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nghttp2/src/shrpx_spdy_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_spdy_upstream.h"
#include <netinet/tcp.h>
#include <assert.h>
#include <cerrno>
#include <sstream>
#include <nghttp2/nghttp2.h>
#include "shrpx_client_handler.h"
#include "shrpx_downstream.h"
#include "shrpx_downstream_connection.h"
#include "shrpx_config.h"
#include "shrpx_http.h"
#include "shrpx_accesslog.h"
#include "http2.h"
#include "util.h"
using namespace nghttp2;
namespace shrpx {
namespace {
const size_t OUTBUF_MAX_THRES = 16*1024;
const size_t INBUF_MAX_THRES = 16*1024;
} // namespace
namespace {
ssize_t send_callback(spdylay_session *session,
const uint8_t *data, size_t len, int flags,
void *user_data)
{
int rv;
auto upstream = static_cast<SpdyUpstream*>(user_data);
auto handler = upstream->get_client_handler();
// Check buffer length and return WOULDBLOCK if it is large enough.
if(handler->get_outbuf_length() + upstream->sendbuf.get_buflen() >=
OUTBUF_MAX_THRES) {
return SPDYLAY_ERR_WOULDBLOCK;
}
rv = upstream->sendbuf.add(data, len);
if(rv != 0) {
ULOG(FATAL, upstream) << "evbuffer_add() failed";
return SPDYLAY_ERR_CALLBACK_FAILURE;
}
return len;
}
} // namespace
namespace {
ssize_t recv_callback(spdylay_session *session,
uint8_t *data, size_t len, int flags, void *user_data)
{
auto upstream = static_cast<SpdyUpstream*>(user_data);
auto handler = upstream->get_client_handler();
auto bev = handler->get_bev();
auto input = bufferevent_get_input(bev);
int nread = evbuffer_remove(input, data, len);
if(nread == -1) {
return SPDYLAY_ERR_CALLBACK_FAILURE;
} else if(nread == 0) {
return SPDYLAY_ERR_WOULDBLOCK;
} else {
return nread;
}
}
} // namespace
namespace {
void on_stream_close_callback
(spdylay_session *session, int32_t stream_id, spdylay_status_code status_code,
void *user_data)
{
auto upstream = static_cast<SpdyUpstream*>(user_data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Stream stream_id=" << stream_id
<< " is being closed";
}
auto downstream = upstream->find_downstream(stream_id);
if(!downstream) {
return;
}
if(downstream->get_request_state() == Downstream::CONNECT_FAIL) {
upstream->remove_downstream(downstream);
delete downstream;
return;
}
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
auto dconn = downstream->get_downstream_connection();
if(dconn) {
dconn->detach_downstream(downstream);
}
}
upstream->remove_downstream(downstream);
delete downstream;
return;
}
// 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
namespace {
void on_ctrl_recv_callback
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data)
{
auto upstream = static_cast<SpdyUpstream*>(user_data);
switch(type) {
case SPDYLAY_SYN_STREAM: {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Received upstream SYN_STREAM stream_id="
<< frame->syn_stream.stream_id;
}
auto downstream = new Downstream(upstream,
frame->syn_stream.stream_id,
frame->syn_stream.pri);
upstream->add_downstream(downstream);
downstream->init_response_body_buf();
auto nv = frame->syn_stream.nv;
const char *path = nullptr;
const char *scheme = nullptr;
const char *host = nullptr;
const char *method = nullptr;
const char *content_length = 0;
for(size_t i = 0; nv[i]; i += 2) {
if(strcmp(nv[i], ":path") == 0) {
path = nv[i+1];
} else if(strcmp(nv[i], ":scheme") == 0) {
scheme = nv[i+1];
} else if(strcmp(nv[i], ":method") == 0) {
method = nv[i+1];
} else if(strcmp(nv[i], ":host") == 0) {
host = nv[i+1];
} else if(nv[i][0] != ':') {
if(strcmp(nv[i], "content-length") == 0) {
content_length = nv[i+1];
}
downstream->add_request_header(nv[i], nv[i+1]);
}
}
bool is_connect = method && strcmp("CONNECT", method) == 0;
if(!path || !host || !method ||
http2::lws(host) || http2::lws(path) || http2::lws(method) ||
(!is_connect && (!scheme || http2::lws(scheme)))) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
return;
}
// Require content-length if FIN flag is not set.
if(!is_connect && !content_length &&
(frame->syn_stream.hd.flags & SPDYLAY_CTRL_FLAG_FIN) == 0) {
upstream->rst_stream(downstream, SPDYLAY_PROTOCOL_ERROR);
return;
}
downstream->set_request_method(method);
if(is_connect) {
downstream->set_request_http2_authority(path);
} else {
downstream->set_request_http2_scheme(scheme);
downstream->set_request_http2_authority(host);
downstream->set_request_path(path);
}
downstream->inspect_http2_request();
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, upstream) << "HTTP request headers. stream_id="
<< downstream->get_stream_id()
<< "\n" << ss.str();
}
auto dconn = upstream->get_client_handler()->get_downstream_connection();
int rv = dconn->attach_downstream(downstream);
if(rv != 0) {
// If downstream connection fails, issue RST_STREAM.
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
downstream->set_request_state(Downstream::CONNECT_FAIL);
return;
}
rv = downstream->push_request_headers();
if(rv != 0) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
return;
}
downstream->set_request_state(Downstream::HEADER_COMPLETE);
if(frame->syn_stream.hd.flags & SPDYLAY_CTRL_FLAG_FIN) {
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
break;
}
default:
break;
}
}
} // namespace
namespace {
void on_data_chunk_recv_callback(spdylay_session *session,
uint8_t flags, int32_t stream_id,
const uint8_t *data, size_t len,
void *user_data)
{
auto upstream = static_cast<SpdyUpstream*>(user_data);
auto downstream = upstream->find_downstream(stream_id);
if(!downstream) {
upstream->handle_ign_data_chunk(len);
return;
}
if(downstream->push_upload_data_chunk(data, len) != 0) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
upstream->handle_ign_data_chunk(len);
return;
}
if(!upstream->get_flow_control()) {
return;
}
// If connection-level window control is not enabled (e.g,
// spdy/3), spdylay_session_get_recv_data_length() is always
// returns 0.
if(spdylay_session_get_recv_data_length(session) >
std::max(SPDYLAY_INITIAL_WINDOW_SIZE,
1 << get_config()->http2_upstream_connection_window_bits)) {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream)
<< "Flow control error on connection: "
<< "recv_window_size="
<< spdylay_session_get_recv_data_length(session)
<< ", window_size="
<< (1 << get_config()->http2_upstream_connection_window_bits);
}
spdylay_session_fail_session(session, SPDYLAY_GOAWAY_PROTOCOL_ERROR);
return;
}
if(spdylay_session_get_stream_recv_data_length(session, stream_id) >
std::max(SPDYLAY_INITIAL_WINDOW_SIZE,
1 << get_config()->http2_upstream_window_bits)) {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream)
<< "Flow control error: recv_window_size="
<< spdylay_session_get_stream_recv_data_length(session, stream_id)
<< ", initial_window_size="
<< (1 << get_config()->http2_upstream_window_bits);
}
upstream->rst_stream(downstream, SPDYLAY_FLOW_CONTROL_ERROR);
return;
}
}
} // namespace
namespace {
void on_data_recv_callback(spdylay_session *session, uint8_t flags,
int32_t stream_id, int32_t length, void *user_data)
{
auto upstream = static_cast<SpdyUpstream*>(user_data);
auto downstream = upstream->find_downstream(stream_id);
if(downstream && (flags & SPDYLAY_DATA_FLAG_FIN)) {
downstream->end_upload_data();
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
}
} // namespace
namespace {
void on_ctrl_not_send_callback(spdylay_session *session,
spdylay_frame_type type,
spdylay_frame *frame,
int error_code, void *user_data)
{
auto upstream = static_cast<SpdyUpstream*>(user_data);
ULOG(WARNING, upstream) << "Failed to send control frame type=" << type
<< ", error_code=" << error_code << ":"
<< spdylay_strerror(error_code);
if(type == SPDYLAY_SYN_REPLY) {
// To avoid stream hanging around, issue RST_STREAM.
auto stream_id = frame->syn_reply.stream_id;
auto downstream = upstream->find_downstream(stream_id);
if(downstream) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
}
}
}
} // namespace
namespace {
void on_ctrl_recv_parse_error_callback(spdylay_session *session,
spdylay_frame_type type,
const uint8_t *head, size_t headlen,
const uint8_t *payload,
size_t payloadlen, int error_code,
void *user_data)
{
auto upstream = static_cast<SpdyUpstream*>(user_data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Failed to parse received control frame. type="
<< type
<< ", error_code=" << error_code << ":"
<< spdylay_strerror(error_code);
}
}
} // namespace
namespace {
void on_unknown_ctrl_recv_callback(spdylay_session *session,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
void *user_data)
{
auto upstream = static_cast<SpdyUpstream*>(user_data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Received unknown control frame.";
}
}
} // namespace
namespace {
// Infer upstream RST_STREAM status code from downstream HTTP/2
// error code.
uint32_t infer_upstream_rst_stream_status_code
(nghttp2_error_code downstream_error_code)
{
// Only propagate *_REFUSED_STREAM so that upstream client can
// resend request.
if(downstream_error_code == NGHTTP2_REFUSED_STREAM) {
return SPDYLAY_REFUSED_STREAM;
} else {
return SPDYLAY_INTERNAL_ERROR;
}
}
} // namespace
SpdyUpstream::SpdyUpstream(uint16_t version, ClientHandler *handler)
: handler_(handler),
session_(nullptr),
recv_ign_window_size_(0)
{
//handler->set_bev_cb(spdy_readcb, 0, spdy_eventcb);
handler->set_upstream_timeouts(&get_config()->http2_upstream_read_timeout,
&get_config()->upstream_write_timeout);
spdylay_session_callbacks callbacks;
memset(&callbacks, 0, sizeof(callbacks));
callbacks.send_callback = send_callback;
callbacks.recv_callback = recv_callback;
callbacks.on_stream_close_callback = on_stream_close_callback;
callbacks.on_ctrl_recv_callback = on_ctrl_recv_callback;
callbacks.on_data_chunk_recv_callback = on_data_chunk_recv_callback;
callbacks.on_data_recv_callback = on_data_recv_callback;
callbacks.on_ctrl_not_send_callback = on_ctrl_not_send_callback;
callbacks.on_ctrl_recv_parse_error_callback =
on_ctrl_recv_parse_error_callback;
callbacks.on_unknown_ctrl_recv_callback = on_unknown_ctrl_recv_callback;
int rv;
rv = spdylay_session_server_new(&session_, version, &callbacks, this);
assert(rv == 0);
if(version >= SPDYLAY_PROTO_SPDY3) {
int val = 1;
flow_control_ = true;
initial_window_size_ = 1 << get_config()->http2_upstream_window_bits;
rv = spdylay_session_set_option(session_,
SPDYLAY_OPT_NO_AUTO_WINDOW_UPDATE, &val,
sizeof(val));
assert(rv == 0);
} else {
flow_control_ = false;
initial_window_size_ = 0;
}
// TODO Maybe call from outside?
spdylay_settings_entry entry[2];
entry[0].settings_id = SPDYLAY_SETTINGS_MAX_CONCURRENT_STREAMS;
entry[0].value = get_config()->http2_max_concurrent_streams;
entry[0].flags = SPDYLAY_ID_FLAG_SETTINGS_NONE;
entry[1].settings_id = SPDYLAY_SETTINGS_INITIAL_WINDOW_SIZE;
entry[1].value = initial_window_size_;
entry[1].flags = SPDYLAY_ID_FLAG_SETTINGS_NONE;
rv = spdylay_submit_settings
(session_, SPDYLAY_FLAG_SETTINGS_NONE,
entry, sizeof(entry)/sizeof(spdylay_settings_entry));
assert(rv == 0);
if(version >= SPDYLAY_PROTO_SPDY3_1 &&
get_config()->http2_upstream_connection_window_bits > 16) {
int32_t delta = (1 << get_config()->http2_upstream_connection_window_bits)
- SPDYLAY_INITIAL_WINDOW_SIZE;
rv = spdylay_submit_window_update(session_, 0, delta);
assert(rv == 0);
}
// TODO Maybe call from outside?
send();
}
SpdyUpstream::~SpdyUpstream()
{
spdylay_session_del(session_);
}
int SpdyUpstream::on_read()
{
int rv = 0;
rv = spdylay_session_recv(session_);
if(rv < 0) {
if(rv != SPDYLAY_ERR_EOF) {
ULOG(ERROR, this) << "spdylay_session_recv() returned error: "
<< spdylay_strerror(rv);
}
return rv;
}
return send();
}
int SpdyUpstream::on_write()
{
return send();
}
// After this function call, downstream may be deleted.
int SpdyUpstream::send()
{
int rv = 0;
uint8_t buf[16384];
sendbuf.reset(bufferevent_get_output(handler_->get_bev()), buf, sizeof(buf));
rv = spdylay_session_send(session_);
if(rv != 0) {
ULOG(ERROR, this) << "spdylay_session_send() returned error: "
<< spdylay_strerror(rv);
return rv;
}
rv = sendbuf.flush();
if(rv != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
if(spdylay_session_want_read(session_) == 0 &&
spdylay_session_want_write(session_) == 0 &&
handler_->get_outbuf_length() == 0) {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "No more read/write for this SPDY session";
}
return -1;
}
return 0;
}
int SpdyUpstream::on_event()
{
return 0;
}
ClientHandler* SpdyUpstream::get_client_handler() const
{
return handler_;
}
namespace {
void spdy_downstream_readcb(bufferevent *bev, void *ptr)
{
auto dconn = static_cast<DownstreamConnection*>(ptr);
auto downstream = dconn->get_downstream();
auto upstream = static_cast<SpdyUpstream*>(downstream->get_upstream());
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
// 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.
upstream->rst_stream(downstream, infer_upstream_rst_stream_status_code
(downstream->get_response_rst_stream_error_code()));
downstream->set_downstream_connection(nullptr);
delete dconn;
dconn = nullptr;
} else {
auto rv = downstream->on_read();
if(rv != 0) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "HTTP parser failure";
}
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
upstream->rst_stream(downstream, SPDYLAY_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(nullptr);
delete dconn;
dconn = nullptr;
}
}
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;
}
auto dconn = static_cast<DownstreamConnection*>(ptr);
auto downstream = dconn->get_downstream();
auto upstream = static_cast<SpdyUpstream*>(downstream->get_upstream());
upstream->resume_read(SHRPX_NO_BUFFER, downstream);
}
} // namespace
namespace {
void spdy_downstream_eventcb(bufferevent *bev, short events, void *ptr)
{
auto dconn = static_cast<DownstreamConnection*>(ptr);
auto downstream = dconn->get_downstream();
auto upstream = static_cast<SpdyUpstream*>(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;
}
return;
}
if(events & BEV_EVENT_EOF) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "EOF. stream_id=" << downstream->get_stream_id();
}
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
// If stream was closed already, we don't need to send reply at
// the first place. We can delete downstream.
upstream->remove_downstream(downstream);
delete downstream;
return;
}
// Delete downstream connection. If we don't delete it here, it
// will be pooled in on_stream_close_callback.
downstream->set_downstream_connection(nullptr);
delete dconn;
dconn = nullptr;
// downstream wil be deleted in on_stream_close_callback.
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
// Server may indicate the end of the request by EOF
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Downstream body was ended by EOF";
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
// For tunneled connection, MSG_COMPLETE signals
// 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) {
delete upstream->get_client_handler();
return;
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
}
if(upstream->send() != 0) {
delete upstream->get_client_handler();
return;
}
// At this point, downstream may be deleted.
return;
}
if(events & (BEV_EVENT_ERROR | BEV_EVENT_TIMEOUT)) {
if(LOG_ENABLED(INFO)) {
if(events & BEV_EVENT_ERROR) {
DCLOG(INFO, dconn) << "Downstream network error: "
<< evutil_socket_error_to_string
(EVUTIL_SOCKET_ERROR());
} else {
DCLOG(INFO, dconn) << "Timeout";
}
if(downstream->get_upgraded()) {
DCLOG(INFO, dconn) << "Note: this is tunnel connection";
}
}
if(downstream->get_request_state() == Downstream::STREAM_CLOSED) {
upstream->remove_downstream(downstream);
delete downstream;
return;
}
// Delete downstream connection. If we don't delete it here, it
// will be pooled in on_stream_close_callback.
downstream->set_downstream_connection(nullptr);
delete dconn;
dconn = nullptr;
if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
// For SSL tunneling, we issue RST_STREAM. For other types of
// stream, we don't have to do anything since response was
// complete.
if(downstream->get_upgraded()) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
}
} else {
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
} else {
unsigned int status;
if(events & BEV_EVENT_TIMEOUT) {
status = 504;
} else {
status = 502;
}
if(upstream->error_reply(downstream, status) != 0) {
delete upstream->get_client_handler();
return;
}
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
}
if(upstream->send() != 0) {
delete upstream->get_client_handler();
return;
}
// At this point, downstream may be deleted.
return;
}
}
} // namespace
int SpdyUpstream::rst_stream(Downstream *downstream, int status_code)
{
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "RST_STREAM stream_id="
<< downstream->get_stream_id();
}
int rv;
rv = spdylay_submit_rst_stream(session_, downstream->get_stream_id(),
status_code);
if(rv < SPDYLAY_ERR_FATAL) {
ULOG(FATAL, this) << "spdylay_submit_rst_stream() failed: "
<< spdylay_strerror(rv);
DIE();
}
return 0;
}
int SpdyUpstream::window_update(Downstream *downstream, int32_t delta)
{
int rv;
int32_t stream_id;
if(downstream) {
stream_id = downstream->get_stream_id();
} else {
stream_id = 0;
recv_ign_window_size_ = 0;
}
rv = spdylay_submit_window_update(session_, stream_id, delta);
if(rv < SPDYLAY_ERR_FATAL) {
ULOG(FATAL, this) << "spdylay_submit_window_update() failed: "
<< spdylay_strerror(rv);
DIE();
}
return 0;
}
namespace {
ssize_t spdy_data_read_callback(spdylay_session *session,
int32_t stream_id,
uint8_t *buf, size_t length,
int *eof,
spdylay_data_source *source,
void *user_data)
{
auto downstream = static_cast<Downstream*>(source->ptr);
auto upstream = static_cast<SpdyUpstream*>(downstream->get_upstream());
auto body = downstream->get_response_body_buf();
assert(body);
int nread = evbuffer_remove(body, buf, length);
if(nread == -1) {
ULOG(FATAL, upstream) << "evbuffer_remove() failed";
return SPDYLAY_ERR_CALLBACK_FAILURE;
}
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.
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "RST_STREAM to tunneled stream stream_id="
<< stream_id;
}
upstream->rst_stream(downstream, infer_upstream_rst_stream_status_code
(downstream->get_response_rst_stream_error_code()));
}
}
if(nread == 0 && *eof != 1) {
if(downstream->resume_read(SHRPX_NO_BUFFER) != 0) {
return SPDYLAY_ERR_CALLBACK_FAILURE;
}
return SPDYLAY_ERR_DEFERRED;
}
return nread;
}
} // namespace
int SpdyUpstream::error_reply(Downstream *downstream, unsigned int status_code)
{
int rv;
auto html = http::create_error_html(status_code);
downstream->init_response_body_buf();
auto body = downstream->get_response_body_buf();
rv = evbuffer_add(body, html.c_str(), html.size());
if(rv == -1) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
spdylay_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_string = http2::get_status_string(status_code);
const char *nv[] = {
":status", status_string.c_str(),
":version", "http/1.1",
"content-type", "text/html; charset=UTF-8",
"server", get_config()->server_name,
"content-length", content_length.c_str(),
nullptr
};
rv = spdylay_submit_response(session_, downstream->get_stream_id(), nv,
&data_prd);
if(rv < SPDYLAY_ERR_FATAL) {
ULOG(FATAL, this) << "spdylay_submit_response() failed: "
<< spdylay_strerror(rv);
DIE();
}
if(get_config()->accesslog) {
upstream_response(get_client_handler()->get_ipaddr(),
status_code, downstream);
}
return 0;
}
bufferevent_data_cb SpdyUpstream::get_downstream_readcb()
{
return spdy_downstream_readcb;
}
bufferevent_data_cb SpdyUpstream::get_downstream_writecb()
{
return spdy_downstream_writecb;
}
bufferevent_event_cb SpdyUpstream::get_downstream_eventcb()
{
return spdy_downstream_eventcb;
}
void SpdyUpstream::add_downstream(Downstream *downstream)
{
downstream_queue_.add(downstream);
}
void SpdyUpstream::remove_downstream(Downstream *downstream)
{
downstream_queue_.remove(downstream);
}
Downstream* SpdyUpstream::find_downstream(int32_t stream_id)
{
return downstream_queue_.find(stream_id);
}
spdylay_session* SpdyUpstream::get_http2_session()
{
return session_;
}
// WARNING: Never call directly or indirectly spdylay_session_send or
// spdylay_session_recv. These calls may delete downstream.
int SpdyUpstream::on_downstream_header_complete(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "HTTP response header completed";
}
downstream->normalize_response_headers();
if(!get_config()->http2_proxy && !get_config()->client_proxy) {
downstream->rewrite_norm_location_response_header
(get_client_handler()->get_upstream_scheme(), get_config()->port);
}
size_t nheader = downstream->get_response_headers().size();
// 6 means :status, :version and possible via header field.
auto nv = util::make_unique<const char*[]>
(nheader * 2 + 6 + get_config()->add_response_headers.size() * 2 + 1);
size_t hdidx = 0;
std::string via_value;
std::string status_string = http2::get_status_string
(downstream->get_response_http_status());
nv[hdidx++] = ":status";
nv[hdidx++] = status_string.c_str();
nv[hdidx++] = ":version";
nv[hdidx++] = "HTTP/1.1";
for(auto& hd : downstream->get_response_headers()) {
if(hd.name.empty() || hd.name.c_str()[0] == ':' ||
util::strieq(hd.name.c_str(), "transfer-encoding") ||
util::strieq(hd.name.c_str(), "keep-alive") || // HTTP/1.0?
util::strieq(hd.name.c_str(), "connection") ||
util::strieq(hd.name.c_str(), "proxy-connection")) {
// These are ignored
} else if(!get_config()->no_via &&
util::strieq(hd.name.c_str(), "via")) {
via_value = hd.value;
} else {
nv[hdidx++] = hd.name.c_str();
nv[hdidx++] = hd.value.c_str();
}
}
if(!get_config()->no_via) {
if(!via_value.empty()) {
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();
}
for(auto& p : get_config()->add_response_headers) {
nv[hdidx++] = p.first.c_str();
nv[hdidx++] = p.second.c_str();
}
nv[hdidx++] = 0;
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();
}
spdylay_data_provider data_prd;
data_prd.source.ptr = downstream;
data_prd.read_callback = spdy_data_read_callback;
int rv;
rv = spdylay_submit_response(session_, downstream->get_stream_id(), nv.get(),
&data_prd);
if(rv != 0) {
ULOG(FATAL, this) << "spdylay_submit_response() failed";
return -1;
}
if(get_config()->accesslog) {
upstream_response(get_client_handler()->get_ipaddr(),
downstream->get_response_http_status(),
downstream);
}
downstream->clear_response_headers();
return 0;
}
// WARNING: Never call directly or indirectly spdylay_session_send or
// spdylay_session_recv. These calls may delete downstream.
int SpdyUpstream::on_downstream_body(Downstream *downstream,
const uint8_t *data, size_t len,
bool flush)
{
auto body = downstream->get_response_body_buf();
int rv = evbuffer_add(body, data, len);
if(rv != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
if(flush) {
spdylay_session_resume_data(session_, downstream->get_stream_id());
}
if(evbuffer_get_length(body) >= INBUF_MAX_THRES) {
if(!flush) {
spdylay_session_resume_data(session_, downstream->get_stream_id());
}
downstream->pause_read(SHRPX_NO_BUFFER);
}
return 0;
}
// WARNING: Never call directly or indirectly spdylay_session_send or
// spdylay_session_recv. These calls may delete downstream.
int SpdyUpstream::on_downstream_body_complete(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "HTTP response completed";
}
spdylay_session_resume_data(session_, downstream->get_stream_id());
return 0;
}
bool SpdyUpstream::get_flow_control() const
{
return flow_control_;
}
void SpdyUpstream::pause_read(IOCtrlReason reason)
{}
namespace {
int32_t determine_window_update_transmission(spdylay_session *session,
int32_t stream_id)
{
int32_t recv_length, window_size;
if(stream_id == 0) {
recv_length = spdylay_session_get_recv_data_length(session);
window_size = 1 << get_config()->http2_upstream_connection_window_bits;
} else {
recv_length = spdylay_session_get_stream_recv_data_length
(session, stream_id);
window_size = 1 << get_config()->http2_upstream_window_bits;
}
if(recv_length != -1 && recv_length >= window_size / 2) {
return recv_length;
}
return -1;
}
} // namespace
int SpdyUpstream::resume_read(IOCtrlReason reason, Downstream *downstream)
{
if(get_flow_control()) {
int32_t delta;
delta = determine_window_update_transmission(session_, 0);
if(delta != -1) {
window_update(0, delta);
}
delta = determine_window_update_transmission
(session_, downstream->get_stream_id());
if(delta != -1) {
window_update(downstream, delta);
}
}
return send();
}
int SpdyUpstream::on_downstream_abort_request(Downstream *downstream,
unsigned int status_code)
{
int rv;
rv = error_reply(downstream, status_code);
if(rv != 0) {
return -1;
}
return send();
}
int SpdyUpstream::handle_ign_data_chunk(size_t len)
{
int32_t window_size;
if(spdylay_session_get_recv_data_length(session_) == -1) {
// No connection flow control
return 0;
}
window_size = 1 << get_config()->http2_upstream_connection_window_bits;
if(recv_ign_window_size_ >= window_size / 2) {
window_update(0, recv_ign_window_size_);
}
return 0;
}
} // namespace shrpx
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