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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 "BrokerReplicator.h"
#include "HaBroker.h"
#include "ReplicatingSubscription.h"
#include "Settings.h"
#include "qpid/Url.h"
#include "qpid/amqp_0_10/Codecs.h"
#include "qpid/broker/Bridge.h"
#include "qpid/broker/Broker.h"
#include "qpid/broker/SessionHandler.h"
#include "qpid/broker/Link.h"
#include "qpid/framing/AMQP_ServerProxy.h"
#include "qpid/framing/AMQFrame.h"
#include "qpid/framing/FieldTable.h"
#include "qpid/framing/MessageTransferBody.h"
#include "qpid/sys/SystemInfo.h"
#include "qpid/types/Variant.h"
namespace qpid {
namespace ha {
using namespace framing;
using namespace broker;
using types::Variant;
using std::string;
Backup::Backup(HaBroker& hb, const Settings& s) :
logPrefix("Backup: "), haBroker(hb), broker(hb.getBroker()), settings(s)
{
// Empty brokerUrl means delay initialization until seBrokertUrl() is called.
if (!s.brokerUrl.empty()) initialize(Url(s.brokerUrl));
}
bool Backup::isSelf(const Address& a) const {
return sys::SystemInfo::isLocalHost(a.host) &&
a.port == haBroker.getBroker().getPort(a.protocol);
}
// Remove my own address from the URL if possible.
// This isn't 100% reliable given the many ways to specify a host,
// but should work in most cases. We have additional measures to prevent
// self-connection in ConnectionObserver
Url Backup::removeSelf(const Url& brokers) const {
Url url;
for (Url::const_iterator i = brokers.begin(); i != brokers.end(); ++i)
if (!isSelf(*i)) url.push_back(*i);
if (url.empty())
throw Url::Invalid(logPrefix+"Failover URL is empty");
QPID_LOG(debug, logPrefix << "Failover URL (excluding self): " << url);
return url;
}
void Backup::initialize(const Url& brokers) {
if (brokers.empty()) throw Url::Invalid("HA broker URL is empty");
QPID_LOG(info, logPrefix << "Connecting to cluster, broker URL: " << brokers);
Url url = removeSelf(brokers);
string protocol = url[0].protocol.empty() ? "tcp" : url[0].protocol;
types::Uuid uuid(true);
// Declare the link
std::pair<Link::shared_ptr, bool> result = broker.getLinks().declare(
broker::QPID_NAME_PREFIX + string("ha.link.") + uuid.str(),
url[0].host, url[0].port, protocol,
false, // durable
settings.mechanism, settings.username, settings.password,
false); // no amq.failover - don't want to use client URL.
{
sys::Mutex::ScopedLock l(lock);
link = result.first;
replicator.reset(new BrokerReplicator(haBroker, link));
replicator->initialize();
broker.getExchanges().registerExchange(replicator);
}
link->setUrl(url); // Outside the lock, once set link doesn't change.
}
Backup::~Backup() {
if (link) link->close();
if (replicator.get()) broker.getExchanges().destroy(replicator->getName());
}
// Called via management.
void Backup::setBrokerUrl(const Url& url) {
// Ignore empty URLs seen during start-up for some tests.
if (url.empty()) return;
bool linkSet = false;
{
sys::Mutex::ScopedLock l(lock);
linkSet = link;
}
if (linkSet) {
QPID_LOG(info, logPrefix << "Broker URL set to: " << url);
link->setUrl(removeSelf(url)); // Outside lock, once set link doesn't change
}
else
initialize(url); // Deferred initialization
}
void Backup::setStatus(BrokerStatus status) {
switch (status) {
case READY:
QPID_LOG(notice, logPrefix << "Ready to become primary.");
break;
case CATCHUP:
QPID_LOG(notice, logPrefix << "Catching up on primary, cannot be promoted.");
default:
assert(0);
}
}
}} // namespace qpid::ha
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