mirror of https://github.com/Icinga/icinga2.git
416 lines
10 KiB
C++
416 lines
10 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2016 Icinga Development Team (https://www.icinga.org/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#include "base/socketevents.hpp"
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#include "base/exception.hpp"
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#include "base/logger.hpp"
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#include <boost/thread/once.hpp>
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#include <boost/foreach.hpp>
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#include <map>
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#ifdef __linux__
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# include <sys/epoll.h>
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#endif /* __linux__ */
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using namespace icinga;
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struct SocketEventDescriptor
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{
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#ifndef __linux__
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int Events;
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#endif /* __linux__ */
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SocketEvents *EventInterface;
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Object *LifesupportObject;
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SocketEventDescriptor(void)
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:
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#ifndef __linux__
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Events(POLLIN),
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#endif /* __linux__ */
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EventInterface(NULL), LifesupportObject(NULL)
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{ }
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};
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struct EventDescription
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{
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int REvents;
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SocketEventDescriptor Descriptor;
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Object::Ptr LifesupportReference;
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};
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#define SOCKET_IOTHREADS 8
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static boost::once_flag l_SocketIOOnceFlag = BOOST_ONCE_INIT;
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static boost::thread l_SocketIOThreads[SOCKET_IOTHREADS];
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#ifdef __linux__
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static SOCKET l_SocketIOPollFDs[SOCKET_IOTHREADS];
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#endif /* __linux__ */
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static SOCKET l_SocketIOEventFDs[SOCKET_IOTHREADS][2];
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static bool l_SocketIOFDChanged[SOCKET_IOTHREADS];
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static boost::mutex l_SocketIOMutex[SOCKET_IOTHREADS];
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static boost::condition_variable l_SocketIOCV[SOCKET_IOTHREADS];
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static std::map<SOCKET, SocketEventDescriptor> l_SocketIOSockets[SOCKET_IOTHREADS];
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int SocketEvents::m_NextID = 0;
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void SocketEvents::InitializeThread(void)
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{
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for (int i = 0; i < SOCKET_IOTHREADS; i++) {
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#ifdef __linux__
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l_SocketIOPollFDs[i] = epoll_create(128);
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Utility::SetCloExec(l_SocketIOPollFDs[i]);
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#endif /* __linux__ */
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Socket::SocketPair(l_SocketIOEventFDs[i]);
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Utility::SetNonBlockingSocket(l_SocketIOEventFDs[i][0]);
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Utility::SetNonBlockingSocket(l_SocketIOEventFDs[i][1]);
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#ifndef _WIN32
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Utility::SetCloExec(l_SocketIOEventFDs[i][0]);
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Utility::SetCloExec(l_SocketIOEventFDs[i][1]);
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#endif /* _WIN32 */
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SocketEventDescriptor sed;
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#ifndef __linux__
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sed.Events = POLLIN;
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#endif /* __linux__ */
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l_SocketIOSockets[i][l_SocketIOEventFDs[i][0]] = sed;
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l_SocketIOFDChanged[i] = true;
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#ifdef __linux__
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epoll_event event;
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memset(&event, 0, sizeof(event));
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event.data.fd = l_SocketIOEventFDs[i][0];
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event.events = EPOLLIN;
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epoll_ctl(l_SocketIOPollFDs[i], EPOLL_CTL_ADD, l_SocketIOEventFDs[i][0], &event);
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#endif /* __linux__ */
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l_SocketIOThreads[i] = boost::thread(&SocketEvents::ThreadProc, i);
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}
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}
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#ifdef __linux__
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int SocketEvents::PollToEpoll(int events)
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{
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int result = 0;
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if (events & POLLIN)
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result |= EPOLLIN;
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if (events & POLLOUT)
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result |= EPOLLOUT;
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return events;
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}
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int SocketEvents::EpollToPoll(int events)
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{
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int result = 0;
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if (events & EPOLLIN)
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result |= POLLIN;
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if (events & EPOLLOUT)
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result |= POLLOUT;
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return events;
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}
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#endif /* __linux__ */
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void SocketEvents::ThreadProc(int tid)
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{
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Utility::SetThreadName("SocketIO");
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#ifndef __linux__
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std::vector<pollfd> pfds;
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std::vector<SocketEventDescriptor> descriptors;
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#endif /* __linux__ */
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for (;;) {
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{
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boost::mutex::scoped_lock lock(l_SocketIOMutex[tid]);
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if (l_SocketIOFDChanged[tid]) {
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#ifndef __linux__
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pfds.resize(l_SocketIOSockets[tid].size());
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descriptors.resize(l_SocketIOSockets[tid].size());
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int i = 0;
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typedef std::map<SOCKET, SocketEventDescriptor>::value_type kv_pair;
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BOOST_FOREACH(const kv_pair& desc, l_SocketIOSockets[tid]) {
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if (desc.second.EventInterface)
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desc.second.EventInterface->m_PFD = &pfds[i];
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pfds[i].fd = desc.first;
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pfds[i].events = desc.second.Events;
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descriptors[i] = desc.second;
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i++;
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}
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#endif /* __linux__ */
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l_SocketIOFDChanged[tid] = false;
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l_SocketIOCV[tid].notify_all();
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}
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}
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#ifndef __linux__
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ASSERT(!pfds.empty());
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#endif /* __linux__ */
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#ifdef __linux__
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epoll_event pevents[64];
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int ready = epoll_wait(l_SocketIOPollFDs[tid], pevents, sizeof(pevents) / sizeof(pevents[0]), -1);
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#elif _WIN32
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(void) WSAPoll(&pfds[0], pfds.size(), -1);
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#else /* _WIN32 */
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(void) poll(&pfds[0], pfds.size(), -1);
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#endif /* _WIN32 */
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std::vector<EventDescription> events;
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{
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boost::mutex::scoped_lock lock(l_SocketIOMutex[tid]);
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if (l_SocketIOFDChanged[tid]) {
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#ifdef __linux__
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l_SocketIOFDChanged[tid] = false;
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#endif /* __linux__ */
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continue;
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}
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#ifdef __linux__
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for (int i = 0; i < ready; i++) {
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if (pevents[i].data.fd == l_SocketIOEventFDs[tid][0]) {
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char buffer[512];
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if (recv(l_SocketIOEventFDs[tid][0], buffer, sizeof(buffer), 0) < 0)
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Log(LogCritical, "SocketEvents", "Read from event FD failed.");
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continue;
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}
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if ((pevents[i].events & (EPOLLIN | EPOLLOUT | EPOLLHUP | EPOLLERR)) == 0)
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continue;
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EventDescription event;
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event.REvents = EpollToPoll(pevents[i].events);
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event.Descriptor = l_SocketIOSockets[tid][pevents[i].data.fd];
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event.LifesupportReference = event.Descriptor.LifesupportObject;
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VERIFY(event.LifesupportReference);
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events.push_back(event);
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}
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#else /* __linux__ */
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for (int i = 0; i < pfds.size(); i++) {
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if ((pfds[i].revents & (POLLIN | POLLOUT | POLLHUP | POLLERR)) == 0)
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continue;
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if (pfds[i].fd == l_SocketIOEventFDs[tid][0]) {
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char buffer[512];
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if (recv(l_SocketIOEventFDs[tid][0], buffer, sizeof(buffer), 0) < 0)
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Log(LogCritical, "SocketEvents", "Read from event FD failed.");
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continue;
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}
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EventDescription event;
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event.REvents = pfds[i].revents;
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event.Descriptor = descriptors[i];
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event.LifesupportReference = event.Descriptor.LifesupportObject;
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VERIFY(event.LifesupportReference);
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events.push_back(event);
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}
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#endif /* __linux__ */
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}
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BOOST_FOREACH(const EventDescription& event, events) {
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try {
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event.Descriptor.EventInterface->OnEvent(event.REvents);
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} catch (const std::exception& ex) {
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Log(LogCritical, "SocketEvents")
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<< "Exception thrown in socket I/O handler:\n"
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<< DiagnosticInformation(ex);
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} catch (...) {
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Log(LogCritical, "SocketEvents", "Exception of unknown type thrown in socket I/O handler.");
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}
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}
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}
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}
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void SocketEvents::WakeUpThread(bool wait)
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{
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int tid = m_ID % SOCKET_IOTHREADS;
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if (boost::this_thread::get_id() == l_SocketIOThreads[tid].get_id())
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return;
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if (wait) {
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boost::mutex::scoped_lock lock(l_SocketIOMutex[tid]);
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l_SocketIOFDChanged[tid] = true;
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while (l_SocketIOFDChanged[tid]) {
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(void) send(l_SocketIOEventFDs[tid][1], "T", 1, 0);
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boost::system_time const timeout = boost::get_system_time() + boost::posix_time::milliseconds(50);
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l_SocketIOCV[tid].timed_wait(lock, timeout);
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}
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} else {
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(void) send(l_SocketIOEventFDs[tid][1], "T", 1, 0);
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}
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}
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/**
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* Constructor for the SocketEvents class.
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*/
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SocketEvents::SocketEvents(const Socket::Ptr& socket, Object *lifesupportObject)
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: m_ID(m_NextID++), m_FD(socket->GetFD())
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#ifndef __linux__
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, m_PFD(NULL)
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#endif /* __linux__ */
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{
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boost::call_once(l_SocketIOOnceFlag, &SocketEvents::InitializeThread);
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Register(lifesupportObject);
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}
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SocketEvents::~SocketEvents(void)
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{
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VERIFY(m_FD == INVALID_SOCKET);
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}
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void SocketEvents::Register(Object *lifesupportObject)
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{
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int tid = m_ID % SOCKET_IOTHREADS;
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{
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boost::mutex::scoped_lock lock(l_SocketIOMutex[tid]);
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VERIFY(m_FD != INVALID_SOCKET);
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SocketEventDescriptor desc;
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#ifndef __linux__
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desc.Events = 0;
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#endif /* __linux__ */
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desc.EventInterface = this;
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desc.LifesupportObject = lifesupportObject;
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VERIFY(l_SocketIOSockets[tid].find(m_FD) == l_SocketIOSockets[tid].end());
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l_SocketIOSockets[tid][m_FD] = desc;
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#ifdef __linux__
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epoll_event event;
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memset(&event, 0, sizeof(event));
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event.data.fd = m_FD;
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event.events = 0;
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epoll_ctl(l_SocketIOPollFDs[tid], EPOLL_CTL_ADD, m_FD, &event);
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#else /* __linux__ */
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l_SocketIOFDChanged[tid] = true;
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#endif /* __linux__ */
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m_Events = true;
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}
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#ifndef __linux__
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WakeUpThread(true);
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#endif /* __linux__ */
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}
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void SocketEvents::Unregister(void)
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{
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int tid = m_ID % SOCKET_IOTHREADS;
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{
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boost::mutex::scoped_lock lock(l_SocketIOMutex[tid]);
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if (m_FD == INVALID_SOCKET)
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return;
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l_SocketIOSockets[tid].erase(m_FD);
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l_SocketIOFDChanged[tid] = true;
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#ifdef __linux__
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epoll_ctl(l_SocketIOPollFDs[tid], EPOLL_CTL_DEL, m_FD, NULL);
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#endif /* __linux__ */
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m_FD = INVALID_SOCKET;
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m_Events = false;
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}
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WakeUpThread(true);
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}
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void SocketEvents::ChangeEvents(int events)
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{
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if (m_FD == INVALID_SOCKET)
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BOOST_THROW_EXCEPTION(std::runtime_error("Tried to read/write from a closed socket."));
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int tid = m_ID % SOCKET_IOTHREADS;
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{
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boost::mutex::scoped_lock lock(l_SocketIOMutex[tid]);
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std::map<SOCKET, SocketEventDescriptor>::iterator it = l_SocketIOSockets[tid].find(m_FD);
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if (it == l_SocketIOSockets[tid].end())
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return;
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#ifdef __linux__
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epoll_event event;
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memset(&event, 0, sizeof(event));
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event.data.fd = m_FD;
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event.events = PollToEpoll(events);
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epoll_ctl(l_SocketIOPollFDs[tid], EPOLL_CTL_MOD, m_FD, &event);
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#else /* __linux__ */
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if (it->second.Events == events)
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return;
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it->second.Events = events;
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if (m_PFD && boost::this_thread::get_id() == l_SocketIOThreads[tid].get_id())
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m_PFD->events = events;
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else
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l_SocketIOFDChanged[tid] = true;
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#endif /* __linux__ */
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}
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#ifndef __linux__
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WakeUpThread();
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#endif /* __linux__ */
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}
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bool SocketEvents::IsHandlingEvents(void) const
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{
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int tid = m_ID % SOCKET_IOTHREADS;
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boost::mutex::scoped_lock lock(l_SocketIOMutex[tid]);
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return m_Events;
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}
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void SocketEvents::OnEvent(int revents)
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{
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}
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