C++从零开始区块链：区块链业务模块之基于boost的json读写

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

std::string BlockChain::GetJsonFromBlock(Block &block)
{
    boost::property_tree::ptree item;

    boost::property_tree::ptree lstts;
    {
        std::list<Transactions>::iterator it;
        for (it = block.lst_ts.begin(); it != block.lst_ts.end(); ++it)
        {
            boost::property_tree::ptree ts;
            ts.put("sender", it->sender);
            ts.put("recipient", it->recipient);
            ts.put("amount", it->amount);
            lstts.push_back(make_pair("", ts));
        }
    }

    item.put("index", block.index);
    item.put("timestamp", block.timestamp);
    item.put_child("transactions", lstts);
    item.put("proof", block.proof);
    item.put("previous_hash", block.previous_hash);

    std::stringstream is;
    boost::property_tree::write_json(is, item);
    return is.str();
}

std::string BlockChain::GetJsonFromTransactions(Transactions &ts)
{
    boost::property_tree::ptree item;

    item.put("sender", ts.sender);
    item.put("recipient", ts.recipient);
    item.put("amount", ts.amount);

    std::stringstream is;
    boost::property_tree::write_json(is, item);
    return is.str();
}

Block BlockChain::GetBlockFromJson(const std::string &json)
{
    Block block;
    std::stringstream ss(json);
    boost::property_tree::ptree pt;
    boost::property_tree::ptree array;
    boost::property_tree::read_json(ss, pt);
    block.index = pt.get<int>("index");
    block.previous_hash = pt.get<std::string>("previous_hash");
    block.proof = pt.get<long int>("proof");
    block.timestamp = pt.get<time_t>("timestamp");
    array = pt.get_child("transactions");

    for (auto v : array)
    {
        Transactions ts;
        ts.sender = v.second.get<std::string>("sender");
        ts.recipient = v.second.get<std::string>("recipient");
        ts.amount = v.second.get<float>("amount");
        block.lst_ts.push_back(ts);
    }

    return block;
}

Transactions BlockChain::GetTransactionsFromJson(const std::string &json)
{
    Transactions ts;
    std::stringstream ss(json);
    boost::property_tree::ptree pt;
    boost::property_tree::read_json(ss, pt);

    ts.sender = pt.get<std::string>("sender");
    ts.recipient = pt.get<std::string>("recipient");
    ts.amount = pt.get<float>("amount");

    return ts;
}

std::string BlockChain::GetJsonFromBlockList()
{
    int i = 0;

    boost::property_tree::ptree item;

    boost::property_tree::ptree pblock;
    {
        std::list<Block>::iterator bit;

        pthread_mutex_lock(&m_mutexBlock);
        for (bit = m_lst_block.begin(); bit != m_lst_block.end(); ++bit)
        {
            boost::property_tree::ptree b;
            boost::property_tree::ptree pts;
            {
                std::list<Transactions>::iterator tit;
                for (tit = bit->lst_ts.begin(); tit != bit->lst_ts.end(); ++tit)
                {
                    boost::property_tree::ptree t;
                    t.put("sender", tit->sender);
                    t.put("recipient", tit->recipient);
                    t.put("amount", tit->amount);
                    pts.push_back(make_pair("", t));
                }
            }

            b.put("index", bit->index);
            b.put("timestamp", bit->timestamp);
            b.put_child("transactions", pts);
            b.put("proof", bit->proof);
            b.put("previous_hash", bit->previous_hash);
            pblock.push_back(make_pair("", b));

            ++i;
        }
        pthread_mutex_unlock(&m_mutexBlock);
    }

    item.put_child("chain", pblock);
    item.put("length", i);

    std::stringstream is;
    boost::property_tree::write_json(is, item);
    return is.str();
}

std::string BlockChain::GetJsonFromTransactionsList()
{
    int i = 0;

    boost::property_tree::ptree item;

    boost::property_tree::ptree pts;
    {
        std::list<Transactions>::iterator bit;

        pthread_mutex_lock(&m_mutexTs);
        for (bit = m_lst_ts.begin(); bit != m_lst_ts.end(); ++bit)
        {
            boost::property_tree::ptree b;

            b.put("sender", bit->sender);
            b.put("recipient", bit->recipient);
            b.put("amount", bit->amount);

            pts.push_back(make_pair("", b));

            ++i;
        }
        pthread_mutex_unlock(&m_mutexTs);
    }

    item.put_child("transactions", pts);
    item.put("length", i);

    std::stringstream is;
    boost::property_tree::write_json(is, item);
    return is.str();
}

std::list<Block> BlockChain::GetBlockListFromJson(const std::string &json)
{
    std::list<Block> lst_block;
    std::stringstream ss(json);
    boost::property_tree::ptree pt;
    boost::property_tree::ptree barray;
    boost::property_tree::read_json(ss, pt);
    barray = pt.get_child("chain");

    for (auto bv : barray)
    {
        Block block;
        boost::property_tree::ptree tarray;

        block.index = bv.second.get<int>("index");
        block.previous_hash = bv.second.get<std::string>("previous_hash");
        block.proof = bv.second.get<long int>("proof");
        block.timestamp = bv.second.get<time_t>("timestamp");
        tarray = bv.second.get_child("transactions");

        for (auto tv : tarray)
        {
            Transactions ts;
            ts.sender = tv.second.get<std::string>("sender");
            ts.recipient = tv.second.get<std::string>("recipient");
            ts.amount = tv.second.get<float>("amount");
            block.lst_ts.push_back(ts);
        }

        lst_block.push_back(block);
    }

    return lst_block;
}

void BlockChain::GetTransactionsListFromJson(const std::string &json)
{
    pthread_mutex_lock(&m_mutexTs);
    m_lst_ts.clear();
    pthread_mutex_unlock(&m_mutexTs);

    std::stringstream ss(json);
    boost::property_tree::ptree pt;
    boost::property_tree::ptree array;
    boost::property_tree::read_json(ss, pt);
    array = pt.get_child("transactions");

    for (auto v : array)
    {
        Transactions ts;
        ts.sender = v.second.get<std::string>("sender");
        ts.recipient = v.second.get<std::string>("recipient");
        ts.amount = v.second.get<float>("amount");

        pthread_mutex_lock(&m_mutexTs);
        m_lst_ts.push_back(ts);
        pthread_mutex_unlock(&m_mutexTs);
    }
}