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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 "Connection.h"
#include "Cluster.h"
#include "qpid/broker/SessionState.h"
#include "qpid/framing/AMQFrame.h"
#include "qpid/framing/AllInvoker.h"
#include "qpid/framing/ClusterConnectionDeliverCloseBody.h"
#include "qpid/framing/ConnectionCloseBody.h"
#include "qpid/framing/ConnectionCloseOkBody.h"
#include "qpid/log/Statement.h"
#include <boost/current_function.hpp>
namespace qpid {
namespace cluster {
using namespace framing;
NoOpConnectionOutputHandler Connection::discardHandler;
// Shadow connections
Connection::Connection(Cluster& c, sys::ConnectionOutputHandler& out,
const std::string& wrappedId, ConnectionId myId)
: cluster(c), self(myId), catchUp(false), output(*this, out),
connection(&output, cluster.getBroker(), wrappedId)
{
QPID_LOG(debug, "New connection: " << *this);
}
// Local connections
Connection::Connection(Cluster& c, sys::ConnectionOutputHandler& out,
const std::string& wrappedId, MemberId myId, bool isCatchUp)
: cluster(c), self(myId, this), catchUp(isCatchUp), output(*this, out),
connection(&output, cluster.getBroker(), wrappedId)
{
QPID_LOG(debug, "New connection: " << *this);
}
Connection::~Connection() {
QPID_LOG(debug, "Deleted connection: " << *this);
}
bool Connection::doOutput() {
return output.doOutput();
}
// Delivery of doOutput allows us to run the real connection doOutput()
// which stocks up the write buffers with data.
//
void Connection::deliverDoOutput(uint32_t requested) {
assert(!catchUp);
output.deliverDoOutput(requested);
}
// Received from a directly connected client.
void Connection::received(framing::AMQFrame& f) {
QPID_LOG(trace, "RECV " << *this << ": " << f);
if (isShadow()) {
// Intercept the close that completes catch-up for shadow a connection.
if (isShadow() && f.getMethod() && f.getMethod()->isA<ConnectionCloseBody>()) {
catchUp = false;
cluster.insert(boost::intrusive_ptr<Connection>(this));
AMQFrame ok(in_place<ConnectionCloseOkBody>());
connection.getOutput().send(ok);
output.setOutputHandler(discardHandler);
}
else
QPID_LOG(warning, *this << " ignoring unexpected frame: " << f);
}
else {
currentChannel = f.getChannel();
if (!framing::invoke(*this, *f.getBody()).wasHandled())
connection.received(f);
}
}
// Delivered from cluster.
void Connection::delivered(framing::AMQFrame& f) {
QPID_LOG(trace, "DLVR " << *this << ": " << f);
assert(!isCatchUp());
// Handle connection controls, deliver other frames to connection.
currentChannel = f.getChannel();
if (!framing::invoke(*this, *f.getBody()).wasHandled())
connection.received(f);
}
void Connection::closed() {
try {
QPID_LOG(debug, "Connection closed " << *this);
if (catchUp) {
QPID_LOG(critical, cluster << " error on catch-up connection " << *this);
cluster.leave();
}
else if (isDump())
connection.closed();
else if (isLocal()) {
// This was a local replicated connection. Multicast a deliver
// closed and process any outstanding frames from the cluster
// until self-delivery of deliver-close.
output.setOutputHandler(discardHandler);
cluster.mcastControl(ClusterConnectionDeliverCloseBody(), this);
++mcastSeq;
}
}
catch (const std::exception& e) {
QPID_LOG(error, QPID_MSG("While closing connection: " << e.what()));
}
}
void Connection::deliverClose () {
assert(!catchUp);
connection.closed();
cluster.erase(self);
}
// Decode data from local clients.
size_t Connection::decode(const char* buffer, size_t size) {
if (catchUp || isDump()) { // Handle catch-up locally.
Buffer buf(const_cast<char*>(buffer), size);
while (localDecoder.decode(buf))
received(localDecoder.frame);
}
else { // Multicast local connections.
assert(isLocal());
cluster.mcastBuffer(buffer, size, self, ++mcastSeq);
}
return size;
}
void Connection::deliverBuffer(Buffer& buf) {
assert(!catchUp);
++deliverSeq;
while (mcastDecoder.decode(buf))
delivered(mcastDecoder.frame);
}
void Connection::sessionState(
const SequenceNumber& replayStart,
const SequenceNumber& sendCommandPoint,
const SequenceSet& sentIncomplete,
const SequenceNumber& expected,
const SequenceNumber& received,
const SequenceSet& unknownCompleted,
const SequenceSet& receivedIncomplete)
{
broker::SessionHandler& h = connection.getChannel(currentChannel);
broker::SessionState* s = h.getSession();
s->setState(
replayStart,
sendCommandPoint,
sentIncomplete,
expected,
received,
unknownCompleted,
receivedIncomplete);
QPID_LOG(debug, "Received session state dump for " << s->getId());
}
void Connection::shadowReady(uint64_t memberId, uint64_t connectionId) {
ConnectionId shadow = ConnectionId(memberId, connectionId);
QPID_LOG(debug, "Catch-up connection " << self << " becomes shadow " << shadow);
self = shadow;
}
void Connection::membership(const FieldTable& urls, const FieldTable& states) {
cluster.dumpInDone(ClusterMap(urls,states));
catchUp = false;
self.second = 0; // Mark this as completed dump connection.
}
bool Connection::isLocal() const { return self.first == cluster.getId() && self.second == this; }
std::ostream& operator<<(std::ostream& o, const Connection& c) {
return o << c.getId() << "(" << (c.isLocal() ? "local" : "shadow")
<< (c.isCatchUp() ? ",catchup" : "") << ")";
}
}} // namespace qpid::cluster
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