        stream << "getBookPage:" << book;
        stream << "getBookPage: uBookBase=" << uBookBase;
        stream << "getBookPage: uBookEnd=" << uBookEnd;
        stream << "getBookPage: uTipIndex=" << uTipIndex;
    }

    ReadView const& view = *lpLedger;

    bool const bGlobalFreeze = isGlobalFrozen(view, book.out.account) ||
        isGlobalFrozen(view, book.in.account);

    bool bDone = false;
    bool bDirectAdvance = true;

    std::shared_ptr<SLE const> sleOfferDir;
    uint256 offerIndex;
    unsigned int uBookEntry;
    STAmount saDirRate;

    auto const rate = transferRate(view, book.out.account);
    auto viewJ = app_.journal("View");

    while (!bDone && iLimit-- > 0)
    {
        if (bDirectAdvance)
        {
            bDirectAdvance = false;

            JLOG(m_journal.trace()) << "getBookPage: bDirectAdvance";

            auto const ledgerIndex = view.succ(uTipIndex, uBookEnd);
            if (ledgerIndex)
                sleOfferDir = view.read(keylet::page(*ledgerIndex));
            else
                sleOfferDir.reset();

            if (!sleOfferDir)
            {
                JLOG(m_journal.trace()) << "getBookPage: bDone";
                bDone = true;
            }
            else
            {
                uTipIndex = sleOfferDir->key();
                saDirRate = amountFromQuality(getQuality(uTipIndex));

                cdirFirst(
                    view,
                    uTipIndex,
                    sleOfferDir,
                    uBookEntry,
                    offerIndex,
                    viewJ);

                JLOG(m_journal.trace())
                    << "getBookPage:   uTipIndex=" << uTipIndex;
                JLOG(m_journal.trace())
                    << "getBookPage: offerIndex=" << offerIndex;
            }
        }

        if (!bDone)
        {
            auto sleOffer = view.read(keylet::offer(offerIndex));

            if (sleOffer)
            {
                auto const uOfferOwnerID = sleOffer->getAccountID(sfAccount);
                auto const& saTakerGets = sleOffer->getFieldAmount(sfTakerGets);
                auto const& saTakerPays = sleOffer->getFieldAmount(sfTakerPays);
                STAmount saOwnerFunds;
                bool firstOwnerOffer(true);

                if (book.out.account == uOfferOwnerID)
                {
                    // If an offer is selling issuer's own IOUs, it is fully
                    // funded.
                    saOwnerFunds = saTakerGets;
                }
                else if (bGlobalFreeze)
                {
                    // If either asset is globally frozen, consider all offers
                    // that aren't ours to be totally unfunded
                    saOwnerFunds.clear(book.out);
                }
                else
                {
                    auto umBalanceEntry = umBalance.find(uOfferOwnerID);
                    if (umBalanceEntry != umBalance.end())
                    {
                        // Found in running balance table.

                        saOwnerFunds = umBalanceEntry->second;
                        firstOwnerOffer = false;
                    }
                    else
                    {
                        // Did not find balance in table.

                        saOwnerFunds = accountHolds(
                            view,
                            uOfferOwnerID,
                            book.out.currency,
                            book.out.account,
                            fhZERO_IF_FROZEN,
                            viewJ);

                        if (saOwnerFunds < beast::zero)
                        {
                            // Treat negative funds as zero.

                            saOwnerFunds.clear();
                        }
                    }
                }

                Json::Value jvOffer = sleOffer->getJson(JsonOptions::none);

                STAmount saTakerGetsFunded;
                STAmount saOwnerFundsLimit = saOwnerFunds;
                Rate offerRate = parityRate;

                if (rate != parityRate
                    // Have a tranfer fee.
                    && uTakerID != book.out.account
                    // Not taking offers of own IOUs.
                    && book.out.account != uOfferOwnerID)
                // Offer owner not issuing ownfunds
                {
                    // Need to charge a transfer fee to offer owner.
                    offerRate = rate;
                    saOwnerFundsLimit = divide(saOwnerFunds, offerRate);
                }

                if (saOwnerFundsLimit >= saTakerGets)
                {
                    // Sufficient funds no shenanigans.
                    saTakerGetsFunded = saTakerGets;
                }
                else
                {
                    // Only provide, if not fully funded.

                    saTakerGetsFunded = saOwnerFundsLimit;

                    saTakerGetsFunded.setJson(jvOffer[jss::taker_gets_funded]);
                    std::min(
                        saTakerPays,
                        multiply(
                            saTakerGetsFunded, saDirRate, saTakerPays.issue()))
                        .setJson(jvOffer[jss::taker_pays_funded]);
                }

                STAmount saOwnerPays = (parityRate == offerRate)
                    ? saTakerGetsFunded
                    : std::min(
                          saOwnerFunds, multiply(saTakerGetsFunded, offerRate));

                umBalance[uOfferOwnerID] = saOwnerFunds - saOwnerPays;

                // Include all offers funded and unfunded
                Json::Value& jvOf = jvOffers.append(jvOffer);
                jvOf[jss::quality] = saDirRate.getText();

                if (firstOwnerOffer)
                    jvOf[jss::owner_funds] = saOwnerFunds.getText();
            }
            else
            {
                JLOG(m_journal.warn()) << "Missing offer";
            }

            if (!cdirNext(
                    view,
                    uTipIndex,
                    sleOfferDir,
                    uBookEntry,
                    offerIndex,
                    viewJ))
            {
                bDirectAdvance = true;
            }
            else
            {
                JLOG(m_journal.trace())
                    << "getBookPage: offerIndex=" << offerIndex;
            }
        }
    }

    //  jvResult[jss::marker]  = Json::Value(Json::arrayValue);
    //  jvResult[jss::nodes]   = Json::Value(Json::arrayValue);
}

#else

// This is the new code that uses the book iterators
// It has temporarily been disabled

void
NetworkOPsImp::getBookPage(
    std::shared_ptr<ReadView const> lpLedger,
    Book const& book,
    AccountID const& uTakerID,
    bool const bProof,
    unsigned int iLimit,
    Json::Value const& jvMarker,
    Json::Value& jvResult)
{
    auto& jvOffers = (jvResult[jss::offers] = Json::Value(Json::arrayValue));

    std::map<AccountID, STAmount> umBalance;

    MetaView lesActive(lpLedger, tapNONE, true);
    OrderBookIterator obIterator(lesActive, book);

    auto const rate = transferRate(lesActive, book.out.account);

    const bool bGlobalFreeze = lesActive.isGlobalFrozen(book.out.account) ||
        lesActive.isGlobalFrozen(book.in.account);

    while (iLimit-- > 0 && obIterator.nextOffer())
    {
        SLE::pointer sleOffer = obIterator.getCurrentOffer();
        if (sleOffer)
        {
            auto const uOfferOwnerID = sleOffer->getAccountID(sfAccount);
            auto const& saTakerGets = sleOffer->getFieldAmount(sfTakerGets);
            auto const& saTakerPays = sleOffer->getFieldAmount(sfTakerPays);
            STAmount saDirRate = obIterator.getCurrentRate();
            STAmount saOwnerFunds;

            if (book.out.account == uOfferOwnerID)
            {
                // If offer is selling issuer's own IOUs, it is fully funded.
                saOwnerFunds = saTakerGets;
            }
            else if (bGlobalFreeze)
            {
                // If either asset is globally frozen, consider all offers
                // that aren't ours to be totally unfunded
                saOwnerFunds.clear(book.out);
            }
            else
            {
                auto umBalanceEntry = umBalance.find(uOfferOwnerID);

                if (umBalanceEntry != umBalance.end())
                {
                    // Found in running balance table.

                    saOwnerFunds = umBalanceEntry->second;
                }
                else
                {
                    // Did not find balance in table.

                    saOwnerFunds = lesActive.accountHolds(
                        uOfferOwnerID,
                        book.out.currency,
                        book.out.account,
                        fhZERO_IF_FROZEN);

                    if (saOwnerFunds.isNegative())
                    {
                        // Treat negative funds as zero.

                        saOwnerFunds.zero();
                    }
                }
            }

            Json::Value jvOffer = sleOffer->getJson(JsonOptions::none);

            STAmount saTakerGetsFunded;
            STAmount saOwnerFundsLimit = saOwnerFunds;
            Rate offerRate = parityRate;

            if (rate != parityRate
                // Have a tranfer fee.
                && uTakerID != book.out.account
                // Not taking offers of own IOUs.
                && book.out.account != uOfferOwnerID)
            // Offer owner not issuing ownfunds
            {
                // Need to charge a transfer fee to offer owner.
                offerRate = rate;
                saOwnerFundsLimit = divide(saOwnerFunds, offerRate);
            }

            if (saOwnerFundsLimit >= saTakerGets)
            {
                // Sufficient funds no shenanigans.
                saTakerGetsFunded = saTakerGets;
            }
            else
            {
                // Only provide, if not fully funded.
                saTakerGetsFunded = saOwnerFundsLimit;

                saTakerGetsFunded.setJson(jvOffer[jss::taker_gets_funded]);

                // TOOD(tom): The result of this expression is not used - what's
                // going on here?
                std::min(
                    saTakerPays,
                    multiply(saTakerGetsFunded, saDirRate, saTakerPays.issue()))
                    .setJson(jvOffer[jss::taker_pays_funded]);
            }

            STAmount saOwnerPays = (parityRate == offerRate)
                ? saTakerGetsFunded
                : std::min(
                      saOwnerFunds, multiply(saTakerGetsFunded, offerRate));

            umBalance[uOfferOwnerID] = saOwnerFunds - saOwnerPays;

            if (!saOwnerFunds.isZero() || uOfferOwnerID == uTakerID)
            {
                // Only provide funded offers and offers of the taker.
                Json::Value& jvOf = jvOffers.append(jvOffer);
                jvOf[jss::quality] = saDirRate.getText();
            }
        }
    }

    //  jvResult[jss::marker]  = Json::Value(Json::arrayValue);
    //  jvResult[jss::nodes]   = Json::Value(Json::arrayValue);
}

#endif

//------------------------------------------------------------------------------

NetworkOPs::NetworkOPs(Stoppable& parent)
    : InfoSub::Source("NetworkOPs", parent)
{
}

//------------------------------------------------------------------------------

void
NetworkOPsImp::StateAccounting::mode(OperatingMode om)
{
    auto now = std::chrono::system_clock::now();

    std::lock_guard lock(mutex_);
    ++counters_[static_cast<std::size_t>(om)].transitions;
    counters_[static_cast<std::size_t>(mode_)].dur +=
        std::chrono::duration_cast<std::chrono::microseconds>(now - start_);

    mode_ = om;
    start_ = now;
}

NetworkOPsImp::StateAccounting::StateCountersJson
NetworkOPsImp::StateAccounting::json() const
{
    auto [counters, mode, start] = getCounterData();
    auto const current = std::chrono::duration_cast<std::chrono::microseconds>(
        std::chrono::system_clock::now() - start);
    counters[static_cast<std::size_t>(mode)].dur += current;

    Json::Value ret = Json::objectValue;

    for (std::size_t i = static_cast<std::size_t>(OperatingMode::DISCONNECTED);
         i <= static_cast<std::size_t>(OperatingMode::FULL);
         ++i)
    {
        ret[states_[i]] = Json::objectValue;
        auto& state = ret[states_[i]];
        state[jss::transitions] = counters[i].transitions;
        state[jss::duration_us] = std::to_string(counters[i].dur.count());
    }

    return {ret, std::to_string(current.count())};
}

//------------------------------------------------------------------------------

std::unique_ptr<NetworkOPs>
make_NetworkOPs(
    Application& app,
    NetworkOPs::clock_type& clock,
    bool standalone,
    std::size_t minPeerCount,
    bool startvalid,
    JobQueue& job_queue,
    LedgerMaster& ledgerMaster,
    Stoppable& parent,
    ValidatorKeys const& validatorKeys,
    boost::asio::io_service& io_svc,
    beast::Journal journal,
    beast::insight::Collector::ptr const& collector)
{
    return std::make_unique<NetworkOPsImp>(
        app,
        clock,
        standalone,
        minPeerCount,
        startvalid,
        job_queue,
        ledgerMaster,
        parent,
        validatorKeys,
        io_svc,
        journal,
        collector);
}

}  // namespace ripple