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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 "qpid/log/Statement.h"
#include <boost/filesystem/path.hpp>
#include <boost/filesystem/fstream.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/scoped_array.hpp>
#include <fstream>
#include <sstream>
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)
{}
namespace {
const char* SUBDIR="cluster";
const char* STORE_STATUS="store.status";
string readFile(const fs::path& path) {
fs::ifstream is;
is.exceptions(std::ios::badbit | std::ios::failbit);
is.open(path);
// get length of file:
is.seekg (0, ios::end);
size_t length = is.tellg();
is.seekg (0, ios::beg);
// load data
boost::scoped_array<char> buffer(new char[length]);
is.read(buffer.get(), length);
is.close();
return string(buffer.get(), length);
}
void writeFile(const fs::path& path, const string& data) {
fs::ofstream os;
os.exceptions(std::ios::badbit | std::ios::failbit);
os.open(path);
os.write(data.data(), data.size());
os.close();
}
} // 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."));
}
try {
fs::path dir = fs::path(dataDir, fs::native)/SUBDIR;
create_directory(dir);
fs::path file = dir/STORE_STATUS;
if (fs::exists(file)) {
string data = readFile(file);
istringstream is(data);
is.exceptions(std::ios::badbit | std::ios::failbit);
is >> ws >> clusterId >> ws >> shutdownId;
if (!clusterId)
throw Exception(QPID_MSG("Invalid cluster store state, no cluster-id"));
if (shutdownId) state = STORE_STATE_CLEAN_STORE;
else state = STORE_STATE_DIRTY_STORE;
}
else { // Starting from empty store
clusterId = Uuid(true);
save();
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;
try {
ostringstream os;
os << clusterId << endl << shutdownId << endl;
fs::path file = fs::path(dataDir, fs::native)/SUBDIR/STORE_STATUS;
writeFile(file, os.str());
}
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() {
assert(hasStore());
if (shutdownId) {
shutdownId = Uuid();
save();
}
state = STORE_STATE_DIRTY_STORE;
}
void StoreStatus::clean(const Uuid& shutdownId_) {
assert(hasStore());
assert(shutdownId_);
if (shutdownId_ != shutdownId) {
shutdownId = shutdownId_;
save();
}
state = STORE_STATE_CLEAN_STORE;
}
void StoreStatus::setClusterId(const Uuid& clusterId_) {
clusterId = clusterId_;
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();
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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