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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 "qpid/cluster/ErrorCheck.h"
#include "qpid/cluster/EventFrame.h"
#include "qpid/cluster/ClusterMap.h"
#include "qpid/cluster/Cluster.h"
#include "qpid/framing/ClusterErrorCheckBody.h"
#include "qpid/framing/ClusterConfigChangeBody.h"
#include "qpid/log/Statement.h"
#include <algorithm>
namespace qpid {
namespace cluster {
using namespace std;
using namespace framing;
using namespace framing::cluster;
ErrorCheck::ErrorCheck(Cluster& c)
: cluster(c), mcast(c.getMulticast()), frameSeq(0), type(ERROR_TYPE_NONE), connection(0)
{}
void ErrorCheck::error(
Connection& c, ErrorType t, framing::SequenceNumber seq, const MemberSet& ms,
const std::string& msg)
{
// Detected a local error, inform cluster and set error state.
assert(t != ERROR_TYPE_NONE); // Must be an error.
assert(type == ERROR_TYPE_NONE); // Can't be called when already in an error state.
type = t;
unresolved = ms;
frameSeq = seq;
connection = &c;
message = msg;
QPID_LOG(debug, cluster<< (type == ERROR_TYPE_SESSION ? " channel" : " connection")
<< " error " << frameSeq << " on " << c
<< " must be resolved with: " << unresolved
<< ": " << message);
mcast.mcastControl(
ClusterErrorCheckBody(ProtocolVersion(), type, frameSeq), cluster.getId());
// If there are already frames queued up by a previous error, review
// them with respect to this new error.
for (FrameQueue::iterator i = frames.begin(); i != frames.end(); i = review(i))
;
}
void ErrorCheck::delivered(const EventFrame& e) {
frames.push_back(e);
review(frames.end()-1);
}
// Review a frame in the queue with respect to the current error.
ErrorCheck::FrameQueue::iterator ErrorCheck::review(const FrameQueue::iterator& i) {
FrameQueue::iterator next = i+1;
if(!isUnresolved() || !i->frame.getBody() || !i->frame.getMethod())
return next; // Only interested in control frames while unresolved.
const AMQMethodBody* method = i->frame.getMethod();
if (method->isA<const ClusterErrorCheckBody>()) {
const ClusterErrorCheckBody* errorCheck =
static_cast<const ClusterErrorCheckBody*>(method);
if (errorCheck->getFrameSeq() == frameSeq) { // Addresses current error
next = frames.erase(i); // Drop matching error check controls
if (errorCheck->getType() < type) { // my error is worse than his
QPID_LOG(critical, cluster
<< " local error " << frameSeq << " did not occur on member "
<< i->getMemberId()
<< ": " << message);
throw Exception(
QPID_MSG("local error did not occur on all cluster members " << ": " << message));
}
else { // his error is worse/same as mine.
QPID_LOG(debug, cluster << " error " << frameSeq
<< " resolved with " << i->getMemberId());
unresolved.erase(i->getMemberId());
checkResolved();
}
}
else if (errorCheck->getFrameSeq() < frameSeq && errorCheck->getType() != NONE
&& i->connectionId.getMember() != cluster.getId())
{
// This error occured before the current error so we
// have processed past it.
next = frames.erase(i); // Drop the error check control
respondNone(i->connectionId.getMember(), errorCheck->getType(),
errorCheck->getFrameSeq());
}
// if errorCheck->getFrameSeq() > frameSeq then leave it in the queue.
}
else if (method->isA<const ClusterConfigChangeBody>()) {
const ClusterConfigChangeBody* configChange =
static_cast<const ClusterConfigChangeBody*>(method);
if (configChange) {
MemberSet members(decodeMemberSet(configChange->getMembers()));
QPID_LOG(debug, cluster << " apply config change to error "
<< frameSeq << ": " << members);
MemberSet intersect;
set_intersection(members.begin(), members.end(),
unresolved.begin(), unresolved.end(),
inserter(intersect, intersect.begin()));
unresolved.swap(intersect);
checkResolved();
}
}
return next;
}
void ErrorCheck::checkResolved() {
if (unresolved.empty()) { // No more potentially conflicted members, we're clear.
type = ERROR_TYPE_NONE;
QPID_LOG(debug, cluster << " error " << frameSeq << " resolved.");
}
else
QPID_LOG(debug, cluster << " error " << frameSeq
<< " must be resolved with " << unresolved);
}
EventFrame ErrorCheck::getNext() {
assert(canProcess());
EventFrame e(frames.front());
frames.pop_front();
return e;
}
void ErrorCheck::respondNone(const MemberId& from, uint8_t type, framing::SequenceNumber frameSeq) {
// Don't respond to non-errors or to my own errors.
if (type == ERROR_TYPE_NONE || from == cluster.getId())
return;
QPID_LOG(debug, cluster << " error " << frameSeq << " did not occur locally.");
mcast.mcastControl(
ClusterErrorCheckBody(ProtocolVersion(), ERROR_TYPE_NONE, frameSeq),
cluster.getId()
);
}
}} // namespace qpid::cluster
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