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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2014-2017 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _PASSENGER_SERVER_KIT_FD_SOURCE_CHANNEL_H_
#define _PASSENGER_SERVER_KIT_FD_SOURCE_CHANNEL_H_
#include <oxt/macros.hpp>
#include <boost/move/move.hpp>
#include <sys/types.h>
#include <unistd.h>
#include <ev.h>
#include <jsoncpp/json.h>
#include <MemoryKit/mbuf.h>
#include <ServerKit/Context.h>
#include <ServerKit/Channel.h>
namespace Passenger {
namespace ServerKit {
using namespace oxt;
class FdSourceChannel: protected Channel {
private:
ev_io watcher;
MemoryKit::mbuf buffer;
static void _onReadable(EV_P_ ev_io *io, int revents) {
static_cast<FdSourceChannel *>(io->data)->onReadable(io, revents);
}
void onReadable(ev_io *io, int revents) {
RefGuard guard(hooks, this, __FILE__, __LINE__);
onReadableWithoutRefGuard();
}
void onReadableWithoutRefGuard() {
unsigned int generation = this->generation;
unsigned int i, origBufferSize;
bool done = false;
ssize_t ret;
int e;
if (!acceptingInput()) {
ev_io_stop(ctx->libev->getLoop(), &watcher);
if (mayAcceptInputLater()) {
consumedCallback = onChannelConsumed;
}
return;
}
for (i = 0; i < burstReadCount && !done; i++) {
if (buffer.empty()) {
buffer = MemoryKit::mbuf_get(&ctx->mbuf_pool);
}
origBufferSize = buffer.size();
do {
ret = ::read(watcher.fd, buffer.start, buffer.size());
} while (OXT_UNLIKELY(ret == -1 && errno == EINTR));
if (ret > 0) {
MemoryKit::mbuf buffer2(buffer, 0, ret);
if (size_t(ret) == size_t(buffer.size())) {
// Unref mbuf_block
buffer = MemoryKit::mbuf();
} else {
buffer = MemoryKit::mbuf(buffer, ret);
}
feedWithoutRefGuard(boost::move(buffer2));
if (generation != this->generation) {
// Callback deinitialized this object.
return;
}
if (!acceptingInput()) {
done = true;
ev_io_stop(ctx->libev->getLoop(), &watcher);
if (mayAcceptInputLater()) {
consumedCallback = onChannelConsumed;
}
} else {
// If we were unable to fill the entire buffer, then it's likely that
// the client is slow and that the next read() will fail with
// EAGAIN, so we stop looping and return to the event loop poller.
done = (size_t) ret < origBufferSize;
}
} else if (ret == 0) {
done = true;
ev_io_stop(ctx->libev->getLoop(), &watcher);
buffer = MemoryKit::mbuf();
feedWithoutRefGuard(MemoryKit::mbuf());
} else {
e = errno;
done = true;
buffer = MemoryKit::mbuf();
if (e != EAGAIN && e != EWOULDBLOCK) {
ev_io_stop(ctx->libev->getLoop(), &watcher);
feedError(e);
}
}
}
}
static void onChannelConsumed(Channel *channel, unsigned int size) {
FdSourceChannel *self = static_cast<FdSourceChannel *>(channel);
self->consumedCallback = NULL;
if (self->acceptingInput()) {
ev_io_start(self->ctx->libev->getLoop(), &self->watcher);
}
}
void initialize() {
burstReadCount = 1;
watcher.active = false;
watcher.fd = -1;
watcher.data = this;
}
public:
unsigned int burstReadCount;
FdSourceChannel() {
initialize();
}
FdSourceChannel(Context *context)
: Channel(context)
{
initialize();
}
~FdSourceChannel() {
if (ctx != NULL && ev_is_active(&watcher)) {
ev_io_stop(ctx->libev->getLoop(), &watcher);
}
}
// May only be called right after construction.
OXT_FORCE_INLINE
void setContext(Context *context) {
Channel::setContext(context);
}
void reinitialize(int fd) {
Channel::reinitialize();
ev_io_init(&watcher, _onReadable, fd, EV_READ);
}
void deinitialize() {
buffer = MemoryKit::mbuf();
if (ev_is_active(&watcher)) {
ev_io_stop(ctx->libev->getLoop(), &watcher);
}
watcher.fd = -1;
consumedCallback = NULL;
Channel::deinitialize();
}
// May only be called right after the constructor or reinitialize().
void startReading() {
startReadingInNextTick();
onReadableWithoutRefGuard();
}
// May only be called right after the constructor or reinitialize().
void startReadingInNextTick() {
assert(Channel::acceptingInput());
ev_io_start(ctx->libev->getLoop(), &watcher);
}
OXT_FORCE_INLINE
void start() {
Channel::start();
}
OXT_FORCE_INLINE
void stop() {
Channel::stop();
}
OXT_FORCE_INLINE
void consumed(unsigned int size, bool end) {
Channel::consumed(size, end);
}
OXT_FORCE_INLINE
int getFd() const {
return watcher.fd;
}
OXT_FORCE_INLINE
State getState() const {
return Channel::getState();
}
OXT_FORCE_INLINE
bool isStarted() const {
return Channel::isStarted();
}
OXT_FORCE_INLINE
void setDataCallback(DataCallback callback) {
Channel::dataCallback = callback;
}
OXT_FORCE_INLINE
Hooks *getHooks() const {
return hooks;
}
OXT_FORCE_INLINE
void setHooks(Hooks *hooks) {
this->hooks = hooks;
}
Json::Value inspectAsJson() const {
Json::Value doc = Channel::inspectAsJson();
doc["initialized"] = watcher.fd != -1;
doc["io_watcher_active"] = (bool) watcher.active;
return doc;
}
};
} // namespace ServerKit
} // namespace Passenger
#endif /* _PASSENGER_SERVER_KIT_FD_SOURCE_CHANNEL_H_ */
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