path: root/include/hotstuff/entity.h

/**
 * Copyright 2018 VMware
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _HOTSTUFF_ENT_H
#define _HOTSTUFF_ENT_H

#include <vector>
#include <unordered_map>
#include <unordered_set>
#include <string>
#include <cstddef>
#include <ios>

#include "salticidae/netaddr.h"
#include "salticidae/ref.h"
#include "hotstuff/type.h"
#include "hotstuff/util.h"
#include "hotstuff/crypto.h"

namespace hotstuff {

enum EntityType {
    ENT_TYPE_CMD = 0x0,
    ENT_TYPE_BLK = 0x1
};

struct ReplicaInfo {
    ReplicaID id;
    salticidae::NetAddr addr;
    pubkey_bt pubkey;

    ReplicaInfo(ReplicaID id,
                const salticidae::NetAddr &addr,
                pubkey_bt &&pubkey):
        id(id), addr(addr), pubkey(std::move(pubkey)) {}

    ReplicaInfo(const ReplicaInfo &other):
        id(other.id), addr(other.addr),
        pubkey(other.pubkey->clone()) {}

    ReplicaInfo(ReplicaInfo &&other):
        id(other.id), addr(other.addr),
        pubkey(std::move(other.pubkey)) {}
};

class ReplicaConfig {
    std::unordered_map<ReplicaID, ReplicaInfo> replica_map;

    public:
    size_t nreplicas;
    size_t nmajority;

    ReplicaConfig(): nreplicas(0), nmajority(0) {}

    void add_replica(ReplicaID rid, const ReplicaInfo &info) {
        replica_map.insert(std::make_pair(rid, info));
        nreplicas++;
    }

    const ReplicaInfo &get_info(ReplicaID rid) const {
        auto it = replica_map.find(rid);
        if (it == replica_map.end())
            throw HotStuffError("rid %s not found",
                    get_hex(rid).c_str());
        return it->second;
    }

    const PubKey &get_pubkey(ReplicaID rid) const {
        return *(get_info(rid).pubkey);
    }

    const salticidae::NetAddr &get_addr(ReplicaID rid) const {
        return get_info(rid).addr;
    }
};

class Block;
class HotStuffCore;

using block_t = salticidae::ArcObj<Block>;

class Command: public Serializable {
    friend HotStuffCore;
    public:
    virtual ~Command() = default;
    virtual const uint256_t &get_hash() const = 0;
    virtual bool verify() const = 0;
    virtual operator std::string () const {
        DataStream s;
        s << "<cmd id=" << get_hex10(get_hash()) << ">";
        return std::move(s);
    }
};

using command_t = ArcObj<Command>;

template<typename Hashable>
inline static std::vector<uint256_t>
get_hashes(const std::vector<Hashable> &plist) {
    std::vector<uint256_t> hashes;
    for (const auto &p: plist)
        hashes.push_back(p->get_hash());
    return std::move(hashes);
}

class Block {
    friend HotStuffCore;
    std::vector<uint256_t> parent_hashes;
    std::vector<uint256_t> cmds;
    quorum_cert_bt qc;
    bytearray_t extra;

    /* the following fields can be derived from above */
    uint256_t hash;
    std::vector<block_t> parents;
    block_t qc_ref;
    quorum_cert_bt self_qc;
    uint32_t height;
    bool delivered;
    int8_t decision;

    std::unordered_set<ReplicaID> voted;

    public:
    Block():
        qc(nullptr),
        qc_ref(nullptr),
        self_qc(nullptr), height(0),
        delivered(false), decision(0) {}

    Block(bool delivered, int8_t decision):
        qc(nullptr),
        hash(salticidae::get_hash(*this)),
        qc_ref(nullptr),
        self_qc(nullptr), height(0),
        delivered(delivered), decision(decision) {}

    Block(const std::vector<block_t> &parents,
        const std::vector<uint256_t> &cmds