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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 "http2.h"
#include "util.h"
#include "base64.h"
#include "app_helper.h"
#include "template.h"
using namespace nghttp2;
namespace shrpx {
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;
}
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) {
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);
downstream->set_priority(0);
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()->upstream_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;
}
if (downstream->get_request_headers_sum() + namelen + valuelen >
get_config()->header_field_buffer ||
downstream->get_request_headers().size() >=
get_config()->max_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="
<< downstream->get_request_headers_sum() + namelen +
valuelen << ", num="
<< downstream->get_request_headers().size() + 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;
}
if (frame->headers.cat == NGHTTP2_HCAT_HEADERS) {
// just store header fields for trailer part
downstream->add_request_trailer(name, namelen, value, valuelen,
flags & NGHTTP2_NV_FLAG_NO_INDEX, -1);
return 0;
}
auto token = http2::lookup_token(name, namelen);
downstream->add_request_header(name, namelen, value, valuelen,
flags & NGHTTP2_NV_FLAG_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();
// TODO Use priority 0 for now
auto downstream = make_unique<Downstream>(upstream, handler->get_mcpool(),
frame->hd.stream_id, 0);
nghttp2_session_set_stream_user_data(session, frame->hd.stream_id,
downstream.get());
downstream->reset_upstream_rtimer();
// 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
int Http2Upstream::on_request_headers(Downstream *downstream,
const nghttp2_frame *frame) {
if (downstream->get_response_state() == Downstream::MSG_COMPLETE) {
return 0;
}
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, this) << "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);
}
auto content_length =
downstream->get_request_header(http2::HD_CONTENT_LENGTH);
if (content_length) {
// libnghttp2 guarantees this can be parsed
auto len = util::parse_uint(content_length->value);
downstream->set_request_content_length(len);
}
auto authority = downstream->get_request_header(http2::HD__AUTHORITY);
auto path = downstream->get_request_header(http2::HD__PATH);
auto method = downstream->get_request_header(http2::HD__METHOD);
auto scheme = downstream->get_request_header(http2::HD__SCHEME);
// presence of mandatory header fields are guaranteed by libnghttp2.
// For HTTP/2 proxy, we request :authority.
if (method->value != "CONNECT" && get_config()->http2_proxy && !authority) {
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);
}
start_downstream(downstream);
return 0;
}
void Http2Upstream::start_downstream(Downstream *downstream) {
if (downstream_queue_.can_activate(
downstream->get_request_http2_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());
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()->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 = 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()->upstream_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;
auto downstream = make_unique<Downstream>(upstream, handler->get_mcpool(),
promised_stream_id, 0);
nghttp2_session_set_stream_user_data(session, promised_stream_id,
downstream.get());
downstream->disable_upstream_rtimer();
downstream->set_request_major(2);
downstream->set_request_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:
downstream->set_request_method({nv.value, nv.value + nv.valuelen});
break;
case http2::HD__SCHEME:
downstream->set_request_http2_scheme(
{nv.value, nv.value + nv.valuelen});
break;
case http2::HD__AUTHORITY:
downstream->set_request_http2_authority(
{nv.value, nv.value + nv.valuelen});
break;
case http2::HD__PATH:
downstream->set_request_path({nv.value, nv.value + nv.valuelen});
break;
}
downstream->add_request_header(nv.name, nv.namelen, nv.value, nv.valuelen,
nv.flags & NGHTTP2_NV_FLAG_NO_INDEX,
token);
}
downstream->inspect_http2_request();
downstream->set_request_state(Downstream::MSG_COMPLETE);
// a bit weird but start_downstream() expects that given
// downstream is in pending queue.
auto ptr = downstream.get();
upstream->add_pending_downstream(std::move(downstream));
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 {
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);
if (get_config()->padding) {
nghttp2_session_callbacks_set_select_padding_callback(
callbacks, http::select_padding_callback);
}
return callbacks;
}
Http2Upstream::Http2Upstream(ClientHandler *handler)
: downstream_queue_(
get_config()->http2_proxy
? get_config()->downstream_connections_per_host
: get_config()->downstream_proto == PROTO_HTTP
? get_config()->downstream_connections_per_frontend
: 0,
!get_config()->http2_proxy),
handler_(handler), session_(nullptr), data_pending_(nullptr),
data_pendinglen_(0), shutdown_handled_(false) {
int rv;
rv = nghttp2_session_server_new2(&session_,
get_config()->http2_upstream_callbacks, this,
get_config()->http2_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 = 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.data(),
entry.size());
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);
}
}
// 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()->http2_upstream_read_timeout);
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();
}
auto wb = handler_->get_wb();
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() {
auto wb = handler_->get_wb();
if (data_pending_) {
auto n = std::min(wb->wleft(), data_pendinglen_);
wb->write(data_pending_, n);
if (n < data_pendinglen_) {
data_pending_ += n;
data_pendinglen_ -= n;
return 0;
}
data_pending_ = nullptr;
data_pendinglen_ = 0;
}
for (;;) {
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;
}
auto n = wb->write(data, datalen);
if (n < static_cast<decltype(n)>(datalen)) {
data_pending_ = data + n;
data_pendinglen_ = datalen - n;
return 0;
}
}
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_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.
remove_downstream(downstream);
// downstream was deleted
return 0;
}
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 != 0) {
if (rv != SHRPX_ERR_NETWORK) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "HTTP parser failure";
}
}
return downstream_error(dconn, Downstream::EVENT_ERROR);
}
// Detach downstream connection early so that it could be reused
// without hitting server's request timeout.
if (downstream->get_response_state() == Downstream::MSG_COMPLETE &&
!downstream->get_response_connection_close()) {
// 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();
}
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.
remove_downstream(downstream);
// downstream was deleted
return 0;
}
// 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";
}
}
if (downstream->get_request_state() == Downstream::STREAM_CLOSED) {
remove_downstream(downstream);
// downstream was deleted
return 0;
}
// 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 upstream = static_cast<Http2Upstream *>(downstream->get_upstream());
auto body = downstream->get_response_buf();
assert(body);
auto dconn = downstream->get_downstream_connection();
if (body->rleft() == 0 && dconn &&
downstream->get_response_state() != Downstream::MSG_COMPLETE) {
// Try to read more if buffer is empty. This will help small
// buffer and make priority handling a bit better.
if (upstream->downstream_read(dconn) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
}
auto nread = body->remove(buf, length);
auto body_empty = body->rleft() == 0;
if (body_empty &&
downstream->get_response_state() == Downstream::MSG_COMPLETE) {
*data_flags |= NGHTTP2_DATA_FLAG_EOF;
if (!downstream->get_upgraded()) {
auto &trailers = downstream->get_response_trailers();
if (!trailers.empty()) {
std::vector<nghttp2_nv> nva;
nva.reserve(trailers.size());
http2::copy_headers_to_nva(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 (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);
auto body = downstream->get_response_buf();
body->append(html.c_str(), html.size());
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 =
make_array(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);
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;
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";
}
}
if (!get_config()->http2_proxy && !get_config()->client_proxy &&
!get_config()->no_location_rewrite) {
downstream->rewrite_location_response_header(
downstream->get_request_http2_scheme());
}
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_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_response_header(http2::HD_SERVER);
if (server) {
nva.push_back(http2::make_nv_ls("server", (*server).value));
}
}
auto via = downstream->get_response_header(http2::HD_VIA);
if (get_config()->no_via) {
if (via) {
nva.push_back(http2::make_nv_ls("via", (*via).value));
}
} else {
if (via) {
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;
}
// We need some conditions that must be fulfilled to initiate server
// push.
//
// * Server push is disabled for http2 proxy, since incoming headers
// are mixed origins. We don't know how to reliably determine the
// authority yet.
//
// * If downstream is http/2, it is likely that PUSH_PROMISE is
// coming from there, so we don't initiate PUSH_RPOMISE here.
//
// * 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 (!get_config()->no_server_push &&
get_config()->downstream_proto == PROTO_HTTP &&
!get_config()->http2_proxy && (downstream->get_stream_id() % 2) &&
downstream->get_response_header(http2::HD_LINK) &&
downstream->get_response_http_status() == 200 &&
(downstream->get_request_method() == "GET" ||
downstream->get_request_method() == "POST")) {
if (prepare_push_promise(downstream) != 0) {
return -1;
}
}
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;
}
// 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";
}
if (!downstream->validate_response_bodylen()) {
rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
downstream->set_response_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()) {
assert(downstream->get_request_datalen() >= consumed);
if (consume(downstream->get_stream_id(), consumed) != 0) {
return -1;
}
downstream->dec_request_datalen(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()) {
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());
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;
http_parser_url u;
memset(&u, 0, sizeof(u));
rv = http_parser_parse_url(downstream->get_request_path().c_str(),
downstream->get_request_path().size(), 0, &u);
if (rv != 0) {
return 0;
}
const char *base;
size_t baselen;
if (u.field_set & (1 << UF_PATH)) {
auto &f = u.field_data[UF_PATH];
base = downstream->get_request_path().c_str() + f.off;
baselen = f.len;
} else {
base = "/";
baselen = 1;
}
for (auto &kv : downstream->get_response_headers()) {
if (kv.token != http2::HD_LINK) {
continue;
}
for (auto &link :
http2::parse_link_header(kv.value.c_str(), kv.value.size())) {
auto link_url = link.uri.first;
auto link_urllen = link.uri.second - link.uri.first;
const char *rel;
size_t rellen;
const char *relq = nullptr;
size_t relqlen = 0;
http_parser_url v;
memset(&v, 0, sizeof(v));
rv = http_parser_parse_url(link_url, link_urllen, 0, &v);
if (rv != 0) {
assert(link_urllen);
if (link_url[0] == '/') {
continue;
}
// treat link_url as relative URI.
auto end = std::find(link_url, link_url + link_urllen, '#');
auto q = std::find(link_url, end, '?');
rel = link_url;
rellen = q - link_url;
if (q != end) {
relq = q + 1;
relqlen = end - relq;
}
} else {
if (v.field_set & (1 << UF_HOST)) {
continue;
}
if (v.field_set & (1 << UF_PATH)) {
auto &f = v.field_data[UF_PATH];
rel = link_url + f.off;
rellen = f.len;
} else {
rel = "/";
rellen = 1;
}
if (v.field_set & (1 << UF_QUERY)) {
auto &f = v.field_data[UF_QUERY];
relq = link_url + f.off;
relqlen = f.len;
}
}
auto path = http2::path_join(base, baselen, nullptr, 0, rel, rellen, relq,
relqlen);
rv = submit_push_promise(path, downstream);
if (rv != 0) {
return -1;
}
}
}
return 0;
}
int Http2Upstream::submit_push_promise(const std::string &path,
Downstream *downstream) {
int rv;
std::vector<nghttp2_nv> nva;
nva.reserve(downstream->get_request_headers().size());
// juse use "GET" for now
nva.push_back(http2::make_nv_ll(":method", "GET"));
nva.push_back(
http2::make_nv_ls(":scheme", downstream->get_request_http2_scheme()));
nva.push_back(http2::make_nv_ls(":path", path));
auto &authority = downstream->get_request_http2_authority();
if (!authority.empty()) {
nva.push_back(http2::make_nv_ls(":authority", authority));
}
for (auto &kv : downstream->get_request_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(kv.name, kv.value, kv.no_index));
break;
}
}
rv = nghttp2_submit_push_promise(session_, NGHTTP2_FLAG_NONE,
downstream->get_stream_id(), nva.data(),
nva.size(), nullptr);
if (rv < 0) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "nghttp2_submit_push_promise() failed: "
<< nghttp2_strerror(rv);
}
if (nghttp2_is_fatal(rv)) {
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=" << rv
<< "\n" << ss.str();
}
return 0;
}
} // namespace shrpx
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