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nghttp2/src/shrpx_http2_upstream.cc

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/*
* nghttp2 - HTTP/2 C 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_http2_upstream.h"
#include <netinet/tcp.h>
#include <assert.h>
#include <cerrno>
#include <sstream>
#include "shrpx_client_handler.h"
#include "shrpx_https_upstream.h"
#include "shrpx_downstream.h"
#include "shrpx_downstream_connection.h"
#include "shrpx_config.h"
#include "shrpx_http.h"
#include "shrpx_worker_config.h"
#include "http2.h"
#include "util.h"
#include "base64.h"
#include "app_helper.h"
using namespace nghttp2;
namespace shrpx {
namespace {
const size_t OUTBUF_MAX_THRES = 16*1024;
const size_t INBUF_MAX_THRES = 16*1024;
} // namespace
namespace {
int on_stream_close_callback
(nghttp2_session *session, int32_t stream_id, uint32_t error_code,
void *user_data)
{
auto upstream = static_cast<Http2Upstream*>(user_data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Stream stream_id=" << stream_id
<< " is being closed";
}
auto downstream = upstream->find_downstream(stream_id);
if(!downstream) {
return 0;
}
upstream->consume(stream_id, downstream->get_request_datalen());
downstream->reset_request_datalen();
if(downstream->get_request_state() == Downstream::CONNECT_FAIL) {
upstream->remove_downstream(downstream);
// downstream was deleted
return 0;
}
downstream->set_request_state(Downstream::STREAM_CLOSED);
if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
// At this point, downstream response was read
if(!downstream->get_upgraded() &&
!downstream->get_response_connection_close()) {
// Keep-alive
downstream->detach_downstream_connection();
}
upstream->remove_downstream(downstream);
// downstream was deleted
return 0;
}
// At this point, downstream read may be paused.
// If shrpx_downstream::push_request_headers() failed, the
// error is handled here.
upstream->remove_downstream(downstream);
// downstream was deleted
// How to test this case? Request sufficient large download
// and make client send RST_STREAM after it gets first DATA
// frame chunk.
return 0;
}
} // namespace
int Http2Upstream::upgrade_upstream(HttpsUpstream *http)
{
int rv;
auto http2_settings = http->get_downstream()->get_http2_settings();
util::to_base64(http2_settings);
auto settings_payload = base64::decode(std::begin(http2_settings),
std::end(http2_settings));
rv = nghttp2_session_upgrade
(session_,
reinterpret_cast<const uint8_t*>(settings_payload.c_str()),
settings_payload.size(),
nullptr);
if(rv != 0) {
ULOG(WARN, this) << "nghttp2_session_upgrade() returned error: "
<< nghttp2_strerror(rv);
return -1;
}
pre_upstream_.reset(http);
auto downstream = http->pop_downstream();
downstream->reset_upstream(this);
downstream->set_stream_id(1);
downstream->init_upstream_timer();
downstream->reset_upstream_rtimer();
downstream->init_response_body_buf();
downstream->set_stream_id(1);
downstream->set_priority(0);
downstream_queue_.add_active(std::move(downstream));
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "Connection upgraded to HTTP/2";
}
return 0;
}
namespace {
void settings_timeout_cb(evutil_socket_t fd, short what, void *arg)
{
auto upstream = static_cast<Http2Upstream*>(arg);
ULOG(INFO, upstream) << "SETTINGS timeout";
if(upstream->terminate_session(NGHTTP2_SETTINGS_TIMEOUT) != 0) {
delete upstream->get_client_handler();
return;
}
if(upstream->send() != 0) {
delete upstream->get_client_handler();
}
}
} // namespace
int Http2Upstream::start_settings_timer()
{
int rv;
// We submit SETTINGS only once
if(settings_timerev_) {
return 0;
}
settings_timerev_ = evtimer_new(handler_->get_evbase(), settings_timeout_cb,
this);
if(settings_timerev_ == nullptr) {
return -1;
}
// SETTINGS ACK timeout is 10 seconds for now
timeval settings_timeout = { 10, 0 };
rv = evtimer_add(settings_timerev_, &settings_timeout);
if(rv == -1) {
return -1;
}
return 0;
}
void Http2Upstream::stop_settings_timer()
{
if(settings_timerev_ == nullptr) {
return;
}
event_free(settings_timerev_);
settings_timerev_ = nullptr;
}
namespace {
int on_header_callback(nghttp2_session *session,
const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
uint8_t flags,
void *user_data)
{
if(get_config()->upstream_frame_debug) {
verbose_on_header_callback(session, frame, name, namelen, value, valuelen,
flags, user_data);
}
if(frame->hd.type != NGHTTP2_HEADERS ||
frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
return 0;
}
auto upstream = static_cast<Http2Upstream*>(user_data);
auto downstream = upstream->find_downstream(frame->hd.stream_id);
if(!downstream) {
return 0;
}
if(downstream->get_request_headers_sum() > Downstream::MAX_HEADERS_SUM) {
if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
return 0;
}
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Too large header block size="
<< downstream->get_request_headers_sum();
}
if(upstream->error_reply(downstream, 431) != 0) {
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
return 0;
}
if(!http2::check_nv(name, namelen, value, valuelen)) {
// Simply discard name/value, as if it never happen.
return 0;
}
if(namelen > 0 && name[0] == ':') {
if(!downstream->request_pseudo_header_allowed() ||
!http2::check_http2_request_pseudo_header(name, namelen)) {
upstream->rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
}
downstream->split_add_request_header(name, namelen, value, valuelen,
flags & NGHTTP2_NV_FLAG_NO_INDEX);
return 0;
}
} // namespace
namespace {
int on_begin_headers_callback(nghttp2_session *session,
const nghttp2_frame *frame,
void *user_data)
{
auto upstream = static_cast<Http2Upstream*>(user_data);
if(frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
return 0;
}
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Received upstream request HEADERS stream_id="
<< frame->hd.stream_id;
}
// TODO Use priority 0 for now
auto downstream = util::make_unique<Downstream>
(upstream, frame->hd.stream_id, 0);
downstream->init_upstream_timer();
downstream->reset_upstream_rtimer();
downstream->init_response_body_buf();
// Although, we deprecated minor version from HTTP/2, we supply
// minor version 0 to use via header field in a conventional way.
downstream->set_request_major(2);
downstream->set_request_minor(0);
upstream->add_pending_downstream(std::move(downstream));
return 0;
}
} // namespace
namespace {
int on_request_headers(Http2Upstream *upstream,
Downstream *downstream,
nghttp2_session *session,
const nghttp2_frame *frame)
{
if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
return 0;
}
downstream->normalize_request_headers();
auto& nva = downstream->get_request_headers();
if(LOG_ENABLED(INFO)) {
std::stringstream ss;
for(auto& nv : nva) {
ss << TTY_HTTP_HD << nv.name << TTY_RST << ": " << nv.value << "\n";
}
ULOG(INFO, upstream) << "HTTP request headers. stream_id="
<< downstream->get_stream_id()
<< "\n" << ss.str();
}
if(get_config()->http2_upstream_dump_request_header) {
http2::dump_nv(get_config()->http2_upstream_dump_request_header, nva);
}
if(!http2::check_http2_request_headers(nva)) {
upstream->rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
return 0;
}
auto host = http2::get_unique_header(nva, "host");
auto authority = http2::get_unique_header(nva, ":authority");
auto path = http2::get_unique_header(nva, ":path");
auto method = http2::get_unique_header(nva, ":method");
auto scheme = http2::get_unique_header(nva, ":scheme");
bool is_connect = method && "CONNECT" == method->value;
bool having_host = http2::non_empty_value(host);
bool having_authority = http2::non_empty_value(authority);
if(is_connect) {
// Here we strictly require :authority header field.
if(scheme || path || !having_authority) {
upstream->rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
return 0;
}
} else {
// For proxy, :authority is required. Otherwise, we can accept
// :authority or host for methods.
if(!http2::non_empty_value(method) ||
!http2::non_empty_value(scheme) ||
(get_config()->http2_proxy && !having_authority) ||
(!get_config()->http2_proxy && !having_authority && !having_host) ||
!http2::non_empty_value(path)) {
upstream->rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
return 0;
}
}
downstream->set_request_method(http2::value_to_str(method));
downstream->set_request_http2_scheme(http2::value_to_str(scheme));
downstream->set_request_http2_authority(http2::value_to_str(authority));
downstream->set_request_path(http2::value_to_str(path));
if(!(frame->hd.flags & NGHTTP2_FLAG_END_STREAM)) {
downstream->set_request_http2_expect_body(true);
}
downstream->inspect_http2_request();
downstream->set_request_state(Downstream::HEADER_COMPLETE);
if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
downstream->disable_upstream_rtimer();
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
upstream->maintain_downstream_concurrency();
return 0;
}
} // namespace
void Http2Upstream::maintain_downstream_concurrency()
{
while(get_config()->max_downstream_connections >
downstream_queue_.num_active()) {
if(downstream_queue_.pending_empty()) {
break;
}
{
auto downstream = downstream_queue_.pending_top();
if(downstream->get_request_state() != Downstream::HEADER_COMPLETE &&
downstream->get_request_state() != Downstream::MSG_COMPLETE) {
break;
}
}
auto downstream = downstream_queue_.pop_pending();
if(!downstream) {
break;
}
initiate_downstream(std::move(downstream));
}
}
void Http2Upstream::initiate_downstream(std::unique_ptr<Downstream> downstream)
{
int rv;
rv = downstream->attach_downstream_connection
(handler_->get_downstream_connection());
if(rv != 0) {
// downstream connection fails, send error page
if(error_reply(downstream.get(), 503) != 0) {
rst_stream(downstream.get(), NGHTTP2_INTERNAL_ERROR);
}
downstream->set_request_state(Downstream::CONNECT_FAIL);
downstream_queue_.add_failure(std::move(downstream));
return;
}
rv = downstream->push_request_headers();
if(rv != 0) {
if(error_reply(downstream.get(), 503) != 0) {
rst_stream(downstream.get(), NGHTTP2_INTERNAL_ERROR);
}
downstream_queue_.add_failure(std::move(downstream));
return;
}
downstream_queue_.add_active(std::move(downstream));
return;
}
namespace {
int on_frame_recv_callback
(nghttp2_session *session, const nghttp2_frame *frame, void *user_data)
{
int rv;
if(get_config()->upstream_frame_debug) {
verbose_on_frame_recv_callback(session, frame, user_data);
}
auto upstream = static_cast<Http2Upstream*>(user_data);
switch(frame->hd.type) {
case NGHTTP2_DATA: {
auto downstream = upstream->find_downstream(frame->hd.stream_id);
if(!downstream) {
return 0;
}
if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
downstream->disable_upstream_rtimer();
downstream->end_upload_data();
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
break;
}
case NGHTTP2_HEADERS: {
auto downstream = upstream->find_downstream(frame->hd.stream_id);
if(!downstream) {
return 0;
}
if(frame->headers.cat == NGHTTP2_HCAT_REQUEST) {
downstream->reset_upstream_rtimer();
return on_request_headers(upstream, downstream, session, frame);
}
if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
downstream->disable_upstream_rtimer();
downstream->end_upload_data();
downstream->set_request_state(Downstream::MSG_COMPLETE);
} else {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
break;
}
case NGHTTP2_PRIORITY: {
// TODO comment out for now
// rv = downstream->change_priority(frame->priority.pri);
// if(rv != 0) {
// return NGHTTP2_ERR_CALLBACK_FAILURE;
// }
break;
}
case NGHTTP2_SETTINGS:
if((frame->hd.flags & NGHTTP2_FLAG_ACK) == 0) {
break;
}
upstream->stop_settings_timer();
break;
case NGHTTP2_PUSH_PROMISE:
rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
frame->push_promise.promised_stream_id,
NGHTTP2_REFUSED_STREAM);
if(rv != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
break;
case NGHTTP2_GOAWAY:
if(LOG_ENABLED(INFO)) {
auto debug_data = util::ascii_dump(frame->goaway.opaque_data,
frame->goaway.opaque_data_len);
ULOG(INFO, upstream) << "GOAWAY received: last-stream-id="
<< frame->goaway.last_stream_id
<< ", error_code="
<< frame->goaway.error_code
<< ", debug_data="
<< debug_data;
}
break;
default:
break;
}
return 0;
}
} // namespace
namespace {
int on_data_chunk_recv_callback(nghttp2_session *session,
uint8_t flags, int32_t stream_id,
const uint8_t *data, size_t len,
void *user_data)
{
auto upstream = static_cast<Http2Upstream*>(user_data);
auto downstream = upstream->find_downstream(stream_id);
if(!downstream || !downstream->get_downstream_connection()) {
if(upstream->consume(stream_id, len) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
downstream->reset_upstream_rtimer();
if(downstream->push_upload_data_chunk(data, len) != 0) {
upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
if(upstream->consume(stream_id, len) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
return 0;
}
} // namespace
namespace {
int on_frame_send_callback(nghttp2_session* session,
const nghttp2_frame *frame, void *user_data)
{
if(get_config()->upstream_frame_debug) {
verbose_on_frame_send_callback(session, frame, user_data);
}
auto upstream = static_cast<Http2Upstream*>(user_data);
switch(frame->hd.type) {
case NGHTTP2_SETTINGS:
if((frame->hd.flags & NGHTTP2_FLAG_ACK) == 0 &&
upstream->start_settings_timer() != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
break;
case NGHTTP2_GOAWAY:
if(LOG_ENABLED(INFO)) {
auto debug_data = util::ascii_dump(frame->goaway.opaque_data,
frame->goaway.opaque_data_len);
ULOG(INFO, upstream) << "Sending GOAWAY: last-stream-id="
<< frame->goaway.last_stream_id
<< ", error_code="
<< frame->goaway.error_code
<< ", debug_data="
<< debug_data;
}
break;
}
return 0;
}
} // namespace
namespace {
int on_frame_not_send_callback(nghttp2_session *session,
const nghttp2_frame *frame,
int lib_error_code, void *user_data)
{
auto upstream = static_cast<Http2Upstream*>(user_data);
ULOG(WARN, upstream) << "Failed to send control frame type="
<< static_cast<uint32_t>(frame->hd.type)
<< ", lib_error_code=" << lib_error_code << ":"
<< nghttp2_strerror(lib_error_code);
if(frame->hd.type == NGHTTP2_HEADERS &&
frame->headers.cat == NGHTTP2_HCAT_RESPONSE) {
// To avoid stream hanging around, issue RST_STREAM.
auto downstream = upstream->find_downstream(frame->hd.stream_id);
if(downstream) {
upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
}
}
return 0;
}
} // namespace
namespace {
uint32_t infer_upstream_rst_stream_error_code(uint32_t downstream_error_code)
{
// NGHTTP2_REFUSED_STREAM is important because it tells upstream
// client to retry.
switch(downstream_error_code) {
case NGHTTP2_NO_ERROR:
case NGHTTP2_REFUSED_STREAM:
return downstream_error_code;
default:
return NGHTTP2_INTERNAL_ERROR;
}
}
} // namespace
Http2Upstream::Http2Upstream(ClientHandler *handler)
: handler_(handler),
session_(nullptr),
settings_timerev_(nullptr)
{
reset_timeouts();
int rv;
nghttp2_session_callbacks *callbacks;
rv = nghttp2_session_callbacks_new(&callbacks);
assert(rv == 0);
auto callbacks_deleter =
util::defer(callbacks, nghttp2_session_callbacks_del);
nghttp2_session_callbacks_set_on_stream_close_callback
(callbacks, on_stream_close_callback);
nghttp2_session_callbacks_set_on_frame_recv_callback
(callbacks, on_frame_recv_callback);
nghttp2_session_callbacks_set_on_data_chunk_recv_callback
(callbacks, on_data_chunk_recv_callback);
nghttp2_session_callbacks_set_on_frame_send_callback
(callbacks, on_frame_send_callback);
nghttp2_session_callbacks_set_on_frame_not_send_callback
(callbacks, on_frame_not_send_callback);
nghttp2_session_callbacks_set_on_header_callback
(callbacks, on_header_callback);
nghttp2_session_callbacks_set_on_begin_headers_callback
(callbacks, on_begin_headers_callback);
if(get_config()->padding) {
nghttp2_session_callbacks_set_select_padding_callback
(callbacks, http::select_padding_callback);
}
rv = nghttp2_session_server_new2(&session_, callbacks, this,
get_config()->http2_option);
assert(rv == 0);
flow_control_ = true;
// TODO Maybe call from outside?
nghttp2_settings_entry entry[2];
entry[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
entry[0].value = get_config()->http2_max_concurrent_streams;
entry[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
entry[1].value = (1 << get_config()->http2_upstream_window_bits) - 1;
rv = nghttp2_submit_settings(session_, NGHTTP2_FLAG_NONE,
entry, util::array_size(entry));
if(rv != 0) {
ULOG(ERROR, this) << "nghttp2_submit_settings() returned error: "
<< nghttp2_strerror(rv);
}
if(get_config()->http2_upstream_connection_window_bits > 16) {
int32_t delta = (1 << get_config()->http2_upstream_connection_window_bits)
- 1 - NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE;
rv = nghttp2_submit_window_update(session_, NGHTTP2_FLAG_NONE, 0, delta);
if(rv != 0) {
ULOG(ERROR, this) << "nghttp2_submit_window_update() returned error: "
<< nghttp2_strerror(rv);
}
}
if(!get_config()->altsvcs.empty()) {
// Set max_age to 24hrs, which is default for alt-svc header
// field.
for(auto& altsvc : get_config()->altsvcs) {
rv = nghttp2_submit_altsvc
(session_, NGHTTP2_FLAG_NONE, 0,
86400,
altsvc.port,
reinterpret_cast<const uint8_t*>(altsvc.protocol_id),
altsvc.protocol_id_len,
reinterpret_cast<const uint8_t*>(altsvc.host),
altsvc.host_len,
reinterpret_cast<const uint8_t*>(altsvc.origin),
altsvc.origin_len);
if(rv != 0) {
ULOG(ERROR, this) << "nghttp2_submit_altsvc() returned error: "
<< nghttp2_strerror(rv);
}
}
}
}
Http2Upstream::~Http2Upstream()
{
nghttp2_session_del(session_);
if(settings_timerev_) {
event_free(settings_timerev_);
}
}
int Http2Upstream::on_read()
{
ssize_t rv = 0;
auto bev = handler_->get_bev();
auto input = bufferevent_get_input(bev);
for(;;) {
auto inputlen = evbuffer_get_contiguous_space(input);
if(inputlen == 0) {
assert(evbuffer_get_length(input) == 0);
return send();
}
auto mem = evbuffer_pullup(input, inputlen);
rv = nghttp2_session_mem_recv(session_, mem, inputlen);
if(rv < 0) {
ULOG(ERROR, this) << "nghttp2_session_recv() returned error: "
<< nghttp2_strerror(rv);
return -1;
}
if(evbuffer_drain(input, rv) != 0) {
DCLOG(FATAL, this) << "evbuffer_drain() failed";
return -1;
}
}
}
int Http2Upstream::on_write()
{
return send();
}
// After this function call, downstream may be deleted.
int Http2Upstream::send()
{
int rv;
uint8_t buf[16384];
auto bev = handler_->get_bev();
auto output = bufferevent_get_output(bev);
sendbuf.reset(output, buf, sizeof(buf), handler_->get_write_limit());
for(;;) {
// Check buffer length and break if it is large enough.
if(handler_->get_outbuf_length() + sendbuf.get_buflen() >=
OUTBUF_MAX_THRES) {
break;
}
const uint8_t *data;
auto datalen = nghttp2_session_mem_send(session_, &data);
if(datalen < 0) {
ULOG(ERROR, this) << "nghttp2_session_mem_send() returned error: "
<< nghttp2_strerror(datalen);
return -1;
}
if(datalen == 0) {
break;
}
rv = sendbuf.add(data, datalen);
if(rv != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
}
rv = sendbuf.flush();
if(rv != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
handler_->update_warmup_writelen(sendbuf.get_writelen());
if(nghttp2_session_want_read(session_) == 0 &&
nghttp2_session_want_write(session_) == 0 &&
handler_->get_outbuf_length() == 0) {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "No more read/write for this HTTP2 session";
}
return -1;
}
return 0;
}
int Http2Upstream::on_event()
{
return 0;
}
ClientHandler* Http2Upstream::get_client_handler() const
{
return handler_;
}
namespace {
void downstream_readcb(bufferevent *bev, void *ptr)
{
auto dconn = static_cast<DownstreamConnection*>(ptr);
auto downstream = dconn->get_downstream();
auto upstream = static_cast<Http2Upstream*>(downstream->get_upstream());
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
// If upstream HTTP2 stream was closed, we just close downstream,
// because there is no consumer now. Downstream connection is also
// closed in this case.
upstream->remove_downstream(downstream);
// downstream was deleted
return;
}
if(downstream->get_response_state() == Downstream::MSG_RESET) {
// The downstream stream was reset (canceled). In this case,
// RST_STREAM to the upstream and delete downstream connection
// here. Deleting downstream will be taken place at
// on_stream_close_callback.
upstream->rst_stream(downstream, infer_upstream_rst_stream_error_code
(downstream->get_response_rst_stream_error_code()));
downstream->pop_downstream_connection();
// dconn was deleted
dconn = nullptr;
} else {
auto rv = downstream->on_read();
if(rv != 0) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "HTTP parser failure";
}
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
} else if(downstream->get_response_state() != Downstream::MSG_COMPLETE) {
// If response was completed, then don't issue RST_STREAM
if(upstream->error_reply(downstream, 502) != 0) {
delete upstream->get_client_handler();
return;
}
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
// Clearly, we have to close downstream connection on http parser
// failure.
downstream->pop_downstream_connection();
// dconn was deleted
dconn = nullptr;
}
}
if(upstream->send() != 0) {
delete upstream->get_client_handler();
return;
}
// At this point, downstream may be deleted.
}
} // namespace
namespace {
void downstream_writecb(bufferevent *bev, void *ptr)
{
if(evbuffer_get_length(bufferevent_get_output(bev)) > 0) {
return;
}
auto dconn = static_cast<DownstreamConnection*>(ptr);
dconn->on_write();
}
} // namespace
namespace {
void downstream_eventcb(bufferevent *bev, short events, void *ptr)
{
auto dconn = static_cast<DownstreamConnection*>(ptr);
auto downstream = dconn->get_downstream();
auto upstream = static_cast<Http2Upstream*>(downstream->get_upstream());
if(events & BEV_EVENT_CONNECTED) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Connection established. stream_id="
<< downstream->get_stream_id();
}
auto fd = bufferevent_getfd(bev);
int val = 1;
if(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
reinterpret_cast<char*>(&val), sizeof(val)) == -1) {
DCLOG(WARN, dconn) << "Setting option TCP_NODELAY failed: errno="
<< errno;
}
return;
}
if(events & BEV_EVENT_EOF) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "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);
// downstream was deleted
return;
}
// Delete downstream connection. If we don't delete it here, it
// will be pooled in on_stream_close_callback.
downstream->pop_downstream_connection();
// dconn was deleted
dconn = nullptr;
// 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(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Downstream body was ended by EOF";
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
// For tunneled connection, MSG_COMPLETE signals
// downstream_data_read_callback to send RST_STREAM after
// pending response body is sent. This is needed to ensure
// that RST_STREAM is sent after all pending data are sent.
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.
if(upstream->error_reply(downstream, 502) != 0) {
delete upstream->get_client_handler();
return;
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
}
if(upstream->send() != 0) {
delete upstream->get_client_handler();
return;
}
// At this point, downstream may be deleted.
return;
}
if(events & (BEV_EVENT_ERROR | BEV_EVENT_TIMEOUT)) {
if(LOG_ENABLED(INFO)) {
if(events & BEV_EVENT_ERROR) {
DCLOG(INFO, dconn) << "Downstream network error: "
<< evutil_socket_error_to_string
(EVUTIL_SOCKET_ERROR());
} else {
DCLOG(INFO, dconn) << "Timeout";
}
if(downstream->get_upgraded()) {
DCLOG(INFO, dconn) << "Note: this is tunnel connection";
}
}
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
upstream->remove_downstream(downstream);
// downstream was deleted
return;
}
// Delete downstream connection. If we don't delete it here, it
// will be pooled in on_stream_close_callback.
downstream->pop_downstream_connection();
// dconn was deleted
dconn = nullptr;
if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
// For SSL tunneling, we issue RST_STREAM. For other types of
// stream, we don't have to do anything since response was
// complete.
if(downstream->get_upgraded()) {
upstream->rst_stream(downstream, NGHTTP2_NO_ERROR);
}
} else {
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
if(downstream->get_upgraded()) {
upstream->on_downstream_body_complete(downstream);
} else {
upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
}
} else {
unsigned int status;
if(events & BEV_EVENT_TIMEOUT) {
status = 504;
} else {
status = 502;
}
if(upstream->error_reply(downstream, status) != 0) {
delete upstream->get_client_handler();
return;
}
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
}
if(upstream->send() != 0) {
delete upstream->get_client_handler();
return;
}
// At this point, downstream may be deleted.
return;
}
}
} // namespace
int Http2Upstream::rst_stream(Downstream *downstream, uint32_t error_code)
{
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "RST_STREAM stream_id="
<< downstream->get_stream_id()
<< " with error_code="
<< error_code;
}
int rv;
rv = nghttp2_submit_rst_stream(session_, NGHTTP2_FLAG_NONE,
downstream->get_stream_id(), error_code);
if(rv < NGHTTP2_ERR_FATAL) {
ULOG(FATAL, this) << "nghttp2_submit_rst_stream() failed: "
<< nghttp2_strerror(rv);
DIE();
}
return 0;
}
int Http2Upstream::terminate_session(uint32_t error_code)
{
int rv;
rv = nghttp2_session_terminate_session(session_, error_code);
if(rv != 0) {
return -1;
}
return 0;
}
namespace {
ssize_t downstream_data_read_callback(nghttp2_session *session,
int32_t stream_id,
uint8_t *buf, size_t length,
uint32_t *data_flags,
nghttp2_data_source *source,
void *user_data)
{
auto downstream = static_cast<Downstream*>(source->ptr);
auto upstream = static_cast<Http2Upstream*>(downstream->get_upstream());
auto body = downstream->get_response_body_buf();
auto handler = upstream->get_client_handler();
assert(body);
auto limit = handler->get_write_limit();
if(limit != -1) {
// 9 is HTTP/2 frame header length. Make DATA frame also under
// certain limit, so that application layer can flush at DATA
// frame boundary, instead of buffering large frame.
assert(limit > 9);
length = std::min(length, static_cast<size_t>(limit - 9));
}
int nread = evbuffer_remove(body, buf, length);
if(nread == -1) {
ULOG(FATAL, upstream) << "evbuffer_remove() failed";
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
auto body_empty = evbuffer_get_length(body) == 0;
if(body_empty &&
downstream->get_response_state() == Downstream::MSG_COMPLETE) {
*data_flags |= NGHTTP2_DATA_FLAG_EOF;
if(!downstream->get_upgraded()) {
if(nghttp2_session_get_stream_remote_close(session, stream_id) == 0) {
upstream->rst_stream(downstream, NGHTTP2_NO_ERROR);
}
} else {
// For tunneling, issue RST_STREAM to finish the stream.
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "RST_STREAM to tunneled stream stream_id="
<< stream_id;
}
upstream->rst_stream(downstream, NGHTTP2_NO_ERROR);
}
}
if(body_empty) {
downstream->disable_upstream_wtimer();
} else {
downstream->reset_upstream_wtimer();
}
if(nread > 0 && downstream->resume_read(SHRPX_NO_BUFFER, nread) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
if(nread == 0 && ((*data_flags) & NGHTTP2_DATA_FLAG_EOF) == 0) {
return NGHTTP2_ERR_DEFERRED;
}
if(nread > 0) {
downstream->add_response_sent_bodylen(nread);
}
return nread;
}
} // namespace
int Http2Upstream::error_reply(Downstream *downstream,
unsigned int status_code)
{
int rv;
auto html = http::create_error_html(status_code);
downstream->set_response_http_status(status_code);
downstream->init_response_body_buf();
auto body = downstream->get_response_body_buf();
rv = evbuffer_add(body, html.c_str(), html.size());
if(rv == -1) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
nghttp2_data_provider data_prd;
data_prd.source.ptr = downstream;
data_prd.read_callback = downstream_data_read_callback;
auto content_length = util::utos(html.size());
auto status_code_str = util::utos(status_code);
auto nva = std::vector<nghttp2_nv>{
http2::make_nv_ls(":status", status_code_str),
http2::make_nv_ll("content-type", "text/html; charset=UTF-8"),
http2::make_nv_lc("server", get_config()->server_name),
http2::make_nv_ls("content-length", content_length)
};
rv = nghttp2_submit_response(session_, downstream->get_stream_id(),
nva.data(), nva.size(), &data_prd);
if(rv < NGHTTP2_ERR_FATAL) {
ULOG(FATAL, this) << "nghttp2_submit_response() failed: "
<< nghttp2_strerror(rv);
DIE();
}
return 0;
}
bufferevent_data_cb Http2Upstream::get_downstream_readcb()
{
return downstream_readcb;
}
bufferevent_data_cb Http2Upstream::get_downstream_writecb()
{
return downstream_writecb;
}
bufferevent_event_cb Http2Upstream::get_downstream_eventcb()
{
return downstream_eventcb;
}
void Http2Upstream::add_pending_downstream
(std::unique_ptr<Downstream> downstream)
{
downstream_queue_.add_pending(std::move(downstream));
}
void Http2Upstream::remove_downstream(Downstream *downstream)
{
if(downstream->accesslog_ready()) {
handler_->write_accesslog(downstream);
}
downstream_queue_.remove(downstream->get_stream_id());
maintain_downstream_concurrency();
}
Downstream* Http2Upstream::find_downstream(int32_t stream_id)
{
return downstream_queue_.find(stream_id);
}
nghttp2_session* Http2Upstream::get_http2_session()
{
return session_;
}
// WARNING: Never call directly or indirectly nghttp2_session_send or
// nghttp2_session_recv. These calls may delete downstream.
int Http2Upstream::on_downstream_header_complete(Downstream *downstream)
{
int rv;
if(LOG_ENABLED(INFO)) {
if(downstream->get_non_final_response()) {
DLOG(INFO, downstream) << "HTTP non-final response header";
} else {
DLOG(INFO, downstream) << "HTTP response header completed";
}
}
downstream->normalize_response_headers();
if(!get_config()->http2_proxy && !get_config()->client_proxy &&
!get_config()->no_location_rewrite) {
downstream->rewrite_norm_location_response_header
(get_client_handler()->get_upstream_scheme(), get_config()->port);
}
auto end_headers = std::end(downstream->get_response_headers());
size_t nheader = downstream->get_response_headers().size();
auto nva = std::vector<nghttp2_nv>();
// 3 means :status and possible server and via header field.
nva.reserve(nheader + 3 + get_config()->add_response_headers.size());
std::string via_value;
auto response_status = util::utos(downstream->get_response_http_status());
nva.push_back(http2::make_nv_ls(":status", response_status));
http2::copy_norm_headers_to_nva(nva, downstream->get_response_headers());
if(downstream->get_non_final_response()) {
if(LOG_ENABLED(INFO)) {
log_response_headers(downstream, nva);
}
rv = nghttp2_submit_headers(session_, NGHTTP2_FLAG_NONE,
downstream->get_stream_id(), nullptr,
nva.data(), nva.size(), nullptr);
downstream->clear_response_headers();
if(rv != 0) {
ULOG(FATAL, this) << "nghttp2_submit_headers() failed";
return -1;
}
return 0;
}
if(!get_config()->http2_proxy && !get_config()->client_proxy) {
nva.push_back(http2::make_nv_lc("server", get_config()->server_name));
} else {
auto server = downstream->get_norm_response_header("server");
if(server != end_headers) {
nva.push_back(http2::make_nv_ls("server", (*server).value));
}
}
auto via = downstream->get_norm_response_header("via");
if(get_config()->no_via) {
if(via != end_headers) {
nva.push_back(http2::make_nv_ls("via", (*via).value));
}
} else {
if(via != end_headers) {
via_value = (*via).value;
via_value += ", ";
}
via_value += http::create_via_header_value
(downstream->get_response_major(), downstream->get_response_minor());
nva.push_back(http2::make_nv_ls("via", via_value));
}
for(auto& p : get_config()->add_response_headers) {
nva.push_back(http2::make_nv(p.first, p.second));
}
if(LOG_ENABLED(INFO)) {
log_response_headers(downstream, nva);
}
if(get_config()->http2_upstream_dump_response_header) {
http2::dump_nv(get_config()->http2_upstream_dump_response_header,
nva.data(), nva.size());
}
nghttp2_data_provider data_prd;
data_prd.source.ptr = downstream;
data_prd.read_callback = downstream_data_read_callback;
nghttp2_data_provider *data_prdptr;
if(downstream->expect_response_body()) {
data_prdptr = &data_prd;
} else {
data_prdptr = nullptr;
}
rv = nghttp2_submit_response(session_, downstream->get_stream_id(),
nva.data(), nva.size(),data_prdptr);
if(rv != 0) {
ULOG(FATAL, this) << "nghttp2_submit_response() failed";
return -1;
}
return 0;
}
// WARNING: Never call directly or indirectly nghttp2_session_send or
// nghttp2_session_recv. These calls may delete downstream.
int Http2Upstream::on_downstream_body(Downstream *downstream,
const uint8_t *data, size_t len,
bool flush)
{
auto body = downstream->get_response_body_buf();
int rv = evbuffer_add(body, data, len);
if(rv != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
if(flush) {
nghttp2_session_resume_data(session_, downstream->get_stream_id());
downstream->ensure_upstream_wtimer();
}
if(evbuffer_get_length(body) >= INBUF_MAX_THRES) {
if(!flush) {
nghttp2_session_resume_data(session_, downstream->get_stream_id());
downstream->ensure_upstream_wtimer();
}
downstream->pause_read(SHRPX_NO_BUFFER);
}
return 0;
}
// WARNING: Never call directly or indirectly nghttp2_session_send or
// nghttp2_session_recv. These calls may delete downstream.
int Http2Upstream::on_downstream_body_complete(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "HTTP response completed";
}
nghttp2_session_resume_data(session_, downstream->get_stream_id());
downstream->ensure_upstream_wtimer();
return 0;
}
bool Http2Upstream::get_flow_control() const
{
return flow_control_;
}
void Http2Upstream::pause_read(IOCtrlReason reason)
{}
int Http2Upstream::resume_read(IOCtrlReason reason, Downstream *downstream,
size_t consumed)
{
if(get_flow_control()) {
assert(downstream->get_request_datalen() >= consumed);
if(consume(downstream->get_stream_id(), consumed) != 0) {
return -1;
}
downstream->dec_request_datalen(consumed);
}
return send();
}
int Http2Upstream::on_downstream_abort_request(Downstream *downstream,
unsigned int status_code)
{
int rv;
rv = error_reply(downstream, status_code);
if(rv != 0) {
return -1;
}
return send();
}
int Http2Upstream::consume(int32_t stream_id, size_t len)
{
int rv;
rv = nghttp2_session_consume(session_, stream_id, len);
if(rv != 0) {
ULOG(WARN, this) << "nghttp2_session_consume() returned error: "
<< nghttp2_strerror(rv);
return -1;
}
return 0;
}
void Http2Upstream::log_response_headers
(Downstream *downstream, const std::vector<nghttp2_nv>& nva) const
{
std::stringstream ss;
for(auto& nv : nva) {
ss << TTY_HTTP_HD;
ss.write(reinterpret_cast<const char*>(nv.name), nv.namelen);
ss << TTY_RST << ": ";
ss.write(reinterpret_cast<const char*>(nv.value), nv.valuelen);
ss << "\n";
}
ULOG(INFO, this) << "HTTP response headers. stream_id="
<< downstream->get_stream_id() << "\n"
<< ss.str();
}
int Http2Upstream::on_timeout(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "Stream timeout stream_id="
<< downstream->get_stream_id();
}
rst_stream(downstream, NGHTTP2_NO_ERROR);
return 0;
}
void Http2Upstream::reset_timeouts()
{
handler_->set_upstream_timeouts(&get_config()->http2_upstream_read_timeout,
&get_config()->upstream_write_timeout);
}
void Http2Upstream::on_handler_delete()
{
for(auto& ent : downstream_queue_.get_active_downstreams()) {
if(ent.second->accesslog_ready()) {
handler_->write_accesslog(ent.second.get());
}
}
}
} // namespace shrpx
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