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mainapp.cpp
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/*
This file is part of FlashMQ (https://www.flashmq.org)
Copyright (C) 2021-2023 Wiebe Cazemier
FlashMQ is free software: you can redistribute it and/or modify
it under the terms of The Open Software License 3.0 (OSL-3.0).
See LICENSE for license details.
*/
#include "mainapp.h"
#include <cassert>
#include "exceptions.h"
#include <getopt.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/sysinfo.h>
#include <arpa/inet.h>
#include <memory>
#include <malloc.h>
#include <netinet/tcp.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include "logger.h"
#include "threadglobals.h"
#include "threadloop.h"
#include "threadglobals.h"
#include "globalstats.h"
#include "utils.h"
#include "bridgeconfig.h"
#include "bridgeinfodb.h"
#include "globals.h"
MainApp *MainApp::instance = nullptr;
MainApp::MainApp(const std::string &configFilePath) :
subscriptionStore(std::make_shared<SubscriptionStore>())
{
epollFdAccept = check<std::runtime_error>(epoll_create(999));
taskEventFd = eventfd(0, EFD_NONBLOCK);
confFileParser = std::make_unique<ConfigFileParser>(configFilePath);
loadConfig(false);
this->num_threads = get_nprocs();
if (settings.threadCount > 0)
{
this->num_threads = settings.threadCount;
logger->logf(LOG_NOTICE, "%d threads specified by 'thread_count'.", num_threads);
}
else
{
logger->logf(LOG_NOTICE, "%d CPUs are detected, making as many threads. Use 'thread_count' setting to override.", num_threads);
}
if (num_threads <= 0)
throw std::runtime_error("Invalid number of CPUs: " + std::to_string(num_threads));
if (!settings.storageDir.empty())
{
const std::string retainedDbPath = settings.getRetainedMessagesDBFile();
if (settings.retainedMessagesMode == RetainedMessagesMode::Enabled)
subscriptionStore->loadRetainedMessages(settings.getRetainedMessagesDBFile());
else
logger->logf(LOG_INFO, "Not loading '%s', because 'retained_messages_mode' is not 'enabled'.", retainedDbPath.c_str());
subscriptionStore->loadSessionsAndSubscriptions(settings.getSessionsDBFile());
}
}
MainApp::~MainApp()
{
if (taskEventFd >= 0)
close(taskEventFd);
if (epollFdAccept >= 0)
close(epollFdAccept);
}
void MainApp::doHelp(const char *arg)
{
puts("FlashMQ - the scalable light-weight MQTT broker");
puts("");
printf("Usage: %s [options]\n", arg);
puts("");
puts(" -h, --help Print help");
puts(" -c, --config-file <flashmq.conf> Configuration file. Default '/etc/flashmq/flashmq.conf'.");
puts(" -t, --test-config Test configuration file.");
#ifndef NDEBUG
puts(" -z, --fuzz-file <inputdata.dat> For fuzzing, provides the bytes that would be sent by a client.");
puts(" If the name contains 'web' it will activate websocket mode.");
puts(" If the name also contains 'upgrade', it will assume the websocket");
puts(" client is upgrade, and bypass the cryptograhically secured websocket");
puts(" handshake.");
#endif
puts(" -V, --version Show version");
puts(" -l, --license Show license");
}
void MainApp::showLicense()
{
std::string sse = "without SSE support";
#ifdef __SSE4_2__
sse = "with SSE4.2 support";
#endif
printf("FlashMQ Version %s %s\n", FLASHMQ_VERSION, sse.c_str());
puts("Copyright (C) 2021-2025 Wiebe Cazemier.");
puts("License OSL3: Open Software License 3.0 <https://opensource.org/license/osl-3-0-php/>.");
puts("");
puts("Author: Wiebe Cazemier <wiebe@flashmq.org>");
}
std::list<ScopedSocket> MainApp::createListenSocket(const std::shared_ptr<Listener> &listener)
{
std::list<ScopedSocket> result;
if (listener->port <= 0)
return result;
bool error = false;
for (ListenerProtocol p : std::list<ListenerProtocol>({ ListenerProtocol::IPv4, ListenerProtocol::IPv6}))
{
std::string pname = p == ListenerProtocol::IPv4 ? "IPv4" : "IPv6";
int family = p == ListenerProtocol::IPv4 ? AF_INET : AF_INET6;
if (!(listener->protocol == ListenerProtocol::IPv46 || listener->protocol == p))
continue;
try
{
std::string haproxy = "";
if (listener->isHaProxy())
haproxy = "haproxy ";
logger->logf(LOG_NOTICE, "Creating %s %s %slistener on [%s]:%d", pname.c_str(), listener->getProtocolName().c_str(),
haproxy.c_str(), listener->getBindAddress(p).c_str(), listener->port);
BindAddr bindAddr = getBindAddr(family, listener->getBindAddress(p), listener->port);
ScopedSocket uniqueListenFd(check<std::runtime_error>(socket(family, SOCK_STREAM, 0)), listener);
// Not needed for now. Maybe I will make multiple accept threads later, with SO_REUSEPORT.
int optval = 1;
check<std::runtime_error>(setsockopt(uniqueListenFd.get(), SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &optval, sizeof(optval)));
if (listener->isTcpNoDelay())
{
int tcp_nodelay_optval = 1;
check<std::runtime_error>(setsockopt(uniqueListenFd.get(), IPPROTO_TCP, TCP_NODELAY, &tcp_nodelay_optval, sizeof(tcp_nodelay_optval)));
}
int flags = fcntl(uniqueListenFd.get(), F_GETFL);
check<std::runtime_error>(fcntl(uniqueListenFd.get(), F_SETFL, flags | O_NONBLOCK ));
check<std::runtime_error>(bind(uniqueListenFd.get(), bindAddr.get(), bindAddr.getLen()));
check<std::runtime_error>(listen(uniqueListenFd.get(), 32768));
struct epoll_event ev;
memset(&ev, 0, sizeof (struct epoll_event));
ev.data.fd = uniqueListenFd.get();
ev.events = EPOLLIN;
check<std::runtime_error>(epoll_ctl(this->epollFdAccept, EPOLL_CTL_ADD, uniqueListenFd.get(), &ev));
result.push_back(std::move(uniqueListenFd));
}
catch (std::exception &ex)
{
logger->logf(LOG_ERR, "Creating %s %s listener on [%s]:%d failed: %s", pname.c_str(), listener->getProtocolName().c_str(),
listener->getBindAddress(p).c_str(), listener->port, ex.what());
error = true;
}
}
if (error)
return std::list<ScopedSocket>();
return result;
}
void MainApp::wakeUpThread()
{
uint64_t one = 1;
check<std::runtime_error>(write(taskEventFd, &one, sizeof(uint64_t)));
}
void MainApp::queueKeepAliveCheckAtAllThreads()
{
for (ThreadDataOwner &thread : threads)
{
thread->queueDoKeepAliveCheck();
}
}
void MainApp::queuePasswordFileReloadAllThreads()
{
for (ThreadDataOwner &thread : threads)
{
thread->queuePasswdFileReload();
}
}
void MainApp::queuepluginPeriodicEventAllThreads()
{
for (ThreadDataOwner &thread : threads)
{
thread->queuepluginPeriodicEvent();
}
}
void MainApp::setFuzzFile(const std::string &fuzzFilePath)
{
this->fuzzFilePath = fuzzFilePath;
}
/**
* @brief MainApp::queuePublishStatsOnDollarTopic publishes the dollar topics, on a thread that has thread local authentication.
*/
void MainApp::queuePublishStatsOnDollarTopic()
{
if (!threads.empty())
{
std::vector<std::shared_ptr<ThreadData>> thread_datas;
for(ThreadDataOwner &t : threads)
{
thread_datas.push_back(t.getThreadData());
}
threads.at(0)->queuePublishStatsOnDollarTopic(thread_datas);
}
}
/**
* @brief MainApp::saveStateInThread starts a thread for disk IO, because file IO is not async.
*/
void MainApp::saveStateInThread()
{
std::list<BridgeInfoForSerializing> bridgeInfos = BridgeInfoForSerializing::getBridgeInfosForSerializing(this->bridgeConfigs);
auto f = std::bind(&MainApp::saveState, this->settings, bridgeInfos, true);
this->bgWorker.addTask(f, true);
}
void MainApp::queueSendQueuedWills()
{
if (!threads.empty())
{
int threadnr = rand() % threads.size();
std::shared_ptr<ThreadData> t = threads[threadnr].getThreadData();
t->queueSendingQueuedWills();
}
}
void MainApp::waitForWillsQueued()
{
int i = 0;
while(std::any_of(threads.begin(), threads.end(), [](const ThreadDataOwner &t){ return !t->allWillsQueued && t->running; }) && i++ < 5000)
{
usleep(1000);
}
}
void MainApp::queueRetainedMessageExpiration()
{
if (!threads.empty())
{
int threadnr = rand() % threads.size();
std::shared_ptr<ThreadData> t = threads[threadnr].getThreadData();
t->queueRemoveExpiredRetainedMessages();
}
}
void MainApp::sendBridgesToThreads()
{
if (threads.empty())
return;
int i = 0;
auto bridge_pos = this->bridgeConfigs.begin();
while (bridge_pos != this->bridgeConfigs.end())
{
auto cur = bridge_pos;
bridge_pos++;
std::shared_ptr<BridgeConfig> bridge = cur->second;
if (!bridge)
continue;
std::shared_ptr<ThreadData> owner = bridge->owner.lock();
if (!owner)
{
owner = threads.at(i++ % threads.size()).getThreadData();
bridge->owner = owner;
}
if (bridge->queueForDelete)
{
owner->removeBridgeQueued(bridge, "Bridge disappeared from config");
this->bridgeConfigs.erase(cur);
}
else
{
std::shared_ptr<BridgeState> bridgeState = std::make_shared<BridgeState>(*bridge);
bridgeState->threadData = owner;
owner->giveBridge(bridgeState);
}
}
}
void MainApp::queueBridgeReconnectAllThreads(bool alsoQueueNexts)
{
try
{
for (ThreadDataOwner &thread : threads)
{
thread->queueBridgeReconnect();
}
}
catch (std::exception &ex)
{
Logger *logger = Logger::getInstance();
logger->logf(LOG_ERR, ex.what());
}
if (alsoQueueNexts)
{
auto fReconnectBridges = std::bind(&MainApp::queueBridgeReconnectAllThreads, this, false);
timed_tasks.addTask(fReconnectBridges, 5000, true);
}
}
void MainApp::queueInternalHeartbeat()
{
if (threads.empty())
return;
auto queue_time = std::chrono::steady_clock::now();
const std::chrono::milliseconds main_loop_drift = drift.getDrift();
if (main_loop_drift > settings.maxEventLoopDrift)
{
Logger::getInstance()->log(LOG_WARNING) << "Main loop thread drift is " << main_loop_drift.count() << " ms.";
}
if (this->medianThreadDrift > settings.maxEventLoopDrift)
{
Logger::getInstance()->log(LOG_WARNING) << "Median thread drift is " << this->medianThreadDrift.count() << " ms.";
}
drift.update(queue_time);
std::vector<std::chrono::milliseconds> drifts(threads.size());
std::transform(threads.begin(), threads.end(), drifts.begin(), [] (const ThreadDataOwner &t) {
return t->driftCounter.getDrift();
});
const size_t n = drifts.size() / 2;
std::nth_element(drifts.begin(), drifts.begin() + n, drifts.end());
this->medianThreadDrift = drifts.at(n);
for (ThreadDataOwner &thread : threads)
{
thread->queueInternalHeartbeat();
}
}
/**
* @brief MainApp::saveState saves sessions and such to files. It's run in the main thread, but also dedicated threads. For that,
* reason, it's a static method to reduce the risk of accidental use of data without locks.
* @param settings A local settings, copied from a std::bind copy when running in a thread, because of thread safety.
* @param bridgeInfos is a list of objects already prepared from the original bridge configs, to avoid concurrent access.
*/
void MainApp::saveState(const Settings &settings, const std::list<BridgeInfoForSerializing> &bridgeInfos, bool in_background)
{
Logger *logger = Logger::getInstance();
try
{
if (!settings.storageDir.empty())
{
std::shared_ptr<SubscriptionStore> subscriptionStore = MainApp::getMainApp()->getSubscriptionStore();
const std::string retainedDBPath = settings.getRetainedMessagesDBFile();
if (settings.retainedMessagesMode == RetainedMessagesMode::Enabled)
subscriptionStore->saveRetainedMessages(retainedDBPath, in_background);
else
logger->logf(LOG_INFO, "Not saving '%s', because 'retained_messages_mode' is not 'enabled'.", retainedDBPath.c_str());
const std::string sessionsDBPath = settings.getSessionsDBFile();
subscriptionStore->saveSessionsAndSubscriptions(sessionsDBPath);
MainApp::saveBridgeInfo(settings.getBridgeNamesDBFile(), bridgeInfos);
logger->logf(LOG_NOTICE, "Saving states done");
}
}
catch(std::exception &ex)
{
logger->logf(LOG_ERR, "Error saving state: %s", ex.what());
}
}
void MainApp::saveBridgeInfo(const std::string &filePath, const std::list<BridgeInfoForSerializing> &bridgeInfos)
{
Logger *logger = Logger::getInstance();
logger->logf(LOG_NOTICE, "Saving bridge info in '%s'", filePath.c_str());
BridgeInfoDb bridgeInfoDb(filePath);
bridgeInfoDb.openWrite();
bridgeInfoDb.saveInfo(bridgeInfos);
}
std::list<std::shared_ptr<BridgeConfig>> MainApp::loadBridgeInfo(Settings &settings)
{
Logger *logger = Logger::getInstance();
std::list<std::shared_ptr<BridgeConfig>> bridges = settings.stealBridges();
if (settings.storageDir.empty())
return bridges;
const std::string filePath = settings.getBridgeNamesDBFile();
try
{
logger->logf(LOG_NOTICE, "Loading '%s'", filePath.c_str());
BridgeInfoDb dbfile(filePath);
dbfile.openRead();
std::list<BridgeInfoForSerializing> bridgeInfos = dbfile.readInfo();
for(const BridgeInfoForSerializing &info : bridgeInfos)
{
for(std::shared_ptr<BridgeConfig> &bridgeConfig : bridges)
{
if (!bridgeConfig->useSavedClientId)
continue;
if (bridgeConfig->clientidPrefix == info.prefix)
{
logger->log(LOG_INFO) << "Assigning stored bridge clientid '" << info.clientId << "' to bridge '" << info.prefix << "'.";
bridgeConfig->setClientId(info.prefix, info.clientId);
break;
}
}
}
}
catch (PersistenceFileCantBeOpened &ex)
{
logger->logf(LOG_WARNING, "File '%s' is not there (yet)", filePath.c_str());
}
return bridges;
}
void MainApp::initMainApp(int argc, char *argv[])
{
if (instance != nullptr)
throw std::runtime_error("App was already initialized.");
static struct option long_options[] =
{
{"help", no_argument, nullptr, 'h'},
{"config-file", required_argument, nullptr, 'c'},
{"test-config", no_argument, nullptr, 't'},
{"fuzz-file", required_argument, nullptr, 'z'},
{"version", no_argument, nullptr, 'V'},
{"license", no_argument, nullptr, 'l'},
{nullptr, 0, nullptr, 0}
};
#ifdef TESTING
const std::string defaultConfigFile = "/dummy/flashmq.org";
#else
const std::string defaultConfigFile = "/etc/flashmq/flashmq.conf";
#endif
std::string configFile;
if (access(defaultConfigFile.c_str(), R_OK) == 0)
{
configFile = defaultConfigFile;
}
std::string fuzzFile;
int option_index = 0;
int opt;
bool testConfig = false;
optind = 1; // allow repeated calls to getopt_long.
while((opt = getopt_long(argc, argv, "hc:Vltz:", long_options, &option_index)) != -1)
{
switch(opt)
{
case 'c':
configFile = optarg;
break;
case 'l':
MainApp::showLicense();
exit(0);
case 'V':
MainApp::showLicense();
exit(0);
case 'z':
fuzzFile = optarg;
break;
case 'h':
MainApp::doHelp(argv[0]);
exit(16);
case 't':
testConfig = true;
break;
case '?':
MainApp::doHelp(argv[0]);
exit(16);
}
}
if (optind < argc)
{
throw std::runtime_error("Error: positional arguments given. Did you mean --config-file <path>?");
}
if (testConfig)
{
try
{
if (configFile.empty())
{
std::cerr << "No config specified (with -c) and the default " << defaultConfigFile << " not found." << std::endl << std::endl;
MainApp::doHelp(argv[0]);
exit(1);
}
ConfigFileParser c(configFile);
c.loadFile(true);
printf("Config '%s' OK\n", configFile.c_str());
exit(0);
}
catch (ConfigFileException &ex)
{
std::cerr << ex.what() << std::endl;
exit(1);
}
}
instance = new MainApp(configFile);
instance->setFuzzFile(fuzzFile);
}
MainApp *MainApp::getMainApp()
{
if (!instance)
throw std::runtime_error("You haven't initialized the app yet.");
return instance;
}
void MainApp::start()
{
#ifndef NDEBUG
#ifndef TESTING
if (!getFuzzMode())
{
oneInstanceLock.lock();
}
#endif
#endif
#ifdef NDEBUG
logger->noLongerLogToStd();
#endif
struct epoll_event ev;
memset(&ev, 0, sizeof (struct epoll_event));
ev.data.fd = taskEventFd;
ev.events = EPOLLIN;
check<std::runtime_error>(epoll_ctl(this->epollFdAccept, EPOLL_CTL_ADD, taskEventFd, &ev));
#ifndef NDEBUG
// I fuzzed using afl-fuzz. You need to compile it with their compiler.
if (getFuzzMode())
{
// No threads for execution stability/determinism.
num_threads = 0;
settings.allowAnonymous = true;
int fd = open(fuzzFilePath.c_str(), O_RDONLY);
assert(fd > 0);
int fdnull = open("/dev/null", O_RDWR);
assert(fdnull > 0);
int fdnull2 = open("/dev/null", O_RDWR);
assert(fdnull2 > 0);
// TODO: matching for filename patterns doesn't work, because AFL fuzz changes the name.
const std::string fuzzFilePathLower = str_tolower(fuzzFilePath);
bool fuzzWebsockets = strContains(fuzzFilePathLower, "web");
try
{
const std::string empty;
std::vector<MqttPacket> packetQueueIn;
std::vector<std::string> subtopics;
std::shared_ptr<PluginLoader> pluginLoader = std::make_shared<PluginLoader>();
std::shared_ptr<ThreadData> threaddata = std::make_shared<ThreadData>(0, settings, pluginLoader);
ThreadGlobals::assignThreadData(threaddata);
std::shared_ptr<Client> client = std::make_shared<Client>(fd, threaddata, nullptr, fuzzWebsockets, false, nullptr, settings, true);
std::shared_ptr<Client> subscriber = std::make_shared<Client>(fdnull, threaddata, nullptr, fuzzWebsockets, false, nullptr, settings, true);
subscriber->setClientProperties(ProtocolVersion::Mqtt311, "subscriber", "subuser", true, 60);
subscriber->setAuthenticated(true);
std::shared_ptr<Client> websocketsubscriber = std::make_shared<Client>(fdnull2, threaddata, nullptr, true, false, nullptr, settings, true);
websocketsubscriber->setClientProperties(ProtocolVersion::Mqtt311, "websocketsubscriber", "websocksubuser", true, 60);
websocketsubscriber->setAuthenticated(true);
websocketsubscriber->setFakeUpgraded();
subscriptionStore->registerClientAndKickExistingOne(websocketsubscriber);
subtopics = splitTopic("#");
subscriptionStore->addSubscription(websocketsubscriber->getSession(), subtopics, 0, false, false, empty, 0);
subscriptionStore->registerClientAndKickExistingOne(subscriber);
subscriptionStore->addSubscription(subscriber->getSession(), subtopics, 0, false, false, empty, 0);
if (fuzzWebsockets && strContains(fuzzFilePathLower, "upgrade"))
{
client->setFakeUpgraded();
subscriber->setFakeUpgraded();
}
{
VectorClearGuard vectorClearGuard(packetQueueIn);
client->readFdIntoBuffer();
client->bufferToMqttPackets(packetQueueIn, client);
for (MqttPacket &packet : packetQueueIn)
{
packet.handle(client);
}
subscriber->writeBufIntoFd();
websocketsubscriber->writeBufIntoFd();
}
}
catch (ProtocolError &ex)
{
logger->logf(LOG_ERR, "Expected MqttPacket handling error: %s", ex.what());
}
running = false;
}
#endif
GlobalStats *globalStats = GlobalStats::getInstance();
std::shared_ptr<PluginLoader> pluginLoader = std::make_shared<PluginLoader>();
pluginLoader->loadPlugin(settings.pluginPath);
std::unordered_map<std::string, std::string> &authOpts = settings.getFlashmqpluginOpts();
pluginLoader->mainInit(authOpts);
for (int i = 0; i < num_threads; i++)
{
threads.emplace_back(i, settings, pluginLoader);
threads.back().start();
}
// Populate the $SYS topics, otherwise you have to wait until the timer expires.
if (!threads.empty())
{
std::vector<std::shared_ptr<ThreadData>> thread_datas;
for(ThreadDataOwner &t : threads)
{
thread_datas.push_back(t.getThreadData());
}
threads.front()->queuePublishStatsOnDollarTopic(thread_datas);
}
sendBridgesToThreads();
queueBridgeReconnectAllThreads(true);
this->bgWorker.start();
struct epoll_event events[MAX_EVENTS];
memset(&events, 0, sizeof (struct epoll_event)*MAX_EVENTS);
started = true;
while (running)
{
const uint32_t next_task_delay = timed_tasks.getTimeTillNext();
const uint32_t epoll_wait_time = std::min<uint32_t>(next_task_delay, 100);
int num_fds = epoll_wait(this->epollFdAccept, events, MAX_EVENTS, epoll_wait_time);
if (epoll_wait_time == 0)
timed_tasks.performAll();
if (num_fds < 0)
{
if (errno == EINTR)
continue;
logger->logf(LOG_ERR, "Waiting for listening socket error: %s", strerror(errno));
}
for (int i = 0; i < num_fds; i++)
{
int cur_fd = events[i].data.fd;
try
{
if (cur_fd != taskEventFd)
{
std::shared_ptr<Listener> listener = activeListenSockets[cur_fd].getListener();
if (!listener)
continue;
std::shared_ptr<ThreadData> thread_data = threads[listener->next_thread_index++ % num_threads].getThreadData();
logger->logf(LOG_DEBUG, "Accepting connection on thread %d on %s", thread_data->threadnr, listener->getProtocolName().c_str());
struct sockaddr_in6 addrBiggest;
struct sockaddr *addr = reinterpret_cast<sockaddr*>(&addrBiggest);
socklen_t len = sizeof(struct sockaddr_in6);
memset(addr, 0, len);
int fd = check<std::runtime_error>(accept(cur_fd, addr, &len));
/*
* I decided to not use a delayed close mechanism. It has been observed that under overload and clients in a reconnect loop,
* you can collect open files up to (a) million(s). By accepting and closing, the hope is we can keep clients at bay from
* the thread loops well enough.
*/
if (this->medianThreadDrift > settings.maxEventLoopDrift || this->drift.getDrift() > settings.maxEventLoopDrift)
{
const std::string addr_s = sockaddrToString(addr);
bool do_close = false;
const OverloadMode overload_mode = listener->overloadMode.value_or(settings.overloadMode);
if (overload_mode == OverloadMode::CloseNewClients)
{
if (overloadLogCounter <= OVERLOAD_LOGS_MUTE_AFTER_LINES)
{
overloadLogCounter++;
logger->log(LOG_ERROR) << "[OVERLOAD] FlashMQ seems to be overloaded while accepting new connection(s) from '"
<< addr_s << ". Closing socket. See 'overload_mode' and 'max_event_loop_drift'.";
}
do_close = true;
}
else if (overload_mode == OverloadMode::Log)
{
if (overloadLogCounter <= OVERLOAD_LOGS_MUTE_AFTER_LINES)
{
overloadLogCounter++;
logger->log(LOG_WARNING) << "[OVERLOAD] FlashMQ seems to be overloaded while accepting new connection(s) from '"
<< addr_s << ". See 'overload_mode' and 'max_event_loop_drift'.";
}
}
else
{
throw std::runtime_error("Unimplemented OverloadMode");
}
if (overloadLogCounter > OVERLOAD_LOGS_MUTE_AFTER_LINES && overloadLogCounter < OVERLOAD_LOGS_MUTE_AFTER_LINES * 2)
{
overloadLogCounter = OVERLOAD_LOGS_MUTE_AFTER_LINES * 5;
logger->log(LOG_WARNING) << "[OVERLOAD] Muting overload logging until it recovers, to avoid log spam and extra load.";
}
if (do_close)
{
close(fd);
continue;
}
}
else
{
overloadLogCounter = 0;
}
SSL *clientSSL = nullptr;
if (listener->isSsl())
{
if (!listener->sslctx)
{
logger->log(LOG_ERR) << "Listener is SSL but SSL context is null. Application bug.";
close(fd);
continue;
}
clientSSL = SSL_new(listener->sslctx->get());
if (clientSSL == NULL)
{
logger->logf(LOG_ERR, "Problem creating SSL object. Closing client.");
close(fd);
continue;
}
SSL_set_fd(clientSSL, fd);
}
// Don't use std::make_shared to avoid the weak pointers keeping the control block in memory.
std::shared_ptr<Client> client = std::shared_ptr<Client>(new Client(fd, thread_data, clientSSL, listener->websocket, listener->isHaProxy(), addr, settings));
if (listener->getX509ClientVerficationMode() != X509ClientVerification::None)
{
client->setSslVerify(listener->getX509ClientVerficationMode());
}
client->setAllowAnonymousOverride(listener->allowAnonymous);
thread_data->giveClient(std::move(client));
globalStats->socketConnects.inc();
}
else
{
uint64_t eventfd_value = 0;
check<std::runtime_error>(read(cur_fd, &eventfd_value, sizeof(uint64_t)));
if (doConfigReload)
{
reloadConfig();
}
if (doLogFileReOpen)
{
reopenLogfile();
}
if (doQuitAction)
{
quit();
}
if (doMemoryTrim)
{
memoryTrim();
}
}
}
catch (std::exception &ex)
{
logger->logf(LOG_ERR, "Problem in main thread: %s", ex.what());
}
}
}
activeListenSockets.clear();
this->bgWorker.stop();
if (settings.willsEnabled)
{
logger->logf(LOG_DEBUG, "Having all client in all threads send or queue their will.");
for(ThreadDataOwner &thread : threads)
{
thread->queueSendWills();
}
waitForWillsQueued();
}
logger->logf(LOG_DEBUG, "Having all client in all threads send a disconnect packet and initiate quit.");
for(ThreadDataOwner &thread : threads)
{
thread->queueSendDisconnects();
}
oneInstanceLock.unlock();
{
logger->logf(LOG_DEBUG, "Waiting for our own quit event to have been queued.");
int count = 0;
while(std::any_of(threads.begin(), threads.end(), [](const ThreadDataOwner &t){ return t->running; }))
{
if (count++ >= 30000)
break;
usleep(1000);
}
}
logger->logf(LOG_DEBUG, "Waiting for threads clean-up functions to finish.");
int count = 0;
bool waitTimeExpired = false;
while(std::any_of(threads.begin(), threads.end(), [](ThreadDataOwner &t){ return !t->finished; }))
{
if (count++ >= 30000)
{
waitTimeExpired = true;
break;
}
usleep(1000);
}
if (waitTimeExpired)
{
logger->logf(LOG_WARNING, "(Some) threads failed to terminate. Program will exit uncleanly. If you're using a plugin, it may not be thread-safe.");
}
else
{
for(ThreadDataOwner &thread : threads)
{
logger->logf(LOG_DEBUG, "Waiting for thread %d to join.", thread->threadnr);
thread.waitForQuit();
}
}
pluginLoader->mainDeinit(settings.getFlashmqpluginOpts());
Globals::getInstance().quitting = true;
this->bgWorker.waitForStop();
std::list<BridgeInfoForSerializing> bridgeInfos = BridgeInfoForSerializing::getBridgeInfosForSerializing(this->bridgeConfigs);
saveState(this->settings, bridgeInfos, false);
}
void MainApp::queueQuit()
{
this->doQuitAction = true;
wakeUpThread();
}
void MainApp::quit()
{
doQuitAction = false;
std::lock_guard<std::mutex> guard(quitMutex);
if (!running)
return;
Logger *logger = Logger::getInstance();
logger->logf(LOG_NOTICE, "Quitting FlashMQ");
running = false;
}
bool MainApp::getFuzzMode() const
{
bool fuzzMode = false;
#ifndef NDEBUG
fuzzMode = !fuzzFilePath.empty();
#endif
return fuzzMode;
}
void MainApp::setlimits()
{
rlim_t nofile = settings.rlimitNoFile;
logger->log(LOG_INFO) << "Setting rlimit nofile to " << nofile;
struct rlimit v = { nofile, nofile };
if (setrlimit(RLIMIT_NOFILE, &v) < 0)
{
logger->logf(LOG_ERR, "Setting ulimit nofile failed: '%s'. This means the default is used. Note. It's also subject to systemd's 'LimitNOFILE', "
"which in turn is maxed to '/proc/sys/fs/nr_open', which can be set like 'sysctl fs.nr_open=15000000'", strerror(errno));
}
}
/**
* @brief MainApp::loadConfig is loaded on app start where you want it to crash, loaded from within try/catch on reload, to allow the program to continue.
*/
void MainApp::loadConfig(bool reload)
{
Logger *logger = Logger::getInstance();
logger->log(LOG_NOTICE) << std::boolalpha << "Loading config. Reload: " << reload << ".";
// Atomic loading, first test.
confFileParser->loadFile(true);
confFileParser->loadFile(false);
const Settings oldSettings = settings;
settings = confFileParser->getSettings();
ThreadGlobals::assignSettings(&settings);
if (settings.listeners.empty())
{
std::shared_ptr<Listener> defaultListener = std::make_shared<Listener>();
// Kind of a quick hack to do this this way.
#ifdef TESTING
defaultListener->port = 21883;
#endif
defaultListener->isValid();
settings.listeners.push_back(defaultListener);
}
listeners = settings.listeners;
for (std::shared_ptr<Listener> &listener : this->listeners)
{
listener->isValid();
}