nghttp2/src/shrpx_http2_upstream.cc

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/*
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* nghttp2 - HTTP/2.0 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.
*/
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#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"
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#include "shrpx_downstream_connection.h"
#include "shrpx_config.h"
#include "shrpx_http.h"
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#include "shrpx_accesslog.h"
#include "http2.h"
#include "util.h"
#include "base64.h"
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using namespace nghttp2;
namespace shrpx {
namespace {
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const size_t SHRPX_SPDY_UPSTREAM_OUTPUT_UPPER_THRES = 64*1024;
} // namespace
namespace {
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ssize_t send_callback(nghttp2_session *session,
const uint8_t *data, size_t len, int flags,
void *user_data)
{
int rv;
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Http2Upstream *upstream = reinterpret_cast<Http2Upstream*>(user_data);
ClientHandler *handler = upstream->get_client_handler();
bufferevent *bev = handler->get_bev();
evbuffer *output = bufferevent_get_output(bev);
// Check buffer length and return WOULDBLOCK if it is large enough.
if(evbuffer_get_length(output) > SHRPX_SPDY_UPSTREAM_OUTPUT_UPPER_THRES) {
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return NGHTTP2_ERR_WOULDBLOCK;
}
rv = evbuffer_add(output, data, len);
if(rv == -1) {
ULOG(FATAL, upstream) << "evbuffer_add() failed";
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return NGHTTP2_ERR_CALLBACK_FAILURE;
} else {
return len;
}
}
} // namespace
namespace {
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ssize_t recv_callback(nghttp2_session *session,
uint8_t *data, size_t len, int flags, void *user_data)
{
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Http2Upstream *upstream = reinterpret_cast<Http2Upstream*>(user_data);
ClientHandler *handler = upstream->get_client_handler();
bufferevent *bev = handler->get_bev();
evbuffer *input = bufferevent_get_input(bev);
int nread = evbuffer_remove(input, data, len);
if(nread == -1) {
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return NGHTTP2_ERR_CALLBACK_FAILURE;
} else if(nread == 0) {
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return NGHTTP2_ERR_WOULDBLOCK;
} else {
return nread;
}
}
} // namespace
namespace {
void on_stream_close_callback
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(nghttp2_session *session, int32_t stream_id, nghttp2_error_code error_code,
void *user_data)
{
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Http2Upstream *upstream = reinterpret_cast<Http2Upstream*>(user_data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Stream stream_id=" << stream_id
<< " is being closed";
}
Downstream *downstream = upstream->find_downstream(stream_id);
if(downstream) {
if(downstream->get_request_state() == Downstream::CONNECT_FAIL) {
upstream->remove_downstream(downstream);
delete downstream;
} else {
downstream->set_request_state(Downstream::STREAM_CLOSED);
if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
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// At this point, downstream response was read
if(!downstream->get_upgraded() &&
!downstream->get_response_connection_close()) {
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// Keep-alive
DownstreamConnection *dconn;
dconn = downstream->get_downstream_connection();
if(dconn) {
dconn->detach_downstream(downstream);
}
}
upstream->remove_downstream(downstream);
delete downstream;
} else {
// At this point, downstream read may be paused.
// If shrpx_downstream::push_request_headers() failed, the
// error is handled here.
upstream->remove_downstream(downstream);
delete downstream;
// How to test this case? Request sufficient large download
// and make client send RST_STREAM after it gets first DATA
// frame chunk.
}
}
}
}
} // namespace
int Http2Upstream::upgrade_upstream(HttpsUpstream *http)
{
int rv;
std::string settings_payload;
auto downstream = http->get_downstream();
for(auto& hd : downstream->get_request_headers()) {
if(util::strieq(hd.first.c_str(), "http2-settings")) {
auto val = hd.second;
util::to_base64(val);
settings_payload = base64::decode(std::begin(val), std::end(val));
break;
}
}
rv = nghttp2_session_upgrade
(session_,
reinterpret_cast<const uint8_t*>(settings_payload.c_str()),
settings_payload.size(),
nullptr);
if(rv != 0) {
ULOG(WARNING, this) << "nghttp2_session_upgrade() returned error: "
<< nghttp2_strerror(rv);
return -1;
}
pre_upstream_ = http;
http->pop_downstream();
downstream->reset_upstream(this);
add_downstream(downstream);
downstream->init_response_body_buf();
downstream->set_stream_id(1);
downstream->set_priority(0);
return 0;
}
namespace {
int on_frame_recv_callback
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(nghttp2_session *session, nghttp2_frame *frame, void *user_data)
{
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auto upstream = reinterpret_cast<Http2Upstream*>(user_data);
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switch(frame->hd.type) {
case NGHTTP2_HEADERS: {
if(frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
break;
}
if(LOG_ENABLED(INFO)) {
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ULOG(INFO, upstream) << "Received upstream request HEADERS stream_id="
<< frame->hd.stream_id;
}
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auto downstream = new Downstream(upstream,
frame->hd.stream_id,
frame->headers.pri);
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upstream->add_downstream(downstream);
downstream->init_response_body_buf();
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auto nva = frame->headers.nva;
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auto nvlen = frame->headers.nvlen;
if(LOG_ENABLED(INFO)) {
std::stringstream ss;
for(size_t i = 0; i < frame->headers.nvlen; ++i) {
ss << TTY_HTTP_HD;
ss.write(reinterpret_cast<char*>(nva[i].name), nva[i].namelen);
ss << TTY_RST << ": ";
ss.write(reinterpret_cast<char*>(nva[i].value), nva[i].valuelen);
ss << "\n";
}
ULOG(INFO, upstream) << "HTTP request headers. stream_id="
<< downstream->get_stream_id()
<< "\n" << ss.str();
}
// Assuming that nva is sorted by name.
if(!http2::check_http2_headers(nva, nvlen)) {
upstream->rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
return 0;
}
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for(size_t i = 0; i < nvlen; ++i) {
if(nva[i].namelen > 0 && nva[i].name[0] != ':') {
downstream->add_request_header(http2::name_to_str(&nva[i]),
http2::value_to_str(&nva[i]));
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}
}
auto host = http2::get_unique_header(nva, nvlen, ":host");
auto path = http2::get_unique_header(nva, nvlen, ":path");
auto method = http2::get_unique_header(nva, nvlen, ":method");
auto scheme = http2::get_unique_header(nva, nvlen, ":scheme");
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bool is_connect = method &&
util::streq("CONNECT", method->value, method->valuelen);
if(!host || !path || !method ||
http2::value_lws(host) || http2::value_lws(path) ||
http2::value_lws(method) ||
(!is_connect && (!scheme || http2::value_lws(scheme)))) {
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upstream->rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
return 0;
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}
if(!is_connect &&
(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) == 0) {
auto content_length = http2::get_header(nva, nvlen, "content-length");
if(!content_length || http2::value_lws(content_length)) {
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// If content-length is missing,
// Downstream::push_upload_data_chunk will fail and
upstream->rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
return 0;
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}
}
downstream->set_request_method(http2::value_to_str(method));
// SpdyDownstreamConnection examines request path to find
// scheme. We construct abs URI for spdy_bridge mode as well as
// spdy_proxy mode.
if((get_config()->spdy_proxy || get_config()->spdy_bridge) &&
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scheme && path->value[0] == '/') {
std::string reqpath(http2::value_to_str(scheme));
reqpath += "://";
reqpath += http2::value_to_str(host);
reqpath += http2::value_to_str(path);
downstream->set_request_path(reqpath);
} else {
downstream->set_request_path(http2::value_to_str(path));
}
downstream->add_request_header("host", http2::value_to_str(host));
downstream->check_upgrade_request();
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auto dconn = upstream->get_client_handler()->get_downstream_connection();
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int rv = dconn->attach_downstream(downstream);
if(rv != 0) {
// If downstream connection fails, issue RST_STREAM.
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upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
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downstream->set_request_state(Downstream::CONNECT_FAIL);
return 0;
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}
rv = downstream->push_request_headers();
if(rv != 0) {
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upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
return 0;
}
downstream->set_request_state(Downstream::HEADER_COMPLETE);
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if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
break;
}
default:
break;
}
return 0;
}
} // namespace
namespace {
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void 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)
{
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Http2Upstream *upstream = reinterpret_cast<Http2Upstream*>(user_data);
Downstream *downstream = upstream->find_downstream(stream_id);
if(downstream) {
if(downstream->push_upload_data_chunk(data, len) != 0) {
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upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
return;
}
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if(upstream->get_flow_control()) {
downstream->inc_recv_window_size(len);
// In case that user specified initial window size is smaller
// than default one and avoid stream tear down for the first
// request due to race condition, we allow at least default
// initial window size.
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if(downstream->get_recv_window_size() >
std::max(NGHTTP2_INITIAL_WINDOW_SIZE,
upstream->get_initial_window_size())) {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Flow control error: recv_window_size="
<< downstream->get_recv_window_size()
<< ", initial_window_size="
<< upstream->get_initial_window_size();
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}
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upstream->rst_stream(downstream, NGHTTP2_FLOW_CONTROL_ERROR);
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return;
}
}
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if(flags & NGHTTP2_FLAG_END_STREAM) {
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
}
}
} // namespace
namespace {
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void on_frame_not_send_callback(nghttp2_session *session,
nghttp2_frame *frame,
int lib_error_code, void *user_data)
{
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auto upstream = reinterpret_cast<Http2Upstream*>(user_data);
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ULOG(WARNING, upstream) << "Failed to send control frame type="
<< static_cast<uint32_t>(frame->hd.type)
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<< ", lib_error_code=" << lib_error_code << ":"
<< nghttp2_strerror(lib_error_code);
if(frame->hd.type == NGHTTP2_HEADERS &&
frame->headers.cat == NGHTTP2_HCAT_RESPONSE) {
// To avoid stream hanging around, issue RST_STREAM.
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auto downstream = upstream->find_downstream(frame->hd.stream_id);
if(downstream) {
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upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
}
}
}
} // namespace
namespace {
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void on_frame_recv_parse_error_callback(nghttp2_session *session,
nghttp2_frame_type type,
const uint8_t *head, size_t headlen,
const uint8_t *payload,
size_t payloadlen, int lib_error_code,
void *user_data)
{
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auto upstream = reinterpret_cast<Http2Upstream*>(user_data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Failed to parse received control frame. type="
<< type
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<< ", error_code=" << lib_error_code << ":"
<< nghttp2_strerror(lib_error_code);
}
}
} // namespace
namespace {
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void on_unknown_frame_recv_callback(nghttp2_session *session,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
void *user_data)
{
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auto upstream = reinterpret_cast<Http2Upstream*>(user_data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Received unknown control frame.";
}
}
} // namespace
namespace {
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nghttp2_error_code infer_upstream_rst_stream_error_code
(nghttp2_error_code downstream_error_code)
{
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// Only propagate NGHTTP2_REFUSED_STREAM so that upstream client
// can resend request.
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if(downstream_error_code != NGHTTP2_REFUSED_STREAM) {
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return NGHTTP2_INTERNAL_ERROR;
} else {
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return downstream_error_code;
}
}
} // namespace
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Http2Upstream::Http2Upstream(ClientHandler *handler)
: handler_(handler),
session_(nullptr),
pre_upstream_(nullptr)
{
//handler->set_bev_cb(spdy_readcb, 0, spdy_eventcb);
handler->set_upstream_timeouts(&get_config()->spdy_upstream_read_timeout,
&get_config()->upstream_write_timeout);
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nghttp2_session_callbacks callbacks;
memset(&callbacks, 0, sizeof(callbacks));
callbacks.send_callback = send_callback;
callbacks.recv_callback = recv_callback;
callbacks.on_stream_close_callback = on_stream_close_callback;
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callbacks.on_frame_recv_callback = on_frame_recv_callback;
callbacks.on_data_chunk_recv_callback = on_data_chunk_recv_callback;
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callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
callbacks.on_frame_recv_parse_error_callback =
on_frame_recv_parse_error_callback;
callbacks.on_unknown_frame_recv_callback = on_unknown_frame_recv_callback;
int rv;
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rv = nghttp2_session_server_new(&session_, &callbacks, this);
assert(rv == 0);
int val = 1;
flow_control_ = true;
initial_window_size_ = (1 << get_config()->spdy_upstream_window_bits) - 1;
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rv = nghttp2_session_set_option(session_,
NGHTTP2_OPT_NO_AUTO_STREAM_WINDOW_UPDATE,
&val, sizeof(val));
assert(rv == 0);
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// TODO Maybe call from outside?
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nghttp2_settings_entry entry[2];
entry[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
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entry[0].value = get_config()->spdy_max_concurrent_streams;
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entry[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
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entry[1].value = initial_window_size_;
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rv = nghttp2_submit_settings
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(session_, entry, sizeof(entry)/sizeof(nghttp2_settings_entry));
assert(rv == 0);
// Set large connection-level window size to effectively disable
// connection-level flow control.
rv = nghttp2_submit_window_update(session_, NGHTTP2_FLAG_NONE,
0, 1000000007);
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assert(rv == 0);
}
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Http2Upstream::~Http2Upstream()
{
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nghttp2_session_del(session_);
delete pre_upstream_;
}
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int Http2Upstream::on_read()
{
int rv = 0;
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if((rv = nghttp2_session_recv(session_)) < 0) {
if(rv != NGHTTP2_ERR_EOF) {
ULOG(ERROR, this) << "nghttp2_session_recv() returned error: "
<< nghttp2_strerror(rv);
}
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} else if((rv = nghttp2_session_send(session_)) < 0) {
ULOG(ERROR, this) << "nghttp2_session_send() returned error: "
<< nghttp2_strerror(rv);
}
if(rv == 0) {
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if(nghttp2_session_want_read(session_) == 0 &&
nghttp2_session_want_write(session_) == 0 &&
evbuffer_get_length(bufferevent_get_output(handler_->get_bev())) == 0) {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "No more read/write for this SPDY session";
}
rv = -1;
}
}
return rv;
}
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int Http2Upstream::on_write()
{
return send();
}
// After this function call, downstream may be deleted.
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int Http2Upstream::send()
{
int rv = 0;
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if((rv = nghttp2_session_send(session_)) < 0) {
ULOG(ERROR, this) << "nghttp2_session_send() returned error: "
<< nghttp2_strerror(rv);
}
if(rv == 0) {
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if(nghttp2_session_want_read(session_) == 0 &&
nghttp2_session_want_write(session_) == 0 &&
evbuffer_get_length(bufferevent_get_output(handler_->get_bev())) == 0) {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "No more read/write for this SPDY session";
}
rv = -1;
}
}
return rv;
}
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int Http2Upstream::on_event()
{
return 0;
}
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ClientHandler* Http2Upstream::get_client_handler() const
{
return handler_;
}
namespace {
void spdy_downstream_readcb(bufferevent *bev, void *ptr)
{
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DownstreamConnection *dconn = reinterpret_cast<DownstreamConnection*>(ptr);
Downstream *downstream = dconn->get_downstream();
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Http2Upstream *upstream;
upstream = static_cast<Http2Upstream*>(downstream->get_upstream());
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
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// If upstream SPDY stream was closed, we just close downstream,
// because there is no consumer now. Downstream connection is also
// closed in this case.
upstream->remove_downstream(downstream);
delete downstream;
return;
}
if(downstream->get_response_state() == Downstream::MSG_RESET) {
// The downstream stream was reset (canceled). In this case,
// RST_STREAM to the upstream and delete downstream connection
// here. Deleting downstream will be taken place at
// on_stream_close_callback.
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upstream->rst_stream(downstream, infer_upstream_rst_stream_error_code
(downstream->get_response_rst_stream_error_code()));
downstream->set_downstream_connection(0);
delete dconn;
dconn = 0;
} else {
int rv = downstream->on_read();
if(rv != 0) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "HTTP parser failure";
}
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
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upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
} else if(downstream->get_response_state() != Downstream::MSG_COMPLETE) {
// If response was completed, then don't issue RST_STREAM
if(upstream->error_reply(downstream, 502) != 0) {
delete upstream->get_client_handler();
return;
}
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
// Clearly, we have to close downstream connection on http parser
// failure.
downstream->set_downstream_connection(0);
delete dconn;
dconn = 0;
}
}
if(upstream->send() != 0) {
delete upstream->get_client_handler();
return;
}
// At this point, downstream may be deleted.
}
} // namespace
namespace {
void spdy_downstream_writecb(bufferevent *bev, void *ptr)
{
if(evbuffer_get_length(bufferevent_get_output(bev)) > 0) {
return;
}
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DownstreamConnection *dconn = reinterpret_cast<DownstreamConnection*>(ptr);
Downstream *downstream = dconn->get_downstream();
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Http2Upstream *upstream;
upstream = static_cast<Http2Upstream*>(downstream->get_upstream());
upstream->resume_read(SHRPX_NO_BUFFER, downstream);
}
} // namespace
namespace {
void spdy_downstream_eventcb(bufferevent *bev, short events, void *ptr)
{
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DownstreamConnection *dconn = reinterpret_cast<DownstreamConnection*>(ptr);
Downstream *downstream = dconn->get_downstream();
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Http2Upstream *upstream;
upstream = static_cast<Http2Upstream*>(downstream->get_upstream());
if(events & BEV_EVENT_CONNECTED) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Connection established. stream_id="
<< downstream->get_stream_id();
}
int fd = bufferevent_getfd(bev);
int val = 1;
if(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
reinterpret_cast<char *>(&val), sizeof(val)) == -1) {
DCLOG(WARNING, dconn) << "Setting option TCP_NODELAY failed: errno="
<< errno;
}
} else if(events & BEV_EVENT_EOF) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "EOF. stream_id=" << downstream->get_stream_id();
}
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
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// If stream was closed already, we don't need to send reply at
// the first place. We can delete downstream.
upstream->remove_downstream(downstream);
delete downstream;
} else {
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// Delete downstream connection. If we don't delete it here, it
// will be pooled in on_stream_close_callback.
downstream->set_downstream_connection(0);
delete dconn;
dconn = 0;
// downstream wil be deleted in on_stream_close_callback.
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
// Server may indicate the end of the request by EOF
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Downstream body was ended by EOF";
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
// For tunneled connection, MSG_COMPLETE signals
// spdy_data_read_callback to send RST_STREAM after pending
// response body is sent. This is needed to ensure that
// RST_STREAM is sent after all pending data are sent.
upstream->on_downstream_body_complete(downstream);
} else if(downstream->get_response_state() != Downstream::MSG_COMPLETE) {
// If stream was not closed, then we set MSG_COMPLETE and let
// on_stream_close_callback delete downstream.
if(upstream->error_reply(downstream, 502) != 0) {
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delete upstream->get_client_handler();
return;
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
}
if(upstream->send() != 0) {
delete upstream->get_client_handler();
return;
}
// At this point, downstream may be deleted.
}
} else if(events & (BEV_EVENT_ERROR | BEV_EVENT_TIMEOUT)) {
if(LOG_ENABLED(INFO)) {
if(events & BEV_EVENT_ERROR) {
DCLOG(INFO, dconn) << "Downstream network error: "
<< evutil_socket_error_to_string
(EVUTIL_SOCKET_ERROR());
} else {
DCLOG(INFO, dconn) << "Timeout";
}
if(downstream->get_upgraded()) {
DCLOG(INFO, dconn) << "Note: this is tunnel connection";
}
}
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
upstream->remove_downstream(downstream);
delete downstream;
} else {
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// Delete downstream connection. If we don't delete it here, it
// will be pooled in on_stream_close_callback.
downstream->set_downstream_connection(0);
delete dconn;
dconn = 0;
if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
// For SSL tunneling, we issue RST_STREAM. For other types of
// stream, we don't have to do anything since response was
// complete.
if(downstream->get_upgraded()) {
upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
}
} else {
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
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upstream->rst_stream(downstream, NGHTTP2_INTERNAL_ERROR);
} else {
int status;
if(events & BEV_EVENT_TIMEOUT) {
status = 504;
} else {
status = 502;
}
if(upstream->error_reply(downstream, status) != 0) {
delete upstream->get_client_handler();
return;
}
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
}
if(upstream->send() != 0) {
delete upstream->get_client_handler();
return;
}
// At this point, downstream may be deleted.
}
}
}
} // namespace
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int Http2Upstream::rst_stream(Downstream *downstream,
nghttp2_error_code error_code)
{
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "RST_STREAM stream_id="
<< downstream->get_stream_id();
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}
int rv;
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rv = nghttp2_submit_rst_stream(session_, downstream->get_stream_id(),
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error_code);
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if(rv < NGHTTP2_ERR_FATAL) {
ULOG(FATAL, this) << "nghttp2_submit_rst_stream() failed: "
<< nghttp2_strerror(rv);
DIE();
}
return 0;
}
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int Http2Upstream::window_update(Downstream *downstream)
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{
int rv;
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rv = nghttp2_submit_window_update(session_, NGHTTP2_FLAG_NONE,
downstream->get_stream_id(),
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downstream->get_recv_window_size());
downstream->set_recv_window_size(0);
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if(rv < NGHTTP2_ERR_FATAL) {
ULOG(FATAL, this) << "nghttp2_submit_window_update() failed: "
<< nghttp2_strerror(rv);
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DIE();
}
return 0;
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}
namespace {
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ssize_t spdy_data_read_callback(nghttp2_session *session,
int32_t stream_id,
uint8_t *buf, size_t length,
int *eof,
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nghttp2_data_source *source,
void *user_data)
{
Downstream *downstream = reinterpret_cast<Downstream*>(source->ptr);
evbuffer *body = downstream->get_response_body_buf();
assert(body);
int nread = evbuffer_remove(body, buf, length);
if(nread == 0 &&
downstream->get_response_state() == Downstream::MSG_COMPLETE) {
if(!downstream->get_upgraded()) {
*eof = 1;
} else {
// For tunneling, issue RST_STREAM to finish the stream.
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Http2Upstream *upstream;
upstream = reinterpret_cast<Http2Upstream*>(downstream->get_upstream());
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "RST_STREAM to tunneled stream stream_id="
<< stream_id;
}
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upstream->rst_stream(downstream, infer_upstream_rst_stream_error_code
(downstream->get_response_rst_stream_error_code()));
}
}
if(nread == 0 && *eof != 1) {
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return NGHTTP2_ERR_DEFERRED;
}
return nread;
}
} // namespace
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int Http2Upstream::error_reply(Downstream *downstream, int status_code)
{
int rv;
std::string html = http::create_error_html(status_code);
downstream->init_response_body_buf();
evbuffer *body = downstream->get_response_body_buf();
rv = evbuffer_add(body, html.c_str(), html.size());
if(rv == -1) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
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nghttp2_data_provider data_prd;
data_prd.source.ptr = downstream;
data_prd.read_callback = spdy_data_read_callback;
std::string content_length = util::utos(html.size());
std::string status_code_str = std::to_string(status_code);
const char *nv[] = {
":status", status_code_str.c_str(),
"content-type", "text/html; charset=UTF-8",
"server", get_config()->server_name,
"content-length", content_length.c_str(),
0
};
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rv = nghttp2_submit_response(session_, downstream->get_stream_id(), nv,
&data_prd);
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if(rv < NGHTTP2_ERR_FATAL) {
ULOG(FATAL, this) << "nghttp2_submit_response() failed: "
<< nghttp2_strerror(rv);
DIE();
}
if(get_config()->accesslog) {
upstream_response(get_client_handler()->get_ipaddr(),
status_code, downstream);
}
return 0;
}
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bufferevent_data_cb Http2Upstream::get_downstream_readcb()
{
return spdy_downstream_readcb;
}
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bufferevent_data_cb Http2Upstream::get_downstream_writecb()
{
return spdy_downstream_writecb;
}
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bufferevent_event_cb Http2Upstream::get_downstream_eventcb()
{
return spdy_downstream_eventcb;
}
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void Http2Upstream::add_downstream(Downstream *downstream)
{
downstream_queue_.add(downstream);
}
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void Http2Upstream::remove_downstream(Downstream *downstream)
{
downstream_queue_.remove(downstream);
}
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Downstream* Http2Upstream::find_downstream(int32_t stream_id)
{
return downstream_queue_.find(stream_id);
}
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nghttp2_session* Http2Upstream::get_spdy_session()
{
return session_;
}
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// WARNING: Never call directly or indirectly nghttp2_session_send or
// nghttp2_session_recv. These calls may delete downstream.
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int Http2Upstream::on_downstream_header_complete(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "HTTP response header completed";
}
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downstream->normalize_response_headers();
auto end_headers = std::end(downstream->get_response_headers());
size_t nheader = downstream->get_response_headers().size();
// 4 means :status and possible via header field.
const char **nv = new const char*[nheader * 2 + 4 + 1];
size_t hdidx = 0;
std::string via_value;
std::string response_status =
std::to_string(downstream->get_response_http_status());
nv[hdidx++] = ":status";
nv[hdidx++] = response_status.c_str();
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hdidx += http2::copy_norm_headers_to_nv(&nv[hdidx],
downstream->get_response_headers());
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auto via = downstream->get_norm_response_header("via");
if(get_config()->no_via) {
if(via != end_headers) {
nv[hdidx++] = "via";
nv[hdidx++] = (*via).second.c_str();
}
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} else {
if(via != end_headers) {
via_value = (*via).second;
via_value += ", ";
}
via_value += http::create_via_header_value
(downstream->get_response_major(), downstream->get_response_minor());
nv[hdidx++] = "via";
nv[hdidx++] = via_value.c_str();
}
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nv[hdidx++] = nullptr;
if(LOG_ENABLED(INFO)) {
std::stringstream ss;
for(size_t i = 0; nv[i]; i += 2) {
ss << TTY_HTTP_HD << nv[i] << TTY_RST << ": " << nv[i+1] << "\n";
}
ULOG(INFO, this) << "HTTP response headers. stream_id="
<< downstream->get_stream_id() << "\n"
<< ss.str();
}
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nghttp2_data_provider data_prd;
data_prd.source.ptr = downstream;
data_prd.read_callback = spdy_data_read_callback;
int rv;
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rv = nghttp2_submit_response(session_, downstream->get_stream_id(), nv,
&data_prd);
delete [] nv;
if(rv != 0) {
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ULOG(FATAL, this) << "nghttp2_submit_response() failed";
return -1;
}
if(get_config()->accesslog) {
upstream_response(get_client_handler()->get_ipaddr(),
downstream->get_response_http_status(),
downstream);
}
return 0;
}
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// WARNING: Never call directly or indirectly nghttp2_session_send or
// nghttp2_session_recv. These calls may delete downstream.
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int Http2Upstream::on_downstream_body(Downstream *downstream,
const uint8_t *data, size_t len)
{
evbuffer *body = downstream->get_response_body_buf();
int rv = evbuffer_add(body, data, len);
if(rv != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
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nghttp2_session_resume_data(session_, downstream->get_stream_id());
size_t bodylen = evbuffer_get_length(body);
if(bodylen > SHRPX_SPDY_UPSTREAM_OUTPUT_UPPER_THRES) {
downstream->pause_read(SHRPX_NO_BUFFER);
}
return 0;
}
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// WARNING: Never call directly or indirectly nghttp2_session_send or
// nghttp2_session_recv. These calls may delete downstream.
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int Http2Upstream::on_downstream_body_complete(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "HTTP response completed";
}
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nghttp2_session_resume_data(session_, downstream->get_stream_id());
return 0;
}
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bool Http2Upstream::get_flow_control() const
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{
return flow_control_;
}
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int32_t Http2Upstream::get_initial_window_size() const
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{
return initial_window_size_;
}
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void Http2Upstream::pause_read(IOCtrlReason reason)
{}
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int Http2Upstream::resume_read(IOCtrlReason reason, Downstream *downstream)
{
if(get_flow_control()) {
if(downstream->get_recv_window_size() >= get_initial_window_size()/2) {
window_update(downstream);
}
}
return send();
}
} // namespace shrpx