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+/* <!-- copyright */
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+/*
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+ * aria2 - The high speed download utility
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+ *
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+ * Copyright (C) 2010 Tatsuhiro Tsujikawa
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+ * Copyright (C) 2013 Tatsuhiro Tsujikawa, Nils Maier
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (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
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+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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+ *
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+ * In addition, as a special exception, the copyright holders give
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+ * permission to link the code of portions of this program with the
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+ * OpenSSL library under certain conditions as described in each
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+ * individual source file, and distribute linked combinations
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+ * including the two.
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+ * You must obey the GNU General Public License in all respects
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+ * for all of the code used other than OpenSSL. If you modify
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+ * file(s) with this exception, you may extend this exception to your
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+ * version of the file(s), but you are not obligated to do so. If you
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+ * do not wish to do so, delete this exception statement from your
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+ * version. If you delete this exception statement from all source
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+ * files in the program, then also delete it here.
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+ */
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+/* copyright --> */
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+
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+#ifdef __MINGW32__
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+#ifdef _WIN32_WINNT
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+#undef _WIN32_WINNT
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+#endif // _WIN32_WINNT
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+#define _WIN32_WINNT 0x0600
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+#endif // __MINGW32__
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+
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+#include "LibuvEventPoll.h"
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+
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+#include <algorithm>
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+#include <cstring>
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+#include <numeric>
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+#include <stdexcept>
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+
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+#include <uv.h>
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+
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+#include "Command.h"
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+#include "LogFactory.h"
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+#include "Logger.h"
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+#include "a2functional.h"
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+#include "fmt.h"
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+#include "util.h"
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+
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+namespace {
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+ using namespace aria2;
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+
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+ template<typename T>
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+ static void close_callback(uv_handle_t* handle)
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+ {
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+ delete reinterpret_cast<T*>(handle);
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+ }
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+
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+ static void timer_callback(uv_timer_t* handle, int status)
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+ {
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+ uv_stop(handle->loop);
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+ }
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+}
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+
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+namespace aria2 {
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+
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+LibuvEventPoll::KSocketEntry::KSocketEntry(sock_t s)
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+ : SocketEntry<KCommandEvent, KADNSEvent>(s)
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+{}
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+
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+inline int accumulateEvent(int events, const LibuvEventPoll::KEvent& event)
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+{
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+ return events | event.getEvents();
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+}
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+
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+int LibuvEventPoll::KSocketEntry::getEvents() const
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+{
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+ int events = 0;
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+#ifdef ENABLE_ASYNC_DNS
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+ events = std::accumulate(adnsEvents_.begin(), adnsEvents_.end(),
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+ std::accumulate(commandEvents_.begin(),
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+ commandEvents_.end(), 0,
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+ accumulateEvent),
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+ accumulateEvent);
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+#else // !ENABLE_ASYNC_DNS
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+ events = std::accumulate(commandEvents_.begin(), commandEvents_.end(), 0,
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+ accumulateEvent);
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+#endif // !ENABLE_ASYNC_DNS
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+
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+ return events;
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+}
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+
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+LibuvEventPoll::LibuvEventPoll()
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+{
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+ loop_ = uv_loop_new();
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+}
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+
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+LibuvEventPoll::~LibuvEventPoll()
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+{
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+ for (KPolls::iterator i = polls_.begin(), e = polls_.end(); i != e; ++i) {
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+ i->second->close();
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+ }
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+ // Actually kill the polls, and timers, if any.
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+ uv_run(loop_, (uv_run_mode)(UV_RUN_ONCE | UV_RUN_NOWAIT));
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+
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+ if (loop_) {
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+ uv_loop_delete(loop_);
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+ loop_ = 0;
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+ }
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+
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+ // Need this to free only after the loop is gone.
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+ polls_.clear();
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+}
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+
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+void LibuvEventPoll::poll(const struct timeval& tv)
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+{
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+ const int timeout = tv.tv_sec * 1000 + tv.tv_usec / 1000;
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+
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+ // timeout == 0 will tick once
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+ if (timeout >= 0) {
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+ uv_timer_t* timer = new uv_timer_t;
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+ uv_timer_init(loop_, timer);
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+ uv_timer_start(timer, timer_callback, timeout, timeout);
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+
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+ uv_run(loop_, UV_RUN_DEFAULT);
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+
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+ // Remove timer again.
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+ uv_timer_stop(timer);
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+ uv_close((uv_handle_t*)timer, close_callback<uv_timer_t>);
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+ }
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+ else {
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+ while (uv_run(loop_, (uv_run_mode)(UV_RUN_ONCE | UV_RUN_NOWAIT)) > 0) {}
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+ }
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+
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+#ifdef ENABLE_ASYNC_DNS
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+ // It turns out that we have to call ares_process_fd before ares's
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+ // own timeout and ares may create new sockets or closes socket in
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+ // their API. So we call ares_process_fd for all ares_channel and
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+ // re-register their sockets.
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+ for(KAsyncNameResolverEntrySet::iterator i = nameResolverEntries_.begin(),
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+ eoi = nameResolverEntries_.end(); i != eoi; ++i) {
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+ (*i)->processTimeout();
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+ (*i)->removeSocketEvents(this);
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+ (*i)->addSocketEvents(this);
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+ }
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+#endif // ENABLE_ASYNC_DNS
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+
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+ // TODO timeout of name resolver is determined in Command(AbstractCommand,
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+ // DHTEntryPoint...Command)
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+}
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+
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+int LibuvEventPoll::translateEvents(EventPoll::EventType events)
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+{
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+ int newEvents = 0;
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+ if (EventPoll::EVENT_READ & events) {
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+ newEvents |= IEV_READ;
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+ }
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+ if (EventPoll::EVENT_WRITE & events) {
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+ newEvents |= IEV_WRITE;
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+ }
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+ if (EventPoll::EVENT_ERROR & events) {
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+ newEvents |= IEV_ERROR;
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+ }
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+ if (EventPoll::EVENT_HUP & events) {
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+ newEvents |= IEV_HUP;
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+ }
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+ return newEvents;
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+}
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+
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+void LibuvEventPoll::pollCallback(KPoll* poll, int status, int events)
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+{
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+ if (status == -1) {
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+ uv_err_t err = uv_last_error(loop_);
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+ switch (err.code) {
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+ case UV_EAGAIN:
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+ case UV_EINTR:
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+ return;
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+ case UV_EOF:
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+ case UV_ECONNABORTED:
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+ case UV_ECONNREFUSED:
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+ case UV_ECONNRESET:
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+ case UV_ENOTCONN:
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+ case UV_EPIPE:
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+ case UV_ESHUTDOWN:
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+ events = IEV_HUP;
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+ poll->processEvents(events);
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+ poll->stop();
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+ uv_stop(loop_);
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+ return;
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+ default:
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+ events = IEV_ERROR;
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+ poll->processEvents(events);
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+ poll->stop();
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+ uv_stop(loop_);
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+ return;
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+ }
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+ }
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+
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+ // Got something
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+ poll->processEvents(events);
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+ uv_stop(loop_);
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+}
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+
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+bool LibuvEventPoll::addEvents(sock_t socket,
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+ const LibuvEventPoll::KEvent& event)
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+{
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+ SharedHandle<KSocketEntry> socketEntry(new KSocketEntry(socket));
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+ KSocketEntrySet::iterator i = socketEntries_.lower_bound(socketEntry);
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+
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+ if (i != socketEntries_.end() && **i == *socketEntry) {
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+ event.addSelf(*i);
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+ KPolls::iterator poll = polls_.find(socket);
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+ if (poll == polls_.end()) {
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+ throw std::logic_error("Invalid socket");
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+ }
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+ poll->second->start();
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+ return true;
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+ }
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+
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+ socketEntries_.insert(i, socketEntry);
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+ event.addSelf(socketEntry);
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+ KPoll* poll = new KPoll(this, socketEntry.get(), socket);
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+ polls_[socket] = poll;
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+ poll->start();
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+ return true;
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+}
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+
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+bool LibuvEventPoll::addEvents(sock_t socket, Command* command, EventPoll::EventType events)
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+{
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+ int pollEvents = translateEvents(events);
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+ return addEvents(socket, KCommandEvent(command, pollEvents));
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+}
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+
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+#ifdef ENABLE_ASYNC_DNS
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+bool LibuvEventPoll::addEvents(sock_t socket, Command* command, int events,
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+ const SharedHandle<AsyncNameResolver>& rs)
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+{
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+ return addEvents(socket, KADNSEvent(rs, command, socket, events));
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+}
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+#endif // ENABLE_ASYNC_DNS
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+
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+bool LibuvEventPoll::deleteEvents(sock_t socket,
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+ const LibuvEventPoll::KEvent& event)
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+{
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+ SharedHandle<KSocketEntry> socketEntry(new KSocketEntry(socket));
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+ KSocketEntrySet::iterator i = socketEntries_.find(socketEntry);
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+
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+ if (i == socketEntries_.end()) {
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+ A2_LOG_DEBUG(fmt("Socket %d is not found in SocketEntries.", socket));
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+ return false;
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+ }
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+
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+ event.removeSelf(*i);
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+
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+ KPolls::iterator poll = polls_.find(socket);
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+ if (poll == polls_.end()) {
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+ return false;
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+ }
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+
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+ if ((*i)->eventEmpty()) {
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+ poll->second->close();
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+ polls_.erase(poll);
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+ socketEntries_.erase(i);
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+ return true;
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+ }
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+
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+ poll->second->start();
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+ return true;
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+}
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+
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+#ifdef ENABLE_ASYNC_DNS
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+bool LibuvEventPoll::deleteEvents(sock_t socket, Command* command,
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+ const SharedHandle<AsyncNameResolver>& rs)
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+{
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+ return deleteEvents(socket, KADNSEvent(rs, command, socket, 0));
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+}
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+#endif // ENABLE_ASYNC_DNS
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+
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+bool LibuvEventPoll::deleteEvents(sock_t socket, Command* command,
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+ EventPoll::EventType events)
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+{
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+ int pollEvents = translateEvents(events);
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+ return deleteEvents(socket, KCommandEvent(command, pollEvents));
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+}
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+
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+#ifdef ENABLE_ASYNC_DNS
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+bool LibuvEventPoll::addNameResolver(const SharedHandle<AsyncNameResolver>& resolver,
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+ Command* command)
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+{
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+ SharedHandle<KAsyncNameResolverEntry> entry(
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+ new KAsyncNameResolverEntry(resolver, command));
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+ KAsyncNameResolverEntrySet::iterator itr =
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+ nameResolverEntries_.lower_bound(entry);
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+ if (itr != nameResolverEntries_.end() && *(*itr) == *entry) {
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+ return false;
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+ }
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+ nameResolverEntries_.insert(itr, entry);
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+ entry->addSocketEvents(this);
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+ return true;
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+}
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+
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+bool LibuvEventPoll::deleteNameResolver(const SharedHandle<AsyncNameResolver>& resolver,
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+ Command* command)
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+{
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+ SharedHandle<KAsyncNameResolverEntry> entry(
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+ new KAsyncNameResolverEntry(resolver, command));
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+ KAsyncNameResolverEntrySet::iterator itr = nameResolverEntries_.find(entry);
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+ if (itr == nameResolverEntries_.end()) {
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+ return false;
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+ }
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+ (*itr)->removeSocketEvents(this);
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+ nameResolverEntries_.erase(itr);
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+ return true;
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+}
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+#endif // ENABLE_ASYNC_DNS
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+
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+} // namespace aria2
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Tatsuhiro Tsujikawa