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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.h"
#include "shrpx_http2_session.h"
#ifdef HAVE_MRUBY
#include "shrpx_mruby.h"
#endif // HAVE_MRUBY
#include "http2.h"
#include "util.h"
#include "base64.h"
#include "app_helper.h"
#include "template.h"
using namespace nghttp2;
namespace shrpx {
namespace {
constexpr size_t MAX_BUFFER_SIZE = 32_k;
} // 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 = static_cast<Downstream *>(
nghttp2_session_get_stream_user_data(session, stream_id));
if (!downstream) {
return 0;
}
auto &req = downstream->request();
upstream->consume(stream_id, req.unconsumed_body_length);
req.unconsumed_body_length = 0;
if (downstream->get_request_state() == Downstream::CONNECT_FAIL) {
upstream->remove_downstream(downstream);
// downstream was deleted
return 0;
}
if (downstream->can_detach_downstream_connection()) {
// Keep-alive
downstream->detach_downstream_connection();
}
downstream->set_request_state(Downstream::STREAM_CLOSED);
// 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_upgrade2(
session_, reinterpret_cast<const uint8_t *>(settings_payload.c_str()),
settings_payload.size(),
http->get_downstream()->request().method == HTTP_HEAD, nullptr);
if (rv != 0) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, 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->reset_upstream_rtimer();
downstream->set_stream_id(1);
auto ptr = downstream.get();
nghttp2_session_set_stream_user_data(session_, 1, ptr);
downstream_queue_.add_pending(std::move(downstream));
downstream_queue_.mark_active(ptr);
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "Connection upgraded to HTTP/2";
}
return 0;
}
void Http2Upstream::start_settings_timer() {
ev_timer_start(handler_->get_loop(), &settings_timer_);
}
void Http2Upstream::stop_settings_timer() {
ev_timer_stop(handler_->get_loop(), &settings_timer_);
}
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()->http2.upstream.debug.frame_debug) {
verbose_on_header_callback(session, frame, name, namelen, value, valuelen,
flags, user_data);
}
if (frame->hd.type != NGHTTP2_HEADERS) {
return 0;
}
auto upstream = static_cast<Http2Upstream *>(user_data);
auto downstream = static_cast<Downstream *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!downstream) {
return 0;
}
auto &req = downstream->request();
auto &httpconf = get_config()->http;
if (req.fs.buffer_size() + namelen + valuelen >
httpconf.request_header_field_buffer ||
req.fs.num_fields() >= httpconf.max_request_header_fields) {
if (downstream->get_response_state() == Downstream::MSG_COMPLETE) {
return 0;
}
if (LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Too large or many header field size="
<< req.fs.buffer_size() + namelen + valuelen
<< ", num=" << req.fs.num_fields() + 1;
}
// just ignore header fields if this is trailer part.
if (frame->headers.cat == NGHTTP2_HCAT_HEADERS) {
return 0;
}
if (upstream->error_reply(downstream, 431) != 0) {
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
return 0;
}
auto token = http2::lookup_token(name, namelen);
auto no_index = flags & NGHTTP2_NV_FLAG_NO_INDEX;
if (frame->headers.cat == NGHTTP2_HCAT_HEADERS) {
// just store header fields for trailer part
req.fs.add_trailer_token(StringRef{name, namelen},
StringRef{value, valuelen}, no_index, token);
return 0;
}
req.fs.add_header_token(StringRef{name, namelen}, StringRef{value, valuelen},
no_index, token);
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;
}
auto handler = upstream->get_client_handler();
auto downstream = make_unique<Downstream>(upstream, handler->get_mcpool(),
frame->hd.stream_id);
nghttp2_session_set_stream_user_data(session, frame->hd.stream_id,
downstream.get());
downstream->reset_upstream_rtimer();
auto &req = downstream->request();
// Although, we deprecated minor version from HTTP/2, we supply
// minor version 0 to use via header field in a conventional way.
req.http_major = 2;
req.http_minor = 0;
upstream->add_pending_downstream(std::move(downstream));
return 0;
}
} // namespace
int Http2Upstream::on_request_headers(Downstream *downstream,
const nghttp2_frame *frame) {
if (downstream->get_response_state() == Downstream::MSG_COMPLETE) {
return 0;
}
auto &req = downstream->request();
auto &nva = req.fs.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, this) << "HTTP request headers. stream_id="
<< downstream->get_stream_id() << "\n" << ss.str();
}
auto &dump = get_config()->http2.upstream.debug.dump;
if (dump.request_header) {
http2::dump_nv(dump.request_header, nva);
}
auto content_length = req.fs.header(http2::HD_CONTENT_LENGTH);
if (content_length) {
// libnghttp2 guarantees this can be parsed
req.fs.content_length = util::parse_uint(content_length->value);
}
// presence of mandatory header fields are guaranteed by libnghttp2.
auto authority = req.fs.header(http2::HD__AUTHORITY);
auto path = req.fs.header(http2::HD__PATH);
auto method = req.fs.header(http2::HD__METHOD);
auto scheme = req.fs.header(http2::HD__SCHEME);
auto method_token = http2::lookup_method_token(method->value);
if (method_token == -1) {
if (error_reply(downstream, 501) != 0) {
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
return 0;
}
// For HTTP/2 proxy, we request :authority.
if (method_token != HTTP_CONNECT && get_config()->http2_proxy && !authority) {
rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
return 0;
}
req.method = method_token;
req.scheme = http2::value_to_str(scheme);
// nghttp2 library guarantees either :authority or host exist
if (!authority) {
req.no_authority = true;
authority = req.fs.header(http2::HD_HOST);
}
req.authority = http2::value_to_str(authority);
if (path) {
if (method_token == HTTP_OPTIONS && path->value == "*") {
// Server-wide OPTIONS request. Path is empty.
} else if (get_config()->http2_proxy || get_config()->client_proxy) {
req.path = http2::value_to_str(path);
} else {
const auto &value = path->value;
req.path = http2::rewrite_clean_path(std::begin(value), std::end(value));
}
}
if (!(frame->hd.flags & NGHTTP2_FLAG_END_STREAM)) {
req.http2_expect_body = true;
}
downstream->inspect_http2_request();
downstream->set_request_state(Downstream::HEADER_COMPLETE);
#ifdef HAVE_MRUBY
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
auto worker = handler->get_worker();
auto mruby_ctx = worker->get_mruby_context();
if (mruby_ctx->run_on_request_proc(downstream) != 0) {
if (error_reply(downstream, 500) != 0) {
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
return 0;
}
#endif // HAVE_MRUBY
if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
downstream->disable_upstream_rtimer();
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
if (downstream->get_response_state() == Downstream::MSG_COMPLETE) {
return 0;
}
start_downstream(downstream);
return 0;
}
void Http2Upstream::start_downstream(Downstream *downstream) {
if (downstream_queue_.can_activate(downstream->request().authority)) {
initiate_downstream(downstream);
return;
}
downstream_queue_.mark_blocked(downstream);
}
void Http2Upstream::initiate_downstream(Downstream *downstream) {
int rv;
rv = downstream->attach_downstream_connection(
handler_->get_downstream_connection(downstream));
if (rv != 0) {
// downstream connection fails, send error page
if (error_reply(downstream, 503) != 0) {
rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
}
downstream->set_request_state(Downstream::CONNECT_FAIL);
downstream_queue_.mark_failure(downstream);
return;
}
rv = downstream->push_request_headers();
if (rv != 0) {
if (error_reply(downstream, 503) != 0) {
rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
}
downstream_queue_.mark_failure(downstream);
return;
}
downstream_queue_.mark_active(downstream);
return;
}
namespace {
int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,
void *user_data) {
if (get_config()->http2.upstream.debug.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 = static_cast<Downstream *>(
nghttp2_session_get_stream_user_data(session, 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);
}
return 0;
}
case NGHTTP2_HEADERS: {
auto downstream = static_cast<Downstream *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!downstream) {
return 0;
}
if (frame->headers.cat == NGHTTP2_HCAT_REQUEST) {
downstream->reset_upstream_rtimer();
return upstream->on_request_headers(downstream, frame);
}
if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
downstream->disable_upstream_rtimer();
downstream->end_upload_data();
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
return 0;
}
case NGHTTP2_SETTINGS:
if ((frame->hd.flags & NGHTTP2_FLAG_ACK) == 0) {
return 0;
}
upstream->stop_settings_timer();
return 0;
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;
}
return 0;
default:
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 = static_cast<Downstream *>(
nghttp2_session_get_stream_user_data(session, 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()->http2.upstream.debug.frame_debug) {
verbose_on_frame_send_callback(session, frame, user_data);
}
auto upstream = static_cast<Http2Upstream *>(user_data);
auto handler = upstream->get_client_handler();
switch (frame->hd.type) {
case NGHTTP2_DATA:
case NGHTTP2_HEADERS: {
if ((frame->hd.flags & NGHTTP2_FLAG_END_STREAM) == 0) {
return 0;
}
// RST_STREAM if request is still incomplete.
auto stream_id = frame->hd.stream_id;
auto downstream = static_cast<Downstream *>(
nghttp2_session_get_stream_user_data(session, stream_id));
if (!downstream) {
return 0;
}
// For tunneling, issue RST_STREAM to finish the stream.
if (downstream->get_upgraded() ||
nghttp2_session_get_stream_remote_close(session, stream_id) == 0) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, upstream)
<< "Send RST_STREAM to "
<< (downstream->get_upgraded() ? "tunneled " : "")
<< "stream stream_id=" << downstream->get_stream_id()
<< " to finish off incomplete request";
}
upstream->rst_stream(downstream, NGHTTP2_NO_ERROR);
}
return 0;
}
case NGHTTP2_SETTINGS:
if ((frame->hd.flags & NGHTTP2_FLAG_ACK) == 0) {
upstream->start_settings_timer();
}
return 0;
case NGHTTP2_PUSH_PROMISE: {
auto promised_stream_id = frame->push_promise.promised_stream_id;
if (nghttp2_session_get_stream_user_data(session, promised_stream_id)) {
// In case of push from backend, downstream object was already
// created.
return 0;
}
auto promised_downstream = make_unique<Downstream>(
upstream, handler->get_mcpool(), promised_stream_id);
auto &req = promised_downstream->request();
// As long as we use nghttp2_session_mem_send(), setting stream
// user data here should not fail. This is because this callback
// is called just after frame was serialized. So no worries about
// hanging Downstream.
nghttp2_session_set_stream_user_data(session, promised_stream_id,
promised_downstream.get());
promised_downstream->set_assoc_stream_id(frame->hd.stream_id);
promised_downstream->disable_upstream_rtimer();
req.http_major = 2;
req.http_minor = 0;
for (size_t i = 0; i < frame->push_promise.nvlen; ++i) {
auto &nv = frame->push_promise.nva[i];
auto token = http2::lookup_token(nv.name, nv.namelen);
switch (token) {
case http2::HD__METHOD:
req.method = http2::lookup_method_token(nv.value, nv.valuelen);
break;
case http2::HD__SCHEME:
req.scheme.assign(nv.value, nv.value + nv.valuelen);
break;
case http2::HD__AUTHORITY:
req.authority.assign(nv.value, nv.value + nv.valuelen);
break;
case http2::HD__PATH:
req.path = http2::rewrite_clean_path(nv.value, nv.value + nv.valuelen);
break;
}
req.fs.add_header_token(StringRef{nv.name, nv.namelen},
StringRef{nv.value, nv.valuelen},
nv.flags & NGHTTP2_NV_FLAG_NO_INDEX, token);
}
promised_downstream->inspect_http2_request();
promised_downstream->set_request_state(Downstream::MSG_COMPLETE);
// a bit weird but start_downstream() expects that given
// downstream is in pending queue.
auto ptr = promised_downstream.get();
upstream->add_pending_downstream(std::move(promised_downstream));
#ifdef HAVE_MRUBY
auto worker = handler->get_worker();
auto mruby_ctx = worker->get_mruby_context();
if (mruby_ctx->run_on_request_proc(ptr) != 0) {
if (upstream->error_reply(ptr, 500) != 0) {
upstream->rst_stream(ptr, NGHTTP2_INTERNAL_ERROR);
return 0;
}
return 0;
}
#endif // HAVE_MRUBY
upstream->start_downstream(ptr);
return 0;
}
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;
}
return 0;
default:
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);
if (LOG_ENABLED(INFO)) {
ULOG(INFO, 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 &&
lib_error_code != NGHTTP2_ERR_STREAM_CLOSED &&
lib_error_code != NGHTTP2_ERR_STREAM_CLOSING) {
// To avoid stream hanging around, issue RST_STREAM.
auto downstream = static_cast<Downstream *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (downstream) {
upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
}
}
return 0;
}
} // namespace
namespace {
constexpr auto PADDING = std::array<uint8_t, 256>{};
} // namespace
namespace {
int send_data_callback(nghttp2_session *session, nghttp2_frame *frame,
const uint8_t *framehd, size_t length,
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_buf();
auto wb = upstream->get_response_buf();
size_t padlen = 0;
wb->append(framehd, 9);
if (frame->data.padlen > 0) {
padlen = frame->data.padlen - 1;
wb->append(static_cast<uint8_t>(padlen));
}
body->remove(*wb, length);
wb->append(PADDING.data(), padlen);
downstream->reset_upstream_wtimer();
if (length > 0 && downstream->resume_read(SHRPX_NO_BUFFER, length) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
// We have to add length here, so that we can log this amount of
// data transferred.
downstream->response_sent_body_length += length;
return wb->rleft() >= MAX_BUFFER_SIZE ? NGHTTP2_ERR_PAUSE : 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
namespace {
void settings_timeout_cb(struct ev_loop *loop, ev_timer *w, int revents) {
auto upstream = static_cast<Http2Upstream *>(w->data);
auto handler = upstream->get_client_handler();
ULOG(INFO, upstream) << "SETTINGS timeout";
if (upstream->terminate_session(NGHTTP2_SETTINGS_TIMEOUT) != 0) {
delete handler;
return;
}
handler->signal_write();
}
} // namespace
namespace {
void shutdown_timeout_cb(struct ev_loop *loop, ev_timer *w, int revents) {
auto upstream = static_cast<Http2Upstream *>(w->data);
auto handler = upstream->get_client_handler();
upstream->submit_goaway();
handler->signal_write();
}
} // namespace
namespace {
void prepare_cb(struct ev_loop *loop, ev_prepare *w, int revents) {
auto upstream = static_cast<Http2Upstream *>(w->data);
upstream->check_shutdown();
}
} // namespace
void Http2Upstream::submit_goaway() {
auto last_stream_id = nghttp2_session_get_last_proc_stream_id(session_);
nghttp2_submit_goaway(session_, NGHTTP2_FLAG_NONE, last_stream_id,
NGHTTP2_NO_ERROR, nullptr, 0);
}
void Http2Upstream::check_shutdown() {
int rv;
if (shutdown_handled_) {
return;
}
auto worker = handler_->get_worker();
if (worker->get_graceful_shutdown()) {
shutdown_handled_ = true;
rv = nghttp2_submit_shutdown_notice(session_);
if (rv != 0) {
ULOG(FATAL, this) << "nghttp2_submit_shutdown_notice() failed: "
<< nghttp2_strerror(rv);
return;
}
handler_->signal_write();
ev_timer_start(handler_->get_loop(), &shutdown_timer_);
}
}
nghttp2_session_callbacks *create_http2_upstream_callbacks() {
int rv;
nghttp2_session_callbacks *callbacks;
rv = nghttp2_session_callbacks_new(&callbacks);
if (rv != 0) {
return nullptr;
}
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);
nghttp2_session_callbacks_set_send_data_callback(callbacks,
send_data_callback);
if (get_config()->padding) {
nghttp2_session_callbacks_set_select_padding_callback(
callbacks, http::select_padding_callback);
}
return callbacks;
}
Http2Upstream::Http2Upstream(ClientHandler *handler)
: wb_(handler->get_worker()->get_mcpool()),
downstream_queue_(
get_config()->http2_proxy
? get_config()->conn.downstream.connections_per_host
: get_config()->conn.downstream.proto == PROTO_HTTP
? get_config()->conn.downstream.connections_per_frontend
: 0,
!get_config()->http2_proxy),
handler_(handler),
session_(nullptr),
shutdown_handled_(false) {
int rv;
auto &http2conf = get_config()->http2;
rv = nghttp2_session_server_new2(&session_, http2conf.upstream.callbacks,
this, http2conf.upstream.option);
assert(rv == 0);
flow_control_ = true;
// TODO Maybe call from outside?
std::array<nghttp2_settings_entry, 2> entry;
entry[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
entry[0].value = http2conf.max_concurrent_streams;
entry[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
entry[1].value = (1 << http2conf.upstream.window_bits) - 1;
rv = nghttp2_submit_settings(session_, NGHTTP2_FLAG_NONE, entry.data(),
entry.size());
if (rv != 0) {
ULOG(ERROR, this) << "nghttp2_submit_settings() returned error: "
<< nghttp2_strerror(rv);
}
if (http2conf.upstream.connection_window_bits > 16) {
int32_t delta = (1 << http2conf.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);
}
}
// We wait for SETTINGS ACK at least 10 seconds.
ev_timer_init(&settings_timer_, settings_timeout_cb, 10., 0.);
settings_timer_.data = this;
// timer for 2nd GOAWAY. HTTP/2 spec recommend 1 RTT. We wait for
// 2 seconds.
ev_timer_init(&shutdown_timer_, shutdown_timeout_cb, 2., 0);
shutdown_timer_.data = this;
ev_prepare_init(&prep_, prepare_cb);
prep_.data = this;
ev_prepare_start(handler_->get_loop(), &prep_);
handler_->reset_upstream_read_timeout(
get_config()->conn.upstream.timeout.http2_read);
handler_->signal_write();
}
Http2Upstream::~Http2Upstream() {
nghttp2_session_del(session_);
ev_prepare_stop(handler_->get_loop(), &prep_);
ev_timer_stop(handler_->get_loop(), &shutdown_timer_);
ev_timer_stop(handler_->get_loop(), &settings_timer_);
}
int Http2Upstream::on_read() {
ssize_t rv = 0;
auto rb = handler_->get_rb();
auto rlimit = handler_->get_rlimit();
if (rb->rleft()) {
rv = nghttp2_session_mem_recv(session_, rb->pos, rb->rleft());
if (rv < 0) {
if (rv != NGHTTP2_ERR_BAD_CLIENT_MAGIC) {
ULOG(ERROR, this) << "nghttp2_session_recv() returned error: "
<< nghttp2_strerror(rv);
}
return -1;
}
// nghttp2_session_mem_recv should consume all input bytes on
// success.
assert(static_cast<size_t>(rv) == rb->rleft());
rb->reset();
rlimit->startw();
}
if (nghttp2_session_want_read(session_) == 0 &&
nghttp2_session_want_write(session_) == 0 && wb_.rleft() == 0) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "No more read/write for this HTTP2 session";
}
return -1;
}
handler_->signal_write();
return 0;
}
// After this function call, downstream may be deleted.
int Http2Upstream::on_write() {
for (;;) {
if (wb_.rleft() >= MAX_BUFFER_SIZE) {
return 0;
}
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;
}
wb_.append(data, datalen);
}
if (nghttp2_session_want_read(session_) == 0 &&
nghttp2_session_want_write(session_) == 0 && wb_.rleft() == 0) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "No more read/write for this HTTP2 session";
}
return -1;
}
return 0;
}
ClientHandler *Http2Upstream::get_client_handler() const { return handler_; }
int Http2Upstream::downstream_read(DownstreamConnection *dconn) {
auto downstream = dconn->get_downstream();
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.
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 if (downstream->get_response_state() == Downstream::MSG_BAD_HEADER) {
if (error_reply(downstream, 502) != 0) {
return -1;
}
downstream->pop_downstream_connection();
// dconn was deleted
dconn = nullptr;
} else {
auto rv = downstream->on_read();
if (rv == SHRPX_ERR_EOF) {
return downstream_eof(dconn);
}
if (rv == SHRPX_ERR_DCONN_CANCELED) {
downstream->pop_downstream_connection();
handler_->signal_write();
return 0;
}
if (rv != 0) {
if (rv != SHRPX_ERR_NETWORK) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "HTTP parser failure";
}
}
return downstream_error(dconn, Downstream::EVENT_ERROR);
}
if (downstream->can_detach_downstream_connection()) {
// Keep-alive
downstream->detach_downstream_connection();
}
}
handler_->signal_write();
// At this point, downstream may be deleted.
return 0;
}
int Http2Upstream::downstream_write(DownstreamConnection *dconn) {
int rv;
rv = dconn->on_write();
if (rv == SHRPX_ERR_NETWORK) {
return downstream_error(dconn, Downstream::EVENT_ERROR);
}
if (rv != 0) {
return -1;
}
return 0;
}
int Http2Upstream::downstream_eof(DownstreamConnection *dconn) {
auto downstream = dconn->get_downstream();
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "EOF. stream_id=" << downstream->get_stream_id();
}
// 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, this) << "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.
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 (error_reply(downstream, 502) != 0) {
return -1;
}
}
handler_->signal_write();
// At this point, downstream may be deleted.
return 0;
}
int Http2Upstream::downstream_error(DownstreamConnection *dconn, int events) {
auto downstream = dconn->get_downstream();
if (LOG_ENABLED(INFO)) {
if (events & Downstream::EVENT_ERROR) {
DCLOG(INFO, dconn) << "Downstream network/general error";
} else {
DCLOG(INFO, dconn) << "Timeout";
}
if (downstream->get_upgraded()) {
DCLOG(INFO, dconn) << "Note: this is tunnel connection";
}
}
// 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()) {
rst_stream(downstream, NGHTTP2_NO_ERROR);
}
} else {
if (downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
if (downstream->get_upgraded()) {
on_downstream_body_complete(downstream);
} else {
rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
}
} else {
unsigned int status;
if (events & Downstream::EVENT_TIMEOUT) {
status = 504;
} else {
status = 502;
}
if (error_reply(downstream, status) != 0) {
return -1;
}
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
}
handler_->signal_write();
// At this point, downstream may be deleted.
return 0;
}
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) {
int rv;
auto downstream = static_cast<Downstream *>(source->ptr);
auto body = downstream->get_response_buf();
assert(body);
const auto &resp = downstream->response();
auto nread = std::min(body->rleft(), length);
auto body_empty = body->rleft() == nread;
*data_flags |= NGHTTP2_DATA_FLAG_NO_COPY;
if (body_empty &&
downstream->get_response_state() == Downstream::MSG_COMPLETE) {
*data_flags |= NGHTTP2_DATA_FLAG_EOF;
if (!downstream->get_upgraded()) {
const auto &trailers = resp.fs.trailers();
if (!trailers.empty()) {
std::vector<nghttp2_nv> nva;
nva.reserve(trailers.size());
http2::copy_headers_to_nva_nocopy(nva, trailers);
if (!nva.empty()) {
rv = nghttp2_submit_trailer(session, stream_id, nva.data(),
nva.size());
if (rv != 0) {
if (nghttp2_is_fatal(rv)) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
} else {
*data_flags |= NGHTTP2_DATA_FLAG_NO_END_STREAM;
}
}
}
}
}
if (nread == 0 && ((*data_flags) & NGHTTP2_DATA_FLAG_EOF) == 0) {
return NGHTTP2_ERR_DEFERRED;
}
return nread;
}
} // namespace
int Http2Upstream::send_reply(Downstream *downstream, const uint8_t *body,
size_t bodylen) {
int rv;
nghttp2_data_provider data_prd, *data_prd_ptr = nullptr;
if (bodylen) {
data_prd.source.ptr = downstream;
data_prd.read_callback = downstream_data_read_callback;
data_prd_ptr = &data_prd;
}
const auto &resp = downstream->response();
auto &httpconf = get_config()->http;
const auto &headers = resp.fs.headers();
auto nva = std::vector<nghttp2_nv>();
// 2 for :status and server
nva.reserve(2 + headers.size() + httpconf.add_response_headers.size());
std::string status_code_str;
auto response_status_const = http2::stringify_status(resp.http_status);
if (response_status_const) {
nva.push_back(http2::make_nv_lc_nocopy(":status", response_status_const));
} else {
status_code_str = util::utos(resp.http_status);
nva.push_back(http2::make_nv_ls(":status", status_code_str));
}
for (auto &kv : headers) {
if (kv.name.empty() || kv.name[0] == ':') {
continue;
}
switch (kv.token) {
case http2::HD_CONNECTION:
case http2::HD_KEEP_ALIVE:
case http2::HD_PROXY_CONNECTION:
case http2::HD_TE:
case http2::HD_TRANSFER_ENCODING:
case http2::HD_UPGRADE:
continue;
}
nva.push_back(http2::make_nv_nocopy(kv.name, kv.value, kv.no_index));
}
if (!resp.fs.header(http2::HD_SERVER)) {
nva.push_back(
http2::make_nv_ls_nocopy("server", get_config()->http.server_name));
}
for (auto &p : httpconf.add_response_headers) {
nva.push_back(http2::make_nv_nocopy(p.name, p.value));
}
rv = nghttp2_submit_response(session_, downstream->get_stream_id(),
nva.data(), nva.size(), data_prd_ptr);
if (nghttp2_is_fatal(rv)) {
ULOG(FATAL, this) << "nghttp2_submit_response() failed: "
<< nghttp2_strerror(rv);
return -1;
}
auto buf = downstream->get_response_buf();
buf->append(body, bodylen);
downstream->set_response_state(Downstream::MSG_COMPLETE);
return 0;
}
int Http2Upstream::error_reply(Downstream *downstream,
unsigned int status_code) {
int rv;
auto &resp = downstream->response();
auto html = http::create_error_html(status_code);
resp.http_status = status_code;
auto body = downstream->get_response_buf();
body->append(html);
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 lgconf = log_config();
lgconf->update_tstamp(std::chrono::system_clock::now());
auto response_status_const = http2::stringify_status(status_code);
auto content_length = util::utos(html.size());
std::string status_code_str;
auto nva = make_array(
response_status_const
? http2::make_nv_lc_nocopy(":status", response_status_const)
: http2::make_nv_ls(":status",
(status_code_str = util::utos(status_code))),
http2::make_nv_ll("content-type", "text/html; charset=UTF-8"),
http2::make_nv_ls_nocopy("server", get_config()->http.server_name),
http2::make_nv_ls("content-length", content_length),
http2::make_nv_ls("date", lgconf->time_http_str));
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);
return -1;
}
return 0;
}
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);
}
nghttp2_session_set_stream_user_data(session_, downstream->get_stream_id(),
nullptr);
auto next_downstream = downstream_queue_.remove_and_get_blocked(downstream);
if (next_downstream) {
initiate_downstream(next_downstream);
}
}
// 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;
const auto &req = downstream->request();
auto &resp = downstream->response();
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";
}
}
auto &httpconf = get_config()->http;
if (!get_config()->http2_proxy && !get_config()->client_proxy &&
!httpconf.no_location_rewrite) {
downstream->rewrite_location_response_header(req.scheme);
}
#ifdef HAVE_MRUBY
if (!downstream->get_non_final_response()) {
auto worker = handler_->get_worker();
auto mruby_ctx = worker->get_mruby_context();
if (mruby_ctx->run_on_response_proc(downstream) != 0) {
if (error_reply(downstream, 500) != 0) {
return -1;
}
// Returning -1 will signal deletion of dconn.
return -1;
}
if (downstream->get_response_state() == Downstream::MSG_COMPLETE) {
return -1;
}
}
#endif // HAVE_MRUBY
auto nva = std::vector<nghttp2_nv>();
// 4 means :status and possible server, via and x-http2-push header
// field.
nva.reserve(resp.fs.headers().size() + 4 +
httpconf.add_response_headers.size());
std::string via_value;
std::string response_status;
auto response_status_const = http2::stringify_status(resp.http_status);
if (response_status_const) {
nva.push_back(http2::make_nv_lc_nocopy(":status", response_status_const));
} else {
response_status = util::utos(resp.http_status);
nva.push_back(http2::make_nv_ls(":status", response_status));
}
if (downstream->get_non_final_response()) {
http2::copy_headers_to_nva(nva, resp.fs.headers());
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);
resp.fs.clear_headers();
if (rv != 0) {
ULOG(FATAL, this) << "nghttp2_submit_headers() failed";
return -1;
}
return 0;
}
if (downstream->get_assoc_stream_id() != -1) {
rv = adjust_pushed_stream_priority(downstream);
if (rv != 0) {
return -1;
}
}
http2::copy_headers_to_nva_nocopy(nva, resp.fs.headers());
if (!get_config()->http2_proxy && !get_config()->client_proxy) {
nva.push_back(http2::make_nv_ls_nocopy("server", httpconf.server_name));
} else {
auto server = resp.fs.header(http2::HD_SERVER);
if (server) {
nva.push_back(http2::make_nv_ls_nocopy("server", (*server).value));
}
}
auto via = resp.fs.header(http2::HD_VIA);
if (httpconf.no_via) {
if (via) {
nva.push_back(http2::make_nv_ls_nocopy("via", (*via).value));
}
} else {
if (via) {
via_value = (*via).value;
via_value += ", ";
}
via_value +=
http::create_via_header_value(resp.http_major, resp.http_minor);
nva.push_back(http2::make_nv_ls("via", via_value));
}
for (auto &p : httpconf.add_response_headers) {
nva.push_back(http2::make_nv_nocopy(p.name, p.value));
}
if (downstream->get_stream_id() % 2 == 0) {
// This header field is basically for human on client side to
// figure out that the resource is pushed.
nva.push_back(http2::make_nv_ll("x-http2-push", "1"));
}
if (LOG_ENABLED(INFO)) {
log_response_headers(downstream, nva);
}
auto &http2conf = get_config()->http2;
if (http2conf.upstream.debug.dump.response_header) {
http2::dump_nv(http2conf.upstream.debug.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;
}
// We need some conditions that must be fulfilled to initiate server
// push.
//
// * Server push is disabled for http2 proxy or client proxy, since
// incoming headers are mixed origins. We don't know how to
// reliably determine the authority yet.
//
// * We need 200 response code for associated resource. This is too
// restrictive, we will review this later.
//
// * We requires GET or POST for associated resource. Probably we
// don't want to push for HEAD request. Not sure other methods
// are also eligible for push.
if (!http2conf.no_server_push &&
nghttp2_session_get_remote_settings(session_,
NGHTTP2_SETTINGS_ENABLE_PUSH) == 1 &&
!get_config()->http2_proxy && !get_config()->client_proxy &&
(downstream->get_stream_id() % 2) && resp.fs.header(http2::HD_LINK) &&
resp.http_status == 200 &&
(req.method == HTTP_GET || req.method == HTTP_POST)) {
if (prepare_push_promise(downstream) != 0) {
// Continue to send response even if push was failed.
}
}
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_buf();
body->append(data, len);
if (flush) {
nghttp2_session_resume_data(session_, downstream->get_stream_id());
downstream->ensure_upstream_wtimer();
}
return 0;
}
int Http2Upstream::adjust_pushed_stream_priority(Downstream *downstream) {
int rv;
// We only change pushed stream. The pushed stream has
// assoc_stream_id which is not -1.
auto assoc_stream_id = downstream->get_assoc_stream_id();
auto stream_id = downstream->get_stream_id();
auto assoc_stream = nghttp2_session_find_stream(session_, assoc_stream_id);
auto stream = nghttp2_session_find_stream(session_, stream_id);
// By default, downstream depends on assoc_stream. If its
// relationship is changed, then we don't change priority.
if (!assoc_stream || assoc_stream != nghttp2_stream_get_parent(stream)) {
return 0;
}
// We are going to make stream depend on dep_stream which is the
// parent stream of assoc_stream, if the content-type of stream
// indicates javascript or css.
auto dep_stream = nghttp2_stream_get_parent(assoc_stream);
if (!dep_stream) {
return 0;
}
const auto &resp = downstream->response();
auto ct = resp.fs.header(http2::HD_CONTENT_TYPE);
if (!ct) {
return 0;
}
if (!util::istarts_with_l(ct->value, "application/javascript") &&
!util::istarts_with_l(ct->value, "text/css") &&
// for polymer...
!util::istarts_with_l(ct->value, "text/html")) {
return 0;
}
auto dep_stream_id = nghttp2_stream_get_stream_id(dep_stream);
auto weight = nghttp2_stream_get_weight(assoc_stream);
nghttp2_priority_spec pri_spec;
nghttp2_priority_spec_init(&pri_spec, dep_stream_id, weight, 0);
rv = nghttp2_session_change_stream_priority(session_, stream_id, &pri_spec);
if (nghttp2_is_fatal(rv)) {
ULOG(FATAL, this) << "nghttp2_session_change_stream_priority() failed: "
<< nghttp2_strerror(rv);
return -1;
}
if (rv == 0) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "Changed pushed stream priority: pushed stream("
<< stream_id << ") now depends on stream("
<< dep_stream_id << ") with weight " << weight;
}
}
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";
}
auto &resp = downstream->response();
if (!downstream->validate_response_recv_body_length()) {
rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
resp.connection_close = true;
return 0;
}
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()) {
if (consume(downstream->get_stream_id(), consumed) != 0) {
return -1;
}
auto &req = downstream->request();
req.consume(consumed);
}
handler_->signal_write();
return 0;
}
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;
}
handler_->signal_write();
return 0;
}
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 << nv.name << TTY_RST << ": " << nv.value << "\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::on_handler_delete() {
for (auto d = downstream_queue_.get_downstreams(); d; d = d->dlnext) {
if (d->get_dispatch_state() == Downstream::DISPATCH_ACTIVE &&
d->accesslog_ready()) {
handler_->write_accesslog(d);
}
}
}
int Http2Upstream::on_downstream_reset(bool no_retry) {
int rv;
for (auto downstream = downstream_queue_.get_downstreams(); downstream;
downstream = downstream->dlnext) {
if (downstream->get_dispatch_state() != Downstream::DISPATCH_ACTIVE) {
continue;
}
if (!downstream->request_submission_ready()) {
// pushed stream is handled here
rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
downstream->pop_downstream_connection();
continue;
}
downstream->pop_downstream_connection();
downstream->add_retry();
if (no_retry || downstream->no_more_retry()) {
goto fail;
}
// downstream connection is clean; we can retry with new
// downstream connection.
rv = downstream->attach_downstream_connection(
handler_->get_downstream_connection(downstream));
if (rv != 0) {
goto fail;
}
continue;
fail:
if (on_downstream_abort_request(downstream, 503) != 0) {
return -1;
}
downstream->pop_downstream_connection();
}
handler_->signal_write();
return 0;
}
int Http2Upstream::prepare_push_promise(Downstream *downstream) {
int rv;
const char *base;
size_t baselen;
const auto &req = downstream->request();
const auto &resp = downstream->response();
rv = http2::get_pure_path_component(&base, &baselen, req.path);
if (rv != 0) {
return 0;
}
for (auto &kv : resp.fs.headers()) {
if (kv.token != http2::HD_LINK) {
continue;
}
for (auto &link :
http2::parse_link_header(kv.value.c_str(), kv.value.size())) {
auto uri = link.uri.first;
auto len = link.uri.second - link.uri.first;
const std::string *scheme_ptr, *authority_ptr;
std::string scheme, authority, path;
rv = http2::construct_push_component(scheme, authority, path, base,
baselen, uri, len);
if (rv != 0) {
continue;
}
if (scheme.empty()) {
scheme_ptr = &req.scheme;
} else {
scheme_ptr = &scheme;
}
if (authority.empty()) {
authority_ptr = &req.authority;
} else {
authority_ptr = &authority;
}
rv = submit_push_promise(*scheme_ptr, *authority_ptr, path, downstream);
if (rv != 0) {
return -1;
}
}
}
return 0;
}
int Http2Upstream::submit_push_promise(const std::string &scheme,
const std::string &authority,
const std::string &path,
Downstream *downstream) {
const auto &req = downstream->request();
std::vector<nghttp2_nv> nva;
// 4 for :method, :scheme, :path and :authority
nva.reserve(4 + req.fs.headers().size());
// juse use "GET" for now
nva.push_back(http2::make_nv_ll(":method", "GET"));
nva.push_back(http2::make_nv_ls(":scheme", scheme));
nva.push_back(http2::make_nv_ls(":path", path));
nva.push_back(http2::make_nv_ls(":authority", authority));
for (auto &kv : req.fs.headers()) {
switch (kv.token) {
// TODO generate referer
case http2::HD__AUTHORITY:
case http2::HD__SCHEME:
case http2::HD__METHOD:
case http2::HD__PATH:
continue;
case http2::HD_ACCEPT_ENCODING:
case http2::HD_ACCEPT_LANGUAGE:
case http2::HD_CACHE_CONTROL:
case http2::HD_HOST:
case http2::HD_USER_AGENT:
nva.push_back(http2::make_nv_nocopy(kv.name, kv.value, kv.no_index));
break;
}
}
auto promised_stream_id = nghttp2_submit_push_promise(
session_, NGHTTP2_FLAG_NONE, downstream->get_stream_id(), nva.data(),
nva.size(), nullptr);
if (promised_stream_id < 0) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "nghttp2_submit_push_promise() failed: "
<< nghttp2_strerror(promised_stream_id);
}
if (nghttp2_is_fatal(promised_stream_id)) {
return -1;
}
return 0;
}
if (LOG_ENABLED(INFO)) {
std::stringstream ss;
for (auto &nv : nva) {
ss << TTY_HTTP_HD << nv.name << TTY_RST << ": " << nv.value << "\n";
}
ULOG(INFO, this) << "HTTP push request headers. promised_stream_id="
<< promised_stream_id << "\n" << ss.str();
}
return 0;
}
bool Http2Upstream::push_enabled() const {
return !(get_config()->http2.no_server_push ||
nghttp2_session_get_remote_settings(
session_, NGHTTP2_SETTINGS_ENABLE_PUSH) == 0 ||
get_config()->http2_proxy || get_config()->client_proxy);
}
int Http2Upstream::initiate_push(Downstream *downstream, const char *uri,
size_t len) {
int rv;
if (len == 0 || !push_enabled() || (downstream->get_stream_id() % 2)) {
return 0;
}
const char *base;
size_t baselen;
const auto &req = downstream->request();
rv = http2::get_pure_path_component(&base, &baselen, req.path);
if (rv != 0) {
return -1;
}
const std::string *scheme_ptr, *authority_ptr;
std::string scheme, authority, path;
rv = http2::construct_push_component(scheme, authority, path, base, baselen,
uri, len);
if (rv != 0) {
return -1;
}
if (scheme.empty()) {
scheme_ptr = &req.scheme;
} else {
scheme_ptr = &scheme;
}
if (authority.empty()) {
authority_ptr = &req.authority;
} else {
authority_ptr = &authority;
}
rv = submit_push_promise(*scheme_ptr, *authority_ptr, path, downstream);
if (rv != 0) {
return -1;
}
return 0;
}
int Http2Upstream::response_riovec(struct iovec *iov, int iovcnt) const {
if (iovcnt == 0 || wb_.rleft() == 0) {
return 0;
}
return wb_.riovec(iov, iovcnt);
}
void Http2Upstream::response_drain(size_t n) { wb_.drain(n); }
bool Http2Upstream::response_empty() const { return wb_.rleft() == 0; }
DefaultMemchunks *Http2Upstream::get_response_buf() { return &wb_; }
Downstream *
Http2Upstream::on_downstream_push_promise(Downstream *downstream,
int32_t promised_stream_id) {
// promised_stream_id is for backend HTTP/2 session, not for
// frontend.
auto promised_downstream =
make_unique<Downstream>(this, handler_->get_mcpool(), 0);
auto &promised_req = promised_downstream->request();
promised_downstream->set_downstream_stream_id(promised_stream_id);
// Set associated stream in frontend
promised_downstream->set_assoc_stream_id(downstream->get_stream_id());
promised_downstream->disable_upstream_rtimer();
promised_req.http_major = 2;
promised_req.http_minor = 0;
auto ptr = promised_downstream.get();
add_pending_downstream(std::move(promised_downstream));
downstream_queue_.mark_active(ptr);
return ptr;
}
int Http2Upstream::on_downstream_push_promise_complete(
Downstream *downstream, Downstream *promised_downstream) {
std::vector<nghttp2_nv> nva;
const auto &promised_req = promised_downstream->request();
const auto &headers = promised_req.fs.headers();
nva.reserve(headers.size());
for (auto &kv : headers) {
nva.push_back(http2::make_nv_nocopy(kv.name, kv.value, kv.no_index));
}
auto promised_stream_id = nghttp2_submit_push_promise(
session_, NGHTTP2_FLAG_NONE, downstream->get_stream_id(), nva.data(),
nva.size(), promised_downstream);
if (promised_stream_id < 0) {
return -1;
}
promised_downstream->set_stream_id(promised_stream_id);
return 0;
}
void Http2Upstream::cancel_premature_downstream(
Downstream *promised_downstream) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "Remove premature promised stream "
<< promised_downstream;
}
downstream_queue_.remove_and_get_blocked(promised_downstream, false);
}
} // namespace shrpx
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