bitcoin-cli.cpp

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif
 
#include <chainparamsbase.h>
#include <clientversion.h>
#include <common/args.h>
#include <common/system.h>
#include <currencyunit.h>
#include <rpc/client.h>
#include <rpc/mining.h>
#include <rpc/protocol.h>
#include <rpc/request.h>
#include <support/events.h>
#include <tinyformat.h>
#include <util/exception.h>
#include <util/strencodings.h>
#include <util/string.h>
#include <util/time.h>
#include <util/translation.h>
 
#include <event2/buffer.h>
#include <event2/keyvalq_struct.h>
 
#include <compat/stdin.h>
#include <univalue.h>
 
#include <algorithm>
#include <chrono>
#include <cmath>
#include <cstdio>
#include <functional>
#include <memory>
#include <string>
#include <tuple>
 
// The server returns time values from a mockable system clock, but it is not
// trivial to get the mocked time from the server, nor is it needed for now, so
// just use a plain system_clock.
using CliClock = std::chrono::system_clock;
 
const std::function<std::string(const char *)> G_TRANSLATION_FUN = nullptr;
 
static const char DEFAULT_RPCCONNECT[] = "127.0.0.1";
static const int DEFAULT_HTTP_CLIENT_TIMEOUT = 900;
static const bool DEFAULT_NAMED = false;
static const int CONTINUE_EXECUTION = -1;
static const std::string DEFAULT_NBLOCKS = "1";
 
static void SetupCliArgs(ArgsManager &argsman) {
    SetupHelpOptions(argsman);
 
    const auto defaultBaseParams =
        CreateBaseChainParams(CBaseChainParams::MAIN);
    const auto testnetBaseParams =
        CreateBaseChainParams(CBaseChainParams::TESTNET);
    const auto regtestBaseParams =
        CreateBaseChainParams(CBaseChainParams::REGTEST);
 
    SetupCurrencyUnitOptions(argsman);
    argsman.AddArg("-version", "Print version and exit", ArgsManager::ALLOW_ANY,
                   OptionsCategory::OPTIONS);
    argsman.AddArg(
        "-conf=<file>",
        strprintf("Specify configuration file. Relative paths will be "
                  "prefixed by datadir location. (default: %s)",
                  BITCOIN_CONF_FILENAME),
        ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg("-datadir=<dir>", "Specify data directory",
                   ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg(
        "-generate",
        strprintf(
            "Generate blocks immediately, equivalent to RPC getnewaddress "
            "followed by RPC generatetoaddress. Optional positional integer "
            "arguments are number of blocks to generate (default: %s) and "
            "maximum iterations to try (default: %s), equivalent to RPC "
            "generatetoaddress nblocks and maxtries arguments. Example: "
            "bitcoin-cli -generate 4 1000",
            DEFAULT_NBLOCKS, DEFAULT_MAX_TRIES),
        ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg(
        "-getinfo",
        "Get general information from the remote server. Note that unlike "
        "server-side RPC calls, the results of -getinfo is the result of "
        "multiple non-atomic requests. Some entries in the result may "
        "represent results from different states (e.g. wallet balance may be "
        "as of a different block from the chain state reported)",
        ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg("-netinfo",
                   "Get network peer connection information from the remote "
                   "server. An optional integer argument from 0 to 4 can be "
                   "passed for different peers listings (default: 0).",
                   ArgsManager::ALLOW_INT, OptionsCategory::OPTIONS);
 
    SetupChainParamsBaseOptions(argsman);
    argsman.AddArg(
        "-named",
        strprintf("Pass named instead of positional arguments (default: %s)",
                  DEFAULT_NAMED),
        ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg(
        "-rpcconnect=<ip>",
        strprintf("Send commands to node running on <ip> (default: %s)",
                  DEFAULT_RPCCONNECT),
        ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg(
        "-rpccookiefile=<loc>",
        "Location of the auth cookie. Relative paths will be prefixed "
        "by a net-specific datadir location. (default: data dir)",
        ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg("-rpcport=<port>",
                   strprintf("Connect to JSON-RPC on <port> (default: %u, "
                             "testnet: %u, regtest: %u)",
                             defaultBaseParams->RPCPort(),
                             testnetBaseParams->RPCPort(),
                             regtestBaseParams->RPCPort()),
                   ArgsManager::ALLOW_ANY | ArgsManager::NETWORK_ONLY,
                   OptionsCategory::OPTIONS);
    argsman.AddArg("-rpcwait", "Wait for RPC server to start",
                   ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg("-rpcuser=<user>", "Username for JSON-RPC connections",
                   ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg("-rpcpassword=<pw>", "Password for JSON-RPC connections",
                   ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg(
        "-rpcclienttimeout=<n>",
        strprintf("Timeout in seconds during HTTP requests, or 0 for "
                  "no timeout. (default: %d)",
                  DEFAULT_HTTP_CLIENT_TIMEOUT),
        ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
 
    argsman.AddArg("-stdinrpcpass",
                   "Read RPC password from standard input as a single "
                   "line. When combined with -stdin, the first line "
                   "from standard input is used for the RPC password. When "
                   "combined with -stdinwalletpassphrase, -stdinrpcpass "
                   "consumes the first line, and -stdinwalletpassphrase "
                   "consumes the second.",
                   ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg("-stdinwalletpassphrase",
                   "Read wallet passphrase from standard input as a single "
                   "line. When combined with -stdin, the first line "
                   "from standard input is used for the wallet passphrase.",
                   ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg(
        "-stdin",
        "Read extra arguments from standard input, one per line until "
        "EOF/Ctrl-D (recommended for sensitive information such as "
        "passphrases). When combined with -stdinrpcpass, the first "
        "line from standard input is used for the RPC password.",
        ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
    argsman.AddArg(
        "-rpcwallet=<walletname>",
        "Send RPC for non-default wallet on RPC server (needs to exactly match "
        "corresponding -wallet option passed to bitcoind). This changes the "
        "RPC endpoint used, e.g. http://127.0.0.1:8332/wallet/<walletname>",
        ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
}
 
static void libevent_log_cb(int severity, const char *msg) {
#ifndef EVENT_LOG_ERR
// EVENT_LOG_ERR was added in 2.0.19; but before then _EVENT_LOG_ERR existed.
#define EVENT_LOG_ERR _EVENT_LOG_ERR
#endif
    // Ignore everything other than errors
    if (severity >= EVENT_LOG_ERR) {
        throw std::runtime_error(strprintf("libevent error: %s", msg));
    }
}
 
//
// Start
//
 
//
// Exception thrown on connection error.  This error is used to determine when
// to wait if -rpcwait is given.
//
class CConnectionFailed : public std::runtime_error {
public:
    explicit inline CConnectionFailed(const std::string &msg)
        : std::runtime_error(msg) {}
};
 
//
// This function returns either one of EXIT_ codes when it's expected to stop
// the process or CONTINUE_EXECUTION when it's expected to continue further.
//
static int AppInitRPC(int argc, char *argv[]) {
    //
    // Parameters
    //
    SetupCliArgs(gArgs);
    std::string error;
    if (!gArgs.ParseParameters(argc, argv, error)) {
        tfm::format(std::cerr, "Error parsing command line arguments: %s\n",
                    error);
        return EXIT_FAILURE;
    }
    if (argc < 2 || HelpRequested(gArgs) || gArgs.IsArgSet("-version")) {
        std::string strUsage =
            PACKAGE_NAME " RPC client version " + FormatFullVersion() + "\n";
 
        if (gArgs.IsArgSet("-version")) {
            strUsage += FormatParagraph(LicenseInfo());
        } else {
            strUsage += "\n"
                        "Usage:  bitcoin-cli [options] <command> [params]  "
                        "Send command to " PACKAGE_NAME "\n"
                        "or:     bitcoin-cli [options] -named <command> "
                        "[name=value]...  Send command to " PACKAGE_NAME
                        " (with named arguments)\n"
                        "or:     bitcoin-cli [options] help                "
                        "List commands\n"
                        "or:     bitcoin-cli [options] help <command>      Get "
                        "help for a command\n";
 
            strUsage += "\n" + gArgs.GetHelpMessage();
        }
 
        tfm::format(std::cout, "%s", strUsage);
        if (argc < 2) {
            tfm::format(std::cerr, "Error: too few parameters\n");
            return EXIT_FAILURE;
        }
        return EXIT_SUCCESS;
    }
    if (!CheckDataDirOption(gArgs)) {
        tfm::format(std::cerr,
                    "Error: Specified data directory \"%s\" does not exist.\n",
                    gArgs.GetArg("-datadir", ""));
        return EXIT_FAILURE;
    }
    if (!gArgs.ReadConfigFiles(error, true)) {
        tfm::format(std::cerr, "Error reading configuration file: %s\n", error);
        return EXIT_FAILURE;
    }
    // Check for -chain, -testnet or -regtest parameter (BaseParams() calls are
    // only valid after this clause)
    try {
        SelectBaseParams(gArgs.GetChainName());
    } catch (const std::exception &e) {
        tfm::format(std::cerr, "Error: %s\n", e.what());
        return EXIT_FAILURE;
    }
    return CONTINUE_EXECUTION;
}
 
struct HTTPReply {
    HTTPReply() : status(0), error(-1) {}
 
    int status;
    int error;
    std::string body;
};
 
static std::string http_errorstring(int code) {
    switch (code) {
#if LIBEVENT_VERSION_NUMBER >= 0x02010300
        case EVREQ_HTTP_TIMEOUT:
            return "timeout reached";
        case EVREQ_HTTP_EOF:
            return "EOF reached";
        case EVREQ_HTTP_INVALID_HEADER:
            return "error while reading header, or invalid header";
        case EVREQ_HTTP_BUFFER_ERROR:
            return "error encountered while reading or writing";
        case EVREQ_HTTP_REQUEST_CANCEL:
            return "request was canceled";
        case EVREQ_HTTP_DATA_TOO_LONG:
            return "response body is larger than allowed";
#endif
        default:
            return "unknown";
    }
}
 
static void http_request_done(struct evhttp_request *req, void *ctx) {
    HTTPReply *reply = static_cast<HTTPReply *>(ctx);
 
    if (req == nullptr) {
        reply->status = 0;
        return;
    }
 
    reply->status = evhttp_request_get_response_code(req);
 
    struct evbuffer *buf = evhttp_request_get_input_buffer(req);
    if (buf) {
        size_t size = evbuffer_get_length(buf);
        const char *data = (const char *)evbuffer_pullup(buf, size);
        if (data) {
            reply->body = std::string(data, size);
        }
        evbuffer_drain(buf, size);
    }
}
 
#if LIBEVENT_VERSION_NUMBER >= 0x02010300
static void http_error_cb(enum evhttp_request_error err, void *ctx) {
    HTTPReply *reply = static_cast<HTTPReply *>(ctx);
    reply->error = err;
}
#endif
 
class BaseRequestHandler {
public:
    virtual ~BaseRequestHandler() {}
    virtual UniValue PrepareRequest(const std::string &method,
                                    const std::vector<std::string> &args) = 0;
    virtual UniValue ProcessReply(const UniValue &batch_in) = 0;
};
 
class GetinfoRequestHandler : public BaseRequestHandler {
public:
    const int ID_NETWORKINFO = 0;
    const int ID_BLOCKCHAININFO = 1;
    const int ID_WALLETINFO = 2;
    const int ID_BALANCES = 3;
 
    UniValue PrepareRequest(const std::string &method,
                            const std::vector<std::string> &args) override {
        if (!args.empty()) {
            throw std::runtime_error("-getinfo takes no arguments");
        }
        UniValue result(UniValue::VARR);
        result.push_back(
            JSONRPCRequestObj("getnetworkinfo", NullUniValue, ID_NETWORKINFO));
        result.push_back(JSONRPCRequestObj("getblockchaininfo", NullUniValue,
                                           ID_BLOCKCHAININFO));
        result.push_back(
            JSONRPCRequestObj("getwalletinfo", NullUniValue, ID_WALLETINFO));
        result.push_back(
            JSONRPCRequestObj("getbalances", NullUniValue, ID_BALANCES));
        return result;
    }
 
    UniValue ProcessReply(const UniValue &batch_in) override {
        UniValue result(UniValue::VOBJ);
        const std::vector<UniValue> batch = JSONRPCProcessBatchReply(batch_in);
        // Errors in getnetworkinfo() and getblockchaininfo() are fatal, pass
        // them on; getwalletinfo() and getbalances are allowed to fail if there
        // is no wallet.
        if (!batch[ID_NETWORKINFO]["error"].isNull()) {
            return batch[ID_NETWORKINFO];
        }
        if (!batch[ID_BLOCKCHAININFO]["error"].isNull()) {
            return batch[ID_BLOCKCHAININFO];
        }
        result.pushKV("version", batch[ID_NETWORKINFO]["result"]["version"]);
        result.pushKV("blocks", batch[ID_BLOCKCHAININFO]["result"]["blocks"]);
        result.pushKV("headers", batch[ID_BLOCKCHAININFO]["result"]["headers"]);
        result.pushKV(
            "verificationprogress",
            batch[ID_BLOCKCHAININFO]["result"]["verificationprogress"]);
        result.pushKV("timeoffset",
                      batch[ID_NETWORKINFO]["result"]["timeoffset"]);
 
        UniValue connections(UniValue::VOBJ);
        connections.pushKV("in",
                           batch[ID_NETWORKINFO]["result"]["connections_in"]);
        connections.pushKV("out",
                           batch[ID_NETWORKINFO]["result"]["connections_out"]);
        connections.pushKV("total",
                           batch[ID_NETWORKINFO]["result"]["connections"]);
        result.pushKV("connections", connections);
 
        result.pushKV("proxy",
                      batch[ID_NETWORKINFO]["result"]["networks"][0]["proxy"]);
        result.pushKV("difficulty",
                      batch[ID_BLOCKCHAININFO]["result"]["difficulty"]);
        result.pushKV("chain",
                      UniValue(batch[ID_BLOCKCHAININFO]["result"]["chain"]));
        if (!batch[ID_WALLETINFO]["result"].isNull()) {
            result.pushKV("keypoolsize",
                          batch[ID_WALLETINFO]["result"]["keypoolsize"]);
            if (!batch[ID_WALLETINFO]["result"]["unlocked_until"].isNull()) {
                result.pushKV("unlocked_until",
                              batch[ID_WALLETINFO]["result"]["unlocked_until"]);
            }
            result.pushKV("paytxfee",
                          batch[ID_WALLETINFO]["result"]["paytxfee"]);
        }
        if (!batch[ID_BALANCES]["result"].isNull()) {
            result.pushKV("balance",
                          batch[ID_BALANCES]["result"]["mine"]["trusted"]);
        }
        result.pushKV("relayfee", batch[ID_NETWORKINFO]["result"]["relayfee"]);
        result.pushKV("warnings", batch[ID_NETWORKINFO]["result"]["warnings"]);
        return JSONRPCReplyObj(result, NullUniValue, 1);
    }
};
 
class NetinfoRequestHandler : public BaseRequestHandler {
private:
    static constexpr int8_t UNKNOWN_NETWORK{-1};
    static constexpr uint8_t m_networks_size{3};
    const std::array<std::string, m_networks_size> m_networks{
        {"ipv4", "ipv6", "onion"}};
    std::array<std::array<uint16_t, m_networks_size + 2>, 3> m_counts{{{}}};
    int8_t NetworkStringToId(const std::string &str) const {
        for (uint8_t i = 0; i < m_networks_size; ++i) {
            if (str == m_networks.at(i)) {
                return i;
            }
        }
        return UNKNOWN_NETWORK;
    }
    uint8_t m_details_level{0};
    bool DetailsRequested() const {
        return m_details_level > 0 && m_details_level < 5;
    }
    bool IsAddressSelected() const {
        return m_details_level == 2 || m_details_level == 4;
    }
    bool IsVersionSelected() const {
        return m_details_level == 3 || m_details_level == 4;
    }
    bool m_is_asmap_on{false};
    size_t m_max_addr_length{0};
    size_t m_max_age_length{4};
    size_t m_max_id_length{2};
    struct Peer {
        std::string addr;
        std::string sub_version;
        std::string network;
        std::string age;
        double min_ping;
        double ping;
        int64_t last_blck;
        int64_t last_recv;
        int64_t last_send;
        int64_t last_trxn;
        int id;
        int mapped_as;
        int version;
        bool is_block_relay;
        bool is_outbound;
        bool operator<(const Peer &rhs) const {
            return std::tie(is_outbound, min_ping) <
                   std::tie(rhs.is_outbound, rhs.min_ping);
        }
    };
    std::vector<Peer> m_peers;
    std::string ChainToString() const {
        if (gArgs.GetChainName() == CBaseChainParams::TESTNET) {
            return " testnet";
        }
        if (gArgs.GetChainName() == CBaseChainParams::REGTEST) {
            return " regtest";
        }
        return "";
    }
    std::string PingTimeToString(double seconds) const {
        if (seconds < 0) {
            return "";
        }
        const double milliseconds{round(1000 * seconds)};
        return milliseconds > 999999 ? "-" : ToString(milliseconds);
    }
    const int64_t m_time_now{
        TicksSinceEpoch<std::chrono::seconds>(CliClock::now())};
 
public:
    static constexpr int ID_PEERINFO = 0;
    static constexpr int ID_NETWORKINFO = 1;
 
    UniValue PrepareRequest(const std::string &method,
                            const std::vector<std::string> &args) override {
        if (!args.empty()) {
            uint8_t n{0};
            if (ParseUInt8(args.at(0), &n)) {
                m_details_level = n;
            }
        }
        UniValue result(UniValue::VARR);
        result.push_back(
            JSONRPCRequestObj("getpeerinfo", NullUniValue, ID_PEERINFO));
        result.push_back(
            JSONRPCRequestObj("getnetworkinfo", NullUniValue, ID_NETWORKINFO));
        return result;
    }
 
    UniValue ProcessReply(const UniValue &batch_in) override {
        const std::vector<UniValue> batch{JSONRPCProcessBatchReply(batch_in)};
        if (!batch[ID_PEERINFO]["error"].isNull()) {
            return batch[ID_PEERINFO];
        }
        if (!batch[ID_NETWORKINFO]["error"].isNull()) {
            return batch[ID_NETWORKINFO];
        }
 
        const UniValue &networkinfo{batch[ID_NETWORKINFO]["result"]};
        if (networkinfo["version"].getInt<int>() < 230000) {
            throw std::runtime_error("-netinfo requires bitcoind server to be "
                                     "running v0.23.0 and up");
        }
 
        // Count peer connection totals, and if DetailsRequested(), store peer
        // data in a vector of structs.
        for (const UniValue &peer : batch[ID_PEERINFO]["result"].getValues()) {
            const std::string network{peer["network"].get_str()};
            const int8_t network_id{NetworkStringToId(network)};
            if (network_id == UNKNOWN_NETWORK) {
                continue;
            }
            const bool is_outbound{!peer["inbound"].get_bool()};
            const bool is_block_relay{!peer["relaytxes"].get_bool()};
            // in/out by network
            ++m_counts.at(is_outbound).at(network_id);
            // in/out overall
            ++m_counts.at(is_outbound).at(m_networks_size);
            // total by network
            ++m_counts.at(2).at(network_id);
            // total overall
            ++m_counts.at(2).at(m_networks_size);
            if (is_block_relay) {
                // in/out block-relay
                ++m_counts.at(is_outbound).at(m_networks_size + 1);
                // total block-relay
                ++m_counts.at(2).at(m_networks_size + 1);
            }
            if (DetailsRequested()) {
                // Push data for this peer to the peers vector.
                const int peer_id{peer["id"].getInt<int>()};
                const int mapped_as{peer["mapped_as"].isNull()
                                        ? 0
                                        : peer["mapped_as"].getInt<int>()};
                const int version{peer["version"].getInt<int>()};
                const int64_t conn_time{peer["conntime"].getInt<int64_t>()};
                const int64_t last_blck{peer["last_block"].getInt<int64_t>()};
                const int64_t last_recv{peer["lastrecv"].getInt<int64_t>()};
                const int64_t last_send{peer["lastsend"].getInt<int64_t>()};
                const int64_t last_trxn{
                    peer["last_transaction"].getInt<int64_t>()};
                const double min_ping{
                    peer["minping"].isNull() ? -1 : peer["minping"].get_real()};
                const double ping{peer["pingtime"].isNull()
                                      ? -1
                                      : peer["pingtime"].get_real()};
                const std::string addr{peer["addr"].get_str()};
                const std::string age{
                    conn_time == 0 ? ""
                                   : ToString((m_time_now - conn_time) / 60)};
                const std::string sub_version{peer["subver"].get_str()};
                m_peers.push_back({addr, sub_version, network, age, min_ping,
                                   ping, last_blck, last_recv, last_send,
                                   last_trxn, peer_id, mapped_as, version,
                                   is_block_relay, is_outbound});
                m_max_addr_length =
                    std::max(addr.length() + 1, m_max_addr_length);
                m_max_age_length = std::max(age.length(), m_max_age_length);
                m_max_id_length =
                    std::max(ToString(peer_id).length(), m_max_id_length);
                m_is_asmap_on |= (mapped_as != 0);
            }
        }
 
        // Generate report header.
        std::string result{strprintf(
            "%s %s%s - %i%s\n\n", PACKAGE_NAME, FormatFullVersion(),
            ChainToString(), networkinfo["protocolversion"].getInt<int>(),
            networkinfo["subversion"].get_str())};
 
        // Report detailed peer connections list sorted by direction and minimum
        // ping time.
        if (DetailsRequested() && !m_peers.empty()) {
            std::sort(m_peers.begin(), m_peers.end());
            result += strprintf(
                "Peer connections sorted by direction and min ping\n<-> relay  "
                " net  mping   ping send recv  txn  blk %*s ",
                m_max_age_length, "age");
            if (m_is_asmap_on) {
                result += " asmap ";
            }
            result += strprintf("%*s %-*s%s\n", m_max_id_length, "id",
                                IsAddressSelected() ? m_max_addr_length : 0,
                                IsAddressSelected() ? "address" : "",
                                IsVersionSelected() ? "version" : "");
            for (const Peer &peer : m_peers) {
                std::string version{ToString(peer.version) + peer.sub_version};
                result += strprintf(
                    "%3s %5s %5s%7s%7s%5s%5s%5s%5s %*s%*i %*s %-*s%s\n",
                    peer.is_outbound ? "out" : "in",
                    peer.is_block_relay ? "block" : "full", peer.network,
                    PingTimeToString(peer.min_ping),
                    PingTimeToString(peer.ping),
                    peer.last_send == 0 ? ""
                                        : ToString(m_time_now - peer.last_send),
                    peer.last_recv == 0 ? ""
                                        : ToString(m_time_now - peer.last_recv),
                    peer.last_trxn == 0
                        ? ""
                        : ToString((m_time_now - peer.last_trxn) / 60),
                    peer.last_blck == 0
                        ? ""
                        : ToString((m_time_now - peer.last_blck) / 60),
                    // variable spacing
                    m_max_age_length, peer.age,
                    // variable spacing
                    m_is_asmap_on ? 7 : 0,
                    m_is_asmap_on && peer.mapped_as != 0
                        ? ToString(peer.mapped_as)
                        : "",
                    // variable spacing
                    m_max_id_length, peer.id,
                    // variable spacing
                    IsAddressSelected() ? m_max_addr_length : 0,
                    IsAddressSelected() ? peer.addr : "",
                    IsVersionSelected() && version != "0" ? version : "");
            }
            result += strprintf(
                "                    ms     ms  sec  sec  min  min %*s\n\n",
                m_max_age_length, "min");
        }
 
        // Report peer connection totals by type.
        result += "        ipv4    ipv6   onion   total  block-relay\n";
        const std::array<std::string, 3> rows{{"in", "out", "total"}};
        for (uint8_t i = 0; i < m_networks_size; ++i) {
            result += strprintf("%-5s  %5i   %5i   %5i   %5i   %5i\n",
                                rows.at(i), m_counts.at(i).at(0),
                                m_counts.at(i).at(1), m_counts.at(i).at(2),
                                m_counts.at(i).at(m_networks_size),
                                m_counts.at(i).at(m_networks_size + 1));
        }
 
        // Report local addresses, ports, and scores.
        result += "\nLocal addresses";
        const std::vector<UniValue> &local_addrs{
            networkinfo["localaddresses"].getValues()};
        if (local_addrs.empty()) {
            result += ": n/a\n";
        } else {
            size_t max_addr_size{0};
            for (const UniValue &addr : local_addrs) {
                max_addr_size = std::max(addr["address"].get_str().length() + 1,
                                         max_addr_size);
            }
            for (const UniValue &addr : local_addrs) {
                result += strprintf("\n%-*s    port %6i    score %6i",
                                    max_addr_size, addr["address"].get_str(),
                                    addr["port"].getInt<int>(),
                                    addr["score"].getInt<int>());
            }
        }
 
        return JSONRPCReplyObj(UniValue{result}, NullUniValue, 1);
    }
};
 
class GenerateToAddressRequestHandler : public BaseRequestHandler {
public:
    UniValue PrepareRequest(const std::string &method,
                            const std::vector<std::string> &args) override {
        address_str = args.at(1);
        UniValue params{RPCConvertValues("generatetoaddress", args)};
        return JSONRPCRequestObj("generatetoaddress", params, 1);
    }
 
    UniValue ProcessReply(const UniValue &reply) override {
        UniValue result(UniValue::VOBJ);
        result.pushKV("address", address_str);
        result.pushKV("blocks", reply.get_obj()["result"]);
        return JSONRPCReplyObj(result, NullUniValue, 1);
    }
 
protected:
    std::string address_str;
};
 
class DefaultRequestHandler : public BaseRequestHandler {
public:
    UniValue PrepareRequest(const std::string &method,
                            const std::vector<std::string> &args) override {
        UniValue params;
        if (gArgs.GetBoolArg("-named", DEFAULT_NAMED)) {
            params = RPCConvertNamedValues(method, args);
        } else {
            params = RPCConvertValues(method, args);
        }
        return JSONRPCRequestObj(method, params, 1);
    }
 
    UniValue ProcessReply(const UniValue &reply) override {
        return reply.get_obj();
    }
};
 
static UniValue CallRPC(BaseRequestHandler *rh, const std::string &strMethod,
                        const std::vector<std::string> &args,
                        const std::optional<std::string> &rpcwallet = {}) {
    std::string host;
    // In preference order, we choose the following for the port:
    //     1. -rpcport
    //     2. port in -rpcconnect (ie following : in ipv4 or ]: in ipv6)
    //     3. default port for chain
    uint16_t port{BaseParams().RPCPort()};
    SplitHostPort(gArgs.GetArg("-rpcconnect", DEFAULT_RPCCONNECT), port, host);
    port = static_cast<uint16_t>(gArgs.GetIntArg("-rpcport", port));
 
    // Obtain event base
    raii_event_base base = obtain_event_base();
 
    // Synchronously look up hostname
    raii_evhttp_connection evcon =
        obtain_evhttp_connection_base(base.get(), host, port);
 
    // Set connection timeout
    {
        const int timeout =
            gArgs.GetIntArg("-rpcclienttimeout", DEFAULT_HTTP_CLIENT_TIMEOUT);
        if (timeout > 0) {
            evhttp_connection_set_timeout(evcon.get(), timeout);
        } else {
            // Indefinite request timeouts are not possible in libevent-http,
            // so we set the timeout to a very long time period instead.
 
            // Average length of year in Gregorian calendar
            constexpr int YEAR_IN_SECONDS = 31556952;
            evhttp_connection_set_timeout(evcon.get(), 5 * YEAR_IN_SECONDS);
        }
    }
 
    HTTPReply response;
    raii_evhttp_request req =
        obtain_evhttp_request(http_request_done, (void *)&response);
    if (req == nullptr) {
        throw std::runtime_error("create http request failed");
    }
#if LIBEVENT_VERSION_NUMBER >= 0x02010300
    evhttp_request_set_error_cb(req.get(), http_error_cb);
#endif
 
    // Get credentials
    std::string strRPCUserColonPass;
    bool failedToGetAuthCookie = false;
    if (gArgs.GetArg("-rpcpassword", "") == "") {
        // Try fall back to cookie-based authentication if no password is
        // provided
        if (!GetAuthCookie(&strRPCUserColonPass)) {
            failedToGetAuthCookie = true;
        }
    } else {
        strRPCUserColonPass = gArgs.GetArg("-rpcuser", "") + ":" +
                              gArgs.GetArg("-rpcpassword", "");
    }
 
    struct evkeyvalq *output_headers =
        evhttp_request_get_output_headers(req.get());
    assert(output_headers);
    evhttp_add_header(output_headers, "Host", host.c_str());
    evhttp_add_header(output_headers, "Connection", "close");
    evhttp_add_header(output_headers, "Content-Type", "application/json");
    evhttp_add_header(
        output_headers, "Authorization",
        (std::string("Basic ") + EncodeBase64(strRPCUserColonPass)).c_str());
 
    // Attach request data
    std::string strRequest = rh->PrepareRequest(strMethod, args).write() + "\n";
    struct evbuffer *output_buffer =
        evhttp_request_get_output_buffer(req.get());
    assert(output_buffer);
    evbuffer_add(output_buffer, strRequest.data(), strRequest.size());
 
    // check if we should use a special wallet endpoint
    std::string endpoint = "/";
    if (rpcwallet) {
        char *encodedURI =
            evhttp_uriencode(rpcwallet->data(), rpcwallet->size(), false);
        if (encodedURI) {
            endpoint = "/wallet/" + std::string(encodedURI);
            free(encodedURI);
        } else {
            throw CConnectionFailed("uri-encode failed");
        }
    }
    int r = evhttp_make_request(evcon.get(), req.get(), EVHTTP_REQ_POST,
                                endpoint.c_str());
    // ownership moved to evcon in above call
    req.release();
    if (r != 0) {
        throw CConnectionFailed("send http request failed");
    }
 
    event_base_dispatch(base.get());
 
    if (response.status == 0) {
        std::string responseErrorMessage;
        if (response.error != -1) {
            responseErrorMessage =
                strprintf(" (error code %d - \"%s\")", response.error,
                          http_errorstring(response.error));
        }
        throw CConnectionFailed(
            strprintf("Could not connect to the server %s:%d%s\n\nMake sure "
                      "the bitcoind server is running and that you are "
                      "connecting to the correct RPC port.",
                      host, port, responseErrorMessage));
    } else if (response.status == HTTP_UNAUTHORIZED) {
        if (failedToGetAuthCookie) {
            throw std::runtime_error(strprintf(
                "Could not locate RPC credentials. No authentication cookie "
                "could be found, and RPC password is not set.  See "
                "-rpcpassword and -stdinrpcpass.  Configuration file: (%s)",
                fs::PathToString(gArgs.GetConfigFilePath())));
        } else {
            throw std::runtime_error(
                "Authorization failed: Incorrect rpcuser or rpcpassword");
        }
    } else if (response.status == HTTP_SERVICE_UNAVAILABLE) {
        throw std::runtime_error(
            strprintf("Server response: %s", response.body));
    } else if (response.status >= 400 && response.status != HTTP_BAD_REQUEST &&
               response.status != HTTP_NOT_FOUND &&
               response.status != HTTP_INTERNAL_SERVER_ERROR) {
        throw std::runtime_error(
            strprintf("server returned HTTP error %d", response.status));
    } else if (response.body.empty()) {
        throw std::runtime_error("no response from server");
    }
 
    // Parse reply
    UniValue valReply(UniValue::VSTR);
    if (!valReply.read(response.body)) {
        throw std::runtime_error("couldn't parse reply from server");
    }
    const UniValue reply = rh->ProcessReply(valReply);
    if (reply.empty()) {
        throw std::runtime_error(
            "expected reply to have result, error and id properties");
    }
 
    return reply;
}
 
static UniValue
ConnectAndCallRPC(BaseRequestHandler *rh, const std::string &strMethod,
                  const std::vector<std::string> &args,
                  const std::optional<std::string> &rpcwallet = {}) {
    UniValue response(UniValue::VOBJ);
    // Execute and handle connection failures with -rpcwait.
    const bool fWait = gArgs.GetBoolArg("-rpcwait", false);
    do {
        try {
            response = CallRPC(rh, strMethod, args, rpcwallet);
            if (fWait) {
                const UniValue &error = response.find_value("error");
                if (!error.isNull() &&
                    error["code"].getInt<int>() == RPC_IN_WARMUP) {
                    throw CConnectionFailed("server in warmup");
                }
            }
            break; // Connection succeeded, no need to retry.
        } catch (const CConnectionFailed &) {
            if (fWait) {
                UninterruptibleSleep(std::chrono::milliseconds{1000});
            } else {
                throw;
            }
        }
    } while (fWait);
    return response;
}
 
static void ParseResult(const UniValue &result, std::string &strPrint) {
    if (result.isNull()) {
        return;
    }
    strPrint = result.isStr() ? result.get_str() : result.write(2);
}
 
static void ParseError(const UniValue &error, std::string &strPrint,
                       int &nRet) {
    if (error.isObject()) {
        const UniValue &err_code = error.find_value("code");
        const UniValue &err_msg = error.find_value("message");
        if (!err_code.isNull()) {
            strPrint = "error code: " + err_code.getValStr() + "\n";
        }
        if (err_msg.isStr()) {
            strPrint += ("error message:\n" + err_msg.get_str());
        }
        if (err_code.isNum() &&
            err_code.getInt<int>() == RPC_WALLET_NOT_SPECIFIED) {
            strPrint += "\nTry adding \"-rpcwallet=<filename>\" option to "
                        "bitcoin-cli command line.";
        }
    } else {
        strPrint = "error: " + error.write();
    }
    nRet = abs(error["code"].getInt<int>());
}
 
static void GetWalletBalances(UniValue &result) {
    DefaultRequestHandler rh;
    const UniValue listwallets =
        ConnectAndCallRPC(&rh, "listwallets", /* args=*/{});
    if (!listwallets.find_value("error").isNull()) {
        return;
    }
    const UniValue &wallets = listwallets.find_value("result");
    if (wallets.size() <= 1) {
        return;
    }
 
    UniValue balances(UniValue::VOBJ);
    for (const UniValue &wallet : wallets.getValues()) {
        const std::string wallet_name = wallet.get_str();
        const UniValue getbalances =
            ConnectAndCallRPC(&rh, "getbalances", /* args=*/{}, wallet_name);
        const UniValue &balance =
            getbalances.find_value("result")["mine"]["trusted"];
        balances.pushKV(wallet_name, balance);
    }
    result.pushKV("balances", balances);
}
 
static UniValue GetNewAddress() {
    std::optional<std::string> wallet_name{};
    if (gArgs.IsArgSet("-rpcwallet")) {
        wallet_name = gArgs.GetArg("-rpcwallet", "");
    }
    DefaultRequestHandler rh;
    return ConnectAndCallRPC(&rh, "getnewaddress", /* args=*/{}, wallet_name);
}
 
static void SetGenerateToAddressArgs(const std::string &address,
                                     std::vector<std::string> &args) {
    if (args.size() > 2) {
        throw std::runtime_error(
            "too many arguments (maximum 2 for nblocks and maxtries)");
    }
    if (args.size() == 0) {
        args.emplace_back(DEFAULT_NBLOCKS);
    } else if (args.at(0) == "0") {
        throw std::runtime_error(
            "the first argument (number of blocks to generate, default: " +
            DEFAULT_NBLOCKS + ") must be an integer value greater than zero");
    }
    args.emplace(args.begin() + 1, address);
}
 
static int CommandLineRPC(int argc, char *argv[]) {
    std::string strPrint;
    int nRet = 0;
    try {
        // Skip switches
        while (argc > 1 && IsSwitchChar(argv[1][0])) {
            argc--;
            argv++;
        }
        std::string rpcPass;
        if (gArgs.GetBoolArg("-stdinrpcpass", false)) {
            NO_STDIN_ECHO();
            if (!StdinReady()) {
                fputs("RPC password> ", stderr);
                fflush(stderr);
            }
            if (!std::getline(std::cin, rpcPass)) {
                throw std::runtime_error("-stdinrpcpass specified but failed "
                                         "to read from standard input");
            }
            if (StdinTerminal()) {
                fputc('\n', stdout);
            }
            gArgs.ForceSetArg("-rpcpassword", rpcPass);
        }
        std::vector<std::string> args =
            std::vector<std::string>(&argv[1], &argv[argc]);
        if (gArgs.GetBoolArg("-stdinwalletpassphrase", false)) {
            NO_STDIN_ECHO();
            std::string walletPass;
            if (args.size() < 1 ||
                args[0].substr(0, 16) != "walletpassphrase") {
                throw std::runtime_error(
                    "-stdinwalletpassphrase is only applicable for "
                    "walletpassphrase(change)");
            }
            if (!StdinReady()) {
                fputs("Wallet passphrase> ", stderr);
                fflush(stderr);
            }
            if (!std::getline(std::cin, walletPass)) {
                throw std::runtime_error("-stdinwalletpassphrase specified but "
                                         "failed to read from standard input");
            }
            if (StdinTerminal()) {
                fputc('\n', stdout);
            }
            args.insert(args.begin() + 1, walletPass);
        }
        if (gArgs.GetBoolArg("-stdin", false)) {
            // Read one arg per line from stdin and append
            std::string line;
            while (std::getline(std::cin, line)) {
                args.push_back(line);
            }
            if (StdinTerminal()) {
                fputc('\n', stdout);
            }
        }
        std::unique_ptr<BaseRequestHandler> rh;
        std::string method;
        if (gArgs.IsArgSet("-getinfo")) {
            rh.reset(new GetinfoRequestHandler());
        } else if (gArgs.GetBoolArg("-generate", false)) {
            const UniValue getnewaddress{GetNewAddress()};
            const UniValue &error{getnewaddress.find_value("error")};
            if (error.isNull()) {
                SetGenerateToAddressArgs(
                    getnewaddress.find_value("result").get_str(), args);
                rh.reset(new GenerateToAddressRequestHandler());
            } else {
                ParseError(error, strPrint, nRet);
            }
        } else if (gArgs.GetBoolArg("-netinfo", false)) {
            rh.reset(new NetinfoRequestHandler());
        } else {
            rh.reset(new DefaultRequestHandler());
            if (args.size() < 1) {
                throw std::runtime_error(
                    "too few parameters (need at least command)");
            }
            method = args[0];
            // Remove trailing method name from arguments vector
            args.erase(args.begin());
        }
 
        if (nRet == 0) {
            // Perform RPC call
            std::optional<std::string> wallet_name{};
            if (gArgs.IsArgSet("-rpcwallet")) {
                wallet_name = gArgs.GetArg("-rpcwallet", "");
            }
            const UniValue reply =
                ConnectAndCallRPC(rh.get(), method, args, wallet_name);
 
            // Parse reply
            UniValue result = reply.find_value("result");
            const UniValue &error = reply.find_value("error");
            if (error.isNull()) {
                if (gArgs.IsArgSet("-getinfo") &&
                    !gArgs.IsArgSet("-rpcwallet")) {
                    // fetch multiwallet balances and append to result
                    GetWalletBalances(result);
                }
                ParseResult(result, strPrint);
            } else {
                ParseError(error, strPrint, nRet);
            }
        }
    } catch (const std::exception &e) {
        strPrint = std::string("error: ") + e.what();
        nRet = EXIT_FAILURE;
    } catch (...) {
        PrintExceptionContinue(nullptr, "CommandLineRPC()");
        throw;
    }
 
    if (strPrint != "") {
        tfm::format(nRet == 0 ? std::cout : std::cerr, "%s\n", strPrint);
    }
    return nRet;
}
 
#ifdef WIN32
// Export main() and ensure working ASLR on Windows.
// Exporting a symbol will prevent the linker from stripping
// the .reloc section from the binary, which is a requirement
// for ASLR. This is a temporary workaround until a fixed
// version of binutils is used for releases.
__declspec(dllexport) int main(int argc, char *argv[]) {
    common::WinCmdLineArgs winArgs;
    std::tie(argc, argv) = winArgs.get();
#else
int main(int argc, char *argv[]) {
#endif
    SetupEnvironment();
    if (!SetupNetworking()) {
        tfm::format(std::cerr, "Error: Initializing networking failed\n");
        return EXIT_FAILURE;
    }
    event_set_log_callback(&libevent_log_cb);
 
    try {
        int ret = AppInitRPC(argc, argv);
        if (ret != CONTINUE_EXECUTION) {
            return ret;
        }
    } catch (const std::exception &e) {
        PrintExceptionContinue(&e, "AppInitRPC()");
        return EXIT_FAILURE;
    } catch (...) {
        PrintExceptionContinue(nullptr, "AppInitRPC()");
        return EXIT_FAILURE;
    }
 
    int ret = EXIT_FAILURE;
    try {
        ret = CommandLineRPC(argc, argv);
    } catch (const std::exception &e) {
        PrintExceptionContinue(&e, "CommandLineRPC()");
    } catch (...) {
        PrintExceptionContinue(nullptr, "CommandLineRPC()");
    }
    return ret;
}