nghttp2/examples/shrpx_client_handler.cc

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/*
* Spdylay - SPDY Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* 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.
*/
#include "shrpx_client_handler.h"
#include <cerrno>
#include "shrpx_upstream.h"
#include "shrpx_spdy_upstream.h"
#include "shrpx_https_upstream.h"
#include "shrpx_config.h"
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#include "shrpx_downstream_connection.h"
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#include "shrpx_accesslog.h"
namespace shrpx {
namespace {
void upstream_readcb(bufferevent *bev, void *arg)
{
ClientHandler *handler = reinterpret_cast<ClientHandler*>(arg);
int rv = handler->on_read();
if(rv != 0) {
LOG(WARNING) << "<upstream> Read operation (application level) failure";
delete handler;
}
}
} // namespace
namespace {
void upstream_writecb(bufferevent *bev, void *arg)
{
ClientHandler *handler = reinterpret_cast<ClientHandler*>(arg);
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// We actually depend on write low-warter mark == 0.
if(handler->get_should_close_after_write()) {
delete handler;
} else {
Upstream *upstream = handler->get_upstream();
int rv = upstream->on_write();
if(rv != 0) {
LOG(WARNING) << "<upstream> Write operation (application level) failure";
delete handler;
}
}
}
} // namespace
namespace {
void upstream_eventcb(bufferevent *bev, short events, void *arg)
{
ClientHandler *handler = reinterpret_cast<ClientHandler*>(arg);
bool finish = false;
if(events & BEV_EVENT_EOF) {
if(ENABLE_LOG) {
LOG(INFO) << "Upstream EOF";
}
finish = true;
}
if(events & BEV_EVENT_ERROR) {
if(ENABLE_LOG) {
LOG(INFO) << "Upstream network error: "
<< evutil_socket_error_to_string(EVUTIL_SOCKET_ERROR());
}
finish = true;
}
if(events & BEV_EVENT_TIMEOUT) {
if(ENABLE_LOG) {
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LOG(INFO) << "Upstream time out";
}
finish = true;
}
if(finish) {
delete handler;
} else {
if(events & BEV_EVENT_CONNECTED) {
if(ENABLE_LOG) {
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LOG(INFO) << "Upstream connected. handler " << handler;
}
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if(get_config()->accesslog) {
upstream_connect(handler->get_ipaddr());
}
handler->set_bev_cb(upstream_readcb, upstream_writecb, upstream_eventcb);
handler->validate_next_proto();
if(ENABLE_LOG) {
if(SSL_session_reused(handler->get_ssl())) {
LOG(INFO) << "SSL/TLS session reused";
}
}
// At this point, input buffer is already filled with some
// bytes. The read callback is not called until new data
// come. So consume input buffer here.
handler->get_upstream()->on_read();
}
}
}
} // namespace
ClientHandler::ClientHandler(bufferevent *bev, SSL *ssl, const char *ipaddr)
: bev_(bev),
ssl_(ssl),
upstream_(0),
ipaddr_(ipaddr),
should_close_after_write_(false)
{
bufferevent_enable(bev_, EV_READ | EV_WRITE);
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bufferevent_setwatermark(bev_, EV_READ, 0, SHRPX_READ_WARTER_MARK);
set_upstream_timeouts(&get_config()->upstream_read_timeout,
&get_config()->upstream_write_timeout);
set_bev_cb(0, upstream_writecb, upstream_eventcb);
}
ClientHandler::~ClientHandler()
{
if(ENABLE_LOG) {
LOG(INFO) << "Deleting ClientHandler " << this;
}
int fd = SSL_get_fd(ssl_);
SSL_shutdown(ssl_);
bufferevent_disable(bev_, EV_READ | EV_WRITE);
bufferevent_free(bev_);
SSL_free(ssl_);
shutdown(fd, SHUT_WR);
close(fd);
delete upstream_;
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for(std::set<DownstreamConnection*>::iterator i = dconn_pool_.begin();
i != dconn_pool_.end(); ++i) {
delete *i;
}
if(ENABLE_LOG) {
LOG(INFO) << "Deleted";
}
}
Upstream* ClientHandler::get_upstream()
{
return upstream_;
}
bufferevent* ClientHandler::get_bev() const
{
return bev_;
}
event_base* ClientHandler::get_evbase() const
{
return bufferevent_get_base(bev_);
}
void ClientHandler::set_bev_cb
(bufferevent_data_cb readcb, bufferevent_data_cb writecb,
bufferevent_event_cb eventcb)
{
bufferevent_setcb(bev_, readcb, writecb, eventcb, this);
}
void ClientHandler::set_upstream_timeouts(const timeval *read_timeout,
const timeval *write_timeout)
{
bufferevent_set_timeouts(bev_, read_timeout, write_timeout);
}
int ClientHandler::validate_next_proto()
{
const unsigned char *next_proto = 0;
unsigned int next_proto_len;
SSL_get0_next_proto_negotiated(ssl_, &next_proto, &next_proto_len);
if(next_proto) {
std::string proto(next_proto, next_proto+next_proto_len);
if(ENABLE_LOG) {
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LOG(INFO) << "Upstream negotiated next protocol: " << proto;
}
uint16_t version = spdylay_npn_get_version(next_proto, next_proto_len);
if(version) {
SpdyUpstream *spdy_upstream = new SpdyUpstream(version, this);
upstream_ = spdy_upstream;
return 0;
}
} else {
if(ENABLE_LOG) {
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LOG(INFO) << "No proto negotiated.";
}
}
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if(ENABLE_LOG) {
LOG(INFO) << "Use HTTP/1.1";
}
HttpsUpstream *https_upstream = new HttpsUpstream(this);
upstream_ = https_upstream;
return 0;
}
int ClientHandler::on_read()
{
return upstream_->on_read();
}
int ClientHandler::on_event()
{
return upstream_->on_event();
}
const std::string& ClientHandler::get_ipaddr() const
{
return ipaddr_;
}
bool ClientHandler::get_should_close_after_write() const
{
return should_close_after_write_;
}
void ClientHandler::set_should_close_after_write(bool f)
{
should_close_after_write_ = f;
}
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void ClientHandler::pool_downstream_connection(DownstreamConnection *dconn)
{
if(ENABLE_LOG) {
LOG(INFO) << "Pooling downstream connection " << dconn;
}
dconn_pool_.insert(dconn);
}
void ClientHandler::remove_downstream_connection(DownstreamConnection *dconn)
{
if(ENABLE_LOG) {
LOG(INFO) << "Removing downstream connection " << dconn
<< " from pool";
}
dconn_pool_.erase(dconn);
}
DownstreamConnection* ClientHandler::get_downstream_connection()
{
if(dconn_pool_.empty()) {
if(ENABLE_LOG) {
LOG(INFO) << "Downstream connection pool is empty. Create new one";
}
return new DownstreamConnection(this);
} else {
DownstreamConnection *dconn = *dconn_pool_.begin();
dconn_pool_.erase(dconn);
if(ENABLE_LOG) {
LOG(INFO) << "Reuse downstream connection " << dconn
<< " from pool";
}
return dconn;
}
}
size_t ClientHandler::get_pending_write_length()
{
evbuffer *output = bufferevent_get_output(bev_);
return evbuffer_get_length(output);
}
SSL* ClientHandler::get_ssl() const
{
return ssl_;
}
} // namespace shrpx