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// Copyright (c) 2015-2022 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 <zmq/zmqpublishnotifier.h>
#include <chain.h>
#include <chainparams.h>
#include <crypto/common.h>
#include <kernel/cs_main.h>
#include <logging.h>
#include <netaddress.h>
#include <netbase.h>
#include <node/blockstorage.h>
#include <primitives/block.h>
#include <primitives/transaction.h>
#include <rpc/server.h>
#include <serialize.h>
#include <streams.h>
#include <sync.h>
#include <uint256.h>
#include <version.h>
#include <zmq/zmqutil.h>
#include <zmq.h>
#include <cassert>
#include <cstdarg>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <map>
#include <optional>
#include <string>
#include <utility>
#include <vector>
namespace Consensus {
struct Params;
}
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";
static const char *MSG_SEQUENCE = "sequence";
// 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;
}
static bool IsZMQAddressIPV6(const std::string &zmq_address)
{
const std::string tcp_prefix = "tcp://";
const size_t tcp_index = zmq_address.rfind(tcp_prefix);
const size_t colon_index = zmq_address.rfind(':');
if (tcp_index == 0 && colon_index != std::string::npos) {
const std::string ip = zmq_address.substr(tcp_prefix.length(), colon_index - tcp_prefix.length());
const std::optional<CNetAddr> addr{LookupHost(ip, false)};
if (addr.has_value() && addr.value().IsIPv6()) return true;
}
return false;
}
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;
}
LogPrint(BCLog::ZMQ, "Outbound message high water mark for %s at %s is %d\n", type, address, outbound_message_high_water_mark);
int rc = zmq_setsockopt(psocket, ZMQ_SNDHWM, &outbound_message_high_water_mark, sizeof(outbound_message_high_water_mark));
if (rc != 0)
{
zmqError("Failed to set outbound message high water mark");
zmq_close(psocket);
return false;
}
const int so_keepalive_option {1};
rc = zmq_setsockopt(psocket, ZMQ_TCP_KEEPALIVE, &so_keepalive_option, sizeof(so_keepalive_option));
if (rc != 0) {
zmqError("Failed to set SO_KEEPALIVE");
zmq_close(psocket);
return false;
}
// On some systems (e.g. OpenBSD) the ZMQ_IPV6 must not be enabled, if the address to bind isn't IPv6
const int enable_ipv6 { IsZMQAddressIPV6(address) ? 1 : 0};
rc = zmq_setsockopt(psocket, ZMQ_IPV6, &enable_ipv6, sizeof(enable_ipv6));
if (rc != 0) {
zmqError("Failed to set ZMQ_IPV6");
zmq_close(psocket);
return false;
}
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.insert(std::make_pair(address, this));
return true;
}
else
{
LogPrint(BCLog::ZMQ, "Reusing socket for address %s\n", address);
LogPrint(BCLog::ZMQ, "Outbound message high water mark for %s at %s is %d\n", type, address, outbound_message_high_water_mark);
psocket = i->second->psocket;
mapPublishNotifiers.insert(std::make_pair(address, this));
return true;
}
}
void CZMQAbstractPublishNotifier::Shutdown()
{
// Early return if Initialize was not called
if (!psocket) return;
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 = nullptr;
}
bool CZMQAbstractPublishNotifier::SendZmqMessage(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, nSequence);
int rc = zmq_send_multipart(psocket, command, strlen(command), data, size, msgseq, (size_t)sizeof(uint32_t), nullptr);
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 to %s\n", hash.GetHex(), this->address);
uint8_t data[32];
for (unsigned int i = 0; i < 32; i++) {
data[31 - i] = hash.begin()[i];
}
return SendZmqMessage(MSG_HASHBLOCK, data, 32);
}
bool CZMQPublishHashTransactionNotifier::NotifyTransaction(const CTransaction &transaction)
{
uint256 hash = transaction.GetHash();
LogPrint(BCLog::ZMQ, "Publish hashtx %s to %s\n", hash.GetHex(), this->address);
uint8_t data[32];
for (unsigned int i = 0; i < 32; i++) {
data[31 - i] = hash.begin()[i];
}
return SendZmqMessage(MSG_HASHTX, data, 32);
}
bool CZMQPublishRawBlockNotifier::NotifyBlock(const CBlockIndex *pindex)
{
LogPrint(BCLog::ZMQ, "Publish rawblock %s to %s\n", pindex->GetBlockHash().GetHex(), this->address);
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION | RPCSerializationFlags());
CBlock block;
if (!m_get_block_by_index(block, *pindex)) {
zmqError("Can't read block from disk");
return false;
}
ss << block;
return SendZmqMessage(MSG_RAWBLOCK, &(*ss.begin()), ss.size());
}
bool CZMQPublishRawTransactionNotifier::NotifyTransaction(const CTransaction &transaction)
{
uint256 hash = transaction.GetHash();
LogPrint(BCLog::ZMQ, "Publish rawtx %s to %s\n", hash.GetHex(), this->address);
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION | RPCSerializationFlags());
ss << transaction;
return SendZmqMessage(MSG_RAWTX, &(*ss.begin()), ss.size());
}
// Helper function to send a 'sequence' topic message with the following structure:
// <32-byte hash> | <1-byte label> | <8-byte LE sequence> (optional)
static bool SendSequenceMsg(CZMQAbstractPublishNotifier& notifier, uint256 hash, char label, std::optional<uint64_t> sequence = {})
{
unsigned char data[sizeof(hash) + sizeof(label) + sizeof(uint64_t)];
for (unsigned int i = 0; i < sizeof(hash); ++i) {
data[sizeof(hash) - 1 - i] = hash.begin()[i];
}
data[sizeof(hash)] = label;
if (sequence) WriteLE64(data + sizeof(hash) + sizeof(label), *sequence);
return notifier.SendZmqMessage(MSG_SEQUENCE, data, sequence ? sizeof(data) : sizeof(hash) + sizeof(label));
}
bool CZMQPublishSequenceNotifier::NotifyBlockConnect(const CBlockIndex *pindex)
{
uint256 hash = pindex->GetBlockHash();
LogPrint(BCLog::ZMQ, "Publish sequence block connect %s to %s\n", hash.GetHex(), this->address);
return SendSequenceMsg(*this, hash, /* Block (C)onnect */ 'C');
}
bool CZMQPublishSequenceNotifier::NotifyBlockDisconnect(const CBlockIndex *pindex)
{
uint256 hash = pindex->GetBlockHash();
LogPrint(BCLog::ZMQ, "Publish sequence block disconnect %s to %s\n", hash.GetHex(), this->address);
return SendSequenceMsg(*this, hash, /* Block (D)isconnect */ 'D');
}
bool CZMQPublishSequenceNotifier::NotifyTransactionAcceptance(const CTransaction &transaction, uint64_t mempool_sequence)
{
uint256 hash = transaction.GetHash();
LogPrint(BCLog::ZMQ, "Publish hashtx mempool acceptance %s to %s\n", hash.GetHex(), this->address);
return SendSequenceMsg(*this, hash, /* Mempool (A)cceptance */ 'A', mempool_sequence);
}
bool CZMQPublishSequenceNotifier::NotifyTransactionRemoval(const CTransaction &transaction, uint64_t mempool_sequence)
{
uint256 hash = transaction.GetHash();
LogPrint(BCLog::ZMQ, "Publish hashtx mempool removal %s to %s\n", hash.GetHex(), this->address);
return SendSequenceMsg(*this, hash, /* Mempool (R)emoval */ 'R', mempool_sequence);
}
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