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// (C) 2013-2014 Cybozu.
#include "constants.hpp"
#include "memcache/handler.hpp"
#include "counter/handler.hpp"
#include "server.hpp"
#include "global.hpp"
#include <cybozu/logger.hpp>
#include <cybozu/signal.hpp>
#include <cybozu/tcp.hpp>
#include <algorithm>
#include <cstdlib>
#include <signal.h>
#include <thread>
namespace yrmcds {
server::server(): m_syncer(m_workers) {
auto finder = [this]() ->cybozu::worker* {
std::size_t n_workers = m_workers.size();
for( std::size_t i = 0; i < n_workers; ++i ) {
cybozu::worker* pw = m_workers[m_worker_index].get();
m_worker_index = (m_worker_index + 1) % n_workers;
if( ! pw->is_running() )
return pw;
}
return nullptr;
};
m_handlers.emplace_back(new memcache::handler(finder, m_reactor, m_syncer));
if( g_config.counter().enable() )
m_handlers.emplace_back(new counter::handler(finder, m_reactor));
}
inline bool server::reactor_gc_ready() {
if( ! m_reactor.has_garbage() ) return false;
if( ! m_syncer.empty() ) return false;
auto ready = [](const std::unique_ptr<protocol_handler>& p) {
return p->reactor_gc_ready();
};
return std::all_of(m_handlers.cbegin(), m_handlers.cend(), ready);
}
void server::serve() {
auto res = cybozu::signal_setup({SIGHUP, SIGQUIT, SIGTERM, SIGINT, SIGUSR1});
res->set_handler([this](const struct signalfd_siginfo& si,
cybozu::reactor& r) {
switch(si.ssi_signo) {
case SIGUSR1:
for( auto& handler: m_handlers )
handler->dump_stats();
break;
case SIGHUP:
cybozu::logger::instance().reopen();
cybozu::logger::info() << "got SIGHUP.";
break;
case SIGQUIT:
case SIGTERM:
case SIGINT:
m_signaled = true;
r.quit();
break;
}
});
m_reactor.add_resource(std::move(res), cybozu::reactor::EVENT_IN);
for( auto& handler: m_handlers )
handler->on_start();
if( is_master() )
goto MASTER_ENTRY;
while( true ) {
for( auto& handler: m_handlers )
handler->clear();
serve_slave();
if( m_signaled ) return;
// disconnected from the master
for( int i = 0; i < MASTER_CHECKS; ++i ) {
if( is_master() )
goto MASTER_ENTRY;
std::this_thread::sleep_for( std::chrono::milliseconds(100) );
}
}
MASTER_ENTRY:
serve_master();
std::quick_exit(0);
}
void server::serve_slave() {
for( auto it1 = m_handlers.begin(); it1 != m_handlers.end(); ++it1 ) {
if( ! (*it1)->on_slave_start() ) {
// failed to start. stop already started handlers.
for( auto it2 = m_handlers.begin(); it2 != it1; ++it2 )
(*it2)->on_slave_end();
return;
}
}
cybozu::logger::info() << "Slave start";
m_reactor.run([this](cybozu::reactor& r) {
if( is_master() ) {
r.quit();
return;
}
std::time_t now = std::time(nullptr);
g_current_time.store(now, std::memory_order_relaxed);
for( auto& handler: m_handlers )
handler->on_slave_interval();
r.fix_garbage();
r.gc();
});
for( auto& handler: m_handlers )
handler->on_slave_end();
cybozu::logger::info() << "Slave end";
}
void server::serve_master() {
cybozu::logger::info() << "Entering master mode";
for( auto& handler: m_handlers )
handler->on_master_start();
auto callback = [this](cybozu::reactor&) {
std::time_t now = std::time(nullptr);
g_current_time.store(now, std::memory_order_relaxed);
if( ! m_syncer.empty() )
m_syncer.check();
for( auto& handler: m_handlers )
handler->on_master_interval();
if( reactor_gc_ready() ) {
m_reactor.fix_garbage();
m_syncer.add_request(
std::unique_ptr<sync_request>(
new sync_request([this]{ m_reactor.gc(); })
));
}
};
for( unsigned int i = 0; i < g_config.workers(); ++i )
m_workers.emplace_back(new cybozu::worker(WORKER_BUFSIZE));
for( auto& w: m_workers )
w->start();
auto stop = [this] {
m_reactor.invalidate();
for( auto& w: m_workers )
w->stop();
for( auto& handler: m_handlers )
handler->on_master_end();
};
try {
cybozu::logger::info() << "Reactor thread id="
<< std::this_thread::get_id();
m_reactor.run(callback);
cybozu::logger::info() << "Exiting";
} catch( ... ) {
stop();
throw;
}
stop();
}
} // namespace yrmcds
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