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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 "StoreStatus.h"
#include "qpid/Exception.h"
#include "qpid/Msg.h"
#include <boost/filesystem/path.hpp>
#include <boost/filesystem/fstream.hpp>
#include <boost/filesystem/operations.hpp>
#include <fstream>
namespace qpid {
namespace cluster {
using framing::Uuid;
using namespace framing::cluster;
namespace fs=boost::filesystem;
using namespace std;
StoreStatus::StoreStatus(const std::string& d)
: state(STORE_STATE_NO_STORE), dataDir(d), configSeq(0)
{}
namespace {
const char* SUBDIR="cluster";
const char* CLUSTER_ID_FILE="cluster.uuid";
const char* SHUTDOWN_ID_FILE="shutdown.uuid";
const char* CONFIG_SEQ_FILE="config.seq";
void throw_exceptions(ios& ios) {
// Have stream throw an exception on error.
ios.exceptions(std::ios::badbit | std::ios::failbit);
}
Uuid loadUuid(const fs::path& path) {
Uuid ret;
if (exists(path)) {
fs::ifstream i(path);
throw_exceptions(i);
i >> ret;
}
return ret;
}
void saveUuid(const fs::path& path, const Uuid& uuid) {
fs::ofstream o(path);
throw_exceptions(o);
o << uuid;
}
framing::SequenceNumber loadSeqNum(const fs::path& path) {
uint32_t n = 0;
if (exists(path)) {
fs::ifstream i(path);
throw_exceptions(i);
i >> n;
}
return framing::SequenceNumber(n);
}
} // namespace
void StoreStatus::load() {
if (dataDir.empty()) {
throw Exception(QPID_MSG("No data-dir: When a store is loaded together with clustering, --data-dir must be specified."));
}
fs::path dir = fs::path(dataDir, fs::native)/SUBDIR;
try {
create_directory(dir);
clusterId = loadUuid(dir/CLUSTER_ID_FILE);
shutdownId = loadUuid(dir/SHUTDOWN_ID_FILE);
configSeq = loadSeqNum(dir/CONFIG_SEQ_FILE);
if (clusterId && shutdownId) state = STORE_STATE_CLEAN_STORE;
else if (clusterId) state = STORE_STATE_DIRTY_STORE;
else state = STORE_STATE_EMPTY_STORE;
}
catch (const std::exception&e) {
throw Exception(QPID_MSG("Cannot load cluster store status: " << e.what()));
}
}
void StoreStatus::save() {
if (dataDir.empty()) return;
fs::path dir = fs::path(dataDir, fs::native)/SUBDIR;
try {
create_directory(dir);
saveUuid(dir/CLUSTER_ID_FILE, clusterId);
saveUuid(dir/SHUTDOWN_ID_FILE, shutdownId);
fs::ofstream o(dir/CONFIG_SEQ_FILE);
throw_exceptions(o);
o << configSeq.getValue();
}
catch (const std::exception&e) {
throw Exception(QPID_MSG("Cannot save cluster store status: " << e.what()));
}
}
bool StoreStatus::hasStore() const {
return state != framing::cluster::STORE_STATE_NO_STORE;
}
void StoreStatus::dirty(const Uuid& clusterId_) {
if (!hasStore()) return;
assert(clusterId_);
clusterId = clusterId_;
shutdownId = Uuid();
state = STORE_STATE_DIRTY_STORE;
save();
}
void StoreStatus::clean(const Uuid& shutdownId_) {
if (!hasStore()) return;
assert(shutdownId_);
state = STORE_STATE_CLEAN_STORE;
shutdownId = shutdownId_;
save();
}
void StoreStatus::setConfigSeq(framing::SequenceNumber seq) {
configSeq = seq;
save();
}
const char* stateName(StoreState s) {
switch (s) {
case STORE_STATE_NO_STORE: return "none";
case STORE_STATE_EMPTY_STORE: return "empty";
case STORE_STATE_DIRTY_STORE: return "dirty";
case STORE_STATE_CLEAN_STORE: return "clean";
}
assert(0);
return "unknown";
}
ostream& operator<<(ostream& o, framing::cluster::StoreState s) { return o << stateName(s); }
ostream& operator<<(ostream& o, const StoreStatus& s) {
o << s.getState();
if (s.getState() == STORE_STATE_DIRTY_STORE)
o << " cluster-id=" << s.getClusterId()
<< " config-sequence=" << s.getConfigSeq();
if (s.getState() == STORE_STATE_CLEAN_STORE) {
o << " cluster-id=" << s.getClusterId()
<< " shutdown-id=" << s.getShutdownId();
}
return o;
}
}} // namespace qpid::cluster
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