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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"
#ifdef HAVE_MRUBY
#include "shrpx_mruby.h"
#endif // HAVE_MRUBY
#include "shrpx_worker.h"
#include "shrpx_http2_session.h"
#include "http2.h"
#include "util.h"
#include "template.h"
using namespace nghttp2;
namespace shrpx {
namespace {
constexpr size_t MAX_BUFFER_SIZE = 32_k;
} // namespace
namespace {
ssize_t send_callback(spdylay_session *session, const uint8_t *data, size_t len,
int flags, void *user_data) {
auto upstream = static_cast<SpdyUpstream *>(user_data);
auto wb = upstream->get_response_buf();
if (wb->rleft() >= MAX_BUFFER_SIZE) {
return SPDYLAY_ERR_WOULDBLOCK;
}
wb->append(data, len);
return len;
}
} // namespace
namespace {
ssize_t recv_callback(spdylay_session *session, uint8_t *buf, size_t len,
int flags, void *user_data) {
auto upstream = static_cast<SpdyUpstream *>(user_data);
auto handler = upstream->get_client_handler();
auto rb = handler->get_rb();
auto rlimit = handler->get_rlimit();
if (rb->rleft() == 0) {
return SPDYLAY_ERR_WOULDBLOCK;
}
auto nread = std::min(rb->rleft(), len);
memcpy(buf, rb->pos, nread);
rb->drain(nread);
rlimit->startw();
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 = static_cast<Downstream *>(
spdylay_session_get_stream_user_data(session, stream_id));
if (!downstream) {
return;
}
auto &req = downstream->request();
upstream->consume(stream_id, req.unconsumed_body_length);
req.unconsumed_body_length = 0;
if (downstream->get_request_state() == Downstream::CONNECT_FAIL) {
upstream->remove_downstream(downstream);
// downstrea was deleted
return;
}
if (downstream->can_detach_downstream_connection()) {
// Keep-alive
downstream->detach_downstream_connection();
}
downstream->set_request_state(Downstream::STREAM_CLOSED);
// At this point, downstream read may be paused.
// If shrpx_downstream::push_request_headers() failed, the
// error is handled here.
upstream->remove_downstream(downstream);
// downstrea was deleted
// 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 =
upstream->add_pending_downstream(frame->syn_stream.stream_id);
auto &req = downstream->request();
auto &balloc = downstream->get_block_allocator();
downstream->reset_upstream_rtimer();
auto nv = frame->syn_stream.nv;
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();
}
size_t num_headers = 0;
size_t header_buffer = 0;
for (size_t i = 0; nv[i]; i += 2) {
++num_headers;
// shut up scan-build
assert(nv[i + 1]);
header_buffer += strlen(nv[i]) + strlen(nv[i + 1]);
}
auto &httpconf = get_config()->http;
// spdy does not define usage of trailer fields, and we ignores
// them.
if (header_buffer > httpconf.request_header_field_buffer ||
num_headers > httpconf.max_request_header_fields) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
return;
}
for (size_t i = 0; nv[i]; i += 2) {
auto name = StringRef{nv[i]};
auto value = StringRef{nv[i + 1]};
auto token = http2::lookup_token(name.byte(), name.size());
req.fs.add_header_token(make_string_ref(balloc, StringRef{name}),
make_string_ref(balloc, StringRef{value}), false,
token);
}
if (req.fs.parse_content_length() != 0) {
if (upstream->error_reply(downstream, 400) != 0) {
ULOG(FATAL, upstream) << "error_reply failed";
}
return;
}
auto path = req.fs.header(http2::HD__PATH);
auto scheme = req.fs.header(http2::HD__SCHEME);
auto host = req.fs.header(http2::HD__HOST);
auto method = req.fs.header(http2::HD__METHOD);
if (!method) {
upstream->rst_stream(downstream, SPDYLAY_PROTOCOL_ERROR);
return;
}
auto method_token = http2::lookup_method_token(method->value);
if (method_token == -1) {
if (upstream->error_reply(downstream, 501) != 0) {
ULOG(FATAL, upstream) << "error_reply failed";
}
return;
}
auto is_connect = method_token == HTTP_CONNECT;
if (!path || !host || !http2::non_empty_value(host) ||
!http2::non_empty_value(path) ||
(!is_connect && (!scheme || !http2::non_empty_value(scheme)))) {
upstream->rst_stream(downstream, SPDYLAY_PROTOCOL_ERROR);
return;
}
if (std::find_if(std::begin(host->value), std::end(host->value),
[](char c) { return c == '"' || c == '\\'; }) !=
std::end(host->value)) {
if (upstream->error_reply(downstream, 400) != 0) {
ULOG(FATAL, upstream) << "error_reply failed";
}
return;
}
if (scheme) {
for (auto c : scheme->value) {
if (!(util::is_alpha(c) || util::is_digit(c) || c == '+' || c == '-' ||
c == '.')) {
if (upstream->error_reply(downstream, 400) != 0) {
ULOG(FATAL, upstream) << "error_reply failed";
}
return;
}
}
}
// For other than CONNECT method, path must start with "/", except
// for OPTIONS method, which can take "*" as path.
if (!is_connect && path->value[0] != '/' &&
(method_token != HTTP_OPTIONS || path->value != "*")) {
upstream->rst_stream(downstream, SPDYLAY_PROTOCOL_ERROR);
return;
}
req.method = method_token;
if (is_connect) {
req.authority = path->value;
} else {
req.scheme = scheme->value;
req.authority = host->value;
if (get_config()->http2_proxy) {
req.path = path->value;
} else if (method_token == HTTP_OPTIONS &&
path->value == StringRef::from_lit("*")) {
// Server-wide OPTIONS request. Path is empty.
} else {
req.path = http2::rewrite_clean_path(balloc, path->value);
}
}
if (!(frame->syn_stream.hd.flags & SPDYLAY_CTRL_FLAG_FIN)) {
req.http2_expect_body = true;
}
downstream->inspect_http2_request();
downstream->set_request_state(Downstream::HEADER_COMPLETE);
#ifdef HAVE_MRUBY
auto handler = upstream->get_client_handler();
auto worker = handler->get_worker();
auto mruby_ctx = worker->get_mruby_context();
if (mruby_ctx->run_on_request_proc(downstream) != 0) {
if (upstream->error_reply(downstream, 500) != 0) {
ULOG(FATAL, upstream) << "error_reply failed";
return;
}
return;
}
#endif // HAVE_MRUBY
if (frame->syn_stream.hd.flags & SPDYLAY_CTRL_FLAG_FIN) {
if (!downstream->validate_request_recv_body_length()) {
upstream->rst_stream(downstream, SPDYLAY_PROTOCOL_ERROR);
return;
}
downstream->disable_upstream_rtimer();
downstream->set_request_state(Downstream::MSG_COMPLETE);
}
if (downstream->get_response_state() == Downstream::MSG_COMPLETE) {
return;
}
upstream->start_downstream(downstream);
break;
}
default:
break;
}
}
} // namespace
void SpdyUpstream::start_downstream(Downstream *downstream) {
if (downstream_queue_.can_activate(downstream->request().authority)) {
initiate_downstream(downstream);
return;
}
downstream_queue_.mark_blocked(downstream);
}
void SpdyUpstream::initiate_downstream(Downstream *downstream) {
int rv;
auto dconn = handler_->get_downstream_connection(downstream);
if (!dconn ||
(rv = downstream->attach_downstream_connection(std::move(dconn))) != 0) {
// If downstream connection fails, issue RST_STREAM.
rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
downstream->set_request_state(Downstream::CONNECT_FAIL);
downstream_queue_.mark_failure(downstream);
return;
}
rv = downstream->push_request_headers();
if (rv != 0) {
rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
downstream_queue_.mark_failure(downstream);
return;
}
downstream_queue_.mark_active(downstream);
auto &req = downstream->request();
if (!req.http2_expect_body) {
if (downstream->end_upload_data() != 0) {
if (downstream->get_response_state() != Downstream::MSG_COMPLETE) {
rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
}
}
}
}
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 = static_cast<Downstream *>(
spdylay_session_get_stream_user_data(session, stream_id));
if (!downstream) {
upstream->consume(stream_id, len);
return;
}
downstream->reset_upstream_rtimer();
if (downstream->push_upload_data_chunk(data, len) != 0) {
if (downstream->get_response_state() != Downstream::MSG_COMPLETE) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
}
upstream->consume(stream_id, len);
return;
}
if (!upstream->get_flow_control()) {
return;
}
auto &http2conf = get_config()->http2;
// 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 << http2conf.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 << http2conf.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 << http2conf.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 << http2conf.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 = static_cast<Downstream *>(
spdylay_session_get_stream_user_data(session, stream_id));
if (downstream && (flags & SPDYLAY_DATA_FLAG_FIN)) {
if (!downstream->validate_request_recv_body_length()) {
upstream->rst_stream(downstream, SPDYLAY_PROTOCOL_ERROR);
return;
}
downstream->disable_upstream_rtimer();
if (downstream->end_upload_data() != 0) {
if (downstream->get_response_state() != Downstream::MSG_COMPLETE) {
upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
}
}
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);
if (LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "Failed to send control frame type=" << type
<< ", error_code=" << error_code << ":"
<< spdylay_strerror(error_code);
}
if (type == SPDYLAY_SYN_REPLY && error_code != SPDYLAY_ERR_STREAM_CLOSED &&
error_code != SPDYLAY_ERR_STREAM_CLOSING) {
// To avoid stream hanging around, issue RST_STREAM.
auto stream_id = frame->syn_reply.stream_id;
// TODO Could be always nullptr
auto downstream = static_cast<Downstream *>(
spdylay_session_get_stream_user_data(session, 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(uint32_t 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
namespace {
size_t downstream_queue_size(Worker *worker) {
auto &downstreamconf = *worker->get_downstream_config();
if (get_config()->http2_proxy) {
return downstreamconf.connections_per_host;
}
return downstreamconf.connections_per_frontend;
}
} // namespace
SpdyUpstream::SpdyUpstream(uint16_t version, ClientHandler *handler)
: wb_(handler->get_worker()->get_mcpool()),
downstream_queue_(downstream_queue_size(handler->get_worker()),
!get_config()->http2_proxy),
handler_(handler),
session_(nullptr) {
spdylay_session_callbacks 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);
uint32_t max_buffer = 64_k;
rv = spdylay_session_set_option(session_,
SPDYLAY_OPT_MAX_RECV_CTRL_FRAME_BUFFER,
&max_buffer, sizeof(max_buffer));
assert(rv == 0);
auto &http2conf = get_config()->http2;
auto faddr = handler_->get_upstream_addr();
// We use automatic WINDOW_UPDATE for API endpoints. Since SPDY is
// going to be deprecated in the future, and the default stream
// window is large enough for API request body (64KiB), we don't
// expand window size depending on the options.
if (version >= SPDYLAY_PROTO_SPDY3 && !faddr->alt_mode) {
int val = 1;
flow_control_ = true;
initial_window_size_ = 1 << http2conf.upstream.window_bits;
rv = spdylay_session_set_option(
session_, SPDYLAY_OPT_NO_AUTO_WINDOW_UPDATE2, &val, sizeof(val));
assert(rv == 0);
} else {
flow_control_ = false;
initial_window_size_ = 0;
}
// TODO Maybe call from outside?
std::array<spdylay_settings_entry, 2> entry;
size_t num_entry = 1;
entry[0].settings_id = SPDYLAY_SETTINGS_MAX_CONCURRENT_STREAMS;
entry[0].value = http2conf.upstream.max_concurrent_streams;
entry[0].flags = SPDYLAY_ID_FLAG_SETTINGS_NONE;
if (flow_control_) {
++num_entry;
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.data(), num_entry);
assert(rv == 0);
if (flow_control_ && version >= SPDYLAY_PROTO_SPDY3_1 &&
http2conf.upstream.connection_window_bits > 16) {
int32_t delta = (1 << http2conf.upstream.connection_window_bits) -
SPDYLAY_INITIAL_WINDOW_SIZE;
rv = spdylay_submit_window_update(session_, 0, delta);
assert(rv == 0);
}
handler_->reset_upstream_read_timeout(
get_config()->conn.upstream.timeout.http2_read);
handler_->signal_write();
}
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;
}
handler_->signal_write();
return 0;
}
// After this function call, downstream may be deleted.
int SpdyUpstream::on_write() {
int rv = 0;
if (wb_.rleft() >= MAX_BUFFER_SIZE) {
return 0;
}
rv = spdylay_session_send(session_);
if (rv != 0) {
ULOG(ERROR, this) << "spdylay_session_send() returned error: "
<< spdylay_strerror(rv);
return rv;
}
if (spdylay_session_want_read(session_) == 0 &&
spdylay_session_want_write(session_) == 0 && wb_.rleft() == 0) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "No more read/write for this SPDY session";
}
return -1;
}
return 0;
}
ClientHandler *SpdyUpstream::get_client_handler() const { return handler_; }
int SpdyUpstream::downstream_read(DownstreamConnection *dconn) {
auto downstream = dconn->get_downstream();
if (downstream->get_response_state() == Downstream::MSG_RESET) {
// The downstream stream was reset (canceled). In this case,
// RST_STREAM to the upstream and delete downstream connection
// here. Deleting downstream will be taken place at
// on_stream_close_callback.
rst_stream(downstream,
infer_upstream_rst_stream_status_code(
downstream->get_response_rst_stream_error_code()));
downstream->pop_downstream_connection();
dconn = nullptr;
} else if (downstream->get_response_state() == Downstream::MSG_BAD_HEADER) {
if (error_reply(downstream, 502) != 0) {
return -1;
}
downstream->pop_downstream_connection();
// dconn was deleted
dconn = nullptr;
} else {
auto rv = downstream->on_read();
if (rv == SHRPX_ERR_EOF) {
return downstream_eof(dconn);
}
if (rv == SHRPX_ERR_DCONN_CANCELED) {
downstream->pop_downstream_connection();
handler_->signal_write();
return 0;
}
if (rv != 0) {
if (rv != SHRPX_ERR_NETWORK) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "HTTP parser failure";
}
}
return downstream_error(dconn, Downstream::EVENT_ERROR);
}
if (downstream->can_detach_downstream_connection()) {
// Keep-alive
downstream->detach_downstream_connection();
}
}
handler_->signal_write();
// At this point, downstream may be deleted.
return 0;
}
int SpdyUpstream::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 SpdyUpstream::downstream_eof(DownstreamConnection *dconn) {
auto downstream = dconn->get_downstream();
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "EOF. stream_id=" << downstream->get_stream_id();
}
// Delete downstream connection. If we don't delete it here, it will
// be pooled in on_stream_close_callback.
downstream->pop_downstream_connection();
// dconn was deleted
dconn = nullptr;
// downstream wil be deleted in on_stream_close_callback.
if (downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
// Server may indicate the end of the request by EOF
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "Downstream body was ended by EOF";
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
// For tunneled connection, MSG_COMPLETE signals
// downstream_data_read_callback to send RST_STREAM after pending
// response body is sent. This is needed to ensure that RST_STREAM
// is sent after all pending data are sent.
on_downstream_body_complete(downstream);
} else if (downstream->get_response_state() != Downstream::MSG_COMPLETE) {
// If stream was not closed, then we set MSG_COMPLETE and let
// on_stream_close_callback delete downstream.
if (error_reply(downstream, 502) != 0) {
return -1;
}
}
handler_->signal_write();
// At this point, downstream may be deleted.
return 0;
}
int SpdyUpstream::downstream_error(DownstreamConnection *dconn, int events) {
auto downstream = dconn->get_downstream();
if (LOG_ENABLED(INFO)) {
if (events & Downstream::EVENT_ERROR) {
DCLOG(INFO, dconn) << "Downstream network/general error";
} else {
DCLOG(INFO, dconn) << "Timeout";
}
if (downstream->get_upgraded()) {
DCLOG(INFO, dconn) << "Note: this is tunnel connection";
}
}
// Delete downstream connection. If we don't delete it here, it will
// be pooled in on_stream_close_callback.
downstream->pop_downstream_connection();
// dconn was deleted
dconn = nullptr;
if (downstream->get_response_state() == Downstream::MSG_COMPLETE) {
// For SSL tunneling, we issue RST_STREAM. For other types of
// stream, we don't have to do anything since response was
// complete.
if (downstream->get_upgraded()) {
// We want "NO_ERROR" error code but SPDY does not have such
// code for RST_STREAM.
rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
}
} else {
if (downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
if (downstream->get_upgraded()) {
on_downstream_body_complete(downstream);
} else {
rst_stream(downstream, SPDYLAY_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 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;
}
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_buf();
assert(body);
auto nread = body->remove(buf, length);
auto body_empty = body->rleft() == 0;
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 (body_empty) {
downstream->disable_upstream_wtimer();
} else {
downstream->reset_upstream_wtimer();
}
if (nread > 0 && downstream->resume_read(SHRPX_NO_BUFFER, nread) != 0) {
return SPDYLAY_ERR_CALLBACK_FAILURE;
}
if (nread == 0 && *eof != 1) {
return SPDYLAY_ERR_DEFERRED;
}
if (nread > 0) {
downstream->response_sent_body_length += nread;
}
return nread;
}
} // namespace
int SpdyUpstream::send_reply(Downstream *downstream, const uint8_t *body,
size_t bodylen) {
int rv;
spdylay_data_provider data_prd, *data_prd_ptr = nullptr;
if (bodylen) {
data_prd.source.ptr = downstream;
data_prd.read_callback = spdy_data_read_callback;
data_prd_ptr = &data_prd;
}
const auto &resp = downstream->response();
auto &balloc = downstream->get_block_allocator();
auto status_string = http2::get_status_string(balloc, resp.http_status);
const auto &headers = resp.fs.headers();
auto &httpconf = get_config()->http;
auto nva = std::vector<const char *>();
// 6 for :status, :version and server. 1 for last terminal nullptr.
nva.reserve(6 + headers.size() * 2 +
httpconf.add_response_headers.size() * 2 + 1);
nva.push_back(":status");
nva.push_back(status_string.c_str());
nva.push_back(":version");
nva.push_back("HTTP/1.1");
for (auto &kv : headers) {
if (kv.name.empty() || kv.name[0] == ':') {
continue;
}
switch (kv.token) {
case http2::HD_CONNECTION:
case http2::HD_KEEP_ALIVE:
case http2::HD_PROXY_CONNECTION:
case http2::HD_TRANSFER_ENCODING:
continue;
}
nva.push_back(kv.name.c_str());
nva.push_back(kv.value.c_str());
}
if (!resp.fs.header(http2::HD_SERVER)) {
nva.push_back("server");
nva.push_back(get_config()->http.server_name.c_str());
}
for (auto &p : httpconf.add_response_headers) {
nva.push_back(p.name.c_str());
nva.push_back(p.value.c_str());
}
nva.push_back(nullptr);
rv = spdylay_submit_response(session_, downstream->get_stream_id(),
nva.data(), data_prd_ptr);
if (rv < SPDYLAY_ERR_FATAL) {
ULOG(FATAL, this) << "spdylay_submit_response() failed: "
<< spdylay_strerror(rv);
return -1;
}
auto buf = downstream->get_response_buf();
buf->append(body, bodylen);
downstream->set_response_state(Downstream::MSG_COMPLETE);
return 0;
}
int SpdyUpstream::error_reply(Downstream *downstream,
unsigned int status_code) {
int rv;
auto &resp = downstream->response();
auto &balloc = downstream->get_block_allocator();
auto html = http::create_error_html(balloc, status_code);
resp.http_status = status_code;
auto body = downstream->get_response_buf();
body->append(html);
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;
auto lgconf = log_config();
lgconf->update_tstamp(std::chrono::system_clock::now());
auto content_length = util::make_string_ref_uint(balloc, html.size());
auto status_string = http2::get_status_string(balloc, status_code);
const char *nv[] = {":status", status_string.c_str(), ":version", "http/1.1",
"content-type", "text/html; charset=UTF-8", "server",
get_config()->http.server_name.c_str(), "content-length",
content_length.c_str(), "date",
lgconf->time_http_str.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);
return -1;
}
return 0;
}
Downstream *SpdyUpstream::add_pending_downstream(int32_t stream_id) {
auto downstream =
make_unique<Downstream>(this, handler_->get_mcpool(), stream_id);
spdylay_session_set_stream_user_data(session_, stream_id, downstream.get());
auto res = downstream.get();
downstream_queue_.add_pending(std::move(downstream));
handler_->stop_read_timer();
return res;
}
void SpdyUpstream::remove_downstream(Downstream *downstream) {
if (downstream->accesslog_ready()) {
handler_->write_accesslog(downstream);
}
spdylay_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);
}
if (downstream_queue_.get_downstreams() == nullptr) {
handler_->repeat_read_timer();
}
}
// 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) {
auto &resp = downstream->response();
if (downstream->get_non_final_response()) {
// SPDY does not support non-final response. We could send it
// with HEADERS and final response in SYN_REPLY, but it is not
// official way.
resp.fs.clear_headers();
return 0;
}
const auto &req = downstream->request();
auto &balloc = downstream->get_block_allocator();
#ifdef HAVE_MRUBY
auto worker = handler_->get_worker();
auto mruby_ctx = worker->get_mruby_context();
if (mruby_ctx->run_on_response_proc(downstream) != 0) {
if (error_reply(downstream, 500) != 0) {
return -1;
}
// Returning -1 will signal deletion of dconn.
return -1;
}
if (downstream->get_response_state() == Downstream::MSG_COMPLETE) {
return -1;
}
#endif // HAVE_MRUBY
if (LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "HTTP response header completed";
}
auto &httpconf = get_config()->http;
if (!get_config()->http2_proxy && !httpconf.no_location_rewrite) {
downstream->rewrite_location_response_header(req.scheme);
}
// 8 means server, :status, :version and possible via header field.
auto nv =
make_unique<const char *[]>(resp.fs.headers().size() * 2 + 8 +
httpconf.add_response_headers.size() * 2 + 1);
size_t hdidx = 0;
std::string via_value;
auto status_string = http2::get_status_string(balloc, resp.http_status);
nv[hdidx++] = ":status";
nv[hdidx++] = status_string.c_str();
nv[hdidx++] = ":version";
nv[hdidx++] = "HTTP/1.1";
for (auto &hd : resp.fs.headers()) {
if (hd.name.empty() || hd.name.c_str()[0] == ':') {
continue;
}
switch (hd.token) {
case http2::HD_CONNECTION:
case http2::HD_KEEP_ALIVE:
case http2::HD_PROXY_CONNECTION:
case http2::HD_TRANSFER_ENCODING:
case http2::HD_VIA:
case http2::HD_SERVER:
continue;
}
nv[hdidx++] = hd.name.c_str();
nv[hdidx++] = hd.value.c_str();
}
if (!get_config()->http2_proxy) {
nv[hdidx++] = "server";
nv[hdidx++] = httpconf.server_name.c_str();
} else {
auto server = resp.fs.header(http2::HD_SERVER);
if (server) {
nv[hdidx++] = "server";
nv[hdidx++] = server->value.c_str();
}
}
auto via = resp.fs.header(http2::HD_VIA);
if (httpconf.no_via) {
if (via) {
nv[hdidx++] = "via";
nv[hdidx++] = via->value.c_str();
}
} else {
if (via) {
via_value = via->value.str();
via_value += ", ";
}
std::array<char, 16> viabuf;
auto end = http::create_via_header_value(std::begin(viabuf),
resp.http_major, resp.http_minor);
via_value.append(std::begin(viabuf), end);
nv[hdidx++] = "via";
nv[hdidx++] = via_value.c_str();
}
for (auto &p : httpconf.add_response_headers) {
nv[hdidx++] = p.name.c_str();
nv[hdidx++] = p.value.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;
}
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_buf();
body->append(data, len);
if (flush) {
spdylay_session_resume_data(session_, downstream->get_stream_id());
downstream->ensure_upstream_wtimer();
}
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";
}
auto &resp = downstream->response();
if (!downstream->validate_response_recv_body_length()) {
rst_stream(downstream, SPDYLAY_PROTOCOL_ERROR);
resp.connection_close = true;
return 0;
}
spdylay_session_resume_data(session_, downstream->get_stream_id());
downstream->ensure_upstream_wtimer();
return 0;
}
bool SpdyUpstream::get_flow_control() const { return flow_control_; }
void SpdyUpstream::pause_read(IOCtrlReason reason) {}
int SpdyUpstream::resume_read(IOCtrlReason reason, Downstream *downstream,
size_t consumed) {
if (get_flow_control()) {
if (consume(downstream->get_stream_id(), consumed) != 0) {
return -1;
}
auto &req = downstream->request();
req.consume(consumed);
}
handler_->signal_write();
return 0;
}
int SpdyUpstream::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 SpdyUpstream::consume(int32_t stream_id, size_t len) {
int rv;
if (!get_flow_control()) {
return 0;
}
rv = spdylay_session_consume(session_, stream_id, len);
if (rv != 0) {
ULOG(WARN, this) << "spdylay_session_consume() returned error: "
<< spdylay_strerror(rv);
return -1;
}
return 0;
}
int SpdyUpstream::on_timeout(Downstream *downstream) {
if (LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "Stream timeout stream_id="
<< downstream->get_stream_id();
}
rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
return 0;
}
void SpdyUpstream::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 SpdyUpstream::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) {
// This is error condition when we failed push_request_headers()
// in initiate_downstream(). Otherwise, we have
// Downstream::DISPATCH_ACTIVE state, or we did not set
// DownstreamConnection.
downstream->pop_downstream_connection();
continue;
}
if (!downstream->request_submission_ready()) {
rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);
downstream->pop_downstream_connection();
continue;
}
downstream->pop_downstream_connection();
downstream->add_retry();
std::unique_ptr<DownstreamConnection> dconn;
if (no_retry || downstream->no_more_retry()) {
goto fail;
}
// downstream connection is clean; we can retry with new
// downstream connection.
dconn = handler_->get_downstream_connection(downstream);
if (!dconn) {
goto fail;
}
rv = downstream->attach_downstream_connection(std::move(dconn));
if (rv != 0) {
goto fail;
}
rv = downstream->push_request_headers();
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 SpdyUpstream::initiate_push(Downstream *downstream, const StringRef &uri) {
return 0;
}
int SpdyUpstream::response_riovec(struct iovec *iov, int iovcnt) const {
if (iovcnt == 0 || wb_.rleft() == 0) {
return 0;
}
return wb_.riovec(iov, iovcnt);
}
void SpdyUpstream::response_drain(size_t n) { wb_.drain(n); }
bool SpdyUpstream::response_empty() const { return wb_.rleft() == 0; }
DefaultMemchunks *SpdyUpstream::get_response_buf() { return &wb_; }
Downstream *
SpdyUpstream::on_downstream_push_promise(Downstream *downstream,
int32_t promised_stream_id) {
return nullptr;
}
int SpdyUpstream::on_downstream_push_promise_complete(
Downstream *downstream, Downstream *promised_downstream) {
return -1;
}
bool SpdyUpstream::push_enabled() const { return false; }
void SpdyUpstream::cancel_premature_downstream(
Downstream *promised_downstream) {}
} // namespace shrpx
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