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// Copyright (c) 2015-2019 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/zmqnotificationinterface.h>
#include <zmq/zmqpublishnotifier.h>
#include <zmq/zmqutil.h>
#include <zmq.h>
#include <validation.h>
#include <util/system.h>
CZMQNotificationInterface::CZMQNotificationInterface() : pcontext(nullptr)
{
}
CZMQNotificationInterface::~CZMQNotificationInterface()
{
Shutdown();
}
std::list<const CZMQAbstractNotifier*> CZMQNotificationInterface::GetActiveNotifiers() const
{
std::list<const CZMQAbstractNotifier*> result;
for (const auto& n : notifiers) {
result.push_back(n.get());
}
return result;
}
CZMQNotificationInterface* CZMQNotificationInterface::Create()
{
std::map<std::string, CZMQNotifierFactory> factories;
factories["pubhashblock"] = CZMQAbstractNotifier::Create<CZMQPublishHashBlockNotifier>;
factories["pubhashtx"] = CZMQAbstractNotifier::Create<CZMQPublishHashTransactionNotifier>;
factories["pubrawblock"] = CZMQAbstractNotifier::Create<CZMQPublishRawBlockNotifier>;
factories["pubrawtx"] = CZMQAbstractNotifier::Create<CZMQPublishRawTransactionNotifier>;
std::list<std::unique_ptr<CZMQAbstractNotifier>> notifiers;
for (const auto& entry : factories)
{
std::string arg("-zmq" + entry.first);
if (gArgs.IsArgSet(arg))
{
const auto& factory = entry.second;
const std::string address = gArgs.GetArg(arg, "");
std::unique_ptr<CZMQAbstractNotifier> notifier = factory();
notifier->SetType(entry.first);
notifier->SetAddress(address);
notifier->SetOutboundMessageHighWaterMark(static_cast<int>(gArgs.GetArg(arg + "hwm", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM)));
notifiers.push_back(std::move(notifier));
}
}
if (!notifiers.empty())
{
std::unique_ptr<CZMQNotificationInterface> notificationInterface(new CZMQNotificationInterface());
notificationInterface->notifiers = std::move(notifiers);
if (notificationInterface->Initialize()) {
return notificationInterface.release();
}
}
return nullptr;
}
// Called at startup to conditionally set up ZMQ socket(s)
bool CZMQNotificationInterface::Initialize()
{
int major = 0, minor = 0, patch = 0;
zmq_version(&major, &minor, &patch);
LogPrint(BCLog::ZMQ, "zmq: version %d.%d.%d\n", major, minor, patch);
LogPrint(BCLog::ZMQ, "zmq: Initialize notification interface\n");
assert(!pcontext);
pcontext = zmq_ctx_new();
if (!pcontext)
{
zmqError("Unable to initialize context");
return false;
}
for (auto& notifier : notifiers) {
if (notifier->Initialize(pcontext)) {
LogPrint(BCLog::ZMQ, "zmq: Notifier %s ready (address = %s)\n", notifier->GetType(), notifier->GetAddress());
} else {
LogPrint(BCLog::ZMQ, "zmq: Notifier %s failed (address = %s)\n", notifier->GetType(), notifier->GetAddress());
return false;
}
}
return true;
}
// Called during shutdown sequence
void CZMQNotificationInterface::Shutdown()
{
LogPrint(BCLog::ZMQ, "zmq: Shutdown notification interface\n");
if (pcontext)
{
for (auto& notifier : notifiers) {
LogPrint(BCLog::ZMQ, "zmq: Shutdown notifier %s at %s\n", notifier->GetType(), notifier->GetAddress());
notifier->Shutdown();
}
zmq_ctx_term(pcontext);
pcontext = nullptr;
}
}
namespace {
template <typename Function>
void TryForEachAndRemoveFailed(std::list<std::unique_ptr<CZMQAbstractNotifier>>& notifiers, const Function& func)
{
for (auto i = notifiers.begin(); i != notifiers.end(); ) {
CZMQAbstractNotifier* notifier = i->get();
if (func(notifier)) {
++i;
} else {
notifier->Shutdown();
i = notifiers.erase(i);
}
}
}
} // anonymous namespace
void CZMQNotificationInterface::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload)
{
if (fInitialDownload || pindexNew == pindexFork) // In IBD or blocks were disconnected without any new ones
return;
TryForEachAndRemoveFailed(notifiers, [pindexNew](CZMQAbstractNotifier* notifier) {
return notifier->NotifyBlock(pindexNew);
});
}
void CZMQNotificationInterface::TransactionAddedToMempool(const CTransactionRef& ptx)
{
// Used by BlockConnected and BlockDisconnected as well, because they're
// all the same external callback.
const CTransaction& tx = *ptx;
TryForEachAndRemoveFailed(notifiers, [&tx](CZMQAbstractNotifier* notifier) {
return notifier->NotifyTransaction(tx);
});
}
void CZMQNotificationInterface::BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindexConnected)
{
for (const CTransactionRef& ptx : pblock->vtx) {
// Do a normal notify for each transaction added in the block
TransactionAddedToMempool(ptx);
}
}
void CZMQNotificationInterface::BlockDisconnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindexDisconnected)
{
for (const CTransactionRef& ptx : pblock->vtx) {
// Do a normal notify for each transaction removed in block disconnection
TransactionAddedToMempool(ptx);
}
}
CZMQNotificationInterface* g_zmq_notification_interface = nullptr;
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