ServerInfo.hpp

//------------------------------------------------------------------------------
/*
    This file is part of clio: https://github.com/XRPLF/clio
    Copyright (c) 2023, the clio developers.
 
    Permission to use, copy, modify, and 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.
*/
//==============================================================================
 
#pragma once
 
#include "data/BackendInterface.hpp"
#include "data/DBHelpers.hpp"
#include "etl/ETLServiceInterface.hpp"
#include "etl/LoadBalancerInterface.hpp"
#include "feed/SubscriptionManagerInterface.hpp"
#include "rpc/Errors.hpp"
#include "rpc/JS.hpp"
#include "rpc/common/Specs.hpp"
#include "rpc/common/Types.hpp"
#include "util/Assert.hpp"
#include "util/build/Build.hpp"
 
#include <boost/json/conversion.hpp>
#include <boost/json/object.hpp>
#include <boost/json/value.hpp>
#include <fmt/format.h>
#include <xrpl/basics/chrono.h>
#include <xrpl/basics/strHex.h>
#include <xrpl/protocol/BuildInfo.h>
#include <xrpl/protocol/ErrorCodes.h>
#include <xrpl/protocol/Fees.h>
#include <xrpl/protocol/Protocol.h>
#include <xrpl/protocol/jss.h>
 
#include <chrono>
#include <cstddef>
#include <cstdint>
#include <functional>
#include <memory>
#include <optional>
#include <string>
 
namespace rpc {
class Counters;
}  // namespace rpc
 
namespace rpc {

template <typename CountersType>
class BaseServerInfoHandler {
    static constexpr auto kBACKEND_COUNTERS_KEY = "backend_counters";
 
    std::shared_ptr<BackendInterface> backend_;
    std::shared_ptr<feed::SubscriptionManagerInterface> subscriptions_;
    std::shared_ptr<etl::LoadBalancerInterface> balancer_;
    std::shared_ptr<etl::ETLServiceInterface const> etl_;
    std::reference_wrapper<CountersType const> counters_;
 
public:
    struct Input {
        bool backendCounters = false;
    };

    struct AdminSection {
        boost::json::object counters;
        std::optional<boost::json::object> backendCounters;
        boost::json::object subscriptions;
        boost::json::object etl;
    };

    struct ValidatedLedgerSection {
        uint32_t age = 0;
        std::string hash;
        ripple::LedgerIndex seq = {};
        std::optional<ripple::Fees> fees = std::nullopt;
    };

    struct CacheSection {
        std::size_t size = 0;
        bool isEnabled = false;
        bool isFull = false;
        ripple::LedgerIndex latestLedgerSeq = {};
        float objectHitRate = 1.0;
        float successorHitRate = 1.0;
    };

    struct InfoSection {
        std::optional<AdminSection> adminSection = std::nullopt;
        std::string completeLedgers;
        uint32_t loadFactor = 1u;
        std::chrono::time_point<std::chrono::system_clock> time = std::chrono::system_clock::now();
        std::chrono::seconds uptime = {};
        std::string clioVersion = util::build::getClioVersionString();
        std::string xrplVersion = ripple::BuildInfo::getVersionString();
        std::optional<boost::json::object> rippledInfo = std::nullopt;
        ValidatedLedgerSection validatedLedger = {};
        CacheSection cache = {};
        bool isAmendmentBlocked = false;
        bool isCorruptionDetected = false;
    };

    struct Output {
        InfoSection info = {};
 
        // validated should be sent via framework
        bool validated = true;
    };
 
    using Result = HandlerReturnType<Output>;

    BaseServerInfoHandler(
        std::shared_ptr<BackendInterface> const& backend,
        std::shared_ptr<feed::SubscriptionManagerInterface> const& subscriptions,
        std::shared_ptr<etl::LoadBalancerInterface> const& balancer,
        std::shared_ptr<etl::ETLServiceInterface const> const& etl,
        CountersType const& counters
    )
        : backend_(backend)
        , subscriptions_(subscriptions)
        , balancer_(balancer)
        , etl_(etl)
        , counters_(std::cref(counters))
    {
    }

    static RpcSpecConstRef
    spec([[maybe_unused]] uint32_t apiVersion)
    {
        static RpcSpec const kRPC_SPEC = {};
        return kRPC_SPEC;
    }

    Result
    process(Input const& input, Context const& ctx) const
    {
        using namespace rpc;
        using namespace std::chrono;
 
        auto const range = backend_->fetchLedgerRange();
        ASSERT(range.has_value(), "ServerInfo's ledger range must be available");
 
        auto const lgrInfo = backend_->fetchLedgerBySequence(range->maxSequence, ctx.yield);
        if (not lgrInfo.has_value())
            return Error{Status{RippledError::rpcINTERNAL}};
 
        auto const fees = backend_->fetchFees(lgrInfo->seq, ctx.yield);
        if (not fees.has_value())
            return Error{Status{RippledError::rpcINTERNAL}};
 
        auto output = Output{};
        auto const sinceEpoch =
            duration_cast<seconds>(system_clock::now().time_since_epoch()).count();
        auto const age = static_cast<int32_t>(sinceEpoch) -
            static_cast<int32_t>(lgrInfo->closeTime.time_since_epoch().count()) -
            static_cast<int32_t>(kRIPPLE_EPOCH_START);
 
        output.info.completeLedgers = fmt::format("{}-{}", range->minSequence, range->maxSequence);
 
        if (ctx.isAdmin) {
            output.info.adminSection = {
                .counters = counters_.get().report(),
                .backendCounters =
                    input.backendCounters ? std::make_optional(backend_->stats()) : std::nullopt,
                .subscriptions = subscriptions_->report(),
                .etl = etl_->getInfo()
            };
        }
 
        auto const serverInfoRippled = balancer_->forwardToRippled(
            {{"command", "server_info"}}, ctx.clientIp, ctx.isAdmin, ctx.yield
        );
 
        if (serverInfoRippled && !serverInfoRippled->contains(JS(error))) {
            if (serverInfoRippled->contains(JS(result)) &&
                serverInfoRippled->at(JS(result)).as_object().contains(JS(info))) {
                output.info.rippledInfo =
                    serverInfoRippled->at(JS(result)).as_object().at(JS(info)).as_object();
            }
        }
 
        output.info.validatedLedger.age = age < 0 ? 0 : age;
        output.info.validatedLedger.hash = ripple::strHex(lgrInfo->hash);
        output.info.validatedLedger.seq = lgrInfo->seq;
        output.info.validatedLedger.fees = fees;
        output.info.cache.size = backend_->cache().size();
        output.info.cache.isFull = backend_->cache().isFull();
        output.info.cache.latestLedgerSeq = backend_->cache().latestLedgerSequence();
        output.info.cache.objectHitRate = backend_->cache().getObjectHitRate();
        output.info.cache.successorHitRate = backend_->cache().getSuccessorHitRate();
        output.info.cache.isEnabled = not backend_->cache().isDisabled();
        output.info.uptime = counters_.get().uptime();
        output.info.isAmendmentBlocked = etl_->isAmendmentBlocked();
        output.info.isCorruptionDetected = etl_->isCorruptionDetected();
 
        return output;
    }
 
private:
    friend void
    tag_invoke(boost::json::value_from_tag, boost::json::value& jv, Output const& output)
    {
        using boost::json::value_from;
 
        jv = {
            {JS(info), value_from(output.info)},
            {JS(validated), output.validated},
        };
    }
 
    friend void
    tag_invoke(boost::json::value_from_tag, boost::json::value& jv, InfoSection const& info)
    {
        using boost::json::value_from;
        using ripple::to_string;
 
        jv = {
            {JS(complete_ledgers), info.completeLedgers},
            {JS(load_factor), info.loadFactor},
            {JS(time), to_string(std::chrono::floor<std::chrono::microseconds>(info.time))},
            {JS(uptime), info.uptime.count()},
            {"clio_version", info.clioVersion},
            {"libxrpl_version", info.xrplVersion},
            {JS(validated_ledger), value_from(info.validatedLedger)},
            {"cache", value_from(info.cache)},
        };
 
        if (info.isAmendmentBlocked)
            jv.as_object()[JS(amendment_blocked)] = true;
 
        if (info.isCorruptionDetected)
            jv.as_object()["corruption_detected"] = true;
 
        if (info.rippledInfo) {
            auto const& rippledInfo = info.rippledInfo.value();
 
            if (rippledInfo.contains(JS(load_factor)))
                jv.as_object()[JS(load_factor)] = rippledInfo.at(JS(load_factor));
            if (rippledInfo.contains(JS(validation_quorum)))
                jv.as_object()[JS(validation_quorum)] = rippledInfo.at(JS(validation_quorum));
            if (rippledInfo.contains(JS(build_version)))
                jv.as_object()["rippled_version"] = rippledInfo.at(JS(build_version));
            if (rippledInfo.contains(JS(network_id)))
                jv.as_object()[JS(network_id)] = rippledInfo.at(JS(network_id));
        }
 
        if (info.adminSection) {
            jv.as_object()["etl"] = info.adminSection->etl;
            jv.as_object()[JS(counters)] = info.adminSection->counters;
            jv.as_object()[JS(counters)].as_object()["subscriptions"] =
                info.adminSection->subscriptions;
            if (info.adminSection->backendCounters.has_value()) {
                jv.as_object()[kBACKEND_COUNTERS_KEY] = *info.adminSection->backendCounters;
            }
        }
    }
 
    friend void
    tag_invoke(
        boost::json::value_from_tag,
        boost::json::value& jv,
        ValidatedLedgerSection const& validated
    )
    {
        jv = {
            {JS(age), validated.age},
            {JS(hash), validated.hash},
            {JS(seq), validated.seq},
            {JS(base_fee_xrp), validated.fees->base.decimalXRP()},
            {JS(reserve_base_xrp), validated.fees->reserve.decimalXRP()},
            {JS(reserve_inc_xrp), validated.fees->increment.decimalXRP()},
        };
    }
 
    friend void
    tag_invoke(boost::json::value_from_tag, boost::json::value& jv, CacheSection const& cache)
    {
        jv = {
            {"size", cache.size},
            {"is_enabled", cache.isEnabled},
            {"is_full", cache.isFull},
            {"latest_ledger_seq", cache.latestLedgerSeq},
            {"object_hit_rate", cache.objectHitRate},
            {"successor_hit_rate", cache.successorHitRate},
        };
    }
 
    friend Input
    tag_invoke(boost::json::value_to_tag<Input>, boost::json::value const& jv)
    {
        auto input = BaseServerInfoHandler::Input{};
        auto const jsonObject = jv.as_object();
        if (jsonObject.contains(kBACKEND_COUNTERS_KEY) &&
            jsonObject.at(kBACKEND_COUNTERS_KEY).is_bool())
            input.backendCounters = jv.at(kBACKEND_COUNTERS_KEY).as_bool();
        return input;
    }
};

using ServerInfoHandler = BaseServerInfoHandler<Counters>;
 
}  // namespace rpc