retainedmessagesdb.cpp
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/*
This file is part of FlashMQ (https://www.flashmq.org)
Copyright (C) 2021 Wiebe Cazemier
FlashMQ is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, version 3.
FlashMQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public
License along with FlashMQ. If not, see <https://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <exception>
#include <stdexcept>
#include <stdio.h>
#include <cstring>
#include "retainedmessagesdb.h"
#include "utils.h"
#include "logger.h"
#include "mqttpacket.h"
#include "threadglobals.h"
RetainedMessagesDB::RetainedMessagesDB(const std::string &filePath) : PersistenceFile(filePath)
{
}
void RetainedMessagesDB::openWrite()
{
PersistenceFile::openWrite(MAGIC_STRING_V2);
}
void RetainedMessagesDB::openRead()
{
PersistenceFile::openRead();
if (detectedVersionString == MAGIC_STRING_V1)
readVersion = ReadVersion::v1;
else if (detectedVersionString == MAGIC_STRING_V2)
readVersion = ReadVersion::v2;
else
throw std::runtime_error("Unknown file version.");
}
/**
* @brief RetainedMessagesDB::saveData doesn't explicitely name a file version (v1, etc), because we always write the current definition.
* @param messages
*/
void RetainedMessagesDB::saveData(const std::vector<RetainedMessage> &messages)
{
if (!f)
return;
CirBuf cirbuf(1024);
writeUint32(messages.size());
char reserved[RESERVED_SPACE_RETAINED_DB_V2];
std::memset(reserved, 0, RESERVED_SPACE_RETAINED_DB_V2);
writeCheck(reserved, 1, RESERVED_SPACE_RETAINED_DB_V2, f);
for (const RetainedMessage &rm : messages)
{
logger->logf(LOG_DEBUG, "Saving retained message for topic '%s' QoS %d.", rm.publish.topic.c_str(), rm.publish.qos);
Publish pcopy(rm.publish);
MqttPacket pack(ProtocolVersion::Mqtt5, pcopy);
// Dummy, to please the parser on reading.
if (pcopy.qos > 0)
pack.setPacketId(666);
const uint32_t packSize = pack.getSizeIncludingNonPresentHeader();
cirbuf.reset();
cirbuf.ensureFreeSpace(packSize + 32);
pack.readIntoBuf(cirbuf);
writeUint16(pack.getFixedHeaderLength());
writeUint32(packSize);
writeCheck(cirbuf.tailPtr(), 1, cirbuf.usedBytes(), f);
}
fflush(f);
}
std::list<RetainedMessage> RetainedMessagesDB::readData()
{
std::list<RetainedMessage> defaultResult;
if (!f)
return defaultResult;
if (readVersion == ReadVersion::v1)
logger->logf(LOG_WARNING, "File '%s' is version 1, an internal development version that was never finalized. Not reading.", getFilePath().c_str());
if (readVersion == ReadVersion::v2)
return readDataV2();
return defaultResult;
}
std::list<RetainedMessage> RetainedMessagesDB::readDataV2()
{
std::list<RetainedMessage> messages;
CirBuf cirbuf(1024);
const Settings *settings = ThreadGlobals::getSettings();
std::shared_ptr<ThreadData> dummyThreadData;
std::shared_ptr<Client> dummyClient(new Client(0, dummyThreadData, nullptr, false, nullptr, settings, false));
dummyClient->setClientProperties(ProtocolVersion::Mqtt5, "Dummyforloadingretained", "nobody", true, 60);
while (!feof(f))
{
bool eofFound = false;
const uint32_t numberOfMessages = readUint32(eofFound);
if (eofFound)
continue;
fseek(f, RESERVED_SPACE_RETAINED_DB_V2, SEEK_CUR);
for(uint32_t i = 0; i < numberOfMessages; i++)
{
const uint16_t fixed_header_length = readUint16(eofFound);
const uint32_t packlen = readUint32(eofFound);
if (eofFound)
continue;
cirbuf.reset();
cirbuf.ensureFreeSpace(packlen + 32);
readCheck(cirbuf.headPtr(), 1, packlen, f);
cirbuf.advanceHead(packlen);
MqttPacket pack(cirbuf, packlen, fixed_header_length, dummyClient);
pack.parsePublishData();
Publish pub(pack.getPublishData());
RetainedMessage msg(pub);
logger->logf(LOG_DEBUG, "Loading retained message for topic '%s' QoS %d.", msg.publish.topic.c_str(), msg.publish.qos);
messages.push_back(std::move(msg));
}
}
return messages;
}