...

1 files changed, 398 insertions, 249 deletions

diff --git a/src/hotstuff.cpp b/src/hotstuff.cpp
index 74d2f04..9582531 100644
--- a/src/hotstuff.cpp
+++ b/src/hotstuff.cpp
@@ -1,288 +1,437 @@
-#include <iostream>
-#include <cstring>
-#include <cassert>
-#include <algorithm>
-#include <random>
-#include <unistd.h>
-#include <signal.h>
-#include <event2/event.h>
-
-#include "salticidae/stream.h"
-#include "salticidae/util.h"
-#include "salticidae/network.h"
-#include "salticidae/msg.h"
-
-#include "hotstuff/promise.hpp"
-#include "hotstuff/type.h"
-#include "hotstuff/core.h"
-#include "hotstuff/entity.h"
-#include "hotstuff/util.h"
-#include "hotstuff/client.h"
-
-using promise::promise_t;
-using salticidae::NetAddr;
-using salticidae::MsgNetwork;
-using salticidae::ClientNetwork;
-using salticidae::Event;
-using salticidae::ElapsedTime;
-using salticidae::Config;
-using salticidae::_1;
-using salticidae::_2;
+#include "hotstuff/hotstuff.h"
+
 using salticidae::static_pointer_cast;
-using salticidae::get_hash;
-using salticidae::trim_all;
-using salticidae::split;
-
-using hotstuff::HotStuffError;
-using hotstuff::CommandDummy;
-using hotstuff::Finality;
-using hotstuff::command_t;
-using hotstuff::uint256_t;
-using hotstuff::bytearray_t;
-using hotstuff::DataStream;
-using hotstuff::ReplicaID;
-using hotstuff::MsgClient;
-
-using HotStuff = hotstuff::HotStuffSecp256k1;
 
 #define LOG_INFO HOTSTUFF_LOG_INFO
 #define LOG_DEBUG HOTSTUFF_LOG_DEBUG
 #define LOG_WARN HOTSTUFF_LOG_WARN
-#define LOG_ERROR HOTSTUFF_LOG_ERROR
-
-class HotStuffApp;
-
-class HotStuffApp: public HotStuff {
-    double stat_period;
-    /** libevent handle */
-    EventContext eb;
-    /** network messaging between a replica and its client */
-    ClientNetwork<MsgClient> cn;
-    /** timer object to schedule a periodic printing of system statistics */
-    Event ev_stat_timer;
-    /** the binding address for client RPC */
-    NetAddr clisten_addr;
-
-    using conn_client_t = MsgNetwork<MsgClient>::conn_t;
-
-    /** Client  */
-    /** submits a new command */
-    inline void client_request_cmd_handler(const MsgClient &, conn_client_t);
-    /** checks if a cmd is decided */
-    inline void client_check_cmd_handler(const MsgClient &, conn_client_t);
-
-    /** The callback function to print stat */
-    inline void print_stat_cb(evutil_socket_t, short);
-
-    command_t parse_cmd(DataStream &s) override {
-        auto cmd = new CommandDummy();
-        s >> *cmd;
-        return cmd;
-    }
 
-    public:
-    HotStuffApp(uint32_t blk_size,
-                int32_t parent_limit,
-                double stat_period,
-                ReplicaID idx,
-                const bytearray_t &raw_privkey,
-                NetAddr plisten_addr,
-                NetAddr clisten_addr,
-                const EventContext &eb);
-
-    void start();
-};
-
-
-std::pair<std::string, std::string> split_ip_port_cport(const std::string &s) {
-    auto ret = trim_all(split(s, ";"));
-    if (ret.size() != 2)
-        throw std::invalid_argument("invalid cport format");
-    return std::make_pair(ret[0], ret[1]);
+namespace hotstuff {
+
+void MsgHotStuff::gen_propose(const Proposal &proposal) {
+    DataStream s;
+    set_opcode(PROPOSE);
+    s << proposal;
+    set_payload(std::move(s));
 }
 
-void signal_handler(int) {
-    throw HotStuffError("got terminal signal");
+void MsgHotStuff::parse_propose(Proposal &proposal) const {
+    DataStream(get_payload()) >> proposal;
 }
 
-BoxObj<HotStuffApp> papp = nullptr;
-
-int main(int argc, char **argv) {
-    Config config("hotstuff.conf");
-
-    ElapsedTime elapsed;
-    elapsed.start();
-
-    signal(SIGTERM, signal_handler);
-    signal(SIGINT, signal_handler);
-
-    auto opt_blk_size = Config::OptValInt::create(1);
-    auto opt_parent_limit = Config::OptValInt::create(-1);
-    auto opt_stat_period = Config::OptValDouble::create(10);
-    auto opt_replicas = Config::OptValStrVec::create();
-    auto opt_idx = Config::OptValInt::create(0);
-    auto opt_client_port = Config::OptValInt::create(-1);
-    auto opt_privkey = Config::OptValStr::create();
-    auto opt_help = Config::OptValFlag::create(false);
-
-    config.add_opt("block-size", opt_blk_size, Config::SET_VAL);
-    config.add_opt("parent-limit", opt_parent_limit, Config::SET_VAL);
-    config.add_opt("stat-period", opt_stat_period, Config::SET_VAL);
-    config.add_opt("replica", opt_replicas, Config::APPEND);
-    config.add_opt("idx", opt_idx, Config::SET_VAL);
-    config.add_opt("cport", opt_client_port, Config::SET_VAL);
-    config.add_opt("privkey", opt_privkey, Config::SET_VAL);
-    config.add_opt("help", opt_help, Config::SWITCH_ON, 'h', "show this help info");
-
-    EventContext eb;
-#ifndef HOTSTUFF_ENABLE_LOG_DEBUG
-    try {
-#endif
-        config.parse(argc, argv);
-        if (opt_help->get())
-        {
-            config.print_help();
-            exit(0);
-        }
-        auto idx = opt_idx->get();
-        auto client_port = opt_client_port->get();
-        std::vector<std::pair<std::string, std::string>> replicas;
-        for (const auto &s: opt_replicas->get())
+void MsgHotStuff::gen_vote(const Vote &vote) {
+    DataStream s;
+    set_opcode(VOTE);
+    s << vote;
+    set_payload(std::move(s));
+}
+
+void MsgHotStuff::parse_vote(Vote &vote) const {
+    DataStream(get_payload()) >> vote;
+}
+
+void MsgHotStuff::gen_qfetchblk(const std::vector<uint256_t> &blk_hashes) {
+    DataStream s;
+    set_opcode(QUERY_FETCH_BLK);
+    gen_hash_list(s, blk_hashes);
+    set_payload(std::move(s));
+}
+
+void MsgHotStuff::parse_qfetchblk(std::vector<uint256_t> &blk_hashes) const {
+    DataStream s(get_payload());
+    parse_hash_list(s, blk_hashes);
+}
+
+void MsgHotStuff::gen_rfetchblk(const std::vector<block_t> &blks) {
+    DataStream s;
+    set_opcode(RESP_FETCH_BLK);
+    s << htole((uint32_t)blks.size());
+    for (auto blk: blks) s << *blk;
+    set_payload(std::move(s));
+}
+
+void MsgHotStuff::parse_rfetchblk(std::vector<block_t> &blks, HotStuffCore *hsc) const {
+    DataStream s;
+    uint32_t size;
+    s >> size;
+    size = letoh(size);
+    blks.resize(size);
+    for (auto &blk: blks)
+    {
+        Block _blk;
+        _blk.unserialize(s, hsc);
+        if (!_blk.verify(hsc->get_config()))
+            blk = hsc->storage->add_blk(std::move(_blk));
+        else
         {
-            auto res = trim_all(split(s, ","));
-            if (res.size() != 2)
-                throw HotStuffError("invalid replica info");
-            replicas.push_back(std::make_pair(res[0], res[1]));
+            blk = nullptr;
+            LOG_WARN("block is invalid");
         }
+    }
+}
 
-        if (!(0 <= idx && (size_t)idx < replicas.size()))
-            throw HotStuffError("replica idx out of range");
-        std::string binding_addr = replicas[idx].first;
-        if (client_port == -1)
+void HotStuffBase::add_replica(ReplicaID idx, const NetAddr &addr,
+                                pubkey_bt &&pub_key) {
+    HotStuffCore::add_replica(idx, addr, std::move(pub_key));
+    if (addr != listen_addr)
+        pn.add_peer(addr);
+}
+
+void HotStuffBase::on_fetch_blk(const block_t &blk) {
+#ifdef HOTSTUFF_ENABLE_TX_PROFILE
+    blk_profiler.get_tx(blk->get_hash());
+#endif
+    LOG_DEBUG("fetched %.10s", get_hex(blk->get_hash()).c_str());
+    part_fetched++;
+    fetched++;
+    for (auto cmd: blk->get_cmds()) on_fetch_cmd(cmd);
+    const uint256_t &blk_hash = blk->get_hash();
+    auto it = blk_fetch_waiting.find(blk_hash);
+    if (it != blk_fetch_waiting.end())
+    {
+        it->second.resolve(blk);
+        blk_fetch_waiting.erase(it);
+    }
+}
+
+void HotStuffBase::on_fetch_cmd(const command_t &cmd) {
+    const uint256_t &cmd_hash = cmd->get_hash();
+    auto it = cmd_fetch_waiting.find(cmd_hash);
+    if (it != cmd_fetch_waiting.end())
+    {
+        it->second.resolve(cmd);
+        cmd_fetch_waiting.erase(it);
+    }
+}
+
+void HotStuffBase::on_deliver_blk(const block_t &blk) {
+    const uint256_t &blk_hash = blk->get_hash();
+    bool valid;
+    /* sanity check: all parents must be delivered */
+    for (const auto &p: blk->get_parent_hashes())
+        assert(storage->is_blk_delivered(p));
+    if ((valid = HotStuffCore::on_deliver_blk(blk)))
+    {
+        LOG_DEBUG("block %.10s delivered",
+                get_hex(blk_hash).c_str());
+        part_parent_size += blk->get_parent_hashes().size();
+        part_delivered++;
+        delivered++;
+    }
+    else
+    {
+        LOG_WARN("dropping invalid block");
+    }
+
+    auto it = blk_delivery_waiting.find(blk_hash);
+    if (it != blk_delivery_waiting.end())
+    {
+        auto &pm = it->second;
+        if (valid)
         {
-            auto p = split_ip_port_cport(binding_addr);
-            size_t idx;
-            try {
-                client_port = stoi(p.second, &idx);
-            } catch (std::invalid_argument &) {
-                throw HotStuffError("client port not specified");
-            }
-        }
+            pm.elapsed.stop(false);
+            auto sec = pm.elapsed.elapsed_sec;
+            part_delivery_time += sec;
+            part_delivery_time_min = std::min(part_delivery_time_min, sec);
+            part_delivery_time_max = std::max(part_delivery_time_max, sec);
 
-        NetAddr plisten_addr{split_ip_port_cport(binding_addr).first};
-
-        papp = new HotStuffApp(opt_blk_size->get(),
-                            opt_parent_limit->get(),
-                            opt_stat_period->get(),
-                            idx,
-                            hotstuff::from_hex(opt_privkey->get()),
-                            plisten_addr,
-                            NetAddr("0.0.0.0", client_port),
-                            eb);
-        for (size_t i = 0; i < replicas.size(); i++)
+            pm.resolve(blk);
+        }
+        else
         {
-            auto p = split_ip_port_cport(replicas[i].first);
-            papp->add_replica(i, NetAddr(p.first),
-                                hotstuff::from_hex(replicas[i].second));
+            pm.reject(blk);
+            // TODO: do we need to also free it from storage?
         }
-        papp->start();
-#ifndef HOTSTUFF_ENABLE_LOG_DEBUG
-    } catch (std::exception &e) {
-        HOTSTUFF_LOG_INFO("exception: %s", e.what());
-        elapsed.stop(true);
+        blk_delivery_waiting.erase(it);
     }
+}
+
+promise_t HotStuffBase::async_fetch_blk(const uint256_t &blk_hash,
+                                        const NetAddr *replica_id,
+                                        bool fetch_now) {
+    if (storage->is_blk_fetched(blk_hash))
+        return promise_t([this, &blk_hash](promise_t pm){
+            pm.resolve(storage->find_blk(blk_hash));
+        });
+    auto it = blk_fetch_waiting.find(blk_hash);
+    if (it == blk_fetch_waiting.end())
+    {
+#ifdef HOTSTUFF_ENABLE_TX_PROFILE
+        blk_profiler.rec_tx(blk_hash, false);
 #endif
-    return 0;
+        it = blk_fetch_waiting.insert(
+            std::make_pair(
+                blk_hash,
+                BlockFetchContext(blk_hash, this))).first;
+    }
+    if (replica_id != nullptr)
+        it->second.add_replica(*replica_id, fetch_now);
+    return static_cast<promise_t &>(it->second);
 }
 
-HotStuffApp::HotStuffApp(uint32_t blk_size,
-                        int32_t parent_limit,
-                        double stat_period,
-                        ReplicaID idx,
-                        const bytearray_t &raw_privkey,
-                        NetAddr plisten_addr,
-                        NetAddr clisten_addr,
-                        const EventContext &eb):
-    HotStuff(blk_size, parent_limit, idx, raw_privkey,
-            plisten_addr, eb),
-    stat_period(stat_period),
-    eb(eb),
-    cn(eb),
-    clisten_addr(clisten_addr) {
-    /* register the handlers for msg from clients */
-    cn.reg_handler(hotstuff::REQ_CMD, std::bind(&HotStuffApp::client_request_cmd_handler, this, _1, _2));
-    cn.reg_handler(hotstuff::CHK_CMD, std::bind(&HotStuffApp::client_check_cmd_handler, this, _1, _2));
-    cn.init(clisten_addr);
+promise_t HotStuffBase::async_fetch_cmd(const uint256_t &cmd_hash,
+                                    const NetAddr *replica_id,
+                                    bool fetch_now) {
+    if (storage->is_cmd_fetched(cmd_hash))
+        return promise_t([this, &cmd_hash](promise_t pm){
+            pm.resolve(storage->find_cmd(cmd_hash));
+        });
+    auto it = cmd_fetch_waiting.find(cmd_hash);
+    if (it == cmd_fetch_waiting.end())
+    {
+        it = cmd_fetch_waiting.insert(
+            std::make_pair(cmd_hash, CmdFetchContext(cmd_hash, this))).first;
+    }
+    if (replica_id != nullptr)
+        it->second.add_replica(*replica_id, fetch_now);
+    return static_cast<promise_t &>(it->second);
 }
 
-void HotStuffApp::client_request_cmd_handler(const MsgClient &msg, conn_client_t conn_) {
-    auto conn = static_pointer_cast<ClientNetwork<MsgClient>::Conn>(conn_);
-    const NetAddr addr = conn->get_addr();
-    command_t cmd = new CommandDummy();
+promise_t HotStuffBase::async_deliver_blk(const uint256_t &blk_hash,
+                                        const NetAddr &replica_id) {
+    if (storage->is_blk_delivered(blk_hash))
+        return promise_t([this, &blk_hash](promise_t pm) {
+            pm.resolve(storage->find_blk(blk_hash));
+        });
+    auto it = blk_delivery_waiting.find(blk_hash);
+    if (it != blk_delivery_waiting.end())
+        return static_cast<promise_t &>(it->second);
+    BlockDeliveryContext pm{[](promise_t){}};
+    it = blk_delivery_waiting.insert(std::make_pair(blk_hash, pm)).first;
+    /* otherwise the on_deliver_batch will resolve */
+    async_fetch_blk(blk_hash, &replica_id).then([this, replica_id](block_t blk) {
+        /* qc_ref should be fetched */
+        std::vector<promise_t> pms;
+        const auto &qc = blk->get_qc();
+        if (qc)
+            pms.push_back(async_fetch_blk(qc->get_blk_hash(), &replica_id));
+        /* the parents should be delivered */
+        for (const auto &phash: blk->get_parent_hashes())
+            pms.push_back(async_deliver_blk(phash, replica_id));
+        promise::all(pms).then([this, blk]() {
+            on_deliver_blk(blk);
+        });
+    });
+    return static_cast<promise_t &>(pm);
+}
+
+void HotStuffBase::propose_handler(const MsgHotStuff &msg, conn_t conn_) {
+    auto conn = static_pointer_cast<PeerNetwork<MsgHotStuff>::Conn>(conn_);
+    const NetAddr &peer = conn->get_peer();
+    Proposal prop(this);
+    msg.parse_propose(prop);
+    block_t blk = prop.blk;
+    promise::all(std::vector<promise_t>{
+        async_deliver_blk(prop.bqc_hash, peer),
+        async_deliver_blk(blk->get_hash(), peer),
+    }).then([this, prop = std::move(prop)]() {
+        on_receive_proposal(prop);
+    });
+}
+
+void HotStuffBase::vote_handler(const MsgHotStuff &msg, conn_t conn_) {
+    auto conn = static_pointer_cast<PeerNetwork<MsgHotStuff>::Conn>(conn_);
+    const NetAddr &peer = conn->get_peer();
+    Vote vote(this);
+    msg.parse_vote(vote);
+    promise::all(std::vector<promise_t>{
+        async_deliver_blk(vote.bqc_hash, peer),
+        async_deliver_blk(vote.blk_hash, peer)
+    }).then([this, vote = std::move(vote)]() {
+        on_receive_vote(vote);
+    });
+}
+
+void HotStuffBase::query_fetch_blk_handler(const MsgHotStuff &msg, conn_t conn_) {
+    auto conn = static_pointer_cast<PeerNetwork<MsgHotStuff>::Conn>(conn_);
+    const NetAddr replica = conn->get_peer();
+    std::vector<uint256_t> blk_hashes;
+    msg.parse_qfetchblk(blk_hashes);
+
     std::vector<promise_t> pms;
-    msg.parse_reqcmd(static_cast<CommandDummy &>(*cmd));
+    for (const auto &h: blk_hashes)
+        pms.push_back(async_fetch_blk(h, nullptr));
+    promise::all(pms).then([replica, this](const promise::values_t values) {
+        MsgHotStuff resp;
+        std::vector<block_t> blks;
+        for (auto &v: values)
+        {
+            auto blk = promise::any_cast<block_t>(v);
+            blks.push_back(blk);
+        }
+        resp.gen_rfetchblk(blks);
+        pn.send_msg(resp, replica);
+    });
+}
 
-    bool flag = true;
-#ifndef HOTSTUFF_DISABLE_TX_VERIFY
-    flag &= cmd->verify();
-#endif
-    if (!flag)
+void HotStuffBase::resp_fetch_blk_handler(const MsgHotStuff &msg, conn_t) {
+    std::vector<block_t> blks;
+    msg.parse_rfetchblk(blks, this);
+    for (const auto &blk: blks)
+        if (blk) on_fetch_blk(blk);
+}
+
+void HotStuffBase::print_stat() const {
+    LOG_INFO("===== begin stats =====");
+    LOG_INFO("-------- queues -------");
+    LOG_INFO("blk_fetch_waiting: %lu", blk_fetch_waiting.size());
+    LOG_INFO("blk_delivery_waiting: %lu", blk_delivery_waiting.size());
+    LOG_INFO("cmd_fetch_waiting: %lu", cmd_fetch_waiting.size());
+    LOG_INFO("decision_waiting: %lu", decision_waiting.size());
+    LOG_INFO("-------- misc ---------");
+    LOG_INFO("fetched: %lu", fetched);
+    LOG_INFO("delivered: %lu", delivered);
+    LOG_INFO("cmd_cache: %lu", storage->get_cmd_cache_size());
+    LOG_INFO("blk_cache: %lu", storage->get_blk_cache_size());
+    LOG_INFO("------ misc (10s) -----");
+    LOG_INFO("fetched: %lu", part_fetched);
+    LOG_INFO("delivered: %lu", part_delivered);
+    LOG_INFO("decided: %lu", part_decided);
+    LOG_INFO("gened: %lu", part_gened);
+    LOG_INFO("avg. parent_size: %.3f",
+            part_delivered ? part_parent_size / double(part_delivered) : 0);
+    LOG_INFO("delivery time: %.3f avg, %.3f min, %.3f max",
+            part_delivered ? part_delivery_time / double(part_delivered) : 0,
+            part_delivery_time_min == double_inf ? 0 : part_delivery_time_min,
+            part_delivery_time_max);
+
+    part_parent_size = 0;
+    part_fetched = 0;
+    part_delivered = 0;
+    part_decided = 0;
+    part_gened = 0;
+    part_delivery_time = 0;
+    part_delivery_time_min = double_inf;
+    part_delivery_time_max = 0;
+    LOG_INFO("-- sent opcode (10s) --");
+    auto &sent_op = pn.get_sent_by_opcode();
+    for (auto &op: sent_op)
     {
-        LOG_WARN("invalid client cmd");
-        MsgClient resp;
-        resp.gen_respcmd(cmd->get_hash(), Finality(-1, uint256_t()));
-        cn.send_msg(resp, addr);
+        auto &val = op.second;
+        LOG_INFO("%02x: %lu, %.2fBpm", op.first,
+                val.first, val.first ? val.second / double(val.first) : 0);
+        val.first = val.second = 0;
     }
-    else
+    LOG_INFO("-- recv opcode (10s) --");
+    auto &recv_op = pn.get_recv_by_opcode();
+    for (auto &op: recv_op)
     {
-        const uint256_t cmd_hash = cmd->get_hash();
-        add_command(cmd);
-        /** wait for the decision of tx */
-        LOG_DEBUG("processing client cmd %.10s", get_hex(cmd_hash).c_str());
-        async_decide(cmd_hash).then([this, addr](command_t cmd) {
-            MsgClient resp;
-            resp.gen_respcmd(cmd->get_hash(), cmd->get_finality());
-            cn.send_msg(resp, addr);
+        auto &val = op.second;
+        LOG_INFO("%02x: %lu, %.2fBpm", op.first,
+                val.first, val.first ? val.second / double(val.first) : 0);
+        val.first = val.second = 0;
+    }
+    LOG_INFO("--- replica msg. (10s) ---");
+    size_t _nsent = 0;
+    size_t _nrecv = 0;
+    for (const auto &replica: pn.all_peers())
+    {
+        auto conn = pn.get_peer_conn(replica);
+        size_t ns = conn->get_nsent();
+        size_t nr = conn->get_nrecv();
+        conn->clear_nsent();
+        conn->clear_nrecv();
+        LOG_INFO("%s: %u, %u, %u",
+            std::string(replica).c_str(), ns, nr, part_fetched_replica[replica]);
+        _nsent += ns;
+        _nrecv += nr;
+        part_fetched_replica[replica] = 0;
+    }
+    nsent += _nsent;
+    nrecv += _nrecv;
+    LOG_INFO("sent: %lu", _nsent);
+    LOG_INFO("recv: %lu", _nrecv);
+    LOG_INFO("--- replica msg. total ---");
+    LOG_INFO("sent: %lu", nsent);
+    LOG_INFO("recv: %lu", nrecv);
+    LOG_INFO("====== end stats ======");
+}
+
+promise_t HotStuffBase::async_decide(const uint256_t &cmd_hash) {
+    if (get_cmd_decision(cmd_hash))
+        return promise_t([this, cmd_hash](promise_t pm){
+            pm.resolve(storage->find_cmd(cmd_hash));
         });
+    /* otherwise the do_decide will resolve the promise */
+    auto it = decision_waiting.find(cmd_hash);
+    if (it == decision_waiting.end())
+    {
+        promise_t pm{[](promise_t){}};
+        it = decision_waiting.insert(std::make_pair(cmd_hash, pm)).first;
     }
+    return it->second;
 }
 
-void HotStuffApp::client_check_cmd_handler(const MsgClient &msg, conn_client_t conn_) {
-    auto conn = static_pointer_cast<ClientNetwork<MsgClient>::Conn>(conn_);
-    const NetAddr addr = conn->get_addr();
-    uint256_t cmd_hash;
-    msg.parse_chkcmd(cmd_hash);
-    MsgClient resp;
-    command_t cmd = storage->find_cmd(cmd_hash);
-    Finality fin;
-    if (cmd) fin = cmd->get_finality();
-    resp.gen_respcmd(cmd_hash, fin);
-    cn.send_msg(resp, addr);
+HotStuffBase::HotStuffBase(uint32_t blk_size,
+                    int32_t parent_limit,
+                    ReplicaID rid,
+                    privkey_bt &&priv_key,
+                    NetAddr listen_addr,
+                    EventContext eb,
+                    pacemaker_bt pmaker):
+        HotStuffCore(rid, std::move(priv_key), parent_limit),
+        listen_addr(listen_addr),
+        blk_size(blk_size),
+        eb(eb),
+        pmaker(std::move(pmaker)),
+        pn(eb),
+
+        fetched(0), delivered(0),
+        nsent(0), nrecv(0),
+        part_parent_size(0),
+        part_fetched(0),
+        part_delivered(0),
+        part_decided(0),
+        part_gened(0),
+        part_delivery_time(0),
+        part_delivery_time_min(double_inf),
+        part_delivery_time_max(0)
+{
+    if (pmaker == nullptr)
+        this->pmaker = new PaceMakerDummy(this);
+    /* register the handlers for msg from replicas */
+    pn.reg_handler(PROPOSE, std::bind(&HotStuffBase::propose_handler, this, _1, _2));
+    pn.reg_handler(VOTE, std::bind(&HotStuffBase::vote_handler, this, _1, _2));
+    pn.reg_handler(QUERY_FETCH_BLK, std::bind(&HotStuffBase::query_fetch_blk_handler, this, _1, _2));
+    pn.reg_handler(RESP_FETCH_BLK, std::bind(&HotStuffBase::resp_fetch_blk_handler, this, _1, _2));
+    pn.init(listen_addr);
 }
 
+void HotStuffBase::do_broadcast_proposal(const Proposal &prop) {
+    MsgHotStuff prop_msg;
+    prop_msg.gen_propose(prop);
+    for (const auto &replica: pn.all_peers())
+        pn.send_msg(prop_msg, replica);
+}
 
-void HotStuffApp::start() {
-    ev_stat_timer = Event(eb, -1, 0,
-            std::bind(&HotStuffApp::print_stat_cb, this, _1, _2));
-    ev_stat_timer.add_with_timeout(stat_period);
-    LOG_INFO("** starting the system with parameters **");
-    LOG_INFO("blk_size = %lu", blk_size);
-    LOG_INFO("parent_limit = %d", parent_limit);
-    LOG_INFO("conns = %lu", HotStuff::size());
-    LOG_INFO("** starting the event loop...");
-#ifdef HOTSTUFF_DISABLE_TX_VERIFY
-    LOG_INFO("!! verification disabled !!");
-#else
-    LOG_INFO("** verification enabled **");
-#endif
-    HotStuff::start();
-    /* enter the event main loop */
-    eb.dispatch();
+void HotStuffBase::do_vote(ReplicaID last_proposer, const Vote &vote) {
+    MsgHotStuff vote_msg;
+    vote_msg.gen_vote(vote);
+    pmaker->next_proposer(last_proposer)
+            .then([this, vote_msg](ReplicaID proposer) {
+        pn.send_msg(vote_msg, get_config().get_addr(proposer));
+    });
 }
 
+void HotStuffBase::do_decide(const command_t &cmd) {
+    auto it = decision_waiting.find(cmd->get_hash());
+    if (it != decision_waiting.end())
+    {
+        it->second.resolve(cmd);
+        decision_waiting.erase(it);
+    }
+}
+
+HotStuffBase::~HotStuffBase() {}
+
+void HotStuffBase::start(bool eb_loop) {
+    /* ((n - 1) + 1 - 1) / 3 */
+    uint32_t nfaulty = pn.all_peers().size() / 3;
+    if (nfaulty == 0)
+        LOG_WARN("too few replicas in the system to tolerate any failure");
+    on_init(nfaulty);
+    if (eb_loop)
+        eb.dispatch();
+}
 
-void HotStuffApp::print_stat_cb(evutil_socket_t, short) {
-    HotStuff::print_stat();
-    HotStuffCore::prune(100);
-    ev_stat_timer.add_with_timeout(stat_period);
 }