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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
#include "Backup.h"
#include "ConnectionExcluder.h"
#include "HaBroker.h"
#include "Settings.h"
#include "ReplicatingSubscription.h"
#include "qpid/Exception.h"
#include "qpid/broker/Broker.h"
#include "qpid/broker/Link.h"
#include "qpid/broker/Queue.h"
#include "qpid/broker/SignalHandler.h"
#include "qpid/management/ManagementAgent.h"
#include "qmf/org/apache/qpid/ha/Package.h"
#include "qmf/org/apache/qpid/ha/ArgsHaBrokerReplicate.h"
#include "qmf/org/apache/qpid/ha/ArgsHaBrokerSetBrokers.h"
#include "qmf/org/apache/qpid/ha/ArgsHaBrokerSetPublicBrokers.h"
#include "qmf/org/apache/qpid/ha/ArgsHaBrokerSetExpectedBackups.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace ha {
namespace _qmf = ::qmf::org::apache::qpid::ha;
using namespace management;
using namespace std;
namespace {
const std::string STANDALONE="standalone";
const std::string CATCH_UP="catch-up";
const std::string BACKUP="backup";
const std::string PRIMARY="primary";
} // namespace
HaBroker::HaBroker(broker::Broker& b, const Settings& s)
: broker(b),
settings(s),
mgmtObject(0)
{
// Register a factory for replicating subscriptions.
broker.getConsumerFactories().add(
boost::shared_ptr<ReplicatingSubscription::Factory>(
new ReplicatingSubscription::Factory()));
broker.getKnownBrokers = boost::bind(&HaBroker::getKnownBrokers, this);
ManagementAgent* ma = broker.getManagementAgent();
if (!ma)
throw Exception("Cannot start HA: management is disabled");
_qmf::Package packageInit(ma);
mgmtObject = new _qmf::HaBroker(ma, this, "ha-broker");
mgmtObject->set_status(BACKUP);
mgmtObject->set_replicateDefault(str(settings.replicateDefault));
ma->addObject(mgmtObject);
// NOTE: lock is not needed in a constructor but we created it just to pass
// to the set functions.
sys::Mutex::ScopedLock l(lock);
if (!settings.clientUrl.empty()) setClientUrl(Url(settings.clientUrl), l);
if (!settings.brokerUrl.empty()) setBrokerUrl(Url(settings.brokerUrl), l);
// If we are in a cluster, we start in backup mode.
if (settings.cluster) backup.reset(new Backup(*this, s));
}
HaBroker::~HaBroker() {}
Manageable::status_t HaBroker::ManagementMethod (uint32_t methodId, Args& args, string&) {
sys::Mutex::ScopedLock l(lock);
switch (methodId) {
case _qmf::HaBroker::METHOD_PROMOTE: {
if (backup.get()) { // I am a backup
// NOTE: resetting backup allows client connections, so any
// primary state should be set up here before backup.reset()
backup.reset();
QPID_LOG(notice, "HA: Primary promoted from backup");
mgmtObject->set_status(PRIMARY);
}
break;
}
case _qmf::HaBroker::METHOD_SETBROKERS: {
setBrokerUrl(Url(dynamic_cast<_qmf::ArgsHaBrokerSetBrokers&>(args).i_url), l);
break;
}
case _qmf::HaBroker::METHOD_SETPUBLICBROKERS: {
setClientUrl(Url(dynamic_cast<_qmf::ArgsHaBrokerSetPublicBrokers&>(args).i_url), l);
break;
}
case _qmf::HaBroker::METHOD_SETEXPECTEDBACKUPS: {
setExpectedBackups(dynamic_cast<_qmf::ArgsHaBrokerSetExpectedBackups&>(args).i_expectedBackups, l);
break;
}
case _qmf::HaBroker::METHOD_REPLICATE: {
_qmf::ArgsHaBrokerReplicate& bq_args =
dynamic_cast<_qmf::ArgsHaBrokerReplicate&>(args);
QPID_LOG(debug, "HA replicating individual queue "<< bq_args.i_queue << " from " << bq_args.i_broker);
boost::shared_ptr<broker::Queue> queue = broker.getQueues().get(bq_args.i_queue);
Url url(bq_args.i_broker);
string protocol = url[0].protocol.empty() ? "tcp" : url[0].protocol;
std::pair<broker::Link::shared_ptr, bool> result = broker.getLinks().declare(
url[0].host, url[0].port, protocol,
false, // durable
settings.mechanism, settings.username, settings.password);
boost::shared_ptr<broker::Link> link = result.first;
link->setUrl(url);
// Create a queue replicator
boost::shared_ptr<QueueReplicator> qr(new QueueReplicator(queue, link));
broker.getExchanges().registerExchange(qr);
qr->activate();
break;
}
default:
return Manageable::STATUS_UNKNOWN_METHOD;
}
return Manageable::STATUS_OK;
}
void HaBroker::setClientUrl(const Url& url, const sys::Mutex::ScopedLock& l) {
if (url.empty()) throw Exception("Invalid empty URL for HA client failover");
clientUrl = url;
updateClientUrl(l);
}
void HaBroker::updateClientUrl(const sys::Mutex::ScopedLock&) {
Url url = clientUrl.empty() ? brokerUrl : clientUrl;
assert(!url.empty());
mgmtObject->set_publicBrokers(url.str());
knownBrokers.clear();
knownBrokers.push_back(url);
QPID_LOG(debug, "HA: Setting client URL to: " << url);
}
void HaBroker::setBrokerUrl(const Url& url, const sys::Mutex::ScopedLock& l) {
if (url.empty()) throw Exception("Invalid empty URL for HA broker failover");
QPID_LOG(debug, "HA: Setting broker URL to: " << url);
brokerUrl = url;
mgmtObject->set_brokers(brokerUrl.str());
if (backup.get()) backup->setBrokerUrl(brokerUrl);
// Updating broker URL also updates defaulted client URL:
if (clientUrl.empty()) updateClientUrl(l);
}
void HaBroker::setExpectedBackups(size_t n, const sys::Mutex::ScopedLock&) {
expectedBackups = n;
mgmtObject->set_expectedBackups(n);
}
std::vector<Url> HaBroker::getKnownBrokers() const {
return knownBrokers;
}
void HaBroker::shutdown(const std::string& message) {
QPID_LOG(critical, "Shutting down: " << message);
broker::SignalHandler::shutdown();
}
}} // namespace qpid::ha
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