zmqpublishnotifier.cpp

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// Copyright (c) 2015 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "zmqpublishnotifier.h"
 
#include "chainparams.h"
#include "util/system.h"
#include "crypto/common.h"
#include "validation.h"     // cs_main
 
static std::multimap<std::string, CZMQAbstractPublishNotifier*> mapPublishNotifiers;
 
static const char *MSG_HASHBLOCK  = "hashblock";
static const char *MSG_HASHTX     = "hashtx";
static const char *MSG_RAWBLOCK   = "rawblock";
static const char *MSG_RAWTX      = "rawtx";
 
// Internal function to send multipart message
static int zmq_send_multipart(void *sock, const void* data, size_t size, ...)
{
    va_list args;
    va_start(args, size);
 
    while (1)
    {
        zmq_msg_t msg;
 
        int rc = zmq_msg_init_size(&msg, size);
        if (rc != 0)
        {
            zmqError("Unable to initialize ZMQ msg");
            va_end(args);
            return -1;
        }
 
        void *buf = zmq_msg_data(&msg);
        memcpy(buf, data, size);
 
        data = va_arg(args, const void*);
 
        rc = zmq_msg_send(&msg, sock, data ? ZMQ_SNDMORE : 0);
        if (rc == -1)
        {
            zmqError("Unable to send ZMQ msg");
            zmq_msg_close(&msg);
            va_end(args);
            return -1;
        }
 
        zmq_msg_close(&msg);
 
        if (!data)
            break;
 
        size = va_arg(args, size_t);
    }
    va_end(args);
    return 0;
}
 
bool CZMQAbstractPublishNotifier::Initialize(void *pcontext)
{
    assert(!psocket);
 
    // check if address is being used by other publish notifier
    std::multimap<std::string, CZMQAbstractPublishNotifier*>::iterator i = mapPublishNotifiers.find(address);
 
    if (i==mapPublishNotifiers.end())
    {
        psocket = zmq_socket(pcontext, ZMQ_PUB);
        if (!psocket)
        {
            zmqError("Failed to create socket");
            return false;
        }
 
        int rc = zmq_bind(psocket, address.c_str());
        if (rc!=0)
        {
            zmqError("Failed to bind address");
            zmq_close(psocket);
            return false;
        }
 
        // register this notifier for the address, so it can be reused for other publish notifier
        mapPublishNotifiers.emplace(address, this);
        return true;
    }
    else
    {
        LogPrint(BCLog::ZMQ, "Reusing socket for address %s\n", address);
 
        psocket = i->second->psocket;
        mapPublishNotifiers.emplace(address, this);
 
        return true;
    }
}
 
void CZMQAbstractPublishNotifier::Shutdown()
{
    assert(psocket);
 
    int count = mapPublishNotifiers.count(address);
 
    // remove this notifier from the list of publishers using this address
    typedef std::multimap<std::string, CZMQAbstractPublishNotifier*>::iterator iterator;
    std::pair<iterator, iterator> iterpair = mapPublishNotifiers.equal_range(address);
 
    for (iterator it = iterpair.first; it != iterpair.second; ++it)
    {
        if (it->second==this)
        {
            mapPublishNotifiers.erase(it);
            break;
        }
    }
 
    if (count == 1)
    {
        LogPrint(BCLog::ZMQ, "Close socket at address %s\n", address);
        int linger = 0;
        zmq_setsockopt(psocket, ZMQ_LINGER, &linger, sizeof(linger));
        zmq_close(psocket);
    }
 
    psocket = 0;
}
 
bool CZMQAbstractPublishNotifier::SendMessage(const char *command, const void* data, size_t size)
{
    assert(psocket);
 
    /* send three parts, command & data & a LE 4byte sequence number */
    unsigned char msgseq[sizeof(uint32_t)];
    WriteLE32(&msgseq[0], nSequence);
    int rc = zmq_send_multipart(psocket, command, strlen(command), data, size, msgseq, (size_t)sizeof(uint32_t), (void*)0);
    if (rc == -1)
        return false;
 
    /* increment memory only sequence number after sending */
    nSequence++;
 
    return true;
}
 
bool CZMQPublishHashBlockNotifier::NotifyBlock(const CBlockIndex *pindex)
{
    uint256 hash = pindex->GetBlockHash();
    LogPrint(BCLog::ZMQ, "Publish hashblock %s\n", hash.GetHex());
    char data[32];
    for (unsigned int i = 0; i < 32; i++)
        data[31 - i] = hash.begin()[i];
    return SendMessage(MSG_HASHBLOCK, data, 32);
}
 
bool CZMQPublishHashTransactionNotifier::NotifyTransaction(const CTransaction &transaction)
{
    uint256 hash = transaction.GetHash();
    LogPrint(BCLog::ZMQ, "Publish hashtx %s\n", hash.GetHex());
    char data[32];
    for (unsigned int i = 0; i < 32; i++)
        data[31 - i] = hash.begin()[i];
    return SendMessage(MSG_HASHTX, data, 32);
}
 
bool CZMQPublishRawBlockNotifier::NotifyBlock(const CBlockIndex *pindex)
{
    LogPrint(BCLog::ZMQ, "Publish rawblock %s\n", pindex->GetBlockHash().GetHex());
 
    CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
    {
        LOCK(cs_main);
        CBlock block;
        if(!ReadBlockFromDisk(block, pindex))
        {
            zmqError("Can't read block from disk");
            return false;
        }
 
        ss << block;
    }
 
    return SendMessage(MSG_RAWBLOCK, &(*ss.begin()), ss.size());
}
 
bool CZMQPublishRawTransactionNotifier::NotifyTransaction(const CTransaction &transaction)
{
    uint256 hash = transaction.GetHash();
    LogPrint(BCLog::ZMQ, "Publish rawtx %s\n", hash.GetHex());
    CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
    ss << transaction;
    return SendMessage(MSG_RAWTX, &(*ss.begin()), ss.size());
}