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spdylay/examples/shrpx_spdy_upstream.cc
Tatsuhiro Tsujikawa be1c6bb968 Removed commented send()
2012-06-05 21:25:05 +09:00

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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_spdy_upstream.h"
#include <assert.h>
#include <sstream>
#include "shrpx_client_handler.h"
#include "shrpx_downstream.h"
#include "shrpx_config.h"
#include "shrpx_http.h"
#include "util.h"
using namespace spdylay;
namespace shrpx {
namespace {
const size_t SHRPX_SPDY_UPSTREAM_OUTPUT_UPPER_THRES = 512*1024;
} // namespace
namespace {
ssize_t send_callback(spdylay_session *session,
const uint8_t *data, size_t len, int flags,
void *user_data)
{
int rv;
SpdyUpstream *upstream = reinterpret_cast<SpdyUpstream*>(user_data);
ClientHandler *handler = upstream->get_client_handler();
bufferevent *bev = handler->get_bev();
evbuffer *output = bufferevent_get_output(bev);
// Check buffer length and return WOULDBLOCK if it is large enough.
if(evbuffer_get_length(output) > SHRPX_SPDY_UPSTREAM_OUTPUT_UPPER_THRES) {
return SPDYLAY_ERR_WOULDBLOCK;
}
rv = evbuffer_add(output, data, len);
if(rv == -1) {
return SPDYLAY_ERR_CALLBACK_FAILURE;
} else {
return len;
}
}
} // namespace
namespace {
ssize_t recv_callback(spdylay_session *session,
uint8_t *data, size_t len, int flags, void *user_data)
{
SpdyUpstream *upstream = reinterpret_cast<SpdyUpstream*>(user_data);
ClientHandler *handler = upstream->get_client_handler();
bufferevent *bev = handler->get_bev();
evbuffer *input = bufferevent_get_input(bev);
int nread = evbuffer_remove(input, data, len);
if(nread == -1) {
return SPDYLAY_ERR_CALLBACK_FAILURE;
} else if(nread == 0) {
return SPDYLAY_ERR_WOULDBLOCK;
} else {
return nread;
}
}
} // namespace
namespace {
void on_stream_close_callback
(spdylay_session *session, int32_t stream_id, spdylay_status_code status_code,
void *user_data)
{
if(ENABLE_LOG) {
LOG(INFO) << "<upstream>::<spdy> Stream " << stream_id
<< " is being closed";
}
SpdyUpstream *upstream = reinterpret_cast<SpdyUpstream*>(user_data);
Downstream *downstream = upstream->get_downstream_queue()->find(stream_id);
if(downstream) {
downstream->set_request_state(Downstream::STREAM_CLOSED);
if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
upstream->get_downstream_queue()->remove(downstream);
delete downstream;
}
}
}
} // namespace
namespace {
void on_ctrl_recv_callback
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data)
{
SpdyUpstream *upstream = reinterpret_cast<SpdyUpstream*>(user_data);
switch(type) {
case SPDYLAY_SYN_STREAM: {
if(ENABLE_LOG) {
LOG(INFO) << "<upstream>::<spdy> Received upstream SYN_STREAM stream_id="
<< frame->syn_stream.stream_id;
}
Downstream *downstream = new Downstream(upstream,
frame->syn_stream.stream_id,
frame->syn_stream.pri);
downstream->init_response_body_buf();
char **nv = frame->syn_stream.nv;
for(size_t i = 0; nv[i]; i += 2) {
if(strcmp(nv[i], ":path") == 0) {
downstream->set_request_path(nv[i+1]);
} else if(strcmp(nv[i], ":method") == 0) {
downstream->set_request_method(nv[i+1]);
} else if(nv[i][0] != ':') {
downstream->add_request_header(nv[i], nv[i+1]);
}
}
downstream->add_request_header("X-Forwarded-Spdy", "true");
if(ENABLE_LOG) {
std::stringstream ss;
for(size_t i = 0; nv[i]; i += 2) {
ss << nv[i] << ": " << nv[i+1] << "\n";
}
LOG(INFO) << "<upstream>::<spdy> Request headers:\n" << ss.str();
}
downstream->push_request_headers();
downstream->set_request_state(Downstream::HEADER_COMPLETE);
if(frame->syn_stream.hd.flags & SPDYLAY_CTRL_FLAG_FIN) {
if(ENABLE_LOG) {
LOG(INFO) << "<upstream>::<spdy> "
<< "Setting Downstream::MSG_COMPLETE for Downstream "
<< downstream;
}
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
upstream->add_downstream(downstream);
upstream->start_downstream(downstream);
break;
}
default:
break;
}
}
} // namespace
namespace {
void on_data_chunk_recv_callback(spdylay_session *session,
uint8_t flags, int32_t stream_id,
const uint8_t *data, size_t len,
void *user_data)
{
if(ENABLE_LOG) {
LOG(INFO) << "<upstream>::<spdy> Received upstream DATA data stream_id="
<< stream_id;
}
SpdyUpstream *upstream = reinterpret_cast<SpdyUpstream*>(user_data);
Downstream *downstream = upstream->get_downstream_queue()->find(stream_id);
if(downstream) {
downstream->push_upload_data_chunk(data, len);
if(flags & SPDYLAY_DATA_FLAG_FIN) {
if(ENABLE_LOG) {
LOG(INFO) << "<upstream>::<spdy> "
<< "Setting Downstream::MSG_COMPLETE for Downstream "
<< downstream;
}
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
}
}
} // namespace
SpdyUpstream::SpdyUpstream(uint16_t version, ClientHandler *handler)
: handler_(handler),
session_(0)
{
//handler->set_bev_cb(spdy_readcb, 0, spdy_eventcb);
handler->set_upstream_timeouts(&get_config()->spdy_upstream_read_timeout,
&get_config()->spdy_upstream_write_timeout);
spdylay_session_callbacks callbacks;
memset(&callbacks, 0, sizeof(callbacks));
callbacks.send_callback = send_callback;
callbacks.recv_callback = recv_callback;
callbacks.on_stream_close_callback = on_stream_close_callback;
callbacks.on_ctrl_recv_callback = on_ctrl_recv_callback;
callbacks.on_data_chunk_recv_callback = on_data_chunk_recv_callback;
int rv;
rv = spdylay_session_server_new(&session_, version, &callbacks, this);
assert(rv == 0);
// TODO Maybe call from outside?
spdylay_settings_entry entry;
entry.settings_id = SPDYLAY_SETTINGS_MAX_CONCURRENT_STREAMS;
entry.value = SPDYLAY_INITIAL_MAX_CONCURRENT_STREAMS;
entry.flags = SPDYLAY_ID_FLAG_SETTINGS_NONE;
rv = spdylay_submit_settings(session_, SPDYLAY_FLAG_SETTINGS_NONE,
&entry, 1);
assert(rv == 0);
// TODO Maybe call from outside?
send();
}
SpdyUpstream::~SpdyUpstream()
{
spdylay_session_del(session_);
}
int SpdyUpstream::on_read()
{
int rv;
if((rv = spdylay_session_recv(session_)) ||
(rv = spdylay_session_send(session_))) {
if(rv != SPDYLAY_ERR_EOF) {
LOG(ERROR) << "spdylay error: " << spdylay_strerror(rv);
DIE();
}
}
return 0;
}
int SpdyUpstream::on_write()
{
send();
return 0;
}
int SpdyUpstream::send()
{
int rv;
if((rv = spdylay_session_send(session_))) {
LOG(ERROR) << "spdylay error: " << spdylay_strerror(rv);
DIE();
}
return 0;
}
int SpdyUpstream::on_event()
{
return 0;
}
ClientHandler* SpdyUpstream::get_client_handler() const
{
return handler_;
}
namespace {
void spdy_downstream_readcb(bufferevent *bev, void *ptr)
{
if(ENABLE_LOG) {
LOG(INFO) << "spdy_downstream_readcb";
}
Downstream *downstream = reinterpret_cast<Downstream*>(ptr);
SpdyUpstream *upstream;
upstream = static_cast<SpdyUpstream*>(downstream->get_upstream());
int rv = downstream->parse_http_response();
if(rv == 0) {
if(downstream->get_request_state() == Downstream::STREAM_CLOSED &&
downstream->get_response_state() == Downstream::MSG_COMPLETE) {
upstream->get_downstream_queue()->remove(downstream);
delete downstream;
} else {
upstream->send();
}
} else {
if(ENABLE_LOG) {
LOG(INFO) << "<downstream> http parser failure";
}
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
} else {
upstream->error_reply(downstream, 502);
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
upstream->send();
// upstream->remove_downstream(downstream);
// delete downstream;
}
}
} // namespace
namespace {
void spdy_downstream_writecb(bufferevent *bev, void *ptr)
{
}
} // namespace
namespace {
void spdy_downstream_eventcb(bufferevent *bev, short events, void *ptr)
{
Downstream *downstream = reinterpret_cast<Downstream*>(ptr);
SpdyUpstream *upstream;
upstream = static_cast<SpdyUpstream*>(downstream->get_upstream());
if(events & BEV_EVENT_CONNECTED) {
if(ENABLE_LOG) {
LOG(INFO) << "<downstream> Connection established. Downstream "
<< downstream;
}
}
if(events & BEV_EVENT_EOF) {
if(ENABLE_LOG) {
LOG(INFO) << "<downstream> EOF stream_id="
<< downstream->get_stream_id();
}
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
//If stream was closed already, we don't need to send reply at
// the first place. We can delete downstream.
upstream->remove_downstream(downstream);
delete downstream;
} else {
// downstream wil be deleted in on_stream_close_callback.
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
// Server may indicate the end of the request by EOF
if(ENABLE_LOG) {
LOG(INFO) << "<downstream> Assuming content-length is 0 byte";
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
upstream->on_downstream_body_complete(downstream);
} else if(downstream->get_response_state() != Downstream::MSG_COMPLETE) {
// If stream was not closed, then we set MSG_COMPLETE and let
// on_stream_close_callback delete downstream.
upstream->error_reply(downstream, 502);
downstream->set_response_state(Downstream::MSG_COMPLETE);
upstream->send();
}
}
} else if(events & (BEV_EVENT_ERROR | BEV_EVENT_TIMEOUT)) {
if(ENABLE_LOG) {
LOG(INFO) << "<downstream> error/timeout. Downstream " << downstream;
}
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
upstream->remove_downstream(downstream);
delete downstream;
} else {
if(downstream->get_response_state() != Downstream::MSG_COMPLETE) {
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
} else {
int status;
if(events & BEV_EVENT_TIMEOUT) {
status = 504;
} else {
status = 502;
}
upstream->error_reply(downstream, status);
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
upstream->send();
}
}
}
}
} // namespace
int SpdyUpstream::rst_stream(Downstream *downstream, int status_code)
{
int rv;
rv = spdylay_submit_rst_stream(session_, downstream->get_stream_id(),
status_code);
if(rv < SPDYLAY_ERR_FATAL) {
DIE();
} else {
return 0;
}
}
namespace {
ssize_t spdy_data_read_callback(spdylay_session *session,
int32_t stream_id,
uint8_t *buf, size_t length,
int *eof,
spdylay_data_source *source,
void *user_data)
{
Downstream *downstream = reinterpret_cast<Downstream*>(source->ptr);
evbuffer *body = downstream->get_response_body_buf();
assert(body);
int nread = evbuffer_remove(body, buf, length);
if(nread == 0 &&
downstream->get_response_state() == Downstream::MSG_COMPLETE) {
*eof = 1;
}
if(nread == 0 && *eof != 1) {
return SPDYLAY_ERR_DEFERRED;
}
return nread;
}
} // namespace
int SpdyUpstream::error_reply(Downstream *downstream, int status_code)
{
int rv;
std::string html = http::create_error_html(status_code);
downstream->init_response_body_buf();
evbuffer *body = downstream->get_response_body_buf();
rv = evbuffer_add(body, html.c_str(), html.size());
if(rv == -1) {
DIE();
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
spdylay_data_provider data_prd;
data_prd.source.ptr = downstream;
data_prd.read_callback = spdy_data_read_callback;
const char *nv[] = {
":status", http::get_status_string(status_code),
":version", "http/1.1",
"content-type", "text/html; charset=UTF-8",
"server", get_config()->server_name,
0
};
rv = spdylay_submit_response(session_, downstream->get_stream_id(), nv,
&data_prd);
if(rv < SPDYLAY_ERR_FATAL) {
DIE();
} else {
return 0;
}
}
bufferevent_data_cb SpdyUpstream::get_downstream_readcb()
{
return spdy_downstream_readcb;
}
bufferevent_data_cb SpdyUpstream::get_downstream_writecb()
{
return spdy_downstream_writecb;
}
bufferevent_event_cb SpdyUpstream::get_downstream_eventcb()
{
return spdy_downstream_eventcb;
}
void SpdyUpstream::add_downstream(Downstream *downstream)
{
downstream_queue_.add(downstream);
}
void SpdyUpstream::start_downstream(Downstream *downstream)
{
downstream_queue_.start(downstream);
}
void SpdyUpstream::remove_downstream(Downstream *downstream)
{
downstream_queue_.remove(downstream);
}
spdylay_session* SpdyUpstream::get_spdy_session()
{
return session_;
}
int SpdyUpstream::on_downstream_header_complete(Downstream *downstream)
{
if(ENABLE_LOG) {
LOG(INFO) << "<downstream> on_downstream_header_complete";
}
size_t nheader = downstream->get_response_headers().size();
const char **nv = new const char*[nheader * 2 + 4 + 1];
size_t hdidx = 0;
for(Headers::const_iterator i = downstream->get_response_headers().begin();
i != downstream->get_response_headers().end(); ++i) {
if(util::strieq((*i).first.c_str(), "transfer-encoding") ||
util::strieq((*i).first.c_str(), "keep-alive") || // HTTP/1.0?
util::strieq((*i).first.c_str(), "connection") ||
util:: strieq((*i).first.c_str(), "proxy-connection")) {
// These are ignored
} else if(util::strieq((*i).first.c_str(), "server")) {
nv[hdidx++] = "server";
nv[hdidx++] = get_config()->server_name;
} else {
nv[hdidx++] = (*i).first.c_str();
nv[hdidx++] = (*i).second.c_str();
}
}
nv[hdidx++] = ":status";
nv[hdidx++] = http::get_status_string(downstream->get_response_http_status());
nv[hdidx++] = ":version";
nv[hdidx++] = "HTTP/1.1";
nv[hdidx++] = 0;
if(ENABLE_LOG) {
std::stringstream ss;
for(size_t i = 0; nv[i]; i += 2) {
ss << nv[i] << ": " << nv[i+1] << "\n";
}
LOG(INFO) << "<upstream>::<spdy> Response headers\n" << ss.str();
}
spdylay_data_provider data_prd;
data_prd.source.ptr = downstream;
data_prd.read_callback = spdy_data_read_callback;
spdylay_submit_response(session_, downstream->get_stream_id(), nv,
&data_prd);
delete [] nv;
return 0;
}
int SpdyUpstream::on_downstream_body(Downstream *downstream,
const uint8_t *data, size_t len)
{
if(ENABLE_LOG) {
LOG(INFO) << "<downstream> on_downstream_body";
}
evbuffer *body = downstream->get_response_body_buf();
evbuffer_add(body, data, len);
spdylay_session_resume_data(session_, downstream->get_stream_id());
size_t bodylen = evbuffer_get_length(body);
if(bodylen > SHRPX_SPDY_UPSTREAM_OUTPUT_UPPER_THRES) {
downstream->pause_read(SHRPX_NO_BUFFER);
}
return 0;
}
int SpdyUpstream::on_downstream_body_complete(Downstream *downstream)
{
if(ENABLE_LOG) {
LOG(INFO) << "<downstream> on_downstream_body_complete";
}
spdylay_session_resume_data(session_, downstream->get_stream_id());
return 0;
}
DownstreamQueue* SpdyUpstream::get_downstream_queue()
{
return &downstream_queue_;
}
} // namespace shrpx
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